app/src/main/java/net/ktnx/mobileledger/ui/new_transaction/NewTransactionModel.java

   1 /*
   2  * Copyright © 2022 Damyan Ivanov.
   3  * This file is part of MoLe.
   4  * MoLe is free software: you can distribute it and/or modify it
   5  * under the term of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your opinion), any later version.
   8  *
   9  * MoLe is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License terms for details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with MoLe. If not, see <https://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.ktnx.mobileledger.ui.new_transaction;
  19
  20 import android.annotation.SuppressLint;
  21 import android.os.Build;
  22 import android.text.TextUtils;
  23
  24 import androidx.annotation.NonNull;
  25 import androidx.annotation.Nullable;
  26 import androidx.lifecycle.LifecycleOwner;
  27 import androidx.lifecycle.LiveData;
  28 import androidx.lifecycle.MutableLiveData;
  29 import androidx.lifecycle.Observer;
  30 import androidx.lifecycle.ViewModel;
  31
  32 import net.ktnx.mobileledger.BuildConfig;
  33 import net.ktnx.mobileledger.db.Currency;
  34 import net.ktnx.mobileledger.db.DB;
  35 import net.ktnx.mobileledger.db.Profile;
  36 import net.ktnx.mobileledger.db.TemplateAccount;
  37 import net.ktnx.mobileledger.db.TemplateHeader;
  38 import net.ktnx.mobileledger.db.TransactionWithAccounts;
  39 import net.ktnx.mobileledger.model.Data;
  40 import net.ktnx.mobileledger.model.InertMutableLiveData;
  41 import net.ktnx.mobileledger.model.LedgerTransaction;
  42 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  43 import net.ktnx.mobileledger.model.MatchedTemplate;
  44 import net.ktnx.mobileledger.utils.Globals;
  45 import net.ktnx.mobileledger.utils.Logger;
  46 import net.ktnx.mobileledger.utils.Misc;
  47 import net.ktnx.mobileledger.utils.SimpleDate;
  48
  49 import org.jetbrains.annotations.NotNull;
  50
  51 import java.text.ParseException;
  52 import java.util.ArrayList;
  53 import java.util.Calendar;
  54 import java.util.GregorianCalendar;
  55 import java.util.HashMap;
  56 import java.util.List;
  57 import java.util.Locale;
  58 import java.util.Objects;
  59 import java.util.Set;
  60 import java.util.concurrent.atomic.AtomicInteger;
  61 import java.util.regex.MatchResult;
  62
  63 enum ItemType {generalData, transactionRow}
  64
  65 enum FocusedElement {Account, Comment, Amount, Description, TransactionComment}
  66
  67
  68 public class NewTransactionModel extends ViewModel {
  69     private static final int MIN_ITEMS = 3;
  70     private final MutableLiveData<Boolean> showCurrency = new MutableLiveData<>(false);
  71     private final MutableLiveData<Boolean> isSubmittable = new InertMutableLiveData<>(false);
  72     private final MutableLiveData<Boolean> showComments = new MutableLiveData<>(true);
  73     private final MutableLiveData<List<Item>> items = new MutableLiveData<>();
  74     private final MutableLiveData<Boolean> simulateSave = new InertMutableLiveData<>(false);
  75     private final AtomicInteger busyCounter = new AtomicInteger(0);
  76     private final MutableLiveData<Boolean> busyFlag = new InertMutableLiveData<>(false);
  77     private final Observer<Profile> profileObserver = profile -> {
  78         if (profile != null) {
  79             showCurrency.postValue(profile.getShowCommodityByDefault());
  80             showComments.postValue(profile.getShowCommentsByDefault());
  81         }
  82     };
  83     private final MutableLiveData<FocusInfo> focusInfo = new MutableLiveData<>();
  84     private boolean observingDataProfile;
  85     public NewTransactionModel() {
  86     }
  87     public LiveData<Boolean> getShowCurrency() {
  88         return showCurrency;
  89     }
  90     public LiveData<List<Item>> getItems() {
  91         return items;
  92     }
  93     private void setItems(@NonNull List<Item> newList) {
  94         checkTransactionSubmittable(newList);
  95         setItemsWithoutSubmittableChecks(newList);
  96     }
  97     private void replaceItems(@NonNull List<Item> newList) {
  98         renumberItems();
  99
 100         setItems(newList);
 101     }
 102     /**
 103      * make old items replaceable in-place. makes the new values visually blend in
 104      */
 105     private void renumberItems() {
 106         renumberItems(items.getValue());
 107     }
 108     private void renumberItems(List<Item> list) {
 109         if (list == null) {
 110             return;
 111         }
 112
 113         int id = 0;
 114         for (Item item : list)
 115             item.id = id++;
 116     }
 117     private void setItemsWithoutSubmittableChecks(@NonNull List<Item> list) {
 118         final int cnt = list.size();
 119         for (int i = 1; i < cnt - 1; i++) {
 120             final TransactionAccount item = list.get(i)
 121                                                 .toTransactionAccount();
 122             if (item.isLast) {
 123                 TransactionAccount replacement = new TransactionAccount(item);
 124                 replacement.isLast = false;
 125                 list.set(i, replacement);
 126             }
 127         }
 128         final TransactionAccount last = list.get(cnt - 1)
 129                                             .toTransactionAccount();
 130         if (!last.isLast) {
 131             TransactionAccount replacement = new TransactionAccount(last);
 132             replacement.isLast = true;
 133             list.set(cnt - 1, replacement);
 134         }
 135
 136         if (BuildConfig.DEBUG)
 137             dumpItemList("Before setValue()", list);
 138         items.setValue(list);
 139     }
 140     private List<Item> copyList() {
 141         List<Item> copy = new ArrayList<>();
 142         List<Item> oldList = items.getValue();
 143
 144         if (oldList != null)
 145             for (Item item : oldList) {
 146                 copy.add(Item.from(item));
 147             }
 148
 149         return copy;
 150     }
 151     private List<Item> copyListWithoutItem(int position) {
 152         List<Item> copy = new ArrayList<>();
 153         List<Item> oldList = items.getValue();
 154
 155         if (oldList != null) {
 156             int i = 0;
 157             for (Item item : oldList) {
 158                 if (i++ == position)
 159                     continue;
 160                 copy.add(Item.from(item));
 161             }
 162         }
 163
 164         return copy;
 165     }
 166     private List<Item> shallowCopyList() {
 167         return new ArrayList<>(Objects.requireNonNull(items.getValue()));
 168     }
 169     LiveData<Boolean> getShowComments() {
 170         return showComments;
 171     }
 172     void observeDataProfile(LifecycleOwner activity) {
 173         if (!observingDataProfile)
 174             Data.observeProfile(activity, profileObserver);
 175         observingDataProfile = true;
 176     }
 177     boolean getSimulateSaveFlag() {
 178         Boolean value = simulateSave.getValue();
 179         if (value == null)
 180             return false;
 181         return value;
 182     }
 183     LiveData<Boolean> getSimulateSave() {
 184         return simulateSave;
 185     }
 186     void toggleSimulateSave() {
 187         simulateSave.setValue(!getSimulateSaveFlag());
 188     }
 189     LiveData<Boolean> isSubmittable() {
 190         return this.isSubmittable;
 191     }
 192     void reset() {
 193         Logger.debug("new-trans", "Resetting model");
 194         List<Item> list = new ArrayList<>();
 195         Item.resetIdDispenser();
 196         list.add(new TransactionHead(""));
 197         final String defaultCurrency = Objects.requireNonNull(Data.getProfile())
 198                                               .getDefaultCommodity();
 199         list.add(new TransactionAccount("", defaultCurrency));
 200         list.add(new TransactionAccount("", defaultCurrency));
 201         noteFocusChanged(0, FocusedElement.Description);
 202         renumberItems();
 203         isSubmittable.setValue(false);
 204         setItemsWithoutSubmittableChecks(list);
 205     }
 206     boolean accountsInInitialState() {
 207         final List<Item> list = items.getValue();
 208
 209         if (list == null)
 210             return true;
 211
 212         for (Item item : list) {
 213             if (!(item instanceof TransactionAccount))
 214                 continue;
 215
 216             TransactionAccount accRow = (TransactionAccount) item;
 217             if (!accRow.isEmpty())
 218                 return false;
 219         }
 220
 221         return true;
 222     }
 223     void applyTemplate(MatchedTemplate matchedTemplate, String text) {
 224         SimpleDate transactionDate = null;
 225         final MatchResult matchResult = matchedTemplate.matchResult;
 226         final TemplateHeader templateHead = matchedTemplate.templateHead;
 227         {
 228             int day = extractIntFromMatches(matchResult, templateHead.getDateDayMatchGroup(),
 229                     templateHead.getDateDay());
 230             int month = extractIntFromMatches(matchResult, templateHead.getDateMonthMatchGroup(),
 231                     templateHead.getDateMonth());
 232             int year = extractIntFromMatches(matchResult, templateHead.getDateYearMatchGroup(),
 233                     templateHead.getDateYear());
 234
 235             if (year > 0 || month > 0 || day > 0) {
 236                 SimpleDate today = SimpleDate.today();
 237                 if (year <= 0)
 238                     year = today.year;
 239                 if (month <= 0)
 240                     month = today.month;
 241                 if (day <= 0)
 242                     day = today.day;
 243
 244                 transactionDate = new SimpleDate(year, month, day);
 245
 246                 Logger.debug("pattern", "setting transaction date to " + transactionDate);
 247             }
 248         }
 249
 250         List<Item> present = copyList();
 251
 252         TransactionHead head = new TransactionHead(present.get(0)
 253                                                           .toTransactionHead());
 254         if (transactionDate != null)
 255             head.setDate(transactionDate);
 256
 257         final String transactionDescription = extractStringFromMatches(matchResult,
 258                 templateHead.getTransactionDescriptionMatchGroup(),
 259                 templateHead.getTransactionDescription());
 260         if (Misc.emptyIsNull(transactionDescription) != null)
 261             head.setDescription(transactionDescription);
 262
 263         final String transactionComment = extractStringFromMatches(matchResult,
 264                 templateHead.getTransactionCommentMatchGroup(),
 265                 templateHead.getTransactionComment());
 266         if (Misc.emptyIsNull(transactionComment) != null)
 267             head.setComment(transactionComment);
 268
 269         List<Item> newItems = new ArrayList<>();
 270
 271         newItems.add(head);
 272
 273         for (int i = 1; i < present.size(); i++) {
 274             final TransactionAccount row = present.get(i)
 275                                                   .toTransactionAccount();
 276             if (!row.isEmpty())
 277                 newItems.add(new TransactionAccount(row));
 278         }
 279
 280         DB.get()
 281           .getTemplateDAO()
 282           .getTemplateWithAccountsAsync(templateHead.getId(), entry -> {
 283               int rowIndex = 0;
 284               final boolean accountsInInitialState = accountsInInitialState();
 285               for (TemplateAccount acc : entry.accounts) {
 286                   rowIndex++;
 287
 288                   String accountName =
 289                           extractStringFromMatches(matchResult, acc.getAccountNameMatchGroup(),
 290                                   acc.getAccountName());
 291                   String accountComment =
 292                           extractStringFromMatches(matchResult, acc.getAccountCommentMatchGroup(),
 293                                   acc.getAccountComment());
 294                   Float amount = extractFloatFromMatches(matchResult, acc.getAmountMatchGroup(),
 295                           acc.getAmount());
 296                   if (amount != null && acc.getNegateAmount() != null && acc.getNegateAmount())
 297                       amount = -amount;
 298
 299                   TransactionAccount accRow = new TransactionAccount(accountName);
 300                   accRow.setComment(accountComment);
 301                   if (amount != null)
 302                       accRow.setAmount(amount);
 303                   accRow.setCurrency(
 304                           extractCurrencyFromMatches(matchResult, acc.getCurrencyMatchGroup(),
 305                                   acc.getCurrencyObject()));
 306
 307                   newItems.add(accRow);
 308               }
 309
 310               renumberItems(newItems);
 311               Misc.onMainThread(() -> replaceItems(newItems));
 312           });
 313     }
 314     @NonNull
 315     private String extractCurrencyFromMatches(MatchResult m, Integer group, Currency literal) {
 316         return Misc.nullIsEmpty(
 317                 extractStringFromMatches(m, group, (literal == null) ? "" : literal.getName()));
 318     }
 319     private int extractIntFromMatches(MatchResult m, Integer group, Integer literal) {
 320         if (literal != null)
 321             return literal;
 322
 323         if (group != null) {
 324             int grp = group;
 325             if (grp > 0 && grp <= m.groupCount())
 326                 try {
 327                     return Integer.parseInt(m.group(grp));
 328                 }
 329                 catch (NumberFormatException e) {
 330                     Logger.debug("new-trans", "Error extracting matched number", e);
 331                 }
 332         }
 333
 334         return 0;
 335     }
 336     @Nullable
 337     private String extractStringFromMatches(MatchResult m, Integer group, String literal) {
 338         if (literal != null)
 339             return literal;
 340
 341         if (group != null) {
 342             int grp = group;
 343             if (grp > 0 && grp <= m.groupCount())
 344                 return m.group(grp);
 345         }
 346
 347         return null;
 348     }
 349     private Float extractFloatFromMatches(MatchResult m, Integer group, Float literal) {
 350         if (literal != null)
 351             return literal;
 352
 353         if (group != null) {
 354             int grp = group;
 355             if (grp > 0 && grp <= m.groupCount())
 356                 try {
 357                     return Float.valueOf(m.group(grp));
 358                 }
 359                 catch (NumberFormatException e) {
 360                     Logger.debug("new-trans", "Error extracting matched number", e);
 361                 }
 362         }
 363
 364         return null;
 365     }
 366     void removeItem(int pos) {
 367         Logger.debug("new-trans", String.format(Locale.US, "Removing item at position %d", pos));
 368         List<Item> newList = copyListWithoutItem(pos);
 369         final FocusInfo fi = focusInfo.getValue();
 370         if ((fi != null) && (pos < fi.position))
 371             noteFocusChanged(fi.position - 1, fi.element);
 372         setItems(newList);
 373     }
 374     void noteFocusChanged(int position, @Nullable FocusedElement element) {
 375         FocusInfo present = focusInfo.getValue();
 376         if (present == null || present.position != position || present.element != element)
 377             focusInfo.setValue(new FocusInfo(position, element));
 378     }
 379     public LiveData<FocusInfo> getFocusInfo() {
 380         return focusInfo;
 381     }
 382     void moveItem(int fromIndex, int toIndex) {
 383         List<Item> newList = shallowCopyList();
 384         Item item = newList.remove(fromIndex);
 385         newList.add(toIndex, item);
 386
 387         FocusInfo fi = focusInfo.getValue();
 388         if (fi != null && fi.position == fromIndex)
 389             noteFocusChanged(toIndex, fi.element);
 390
 391         items.setValue(newList); // same count, same submittable state
 392     }
 393     void moveItemLast(List<Item> list, int index) {
 394         /*   0
 395              1   <-- index
 396              2
 397              3   <-- desired position
 398                  (no bottom filler)
 399          */
 400         int itemCount = list.size();
 401
 402         if (index < itemCount - 1)
 403             list.add(list.remove(index));
 404     }
 405     void toggleCurrencyVisible() {
 406         final boolean newValue = !Objects.requireNonNull(showCurrency.getValue());
 407
 408         // remove currency from all items, or reset currency to the default
 409         // no need to clone the list, because the removal of the currency won't lead to
 410         // visual changes -- the currency fields will be hidden or reset to default anyway
 411         // still, there may be changes in the submittable state
 412         final List<Item> list = Objects.requireNonNull(this.items.getValue());
 413         final Profile profile = Objects.requireNonNull(Data.getProfile());
 414         for (int i = 1; i < list.size(); i++) {
 415             ((TransactionAccount) list.get(i)).setCurrency(
 416                     newValue ? profile.getDefaultCommodity() : "");
 417         }
 418         checkTransactionSubmittable(null);
 419         showCurrency.setValue(newValue);
 420     }
 421     void stopObservingBusyFlag(Observer<Boolean> observer) {
 422         busyFlag.removeObserver(observer);
 423     }
 424     void incrementBusyCounter() {
 425         int newValue = busyCounter.incrementAndGet();
 426         if (newValue == 1)
 427             busyFlag.postValue(true);
 428     }
 429     void decrementBusyCounter() {
 430         int newValue = busyCounter.decrementAndGet();
 431         if (newValue == 0)
 432             busyFlag.postValue(false);
 433     }
 434     public LiveData<Boolean> getBusyFlag() {
 435         return busyFlag;
 436     }
 437     public void toggleShowComments() {
 438         showComments.setValue(!Objects.requireNonNull(showComments.getValue()));
 439     }
 440     public LedgerTransaction constructLedgerTransaction() {
 441         List<Item> list = Objects.requireNonNull(items.getValue());
 442         TransactionHead head = list.get(0)
 443                                    .toTransactionHead();
 444         LedgerTransaction tr = head.asLedgerTransaction();
 445
 446         tr.setComment(head.getComment());
 447         HashMap<String, List<LedgerTransactionAccount>> emptyAmountAccounts = new HashMap<>();
 448         HashMap<String, Float> emptyAmountAccountBalance = new HashMap<>();
 449         for (int i = 1; i < list.size(); i++) {
 450             TransactionAccount item = list.get(i)
 451                                           .toTransactionAccount();
 452             String currency = item.getCurrency();
 453             LedgerTransactionAccount acc = new LedgerTransactionAccount(item.getAccountName()
 454                                                                             .trim(), currency);
 455             if (acc.getAccountName()
 456                    .isEmpty())
 457                 continue;
 458
 459             acc.setComment(item.getComment());
 460
 461             if (item.isAmountSet()) {
 462                 acc.setAmount(item.getAmount());
 463                 Float emptyCurrBalance = emptyAmountAccountBalance.get(currency);
 464                 if (emptyCurrBalance == null) {
 465                     emptyAmountAccountBalance.put(currency, item.getAmount());
 466                 }
 467                 else {
 468                     emptyAmountAccountBalance.put(currency, emptyCurrBalance + item.getAmount());
 469                 }
 470             }
 471             else {
 472                 List<LedgerTransactionAccount> emptyCurrAccounts =
 473                         emptyAmountAccounts.get(currency);
 474                 if (emptyCurrAccounts == null)
 475                     emptyAmountAccounts.put(currency, emptyCurrAccounts = new ArrayList<>());
 476                 emptyCurrAccounts.add(acc);
 477             }
 478
 479             tr.addAccount(acc);
 480         }
 481
 482         if (emptyAmountAccounts.size() > 0) {
 483             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
 484                 emptyAmountAccounts.forEach((currency, accounts) -> {
 485                     if (accounts.size() != 1)
 486                         throw new RuntimeException(String.format(Locale.US,
 487                                 "Should not happen: approved transaction has %d accounts for " +
 488                                 "currency %s", accounts.size(), currency));
 489                     accounts.get(0)
 490                             .setAmount(-Objects.requireNonNull(
 491                                     emptyAmountAccountBalance.get(currency)));
 492                 });
 493             }
 494             else {
 495                 for (String currency : emptyAmountAccounts.keySet()) {
 496                     List<LedgerTransactionAccount> accounts =
 497                             Objects.requireNonNull(emptyAmountAccounts.get(currency));
 498
 499                     if (accounts.size() != 1)
 500                         throw new RuntimeException(String.format(Locale.US,
 501                                 "Should not happen: approved transaction has %d accounts for " +
 502                                 "currency %s", accounts.size(), currency));
 503                     accounts.get(0)
 504                             .setAmount(-Objects.requireNonNull(
 505                                     emptyAmountAccountBalance.get(currency)));
 506                 }
 507             }
 508         }
 509
 510         return tr;
 511     }
 512     void loadTransactionIntoModel(@NonNull TransactionWithAccounts tr) {
 513         List<Item> newList = new ArrayList<>();
 514         Item.resetIdDispenser();
 515
 516         Item currentHead = Objects.requireNonNull(items.getValue())
 517                                   .get(0);
 518         TransactionHead head = new TransactionHead(tr.transaction.getDescription());
 519         head.setComment(tr.transaction.getComment());
 520         if (currentHead instanceof TransactionHead)
 521             head.setDate(((TransactionHead) currentHead).date);
 522
 523         newList.add(head);
 524
 525         List<LedgerTransactionAccount> accounts = new ArrayList<>();
 526         for (net.ktnx.mobileledger.db.TransactionAccount acc : tr.accounts) {
 527             accounts.add(new LedgerTransactionAccount(acc));
 528         }
 529
 530         TransactionAccount firstNegative = null;
 531         TransactionAccount firstPositive = null;
 532         int singleNegativeIndex = -1;
 533         int singlePositiveIndex = -1;
 534         int negativeCount = 0;
 535         boolean hasCurrency = false;
 536         for (int i = 0; i < accounts.size(); i++) {
 537             LedgerTransactionAccount acc = accounts.get(i);
 538             TransactionAccount item = new TransactionAccount(acc.getAccountName(),
 539                     Misc.nullIsEmpty(acc.getCurrency()));
 540             newList.add(item);
 541
 542             item.setAccountName(acc.getAccountName());
 543             item.setComment(acc.getComment());
 544             if (acc.isAmountSet()) {
 545                 item.setAmount(acc.getAmount());
 546                 if (acc.getAmount() < 0) {
 547                     if (firstNegative == null) {
 548                         firstNegative = item;
 549                         singleNegativeIndex = i + 1;
 550                     }
 551                     else
 552                         singleNegativeIndex = -1;
 553                 }
 554                 else {
 555                     if (firstPositive == null) {
 556                         firstPositive = item;
 557                         singlePositiveIndex = i + 1;
 558                     }
 559                     else
 560                         singlePositiveIndex = -1;
 561                 }
 562             }
 563             else
 564                 item.resetAmount();
 565
 566             if (item.getCurrency()
 567                     .length() > 0)
 568                 hasCurrency = true;
 569         }
 570         if (BuildConfig.DEBUG)
 571             dumpItemList("Loaded previous transaction", newList);
 572
 573         if (singleNegativeIndex != -1) {
 574             firstNegative.resetAmount();
 575             moveItemLast(newList, singleNegativeIndex);
 576         }
 577         else if (singlePositiveIndex != -1) {
 578             firstPositive.resetAmount();
 579             moveItemLast(newList, singlePositiveIndex);
 580         }
 581
 582         final boolean foundTransactionHasCurrency = hasCurrency;
 583         Misc.onMainThread(() -> {
 584             setItems(newList);
 585             noteFocusChanged(1, FocusedElement.Amount);
 586             if (foundTransactionHasCurrency)
 587                 showCurrency.setValue(true);
 588         });
 589     }
 590     /**
 591      * A transaction is submittable if:
 592      * 0) has description
 593      * 1) has at least two account names
 594      * 2) each row with amount has account name
 595      * 3) for each commodity:
 596      * 3a) amounts must balance to 0, or
 597      * 3b) there must be exactly one empty amount (with account)
 598      * 4) empty accounts with empty amounts are ignored
 599      * Side effects:
 600      * 5) a row with an empty account name or empty amount is guaranteed to exist for each
 601      * commodity
 602      * 6) at least two rows need to be present in the ledger
 603      *
 604      * @param list - the item list to check. Can be the displayed list or a list that will be
 605      *             displayed soon
 606      */
 607     @SuppressLint("DefaultLocale")
 608     void checkTransactionSubmittable(@Nullable List<Item> list) {
 609         boolean workingWithLiveList = false;
 610         if (list == null) {
 611             list = copyList();
 612             workingWithLiveList = true;
 613         }
 614
 615         if (BuildConfig.DEBUG)
 616             dumpItemList(String.format("Before submittable checks (%s)",
 617                     workingWithLiveList ? "LIVE LIST" : "custom list"), list);
 618
 619         int accounts = 0;
 620         final BalanceForCurrency balance = new BalanceForCurrency();
 621         final String descriptionText = list.get(0)
 622                                            .toTransactionHead()
 623                                            .getDescription();
 624         boolean submittable = true;
 625         boolean listChanged = false;
 626         final ItemsForCurrency itemsForCurrency = new ItemsForCurrency();
 627         final ItemsForCurrency itemsWithEmptyAmountForCurrency = new ItemsForCurrency();
 628         final ItemsForCurrency itemsWithAccountAndEmptyAmountForCurrency = new ItemsForCurrency();
 629         final ItemsForCurrency itemsWithEmptyAccountForCurrency = new ItemsForCurrency();
 630         final ItemsForCurrency itemsWithAmountForCurrency = new ItemsForCurrency();
 631         final ItemsForCurrency itemsWithAccountForCurrency = new ItemsForCurrency();
 632         final ItemsForCurrency emptyRowsForCurrency = new ItemsForCurrency();
 633         final List<Item> emptyRows = new ArrayList<>();
 634
 635         try {
 636             if ((descriptionText == null) || descriptionText.trim()
 637                                                             .isEmpty())
 638             {
 639                 Logger.debug("submittable", "Transaction not submittable: missing description");
 640                 submittable = false;
 641             }
 642
 643             boolean hasInvalidAmount = false;
 644
 645             for (int i = 1; i < list.size(); i++) {
 646                 TransactionAccount item = list.get(i)
 647                                               .toTransactionAccount();
 648
 649                 String accName = item.getAccountName()
 650                                      .trim();
 651                 String currName = item.getCurrency();
 652
 653                 itemsForCurrency.add(currName, item);
 654
 655                 if (accName.isEmpty()) {
 656                     itemsWithEmptyAccountForCurrency.add(currName, item);
 657
 658                     if (item.isAmountSet()) {
 659                         // 2) each amount has account name
 660                         Logger.debug("submittable", String.format(
 661                                 "Transaction not submittable: row %d has no account name, but" +
 662                                 " has" + " amount %1.2f", i + 1, item.getAmount()));
 663                         submittable = false;
 664                     }
 665                     else {
 666                         emptyRowsForCurrency.add(currName, item);
 667                     }
 668                 }
 669                 else {
 670                     accounts++;
 671                     itemsWithAccountForCurrency.add(currName, item);
 672                 }
 673
 674                 if (item.isAmountSet() && item.isAmountValid()) {
 675                     itemsWithAmountForCurrency.add(currName, item);
 676                     balance.add(currName, item.getAmount());
 677                 }
 678                 else {
 679                     if (!item.isAmountValid()) {
 680                         Logger.debug("submittable",
 681                                 String.format("Not submittable: row %d has an invalid amount", i));
 682                         submittable = false;
 683                         hasInvalidAmount = true;
 684                     }
 685
 686                     itemsWithEmptyAmountForCurrency.add(currName, item);
 687
 688                     if (!accName.isEmpty())
 689                         itemsWithAccountAndEmptyAmountForCurrency.add(currName, item);
 690                 }
 691             }
 692
 693             // 1) has at least two account names
 694             if (accounts < 2) {
 695                 if (accounts == 0)
 696                     Logger.debug("submittable", "Transaction not submittable: no account names");
 697                 else if (accounts == 1)
 698                     Logger.debug("submittable",
 699                             "Transaction not submittable: only one account name");
 700                 else
 701                     Logger.debug("submittable",
 702                             String.format("Transaction not submittable: only %d account names",
 703                                     accounts));
 704                 submittable = false;
 705             }
 706
 707             // 3) for each commodity:
 708             // 3a) amount must balance to 0, or
 709             // 3b) there must be exactly one empty amount (with account)
 710             for (String balCurrency : itemsForCurrency.currencies()) {
 711                 float currencyBalance = balance.get(balCurrency);
 712                 if (Misc.isZero(currencyBalance)) {
 713                     // remove hints from all amount inputs in that currency
 714                     for (int i = 1; i < list.size(); i++) {
 715                         TransactionAccount acc = list.get(i)
 716                                                      .toTransactionAccount();
 717                         if (Misc.equalStrings(acc.getCurrency(), balCurrency)) {
 718                             if (BuildConfig.DEBUG)
 719                                 Logger.debug("submittable",
 720                                         String.format(Locale.US, "Resetting hint of %d:'%s' [%s]",
 721                                                 i, Misc.nullIsEmpty(acc.getAccountName()),
 722                                                 balCurrency));
 723                             // skip if the amount is set, in which case the hint is not
 724                             // important/visible
 725                             if (!acc.isAmountSet() && acc.amountHintIsSet &&
 726                                 !TextUtils.isEmpty(acc.getAmountHint()))
 727                             {
 728                                 acc.setAmountHint(null);
 729                                 listChanged = true;
 730                             }
 731                         }
 732                     }
 733                 }
 734                 else {
 735                     List<Item> tmpList =
 736                             itemsWithAccountAndEmptyAmountForCurrency.getList(balCurrency);
 737                     int balanceReceiversCount = tmpList.size();
 738                     if (balanceReceiversCount != 1) {
 739                         if (BuildConfig.DEBUG) {
 740                             if (balanceReceiversCount == 0)
 741                                 Logger.debug("submittable", String.format(
 742                                         "Transaction not submittable [curr:%s]: non-zero balance " +
 743                                         "with no empty amounts with accounts", balCurrency));
 744                             else
 745                                 Logger.debug("submittable", String.format(
 746                                         "Transaction not submittable [curr:%s]: non-zero balance " +
 747                                         "with multiple empty amounts with accounts", balCurrency));
 748                         }
 749                         submittable = false;
 750                     }
 751
 752                     List<Item> emptyAmountList =
 753                             itemsWithEmptyAmountForCurrency.getList(balCurrency);
 754
 755                     // suggest off-balance amount to a row and remove hints on other rows
 756                     Item receiver = null;
 757                     if (!tmpList.isEmpty())
 758                         receiver = tmpList.get(0);
 759                     else if (!emptyAmountList.isEmpty())
 760                         receiver = emptyAmountList.get(0);
 761
 762                     for (int i = 0; i < list.size(); i++) {
 763                         Item item = list.get(i);
 764                         if (!(item instanceof TransactionAccount))
 765                             continue;
 766
 767                         TransactionAccount acc = item.toTransactionAccount();
 768                         if (!Misc.equalStrings(acc.getCurrency(), balCurrency))
 769                             continue;
 770
 771                         if (item == receiver) {
 772                             final String hint = Data.formatNumber(-currencyBalance);
 773                             if (!acc.isAmountHintSet() ||
 774                                 !Misc.equalStrings(acc.getAmountHint(), hint))
 775                             {
 776                                 Logger.debug("submittable",
 777                                         String.format("Setting amount hint of {%s} to %s [%s]", acc,
 778                                                 hint, balCurrency));
 779                                 acc.setAmountHint(hint);
 780                                 listChanged = true;
 781                             }
 782                         }
 783                         else {
 784                             if (BuildConfig.DEBUG)
 785                                 Logger.debug("submittable",
 786                                         String.format("Resetting hint of '%s' [%s]",
 787                                                 Misc.nullIsEmpty(acc.getAccountName()),
 788                                                 balCurrency));
 789                             if (acc.amountHintIsSet && !TextUtils.isEmpty(acc.getAmountHint())) {
 790                                 acc.setAmountHint(null);
 791                                 listChanged = true;
 792                             }
 793                         }
 794                     }
 795                 }
 796             }
 797
 798             // 5) a row with an empty account name or empty amount is guaranteed to exist for
 799             // each commodity
 800             if (!hasInvalidAmount) {
 801                 for (String balCurrency : balance.currencies()) {
 802                     int currEmptyRows = itemsWithEmptyAccountForCurrency.size(balCurrency);
 803                     int currRows = itemsForCurrency.size(balCurrency);
 804                     int currAccounts = itemsWithAccountForCurrency.size(balCurrency);
 805                     int currAmounts = itemsWithAmountForCurrency.size(balCurrency);
 806                     if ((currEmptyRows == 0) &&
 807                         ((currRows == currAccounts) || (currRows == currAmounts)))
 808                     {
 809                         // perhaps there already is an unused empty row for another currency that
 810                         // is not used?
 811 //                        boolean foundIt = false;
 812 //                        for (Item item : emptyRows) {
 813 //                            Currency itemCurrency = item.getCurrency();
 814 //                            String itemCurrencyName =
 815 //                                    (itemCurrency == null) ? "" : itemCurrency.getName();
 816 //                            if (Misc.isZero(balance.get(itemCurrencyName))) {
 817 //                                item.setCurrency(Currency.loadByName(balCurrency));
 818 //                                item.setAmountHint(
 819 //                                        Data.formatNumber(-balance.get(balCurrency)));
 820 //                                foundIt = true;
 821 //                                break;
 822 //                            }
 823 //                        }
 824 //
 825 //                        if (!foundIt)
 826                         final TransactionAccount newAcc = new TransactionAccount("", balCurrency);
 827                         final float bal = balance.get(balCurrency);
 828                         if (!Misc.isZero(bal) && currAmounts == currRows)
 829                             newAcc.setAmountHint(Data.formatNumber(-bal));
 830                         Logger.debug("submittable",
 831                                 String.format("Adding new item with %s for currency %s",
 832                                         newAcc.getAmountHint(), balCurrency));
 833                         list.add(newAcc);
 834                         listChanged = true;
 835                     }
 836                 }
 837             }
 838
 839             // drop extra empty rows, not needed
 840             for (String currName : emptyRowsForCurrency.currencies()) {
 841                 List<Item> emptyItems = emptyRowsForCurrency.getList(currName);
 842                 while ((list.size() > MIN_ITEMS) && (emptyItems.size() > 1)) {
 843                     // the list is a copy, so the empty item is no longer present
 844                     Item itemToRemove = emptyItems.remove(1);
 845                     removeItemById(list, itemToRemove.id);
 846                     listChanged = true;
 847                 }
 848
 849                 // unused currency, remove last item (which is also an empty one)
 850                 if ((list.size() > MIN_ITEMS) && (emptyItems.size() == 1)) {
 851                     List<Item> currItems = itemsForCurrency.getList(currName);
 852
 853                     if (currItems.size() == 1) {
 854                         // the list is a copy, so the empty item is no longer present
 855                         removeItemById(list, emptyItems.get(0).id);
 856                         listChanged = true;
 857                     }
 858                 }
 859             }
 860
 861             // 6) at least two rows need to be present in the ledger
 862             //    (the list also contains header and trailer)
 863             while (list.size() < MIN_ITEMS) {
 864                 list.add(new TransactionAccount(""));
 865                 listChanged = true;
 866             }
 867
 868             Logger.debug("submittable", submittable ? "YES" : "NO");
 869             isSubmittable.setValue(submittable);
 870
 871             if (BuildConfig.DEBUG)
 872                 dumpItemList("After submittable checks", list);
 873         }
 874         catch (NumberFormatException e) {
 875             Logger.debug("submittable", "NO (because of NumberFormatException)");
 876             isSubmittable.setValue(false);
 877         }
 878         catch (Exception e) {
 879             e.printStackTrace();
 880             Logger.debug("submittable", "NO (because of an Exception)");
 881             isSubmittable.setValue(false);
 882         }
 883
 884         if (listChanged && workingWithLiveList) {
 885             setItemsWithoutSubmittableChecks(list);
 886         }
 887     }
 888     private void removeItemById(@NotNull List<Item> list, int id) {
 889         if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
 890             list.removeIf(item -> item.id == id);
 891         }
 892         else {
 893             for (Item item : list) {
 894                 if (item.id == id) {
 895                     list.remove(item);
 896                     break;
 897                 }
 898             }
 899         }
 900     }
 901     @SuppressLint("DefaultLocale")
 902     private void dumpItemList(@NotNull String msg, @NotNull List<Item> list) {
 903         Logger.debug("submittable", "== Dump of all items " + msg);
 904         for (int i = 1; i < list.size(); i++) {
 905             TransactionAccount item = list.get(i)
 906                                           .toTransactionAccount();
 907             Logger.debug("submittable", String.format("%d:%s", i, item.toString()));
 908         }
 909     }
 910     public void setItemCurrency(int position, String newCurrency) {
 911         TransactionAccount item = Objects.requireNonNull(items.getValue())
 912                                          .get(position)
 913                                          .toTransactionAccount();
 914         final String oldCurrency = item.getCurrency();
 915
 916         if (Misc.equalStrings(oldCurrency, newCurrency))
 917             return;
 918
 919         List<Item> newList = copyList();
 920         newList.get(position)
 921                .toTransactionAccount()
 922                .setCurrency(newCurrency);
 923
 924         setItems(newList);
 925     }
 926     public boolean accountListIsEmpty() {
 927         List<Item> items = Objects.requireNonNull(this.items.getValue());
 928
 929         for (Item item : items) {
 930             if (!(item instanceof TransactionAccount))
 931                 continue;
 932
 933             if (!((TransactionAccount) item).isEmpty())
 934                 return false;
 935         }
 936
 937         return true;
 938     }
 939
 940     public static class FocusInfo {
 941         int position;
 942         FocusedElement element;
 943         public FocusInfo(int position, @Nullable FocusedElement element) {
 944             this.position = position;
 945             this.element = element;
 946         }
 947     }
 948
 949     static abstract class Item {
 950         private static int idDispenser = 0;
 951         protected int id;
 952         private Item() {
 953             if (this instanceof TransactionHead)
 954                 id = 0;
 955             else
 956                 synchronized (Item.class) {
 957                     id = ++idDispenser;
 958                 }
 959         }
 960         public Item(int id) {
 961             this.id = id;
 962         }
 963         public static Item from(Item origin) {
 964             if (origin instanceof TransactionHead)
 965                 return new TransactionHead((TransactionHead) origin);
 966             if (origin instanceof TransactionAccount)
 967                 return new TransactionAccount((TransactionAccount) origin);
 968             throw new RuntimeException("Don't know how to handle " + origin);
 969         }
 970         private static void resetIdDispenser() {
 971             idDispenser = 0;
 972         }
 973         public int getId() {
 974             return id;
 975         }
 976         public abstract ItemType getType();
 977         public TransactionHead toTransactionHead() {
 978             if (this instanceof TransactionHead)
 979                 return (TransactionHead) this;
 980
 981             throw new IllegalStateException("Wrong item type " + this);
 982         }
 983         public TransactionAccount toTransactionAccount() {
 984             if (this instanceof TransactionAccount)
 985                 return (TransactionAccount) this;
 986
 987             throw new IllegalStateException("Wrong item type " + this);
 988         }
 989         public boolean equalContents(@Nullable Object item) {
 990             if (item == null)
 991                 return false;
 992
 993             if (!getClass().equals(item.getClass()))
 994                 return false;
 995
 996             // shortcut - comparing same instance
 997             if (item == this)
 998                 return true;
 999
1000             if (this instanceof TransactionHead)
1001                 return ((TransactionHead) item).equalContents((TransactionHead) this);
1002             if (this instanceof TransactionAccount)
1003                 return ((TransactionAccount) item).equalContents((TransactionAccount) this);
1004
1005             throw new RuntimeException("Don't know how to handle " + this);
1006         }
1007     }
1008
1009
1010 //==========================================================================================
1011
1012     public static class TransactionHead extends Item {
1013         private SimpleDate date;
1014         private String description;
1015         private String comment;
1016         TransactionHead(String description) {
1017             super();
1018             this.description = description;
1019         }
1020         public TransactionHead(TransactionHead origin) {
1021             super(origin.id);
1022             date = origin.date;
1023             description = origin.description;
1024             comment = origin.comment;
1025         }
1026         public SimpleDate getDate() {
1027             return date;
1028         }
1029         public void setDate(SimpleDate date) {
1030             this.date = date;
1031         }
1032         public void setDate(String text) throws ParseException {
1033             if (Misc.emptyIsNull(text) == null) {
1034                 date = null;
1035                 return;
1036             }
1037
1038             date = Globals.parseLedgerDate(text);
1039         }
1040         /**
1041          * getFormattedDate()
1042          *
1043          * @return nicely formatted, shortest available date representation
1044          */
1045         String getFormattedDate() {
1046             if (date == null)
1047                 return null;
1048
1049             Calendar today = GregorianCalendar.getInstance();
1050
1051             if (today.get(Calendar.YEAR) != date.year) {
1052                 return String.format(Locale.US, "%d/%02d/%02d", date.year, date.month, date.day);
1053             }
1054
1055             if (today.get(Calendar.MONTH) + 1 != date.month) {
1056                 return String.format(Locale.US, "%d/%02d", date.month, date.day);
1057             }
1058
1059             return String.valueOf(date.day);
1060         }
1061         @NonNull
1062         @Override
1063         public String toString() {
1064             @SuppressLint("DefaultLocale") StringBuilder b = new StringBuilder(
1065                     String.format("id:%d/%s", id, Integer.toHexString(hashCode())));
1066
1067             if (TextUtils.isEmpty(description))
1068                 b.append(" «no description»");
1069             else
1070                 b.append(String.format(" '%s'", description));
1071
1072             if (date != null)
1073                 b.append(String.format("@%s", date));
1074
1075             if (!TextUtils.isEmpty(comment))
1076                 b.append(String.format(" /%s/", comment));
1077
1078             return b.toString();
1079         }
1080         public String getDescription() {
1081             return description;
1082         }
1083         public void setDescription(String description) {
1084             this.description = description;
1085         }
1086         public String getComment() {
1087             return comment;
1088         }
1089         public void setComment(String comment) {
1090             this.comment = comment;
1091         }
1092         @Override
1093         public ItemType getType() {
1094             return ItemType.generalData;
1095         }
1096         public LedgerTransaction asLedgerTransaction() {
1097             return new LedgerTransaction(0, (date == null) ? SimpleDate.today() : date, description,
1098                     Objects.requireNonNull(Data.getProfile()));
1099         }
1100         public boolean equalContents(TransactionHead other) {
1101             if (other == null)
1102                 return false;
1103
1104             return Objects.equals(date, other.date) &&
1105                    Misc.equalStrings(description, other.description) &&
1106                    Misc.equalStrings(comment, other.comment);
1107         }
1108     }
1109
1110     public static class TransactionAccount extends Item {
1111         private String accountName;
1112         private String amountHint;
1113         private String comment;
1114         @NotNull
1115         private String currency = "";
1116         private float amount;
1117         private boolean amountSet;
1118         private boolean amountValid = true;
1119         @NotNull
1120         private String amountText = "";
1121         private FocusedElement focusedElement = FocusedElement.Account;
1122         private boolean amountHintIsSet = false;
1123         private boolean isLast = false;
1124         private int accountNameCursorPosition;
1125         public TransactionAccount(TransactionAccount origin) {
1126             super(origin.id);
1127             accountName = origin.accountName;
1128             amount = origin.amount;
1129             amountSet = origin.amountSet;
1130             amountHint = origin.amountHint;
1131             amountHintIsSet = origin.amountHintIsSet;
1132             amountText = origin.amountText;
1133             comment = origin.comment;
1134             currency = origin.currency;
1135             amountValid = origin.amountValid;
1136             focusedElement = origin.focusedElement;
1137             isLast = origin.isLast;
1138             accountNameCursorPosition = origin.accountNameCursorPosition;
1139         }
1140         public TransactionAccount(String accountName) {
1141             super();
1142             this.accountName = accountName;
1143         }
1144         public TransactionAccount(String accountName, @NotNull String currency) {
1145             super();
1146             this.accountName = accountName;
1147             this.currency = currency;
1148         }
1149         public @NotNull String getAmountText() {
1150             return amountText;
1151         }
1152         public void setAmountText(@NotNull String amountText) {
1153             this.amountText = amountText;
1154         }
1155         public boolean setAndCheckAmountText(@NotNull String amountText) {
1156             String amtText = amountText.trim();
1157             this.amountText = amtText;
1158
1159             boolean significantChange = false;
1160
1161             if (amtText.isEmpty()) {
1162                 if (amountSet) {
1163                     significantChange = true;
1164                 }
1165                 resetAmount();
1166             }
1167             else {
1168                 try {
1169                     amtText = amtText.replace(Data.getDecimalSeparator(), Data.decimalDot);
1170                     final float parsedAmount = Float.parseFloat(amtText);
1171                     if (!amountSet || !amountValid || !Misc.equalFloats(parsedAmount, amount))
1172                         significantChange = true;
1173                     amount = parsedAmount;
1174                     amountSet = true;
1175                     amountValid = true;
1176                 }
1177                 catch (NumberFormatException e) {
1178                     Logger.debug("new-trans", String.format(
1179                             "assuming amount is not set due to number format exception. " +
1180                             "input was '%s'", amtText));
1181                     if (amountValid) // it was valid and now it's not
1182                         significantChange = true;
1183                     amountValid = false;
1184                 }
1185             }
1186
1187             return significantChange;
1188         }
1189         public boolean isLast() {
1190             return isLast;
1191         }
1192         public boolean isAmountSet() {
1193             return amountSet;
1194         }
1195         public String getAccountName() {
1196             return accountName;
1197         }
1198         public void setAccountName(String accountName) {
1199             this.accountName = accountName;
1200         }
1201         public float getAmount() {
1202             if (!amountSet)
1203                 throw new IllegalStateException("Amount is not set");
1204             return amount;
1205         }
1206         public void setAmount(float amount) {
1207             this.amount = amount;
1208             amountSet = true;
1209             amountValid = true;
1210             amountText = Data.formatNumber(amount);
1211         }
1212         public void resetAmount() {
1213             amountSet = false;
1214             amountValid = true;
1215             amountText = "";
1216         }
1217         @Override
1218         public ItemType getType() {
1219             return ItemType.transactionRow;
1220         }
1221         public String getAmountHint() {
1222             return amountHint;
1223         }
1224         public void setAmountHint(String amountHint) {
1225             this.amountHint = amountHint;
1226             amountHintIsSet = !TextUtils.isEmpty(amountHint);
1227         }
1228         public String getComment() {
1229             return comment;
1230         }
1231         public void setComment(String comment) {
1232             this.comment = comment;
1233         }
1234         @NotNull
1235         public String getCurrency() {
1236             return currency;
1237         }
1238         public void setCurrency(@org.jetbrains.annotations.Nullable String currency) {
1239             this.currency = Misc.nullIsEmpty(currency);
1240         }
1241         public boolean isAmountValid() {
1242             return amountValid;
1243         }
1244         public void setAmountValid(boolean amountValid) {
1245             this.amountValid = amountValid;
1246         }
1247         public FocusedElement getFocusedElement() {
1248             return focusedElement;
1249         }
1250         public void setFocusedElement(FocusedElement focusedElement) {
1251             this.focusedElement = focusedElement;
1252         }
1253         public boolean isAmountHintSet() {
1254             return amountHintIsSet;
1255         }
1256         public void setAmountHintIsSet(boolean amountHintIsSet) {
1257             this.amountHintIsSet = amountHintIsSet;
1258         }
1259         public boolean isEmpty() {
1260             return !amountSet && Misc.emptyIsNull(accountName) == null &&
1261                    Misc.emptyIsNull(comment) == null;
1262         }
1263         @SuppressLint("DefaultLocale")
1264         @Override
1265         @NotNull
1266         public String toString() {
1267             StringBuilder b = new StringBuilder();
1268             b.append(String.format("id:%d/%s", id, Integer.toHexString(hashCode())));
1269             if (!TextUtils.isEmpty(accountName))
1270                 b.append(String.format(" acc'%s'", accountName));
1271
1272             if (amountSet)
1273                 b.append(amountText)
1274                  .append(" [")
1275                  .append(amountValid ? "valid" : "invalid")
1276                  .append("] ")
1277                  .append(String.format(Locale.ROOT, " {raw %4.2f}", amount));
1278             else if (amountHintIsSet)
1279                 b.append(String.format(" (hint %s)", amountHint));
1280
1281             if (!TextUtils.isEmpty(currency))
1282                 b.append(" ")
1283                  .append(currency);
1284
1285             if (!TextUtils.isEmpty(comment))
1286                 b.append(String.format(" /%s/", comment));
1287
1288             if (isLast)
1289                 b.append(" last");
1290
1291             return b.toString();
1292         }
1293         public boolean equalContents(TransactionAccount other) {
1294             if (other == null)
1295                 return false;
1296
1297             boolean equal = Misc.equalStrings(accountName, other.accountName);
1298             equal = equal && Misc.equalStrings(comment, other.comment) &&
1299                     (amountSet ? other.amountSet && amountValid == other.amountValid &&
1300                                  Misc.equalStrings(amountText, other.amountText)
1301                                : !other.amountSet);
1302
1303             // compare amount hint only if there is no amount
1304             if (!amountSet)
1305                 equal = equal && (amountHintIsSet ? other.amountHintIsSet &&
1306                                                     Misc.equalStrings(amountHint, other.amountHint)
1307                                                   : !other.amountHintIsSet);
1308             equal = equal && Misc.equalStrings(currency, other.currency) && isLast == other.isLast;
1309
1310             Logger.debug("new-trans",
1311                     String.format("Comparing {%s} and {%s}: %s", this, other, equal));
1312             return equal;
1313         }
1314         public int getAccountNameCursorPosition() {
1315             return accountNameCursorPosition;
1316         }
1317         public void setAccountNameCursorPosition(int position) {
1318             this.accountNameCursorPosition = position;
1319         }
1320     }
1321
1322     private static class BalanceForCurrency {
1323         private final HashMap<String, Float> hashMap = new HashMap<>();
1324         float get(String currencyName) {
1325             Float f = hashMap.get(currencyName);
1326             if (f == null) {
1327                 f = 0f;
1328                 hashMap.put(currencyName, f);
1329             }
1330             return f;
1331         }
1332         void add(String currencyName, float amount) {
1333             hashMap.put(currencyName, get(currencyName) + amount);
1334         }
1335         Set<String> currencies() {
1336             return hashMap.keySet();
1337         }
1338         boolean containsCurrency(String currencyName) {
1339             return hashMap.containsKey(currencyName);
1340         }
1341     }
1342
1343     private static class ItemsForCurrency {
1344         private final HashMap<@NotNull String, List<Item>> hashMap = new HashMap<>();
1345         @NonNull
1346         List<NewTransactionModel.Item> getList(@NotNull String currencyName) {
1347             List<NewTransactionModel.Item> list = hashMap.get(currencyName);
1348             if (list == null) {
1349                 list = new ArrayList<>();
1350                 hashMap.put(currencyName, list);
1351             }
1352             return list;
1353         }
1354         void add(@NotNull String currencyName, @NonNull NewTransactionModel.Item item) {
1355             getList(Objects.requireNonNull(currencyName)).add(item);
1356         }
1357         int size(@NotNull String currencyName) {
1358             return this.getList(Objects.requireNonNull(currencyName))
1359                        .size();
1360         }
1361         Set<String> currencies() {
1362             return hashMap.keySet();
1363         }
1364     }
1365 }