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(-emptyAmountAccountBalance.get(currency));
 491                 });
 492             }
 493             else {
 494                 for (String currency : emptyAmountAccounts.keySet()) {
 495                     List<LedgerTransactionAccount> accounts =
 496                             Objects.requireNonNull(emptyAmountAccounts.get(currency));
 497
 498                     if (accounts.size() != 1)
 499                         throw new RuntimeException(String.format(Locale.US,
 500                                 "Should not happen: approved transaction has %d accounts for " +
 501                                 "currency %s", accounts.size(), currency));
 502                     accounts.get(0)
 503                             .setAmount(-emptyAmountAccountBalance.get(currency));
 504                 }
 505             }
 506         }
 507
 508         return tr;
 509     }
 510     void loadTransactionIntoModel(@NonNull TransactionWithAccounts tr) {
 511         List<Item> newList = new ArrayList<>();
 512         Item.resetIdDispenser();
 513
 514         Item currentHead = Objects.requireNonNull(items.getValue())
 515                                   .get(0);
 516         TransactionHead head = new TransactionHead(tr.transaction.getDescription());
 517         head.setComment(tr.transaction.getComment());
 518         if (currentHead instanceof TransactionHead)
 519             head.setDate(((TransactionHead) currentHead).date);
 520
 521         newList.add(head);
 522
 523         List<LedgerTransactionAccount> accounts = new ArrayList<>();
 524         for (net.ktnx.mobileledger.db.TransactionAccount acc : tr.accounts) {
 525             accounts.add(new LedgerTransactionAccount(acc));
 526         }
 527
 528         TransactionAccount firstNegative = null;
 529         TransactionAccount firstPositive = null;
 530         int singleNegativeIndex = -1;
 531         int singlePositiveIndex = -1;
 532         int negativeCount = 0;
 533         boolean hasCurrency = false;
 534         for (int i = 0; i < accounts.size(); i++) {
 535             LedgerTransactionAccount acc = accounts.get(i);
 536             TransactionAccount item = new TransactionAccount(acc.getAccountName(),
 537                     Misc.nullIsEmpty(acc.getCurrency()));
 538             newList.add(item);
 539
 540             item.setAccountName(acc.getAccountName());
 541             item.setComment(acc.getComment());
 542             if (acc.isAmountSet()) {
 543                 item.setAmount(acc.getAmount());
 544                 if (acc.getAmount() < 0) {
 545                     if (firstNegative == null) {
 546                         firstNegative = item;
 547                         singleNegativeIndex = i + 1;
 548                     }
 549                     else
 550                         singleNegativeIndex = -1;
 551                 }
 552                 else {
 553                     if (firstPositive == null) {
 554                         firstPositive = item;
 555                         singlePositiveIndex = i + 1;
 556                     }
 557                     else
 558                         singlePositiveIndex = -1;
 559                 }
 560             }
 561             else
 562                 item.resetAmount();
 563
 564             if (item.getCurrency()
 565                     .length() > 0)
 566                 hasCurrency = true;
 567         }
 568         if (BuildConfig.DEBUG)
 569             dumpItemList("Loaded previous transaction", newList);
 570
 571         if (singleNegativeIndex != -1) {
 572             firstNegative.resetAmount();
 573             moveItemLast(newList, singleNegativeIndex);
 574         }
 575         else if (singlePositiveIndex != -1) {
 576             firstPositive.resetAmount();
 577             moveItemLast(newList, singlePositiveIndex);
 578         }
 579
 580         final boolean foundTransactionHasCurrency = hasCurrency;
 581         Misc.onMainThread(() -> {
 582             setItems(newList);
 583             noteFocusChanged(1, FocusedElement.Amount);
 584             if (foundTransactionHasCurrency)
 585                 showCurrency.setValue(true);
 586         });
 587     }
 588     /**
 589      * A transaction is submittable if:
 590      * 0) has description
 591      * 1) has at least two account names
 592      * 2) each row with amount has account name
 593      * 3) for each commodity:
 594      * 3a) amounts must balance to 0, or
 595      * 3b) there must be exactly one empty amount (with account)
 596      * 4) empty accounts with empty amounts are ignored
 597      * Side effects:
 598      * 5) a row with an empty account name or empty amount is guaranteed to exist for each
 599      * commodity
 600      * 6) at least two rows need to be present in the ledger
 601      *
 602      * @param list - the item list to check. Can be the displayed list or a list that will be
 603      *             displayed soon
 604      */
 605     @SuppressLint("DefaultLocale")
 606     void checkTransactionSubmittable(@Nullable List<Item> list) {
 607         boolean workingWithLiveList = false;
 608         if (list == null) {
 609             list = copyList();
 610             workingWithLiveList = true;
 611         }
 612
 613         if (BuildConfig.DEBUG)
 614             dumpItemList(String.format("Before submittable checks (%s)",
 615                     workingWithLiveList ? "LIVE LIST" : "custom list"), list);
 616
 617         int accounts = 0;
 618         final BalanceForCurrency balance = new BalanceForCurrency();
 619         final String descriptionText = list.get(0)
 620                                            .toTransactionHead()
 621                                            .getDescription();
 622         boolean submittable = true;
 623         boolean listChanged = false;
 624         final ItemsForCurrency itemsForCurrency = new ItemsForCurrency();
 625         final ItemsForCurrency itemsWithEmptyAmountForCurrency = new ItemsForCurrency();
 626         final ItemsForCurrency itemsWithAccountAndEmptyAmountForCurrency = new ItemsForCurrency();
 627         final ItemsForCurrency itemsWithEmptyAccountForCurrency = new ItemsForCurrency();
 628         final ItemsForCurrency itemsWithAmountForCurrency = new ItemsForCurrency();
 629         final ItemsForCurrency itemsWithAccountForCurrency = new ItemsForCurrency();
 630         final ItemsForCurrency emptyRowsForCurrency = new ItemsForCurrency();
 631         final List<Item> emptyRows = new ArrayList<>();
 632
 633         try {
 634             if ((descriptionText == null) || descriptionText.trim()
 635                                                             .isEmpty())
 636             {
 637                 Logger.debug("submittable", "Transaction not submittable: missing description");
 638                 submittable = false;
 639             }
 640
 641             boolean hasInvalidAmount = false;
 642
 643             for (int i = 1; i < list.size(); i++) {
 644                 TransactionAccount item = list.get(i)
 645                                               .toTransactionAccount();
 646
 647                 String accName = item.getAccountName()
 648                                      .trim();
 649                 String currName = item.getCurrency();
 650
 651                 itemsForCurrency.add(currName, item);
 652
 653                 if (accName.isEmpty()) {
 654                     itemsWithEmptyAccountForCurrency.add(currName, item);
 655
 656                     if (item.isAmountSet()) {
 657                         // 2) each amount has account name
 658                         Logger.debug("submittable", String.format(
 659                                 "Transaction not submittable: row %d has no account name, but" +
 660                                 " has" + " amount %1.2f", i + 1, item.getAmount()));
 661                         submittable = false;
 662                     }
 663                     else {
 664                         emptyRowsForCurrency.add(currName, item);
 665                     }
 666                 }
 667                 else {
 668                     accounts++;
 669                     itemsWithAccountForCurrency.add(currName, item);
 670                 }
 671
 672                 if (item.isAmountSet() && item.isAmountValid()) {
 673                     itemsWithAmountForCurrency.add(currName, item);
 674                     balance.add(currName, item.getAmount());
 675                 }
 676                 else {
 677                     if (!item.isAmountValid()) {
 678                         Logger.debug("submittable",
 679                                 String.format("Not submittable: row %d has an invalid amount", i));
 680                         submittable = false;
 681                         hasInvalidAmount = true;
 682                     }
 683
 684                     itemsWithEmptyAmountForCurrency.add(currName, item);
 685
 686                     if (!accName.isEmpty())
 687                         itemsWithAccountAndEmptyAmountForCurrency.add(currName, item);
 688                 }
 689             }
 690
 691             // 1) has at least two account names
 692             if (accounts < 2) {
 693                 if (accounts == 0)
 694                     Logger.debug("submittable", "Transaction not submittable: no account names");
 695                 else if (accounts == 1)
 696                     Logger.debug("submittable",
 697                             "Transaction not submittable: only one account name");
 698                 else
 699                     Logger.debug("submittable",
 700                             String.format("Transaction not submittable: only %d account names",
 701                                     accounts));
 702                 submittable = false;
 703             }
 704
 705             // 3) for each commodity:
 706             // 3a) amount must balance to 0, or
 707             // 3b) there must be exactly one empty amount (with account)
 708             for (String balCurrency : itemsForCurrency.currencies()) {
 709                 float currencyBalance = balance.get(balCurrency);
 710                 if (Misc.isZero(currencyBalance)) {
 711                     // remove hints from all amount inputs in that currency
 712                     for (int i = 1; i < list.size(); i++) {
 713                         TransactionAccount acc = list.get(i)
 714                                                      .toTransactionAccount();
 715                         if (Misc.equalStrings(acc.getCurrency(), balCurrency)) {
 716                             if (BuildConfig.DEBUG)
 717                                 Logger.debug("submittable",
 718                                         String.format(Locale.US, "Resetting hint of %d:'%s' [%s]",
 719                                                 i, Misc.nullIsEmpty(acc.getAccountName()),
 720                                                 balCurrency));
 721                             // skip if the amount is set, in which case the hint is not
 722                             // important/visible
 723                             if (!acc.isAmountSet() && acc.amountHintIsSet &&
 724                                 !TextUtils.isEmpty(acc.getAmountHint()))
 725                             {
 726                                 acc.setAmountHint(null);
 727                                 listChanged = true;
 728                             }
 729                         }
 730                     }
 731                 }
 732                 else {
 733                     List<Item> tmpList =
 734                             itemsWithAccountAndEmptyAmountForCurrency.getList(balCurrency);
 735                     int balanceReceiversCount = tmpList.size();
 736                     if (balanceReceiversCount != 1) {
 737                         if (BuildConfig.DEBUG) {
 738                             if (balanceReceiversCount == 0)
 739                                 Logger.debug("submittable", String.format(
 740                                         "Transaction not submittable [curr:%s]: non-zero balance " +
 741                                         "with no empty amounts with accounts", balCurrency));
 742                             else
 743                                 Logger.debug("submittable", String.format(
 744                                         "Transaction not submittable [curr:%s]: non-zero balance " +
 745                                         "with multiple empty amounts with accounts", balCurrency));
 746                         }
 747                         submittable = false;
 748                     }
 749
 750                     List<Item> emptyAmountList =
 751                             itemsWithEmptyAmountForCurrency.getList(balCurrency);
 752
 753                     // suggest off-balance amount to a row and remove hints on other rows
 754                     Item receiver = null;
 755                     if (!tmpList.isEmpty())
 756                         receiver = tmpList.get(0);
 757                     else if (!emptyAmountList.isEmpty())
 758                         receiver = emptyAmountList.get(0);
 759
 760                     for (int i = 0; i < list.size(); i++) {
 761                         Item item = list.get(i);
 762                         if (!(item instanceof TransactionAccount))
 763                             continue;
 764
 765                         TransactionAccount acc = item.toTransactionAccount();
 766                         if (!Misc.equalStrings(acc.getCurrency(), balCurrency))
 767                             continue;
 768
 769                         if (item == receiver) {
 770                             final String hint = Data.formatNumber(-currencyBalance);
 771                             if (!acc.isAmountHintSet() ||
 772                                 !Misc.equalStrings(acc.getAmountHint(), hint))
 773                             {
 774                                 Logger.debug("submittable",
 775                                         String.format("Setting amount hint of {%s} to %s [%s]", acc,
 776                                                 hint, balCurrency));
 777                                 acc.setAmountHint(hint);
 778                                 listChanged = true;
 779                             }
 780                         }
 781                         else {
 782                             if (BuildConfig.DEBUG)
 783                                 Logger.debug("submittable",
 784                                         String.format("Resetting hint of '%s' [%s]",
 785                                                 Misc.nullIsEmpty(acc.getAccountName()),
 786                                                 balCurrency));
 787                             if (acc.amountHintIsSet && !TextUtils.isEmpty(acc.getAmountHint())) {
 788                                 acc.setAmountHint(null);
 789                                 listChanged = true;
 790                             }
 791                         }
 792                     }
 793                 }
 794             }
 795
 796             // 5) a row with an empty account name or empty amount is guaranteed to exist for
 797             // each commodity
 798             if (!hasInvalidAmount) {
 799                 for (String balCurrency : balance.currencies()) {
 800                     int currEmptyRows = itemsWithEmptyAccountForCurrency.size(balCurrency);
 801                     int currRows = itemsForCurrency.size(balCurrency);
 802                     int currAccounts = itemsWithAccountForCurrency.size(balCurrency);
 803                     int currAmounts = itemsWithAmountForCurrency.size(balCurrency);
 804                     if ((currEmptyRows == 0) &&
 805                         ((currRows == currAccounts) || (currRows == currAmounts)))
 806                     {
 807                         // perhaps there already is an unused empty row for another currency that
 808                         // is not used?
 809 //                        boolean foundIt = false;
 810 //                        for (Item item : emptyRows) {
 811 //                            Currency itemCurrency = item.getCurrency();
 812 //                            String itemCurrencyName =
 813 //                                    (itemCurrency == null) ? "" : itemCurrency.getName();
 814 //                            if (Misc.isZero(balance.get(itemCurrencyName))) {
 815 //                                item.setCurrency(Currency.loadByName(balCurrency));
 816 //                                item.setAmountHint(
 817 //                                        Data.formatNumber(-balance.get(balCurrency)));
 818 //                                foundIt = true;
 819 //                                break;
 820 //                            }
 821 //                        }
 822 //
 823 //                        if (!foundIt)
 824                         final TransactionAccount newAcc = new TransactionAccount("", balCurrency);
 825                         final float bal = balance.get(balCurrency);
 826                         if (!Misc.isZero(bal) && currAmounts == currRows)
 827                             newAcc.setAmountHint(Data.formatNumber(-bal));
 828                         Logger.debug("submittable",
 829                                 String.format("Adding new item with %s for currency %s",
 830                                         newAcc.getAmountHint(), balCurrency));
 831                         list.add(newAcc);
 832                         listChanged = true;
 833                     }
 834                 }
 835             }
 836
 837             // drop extra empty rows, not needed
 838             for (String currName : emptyRowsForCurrency.currencies()) {
 839                 List<Item> emptyItems = emptyRowsForCurrency.getList(currName);
 840                 while ((list.size() > MIN_ITEMS) && (emptyItems.size() > 1)) {
 841                     // the list is a copy, so the empty item is no longer present
 842                     Item itemToRemove = emptyItems.remove(1);
 843                     removeItemById(list, itemToRemove.id);
 844                     listChanged = true;
 845                 }
 846
 847                 // unused currency, remove last item (which is also an empty one)
 848                 if ((list.size() > MIN_ITEMS) && (emptyItems.size() == 1)) {
 849                     List<Item> currItems = itemsForCurrency.getList(currName);
 850
 851                     if (currItems.size() == 1) {
 852                         // the list is a copy, so the empty item is no longer present
 853                         removeItemById(list, emptyItems.get(0).id);
 854                         listChanged = true;
 855                     }
 856                 }
 857             }
 858
 859             // 6) at least two rows need to be present in the ledger
 860             //    (the list also contains header and trailer)
 861             while (list.size() < MIN_ITEMS) {
 862                 list.add(new TransactionAccount(""));
 863                 listChanged = true;
 864             }
 865
 866             Logger.debug("submittable", submittable ? "YES" : "NO");
 867             isSubmittable.setValue(submittable);
 868
 869             if (BuildConfig.DEBUG)
 870                 dumpItemList("After submittable checks", list);
 871         }
 872         catch (NumberFormatException e) {
 873             Logger.debug("submittable", "NO (because of NumberFormatException)");
 874             isSubmittable.setValue(false);
 875         }
 876         catch (Exception e) {
 877             e.printStackTrace();
 878             Logger.debug("submittable", "NO (because of an Exception)");
 879             isSubmittable.setValue(false);
 880         }
 881
 882         if (listChanged && workingWithLiveList) {
 883             setItemsWithoutSubmittableChecks(list);
 884         }
 885     }
 886     private void removeItemById(@NotNull List<Item> list, int id) {
 887         if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
 888             list.removeIf(item -> item.id == id);
 889         }
 890         else {
 891             for (Item item : list) {
 892                 if (item.id == id) {
 893                     list.remove(item);
 894                     break;
 895                 }
 896             }
 897         }
 898     }
 899     @SuppressLint("DefaultLocale")
 900     private void dumpItemList(@NotNull String msg, @NotNull List<Item> list) {
 901         Logger.debug("submittable", "== Dump of all items " + msg);
 902         for (int i = 1; i < list.size(); i++) {
 903             TransactionAccount item = list.get(i)
 904                                           .toTransactionAccount();
 905             Logger.debug("submittable", String.format("%d:%s", i, item.toString()));
 906         }
 907     }
 908     public void setItemCurrency(int position, String newCurrency) {
 909         TransactionAccount item = Objects.requireNonNull(items.getValue())
 910                                          .get(position)
 911                                          .toTransactionAccount();
 912         final String oldCurrency = item.getCurrency();
 913
 914         if (Misc.equalStrings(oldCurrency, newCurrency))
 915             return;
 916
 917         List<Item> newList = copyList();
 918         newList.get(position)
 919                .toTransactionAccount()
 920                .setCurrency(newCurrency);
 921
 922         setItems(newList);
 923     }
 924     public boolean accountListIsEmpty() {
 925         List<Item> items = Objects.requireNonNull(this.items.getValue());
 926
 927         for (Item item : items) {
 928             if (!(item instanceof TransactionAccount))
 929                 continue;
 930
 931             if (!((TransactionAccount) item).isEmpty())
 932                 return false;
 933         }
 934
 935         return true;
 936     }
 937
 938     public static class FocusInfo {
 939         int position;
 940         FocusedElement element;
 941         public FocusInfo(int position, @Nullable FocusedElement element) {
 942             this.position = position;
 943             this.element = element;
 944         }
 945     }
 946
 947     static abstract class Item {
 948         private static int idDispenser = 0;
 949         protected int id;
 950         private Item() {
 951             if (this instanceof TransactionHead)
 952                 id = 0;
 953             else
 954                 synchronized (Item.class) {
 955                     id = ++idDispenser;
 956                 }
 957         }
 958         public Item(int id) {
 959             this.id = id;
 960         }
 961         public static Item from(Item origin) {
 962             if (origin instanceof TransactionHead)
 963                 return new TransactionHead((TransactionHead) origin);
 964             if (origin instanceof TransactionAccount)
 965                 return new TransactionAccount((TransactionAccount) origin);
 966             throw new RuntimeException("Don't know how to handle " + origin);
 967         }
 968         private static void resetIdDispenser() {
 969             idDispenser = 0;
 970         }
 971         public int getId() {
 972             return id;
 973         }
 974         public abstract ItemType getType();
 975         public TransactionHead toTransactionHead() {
 976             if (this instanceof TransactionHead)
 977                 return (TransactionHead) this;
 978
 979             throw new IllegalStateException("Wrong item type " + this);
 980         }
 981         public TransactionAccount toTransactionAccount() {
 982             if (this instanceof TransactionAccount)
 983                 return (TransactionAccount) this;
 984
 985             throw new IllegalStateException("Wrong item type " + this);
 986         }
 987         public boolean equalContents(@Nullable Object item) {
 988             if (item == null)
 989                 return false;
 990
 991             if (!getClass().equals(item.getClass()))
 992                 return false;
 993
 994             // shortcut - comparing same instance
 995             if (item == this)
 996                 return true;
 997
 998             if (this instanceof TransactionHead)
 999                 return ((TransactionHead) item).equalContents((TransactionHead) this);
1000             if (this instanceof TransactionAccount)
1001                 return ((TransactionAccount) item).equalContents((TransactionAccount) this);
1002
1003             throw new RuntimeException("Don't know how to handle " + this);
1004         }
1005     }
1006
1007
1008 //==========================================================================================
1009
1010     public static class TransactionHead extends Item {
1011         private SimpleDate date;
1012         private String description;
1013         private String comment;
1014         TransactionHead(String description) {
1015             super();
1016             this.description = description;
1017         }
1018         public TransactionHead(TransactionHead origin) {
1019             super(origin.id);
1020             date = origin.date;
1021             description = origin.description;
1022             comment = origin.comment;
1023         }
1024         public SimpleDate getDate() {
1025             return date;
1026         }
1027         public void setDate(SimpleDate date) {
1028             this.date = date;
1029         }
1030         public void setDate(String text) throws ParseException {
1031             if (Misc.emptyIsNull(text) == null) {
1032                 date = null;
1033                 return;
1034             }
1035
1036             date = Globals.parseLedgerDate(text);
1037         }
1038         /**
1039          * getFormattedDate()
1040          *
1041          * @return nicely formatted, shortest available date representation
1042          */
1043         String getFormattedDate() {
1044             if (date == null)
1045                 return null;
1046
1047             Calendar today = GregorianCalendar.getInstance();
1048
1049             if (today.get(Calendar.YEAR) != date.year) {
1050                 return String.format(Locale.US, "%d/%02d/%02d", date.year, date.month, date.day);
1051             }
1052
1053             if (today.get(Calendar.MONTH) + 1 != date.month) {
1054                 return String.format(Locale.US, "%d/%02d", date.month, date.day);
1055             }
1056
1057             return String.valueOf(date.day);
1058         }
1059         @NonNull
1060         @Override
1061         public String toString() {
1062             @SuppressLint("DefaultLocale") StringBuilder b = new StringBuilder(
1063                     String.format("id:%d/%s", id, Integer.toHexString(hashCode())));
1064
1065             if (TextUtils.isEmpty(description))
1066                 b.append(" «no description»");
1067             else
1068                 b.append(String.format(" '%s'", description));
1069
1070             if (date != null)
1071                 b.append(String.format("@%s", date));
1072
1073             if (!TextUtils.isEmpty(comment))
1074                 b.append(String.format(" /%s/", comment));
1075
1076             return b.toString();
1077         }
1078         public String getDescription() {
1079             return description;
1080         }
1081         public void setDescription(String description) {
1082             this.description = description;
1083         }
1084         public String getComment() {
1085             return comment;
1086         }
1087         public void setComment(String comment) {
1088             this.comment = comment;
1089         }
1090         @Override
1091         public ItemType getType() {
1092             return ItemType.generalData;
1093         }
1094         public LedgerTransaction asLedgerTransaction() {
1095             return new LedgerTransaction(0, (date == null) ? SimpleDate.today() : date, description,
1096                     Objects.requireNonNull(Data.getProfile()));
1097         }
1098         public boolean equalContents(TransactionHead other) {
1099             if (other == null)
1100                 return false;
1101
1102             return Objects.equals(date, other.date) &&
1103                    Misc.equalStrings(description, other.description) &&
1104                    Misc.equalStrings(comment, other.comment);
1105         }
1106     }
1107
1108     public static class TransactionAccount extends Item {
1109         private String accountName;
1110         private String amountHint;
1111         private String comment;
1112         @NotNull
1113         private String currency = "";
1114         private float amount;
1115         private boolean amountSet;
1116         private boolean amountValid = true;
1117         @NotNull
1118         private String amountText = "";
1119         private FocusedElement focusedElement = FocusedElement.Account;
1120         private boolean amountHintIsSet = false;
1121         private boolean isLast = false;
1122         private int accountNameCursorPosition;
1123         public TransactionAccount(TransactionAccount origin) {
1124             super(origin.id);
1125             accountName = origin.accountName;
1126             amount = origin.amount;
1127             amountSet = origin.amountSet;
1128             amountHint = origin.amountHint;
1129             amountHintIsSet = origin.amountHintIsSet;
1130             amountText = origin.amountText;
1131             comment = origin.comment;
1132             currency = origin.currency;
1133             amountValid = origin.amountValid;
1134             focusedElement = origin.focusedElement;
1135             isLast = origin.isLast;
1136             accountNameCursorPosition = origin.accountNameCursorPosition;
1137         }
1138         public TransactionAccount(String accountName) {
1139             super();
1140             this.accountName = accountName;
1141         }
1142         public TransactionAccount(String accountName, @NotNull String currency) {
1143             super();
1144             this.accountName = accountName;
1145             this.currency = currency;
1146         }
1147         public @NotNull String getAmountText() {
1148             return amountText;
1149         }
1150         public void setAmountText(@NotNull String amountText) {
1151             this.amountText = amountText;
1152         }
1153         public boolean setAndCheckAmountText(@NotNull String amountText) {
1154             String amtText = amountText.trim();
1155             this.amountText = amtText;
1156
1157             boolean significantChange = false;
1158
1159             if (amtText.isEmpty()) {
1160                 if (amountSet) {
1161                     significantChange = true;
1162                 }
1163                 resetAmount();
1164             }
1165             else {
1166                 try {
1167                     amtText = amtText.replace(Data.getDecimalSeparator(), Data.decimalDot);
1168                     final float parsedAmount = Float.parseFloat(amtText);
1169                     if (!amountSet || !amountValid || !Misc.equalFloats(parsedAmount, amount))
1170                         significantChange = true;
1171                     amount = parsedAmount;
1172                     amountSet = true;
1173                     amountValid = true;
1174                 }
1175                 catch (NumberFormatException e) {
1176                     Logger.debug("new-trans", String.format(
1177                             "assuming amount is not set due to number format exception. " +
1178                             "input was '%s'", amtText));
1179                     if (amountValid) // it was valid and now it's not
1180                         significantChange = true;
1181                     amountValid = false;
1182                 }
1183             }
1184
1185             return significantChange;
1186         }
1187         public boolean isLast() {
1188             return isLast;
1189         }
1190         public boolean isAmountSet() {
1191             return amountSet;
1192         }
1193         public String getAccountName() {
1194             return accountName;
1195         }
1196         public void setAccountName(String accountName) {
1197             this.accountName = accountName;
1198         }
1199         public float getAmount() {
1200             if (!amountSet)
1201                 throw new IllegalStateException("Amount is not set");
1202             return amount;
1203         }
1204         public void setAmount(float amount) {
1205             this.amount = amount;
1206             amountSet = true;
1207             amountValid = true;
1208             amountText = Data.formatNumber(amount);
1209         }
1210         public void resetAmount() {
1211             amountSet = false;
1212             amountValid = true;
1213             amountText = "";
1214         }
1215         @Override
1216         public ItemType getType() {
1217             return ItemType.transactionRow;
1218         }
1219         public String getAmountHint() {
1220             return amountHint;
1221         }
1222         public void setAmountHint(String amountHint) {
1223             this.amountHint = amountHint;
1224             amountHintIsSet = !TextUtils.isEmpty(amountHint);
1225         }
1226         public String getComment() {
1227             return comment;
1228         }
1229         public void setComment(String comment) {
1230             this.comment = comment;
1231         }
1232         @NotNull
1233         public String getCurrency() {
1234             return currency;
1235         }
1236         public void setCurrency(@org.jetbrains.annotations.Nullable String currency) {
1237             this.currency = Misc.nullIsEmpty(currency);
1238         }
1239         public boolean isAmountValid() {
1240             return amountValid;
1241         }
1242         public void setAmountValid(boolean amountValid) {
1243             this.amountValid = amountValid;
1244         }
1245         public FocusedElement getFocusedElement() {
1246             return focusedElement;
1247         }
1248         public void setFocusedElement(FocusedElement focusedElement) {
1249             this.focusedElement = focusedElement;
1250         }
1251         public boolean isAmountHintSet() {
1252             return amountHintIsSet;
1253         }
1254         public void setAmountHintIsSet(boolean amountHintIsSet) {
1255             this.amountHintIsSet = amountHintIsSet;
1256         }
1257         public boolean isEmpty() {
1258             return !amountSet && Misc.emptyIsNull(accountName) == null &&
1259                    Misc.emptyIsNull(comment) == null;
1260         }
1261         @SuppressLint("DefaultLocale")
1262         @Override
1263         @NotNull
1264         public String toString() {
1265             StringBuilder b = new StringBuilder();
1266             b.append(String.format("id:%d/%s", id, Integer.toHexString(hashCode())));
1267             if (!TextUtils.isEmpty(accountName))
1268                 b.append(String.format(" acc'%s'", accountName));
1269
1270             if (amountSet)
1271                 b.append(amountText)
1272                  .append(" [")
1273                  .append(amountValid ? "valid" : "invalid")
1274                  .append("] ")
1275                  .append(String.format(Locale.ROOT, " {raw %4.2f}", amount));
1276             else if (amountHintIsSet)
1277                 b.append(String.format(" (hint %s)", amountHint));
1278
1279             if (!TextUtils.isEmpty(currency))
1280                 b.append(" ")
1281                  .append(currency);
1282
1283             if (!TextUtils.isEmpty(comment))
1284                 b.append(String.format(" /%s/", comment));
1285
1286             if (isLast)
1287                 b.append(" last");
1288
1289             return b.toString();
1290         }
1291         public boolean equalContents(TransactionAccount other) {
1292             if (other == null)
1293                 return false;
1294
1295             boolean equal = Misc.equalStrings(accountName, other.accountName);
1296             equal = equal && Misc.equalStrings(comment, other.comment) &&
1297                     (amountSet ? other.amountSet && amountValid == other.amountValid &&
1298                                  Misc.equalStrings(amountText, other.amountText)
1299                                : !other.amountSet);
1300
1301             // compare amount hint only if there is no amount
1302             if (!amountSet)
1303                 equal = equal && (amountHintIsSet ? other.amountHintIsSet &&
1304                                                     Misc.equalStrings(amountHint, other.amountHint)
1305                                                   : !other.amountHintIsSet);
1306             equal = equal && Misc.equalStrings(currency, other.currency) && isLast == other.isLast;
1307
1308             Logger.debug("new-trans",
1309                     String.format("Comparing {%s} and {%s}: %s", this, other, equal));
1310             return equal;
1311         }
1312         public int getAccountNameCursorPosition() {
1313             return accountNameCursorPosition;
1314         }
1315         public void setAccountNameCursorPosition(int position) {
1316             this.accountNameCursorPosition = position;
1317         }
1318     }
1319
1320     private static class BalanceForCurrency {
1321         private final HashMap<String, Float> hashMap = new HashMap<>();
1322         float get(String currencyName) {
1323             Float f = hashMap.get(currencyName);
1324             if (f == null) {
1325                 f = 0f;
1326                 hashMap.put(currencyName, f);
1327             }
1328             return f;
1329         }
1330         void add(String currencyName, float amount) {
1331             hashMap.put(currencyName, get(currencyName) + amount);
1332         }
1333         Set<String> currencies() {
1334             return hashMap.keySet();
1335         }
1336         boolean containsCurrency(String currencyName) {
1337             return hashMap.containsKey(currencyName);
1338         }
1339     }
1340
1341     private static class ItemsForCurrency {
1342         private final HashMap<@NotNull String, List<Item>> hashMap = new HashMap<>();
1343         @NonNull
1344         List<NewTransactionModel.Item> getList(@NotNull String currencyName) {
1345             List<NewTransactionModel.Item> list = hashMap.get(currencyName);
1346             if (list == null) {
1347                 list = new ArrayList<>();
1348                 hashMap.put(currencyName, list);
1349             }
1350             return list;
1351         }
1352         void add(@NotNull String currencyName, @NonNull NewTransactionModel.Item item) {
1353             getList(Objects.requireNonNull(currencyName)).add(item);
1354         }
1355         int size(@NotNull String currencyName) {
1356             return this.getList(Objects.requireNonNull(currencyName))
1357                        .size();
1358         }
1359         Set<String> currencies() {
1360             return hashMap.keySet();
1361         }
1362     }
1363 }