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