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

   1 /*
   2  * Copyright © 2021 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.text.TextUtils;
  22
  23 import androidx.annotation.NonNull;
  24 import androidx.annotation.Nullable;
  25 import androidx.lifecycle.LifecycleOwner;
  26 import androidx.lifecycle.LiveData;
  27 import androidx.lifecycle.MutableLiveData;
  28 import androidx.lifecycle.Observer;
  29 import androidx.lifecycle.ViewModel;
  30
  31 import net.ktnx.mobileledger.BuildConfig;
  32 import net.ktnx.mobileledger.db.DB;
  33 import net.ktnx.mobileledger.db.TemplateAccount;
  34 import net.ktnx.mobileledger.db.TemplateHeader;
  35 import net.ktnx.mobileledger.model.Data;
  36 import net.ktnx.mobileledger.model.InertMutableLiveData;
  37 import net.ktnx.mobileledger.model.LedgerTransaction;
  38 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  39 import net.ktnx.mobileledger.model.MatchedTemplate;
  40 import net.ktnx.mobileledger.model.MobileLedgerProfile;
  41 import net.ktnx.mobileledger.utils.Globals;
  42 import net.ktnx.mobileledger.utils.Logger;
  43 import net.ktnx.mobileledger.utils.Misc;
  44 import net.ktnx.mobileledger.utils.SimpleDate;
  45
  46 import org.jetbrains.annotations.NotNull;
  47
  48 import java.text.ParseException;
  49 import java.util.ArrayList;
  50 import java.util.Calendar;
  51 import java.util.GregorianCalendar;
  52 import java.util.HashMap;
  53 import java.util.List;
  54 import java.util.Locale;
  55 import java.util.Objects;
  56 import java.util.Set;
  57 import java.util.concurrent.atomic.AtomicInteger;
  58 import java.util.regex.MatchResult;
  59
  60 enum ItemType {generalData, transactionRow, bottomFiller}
  61
  62 enum FocusedElement {Account, Comment, Amount, Description, TransactionComment}
  63
  64
  65 public class NewTransactionModel extends ViewModel {
  66     private final MutableLiveData<Boolean> showCurrency = new MutableLiveData<>(false);
  67     private final MutableLiveData<Boolean> isSubmittable = new InertMutableLiveData<>(false);
  68     private final MutableLiveData<Boolean> showComments = new MutableLiveData<>(true);
  69     private final MutableLiveData<List<Item>> items = new MutableLiveData<>();
  70     private final MutableLiveData<Integer> accountCount = new InertMutableLiveData<>(0);
  71     private final MutableLiveData<Boolean> simulateSave = new InertMutableLiveData<>(false);
  72     private final AtomicInteger busyCounter = new AtomicInteger(0);
  73     private final MutableLiveData<Boolean> busyFlag = new InertMutableLiveData<>(false);
  74     private final Observer<MobileLedgerProfile> profileObserver = profile -> {
  75         showCurrency.postValue(profile.getShowCommodityByDefault());
  76         showComments.postValue(profile.getShowCommentsByDefault());
  77     };
  78     private final MutableLiveData<FocusInfo> focusInfo = new MutableLiveData<>();
  79     private boolean observingDataProfile;
  80     public NewTransactionModel() {
  81         reset();
  82     }
  83     public LiveData<Boolean> getShowCurrency() {
  84         return showCurrency;
  85     }
  86     public LiveData<List<Item>> getItems() {
  87         return items;
  88     }
  89     private void setItems(@NonNull List<Item> newList) {
  90         checkTransactionSubmittable(newList);
  91         setItemsWithoutSubmittableChecks(newList);
  92     }
  93     private void setItemsWithoutSubmittableChecks(@NonNull List<Item> list) {
  94         Logger.debug("new-trans", "model: Setting new item list");
  95         items.setValue(list);
  96         accountCount.setValue(list.size() - 2);
  97     }
  98     private List<Item> copyList() {
  99         return copyList(null);
 100     }
 101     private List<Item> copyList(@Nullable List<Item> source) {
 102         List<Item> copy = new ArrayList<>();
 103         List<Item> oldList = (source == null) ? items.getValue() : source;
 104
 105         if (oldList != null)
 106             for (Item item : oldList) {
 107                 copy.add(Item.from(item));
 108             }
 109
 110         return copy;
 111     }
 112     private List<Item> shallowCopyListWithoutItem(int position) {
 113         List<Item> copy = new ArrayList<>();
 114         List<Item> oldList = items.getValue();
 115
 116         if (oldList != null) {
 117             int i = 0;
 118             for (Item item : oldList) {
 119                 if (i++ == position)
 120                     continue;
 121                 copy.add(item);
 122             }
 123         }
 124
 125         return copy;
 126     }
 127     private List<Item> shallowCopyList() {
 128         return new ArrayList<>(items.getValue());
 129     }
 130     LiveData<Boolean> getShowComments() {
 131         return showComments;
 132     }
 133     void observeDataProfile(LifecycleOwner activity) {
 134         if (!observingDataProfile)
 135             Data.observeProfile(activity, profileObserver);
 136         observingDataProfile = true;
 137     }
 138     boolean getSimulateSaveFlag() {
 139         Boolean value = simulateSave.getValue();
 140         if (value == null)
 141             return false;
 142         return value;
 143     }
 144     LiveData<Boolean> getSimulateSave() {
 145         return simulateSave;
 146     }
 147     void toggleSimulateSave() {
 148         simulateSave.setValue(!getSimulateSaveFlag());
 149     }
 150     LiveData<Boolean> isSubmittable() {
 151         return this.isSubmittable;
 152     }
 153     void reset() {
 154         List<Item> list = new ArrayList<>();
 155         list.add(new TransactionHead(""));
 156         list.add(new TransactionAccount(""));
 157         list.add(new TransactionAccount(""));
 158         list.add(new BottomFiller());
 159         items.setValue(list);
 160     }
 161     boolean accountsInInitialState() {
 162         final List<Item> list = items.getValue();
 163
 164         if (list == null)
 165             return true;
 166
 167         for (Item item : list) {
 168             if (!(item instanceof TransactionAccount))
 169                 continue;
 170
 171             TransactionAccount accRow = (TransactionAccount) item;
 172             if (!accRow.isEmpty())
 173                 return false;
 174         }
 175
 176         return true;
 177     }
 178     void applyTemplate(MatchedTemplate matchedTemplate, String text) {
 179         SimpleDate transactionDate = null;
 180         final MatchResult matchResult = matchedTemplate.matchResult;
 181         final TemplateHeader templateHead = matchedTemplate.templateHead;
 182         {
 183             int day = extractIntFromMatches(matchResult, templateHead.getDateDayMatchGroup(),
 184                     templateHead.getDateDay());
 185             int month = extractIntFromMatches(matchResult, templateHead.getDateMonthMatchGroup(),
 186                     templateHead.getDateMonth());
 187             int year = extractIntFromMatches(matchResult, templateHead.getDateYearMatchGroup(),
 188                     templateHead.getDateYear());
 189
 190             if (year > 0 || month > 0 || day > 0) {
 191                 SimpleDate today = SimpleDate.today();
 192                 if (year <= 0)
 193                     year = today.year;
 194                 if (month <= 0)
 195                     month = today.month;
 196                 if (day <= 0)
 197                     day = today.day;
 198
 199                 transactionDate = new SimpleDate(year, month, day);
 200
 201                 Logger.debug("pattern", "setting transaction date to " + transactionDate);
 202             }
 203         }
 204
 205         List<Item> present = copyList();
 206
 207         TransactionHead head = new TransactionHead(present.get(0)
 208                                                           .toTransactionHead());
 209         if (transactionDate != null)
 210             head.setDate(transactionDate);
 211
 212         final String transactionDescription = extractStringFromMatches(matchResult,
 213                 templateHead.getTransactionDescriptionMatchGroup(),
 214                 templateHead.getTransactionDescription());
 215         if (Misc.emptyIsNull(transactionDescription) != null)
 216             head.setDescription(transactionDescription);
 217
 218         final String transactionComment = extractStringFromMatches(matchResult,
 219                 templateHead.getTransactionCommentMatchGroup(),
 220                 templateHead.getTransactionComment());
 221         if (Misc.emptyIsNull(transactionComment) != null)
 222             head.setComment(transactionComment);
 223
 224         List<Item> newItems = new ArrayList<>();
 225
 226         newItems.add(head);
 227
 228         for (int i = 1; i < present.size() - 1; i++) {
 229             final TransactionAccount row = present.get(i)
 230                                                   .toTransactionAccount();
 231             if (!row.isEmpty())
 232                 newItems.add(new TransactionAccount(row));
 233         }
 234
 235         DB.get()
 236           .getTemplateDAO()
 237           .getTemplateWithAccountsAsync(templateHead.getId(), entry -> {
 238               int rowIndex = 0;
 239               final boolean accountsInInitialState = accountsInInitialState();
 240               for (TemplateAccount acc : entry.accounts) {
 241                   rowIndex++;
 242
 243                   String accountName =
 244                           extractStringFromMatches(matchResult, acc.getAccountNameMatchGroup(),
 245                                   acc.getAccountName());
 246                   String accountComment =
 247                           extractStringFromMatches(matchResult, acc.getAccountCommentMatchGroup(),
 248                                   acc.getAccountComment());
 249                   Float amount = extractFloatFromMatches(matchResult, acc.getAmountMatchGroup(),
 250                           acc.getAmount());
 251                   if (amount != null && acc.getNegateAmount() != null && acc.getNegateAmount())
 252                       amount = -amount;
 253
 254                   // TODO currency
 255                   TransactionAccount accRow = new TransactionAccount(accountName);
 256                   accRow.setComment(accountComment);
 257                   if (amount != null)
 258                       accRow.setAmount(amount);
 259
 260                   newItems.add(accRow);
 261               }
 262
 263               newItems.add(new BottomFiller());
 264
 265               items.postValue(newItems);
 266           });
 267     }
 268     private int extractIntFromMatches(MatchResult m, Integer group, Integer literal) {
 269         if (literal != null)
 270             return literal;
 271
 272         if (group != null) {
 273             int grp = group;
 274             if (grp > 0 & grp <= m.groupCount())
 275                 try {
 276                     return Integer.parseInt(m.group(grp));
 277                 }
 278                 catch (NumberFormatException e) {
 279                     Logger.debug("new-trans", "Error extracting matched number", e);
 280                 }
 281         }
 282
 283         return 0;
 284     }
 285     private String extractStringFromMatches(MatchResult m, Integer group, String literal) {
 286         if (literal != null)
 287             return literal;
 288
 289         if (group != null) {
 290             int grp = group;
 291             if (grp > 0 & grp <= m.groupCount())
 292                 return m.group(grp);
 293         }
 294
 295         return null;
 296     }
 297     private Float extractFloatFromMatches(MatchResult m, Integer group, Float literal) {
 298         if (literal != null)
 299             return literal;
 300
 301         if (group != null) {
 302             int grp = group;
 303             if (grp > 0 & grp <= m.groupCount())
 304                 try {
 305                     return Float.valueOf(m.group(grp));
 306                 }
 307                 catch (NumberFormatException e) {
 308                     Logger.debug("new-trans", "Error extracting matched number", e);
 309                 }
 310         }
 311
 312         return null;
 313     }
 314     void removeItem(int pos) {
 315         List<Item> newList = shallowCopyListWithoutItem(pos);
 316         setItems(newList);
 317     }
 318     void noteFocusChanged(int position, FocusedElement element) {
 319         FocusInfo present = focusInfo.getValue();
 320         if (present == null || present.position != position || present.element != element)
 321             focusInfo.setValue(new FocusInfo(position, element));
 322     }
 323     public LiveData<FocusInfo> getFocusInfo() {
 324         return focusInfo;
 325     }
 326     void moveItem(int fromIndex, int toIndex) {
 327         List<Item> newList = shallowCopyList();
 328         Item item = newList.remove(fromIndex);
 329         newList.add(toIndex, item);
 330         items.setValue(newList); // same count, same submittable state
 331     }
 332     void moveItemLast(List<Item> list, int index) {
 333         /*   0
 334              1   <-- index
 335              2
 336              3   <-- desired position
 337                  (no bottom filler)
 338          */
 339         int itemCount = list.size();
 340
 341         if (index < itemCount - 1)
 342             list.add(list.remove(index));
 343     }
 344     void toggleCurrencyVisible() {
 345         showCurrency.setValue(!Objects.requireNonNull(showCurrency.getValue()));
 346     }
 347     void stopObservingBusyFlag(Observer<Boolean> observer) {
 348         busyFlag.removeObserver(observer);
 349     }
 350     void incrementBusyCounter() {
 351         int newValue = busyCounter.incrementAndGet();
 352         if (newValue == 1)
 353             busyFlag.postValue(true);
 354     }
 355     void decrementBusyCounter() {
 356         int newValue = busyCounter.decrementAndGet();
 357         if (newValue == 0)
 358             busyFlag.postValue(false);
 359     }
 360     public LiveData<Boolean> getBusyFlag() {
 361         return busyFlag;
 362     }
 363     public void toggleShowComments() {
 364         showComments.setValue(!Objects.requireNonNull(showComments.getValue()));
 365     }
 366     public LedgerTransaction constructLedgerTransaction() {
 367         List<Item> list = Objects.requireNonNull(items.getValue());
 368         TransactionHead head = list.get(0)
 369                                    .toTransactionHead();
 370         SimpleDate date = head.getDate();
 371         LedgerTransaction tr = head.asLedgerTransaction();
 372
 373         tr.setComment(head.getComment());
 374         LedgerTransactionAccount emptyAmountAccount = null;
 375         float emptyAmountAccountBalance = 0;
 376         for (int i = 1; i < list.size() - 1; i++) {
 377             TransactionAccount item = list.get(i)
 378                                           .toTransactionAccount();
 379             LedgerTransactionAccount acc = new LedgerTransactionAccount(item.getAccountName()
 380                                                                             .trim(),
 381                     item.getCurrency());
 382             if (acc.getAccountName()
 383                    .isEmpty())
 384                 continue;
 385
 386             acc.setComment(item.getComment());
 387
 388             if (item.isAmountSet()) {
 389                 acc.setAmount(item.getAmount());
 390                 emptyAmountAccountBalance += item.getAmount();
 391             }
 392             else {
 393                 emptyAmountAccount = acc;
 394             }
 395
 396             tr.addAccount(acc);
 397         }
 398
 399         if (emptyAmountAccount != null)
 400             emptyAmountAccount.setAmount(-emptyAmountAccountBalance);
 401
 402         return tr;
 403     }
 404     void loadTransactionIntoModel(String profileUUID, int transactionId) {
 405         List<Item> newList = new ArrayList<>();
 406         LedgerTransaction tr;
 407         MobileLedgerProfile profile = Data.getProfile(profileUUID);
 408         if (profile == null)
 409             throw new RuntimeException(String.format(
 410                     "Unable to find profile %s, which is supposed to contain transaction %d",
 411                     profileUUID, transactionId));
 412
 413         tr = profile.loadTransaction(transactionId);
 414         TransactionHead head = new TransactionHead(tr.getDescription());
 415         head.setComment(tr.getComment());
 416
 417         newList.add(head);
 418
 419         List<LedgerTransactionAccount> accounts = tr.getAccounts();
 420
 421         TransactionAccount firstNegative = null;
 422         TransactionAccount firstPositive = null;
 423         int singleNegativeIndex = -1;
 424         int singlePositiveIndex = -1;
 425         int negativeCount = 0;
 426         for (int i = 0; i < accounts.size(); i++) {
 427             LedgerTransactionAccount acc = accounts.get(i);
 428             TransactionAccount item =
 429                     new TransactionAccount(acc.getAccountName(), acc.getCurrency());
 430             newList.add(item);
 431
 432             item.setAccountName(acc.getAccountName());
 433             item.setComment(acc.getComment());
 434             if (acc.isAmountSet()) {
 435                 item.setAmount(acc.getAmount());
 436                 if (acc.getAmount() < 0) {
 437                     if (firstNegative == null) {
 438                         firstNegative = item;
 439                         singleNegativeIndex = i + 1;
 440                     }
 441                     else
 442                         singleNegativeIndex = -1;
 443                 }
 444                 else {
 445                     if (firstPositive == null) {
 446                         firstPositive = item;
 447                         singlePositiveIndex = i + 1;
 448                     }
 449                     else
 450                         singlePositiveIndex = -1;
 451                 }
 452             }
 453             else
 454                 item.resetAmount();
 455         }
 456
 457         if (singleNegativeIndex != -1) {
 458             firstNegative.resetAmount();
 459             moveItemLast(newList, singleNegativeIndex);
 460         }
 461         else if (singlePositiveIndex != -1) {
 462             firstPositive.resetAmount();
 463             moveItemLast(newList, singlePositiveIndex);
 464         }
 465
 466         noteFocusChanged(1, FocusedElement.Description);
 467
 468         newList.add(new BottomFiller());
 469
 470         setItems(newList);
 471     }
 472     /**
 473      * A transaction is submittable if:
 474      * 0) has description
 475      * 1) has at least two account names
 476      * 2) each row with amount has account name
 477      * 3) for each commodity:
 478      * 3a) amounts must balance to 0, or
 479      * 3b) there must be exactly one empty amount (with account)
 480      * 4) empty accounts with empty amounts are ignored
 481      * Side effects:
 482      * 5) a row with an empty account name or empty amount is guaranteed to exist for each
 483      * commodity
 484      * 6) at least two rows need to be present in the ledger
 485      *
 486      * @param list - the item list to check. Can be the displayed list or a list that will be
 487      *             displayed soon
 488      */
 489     @SuppressLint("DefaultLocale")
 490     void checkTransactionSubmittable(@Nullable List<Item> list) {
 491         boolean workingWithLiveList = false;
 492         boolean liveListCopied = false;
 493         if (list == null) {
 494             list = Objects.requireNonNull(items.getValue());
 495             workingWithLiveList = true;
 496         }
 497
 498         if (BuildConfig.DEBUG)
 499             dumpItemList("Before submittable checks", list);
 500
 501         int accounts = 0;
 502         final BalanceForCurrency balance = new BalanceForCurrency();
 503         final String descriptionText = list.get(0)
 504                                            .toTransactionHead()
 505                                            .getDescription();
 506         boolean submittable = true;
 507         boolean listChanged = false;
 508         final ItemsForCurrency itemsForCurrency = new ItemsForCurrency();
 509         final ItemsForCurrency itemsWithEmptyAmountForCurrency = new ItemsForCurrency();
 510         final ItemsForCurrency itemsWithAccountAndEmptyAmountForCurrency = new ItemsForCurrency();
 511         final ItemsForCurrency itemsWithEmptyAccountForCurrency = new ItemsForCurrency();
 512         final ItemsForCurrency itemsWithAmountForCurrency = new ItemsForCurrency();
 513         final ItemsForCurrency itemsWithAccountForCurrency = new ItemsForCurrency();
 514         final ItemsForCurrency emptyRowsForCurrency = new ItemsForCurrency();
 515         final List<Item> emptyRows = new ArrayList<>();
 516
 517         try {
 518             if ((descriptionText == null) || descriptionText.trim()
 519                                                             .isEmpty())
 520             {
 521                 Logger.debug("submittable", "Transaction not submittable: missing description");
 522                 submittable = false;
 523             }
 524
 525             for (int i = 1; i < list.size() - 1; i++) {
 526                 TransactionAccount item = list.get(i)
 527                                               .toTransactionAccount();
 528
 529                 String accName = item.getAccountName()
 530                                      .trim();
 531                 String currName = item.getCurrency();
 532
 533                 itemsForCurrency.add(currName, item);
 534
 535                 if (accName.isEmpty()) {
 536                     itemsWithEmptyAccountForCurrency.add(currName, item);
 537
 538                     if (item.isAmountSet()) {
 539                         // 2) each amount has account name
 540                         Logger.debug("submittable", String.format(
 541                                 "Transaction not submittable: row %d has no account name, but" +
 542                                 " has" + " amount %1.2f", i + 1, item.getAmount()));
 543                         submittable = false;
 544                     }
 545                     else {
 546                         emptyRowsForCurrency.add(currName, item);
 547                     }
 548                 }
 549                 else {
 550                     accounts++;
 551                     itemsWithAccountForCurrency.add(currName, item);
 552                 }
 553
 554                 if (!item.isAmountValid()) {
 555                     Logger.debug("submittable",
 556                             String.format("Not submittable: row %d has an invalid amount", i + 1));
 557                     submittable = false;
 558                 }
 559                 else if (item.isAmountSet()) {
 560                     itemsWithAmountForCurrency.add(currName, item);
 561                     balance.add(currName, item.getAmount());
 562                 }
 563                 else {
 564                     itemsWithEmptyAmountForCurrency.add(currName, item);
 565
 566                     if (!accName.isEmpty())
 567                         itemsWithAccountAndEmptyAmountForCurrency.add(currName, item);
 568                 }
 569             }
 570
 571             // 1) has at least two account names
 572             if (accounts < 2) {
 573                 if (accounts == 0)
 574                     Logger.debug("submittable", "Transaction not submittable: no account names");
 575                 else if (accounts == 1)
 576                     Logger.debug("submittable",
 577                             "Transaction not submittable: only one account name");
 578                 else
 579                     Logger.debug("submittable",
 580                             String.format("Transaction not submittable: only %d account names",
 581                                     accounts));
 582                 submittable = false;
 583             }
 584
 585             // 3) for each commodity:
 586             // 3a) amount must balance to 0, or
 587             // 3b) there must be exactly one empty amount (with account)
 588             for (String balCurrency : itemsForCurrency.currencies()) {
 589                 float currencyBalance = balance.get(balCurrency);
 590                 if (Misc.isZero(currencyBalance)) {
 591                     // remove hints from all amount inputs in that currency
 592                     for (int i = 1; i < list.size() - 1; i++) {
 593                         TransactionAccount acc = list.get(i)
 594                                                      .toTransactionAccount();
 595                         if (Misc.equalStrings(acc.getCurrency(), balCurrency)) {
 596                             if (BuildConfig.DEBUG)
 597                                 Logger.debug("submittable",
 598                                         String.format("Resetting hint of '%s' [%s]",
 599                                                 Misc.nullIsEmpty(acc.getAccountName()),
 600                                                 balCurrency));
 601                             if (acc.amountHintIsSet && !TextUtils.isEmpty(acc.getAmountHint())) {
 602                                 if (workingWithLiveList && !liveListCopied) {
 603                                     list = copyList(list);
 604                                     liveListCopied = true;
 605                                 }
 606                                 final TransactionAccount newAcc = new TransactionAccount(acc);
 607                                 newAcc.setAmountHint(null);
 608                                 if (!liveListCopied) {
 609                                     list = copyList(list);
 610                                     liveListCopied = true;
 611                                 }
 612                                 list.set(i, newAcc);
 613                                 listChanged = true;
 614                             }
 615                         }
 616                     }
 617                 }
 618                 else {
 619                     List<Item> tmpList =
 620                             itemsWithAccountAndEmptyAmountForCurrency.getList(balCurrency);
 621                     int balanceReceiversCount = tmpList.size();
 622                     if (balanceReceiversCount != 1) {
 623                         if (BuildConfig.DEBUG) {
 624                             if (balanceReceiversCount == 0)
 625                                 Logger.debug("submittable", String.format(
 626                                         "Transaction not submittable [%s]: non-zero balance " +
 627                                         "with no empty amounts with accounts", balCurrency));
 628                             else
 629                                 Logger.debug("submittable", String.format(
 630                                         "Transaction not submittable [%s]: non-zero balance " +
 631                                         "with multiple empty amounts with accounts", balCurrency));
 632                         }
 633                         submittable = false;
 634                     }
 635
 636                     List<Item> emptyAmountList =
 637                             itemsWithEmptyAmountForCurrency.getList(balCurrency);
 638
 639                     // suggest off-balance amount to a row and remove hints on other rows
 640                     Item receiver = null;
 641                     if (!tmpList.isEmpty())
 642                         receiver = tmpList.get(0);
 643                     else if (!emptyAmountList.isEmpty())
 644                         receiver = emptyAmountList.get(0);
 645
 646                     for (int i = 0; i < list.size(); i++) {
 647                         Item item = list.get(i);
 648                         if (!(item instanceof TransactionAccount))
 649                             continue;
 650
 651                         TransactionAccount acc = item.toTransactionAccount();
 652                         if (!Misc.equalStrings(acc.getCurrency(), balCurrency))
 653                             continue;
 654
 655                         if (item == receiver) {
 656                             final String hint = String.format("%1.2f", -currencyBalance);
 657                             if (!acc.isAmountHintSet() ||
 658                                 !TextUtils.equals(acc.getAmountHint(), hint))
 659                             {
 660                                 Logger.debug("submittable",
 661                                         String.format("Setting amount hint of {%s} to %s [%s]",
 662                                                 acc.toString(), hint, balCurrency));
 663                                 if (workingWithLiveList & !liveListCopied) {
 664                                     list = copyList(list);
 665                                     liveListCopied = true;
 666                                 }
 667                                 final TransactionAccount newAcc = new TransactionAccount(acc);
 668                                 newAcc.setAmountHint(hint);
 669                                 list.set(i, newAcc);
 670                                 listChanged = true;
 671                             }
 672                         }
 673                         else {
 674                             if (BuildConfig.DEBUG)
 675                                 Logger.debug("submittable",
 676                                         String.format("Resetting hint of '%s' [%s]",
 677                                                 Misc.nullIsEmpty(acc.getAccountName()),
 678                                                 balCurrency));
 679                             if (acc.amountHintIsSet && !TextUtils.isEmpty(acc.getAmountHint())) {
 680                                 if (workingWithLiveList && !liveListCopied) {
 681                                     list = copyList(list);
 682                                     liveListCopied = true;
 683                                 }
 684                                 final TransactionAccount newAcc = new TransactionAccount(acc);
 685                                 newAcc.setAmountHint(null);
 686                                 list.set(i, newAcc);
 687                                 listChanged = true;
 688                             }
 689                         }
 690                     }
 691                 }
 692             }
 693
 694             // 5) a row with an empty account name or empty amount is guaranteed to exist for
 695             // each commodity
 696             for (String balCurrency : balance.currencies()) {
 697                 int currEmptyRows = itemsWithEmptyAccountForCurrency.size(balCurrency);
 698                 int currRows = itemsForCurrency.size(balCurrency);
 699                 int currAccounts = itemsWithAccountForCurrency.size(balCurrency);
 700                 int currAmounts = itemsWithAmountForCurrency.size(balCurrency);
 701                 if ((currEmptyRows == 0) &&
 702                     ((currRows == currAccounts) || (currRows == currAmounts)))
 703                 {
 704                     // perhaps there already is an unused empty row for another currency that
 705                     // is not used?
 706 //                        boolean foundIt = false;
 707 //                        for (Item item : emptyRows) {
 708 //                            Currency itemCurrency = item.getCurrency();
 709 //                            String itemCurrencyName =
 710 //                                    (itemCurrency == null) ? "" : itemCurrency.getName();
 711 //                            if (Misc.isZero(balance.get(itemCurrencyName))) {
 712 //                                item.setCurrency(Currency.loadByName(balCurrency));
 713 //                                item.setAmountHint(
 714 //                                        String.format("%1.2f", -balance.get(balCurrency)));
 715 //                                foundIt = true;
 716 //                                break;
 717 //                            }
 718 //                        }
 719 //
 720 //                        if (!foundIt)
 721                     if (workingWithLiveList && !liveListCopied) {
 722                         list = copyList(list);
 723                         liveListCopied = true;
 724                     }
 725                     final TransactionAccount newAcc = new TransactionAccount("", balCurrency);
 726                     final float bal = balance.get(balCurrency);
 727                     if (!Misc.isZero(bal) && currAmounts == currRows)
 728                         newAcc.setAmountHint(String.format("%4.2f", -bal));
 729                     Logger.debug("submittable",
 730                             String.format("Adding new item with %s for currency %s",
 731                                     newAcc.getAmountHint(), balCurrency));
 732                     list.add(list.size() - 1, newAcc);
 733                     listChanged = true;
 734                 }
 735             }
 736
 737             // drop extra empty rows, not needed
 738             for (String currName : emptyRowsForCurrency.currencies()) {
 739                 List<Item> emptyItems = emptyRowsForCurrency.getList(currName);
 740                 while ((list.size() > 4) && (emptyItems.size() > 1)) {
 741                     if (workingWithLiveList && !liveListCopied) {
 742                         list = copyList(list);
 743                         liveListCopied = true;
 744                     }
 745                     Item item = emptyItems.remove(1);
 746                     list.remove(item);
 747                     listChanged = true;
 748                 }
 749
 750                 // unused currency, remove last item (which is also an empty one)
 751                 if ((list.size() > 4) && (emptyItems.size() == 1)) {
 752                     List<Item> currItems = itemsForCurrency.getList(currName);
 753
 754                     if (currItems.size() == 1) {
 755                         if (workingWithLiveList && !liveListCopied) {
 756                             list = copyList(list);
 757                             liveListCopied = true;
 758                         }
 759                         Item item = emptyItems.get(0);
 760                         list.remove(item);
 761                         listChanged = true;
 762                     }
 763                 }
 764             }
 765
 766             // 6) at least two rows need to be present in the ledger
 767             //    (the list also contains header and trailer)
 768             while (list.size() < 4) {
 769                 if (workingWithLiveList && !liveListCopied) {
 770                     list = copyList(list);
 771                     liveListCopied = true;
 772                 }
 773                 list.add(list.size() - 1, new TransactionAccount(""));
 774                 listChanged = true;
 775             }
 776
 777
 778             Logger.debug("submittable", submittable ? "YES" : "NO");
 779             isSubmittable.setValue(submittable);
 780
 781             if (BuildConfig.DEBUG)
 782                 dumpItemList("After submittable checks", list);
 783         }
 784         catch (NumberFormatException e) {
 785             Logger.debug("submittable", "NO (because of NumberFormatException)");
 786             isSubmittable.setValue(false);
 787         }
 788         catch (Exception e) {
 789             e.printStackTrace();
 790             Logger.debug("submittable", "NO (because of an Exception)");
 791             isSubmittable.setValue(false);
 792         }
 793
 794         if (listChanged && workingWithLiveList) {
 795             setItemsWithoutSubmittableChecks(list);
 796         }
 797     }
 798     @SuppressLint("DefaultLocale")
 799     private void dumpItemList(@NotNull String msg, @NotNull List<Item> list) {
 800         Logger.debug("submittable", "== Dump of all items " + msg);
 801         for (int i = 1; i < list.size() - 1; i++) {
 802             TransactionAccount item = list.get(i)
 803                                           .toTransactionAccount();
 804             Logger.debug("submittable", String.format("%d:%s", i, item.toString()));
 805         }
 806     }
 807     public void setItemCurrency(int position, String newCurrency) {
 808         TransactionAccount item = Objects.requireNonNull(items.getValue())
 809                                          .get(position)
 810                                          .toTransactionAccount();
 811         final String oldCurrency = item.getCurrency();
 812
 813         if (Misc.equalStrings(oldCurrency, newCurrency))
 814             return;
 815
 816         List<Item> newList = copyList();
 817         newList.get(position)
 818                .toTransactionAccount()
 819                .setCurrency(newCurrency);
 820
 821         setItems(newList);
 822     }
 823     public LiveData<Integer> getAccountCount() {
 824         return accountCount;
 825     }
 826     public boolean accountListIsEmpty() {
 827         List<Item> items = Objects.requireNonNull(this.items.getValue());
 828
 829         for (Item item : items) {
 830             if (!(item instanceof TransactionAccount))
 831                 continue;
 832
 833             if (!((TransactionAccount) item).isEmpty())
 834                 return false;
 835         }
 836
 837         return true;
 838     }
 839
 840     public static class FocusInfo {
 841         int position;
 842         FocusedElement element;
 843         public FocusInfo(int position, FocusedElement element) {
 844             this.position = position;
 845             this.element = element;
 846         }
 847     }
 848
 849     static abstract class Item {
 850         private static int idDispenser = 0;
 851         protected int id;
 852         private Item() {
 853             synchronized (Item.class) {
 854                 id = ++idDispenser;
 855             }
 856         }
 857         public static Item from(Item origin) {
 858             if (origin instanceof TransactionHead)
 859                 return new TransactionHead((TransactionHead) origin);
 860             if (origin instanceof TransactionAccount)
 861                 return new TransactionAccount((TransactionAccount) origin);
 862             if (origin instanceof BottomFiller)
 863                 return new BottomFiller((BottomFiller) origin);
 864             throw new RuntimeException("Don't know how to handle " + origin);
 865         }
 866         public int getId() {
 867             return id;
 868         }
 869         public abstract ItemType getType();
 870         public TransactionHead toTransactionHead() {
 871             if (this instanceof TransactionHead)
 872                 return (TransactionHead) this;
 873
 874             throw new IllegalStateException("Wrong item type " + this);
 875         }
 876         public TransactionAccount toTransactionAccount() {
 877             if (this instanceof TransactionAccount)
 878                 return (TransactionAccount) this;
 879
 880             throw new IllegalStateException("Wrong item type " + this);
 881         }
 882         public boolean equalContents(@Nullable Object item) {
 883             if (item == null)
 884                 return false;
 885
 886             if (!getClass().equals(item.getClass()))
 887                 return false;
 888
 889             // shortcut - comparing same instance
 890             if (item == this)
 891                 return true;
 892
 893             if (this instanceof TransactionHead)
 894                 return ((TransactionHead) item).equalContents((TransactionHead) this);
 895             if (this instanceof TransactionAccount)
 896                 return ((TransactionAccount) item).equalContents((TransactionAccount) this);
 897             if (this instanceof BottomFiller)
 898                 return true;
 899
 900             throw new RuntimeException("Don't know how to handle " + this);
 901         }
 902     }
 903
 904
 905 //==========================================================================================
 906
 907     public static class TransactionHead extends Item {
 908         private SimpleDate date;
 909         private String description;
 910         private String comment;
 911         TransactionHead(String description) {
 912             super();
 913             this.description = description;
 914         }
 915         public TransactionHead(TransactionHead origin) {
 916             id = origin.id;
 917             date = origin.date;
 918             description = origin.description;
 919             comment = origin.comment;
 920         }
 921         public SimpleDate getDate() {
 922             return date;
 923         }
 924         public void setDate(SimpleDate date) {
 925             this.date = date;
 926         }
 927         public void setDate(String text) throws ParseException {
 928             if (Misc.emptyIsNull(text) == null) {
 929                 date = null;
 930                 return;
 931             }
 932
 933             date = Globals.parseLedgerDate(text);
 934         }
 935         /**
 936          * getFormattedDate()
 937          *
 938          * @return nicely formatted, shortest available date representation
 939          */
 940         String getFormattedDate() {
 941             if (date == null)
 942                 return null;
 943
 944             Calendar today = GregorianCalendar.getInstance();
 945
 946             if (today.get(Calendar.YEAR) != date.year) {
 947                 return String.format(Locale.US, "%d/%02d/%02d", date.year, date.month, date.day);
 948             }
 949
 950             if (today.get(Calendar.MONTH) + 1 != date.month) {
 951                 return String.format(Locale.US, "%d/%02d", date.month, date.day);
 952             }
 953
 954             return String.valueOf(date.day);
 955         }
 956         @NonNull
 957         @Override
 958         public String toString() {
 959             @SuppressLint("DefaultLocale") StringBuilder b = new StringBuilder(
 960                     String.format("id:%d/%s", id, Integer.toHexString(hashCode())));
 961
 962             if (TextUtils.isEmpty(description))
 963                 b.append(" «no description»");
 964             else
 965                 b.append(String.format(" descr'%s'", description));
 966
 967             if (date != null)
 968                 b.append(String.format("@%s", date.toString()));
 969
 970             if (!TextUtils.isEmpty(comment))
 971                 b.append(String.format(" /%s/", comment));
 972
 973             return b.toString();
 974         }
 975         public String getDescription() {
 976             return description;
 977         }
 978         public void setDescription(String description) {
 979             this.description = description;
 980         }
 981         public String getComment() {
 982             return comment;
 983         }
 984         public void setComment(String comment) {
 985             this.comment = comment;
 986         }
 987         @Override
 988         public ItemType getType() {
 989             return ItemType.generalData;
 990         }
 991         public LedgerTransaction asLedgerTransaction() {
 992             return new LedgerTransaction(null, date, description, Data.getProfile());
 993         }
 994         public boolean equalContents(TransactionHead other) {
 995             if (other == null)
 996                 return false;
 997
 998             return Objects.equals(date, other.date) &&
 999                    TextUtils.equals(description, other.description) &&
1000                    TextUtils.equals(comment, other.comment);
1001         }
1002     }
1003
1004     public static class BottomFiller extends Item {
1005         public BottomFiller(BottomFiller origin) {
1006             id = origin.id;
1007             // nothing to do
1008         }
1009         public BottomFiller() {
1010             super();
1011         }
1012         @Override
1013         public ItemType getType() {
1014             return ItemType.bottomFiller;
1015         }
1016         @SuppressLint("DefaultLocale")
1017         @NonNull
1018         @Override
1019         public String toString() {
1020             return String.format("id:%d «bottom filler»", id);
1021         }
1022     }
1023
1024     public static class TransactionAccount extends Item {
1025         private String accountName;
1026         private String amountHint;
1027         private String comment;
1028         private String currency;
1029         private float amount;
1030         private boolean amountSet;
1031         private boolean amountValid = true;
1032         private FocusedElement focusedElement = FocusedElement.Account;
1033         private boolean amountHintIsSet = false;
1034         public TransactionAccount(TransactionAccount origin) {
1035             id = origin.id;
1036             accountName = origin.accountName;
1037             amount = origin.amount;
1038             amountSet = origin.amountSet;
1039             amountHint = origin.amountHint;
1040             amountHintIsSet = origin.amountHintIsSet;
1041             comment = origin.comment;
1042             currency = origin.currency;
1043             amountValid = origin.amountValid;
1044             focusedElement = origin.focusedElement;
1045         }
1046         public TransactionAccount(LedgerTransactionAccount account) {
1047             super();
1048             currency = account.getCurrency();
1049             amount = account.getAmount();
1050         }
1051         public TransactionAccount(String accountName) {
1052             super();
1053             this.accountName = accountName;
1054         }
1055         public TransactionAccount(String accountName, String currency) {
1056             super();
1057             this.accountName = accountName;
1058             this.currency = currency;
1059         }
1060         public boolean isAmountSet() {
1061             return amountSet;
1062         }
1063         public String getAccountName() {
1064             return accountName;
1065         }
1066         public void setAccountName(String accountName) {
1067             this.accountName = accountName;
1068         }
1069         public float getAmount() {
1070             if (!amountSet)
1071                 throw new IllegalStateException("Amount is not set");
1072             return amount;
1073         }
1074         public void setAmount(float amount) {
1075             this.amount = amount;
1076             amountSet = true;
1077         }
1078         public void resetAmount() {
1079             amountSet = false;
1080         }
1081         @Override
1082         public ItemType getType() {
1083             return ItemType.transactionRow;
1084         }
1085         public String getAmountHint() {
1086             return amountHint;
1087         }
1088         public void setAmountHint(String amountHint) {
1089             this.amountHint = amountHint;
1090             amountHintIsSet = !TextUtils.isEmpty(amountHint);
1091         }
1092         public String getComment() {
1093             return comment;
1094         }
1095         public void setComment(String comment) {
1096             this.comment = comment;
1097         }
1098         public String getCurrency() {
1099             return currency;
1100         }
1101         public void setCurrency(String currency) {
1102             this.currency = currency;
1103         }
1104         public boolean isAmountValid() {
1105             return amountValid;
1106         }
1107         public void setAmountValid(boolean amountValid) {
1108             this.amountValid = amountValid;
1109         }
1110         public FocusedElement getFocusedElement() {
1111             return focusedElement;
1112         }
1113         public void setFocusedElement(FocusedElement focusedElement) {
1114             this.focusedElement = focusedElement;
1115         }
1116         public boolean isAmountHintSet() {
1117             return amountHintIsSet;
1118         }
1119         public void setAmountHintIsSet(boolean amountHintIsSet) {
1120             this.amountHintIsSet = amountHintIsSet;
1121         }
1122         public boolean isEmpty() {
1123             return !amountSet && Misc.emptyIsNull(accountName) == null &&
1124                    Misc.emptyIsNull(comment) == null;
1125         }
1126         @SuppressLint("DefaultLocale")
1127         @Override
1128         public String toString() {
1129             StringBuilder b = new StringBuilder();
1130             b.append(String.format("id:%d/%s", id, Integer.toHexString(hashCode())));
1131             if (!TextUtils.isEmpty(accountName))
1132                 b.append(String.format(" acc'%s'", accountName));
1133
1134             if (amountSet)
1135                 b.append(String.format(" %4.2f", amount));
1136             else if (amountHintIsSet)
1137                 b.append(String.format(" (%s)", amountHint));
1138
1139             if (!TextUtils.isEmpty(currency))
1140                 b.append(" ")
1141                  .append(currency);
1142
1143             if (!TextUtils.isEmpty(comment))
1144                 b.append(String.format(" /%s/", comment));
1145
1146             return b.toString();
1147         }
1148         public boolean equalContents(TransactionAccount other) {
1149             if (other == null)
1150                 return false;
1151
1152             boolean equal = TextUtils.equals(accountName, other.accountName) &&
1153                             TextUtils.equals(comment, other.comment) &&
1154                             (amountSet ? other.amountSet && amount == other.amount
1155                                        : !other.amountSet) &&
1156                             (amountHintIsSet ? other.amountHintIsSet &&
1157                                                TextUtils.equals(amountHint, other.amountHint)
1158                                              : !other.amountHintIsSet) &&
1159                             TextUtils.equals(currency, other.currency);
1160             Logger.debug("new-trans",
1161                     String.format("Comparing {%s} and {%s}: %s", this.toString(), other.toString(),
1162                             equal));
1163             return equal;
1164         }
1165     }
1166
1167     private static class BalanceForCurrency {
1168         private final HashMap<String, Float> hashMap = new HashMap<>();
1169         float get(String currencyName) {
1170             Float f = hashMap.get(currencyName);
1171             if (f == null) {
1172                 f = 0f;
1173                 hashMap.put(currencyName, f);
1174             }
1175             return f;
1176         }
1177         void add(String currencyName, float amount) {
1178             hashMap.put(currencyName, get(currencyName) + amount);
1179         }
1180         Set<String> currencies() {
1181             return hashMap.keySet();
1182         }
1183         boolean containsCurrency(String currencyName) {
1184             return hashMap.containsKey(currencyName);
1185         }
1186     }
1187
1188     private static class ItemsForCurrency {
1189         private final HashMap<String, List<Item>> hashMap = new HashMap<>();
1190         @NonNull
1191         List<NewTransactionModel.Item> getList(@Nullable String currencyName) {
1192             List<NewTransactionModel.Item> list = hashMap.get(currencyName);
1193             if (list == null) {
1194                 list = new ArrayList<>();
1195                 hashMap.put(currencyName, list);
1196             }
1197             return list;
1198         }
1199         void add(@Nullable String currencyName, @NonNull NewTransactionModel.Item item) {
1200             getList(currencyName).add(item);
1201         }
1202         int size(@Nullable String currencyName) {
1203             return this.getList(currencyName)
1204                        .size();
1205         }
1206         Set<String> currencies() {
1207             return hashMap.keySet();
1208         }
1209     }
1210 }