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