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