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