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

   1 /*
   2  * Copyright © 2021 Damyan Ivanov.
   3  * This file is part of MoLe.
   4  * MoLe is free software: you can distribute it and/or modify it
   5  * under the term of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your opinion), any later version.
   8  *
   9  * MoLe is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License terms for details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with MoLe. If not, see <https://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.ktnx.mobileledger.ui.new_transaction;
  19
  20 import android.annotation.SuppressLint;
  21 import android.text.TextUtils;
  22
  23 import androidx.annotation.NonNull;
  24 import androidx.annotation.Nullable;
  25 import androidx.lifecycle.LifecycleOwner;
  26 import androidx.lifecycle.LiveData;
  27 import androidx.lifecycle.MutableLiveData;
  28 import androidx.lifecycle.Observer;
  29 import androidx.lifecycle.ViewModel;
  30
  31 import net.ktnx.mobileledger.BuildConfig;
  32 import net.ktnx.mobileledger.db.DB;
  33 import net.ktnx.mobileledger.db.TemplateAccount;
  34 import net.ktnx.mobileledger.db.TemplateHeader;
  35 import net.ktnx.mobileledger.model.Data;
  36 import net.ktnx.mobileledger.model.InertMutableLiveData;
  37 import net.ktnx.mobileledger.model.LedgerTransaction;
  38 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  39 import net.ktnx.mobileledger.model.MatchedTemplate;
  40 import net.ktnx.mobileledger.model.MobileLedgerProfile;
  41 import net.ktnx.mobileledger.utils.Globals;
  42 import net.ktnx.mobileledger.utils.Logger;
  43 import net.ktnx.mobileledger.utils.Misc;
  44 import net.ktnx.mobileledger.utils.SimpleDate;
  45
  46 import org.jetbrains.annotations.NotNull;
  47
  48 import java.text.ParseException;
  49 import java.util.ArrayList;
  50 import java.util.Calendar;
  51 import java.util.GregorianCalendar;
  52 import java.util.HashMap;
  53 import java.util.List;
  54 import java.util.Locale;
  55 import java.util.Objects;
  56 import java.util.Set;
  57 import java.util.concurrent.atomic.AtomicInteger;
  58 import java.util.regex.MatchResult;
  59
  60 enum ItemType {generalData, transactionRow}
  61
  62 enum FocusedElement {Account, Comment, Amount, Description, TransactionComment}
  63
  64
  65 public class NewTransactionModel extends ViewModel {
  66     private static final int MIN_ITEMS = 3;
  67     private final MutableLiveData<Boolean> showCurrency = new MutableLiveData<>(false);
  68     private final MutableLiveData<Boolean> isSubmittable = new InertMutableLiveData<>(false);
  69     private final MutableLiveData<Boolean> showComments = new MutableLiveData<>(true);
  70     private final MutableLiveData<List<Item>> items = new MutableLiveData<>();
  71     private final MutableLiveData<Boolean> simulateSave = new InertMutableLiveData<>(false);
  72     private final AtomicInteger busyCounter = new AtomicInteger(0);
  73     private final MutableLiveData<Boolean> busyFlag = new InertMutableLiveData<>(false);
  74     private final Observer<MobileLedgerProfile> profileObserver = profile -> {
  75         showCurrency.postValue(profile.getShowCommodityByDefault());
  76         showComments.postValue(profile.getShowCommentsByDefault());
  77     };
  78     private final MutableLiveData<FocusInfo> focusInfo = new MutableLiveData<>();
  79     private boolean observingDataProfile;
  80     public NewTransactionModel() {
  81         reset();
  82     }
  83     public LiveData<Boolean> getShowCurrency() {
  84         return showCurrency;
  85     }
  86     public LiveData<List<Item>> getItems() {
  87         return items;
  88     }
  89     private void setItems(@NonNull List<Item> newList) {
  90         checkTransactionSubmittable(newList);
  91         setItemsWithoutSubmittableChecks(newList);
  92     }
  93     private void setItemsWithoutSubmittableChecks(@NonNull List<Item> list) {
  94         Logger.debug("new-trans", "model: Setting new item list");
  95         final int cnt = list.size();
  96         for (int i = 1; i < cnt - 1; i++) {
  97             final TransactionAccount item = list.get(i)
  98                                                 .toTransactionAccount();
  99             if (item.isLast) {
 100                 TransactionAccount replacement = new TransactionAccount(item);
 101                 replacement.isLast = false;
 102                 list.set(i, replacement);
 103             }
 104         }
 105         final TransactionAccount last = list.get(cnt - 1)
 106                                             .toTransactionAccount();
 107         if (!last.isLast) {
 108             TransactionAccount replacement = new TransactionAccount(last);
 109             replacement.isLast = true;
 110             list.set(cnt - 1, replacement);
 111         }
 112
 113         items.setValue(list);
 114     }
 115     private List<Item> copyList() {
 116         return copyList(null);
 117     }
 118     private List<Item> copyList(@Nullable List<Item> source) {
 119         List<Item> copy = new ArrayList<>();
 120         List<Item> oldList = (source == null) ? items.getValue() : source;
 121
 122         if (oldList != null)
 123             for (Item item : oldList) {
 124                 copy.add(Item.from(item));
 125             }
 126
 127         return copy;
 128     }
 129     private List<Item> shallowCopyListWithoutItem(int position) {
 130         List<Item> copy = new ArrayList<>();
 131         List<Item> oldList = items.getValue();
 132
 133         if (oldList != null) {
 134             int i = 0;
 135             for (Item item : oldList) {
 136                 if (i++ == position)
 137                     continue;
 138                 copy.add(item);
 139             }
 140         }
 141
 142         return copy;
 143     }
 144     private List<Item> shallowCopyList() {
 145         return new ArrayList<>(items.getValue());
 146     }
 147     LiveData<Boolean> getShowComments() {
 148         return showComments;
 149     }
 150     void observeDataProfile(LifecycleOwner activity) {
 151         if (!observingDataProfile)
 152             Data.observeProfile(activity, profileObserver);
 153         observingDataProfile = true;
 154     }
 155     boolean getSimulateSaveFlag() {
 156         Boolean value = simulateSave.getValue();
 157         if (value == null)
 158             return false;
 159         return value;
 160     }
 161     LiveData<Boolean> getSimulateSave() {
 162         return simulateSave;
 163     }
 164     void toggleSimulateSave() {
 165         simulateSave.setValue(!getSimulateSaveFlag());
 166     }
 167     LiveData<Boolean> isSubmittable() {
 168         return this.isSubmittable;
 169     }
 170     void reset() {
 171         List<Item> list = new ArrayList<>();
 172         list.add(new TransactionHead(""));
 173         list.add(new TransactionAccount(""));
 174         list.add(new TransactionAccount(""));
 175         setItemsWithoutSubmittableChecks(list);
 176     }
 177     boolean accountsInInitialState() {
 178         final List<Item> list = items.getValue();
 179
 180         if (list == null)
 181             return true;
 182
 183         for (Item item : list) {
 184             if (!(item instanceof TransactionAccount))
 185                 continue;
 186
 187             TransactionAccount accRow = (TransactionAccount) item;
 188             if (!accRow.isEmpty())
 189                 return false;
 190         }
 191
 192         return true;
 193     }
 194     void applyTemplate(MatchedTemplate matchedTemplate, String text) {
 195         SimpleDate transactionDate = null;
 196         final MatchResult matchResult = matchedTemplate.matchResult;
 197         final TemplateHeader templateHead = matchedTemplate.templateHead;
 198         {
 199             int day = extractIntFromMatches(matchResult, templateHead.getDateDayMatchGroup(),
 200                     templateHead.getDateDay());
 201             int month = extractIntFromMatches(matchResult, templateHead.getDateMonthMatchGroup(),
 202                     templateHead.getDateMonth());
 203             int year = extractIntFromMatches(matchResult, templateHead.getDateYearMatchGroup(),
 204                     templateHead.getDateYear());
 205
 206             if (year > 0 || month > 0 || day > 0) {
 207                 SimpleDate today = SimpleDate.today();
 208                 if (year <= 0)
 209                     year = today.year;
 210                 if (month <= 0)
 211                     month = today.month;
 212                 if (day <= 0)
 213                     day = today.day;
 214
 215                 transactionDate = new SimpleDate(year, month, day);
 216
 217                 Logger.debug("pattern", "setting transaction date to " + transactionDate);
 218             }
 219         }
 220
 221         List<Item> present = copyList();
 222
 223         TransactionHead head = new TransactionHead(present.get(0)
 224                                                           .toTransactionHead());
 225         if (transactionDate != null)
 226             head.setDate(transactionDate);
 227
 228         final String transactionDescription = extractStringFromMatches(matchResult,
 229                 templateHead.getTransactionDescriptionMatchGroup(),
 230                 templateHead.getTransactionDescription());
 231         if (Misc.emptyIsNull(transactionDescription) != null)
 232             head.setDescription(transactionDescription);
 233
 234         final String transactionComment = extractStringFromMatches(matchResult,
 235                 templateHead.getTransactionCommentMatchGroup(),
 236                 templateHead.getTransactionComment());
 237         if (Misc.emptyIsNull(transactionComment) != null)
 238             head.setComment(transactionComment);
 239
 240         List<Item> newItems = new ArrayList<>();
 241
 242         newItems.add(head);
 243
 244         for (int i = 1; i < present.size(); i++) {
 245             final TransactionAccount row = present.get(i)
 246                                                   .toTransactionAccount();
 247             if (!row.isEmpty())
 248                 newItems.add(new TransactionAccount(row));
 249         }
 250
 251         DB.get()
 252           .getTemplateDAO()
 253           .getTemplateWithAccountsAsync(templateHead.getId(), entry -> {
 254               int rowIndex = 0;
 255               final boolean accountsInInitialState = accountsInInitialState();
 256               for (TemplateAccount acc : entry.accounts) {
 257                   rowIndex++;
 258
 259                   String accountName =
 260                           extractStringFromMatches(matchResult, acc.getAccountNameMatchGroup(),
 261                                   acc.getAccountName());
 262                   String accountComment =
 263                           extractStringFromMatches(matchResult, acc.getAccountCommentMatchGroup(),
 264                                   acc.getAccountComment());
 265                   Float amount = extractFloatFromMatches(matchResult, acc.getAmountMatchGroup(),
 266                           acc.getAmount());
 267                   if (amount != null && acc.getNegateAmount() != null && acc.getNegateAmount())
 268                       amount = -amount;
 269
 270                   // TODO currency
 271                   TransactionAccount accRow = new TransactionAccount(accountName);
 272                   accRow.setComment(accountComment);
 273                   if (amount != null)
 274                       accRow.setAmount(amount);
 275
 276                   newItems.add(accRow);
 277               }
 278
 279               items.postValue(newItems);
 280           });
 281     }
 282     private int extractIntFromMatches(MatchResult m, Integer group, Integer literal) {
 283         if (literal != null)
 284             return literal;
 285
 286         if (group != null) {
 287             int grp = group;
 288             if (grp > 0 & grp <= m.groupCount())
 289                 try {
 290                     return Integer.parseInt(m.group(grp));
 291                 }
 292                 catch (NumberFormatException e) {
 293                     Logger.debug("new-trans", "Error extracting matched number", e);
 294                 }
 295         }
 296
 297         return 0;
 298     }
 299     private String extractStringFromMatches(MatchResult m, Integer group, String literal) {
 300         if (literal != null)
 301             return literal;
 302
 303         if (group != null) {
 304             int grp = group;
 305             if (grp > 0 & grp <= m.groupCount())
 306                 return m.group(grp);
 307         }
 308
 309         return null;
 310     }
 311     private Float extractFloatFromMatches(MatchResult m, Integer group, Float literal) {
 312         if (literal != null)
 313             return literal;
 314
 315         if (group != null) {
 316             int grp = group;
 317             if (grp > 0 & grp <= m.groupCount())
 318                 try {
 319                     return Float.valueOf(m.group(grp));
 320                 }
 321                 catch (NumberFormatException e) {
 322                     Logger.debug("new-trans", "Error extracting matched number", e);
 323                 }
 324         }
 325
 326         return null;
 327     }
 328     void removeItem(int pos) {
 329         List<Item> newList = shallowCopyListWithoutItem(pos);
 330         setItems(newList);
 331     }
 332     void noteFocusChanged(int position, FocusedElement element) {
 333         FocusInfo present = focusInfo.getValue();
 334         if (present == null || present.position != position || present.element != element)
 335             focusInfo.setValue(new FocusInfo(position, element));
 336     }
 337     public LiveData<FocusInfo> getFocusInfo() {
 338         return focusInfo;
 339     }
 340     void moveItem(int fromIndex, int toIndex) {
 341         List<Item> newList = shallowCopyList();
 342         Item item = newList.remove(fromIndex);
 343         newList.add(toIndex, item);
 344         items.setValue(newList); // same count, same submittable state
 345     }
 346     void moveItemLast(List<Item> list, int index) {
 347         /*   0
 348              1   <-- index
 349              2
 350              3   <-- desired position
 351                  (no bottom filler)
 352          */
 353         int itemCount = list.size();
 354
 355         if (index < itemCount - 1)
 356             list.add(list.remove(index));
 357     }
 358     void toggleCurrencyVisible() {
 359         showCurrency.setValue(!Objects.requireNonNull(showCurrency.getValue()));
 360     }
 361     void stopObservingBusyFlag(Observer<Boolean> observer) {
 362         busyFlag.removeObserver(observer);
 363     }
 364     void incrementBusyCounter() {
 365         int newValue = busyCounter.incrementAndGet();
 366         if (newValue == 1)
 367             busyFlag.postValue(true);
 368     }
 369     void decrementBusyCounter() {
 370         int newValue = busyCounter.decrementAndGet();
 371         if (newValue == 0)
 372             busyFlag.postValue(false);
 373     }
 374     public LiveData<Boolean> getBusyFlag() {
 375         return busyFlag;
 376     }
 377     public void toggleShowComments() {
 378         showComments.setValue(!Objects.requireNonNull(showComments.getValue()));
 379     }
 380     public LedgerTransaction constructLedgerTransaction() {
 381         List<Item> list = Objects.requireNonNull(items.getValue());
 382         TransactionHead head = list.get(0)
 383                                    .toTransactionHead();
 384         SimpleDate date = head.getDate();
 385         LedgerTransaction tr = head.asLedgerTransaction();
 386
 387         tr.setComment(head.getComment());
 388         LedgerTransactionAccount emptyAmountAccount = null;
 389         float emptyAmountAccountBalance = 0;
 390         for (int i = 1; i < list.size(); i++) {
 391             TransactionAccount item = list.get(i)
 392                                           .toTransactionAccount();
 393             LedgerTransactionAccount acc = new LedgerTransactionAccount(item.getAccountName()
 394                                                                             .trim(),
 395                     item.getCurrency());
 396             if (acc.getAccountName()
 397                    .isEmpty())
 398                 continue;
 399
 400             acc.setComment(item.getComment());
 401
 402             if (item.isAmountSet()) {
 403                 acc.setAmount(item.getAmount());
 404                 emptyAmountAccountBalance += item.getAmount();
 405             }
 406             else {
 407                 emptyAmountAccount = acc;
 408             }
 409
 410             tr.addAccount(acc);
 411         }
 412
 413         if (emptyAmountAccount != null)
 414             emptyAmountAccount.setAmount(-emptyAmountAccountBalance);
 415
 416         return tr;
 417     }
 418     void loadTransactionIntoModel(String profileUUID, int transactionId) {
 419         List<Item> newList = new ArrayList<>();
 420         LedgerTransaction tr;
 421         MobileLedgerProfile profile = Data.getProfile(profileUUID);
 422         if (profile == null)
 423             throw new RuntimeException(String.format(
 424                     "Unable to find profile %s, which is supposed to contain transaction %d",
 425                     profileUUID, transactionId));
 426
 427         tr = profile.loadTransaction(transactionId);
 428         TransactionHead head = new TransactionHead(tr.getDescription());
 429         head.setComment(tr.getComment());
 430
 431         newList.add(head);
 432
 433         List<LedgerTransactionAccount> accounts = tr.getAccounts();
 434
 435         TransactionAccount firstNegative = null;
 436         TransactionAccount firstPositive = null;
 437         int singleNegativeIndex = -1;
 438         int singlePositiveIndex = -1;
 439         int negativeCount = 0;
 440         for (int i = 0; i < accounts.size(); i++) {
 441             LedgerTransactionAccount acc = accounts.get(i);
 442             TransactionAccount item =
 443                     new TransactionAccount(acc.getAccountName(), acc.getCurrency());
 444             newList.add(item);
 445
 446             item.setAccountName(acc.getAccountName());
 447             item.setComment(acc.getComment());
 448             if (acc.isAmountSet()) {
 449                 item.setAmount(acc.getAmount());
 450                 if (acc.getAmount() < 0) {
 451                     if (firstNegative == null) {
 452                         firstNegative = item;
 453                         singleNegativeIndex = i + 1;
 454                     }
 455                     else
 456                         singleNegativeIndex = -1;
 457                 }
 458                 else {
 459                     if (firstPositive == null) {
 460                         firstPositive = item;
 461                         singlePositiveIndex = i + 1;
 462                     }
 463                     else
 464                         singlePositiveIndex = -1;
 465                 }
 466             }
 467             else
 468                 item.resetAmount();
 469         }
 470         if (BuildConfig.DEBUG)
 471             dumpItemList("Loaded previous transaction", newList);
 472
 473         if (singleNegativeIndex != -1) {
 474             firstNegative.resetAmount();
 475             moveItemLast(newList, singleNegativeIndex);
 476         }
 477         else if (singlePositiveIndex != -1) {
 478             firstPositive.resetAmount();
 479             moveItemLast(newList, singlePositiveIndex);
 480         }
 481
 482         setItems(newList);
 483
 484         noteFocusChanged(1, FocusedElement.Amount);
 485     }
 486     /**
 487      * A transaction is submittable if:
 488      * 0) has description
 489      * 1) has at least two account names
 490      * 2) each row with amount has account name
 491      * 3) for each commodity:
 492      * 3a) amounts must balance to 0, or
 493      * 3b) there must be exactly one empty amount (with account)
 494      * 4) empty accounts with empty amounts are ignored
 495      * Side effects:
 496      * 5) a row with an empty account name or empty amount is guaranteed to exist for each
 497      * commodity
 498      * 6) at least two rows need to be present in the ledger
 499      *
 500      * @param list - the item list to check. Can be the displayed list or a list that will be
 501      *             displayed soon
 502      */
 503     @SuppressLint("DefaultLocale")
 504     void checkTransactionSubmittable(@Nullable List<Item> list) {
 505         boolean workingWithLiveList = false;
 506         boolean liveListCopied = false;
 507         if (list == null) {
 508             list = Objects.requireNonNull(items.getValue());
 509             workingWithLiveList = true;
 510         }
 511
 512         if (BuildConfig.DEBUG)
 513             dumpItemList("Before submittable checks", list);
 514
 515         int accounts = 0;
 516         final BalanceForCurrency balance = new BalanceForCurrency();
 517         final String descriptionText = list.get(0)
 518                                            .toTransactionHead()
 519                                            .getDescription();
 520         boolean submittable = true;
 521         boolean listChanged = false;
 522         final ItemsForCurrency itemsForCurrency = new ItemsForCurrency();
 523         final ItemsForCurrency itemsWithEmptyAmountForCurrency = new ItemsForCurrency();
 524         final ItemsForCurrency itemsWithAccountAndEmptyAmountForCurrency = new ItemsForCurrency();
 525         final ItemsForCurrency itemsWithEmptyAccountForCurrency = new ItemsForCurrency();
 526         final ItemsForCurrency itemsWithAmountForCurrency = new ItemsForCurrency();
 527         final ItemsForCurrency itemsWithAccountForCurrency = new ItemsForCurrency();
 528         final ItemsForCurrency emptyRowsForCurrency = new ItemsForCurrency();
 529         final List<Item> emptyRows = new ArrayList<>();
 530
 531         try {
 532             if ((descriptionText == null) || descriptionText.trim()
 533                                                             .isEmpty())
 534             {
 535                 Logger.debug("submittable", "Transaction not submittable: missing description");
 536                 submittable = false;
 537             }
 538
 539             for (int i = 1; i < list.size(); i++) {
 540                 TransactionAccount item = list.get(i)
 541                                               .toTransactionAccount();
 542
 543                 String accName = item.getAccountName()
 544                                      .trim();
 545                 String currName = item.getCurrency();
 546
 547                 itemsForCurrency.add(currName, item);
 548
 549                 if (accName.isEmpty()) {
 550                     itemsWithEmptyAccountForCurrency.add(currName, item);
 551
 552                     if (item.isAmountSet()) {
 553                         // 2) each amount has account name
 554                         Logger.debug("submittable", String.format(
 555                                 "Transaction not submittable: row %d has no account name, but" +
 556                                 " has" + " amount %1.2f", i + 1, item.getAmount()));
 557                         submittable = false;
 558                     }
 559                     else {
 560                         emptyRowsForCurrency.add(currName, item);
 561                     }
 562                 }
 563                 else {
 564                     accounts++;
 565                     itemsWithAccountForCurrency.add(currName, item);
 566                 }
 567
 568                 if (!item.isAmountValid()) {
 569                     Logger.debug("submittable",
 570                             String.format("Not submittable: row %d has an invalid amount", i + 1));
 571                     submittable = false;
 572                 }
 573                 else if (item.isAmountSet()) {
 574                     itemsWithAmountForCurrency.add(currName, item);
 575                     balance.add(currName, item.getAmount());
 576                 }
 577                 else {
 578                     itemsWithEmptyAmountForCurrency.add(currName, item);
 579
 580                     if (!accName.isEmpty())
 581                         itemsWithAccountAndEmptyAmountForCurrency.add(currName, item);
 582                 }
 583             }
 584
 585             // 1) has at least two account names
 586             if (accounts < 2) {
 587                 if (accounts == 0)
 588                     Logger.debug("submittable", "Transaction not submittable: no account names");
 589                 else if (accounts == 1)
 590                     Logger.debug("submittable",
 591                             "Transaction not submittable: only one account name");
 592                 else
 593                     Logger.debug("submittable",
 594                             String.format("Transaction not submittable: only %d account names",
 595                                     accounts));
 596                 submittable = false;
 597             }
 598
 599             // 3) for each commodity:
 600             // 3a) amount must balance to 0, or
 601             // 3b) there must be exactly one empty amount (with account)
 602             for (String balCurrency : itemsForCurrency.currencies()) {
 603                 float currencyBalance = balance.get(balCurrency);
 604                 if (Misc.isZero(currencyBalance)) {
 605                     // remove hints from all amount inputs in that currency
 606                     for (int i = 1; i < list.size(); i++) {
 607                         TransactionAccount acc = list.get(i)
 608                                                      .toTransactionAccount();
 609                         if (Misc.equalStrings(acc.getCurrency(), balCurrency)) {
 610                             if (BuildConfig.DEBUG)
 611                                 Logger.debug("submittable",
 612                                         String.format("Resetting hint of '%s' [%s]",
 613                                                 Misc.nullIsEmpty(acc.getAccountName()),
 614                                                 balCurrency));
 615                             if (acc.amountHintIsSet && !TextUtils.isEmpty(acc.getAmountHint())) {
 616                                 if (workingWithLiveList && !liveListCopied) {
 617                                     list = copyList(list);
 618                                     liveListCopied = true;
 619                                 }
 620                                 final TransactionAccount newAcc = new TransactionAccount(acc);
 621                                 newAcc.setAmountHint(null);
 622                                 if (!liveListCopied) {
 623                                     list = copyList(list);
 624                                     liveListCopied = true;
 625                                 }
 626                                 list.set(i, newAcc);
 627                                 listChanged = true;
 628                             }
 629                         }
 630                     }
 631                 }
 632                 else {
 633                     List<Item> tmpList =
 634                             itemsWithAccountAndEmptyAmountForCurrency.getList(balCurrency);
 635                     int balanceReceiversCount = tmpList.size();
 636                     if (balanceReceiversCount != 1) {
 637                         if (BuildConfig.DEBUG) {
 638                             if (balanceReceiversCount == 0)
 639                                 Logger.debug("submittable", String.format(
 640                                         "Transaction not submittable [%s]: non-zero balance " +
 641                                         "with no empty amounts with accounts", balCurrency));
 642                             else
 643                                 Logger.debug("submittable", String.format(
 644                                         "Transaction not submittable [%s]: non-zero balance " +
 645                                         "with multiple empty amounts with accounts", balCurrency));
 646                         }
 647                         submittable = false;
 648                     }
 649
 650                     List<Item> emptyAmountList =
 651                             itemsWithEmptyAmountForCurrency.getList(balCurrency);
 652
 653                     // suggest off-balance amount to a row and remove hints on other rows
 654                     Item receiver = null;
 655                     if (!tmpList.isEmpty())
 656                         receiver = tmpList.get(0);
 657                     else if (!emptyAmountList.isEmpty())
 658                         receiver = emptyAmountList.get(0);
 659
 660                     for (int i = 0; i < list.size(); i++) {
 661                         Item item = list.get(i);
 662                         if (!(item instanceof TransactionAccount))
 663                             continue;
 664
 665                         TransactionAccount acc = item.toTransactionAccount();
 666                         if (!Misc.equalStrings(acc.getCurrency(), balCurrency))
 667                             continue;
 668
 669                         if (item == receiver) {
 670                             final String hint = String.format("%1.2f", -currencyBalance);
 671                             if (!acc.isAmountHintSet() ||
 672                                 !TextUtils.equals(acc.getAmountHint(), hint))
 673                             {
 674                                 Logger.debug("submittable",
 675                                         String.format("Setting amount hint of {%s} to %s [%s]",
 676                                                 acc.toString(), hint, balCurrency));
 677                                 if (workingWithLiveList & !liveListCopied) {
 678                                     list = copyList(list);
 679                                     liveListCopied = true;
 680                                 }
 681                                 final TransactionAccount newAcc = new TransactionAccount(acc);
 682                                 newAcc.setAmountHint(hint);
 683                                 list.set(i, newAcc);
 684                                 listChanged = true;
 685                             }
 686                         }
 687                         else {
 688                             if (BuildConfig.DEBUG)
 689                                 Logger.debug("submittable",
 690                                         String.format("Resetting hint of '%s' [%s]",
 691                                                 Misc.nullIsEmpty(acc.getAccountName()),
 692                                                 balCurrency));
 693                             if (acc.amountHintIsSet && !TextUtils.isEmpty(acc.getAmountHint())) {
 694                                 if (workingWithLiveList && !liveListCopied) {
 695                                     list = copyList(list);
 696                                     liveListCopied = true;
 697                                 }
 698                                 final TransactionAccount newAcc = new TransactionAccount(acc);
 699                                 newAcc.setAmountHint(null);
 700                                 list.set(i, newAcc);
 701                                 listChanged = true;
 702                             }
 703                         }
 704                     }
 705                 }
 706             }
 707
 708             // 5) a row with an empty account name or empty amount is guaranteed to exist for
 709             // each commodity
 710             for (String balCurrency : balance.currencies()) {
 711                 int currEmptyRows = itemsWithEmptyAccountForCurrency.size(balCurrency);
 712                 int currRows = itemsForCurrency.size(balCurrency);
 713                 int currAccounts = itemsWithAccountForCurrency.size(balCurrency);
 714                 int currAmounts = itemsWithAmountForCurrency.size(balCurrency);
 715                 if ((currEmptyRows == 0) &&
 716                     ((currRows == currAccounts) || (currRows == currAmounts)))
 717                 {
 718                     // perhaps there already is an unused empty row for another currency that
 719                     // is not used?
 720 //                        boolean foundIt = false;
 721 //                        for (Item item : emptyRows) {
 722 //                            Currency itemCurrency = item.getCurrency();
 723 //                            String itemCurrencyName =
 724 //                                    (itemCurrency == null) ? "" : itemCurrency.getName();
 725 //                            if (Misc.isZero(balance.get(itemCurrencyName))) {
 726 //                                item.setCurrency(Currency.loadByName(balCurrency));
 727 //                                item.setAmountHint(
 728 //                                        String.format("%1.2f", -balance.get(balCurrency)));
 729 //                                foundIt = true;
 730 //                                break;
 731 //                            }
 732 //                        }
 733 //
 734 //                        if (!foundIt)
 735                     if (workingWithLiveList && !liveListCopied) {
 736                         list = copyList(list);
 737                         liveListCopied = true;
 738                     }
 739                     final TransactionAccount newAcc = new TransactionAccount("", balCurrency);
 740                     final float bal = balance.get(balCurrency);
 741                     if (!Misc.isZero(bal) && currAmounts == currRows)
 742                         newAcc.setAmountHint(String.format("%4.2f", -bal));
 743                     Logger.debug("submittable",
 744                             String.format("Adding new item with %s for currency %s",
 745                                     newAcc.getAmountHint(), balCurrency));
 746                     list.add(newAcc);
 747                     listChanged = true;
 748                 }
 749             }
 750
 751             // drop extra empty rows, not needed
 752             for (String currName : emptyRowsForCurrency.currencies()) {
 753                 List<Item> emptyItems = emptyRowsForCurrency.getList(currName);
 754                 while ((list.size() > MIN_ITEMS) && (emptyItems.size() > 1)) {
 755                     if (workingWithLiveList && !liveListCopied) {
 756                         list = copyList(list);
 757                         liveListCopied = true;
 758                     }
 759                     // the list is a copy, so the empty item is no longer present
 760                     Item itemToRemove = emptyItems.remove(1);
 761                     removeItemById(list, itemToRemove.id);
 762                     listChanged = true;
 763                 }
 764
 765                 // unused currency, remove last item (which is also an empty one)
 766                 if ((list.size() > MIN_ITEMS) && (emptyItems.size() == 1)) {
 767                     List<Item> currItems = itemsForCurrency.getList(currName);
 768
 769                     if (currItems.size() == 1) {
 770                         if (workingWithLiveList && !liveListCopied) {
 771                             list = copyList(list);
 772                             liveListCopied = true;
 773                         }
 774                         // the list is a copy, so the empty item is no longer present
 775                         removeItemById(list, emptyItems.get(0).id);
 776                         listChanged = true;
 777                     }
 778                 }
 779             }
 780
 781             // 6) at least two rows need to be present in the ledger
 782             //    (the list also contains header and trailer)
 783             while (list.size() < MIN_ITEMS) {
 784                 if (workingWithLiveList && !liveListCopied) {
 785                     list = copyList(list);
 786                     liveListCopied = true;
 787                 }
 788                 list.add(new TransactionAccount(""));
 789                 listChanged = true;
 790             }
 791
 792
 793             Logger.debug("submittable", submittable ? "YES" : "NO");
 794             isSubmittable.setValue(submittable);
 795
 796             if (BuildConfig.DEBUG)
 797                 dumpItemList("After submittable checks", list);
 798         }
 799         catch (NumberFormatException e) {
 800             Logger.debug("submittable", "NO (because of NumberFormatException)");
 801             isSubmittable.setValue(false);
 802         }
 803         catch (Exception e) {
 804             e.printStackTrace();
 805             Logger.debug("submittable", "NO (because of an Exception)");
 806             isSubmittable.setValue(false);
 807         }
 808
 809         if (listChanged && workingWithLiveList) {
 810             setItemsWithoutSubmittableChecks(list);
 811         }
 812     }
 813     private void removeItemById(@NotNull List<Item> list, int id) {
 814         if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
 815             list.removeIf(item -> item.id == id);
 816         }
 817         else {
 818             for (Item item : list) {
 819                 if (item.id == id) {
 820                     list.remove(item);
 821                     break;
 822                 }
 823             }
 824         }
 825     }
 826     @SuppressLint("DefaultLocale")
 827     private void dumpItemList(@NotNull String msg, @NotNull List<Item> list) {
 828         Logger.debug("submittable", "== Dump of all items " + msg);
 829         for (int i = 1; i < list.size(); i++) {
 830             TransactionAccount item = list.get(i)
 831                                           .toTransactionAccount();
 832             Logger.debug("submittable", String.format("%d:%s", i, item.toString()));
 833         }
 834     }
 835     public void setItemCurrency(int position, String newCurrency) {
 836         TransactionAccount item = Objects.requireNonNull(items.getValue())
 837                                          .get(position)
 838                                          .toTransactionAccount();
 839         final String oldCurrency = item.getCurrency();
 840
 841         if (Misc.equalStrings(oldCurrency, newCurrency))
 842             return;
 843
 844         List<Item> newList = copyList();
 845         newList.get(position)
 846                .toTransactionAccount()
 847                .setCurrency(newCurrency);
 848
 849         setItems(newList);
 850     }
 851     public boolean accountListIsEmpty() {
 852         List<Item> items = Objects.requireNonNull(this.items.getValue());
 853
 854         for (Item item : items) {
 855             if (!(item instanceof TransactionAccount))
 856                 continue;
 857
 858             if (!((TransactionAccount) item).isEmpty())
 859                 return false;
 860         }
 861
 862         return true;
 863     }
 864
 865     public static class FocusInfo {
 866         int position;
 867         FocusedElement element;
 868         public FocusInfo(int position, FocusedElement element) {
 869             this.position = position;
 870             this.element = element;
 871         }
 872     }
 873
 874     static abstract class Item {
 875         private static int idDispenser = 0;
 876         protected int id;
 877         private Item() {
 878             synchronized (Item.class) {
 879                 id = ++idDispenser;
 880             }
 881         }
 882         public static Item from(Item origin) {
 883             if (origin instanceof TransactionHead)
 884                 return new TransactionHead((TransactionHead) origin);
 885             if (origin instanceof TransactionAccount)
 886                 return new TransactionAccount((TransactionAccount) origin);
 887             throw new RuntimeException("Don't know how to handle " + origin);
 888         }
 889         public int getId() {
 890             return id;
 891         }
 892         public abstract ItemType getType();
 893         public TransactionHead toTransactionHead() {
 894             if (this instanceof TransactionHead)
 895                 return (TransactionHead) this;
 896
 897             throw new IllegalStateException("Wrong item type " + this);
 898         }
 899         public TransactionAccount toTransactionAccount() {
 900             if (this instanceof TransactionAccount)
 901                 return (TransactionAccount) this;
 902
 903             throw new IllegalStateException("Wrong item type " + this);
 904         }
 905         public boolean equalContents(@Nullable Object item) {
 906             if (item == null)
 907                 return false;
 908
 909             if (!getClass().equals(item.getClass()))
 910                 return false;
 911
 912             // shortcut - comparing same instance
 913             if (item == this)
 914                 return true;
 915
 916             if (this instanceof TransactionHead)
 917                 return ((TransactionHead) item).equalContents((TransactionHead) this);
 918             if (this instanceof TransactionAccount)
 919                 return ((TransactionAccount) item).equalContents((TransactionAccount) this);
 920
 921             throw new RuntimeException("Don't know how to handle " + this);
 922         }
 923     }
 924
 925
 926 //==========================================================================================
 927
 928     public static class TransactionHead extends Item {
 929         private SimpleDate date;
 930         private String description;
 931         private String comment;
 932         TransactionHead(String description) {
 933             super();
 934             this.description = description;
 935         }
 936         public TransactionHead(TransactionHead origin) {
 937             id = origin.id;
 938             date = origin.date;
 939             description = origin.description;
 940             comment = origin.comment;
 941         }
 942         public SimpleDate getDate() {
 943             return date;
 944         }
 945         public void setDate(SimpleDate date) {
 946             this.date = date;
 947         }
 948         public void setDate(String text) throws ParseException {
 949             if (Misc.emptyIsNull(text) == null) {
 950                 date = null;
 951                 return;
 952             }
 953
 954             date = Globals.parseLedgerDate(text);
 955         }
 956         /**
 957          * getFormattedDate()
 958          *
 959          * @return nicely formatted, shortest available date representation
 960          */
 961         String getFormattedDate() {
 962             if (date == null)
 963                 return null;
 964
 965             Calendar today = GregorianCalendar.getInstance();
 966
 967             if (today.get(Calendar.YEAR) != date.year) {
 968                 return String.format(Locale.US, "%d/%02d/%02d", date.year, date.month, date.day);
 969             }
 970
 971             if (today.get(Calendar.MONTH) + 1 != date.month) {
 972                 return String.format(Locale.US, "%d/%02d", date.month, date.day);
 973             }
 974
 975             return String.valueOf(date.day);
 976         }
 977         @NonNull
 978         @Override
 979         public String toString() {
 980             @SuppressLint("DefaultLocale") StringBuilder b = new StringBuilder(
 981                     String.format("id:%d/%s", id, Integer.toHexString(hashCode())));
 982
 983             if (TextUtils.isEmpty(description))
 984                 b.append(" «no description»");
 985             else
 986                 b.append(String.format(" descr'%s'", description));
 987
 988             if (date != null)
 989                 b.append(String.format("@%s", date.toString()));
 990
 991             if (!TextUtils.isEmpty(comment))
 992                 b.append(String.format(" /%s/", comment));
 993
 994             return b.toString();
 995         }
 996         public String getDescription() {
 997             return description;
 998         }
 999         public void setDescription(String description) {
1000             this.description = description;
1001         }
1002         public String getComment() {
1003             return comment;
1004         }
1005         public void setComment(String comment) {
1006             this.comment = comment;
1007         }
1008         @Override
1009         public ItemType getType() {
1010             return ItemType.generalData;
1011         }
1012         public LedgerTransaction asLedgerTransaction() {
1013             return new LedgerTransaction(null, date, description, Data.getProfile());
1014         }
1015         public boolean equalContents(TransactionHead other) {
1016             if (other == null)
1017                 return false;
1018
1019             return Objects.equals(date, other.date) &&
1020                    TextUtils.equals(description, other.description) &&
1021                    TextUtils.equals(comment, other.comment);
1022         }
1023     }
1024
1025     public static class TransactionAccount extends Item {
1026         private String accountName;
1027         private String amountHint;
1028         private String comment;
1029         private String currency;
1030         private float amount;
1031         private boolean amountSet;
1032         private boolean amountValid = true;
1033         private FocusedElement focusedElement = FocusedElement.Account;
1034         private boolean amountHintIsSet = false;
1035         private boolean isLast = false;
1036         public TransactionAccount(TransactionAccount origin) {
1037             id = origin.id;
1038             accountName = origin.accountName;
1039             amount = origin.amount;
1040             amountSet = origin.amountSet;
1041             amountHint = origin.amountHint;
1042             amountHintIsSet = origin.amountHintIsSet;
1043             comment = origin.comment;
1044             currency = origin.currency;
1045             amountValid = origin.amountValid;
1046             focusedElement = origin.focusedElement;
1047             isLast = origin.isLast;
1048         }
1049         public TransactionAccount(LedgerTransactionAccount account) {
1050             super();
1051             currency = account.getCurrency();
1052             amount = account.getAmount();
1053         }
1054         public TransactionAccount(String accountName) {
1055             super();
1056             this.accountName = accountName;
1057         }
1058         public TransactionAccount(String accountName, String currency) {
1059             super();
1060             this.accountName = accountName;
1061             this.currency = currency;
1062         }
1063         public boolean isLast() {
1064             return isLast;
1065         }
1066         public boolean isAmountSet() {
1067             return amountSet;
1068         }
1069         public String getAccountName() {
1070             return accountName;
1071         }
1072         public void setAccountName(String accountName) {
1073             this.accountName = accountName;
1074         }
1075         public float getAmount() {
1076             if (!amountSet)
1077                 throw new IllegalStateException("Amount is not set");
1078             return amount;
1079         }
1080         public void setAmount(float amount) {
1081             this.amount = amount;
1082             amountSet = true;
1083         }
1084         public void resetAmount() {
1085             amountSet = false;
1086         }
1087         @Override
1088         public ItemType getType() {
1089             return ItemType.transactionRow;
1090         }
1091         public String getAmountHint() {
1092             return amountHint;
1093         }
1094         public void setAmountHint(String amountHint) {
1095             this.amountHint = amountHint;
1096             amountHintIsSet = !TextUtils.isEmpty(amountHint);
1097         }
1098         public String getComment() {
1099             return comment;
1100         }
1101         public void setComment(String comment) {
1102             this.comment = comment;
1103         }
1104         public String getCurrency() {
1105             return currency;
1106         }
1107         public void setCurrency(String currency) {
1108             this.currency = currency;
1109         }
1110         public boolean isAmountValid() {
1111             return amountValid;
1112         }
1113         public void setAmountValid(boolean amountValid) {
1114             this.amountValid = amountValid;
1115         }
1116         public FocusedElement getFocusedElement() {
1117             return focusedElement;
1118         }
1119         public void setFocusedElement(FocusedElement focusedElement) {
1120             this.focusedElement = focusedElement;
1121         }
1122         public boolean isAmountHintSet() {
1123             return amountHintIsSet;
1124         }
1125         public void setAmountHintIsSet(boolean amountHintIsSet) {
1126             this.amountHintIsSet = amountHintIsSet;
1127         }
1128         public boolean isEmpty() {
1129             return !amountSet && Misc.emptyIsNull(accountName) == null &&
1130                    Misc.emptyIsNull(comment) == null;
1131         }
1132         @SuppressLint("DefaultLocale")
1133         @Override
1134         public String toString() {
1135             StringBuilder b = new StringBuilder();
1136             b.append(String.format("id:%d/%s", id, Integer.toHexString(hashCode())));
1137             if (!TextUtils.isEmpty(accountName))
1138                 b.append(String.format(" acc'%s'", accountName));
1139
1140             if (amountSet)
1141                 b.append(String.format(" %4.2f", amount));
1142             else if (amountHintIsSet)
1143                 b.append(String.format(" (%s)", amountHint));
1144
1145             if (!TextUtils.isEmpty(currency))
1146                 b.append(" ")
1147                  .append(currency);
1148
1149             if (!TextUtils.isEmpty(comment))
1150                 b.append(String.format(" /%s/", comment));
1151
1152             return b.toString();
1153         }
1154         public boolean equalContents(TransactionAccount other) {
1155             if (other == null)
1156                 return false;
1157
1158             boolean equal = TextUtils.equals(accountName, other.accountName) &&
1159                             TextUtils.equals(comment, other.comment) &&
1160                             (amountSet ? other.amountSet && amount == other.amount
1161                                        : !other.amountSet) &&
1162                             (amountHintIsSet ? other.amountHintIsSet &&
1163                                                TextUtils.equals(amountHint, other.amountHint)
1164                                              : !other.amountHintIsSet) &&
1165                             TextUtils.equals(currency, other.currency) && isLast == other.isLast;
1166             Logger.debug("new-trans",
1167                     String.format("Comparing {%s} and {%s}: %s", this.toString(), other.toString(),
1168                             equal));
1169             return equal;
1170         }
1171     }
1172
1173     private static class BalanceForCurrency {
1174         private final HashMap<String, Float> hashMap = new HashMap<>();
1175         float get(String currencyName) {
1176             Float f = hashMap.get(currencyName);
1177             if (f == null) {
1178                 f = 0f;
1179                 hashMap.put(currencyName, f);
1180             }
1181             return f;
1182         }
1183         void add(String currencyName, float amount) {
1184             hashMap.put(currencyName, get(currencyName) + amount);
1185         }
1186         Set<String> currencies() {
1187             return hashMap.keySet();
1188         }
1189         boolean containsCurrency(String currencyName) {
1190             return hashMap.containsKey(currencyName);
1191         }
1192     }
1193
1194     private static class ItemsForCurrency {
1195         private final HashMap<String, List<Item>> hashMap = new HashMap<>();
1196         @NonNull
1197         List<NewTransactionModel.Item> getList(@Nullable String currencyName) {
1198             List<NewTransactionModel.Item> list = hashMap.get(currencyName);
1199             if (list == null) {
1200                 list = new ArrayList<>();
1201                 hashMap.put(currencyName, list);
1202             }
1203             return list;
1204         }
1205         void add(@Nullable String currencyName, @NonNull NewTransactionModel.Item item) {
1206             getList(currencyName).add(item);
1207         }
1208         int size(@Nullable String currencyName) {
1209             return this.getList(currencyName)
1210                        .size();
1211         }
1212         Set<String> currencies() {
1213             return hashMap.keySet();
1214         }
1215     }
1216 }