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