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