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