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

   1 /*
   2  * Copyright © 2021 Damyan Ivanov.
   3  * This file is part of MoLe.
   4  * MoLe is free software: you can distribute it and/or modify it
   5  * under the term of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your opinion), any later version.
   8  *
   9  * MoLe is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License terms for details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with MoLe. If not, see <https://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.ktnx.mobileledger.ui.new_transaction;
  19
  20 import android.annotation.SuppressLint;
  21 import android.text.TextUtils;
  22
  23 import androidx.annotation.NonNull;
  24 import androidx.annotation.Nullable;
  25 import androidx.lifecycle.LifecycleOwner;
  26 import androidx.lifecycle.LiveData;
  27 import androidx.lifecycle.MutableLiveData;
  28 import androidx.lifecycle.Observer;
  29 import androidx.lifecycle.ViewModel;
  30
  31 import net.ktnx.mobileledger.BuildConfig;
  32 import net.ktnx.mobileledger.db.Currency;
  33 import net.ktnx.mobileledger.db.DB;
  34 import net.ktnx.mobileledger.db.Profile;
  35 import net.ktnx.mobileledger.db.TemplateAccount;
  36 import net.ktnx.mobileledger.db.TemplateHeader;
  37 import net.ktnx.mobileledger.db.TransactionWithAccounts;
  38 import net.ktnx.mobileledger.model.Data;
  39 import net.ktnx.mobileledger.model.InertMutableLiveData;
  40 import net.ktnx.mobileledger.model.LedgerTransaction;
  41 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  42 import net.ktnx.mobileledger.model.MatchedTemplate;
  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<Profile> 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 replaceItems(@NonNull List<Item> newList) {
  96         renumberItems();
  97
  98         setItems(newList);
  99     }
 100     /**
 101      * make old items replaceable in-place. makes the new values visually blend in
 102      */
 103     private void renumberItems() {
 104         renumberItems(items.getValue());
 105     }
 106     private void renumberItems(List<Item> list) {
 107         if (list == null) {
 108             return;
 109         }
 110
 111         int id = 0;
 112         for (Item item : list)
 113             item.id = id++;
 114     }
 115     private void setItemsWithoutSubmittableChecks(@NonNull List<Item> list) {
 116         final int cnt = list.size();
 117         for (int i = 1; i < cnt - 1; i++) {
 118             final TransactionAccount item = list.get(i)
 119                                                 .toTransactionAccount();
 120             if (item.isLast) {
 121                 TransactionAccount replacement = new TransactionAccount(item);
 122                 replacement.isLast = false;
 123                 list.set(i, replacement);
 124             }
 125         }
 126         final TransactionAccount last = list.get(cnt - 1)
 127                                             .toTransactionAccount();
 128         if (!last.isLast) {
 129             TransactionAccount replacement = new TransactionAccount(last);
 130             replacement.isLast = true;
 131             list.set(cnt - 1, replacement);
 132         }
 133
 134         if (BuildConfig.DEBUG)
 135             dumpItemList("Before setValue()", list);
 136         items.setValue(list);
 137     }
 138     private List<Item> copyList() {
 139         List<Item> copy = new ArrayList<>();
 140         List<Item> oldList = items.getValue();
 141
 142         if (oldList != null)
 143             for (Item item : oldList) {
 144                 copy.add(Item.from(item));
 145             }
 146
 147         return copy;
 148     }
 149     private List<Item> copyListWithoutItem(int position) {
 150         List<Item> copy = new ArrayList<>();
 151         List<Item> oldList = items.getValue();
 152
 153         if (oldList != null) {
 154             int i = 0;
 155             for (Item item : oldList) {
 156                 if (i++ == position)
 157                     continue;
 158                 copy.add(Item.from(item));
 159             }
 160         }
 161
 162         return copy;
 163     }
 164     private List<Item> shallowCopyList() {
 165         return new ArrayList<>(Objects.requireNonNull(items.getValue()));
 166     }
 167     LiveData<Boolean> getShowComments() {
 168         return showComments;
 169     }
 170     void observeDataProfile(LifecycleOwner activity) {
 171         if (!observingDataProfile)
 172             Data.observeProfile(activity, profileObserver);
 173         observingDataProfile = true;
 174     }
 175     boolean getSimulateSaveFlag() {
 176         Boolean value = simulateSave.getValue();
 177         if (value == null)
 178             return false;
 179         return value;
 180     }
 181     LiveData<Boolean> getSimulateSave() {
 182         return simulateSave;
 183     }
 184     void toggleSimulateSave() {
 185         simulateSave.setValue(!getSimulateSaveFlag());
 186     }
 187     LiveData<Boolean> isSubmittable() {
 188         return this.isSubmittable;
 189     }
 190     void reset() {
 191         Logger.debug("new-trans", "Resetting model");
 192         List<Item> list = new ArrayList<>();
 193         Item.resetIdDispenser();
 194         list.add(new TransactionHead(""));
 195         final String defaultCurrency = Objects.requireNonNull(Data.getProfile())
 196                                               .getDefaultCommodity();
 197         list.add(new TransactionAccount("", defaultCurrency));
 198         list.add(new TransactionAccount("", defaultCurrency));
 199         noteFocusChanged(0, FocusedElement.Description);
 200         renumberItems();
 201         isSubmittable.setValue(false);
 202         setItemsWithoutSubmittableChecks(list);
 203     }
 204     boolean accountsInInitialState() {
 205         final List<Item> list = items.getValue();
 206
 207         if (list == null)
 208             return true;
 209
 210         for (Item item : list) {
 211             if (!(item instanceof TransactionAccount))
 212                 continue;
 213
 214             TransactionAccount accRow = (TransactionAccount) item;
 215             if (!accRow.isEmpty())
 216                 return false;
 217         }
 218
 219         return true;
 220     }
 221     void applyTemplate(MatchedTemplate matchedTemplate, String text) {
 222         SimpleDate transactionDate = null;
 223         final MatchResult matchResult = matchedTemplate.matchResult;
 224         final TemplateHeader templateHead = matchedTemplate.templateHead;
 225         {
 226             int day = extractIntFromMatches(matchResult, templateHead.getDateDayMatchGroup(),
 227                     templateHead.getDateDay());
 228             int month = extractIntFromMatches(matchResult, templateHead.getDateMonthMatchGroup(),
 229                     templateHead.getDateMonth());
 230             int year = extractIntFromMatches(matchResult, templateHead.getDateYearMatchGroup(),
 231                     templateHead.getDateYear());
 232
 233             if (year > 0 || month > 0 || day > 0) {
 234                 SimpleDate today = SimpleDate.today();
 235                 if (year <= 0)
 236                     year = today.year;
 237                 if (month <= 0)
 238                     month = today.month;
 239                 if (day <= 0)
 240                     day = today.day;
 241
 242                 transactionDate = new SimpleDate(year, month, day);
 243
 244                 Logger.debug("pattern", "setting transaction date to " + transactionDate);
 245             }
 246         }
 247
 248         List<Item> present = copyList();
 249
 250         TransactionHead head = new TransactionHead(present.get(0)
 251                                                           .toTransactionHead());
 252         if (transactionDate != null)
 253             head.setDate(transactionDate);
 254
 255         final String transactionDescription = extractStringFromMatches(matchResult,
 256                 templateHead.getTransactionDescriptionMatchGroup(),
 257                 templateHead.getTransactionDescription());
 258         if (Misc.emptyIsNull(transactionDescription) != null)
 259             head.setDescription(transactionDescription);
 260
 261         final String transactionComment = extractStringFromMatches(matchResult,
 262                 templateHead.getTransactionCommentMatchGroup(),
 263                 templateHead.getTransactionComment());
 264         if (Misc.emptyIsNull(transactionComment) != null)
 265             head.setComment(transactionComment);
 266
 267         List<Item> newItems = new ArrayList<>();
 268
 269         newItems.add(head);
 270
 271         for (int i = 1; i < present.size(); i++) {
 272             final TransactionAccount row = present.get(i)
 273                                                   .toTransactionAccount();
 274             if (!row.isEmpty())
 275                 newItems.add(new TransactionAccount(row));
 276         }
 277
 278         DB.get()
 279           .getTemplateDAO()
 280           .getTemplateWithAccountsAsync(templateHead.getId(), entry -> {
 281               int rowIndex = 0;
 282               final boolean accountsInInitialState = accountsInInitialState();
 283               for (TemplateAccount acc : entry.accounts) {
 284                   rowIndex++;
 285
 286                   String accountName =
 287                           extractStringFromMatches(matchResult, acc.getAccountNameMatchGroup(),
 288                                   acc.getAccountName());
 289                   String accountComment =
 290                           extractStringFromMatches(matchResult, acc.getAccountCommentMatchGroup(),
 291                                   acc.getAccountComment());
 292                   Float amount = extractFloatFromMatches(matchResult, acc.getAmountMatchGroup(),
 293                           acc.getAmount());
 294                   if (amount != null && acc.getNegateAmount() != null && acc.getNegateAmount())
 295                       amount = -amount;
 296
 297                   TransactionAccount accRow = new TransactionAccount(accountName);
 298                   accRow.setComment(accountComment);
 299                   if (amount != null)
 300                       accRow.setAmount(amount);
 301                   accRow.setCurrency(
 302                           extractCurrencyFromMatches(matchResult, acc.getCurrencyMatchGroup(),
 303                                   acc.getCurrencyObject()));
 304
 305                   newItems.add(accRow);
 306               }
 307
 308               renumberItems(newItems);
 309               Misc.onMainThread(() -> replaceItems(newItems));
 310           });
 311     }
 312     @NonNull
 313     private String extractCurrencyFromMatches(MatchResult m, Integer group, Currency literal) {
 314         return Misc.nullIsEmpty(
 315                 extractStringFromMatches(m, group, (literal == null) ? "" : literal.getName()));
 316     }
 317     private int extractIntFromMatches(MatchResult m, Integer group, Integer literal) {
 318         if (literal != null)
 319             return literal;
 320
 321         if (group != null) {
 322             int grp = group;
 323             if (grp > 0 && grp <= m.groupCount())
 324                 try {
 325                     return Integer.parseInt(m.group(grp));
 326                 }
 327                 catch (NumberFormatException e) {
 328                     Logger.debug("new-trans", "Error extracting matched number", e);
 329                 }
 330         }
 331
 332         return 0;
 333     }
 334     @Nullable
 335     private String extractStringFromMatches(MatchResult m, Integer group, String literal) {
 336         if (literal != null)
 337             return literal;
 338
 339         if (group != null) {
 340             int grp = group;
 341             if (grp > 0 && grp <= m.groupCount())
 342                 return m.group(grp);
 343         }
 344
 345         return null;
 346     }
 347     private Float extractFloatFromMatches(MatchResult m, Integer group, Float literal) {
 348         if (literal != null)
 349             return literal;
 350
 351         if (group != null) {
 352             int grp = group;
 353             if (grp > 0 && grp <= m.groupCount())
 354                 try {
 355                     return Float.valueOf(m.group(grp));
 356                 }
 357                 catch (NumberFormatException e) {
 358                     Logger.debug("new-trans", "Error extracting matched number", e);
 359                 }
 360         }
 361
 362         return null;
 363     }
 364     void removeItem(int pos) {
 365         Logger.debug("new-trans", String.format(Locale.US, "Removing item at position %d", pos));
 366         List<Item> newList = copyListWithoutItem(pos);
 367         final FocusInfo fi = focusInfo.getValue();
 368         if ((fi != null) && (pos < fi.position))
 369             noteFocusChanged(fi.position - 1, fi.element);
 370         setItems(newList);
 371     }
 372     void noteFocusChanged(int position, FocusedElement element) {
 373         FocusInfo present = focusInfo.getValue();
 374         if (present == null || present.position != position || present.element != element)
 375             focusInfo.setValue(new FocusInfo(position, element));
 376     }
 377     public LiveData<FocusInfo> getFocusInfo() {
 378         return focusInfo;
 379     }
 380     void moveItem(int fromIndex, int toIndex) {
 381         List<Item> newList = shallowCopyList();
 382         Item item = newList.remove(fromIndex);
 383         newList.add(toIndex, item);
 384
 385         FocusInfo fi = focusInfo.getValue();
 386         if (fi != null && fi.position == fromIndex)
 387             noteFocusChanged(toIndex, fi.element);
 388
 389         items.setValue(newList); // same count, same submittable state
 390     }
 391     void moveItemLast(List<Item> list, int index) {
 392         /*   0
 393              1   <-- index
 394              2
 395              3   <-- desired position
 396                  (no bottom filler)
 397          */
 398         int itemCount = list.size();
 399
 400         if (index < itemCount - 1)
 401             list.add(list.remove(index));
 402     }
 403     void toggleCurrencyVisible() {
 404         final boolean newValue = !Objects.requireNonNull(showCurrency.getValue());
 405
 406         // remove currency from all items, or reset currency to the default
 407         // no need to clone the list, because the removal of the currency won't lead to
 408         // visual changes -- the currency fields will be hidden or reset to default anyway
 409         // still, there may be changes in the submittable state
 410         final List<Item> list = Objects.requireNonNull(this.items.getValue());
 411         final Profile profile = Objects.requireNonNull(Data.getProfile());
 412         for (int i = 1; i < list.size(); i++) {
 413             ((TransactionAccount) list.get(i)).setCurrency(
 414                     newValue ? profile.getDefaultCommodity() : "");
 415         }
 416         checkTransactionSubmittable(null);
 417         showCurrency.setValue(newValue);
 418     }
 419     void stopObservingBusyFlag(Observer<Boolean> observer) {
 420         busyFlag.removeObserver(observer);
 421     }
 422     void incrementBusyCounter() {
 423         int newValue = busyCounter.incrementAndGet();
 424         if (newValue == 1)
 425             busyFlag.postValue(true);
 426     }
 427     void decrementBusyCounter() {
 428         int newValue = busyCounter.decrementAndGet();
 429         if (newValue == 0)
 430             busyFlag.postValue(false);
 431     }
 432     public LiveData<Boolean> getBusyFlag() {
 433         return busyFlag;
 434     }
 435     public void toggleShowComments() {
 436         showComments.setValue(!Objects.requireNonNull(showComments.getValue()));
 437     }
 438     public LedgerTransaction constructLedgerTransaction() {
 439         List<Item> list = Objects.requireNonNull(items.getValue());
 440         TransactionHead head = list.get(0)
 441                                    .toTransactionHead();
 442         LedgerTransaction tr = head.asLedgerTransaction();
 443
 444         tr.setComment(head.getComment());
 445         LedgerTransactionAccount emptyAmountAccount = null;
 446         float emptyAmountAccountBalance = 0;
 447         for (int i = 1; i < list.size(); i++) {
 448             TransactionAccount item = list.get(i)
 449                                           .toTransactionAccount();
 450             LedgerTransactionAccount acc = new LedgerTransactionAccount(item.getAccountName()
 451                                                                             .trim(),
 452                     item.getCurrency());
 453             if (acc.getAccountName()
 454                    .isEmpty())
 455                 continue;
 456
 457             acc.setComment(item.getComment());
 458
 459             if (item.isAmountSet()) {
 460                 acc.setAmount(item.getAmount());
 461                 emptyAmountAccountBalance += item.getAmount();
 462             }
 463             else {
 464                 emptyAmountAccount = acc;
 465             }
 466
 467             tr.addAccount(acc);
 468         }
 469
 470         if (emptyAmountAccount != null)
 471             emptyAmountAccount.setAmount(-emptyAmountAccountBalance);
 472
 473         return tr;
 474     }
 475     void loadTransactionIntoModel(@NonNull TransactionWithAccounts tr) {
 476         List<Item> newList = new ArrayList<>();
 477         Item.resetIdDispenser();
 478
 479         Item currentHead = Objects.requireNonNull(items.getValue())
 480                                   .get(0);
 481         TransactionHead head = new TransactionHead(tr.transaction.getDescription());
 482         head.setComment(tr.transaction.getComment());
 483         if (currentHead instanceof TransactionHead)
 484             head.setDate(((TransactionHead) currentHead).date);
 485
 486         newList.add(head);
 487
 488         List<LedgerTransactionAccount> accounts = new ArrayList<>();
 489         for (net.ktnx.mobileledger.db.TransactionAccount acc : tr.accounts) {
 490             accounts.add(new LedgerTransactionAccount(acc));
 491         }
 492
 493         TransactionAccount firstNegative = null;
 494         TransactionAccount firstPositive = null;
 495         int singleNegativeIndex = -1;
 496         int singlePositiveIndex = -1;
 497         int negativeCount = 0;
 498         for (int i = 0; i < accounts.size(); i++) {
 499             LedgerTransactionAccount acc = accounts.get(i);
 500             TransactionAccount item = new TransactionAccount(acc.getAccountName(),
 501                     Misc.nullIsEmpty(acc.getCurrency()));
 502             newList.add(item);
 503
 504             item.setAccountName(acc.getAccountName());
 505             item.setComment(acc.getComment());
 506             if (acc.isAmountSet()) {
 507                 item.setAmount(acc.getAmount());
 508                 if (acc.getAmount() < 0) {
 509                     if (firstNegative == null) {
 510                         firstNegative = item;
 511                         singleNegativeIndex = i + 1;
 512                     }
 513                     else
 514                         singleNegativeIndex = -1;
 515                 }
 516                 else {
 517                     if (firstPositive == null) {
 518                         firstPositive = item;
 519                         singlePositiveIndex = i + 1;
 520                     }
 521                     else
 522                         singlePositiveIndex = -1;
 523                 }
 524             }
 525             else
 526                 item.resetAmount();
 527         }
 528         if (BuildConfig.DEBUG)
 529             dumpItemList("Loaded previous transaction", newList);
 530
 531         if (singleNegativeIndex != -1) {
 532             firstNegative.resetAmount();
 533             moveItemLast(newList, singleNegativeIndex);
 534         }
 535         else if (singlePositiveIndex != -1) {
 536             firstPositive.resetAmount();
 537             moveItemLast(newList, singlePositiveIndex);
 538         }
 539
 540         Misc.onMainThread(() -> {
 541             setItems(newList);
 542             noteFocusChanged(1, FocusedElement.Amount);
 543         });
 544     }
 545     /**
 546      * A transaction is submittable if:
 547      * 0) has description
 548      * 1) has at least two account names
 549      * 2) each row with amount has account name
 550      * 3) for each commodity:
 551      * 3a) amounts must balance to 0, or
 552      * 3b) there must be exactly one empty amount (with account)
 553      * 4) empty accounts with empty amounts are ignored
 554      * Side effects:
 555      * 5) a row with an empty account name or empty amount is guaranteed to exist for each
 556      * commodity
 557      * 6) at least two rows need to be present in the ledger
 558      *
 559      * @param list - the item list to check. Can be the displayed list or a list that will be
 560      *             displayed soon
 561      */
 562     @SuppressLint("DefaultLocale")
 563     void checkTransactionSubmittable(@Nullable List<Item> list) {
 564         boolean workingWithLiveList = false;
 565         if (list == null) {
 566             list = copyList();
 567             workingWithLiveList = true;
 568         }
 569
 570         if (BuildConfig.DEBUG)
 571             dumpItemList(String.format("Before submittable checks (%s)",
 572                     workingWithLiveList ? "LIVE LIST" : "custom list"), list);
 573
 574         int accounts = 0;
 575         final BalanceForCurrency balance = new BalanceForCurrency();
 576         final String descriptionText = list.get(0)
 577                                            .toTransactionHead()
 578                                            .getDescription();
 579         boolean submittable = true;
 580         boolean listChanged = false;
 581         final ItemsForCurrency itemsForCurrency = new ItemsForCurrency();
 582         final ItemsForCurrency itemsWithEmptyAmountForCurrency = new ItemsForCurrency();
 583         final ItemsForCurrency itemsWithAccountAndEmptyAmountForCurrency = new ItemsForCurrency();
 584         final ItemsForCurrency itemsWithEmptyAccountForCurrency = new ItemsForCurrency();
 585         final ItemsForCurrency itemsWithAmountForCurrency = new ItemsForCurrency();
 586         final ItemsForCurrency itemsWithAccountForCurrency = new ItemsForCurrency();
 587         final ItemsForCurrency emptyRowsForCurrency = new ItemsForCurrency();
 588         final List<Item> emptyRows = new ArrayList<>();
 589
 590         try {
 591             if ((descriptionText == null) || descriptionText.trim()
 592                                                             .isEmpty())
 593             {
 594                 Logger.debug("submittable", "Transaction not submittable: missing description");
 595                 submittable = false;
 596             }
 597
 598             boolean hasInvalidAmount = false;
 599
 600             for (int i = 1; i < list.size(); i++) {
 601                 TransactionAccount item = list.get(i)
 602                                               .toTransactionAccount();
 603
 604                 String accName = item.getAccountName()
 605                                      .trim();
 606                 String currName = item.getCurrency();
 607
 608                 itemsForCurrency.add(currName, item);
 609
 610                 if (accName.isEmpty()) {
 611                     itemsWithEmptyAccountForCurrency.add(currName, item);
 612
 613                     if (item.isAmountSet()) {
 614                         // 2) each amount has account name
 615                         Logger.debug("submittable", String.format(
 616                                 "Transaction not submittable: row %d has no account name, but" +
 617                                 " has" + " amount %1.2f", i + 1, item.getAmount()));
 618                         submittable = false;
 619                     }
 620                     else {
 621                         emptyRowsForCurrency.add(currName, item);
 622                     }
 623                 }
 624                 else {
 625                     accounts++;
 626                     itemsWithAccountForCurrency.add(currName, item);
 627                 }
 628
 629                 if (item.isAmountSet() && item.isAmountValid()) {
 630                     itemsWithAmountForCurrency.add(currName, item);
 631                     balance.add(currName, item.getAmount());
 632                 }
 633                 else {
 634                     if (!item.isAmountValid()) {
 635                         Logger.debug("submittable",
 636                                 String.format("Not submittable: row %d has an invalid amount", i));
 637                         submittable = false;
 638                         hasInvalidAmount = true;
 639                     }
 640
 641                     itemsWithEmptyAmountForCurrency.add(currName, item);
 642
 643                     if (!accName.isEmpty())
 644                         itemsWithAccountAndEmptyAmountForCurrency.add(currName, item);
 645                 }
 646             }
 647
 648             // 1) has at least two account names
 649             if (accounts < 2) {
 650                 if (accounts == 0)
 651                     Logger.debug("submittable", "Transaction not submittable: no account names");
 652                 else if (accounts == 1)
 653                     Logger.debug("submittable",
 654                             "Transaction not submittable: only one account name");
 655                 else
 656                     Logger.debug("submittable",
 657                             String.format("Transaction not submittable: only %d account names",
 658                                     accounts));
 659                 submittable = false;
 660             }
 661
 662             // 3) for each commodity:
 663             // 3a) amount must balance to 0, or
 664             // 3b) there must be exactly one empty amount (with account)
 665             for (String balCurrency : itemsForCurrency.currencies()) {
 666                 float currencyBalance = balance.get(balCurrency);
 667                 if (Misc.isZero(currencyBalance)) {
 668                     // remove hints from all amount inputs in that currency
 669                     for (int i = 1; i < list.size(); i++) {
 670                         TransactionAccount acc = list.get(i)
 671                                                      .toTransactionAccount();
 672                         if (Misc.equalStrings(acc.getCurrency(), balCurrency)) {
 673                             if (BuildConfig.DEBUG)
 674                                 Logger.debug("submittable",
 675                                         String.format(Locale.US, "Resetting hint of %d:'%s' [%s]",
 676                                                 i, Misc.nullIsEmpty(acc.getAccountName()),
 677                                                 balCurrency));
 678                             // skip if the amount is set, in which case the hint is not
 679                             // important/visible
 680                             if (!acc.isAmountSet() && acc.amountHintIsSet &&
 681                                 !TextUtils.isEmpty(acc.getAmountHint()))
 682                             {
 683                                 acc.setAmountHint(null);
 684                                 listChanged = true;
 685                             }
 686                         }
 687                     }
 688                 }
 689                 else {
 690                     List<Item> tmpList =
 691                             itemsWithAccountAndEmptyAmountForCurrency.getList(balCurrency);
 692                     int balanceReceiversCount = tmpList.size();
 693                     if (balanceReceiversCount != 1) {
 694                         if (BuildConfig.DEBUG) {
 695                             if (balanceReceiversCount == 0)
 696                                 Logger.debug("submittable", String.format(
 697                                         "Transaction not submittable [curr:%s]: non-zero balance " +
 698                                         "with no empty amounts with accounts", balCurrency));
 699                             else
 700                                 Logger.debug("submittable", String.format(
 701                                         "Transaction not submittable [curr:%s]: non-zero balance " +
 702                                         "with multiple empty amounts with accounts", balCurrency));
 703                         }
 704                         submittable = false;
 705                     }
 706
 707                     List<Item> emptyAmountList =
 708                             itemsWithEmptyAmountForCurrency.getList(balCurrency);
 709
 710                     // suggest off-balance amount to a row and remove hints on other rows
 711                     Item receiver = null;
 712                     if (!tmpList.isEmpty())
 713                         receiver = tmpList.get(0);
 714                     else if (!emptyAmountList.isEmpty())
 715                         receiver = emptyAmountList.get(0);
 716
 717                     for (int i = 0; i < list.size(); i++) {
 718                         Item item = list.get(i);
 719                         if (!(item instanceof TransactionAccount))
 720                             continue;
 721
 722                         TransactionAccount acc = item.toTransactionAccount();
 723                         if (!Misc.equalStrings(acc.getCurrency(), balCurrency))
 724                             continue;
 725
 726                         if (item == receiver) {
 727                             final String hint = Data.formatNumber(-currencyBalance);
 728                             if (!acc.isAmountHintSet() ||
 729                                 !Misc.equalStrings(acc.getAmountHint(), hint))
 730                             {
 731                                 Logger.debug("submittable",
 732                                         String.format("Setting amount hint of {%s} to %s [%s]",
 733                                                 acc.toString(), hint, balCurrency));
 734                                 acc.setAmountHint(hint);
 735                                 listChanged = true;
 736                             }
 737                         }
 738                         else {
 739                             if (BuildConfig.DEBUG)
 740                                 Logger.debug("submittable",
 741                                         String.format("Resetting hint of '%s' [%s]",
 742                                                 Misc.nullIsEmpty(acc.getAccountName()),
 743                                                 balCurrency));
 744                             if (acc.amountHintIsSet && !TextUtils.isEmpty(acc.getAmountHint())) {
 745                                 acc.setAmountHint(null);
 746                                 listChanged = true;
 747                             }
 748                         }
 749                     }
 750                 }
 751             }
 752
 753             // 5) a row with an empty account name or empty amount is guaranteed to exist for
 754             // each commodity
 755             if (!hasInvalidAmount) {
 756                 for (String balCurrency : balance.currencies()) {
 757                     int currEmptyRows = itemsWithEmptyAccountForCurrency.size(balCurrency);
 758                     int currRows = itemsForCurrency.size(balCurrency);
 759                     int currAccounts = itemsWithAccountForCurrency.size(balCurrency);
 760                     int currAmounts = itemsWithAmountForCurrency.size(balCurrency);
 761                     if ((currEmptyRows == 0) &&
 762                         ((currRows == currAccounts) || (currRows == currAmounts)))
 763                     {
 764                         // perhaps there already is an unused empty row for another currency that
 765                         // is not used?
 766 //                        boolean foundIt = false;
 767 //                        for (Item item : emptyRows) {
 768 //                            Currency itemCurrency = item.getCurrency();
 769 //                            String itemCurrencyName =
 770 //                                    (itemCurrency == null) ? "" : itemCurrency.getName();
 771 //                            if (Misc.isZero(balance.get(itemCurrencyName))) {
 772 //                                item.setCurrency(Currency.loadByName(balCurrency));
 773 //                                item.setAmountHint(
 774 //                                        Data.formatNumber(-balance.get(balCurrency)));
 775 //                                foundIt = true;
 776 //                                break;
 777 //                            }
 778 //                        }
 779 //
 780 //                        if (!foundIt)
 781                         final TransactionAccount newAcc = new TransactionAccount("", balCurrency);
 782                         final float bal = balance.get(balCurrency);
 783                         if (!Misc.isZero(bal) && currAmounts == currRows)
 784                             newAcc.setAmountHint(Data.formatNumber(-bal));
 785                         Logger.debug("submittable",
 786                                 String.format("Adding new item with %s for currency %s",
 787                                         newAcc.getAmountHint(), balCurrency));
 788                         list.add(newAcc);
 789                         listChanged = true;
 790                     }
 791                 }
 792             }
 793
 794             // drop extra empty rows, not needed
 795             for (String currName : emptyRowsForCurrency.currencies()) {
 796                 List<Item> emptyItems = emptyRowsForCurrency.getList(currName);
 797                 while ((list.size() > MIN_ITEMS) && (emptyItems.size() > 1)) {
 798                     // the list is a copy, so the empty item is no longer present
 799                     Item itemToRemove = emptyItems.remove(1);
 800                     removeItemById(list, itemToRemove.id);
 801                     listChanged = true;
 802                 }
 803
 804                 // unused currency, remove last item (which is also an empty one)
 805                 if ((list.size() > MIN_ITEMS) && (emptyItems.size() == 1)) {
 806                     List<Item> currItems = itemsForCurrency.getList(currName);
 807
 808                     if (currItems.size() == 1) {
 809                         // the list is a copy, so the empty item is no longer present
 810                         removeItemById(list, emptyItems.get(0).id);
 811                         listChanged = true;
 812                     }
 813                 }
 814             }
 815
 816             // 6) at least two rows need to be present in the ledger
 817             //    (the list also contains header and trailer)
 818             while (list.size() < MIN_ITEMS) {
 819                 list.add(new TransactionAccount(""));
 820                 listChanged = true;
 821             }
 822
 823             Logger.debug("submittable", submittable ? "YES" : "NO");
 824             isSubmittable.setValue(submittable);
 825
 826             if (BuildConfig.DEBUG)
 827                 dumpItemList("After submittable checks", list);
 828         }
 829         catch (NumberFormatException e) {
 830             Logger.debug("submittable", "NO (because of NumberFormatException)");
 831             isSubmittable.setValue(false);
 832         }
 833         catch (Exception e) {
 834             e.printStackTrace();
 835             Logger.debug("submittable", "NO (because of an Exception)");
 836             isSubmittable.setValue(false);
 837         }
 838
 839         if (listChanged && workingWithLiveList) {
 840             setItemsWithoutSubmittableChecks(list);
 841         }
 842     }
 843     private void removeItemById(@NotNull List<Item> list, int id) {
 844         if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
 845             list.removeIf(item -> item.id == id);
 846         }
 847         else {
 848             for (Item item : list) {
 849                 if (item.id == id) {
 850                     list.remove(item);
 851                     break;
 852                 }
 853             }
 854         }
 855     }
 856     @SuppressLint("DefaultLocale")
 857     private void dumpItemList(@NotNull String msg, @NotNull List<Item> list) {
 858         Logger.debug("submittable", "== Dump of all items " + msg);
 859         for (int i = 1; i < list.size(); i++) {
 860             TransactionAccount item = list.get(i)
 861                                           .toTransactionAccount();
 862             Logger.debug("submittable", String.format("%d:%s", i, item.toString()));
 863         }
 864     }
 865     public void setItemCurrency(int position, String newCurrency) {
 866         TransactionAccount item = Objects.requireNonNull(items.getValue())
 867                                          .get(position)
 868                                          .toTransactionAccount();
 869         final String oldCurrency = item.getCurrency();
 870
 871         if (Misc.equalStrings(oldCurrency, newCurrency))
 872             return;
 873
 874         List<Item> newList = copyList();
 875         newList.get(position)
 876                .toTransactionAccount()
 877                .setCurrency(newCurrency);
 878
 879         setItems(newList);
 880     }
 881     public boolean accountListIsEmpty() {
 882         List<Item> items = Objects.requireNonNull(this.items.getValue());
 883
 884         for (Item item : items) {
 885             if (!(item instanceof TransactionAccount))
 886                 continue;
 887
 888             if (!((TransactionAccount) item).isEmpty())
 889                 return false;
 890         }
 891
 892         return true;
 893     }
 894
 895     public static class FocusInfo {
 896         int position;
 897         FocusedElement element;
 898         public FocusInfo(int position, FocusedElement element) {
 899             this.position = position;
 900             this.element = element;
 901         }
 902     }
 903
 904     static abstract class Item {
 905         private static int idDispenser = 0;
 906         protected int id;
 907         private Item() {
 908             if (this instanceof TransactionHead)
 909                 id = 0;
 910             else
 911                 synchronized (Item.class) {
 912                     id = ++idDispenser;
 913                 }
 914         }
 915         public Item(int id) {
 916             this.id = id;
 917         }
 918         public static Item from(Item origin) {
 919             if (origin instanceof TransactionHead)
 920                 return new TransactionHead((TransactionHead) origin);
 921             if (origin instanceof TransactionAccount)
 922                 return new TransactionAccount((TransactionAccount) origin);
 923             throw new RuntimeException("Don't know how to handle " + origin);
 924         }
 925         private static void resetIdDispenser() {
 926             idDispenser = 0;
 927         }
 928         public int getId() {
 929             return id;
 930         }
 931         public abstract ItemType getType();
 932         public TransactionHead toTransactionHead() {
 933             if (this instanceof TransactionHead)
 934                 return (TransactionHead) this;
 935
 936             throw new IllegalStateException("Wrong item type " + this);
 937         }
 938         public TransactionAccount toTransactionAccount() {
 939             if (this instanceof TransactionAccount)
 940                 return (TransactionAccount) this;
 941
 942             throw new IllegalStateException("Wrong item type " + this);
 943         }
 944         public boolean equalContents(@Nullable Object item) {
 945             if (item == null)
 946                 return false;
 947
 948             if (!getClass().equals(item.getClass()))
 949                 return false;
 950
 951             // shortcut - comparing same instance
 952             if (item == this)
 953                 return true;
 954
 955             if (this instanceof TransactionHead)
 956                 return ((TransactionHead) item).equalContents((TransactionHead) this);
 957             if (this instanceof TransactionAccount)
 958                 return ((TransactionAccount) item).equalContents((TransactionAccount) this);
 959
 960             throw new RuntimeException("Don't know how to handle " + this);
 961         }
 962     }
 963
 964
 965 //==========================================================================================
 966
 967     public static class TransactionHead extends Item {
 968         private SimpleDate date;
 969         private String description;
 970         private String comment;
 971         TransactionHead(String description) {
 972             super();
 973             this.description = description;
 974         }
 975         public TransactionHead(TransactionHead origin) {
 976             super(origin.id);
 977             date = origin.date;
 978             description = origin.description;
 979             comment = origin.comment;
 980         }
 981         public SimpleDate getDate() {
 982             return date;
 983         }
 984         public void setDate(SimpleDate date) {
 985             this.date = date;
 986         }
 987         public void setDate(String text) throws ParseException {
 988             if (Misc.emptyIsNull(text) == null) {
 989                 date = null;
 990                 return;
 991             }
 992
 993             date = Globals.parseLedgerDate(text);
 994         }
 995         /**
 996          * getFormattedDate()
 997          *
 998          * @return nicely formatted, shortest available date representation
 999          */
1000         String getFormattedDate() {
1001             if (date == null)
1002                 return null;
1003
1004             Calendar today = GregorianCalendar.getInstance();
1005
1006             if (today.get(Calendar.YEAR) != date.year) {
1007                 return String.format(Locale.US, "%d/%02d/%02d", date.year, date.month, date.day);
1008             }
1009
1010             if (today.get(Calendar.MONTH) + 1 != date.month) {
1011                 return String.format(Locale.US, "%d/%02d", date.month, date.day);
1012             }
1013
1014             return String.valueOf(date.day);
1015         }
1016         @NonNull
1017         @Override
1018         public String toString() {
1019             @SuppressLint("DefaultLocale") StringBuilder b = new StringBuilder(
1020                     String.format("id:%d/%s", id, Integer.toHexString(hashCode())));
1021
1022             if (TextUtils.isEmpty(description))
1023                 b.append(" «no description»");
1024             else
1025                 b.append(String.format(" '%s'", description));
1026
1027             if (date != null)
1028                 b.append(String.format("@%s", date.toString()));
1029
1030             if (!TextUtils.isEmpty(comment))
1031                 b.append(String.format(" /%s/", comment));
1032
1033             return b.toString();
1034         }
1035         public String getDescription() {
1036             return description;
1037         }
1038         public void setDescription(String description) {
1039             this.description = description;
1040         }
1041         public String getComment() {
1042             return comment;
1043         }
1044         public void setComment(String comment) {
1045             this.comment = comment;
1046         }
1047         @Override
1048         public ItemType getType() {
1049             return ItemType.generalData;
1050         }
1051         public LedgerTransaction asLedgerTransaction() {
1052             return new LedgerTransaction(0, (date == null) ? SimpleDate.today() : date, description,
1053                     Objects.requireNonNull(Data.getProfile()));
1054         }
1055         public boolean equalContents(TransactionHead other) {
1056             if (other == null)
1057                 return false;
1058
1059             return Objects.equals(date, other.date) &&
1060                    Misc.equalStrings(description, other.description) &&
1061                    Misc.equalStrings(comment, other.comment);
1062         }
1063     }
1064
1065     public static class TransactionAccount extends Item {
1066         private String accountName;
1067         private String amountHint;
1068         private String comment;
1069         @NotNull
1070         private String currency = "";
1071         private float amount;
1072         private boolean amountSet;
1073         private boolean amountValid = true;
1074         @NotNull
1075         private String amountText = "";
1076         private FocusedElement focusedElement = FocusedElement.Account;
1077         private boolean amountHintIsSet = false;
1078         private boolean isLast = false;
1079         private int accountNameCursorPosition;
1080         public TransactionAccount(TransactionAccount origin) {
1081             super(origin.id);
1082             accountName = origin.accountName;
1083             amount = origin.amount;
1084             amountSet = origin.amountSet;
1085             amountHint = origin.amountHint;
1086             amountHintIsSet = origin.amountHintIsSet;
1087             amountText = origin.amountText;
1088             comment = origin.comment;
1089             currency = origin.currency;
1090             amountValid = origin.amountValid;
1091             focusedElement = origin.focusedElement;
1092             isLast = origin.isLast;
1093             accountNameCursorPosition = origin.accountNameCursorPosition;
1094         }
1095         public TransactionAccount(String accountName) {
1096             super();
1097             this.accountName = accountName;
1098         }
1099         public TransactionAccount(String accountName, @NotNull String currency) {
1100             super();
1101             this.accountName = accountName;
1102             this.currency = currency;
1103         }
1104         public @NotNull String getAmountText() {
1105             return amountText;
1106         }
1107         public void setAmountText(@NotNull String amountText) {
1108             this.amountText = amountText;
1109         }
1110         public boolean setAndCheckAmountText(@NotNull String amountText) {
1111             String amtText = amountText.trim();
1112             this.amountText = amtText;
1113
1114             boolean significantChange = false;
1115
1116             if (amtText.isEmpty()) {
1117                 if (amountSet) {
1118                     significantChange = true;
1119                 }
1120                 resetAmount();
1121             }
1122             else {
1123                 try {
1124                     amtText = amtText.replace(Data.getDecimalSeparator(), Data.decimalDot);
1125                     final float parsedAmount = Float.parseFloat(amtText);
1126                     if (!amountSet || !amountValid || !Misc.equalFloats(parsedAmount, amount))
1127                         significantChange = true;
1128                     amount = parsedAmount;
1129                     amountSet = true;
1130                     amountValid = true;
1131                 }
1132                 catch (NumberFormatException e) {
1133                     Logger.debug("new-trans", String.format(
1134                             "assuming amount is not set due to number format exception. " +
1135                             "input was '%s'", amtText));
1136                     if (amountValid) // it was valid and now it's not
1137                         significantChange = true;
1138                     amountValid = false;
1139                 }
1140             }
1141
1142             return significantChange;
1143         }
1144         public boolean isLast() {
1145             return isLast;
1146         }
1147         public boolean isAmountSet() {
1148             return amountSet;
1149         }
1150         public String getAccountName() {
1151             return accountName;
1152         }
1153         public void setAccountName(String accountName) {
1154             this.accountName = accountName;
1155         }
1156         public float getAmount() {
1157             if (!amountSet)
1158                 throw new IllegalStateException("Amount is not set");
1159             return amount;
1160         }
1161         public void setAmount(float amount) {
1162             this.amount = amount;
1163             amountSet = true;
1164             amountValid = true;
1165             amountText = Data.formatNumber(amount);
1166         }
1167         public void resetAmount() {
1168             amountSet = false;
1169             amountValid = true;
1170             amountText = "";
1171         }
1172         @Override
1173         public ItemType getType() {
1174             return ItemType.transactionRow;
1175         }
1176         public String getAmountHint() {
1177             return amountHint;
1178         }
1179         public void setAmountHint(String amountHint) {
1180             this.amountHint = amountHint;
1181             amountHintIsSet = !TextUtils.isEmpty(amountHint);
1182         }
1183         public String getComment() {
1184             return comment;
1185         }
1186         public void setComment(String comment) {
1187             this.comment = comment;
1188         }
1189         @NotNull
1190         public String getCurrency() {
1191             return currency;
1192         }
1193         public void setCurrency(@org.jetbrains.annotations.Nullable String currency) {
1194             this.currency = Misc.nullIsEmpty(currency);
1195         }
1196         public boolean isAmountValid() {
1197             return amountValid;
1198         }
1199         public void setAmountValid(boolean amountValid) {
1200             this.amountValid = amountValid;
1201         }
1202         public FocusedElement getFocusedElement() {
1203             return focusedElement;
1204         }
1205         public void setFocusedElement(FocusedElement focusedElement) {
1206             this.focusedElement = focusedElement;
1207         }
1208         public boolean isAmountHintSet() {
1209             return amountHintIsSet;
1210         }
1211         public void setAmountHintIsSet(boolean amountHintIsSet) {
1212             this.amountHintIsSet = amountHintIsSet;
1213         }
1214         public boolean isEmpty() {
1215             return !amountSet && Misc.emptyIsNull(accountName) == null &&
1216                    Misc.emptyIsNull(comment) == null;
1217         }
1218         @SuppressLint("DefaultLocale")
1219         @Override
1220         @NotNull
1221         public String toString() {
1222             StringBuilder b = new StringBuilder();
1223             b.append(String.format("id:%d/%s", id, Integer.toHexString(hashCode())));
1224             if (!TextUtils.isEmpty(accountName))
1225                 b.append(String.format(" acc'%s'", accountName));
1226
1227             if (amountSet)
1228                 b.append(amountText)
1229                  .append(" [")
1230                  .append(amountValid ? "valid" : "invalid")
1231                  .append("] ")
1232                  .append(String.format(Locale.ROOT, " {raw %4.2f}", amount));
1233             else if (amountHintIsSet)
1234                 b.append(String.format(" (hint %s)", amountHint));
1235
1236             if (!TextUtils.isEmpty(currency))
1237                 b.append(" ")
1238                  .append(currency);
1239
1240             if (!TextUtils.isEmpty(comment))
1241                 b.append(String.format(" /%s/", comment));
1242
1243             if (isLast)
1244                 b.append(" last");
1245
1246             return b.toString();
1247         }
1248         public boolean equalContents(TransactionAccount other) {
1249             if (other == null)
1250                 return false;
1251
1252             boolean equal = Misc.equalStrings(accountName, other.accountName);
1253             equal = equal && Misc.equalStrings(comment, other.comment) &&
1254                     (amountSet ? other.amountSet && amountValid == other.amountValid &&
1255                                  Misc.equalStrings(amountText, other.amountText)
1256                                : !other.amountSet);
1257
1258             // compare amount hint only if there is no amount
1259             if (!amountSet)
1260                 equal = equal && (amountHintIsSet ? other.amountHintIsSet &&
1261                                                     Misc.equalStrings(amountHint, other.amountHint)
1262                                                   : !other.amountHintIsSet);
1263             equal = equal && Misc.equalStrings(currency, other.currency) && isLast == other.isLast;
1264
1265             Logger.debug("new-trans",
1266                     String.format("Comparing {%s} and {%s}: %s", this.toString(), other.toString(),
1267                             equal));
1268             return equal;
1269         }
1270         public int getAccountNameCursorPosition() {
1271             return accountNameCursorPosition;
1272         }
1273         public void setAccountNameCursorPosition(int position) {
1274             this.accountNameCursorPosition = position;
1275         }
1276     }
1277
1278     private static class BalanceForCurrency {
1279         private final HashMap<String, Float> hashMap = new HashMap<>();
1280         float get(String currencyName) {
1281             Float f = hashMap.get(currencyName);
1282             if (f == null) {
1283                 f = 0f;
1284                 hashMap.put(currencyName, f);
1285             }
1286             return f;
1287         }
1288         void add(String currencyName, float amount) {
1289             hashMap.put(currencyName, get(currencyName) + amount);
1290         }
1291         Set<String> currencies() {
1292             return hashMap.keySet();
1293         }
1294         boolean containsCurrency(String currencyName) {
1295             return hashMap.containsKey(currencyName);
1296         }
1297     }
1298
1299     private static class ItemsForCurrency {
1300         private final HashMap<@NotNull String, List<Item>> hashMap = new HashMap<>();
1301         @NonNull
1302         List<NewTransactionModel.Item> getList(@NotNull String currencyName) {
1303             List<NewTransactionModel.Item> list = hashMap.get(currencyName);
1304             if (list == null) {
1305                 list = new ArrayList<>();
1306                 hashMap.put(currencyName, list);
1307             }
1308             return list;
1309         }
1310         void add(@NotNull String currencyName, @NonNull NewTransactionModel.Item item) {
1311             getList(Objects.requireNonNull(currencyName)).add(item);
1312         }
1313         int size(@NotNull String currencyName) {
1314             return this.getList(Objects.requireNonNull(currencyName))
1315                        .size();
1316         }
1317         Set<String> currencies() {
1318             return hashMap.keySet();
1319         }
1320     }
1321 }