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     }
  84     public LiveData<Boolean> getShowCurrency() {
  85         return showCurrency;
  86     }
  87     public LiveData<List<Item>> getItems() {
  88         return items;
  89     }
  90     private void setItems(@NonNull List<Item> newList) {
  91         checkTransactionSubmittable(newList);
  92         setItemsWithoutSubmittableChecks(newList);
  93     }
  94     private void replaceItems(@NonNull List<Item> newList) {
  95         renumberItems();
  96
  97         setItems(newList);
  98     }
  99     /**
 100      * make old items replaceable in-place. makes the new values visually blend in
 101      */
 102     private void renumberItems() {
 103         renumberItems(items.getValue());
 104     }
 105     private void renumberItems(List<Item> list) {
 106         if (list == null) {
 107             return;
 108         }
 109
 110         int id = 0;
 111         for (Item item : list)
 112             item.id = id++;
 113     }
 114     private void setItemsWithoutSubmittableChecks(@NonNull List<Item> list) {
 115         final int cnt = list.size();
 116         for (int i = 1; i < cnt - 1; i++) {
 117             final TransactionAccount item = list.get(i)
 118                                                 .toTransactionAccount();
 119             if (item.isLast) {
 120                 TransactionAccount replacement = new TransactionAccount(item);
 121                 replacement.isLast = false;
 122                 list.set(i, replacement);
 123             }
 124         }
 125         final TransactionAccount last = list.get(cnt - 1)
 126                                             .toTransactionAccount();
 127         if (!last.isLast) {
 128             TransactionAccount replacement = new TransactionAccount(last);
 129             replacement.isLast = true;
 130             list.set(cnt - 1, replacement);
 131         }
 132
 133         if (BuildConfig.DEBUG)
 134             dumpItemList("Before setValue()", list);
 135         items.setValue(list);
 136     }
 137     private List<Item> copyList() {
 138         List<Item> copy = new ArrayList<>();
 139         List<Item> oldList = items.getValue();
 140
 141         if (oldList != null)
 142             for (Item item : oldList) {
 143                 copy.add(Item.from(item));
 144             }
 145
 146         return copy;
 147     }
 148     private List<Item> copyListWithoutItem(int position) {
 149         List<Item> copy = new ArrayList<>();
 150         List<Item> oldList = items.getValue();
 151
 152         if (oldList != null) {
 153             int i = 0;
 154             for (Item item : oldList) {
 155                 if (i++ == position)
 156                     continue;
 157                 copy.add(Item.from(item));
 158             }
 159         }
 160
 161         return copy;
 162     }
 163     private List<Item> shallowCopyList() {
 164         return new ArrayList<>(Objects.requireNonNull(items.getValue()));
 165     }
 166     LiveData<Boolean> getShowComments() {
 167         return showComments;
 168     }
 169     void observeDataProfile(LifecycleOwner activity) {
 170         if (!observingDataProfile)
 171             Data.observeProfile(activity, profileObserver);
 172         observingDataProfile = true;
 173     }
 174     boolean getSimulateSaveFlag() {
 175         Boolean value = simulateSave.getValue();
 176         if (value == null)
 177             return false;
 178         return value;
 179     }
 180     LiveData<Boolean> getSimulateSave() {
 181         return simulateSave;
 182     }
 183     void toggleSimulateSave() {
 184         simulateSave.setValue(!getSimulateSaveFlag());
 185     }
 186     LiveData<Boolean> isSubmittable() {
 187         return this.isSubmittable;
 188     }
 189     void reset() {
 190         Logger.debug("new-trans", "Resetting model");
 191         List<Item> list = new ArrayList<>();
 192         Item.resetIdDispenser();
 193         list.add(new TransactionHead(""));
 194         final String defaultCurrency = Objects.requireNonNull(Data.getProfile())
 195                                               .getDefaultCommodity();
 196         list.add(new TransactionAccount("", defaultCurrency));
 197         list.add(new TransactionAccount("", defaultCurrency));
 198         noteFocusChanged(0, FocusedElement.Description);
 199         renumberItems();
 200         isSubmittable.setValue(false);
 201         setItemsWithoutSubmittableChecks(list);
 202     }
 203     boolean accountsInInitialState() {
 204         final List<Item> list = items.getValue();
 205
 206         if (list == null)
 207             return true;
 208
 209         for (Item item : list) {
 210             if (!(item instanceof TransactionAccount))
 211                 continue;
 212
 213             TransactionAccount accRow = (TransactionAccount) item;
 214             if (!accRow.isEmpty())
 215                 return false;
 216         }
 217
 218         return true;
 219     }
 220     void applyTemplate(MatchedTemplate matchedTemplate, String text) {
 221         SimpleDate transactionDate = null;
 222         final MatchResult matchResult = matchedTemplate.matchResult;
 223         final TemplateHeader templateHead = matchedTemplate.templateHead;
 224         {
 225             int day = extractIntFromMatches(matchResult, templateHead.getDateDayMatchGroup(),
 226                     templateHead.getDateDay());
 227             int month = extractIntFromMatches(matchResult, templateHead.getDateMonthMatchGroup(),
 228                     templateHead.getDateMonth());
 229             int year = extractIntFromMatches(matchResult, templateHead.getDateYearMatchGroup(),
 230                     templateHead.getDateYear());
 231
 232             if (year > 0 || month > 0 || day > 0) {
 233                 SimpleDate today = SimpleDate.today();
 234                 if (year <= 0)
 235                     year = today.year;
 236                 if (month <= 0)
 237                     month = today.month;
 238                 if (day <= 0)
 239                     day = today.day;
 240
 241                 transactionDate = new SimpleDate(year, month, day);
 242
 243                 Logger.debug("pattern", "setting transaction date to " + transactionDate);
 244             }
 245         }
 246
 247         List<Item> present = copyList();
 248
 249         TransactionHead head = new TransactionHead(present.get(0)
 250                                                           .toTransactionHead());
 251         if (transactionDate != null)
 252             head.setDate(transactionDate);
 253
 254         final String transactionDescription = extractStringFromMatches(matchResult,
 255                 templateHead.getTransactionDescriptionMatchGroup(),
 256                 templateHead.getTransactionDescription());
 257         if (Misc.emptyIsNull(transactionDescription) != null)
 258             head.setDescription(transactionDescription);
 259
 260         final String transactionComment = extractStringFromMatches(matchResult,
 261                 templateHead.getTransactionCommentMatchGroup(),
 262                 templateHead.getTransactionComment());
 263         if (Misc.emptyIsNull(transactionComment) != null)
 264             head.setComment(transactionComment);
 265
 266         List<Item> newItems = new ArrayList<>();
 267
 268         newItems.add(head);
 269
 270         for (int i = 1; i < present.size(); i++) {
 271             final TransactionAccount row = present.get(i)
 272                                                   .toTransactionAccount();
 273             if (!row.isEmpty())
 274                 newItems.add(new TransactionAccount(row));
 275         }
 276
 277         DB.get()
 278           .getTemplateDAO()
 279           .getTemplateWithAccountsAsync(templateHead.getId(), entry -> {
 280               int rowIndex = 0;
 281               final boolean accountsInInitialState = accountsInInitialState();
 282               for (TemplateAccount acc : entry.accounts) {
 283                   rowIndex++;
 284
 285                   String accountName =
 286                           extractStringFromMatches(matchResult, acc.getAccountNameMatchGroup(),
 287                                   acc.getAccountName());
 288                   String accountComment =
 289                           extractStringFromMatches(matchResult, acc.getAccountCommentMatchGroup(),
 290                                   acc.getAccountComment());
 291                   Float amount = extractFloatFromMatches(matchResult, acc.getAmountMatchGroup(),
 292                           acc.getAmount());
 293                   if (amount != null && acc.getNegateAmount() != null && acc.getNegateAmount())
 294                       amount = -amount;
 295
 296                   TransactionAccount accRow = new TransactionAccount(accountName);
 297                   accRow.setComment(accountComment);
 298                   if (amount != null)
 299                       accRow.setAmount(amount);
 300                   accRow.setCurrency(
 301                           extractCurrencyFromMatches(matchResult, acc.getCurrencyMatchGroup(),
 302                                   acc.getCurrencyObject()));
 303
 304                   newItems.add(accRow);
 305               }
 306
 307               renumberItems(newItems);
 308               Misc.onMainThread(() -> replaceItems(newItems));
 309           });
 310     }
 311     @NonNull
 312     private String extractCurrencyFromMatches(MatchResult m, Integer group, Currency literal) {
 313         return Misc.nullIsEmpty(
 314                 extractStringFromMatches(m, group, (literal == null) ? "" : literal.getName()));
 315     }
 316     private int extractIntFromMatches(MatchResult m, Integer group, Integer literal) {
 317         if (literal != null)
 318             return literal;
 319
 320         if (group != null) {
 321             int grp = group;
 322             if (grp > 0 && grp <= m.groupCount())
 323                 try {
 324                     return Integer.parseInt(m.group(grp));
 325                 }
 326                 catch (NumberFormatException e) {
 327                     Logger.debug("new-trans", "Error extracting matched number", e);
 328                 }
 329         }
 330
 331         return 0;
 332     }
 333     @Nullable
 334     private String extractStringFromMatches(MatchResult m, Integer group, String literal) {
 335         if (literal != null)
 336             return literal;
 337
 338         if (group != null) {
 339             int grp = group;
 340             if (grp > 0 && grp <= m.groupCount())
 341                 return m.group(grp);
 342         }
 343
 344         return null;
 345     }
 346     private Float extractFloatFromMatches(MatchResult m, Integer group, Float literal) {
 347         if (literal != null)
 348             return literal;
 349
 350         if (group != null) {
 351             int grp = group;
 352             if (grp > 0 && grp <= m.groupCount())
 353                 try {
 354                     return Float.valueOf(m.group(grp));
 355                 }
 356                 catch (NumberFormatException e) {
 357                     Logger.debug("new-trans", "Error extracting matched number", e);
 358                 }
 359         }
 360
 361         return null;
 362     }
 363     void removeItem(int pos) {
 364         Logger.debug("new-trans", String.format(Locale.US, "Removing item at position %d", pos));
 365         List<Item> newList = copyListWithoutItem(pos);
 366         final FocusInfo fi = focusInfo.getValue();
 367         if ((fi != null) && (pos < fi.position))
 368             noteFocusChanged(fi.position - 1, fi.element);
 369         setItems(newList);
 370     }
 371     void noteFocusChanged(int position, FocusedElement element) {
 372         FocusInfo present = focusInfo.getValue();
 373         if (present == null || present.position != position || present.element != element)
 374             focusInfo.setValue(new FocusInfo(position, element));
 375     }
 376     public LiveData<FocusInfo> getFocusInfo() {
 377         return focusInfo;
 378     }
 379     void moveItem(int fromIndex, int toIndex) {
 380         List<Item> newList = shallowCopyList();
 381         Item item = newList.remove(fromIndex);
 382         newList.add(toIndex, item);
 383
 384         FocusInfo fi = focusInfo.getValue();
 385         if (fi != null && fi.position == fromIndex)
 386             noteFocusChanged(toIndex, fi.element);
 387
 388         items.setValue(newList); // same count, same submittable state
 389     }
 390     void moveItemLast(List<Item> list, int index) {
 391         /*   0
 392              1   <-- index
 393              2
 394              3   <-- desired position
 395                  (no bottom filler)
 396          */
 397         int itemCount = list.size();
 398
 399         if (index < itemCount - 1)
 400             list.add(list.remove(index));
 401     }
 402     void toggleCurrencyVisible() {
 403         final boolean newValue = !Objects.requireNonNull(showCurrency.getValue());
 404
 405         // remove currency from all items, or reset currency to the default
 406         // no need to clone the list, because the removal of the currency won't lead to
 407         // visual changes -- the currency fields will be hidden or reset to default anyway
 408         // still, there may be changes in the submittable state
 409         final List<Item> list = Objects.requireNonNull(this.items.getValue());
 410         final Profile profile = Objects.requireNonNull(Data.getProfile());
 411         for (int i = 1; i < list.size(); i++) {
 412             ((TransactionAccount) list.get(i)).setCurrency(
 413                     newValue ? profile.getDefaultCommodity() : "");
 414         }
 415         checkTransactionSubmittable(null);
 416         showCurrency.setValue(newValue);
 417     }
 418     void stopObservingBusyFlag(Observer<Boolean> observer) {
 419         busyFlag.removeObserver(observer);
 420     }
 421     void incrementBusyCounter() {
 422         int newValue = busyCounter.incrementAndGet();
 423         if (newValue == 1)
 424             busyFlag.postValue(true);
 425     }
 426     void decrementBusyCounter() {
 427         int newValue = busyCounter.decrementAndGet();
 428         if (newValue == 0)
 429             busyFlag.postValue(false);
 430     }
 431     public LiveData<Boolean> getBusyFlag() {
 432         return busyFlag;
 433     }
 434     public void toggleShowComments() {
 435         showComments.setValue(!Objects.requireNonNull(showComments.getValue()));
 436     }
 437     public LedgerTransaction constructLedgerTransaction() {
 438         List<Item> list = Objects.requireNonNull(items.getValue());
 439         TransactionHead head = list.get(0)
 440                                    .toTransactionHead();
 441         LedgerTransaction tr = head.asLedgerTransaction();
 442
 443         tr.setComment(head.getComment());
 444         LedgerTransactionAccount emptyAmountAccount = null;
 445         float emptyAmountAccountBalance = 0;
 446         for (int i = 1; i < list.size(); i++) {
 447             TransactionAccount item = list.get(i)
 448                                           .toTransactionAccount();
 449             LedgerTransactionAccount acc = new LedgerTransactionAccount(item.getAccountName()
 450                                                                             .trim(),
 451                     item.getCurrency());
 452             if (acc.getAccountName()
 453                    .isEmpty())
 454                 continue;
 455
 456             acc.setComment(item.getComment());
 457
 458             if (item.isAmountSet()) {
 459                 acc.setAmount(item.getAmount());
 460                 emptyAmountAccountBalance += item.getAmount();
 461             }
 462             else {
 463                 emptyAmountAccount = acc;
 464             }
 465
 466             tr.addAccount(acc);
 467         }
 468
 469         if (emptyAmountAccount != null)
 470             emptyAmountAccount.setAmount(-emptyAmountAccountBalance);
 471
 472         return tr;
 473     }
 474     void loadTransactionIntoModel(@NonNull TransactionWithAccounts tr) {
 475         List<Item> newList = new ArrayList<>();
 476         Item.resetIdDispenser();
 477
 478         Item currentHead = Objects.requireNonNull(items.getValue())
 479                                   .get(0);
 480         TransactionHead head = new TransactionHead(tr.transaction.getDescription());
 481         head.setComment(tr.transaction.getComment());
 482         if (currentHead instanceof TransactionHead)
 483             head.setDate(((TransactionHead) currentHead).date);
 484
 485         newList.add(head);
 486
 487         List<LedgerTransactionAccount> accounts = new ArrayList<>();
 488         for (net.ktnx.mobileledger.db.TransactionAccount acc : tr.accounts) {
 489             accounts.add(new LedgerTransactionAccount(acc));
 490         }
 491
 492         TransactionAccount firstNegative = null;
 493         TransactionAccount firstPositive = null;
 494         int singleNegativeIndex = -1;
 495         int singlePositiveIndex = -1;
 496         int negativeCount = 0;
 497         for (int i = 0; i < accounts.size(); i++) {
 498             LedgerTransactionAccount acc = accounts.get(i);
 499             TransactionAccount item = new TransactionAccount(acc.getAccountName(),
 500                     Misc.nullIsEmpty(acc.getCurrency()));
 501             newList.add(item);
 502
 503             item.setAccountName(acc.getAccountName());
 504             item.setComment(acc.getComment());
 505             if (acc.isAmountSet()) {
 506                 item.setAmount(acc.getAmount());
 507                 if (acc.getAmount() < 0) {
 508                     if (firstNegative == null) {
 509                         firstNegative = item;
 510                         singleNegativeIndex = i + 1;
 511                     }
 512                     else
 513                         singleNegativeIndex = -1;
 514                 }
 515                 else {
 516                     if (firstPositive == null) {
 517                         firstPositive = item;
 518                         singlePositiveIndex = i + 1;
 519                     }
 520                     else
 521                         singlePositiveIndex = -1;
 522                 }
 523             }
 524             else
 525                 item.resetAmount();
 526         }
 527         if (BuildConfig.DEBUG)
 528             dumpItemList("Loaded previous transaction", newList);
 529
 530         if (singleNegativeIndex != -1) {
 531             firstNegative.resetAmount();
 532             moveItemLast(newList, singleNegativeIndex);
 533         }
 534         else if (singlePositiveIndex != -1) {
 535             firstPositive.resetAmount();
 536             moveItemLast(newList, singlePositiveIndex);
 537         }
 538
 539         Misc.onMainThread(() -> {
 540             setItems(newList);
 541             noteFocusChanged(1, FocusedElement.Amount);
 542         });
 543     }
 544     /**
 545      * A transaction is submittable if:
 546      * 0) has description
 547      * 1) has at least two account names
 548      * 2) each row with amount has account name
 549      * 3) for each commodity:
 550      * 3a) amounts must balance to 0, or
 551      * 3b) there must be exactly one empty amount (with account)
 552      * 4) empty accounts with empty amounts are ignored
 553      * Side effects:
 554      * 5) a row with an empty account name or empty amount is guaranteed to exist for each
 555      * commodity
 556      * 6) at least two rows need to be present in the ledger
 557      *
 558      * @param list - the item list to check. Can be the displayed list or a list that will be
 559      *             displayed soon
 560      */
 561     @SuppressLint("DefaultLocale")
 562     void checkTransactionSubmittable(@Nullable List<Item> list) {
 563         boolean workingWithLiveList = false;
 564         if (list == null) {
 565             list = copyList();
 566             workingWithLiveList = true;
 567         }
 568
 569         if (BuildConfig.DEBUG)
 570             dumpItemList(String.format("Before submittable checks (%s)",
 571                     workingWithLiveList ? "LIVE LIST" : "custom list"), list);
 572
 573         int accounts = 0;
 574         final BalanceForCurrency balance = new BalanceForCurrency();
 575         final String descriptionText = list.get(0)
 576                                            .toTransactionHead()
 577                                            .getDescription();
 578         boolean submittable = true;
 579         boolean listChanged = false;
 580         final ItemsForCurrency itemsForCurrency = new ItemsForCurrency();
 581         final ItemsForCurrency itemsWithEmptyAmountForCurrency = new ItemsForCurrency();
 582         final ItemsForCurrency itemsWithAccountAndEmptyAmountForCurrency = new ItemsForCurrency();
 583         final ItemsForCurrency itemsWithEmptyAccountForCurrency = new ItemsForCurrency();
 584         final ItemsForCurrency itemsWithAmountForCurrency = new ItemsForCurrency();
 585         final ItemsForCurrency itemsWithAccountForCurrency = new ItemsForCurrency();
 586         final ItemsForCurrency emptyRowsForCurrency = new ItemsForCurrency();
 587         final List<Item> emptyRows = new ArrayList<>();
 588
 589         try {
 590             if ((descriptionText == null) || descriptionText.trim()
 591                                                             .isEmpty())
 592             {
 593                 Logger.debug("submittable", "Transaction not submittable: missing description");
 594                 submittable = false;
 595             }
 596
 597             boolean hasInvalidAmount = false;
 598
 599             for (int i = 1; i < list.size(); i++) {
 600                 TransactionAccount item = list.get(i)
 601                                               .toTransactionAccount();
 602
 603                 String accName = item.getAccountName()
 604                                      .trim();
 605                 String currName = item.getCurrency();
 606
 607                 itemsForCurrency.add(currName, item);
 608
 609                 if (accName.isEmpty()) {
 610                     itemsWithEmptyAccountForCurrency.add(currName, item);
 611
 612                     if (item.isAmountSet()) {
 613                         // 2) each amount has account name
 614                         Logger.debug("submittable", String.format(
 615                                 "Transaction not submittable: row %d has no account name, but" +
 616                                 " has" + " amount %1.2f", i + 1, item.getAmount()));
 617                         submittable = false;
 618                     }
 619                     else {
 620                         emptyRowsForCurrency.add(currName, item);
 621                     }
 622                 }
 623                 else {
 624                     accounts++;
 625                     itemsWithAccountForCurrency.add(currName, item);
 626                 }
 627
 628                 if (item.isAmountSet() && item.isAmountValid()) {
 629                     itemsWithAmountForCurrency.add(currName, item);
 630                     balance.add(currName, item.getAmount());
 631                 }
 632                 else {
 633                     if (!item.isAmountValid()) {
 634                         Logger.debug("submittable",
 635                                 String.format("Not submittable: row %d has an invalid amount", i));
 636                         submittable = false;
 637                         hasInvalidAmount = true;
 638                     }
 639
 640                     itemsWithEmptyAmountForCurrency.add(currName, item);
 641
 642                     if (!accName.isEmpty())
 643                         itemsWithAccountAndEmptyAmountForCurrency.add(currName, item);
 644                 }
 645             }
 646
 647             // 1) has at least two account names
 648             if (accounts < 2) {
 649                 if (accounts == 0)
 650                     Logger.debug("submittable", "Transaction not submittable: no account names");
 651                 else if (accounts == 1)
 652                     Logger.debug("submittable",
 653                             "Transaction not submittable: only one account name");
 654                 else
 655                     Logger.debug("submittable",
 656                             String.format("Transaction not submittable: only %d account names",
 657                                     accounts));
 658                 submittable = false;
 659             }
 660
 661             // 3) for each commodity:
 662             // 3a) amount must balance to 0, or
 663             // 3b) there must be exactly one empty amount (with account)
 664             for (String balCurrency : itemsForCurrency.currencies()) {
 665                 float currencyBalance = balance.get(balCurrency);
 666                 if (Misc.isZero(currencyBalance)) {
 667                     // remove hints from all amount inputs in that currency
 668                     for (int i = 1; i < list.size(); i++) {
 669                         TransactionAccount acc = list.get(i)
 670                                                      .toTransactionAccount();
 671                         if (Misc.equalStrings(acc.getCurrency(), balCurrency)) {
 672                             if (BuildConfig.DEBUG)
 673                                 Logger.debug("submittable",
 674                                         String.format(Locale.US, "Resetting hint of %d:'%s' [%s]",
 675                                                 i, Misc.nullIsEmpty(acc.getAccountName()),
 676                                                 balCurrency));
 677                             // skip if the amount is set, in which case the hint is not
 678                             // important/visible
 679                             if (!acc.isAmountSet() && acc.amountHintIsSet &&
 680                                 !TextUtils.isEmpty(acc.getAmountHint()))
 681                             {
 682                                 acc.setAmountHint(null);
 683                                 listChanged = true;
 684                             }
 685                         }
 686                     }
 687                 }
 688                 else {
 689                     List<Item> tmpList =
 690                             itemsWithAccountAndEmptyAmountForCurrency.getList(balCurrency);
 691                     int balanceReceiversCount = tmpList.size();
 692                     if (balanceReceiversCount != 1) {
 693                         if (BuildConfig.DEBUG) {
 694                             if (balanceReceiversCount == 0)
 695                                 Logger.debug("submittable", String.format(
 696                                         "Transaction not submittable [curr:%s]: non-zero balance " +
 697                                         "with no empty amounts with accounts", balCurrency));
 698                             else
 699                                 Logger.debug("submittable", String.format(
 700                                         "Transaction not submittable [curr:%s]: non-zero balance " +
 701                                         "with multiple empty amounts with accounts", balCurrency));
 702                         }
 703                         submittable = false;
 704                     }
 705
 706                     List<Item> emptyAmountList =
 707                             itemsWithEmptyAmountForCurrency.getList(balCurrency);
 708
 709                     // suggest off-balance amount to a row and remove hints on other rows
 710                     Item receiver = null;
 711                     if (!tmpList.isEmpty())
 712                         receiver = tmpList.get(0);
 713                     else if (!emptyAmountList.isEmpty())
 714                         receiver = emptyAmountList.get(0);
 715
 716                     for (int i = 0; i < list.size(); i++) {
 717                         Item item = list.get(i);
 718                         if (!(item instanceof TransactionAccount))
 719                             continue;
 720
 721                         TransactionAccount acc = item.toTransactionAccount();
 722                         if (!Misc.equalStrings(acc.getCurrency(), balCurrency))
 723                             continue;
 724
 725                         if (item == receiver) {
 726                             final String hint = Data.formatNumber(-currencyBalance);
 727                             if (!acc.isAmountHintSet() ||
 728                                 !Misc.equalStrings(acc.getAmountHint(), hint))
 729                             {
 730                                 Logger.debug("submittable",
 731                                         String.format("Setting amount hint of {%s} to %s [%s]",
 732                                                 acc.toString(), hint, balCurrency));
 733                                 acc.setAmountHint(hint);
 734                                 listChanged = true;
 735                             }
 736                         }
 737                         else {
 738                             if (BuildConfig.DEBUG)
 739                                 Logger.debug("submittable",
 740                                         String.format("Resetting hint of '%s' [%s]",
 741                                                 Misc.nullIsEmpty(acc.getAccountName()),
 742                                                 balCurrency));
 743                             if (acc.amountHintIsSet && !TextUtils.isEmpty(acc.getAmountHint())) {
 744                                 acc.setAmountHint(null);
 745                                 listChanged = true;
 746                             }
 747                         }
 748                     }
 749                 }
 750             }
 751
 752             // 5) a row with an empty account name or empty amount is guaranteed to exist for
 753             // each commodity
 754             if (!hasInvalidAmount) {
 755                 for (String balCurrency : balance.currencies()) {
 756                     int currEmptyRows = itemsWithEmptyAccountForCurrency.size(balCurrency);
 757                     int currRows = itemsForCurrency.size(balCurrency);
 758                     int currAccounts = itemsWithAccountForCurrency.size(balCurrency);
 759                     int currAmounts = itemsWithAmountForCurrency.size(balCurrency);
 760                     if ((currEmptyRows == 0) &&
 761                         ((currRows == currAccounts) || (currRows == currAmounts)))
 762                     {
 763                         // perhaps there already is an unused empty row for another currency that
 764                         // is not used?
 765 //                        boolean foundIt = false;
 766 //                        for (Item item : emptyRows) {
 767 //                            Currency itemCurrency = item.getCurrency();
 768 //                            String itemCurrencyName =
 769 //                                    (itemCurrency == null) ? "" : itemCurrency.getName();
 770 //                            if (Misc.isZero(balance.get(itemCurrencyName))) {
 771 //                                item.setCurrency(Currency.loadByName(balCurrency));
 772 //                                item.setAmountHint(
 773 //                                        Data.formatNumber(-balance.get(balCurrency)));
 774 //                                foundIt = true;
 775 //                                break;
 776 //                            }
 777 //                        }
 778 //
 779 //                        if (!foundIt)
 780                         final TransactionAccount newAcc = new TransactionAccount("", balCurrency);
 781                         final float bal = balance.get(balCurrency);
 782                         if (!Misc.isZero(bal) && currAmounts == currRows)
 783                             newAcc.setAmountHint(Data.formatNumber(-bal));
 784                         Logger.debug("submittable",
 785                                 String.format("Adding new item with %s for currency %s",
 786                                         newAcc.getAmountHint(), balCurrency));
 787                         list.add(newAcc);
 788                         listChanged = true;
 789                     }
 790                 }
 791             }
 792
 793             // drop extra empty rows, not needed
 794             for (String currName : emptyRowsForCurrency.currencies()) {
 795                 List<Item> emptyItems = emptyRowsForCurrency.getList(currName);
 796                 while ((list.size() > MIN_ITEMS) && (emptyItems.size() > 1)) {
 797                     // the list is a copy, so the empty item is no longer present
 798                     Item itemToRemove = emptyItems.remove(1);
 799                     removeItemById(list, itemToRemove.id);
 800                     listChanged = true;
 801                 }
 802
 803                 // unused currency, remove last item (which is also an empty one)
 804                 if ((list.size() > MIN_ITEMS) && (emptyItems.size() == 1)) {
 805                     List<Item> currItems = itemsForCurrency.getList(currName);
 806
 807                     if (currItems.size() == 1) {
 808                         // the list is a copy, so the empty item is no longer present
 809                         removeItemById(list, emptyItems.get(0).id);
 810                         listChanged = true;
 811                     }
 812                 }
 813             }
 814
 815             // 6) at least two rows need to be present in the ledger
 816             //    (the list also contains header and trailer)
 817             while (list.size() < MIN_ITEMS) {
 818                 list.add(new TransactionAccount(""));
 819                 listChanged = true;
 820             }
 821
 822             Logger.debug("submittable", submittable ? "YES" : "NO");
 823             isSubmittable.setValue(submittable);
 824
 825             if (BuildConfig.DEBUG)
 826                 dumpItemList("After submittable checks", list);
 827         }
 828         catch (NumberFormatException e) {
 829             Logger.debug("submittable", "NO (because of NumberFormatException)");
 830             isSubmittable.setValue(false);
 831         }
 832         catch (Exception e) {
 833             e.printStackTrace();
 834             Logger.debug("submittable", "NO (because of an Exception)");
 835             isSubmittable.setValue(false);
 836         }
 837
 838         if (listChanged && workingWithLiveList) {
 839             setItemsWithoutSubmittableChecks(list);
 840         }
 841     }
 842     private void removeItemById(@NotNull List<Item> list, int id) {
 843         if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
 844             list.removeIf(item -> item.id == id);
 845         }
 846         else {
 847             for (Item item : list) {
 848                 if (item.id == id) {
 849                     list.remove(item);
 850                     break;
 851                 }
 852             }
 853         }
 854     }
 855     @SuppressLint("DefaultLocale")
 856     private void dumpItemList(@NotNull String msg, @NotNull List<Item> list) {
 857         Logger.debug("submittable", "== Dump of all items " + msg);
 858         for (int i = 1; i < list.size(); i++) {
 859             TransactionAccount item = list.get(i)
 860                                           .toTransactionAccount();
 861             Logger.debug("submittable", String.format("%d:%s", i, item.toString()));
 862         }
 863     }
 864     public void setItemCurrency(int position, String newCurrency) {
 865         TransactionAccount item = Objects.requireNonNull(items.getValue())
 866                                          .get(position)
 867                                          .toTransactionAccount();
 868         final String oldCurrency = item.getCurrency();
 869
 870         if (Misc.equalStrings(oldCurrency, newCurrency))
 871             return;
 872
 873         List<Item> newList = copyList();
 874         newList.get(position)
 875                .toTransactionAccount()
 876                .setCurrency(newCurrency);
 877
 878         setItems(newList);
 879     }
 880     public boolean accountListIsEmpty() {
 881         List<Item> items = Objects.requireNonNull(this.items.getValue());
 882
 883         for (Item item : items) {
 884             if (!(item instanceof TransactionAccount))
 885                 continue;
 886
 887             if (!((TransactionAccount) item).isEmpty())
 888                 return false;
 889         }
 890
 891         return true;
 892     }
 893
 894     public static class FocusInfo {
 895         int position;
 896         FocusedElement element;
 897         public FocusInfo(int position, FocusedElement element) {
 898             this.position = position;
 899             this.element = element;
 900         }
 901     }
 902
 903     static abstract class Item {
 904         private static int idDispenser = 0;
 905         protected int id;
 906         private Item() {
 907             if (this instanceof TransactionHead)
 908                 id = 0;
 909             else
 910                 synchronized (Item.class) {
 911                     id = ++idDispenser;
 912                 }
 913         }
 914         public Item(int id) {
 915             this.id = id;
 916         }
 917         public static Item from(Item origin) {
 918             if (origin instanceof TransactionHead)
 919                 return new TransactionHead((TransactionHead) origin);
 920             if (origin instanceof TransactionAccount)
 921                 return new TransactionAccount((TransactionAccount) origin);
 922             throw new RuntimeException("Don't know how to handle " + origin);
 923         }
 924         private static void resetIdDispenser() {
 925             idDispenser = 0;
 926         }
 927         public int getId() {
 928             return id;
 929         }
 930         public abstract ItemType getType();
 931         public TransactionHead toTransactionHead() {
 932             if (this instanceof TransactionHead)
 933                 return (TransactionHead) this;
 934
 935             throw new IllegalStateException("Wrong item type " + this);
 936         }
 937         public TransactionAccount toTransactionAccount() {
 938             if (this instanceof TransactionAccount)
 939                 return (TransactionAccount) this;
 940
 941             throw new IllegalStateException("Wrong item type " + this);
 942         }
 943         public boolean equalContents(@Nullable Object item) {
 944             if (item == null)
 945                 return false;
 946
 947             if (!getClass().equals(item.getClass()))
 948                 return false;
 949
 950             // shortcut - comparing same instance
 951             if (item == this)
 952                 return true;
 953
 954             if (this instanceof TransactionHead)
 955                 return ((TransactionHead) item).equalContents((TransactionHead) this);
 956             if (this instanceof TransactionAccount)
 957                 return ((TransactionAccount) item).equalContents((TransactionAccount) this);
 958
 959             throw new RuntimeException("Don't know how to handle " + this);
 960         }
 961     }
 962
 963
 964 //==========================================================================================
 965
 966     public static class TransactionHead extends Item {
 967         private SimpleDate date;
 968         private String description;
 969         private String comment;
 970         TransactionHead(String description) {
 971             super();
 972             this.description = description;
 973         }
 974         public TransactionHead(TransactionHead origin) {
 975             super(origin.id);
 976             date = origin.date;
 977             description = origin.description;
 978             comment = origin.comment;
 979         }
 980         public SimpleDate getDate() {
 981             return date;
 982         }
 983         public void setDate(SimpleDate date) {
 984             this.date = date;
 985         }
 986         public void setDate(String text) throws ParseException {
 987             if (Misc.emptyIsNull(text) == null) {
 988                 date = null;
 989                 return;
 990             }
 991
 992             date = Globals.parseLedgerDate(text);
 993         }
 994         /**
 995          * getFormattedDate()
 996          *
 997          * @return nicely formatted, shortest available date representation
 998          */
 999         String getFormattedDate() {
1000             if (date == null)
1001                 return null;
1002
1003             Calendar today = GregorianCalendar.getInstance();
1004
1005             if (today.get(Calendar.YEAR) != date.year) {
1006                 return String.format(Locale.US, "%d/%02d/%02d", date.year, date.month, date.day);
1007             }
1008
1009             if (today.get(Calendar.MONTH) + 1 != date.month) {
1010                 return String.format(Locale.US, "%d/%02d", date.month, date.day);
1011             }
1012
1013             return String.valueOf(date.day);
1014         }
1015         @NonNull
1016         @Override
1017         public String toString() {
1018             @SuppressLint("DefaultLocale") StringBuilder b = new StringBuilder(
1019                     String.format("id:%d/%s", id, Integer.toHexString(hashCode())));
1020
1021             if (TextUtils.isEmpty(description))
1022                 b.append(" «no description»");
1023             else
1024                 b.append(String.format(" '%s'", description));
1025
1026             if (date != null)
1027                 b.append(String.format("@%s", date.toString()));
1028
1029             if (!TextUtils.isEmpty(comment))
1030                 b.append(String.format(" /%s/", comment));
1031
1032             return b.toString();
1033         }
1034         public String getDescription() {
1035             return description;
1036         }
1037         public void setDescription(String description) {
1038             this.description = description;
1039         }
1040         public String getComment() {
1041             return comment;
1042         }
1043         public void setComment(String comment) {
1044             this.comment = comment;
1045         }
1046         @Override
1047         public ItemType getType() {
1048             return ItemType.generalData;
1049         }
1050         public LedgerTransaction asLedgerTransaction() {
1051             return new LedgerTransaction(0, (date == null) ? SimpleDate.today() : date, description,
1052                     Objects.requireNonNull(Data.getProfile()));
1053         }
1054         public boolean equalContents(TransactionHead other) {
1055             if (other == null)
1056                 return false;
1057
1058             return Objects.equals(date, other.date) &&
1059                    Misc.equalStrings(description, other.description) &&
1060                    Misc.equalStrings(comment, other.comment);
1061         }
1062     }
1063
1064     public static class TransactionAccount extends Item {
1065         private String accountName;
1066         private String amountHint;
1067         private String comment;
1068         @NotNull
1069         private String currency = "";
1070         private float amount;
1071         private boolean amountSet;
1072         private boolean amountValid = true;
1073         @NotNull
1074         private String amountText = "";
1075         private FocusedElement focusedElement = FocusedElement.Account;
1076         private boolean amountHintIsSet = false;
1077         private boolean isLast = false;
1078         private int accountNameCursorPosition;
1079         public TransactionAccount(TransactionAccount origin) {
1080             super(origin.id);
1081             accountName = origin.accountName;
1082             amount = origin.amount;
1083             amountSet = origin.amountSet;
1084             amountHint = origin.amountHint;
1085             amountHintIsSet = origin.amountHintIsSet;
1086             amountText = origin.amountText;
1087             comment = origin.comment;
1088             currency = origin.currency;
1089             amountValid = origin.amountValid;
1090             focusedElement = origin.focusedElement;
1091             isLast = origin.isLast;
1092             accountNameCursorPosition = origin.accountNameCursorPosition;
1093         }
1094         public TransactionAccount(String accountName) {
1095             super();
1096             this.accountName = accountName;
1097         }
1098         public TransactionAccount(String accountName, @NotNull String currency) {
1099             super();
1100             this.accountName = accountName;
1101             this.currency = currency;
1102         }
1103         public @NotNull String getAmountText() {
1104             return amountText;
1105         }
1106         public void setAmountText(@NotNull String amountText) {
1107             this.amountText = amountText;
1108         }
1109         public boolean setAndCheckAmountText(@NotNull String amountText) {
1110             String amtText = amountText.trim();
1111             this.amountText = amtText;
1112
1113             boolean significantChange = false;
1114
1115             if (amtText.isEmpty()) {
1116                 if (amountSet) {
1117                     significantChange = true;
1118                 }
1119                 resetAmount();
1120             }
1121             else {
1122                 try {
1123                     amtText = amtText.replace(Data.getDecimalSeparator(), Data.decimalDot);
1124                     final float parsedAmount = Float.parseFloat(amtText);
1125                     if (!amountSet || !amountValid || !Misc.equalFloats(parsedAmount, amount))
1126                         significantChange = true;
1127                     amount = parsedAmount;
1128                     amountSet = true;
1129                     amountValid = true;
1130                 }
1131                 catch (NumberFormatException e) {
1132                     Logger.debug("new-trans", String.format(
1133                             "assuming amount is not set due to number format exception. " +
1134                             "input was '%s'", amtText));
1135                     if (amountValid) // it was valid and now it's not
1136                         significantChange = true;
1137                     amountValid = false;
1138                 }
1139             }
1140
1141             return significantChange;
1142         }
1143         public boolean isLast() {
1144             return isLast;
1145         }
1146         public boolean isAmountSet() {
1147             return amountSet;
1148         }
1149         public String getAccountName() {
1150             return accountName;
1151         }
1152         public void setAccountName(String accountName) {
1153             this.accountName = accountName;
1154         }
1155         public float getAmount() {
1156             if (!amountSet)
1157                 throw new IllegalStateException("Amount is not set");
1158             return amount;
1159         }
1160         public void setAmount(float amount) {
1161             this.amount = amount;
1162             amountSet = true;
1163             amountValid = true;
1164             amountText = Data.formatNumber(amount);
1165         }
1166         public void resetAmount() {
1167             amountSet = false;
1168             amountValid = true;
1169             amountText = "";
1170         }
1171         @Override
1172         public ItemType getType() {
1173             return ItemType.transactionRow;
1174         }
1175         public String getAmountHint() {
1176             return amountHint;
1177         }
1178         public void setAmountHint(String amountHint) {
1179             this.amountHint = amountHint;
1180             amountHintIsSet = !TextUtils.isEmpty(amountHint);
1181         }
1182         public String getComment() {
1183             return comment;
1184         }
1185         public void setComment(String comment) {
1186             this.comment = comment;
1187         }
1188         @NotNull
1189         public String getCurrency() {
1190             return currency;
1191         }
1192         public void setCurrency(@org.jetbrains.annotations.Nullable String currency) {
1193             this.currency = Misc.nullIsEmpty(currency);
1194         }
1195         public boolean isAmountValid() {
1196             return amountValid;
1197         }
1198         public void setAmountValid(boolean amountValid) {
1199             this.amountValid = amountValid;
1200         }
1201         public FocusedElement getFocusedElement() {
1202             return focusedElement;
1203         }
1204         public void setFocusedElement(FocusedElement focusedElement) {
1205             this.focusedElement = focusedElement;
1206         }
1207         public boolean isAmountHintSet() {
1208             return amountHintIsSet;
1209         }
1210         public void setAmountHintIsSet(boolean amountHintIsSet) {
1211             this.amountHintIsSet = amountHintIsSet;
1212         }
1213         public boolean isEmpty() {
1214             return !amountSet && Misc.emptyIsNull(accountName) == null &&
1215                    Misc.emptyIsNull(comment) == null;
1216         }
1217         @SuppressLint("DefaultLocale")
1218         @Override
1219         @NotNull
1220         public String toString() {
1221             StringBuilder b = new StringBuilder();
1222             b.append(String.format("id:%d/%s", id, Integer.toHexString(hashCode())));
1223             if (!TextUtils.isEmpty(accountName))
1224                 b.append(String.format(" acc'%s'", accountName));
1225
1226             if (amountSet)
1227                 b.append(amountText)
1228                  .append(" [")
1229                  .append(amountValid ? "valid" : "invalid")
1230                  .append("] ")
1231                  .append(String.format(Locale.ROOT, " {raw %4.2f}", amount));
1232             else if (amountHintIsSet)
1233                 b.append(String.format(" (hint %s)", amountHint));
1234
1235             if (!TextUtils.isEmpty(currency))
1236                 b.append(" ")
1237                  .append(currency);
1238
1239             if (!TextUtils.isEmpty(comment))
1240                 b.append(String.format(" /%s/", comment));
1241
1242             if (isLast)
1243                 b.append(" last");
1244
1245             return b.toString();
1246         }
1247         public boolean equalContents(TransactionAccount other) {
1248             if (other == null)
1249                 return false;
1250
1251             boolean equal = Misc.equalStrings(accountName, other.accountName);
1252             equal = equal && Misc.equalStrings(comment, other.comment) &&
1253                     (amountSet ? other.amountSet && amountValid == other.amountValid &&
1254                                  Misc.equalStrings(amountText, other.amountText)
1255                                : !other.amountSet);
1256
1257             // compare amount hint only if there is no amount
1258             if (!amountSet)
1259                 equal = equal && (amountHintIsSet ? other.amountHintIsSet &&
1260                                                     Misc.equalStrings(amountHint, other.amountHint)
1261                                                   : !other.amountHintIsSet);
1262             equal = equal && Misc.equalStrings(currency, other.currency) && isLast == other.isLast;
1263
1264             Logger.debug("new-trans",
1265                     String.format("Comparing {%s} and {%s}: %s", this.toString(), other.toString(),
1266                             equal));
1267             return equal;
1268         }
1269         public int getAccountNameCursorPosition() {
1270             return accountNameCursorPosition;
1271         }
1272         public void setAccountNameCursorPosition(int position) {
1273             this.accountNameCursorPosition = position;
1274         }
1275     }
1276
1277     private static class BalanceForCurrency {
1278         private final HashMap<String, Float> hashMap = new HashMap<>();
1279         float get(String currencyName) {
1280             Float f = hashMap.get(currencyName);
1281             if (f == null) {
1282                 f = 0f;
1283                 hashMap.put(currencyName, f);
1284             }
1285             return f;
1286         }
1287         void add(String currencyName, float amount) {
1288             hashMap.put(currencyName, get(currencyName) + amount);
1289         }
1290         Set<String> currencies() {
1291             return hashMap.keySet();
1292         }
1293         boolean containsCurrency(String currencyName) {
1294             return hashMap.containsKey(currencyName);
1295         }
1296     }
1297
1298     private static class ItemsForCurrency {
1299         private final HashMap<@NotNull String, List<Item>> hashMap = new HashMap<>();
1300         @NonNull
1301         List<NewTransactionModel.Item> getList(@NotNull String currencyName) {
1302             List<NewTransactionModel.Item> list = hashMap.get(currencyName);
1303             if (list == null) {
1304                 list = new ArrayList<>();
1305                 hashMap.put(currencyName, list);
1306             }
1307             return list;
1308         }
1309         void add(@NotNull String currencyName, @NonNull NewTransactionModel.Item item) {
1310             getList(Objects.requireNonNull(currencyName)).add(item);
1311         }
1312         int size(@NotNull String currencyName) {
1313             return this.getList(Objects.requireNonNull(currencyName))
1314                        .size();
1315         }
1316         Set<String> currencies() {
1317             return hashMap.keySet();
1318         }
1319     }
1320 }