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

   1 /*
   2  * Copyright © 2021 Damyan Ivanov.
   3  * This file is part of MoLe.
   4  * MoLe is free software: you can distribute it and/or modify it
   5  * under the term of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your opinion), any later version.
   8  *
   9  * MoLe is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License terms for details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with MoLe. If not, see <https://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.ktnx.mobileledger.ui.new_transaction;
  19
  20 import android.annotation.SuppressLint;
  21 import android.os.Handler;
  22 import android.os.Looper;
  23 import android.text.TextUtils;
  24
  25 import androidx.annotation.NonNull;
  26 import androidx.annotation.Nullable;
  27 import androidx.lifecycle.LifecycleOwner;
  28 import androidx.lifecycle.LiveData;
  29 import androidx.lifecycle.MutableLiveData;
  30 import androidx.lifecycle.Observer;
  31 import androidx.lifecycle.ViewModel;
  32
  33 import net.ktnx.mobileledger.BuildConfig;
  34 import net.ktnx.mobileledger.db.DB;
  35 import net.ktnx.mobileledger.db.TemplateAccount;
  36 import net.ktnx.mobileledger.db.TemplateHeader;
  37 import net.ktnx.mobileledger.model.Data;
  38 import net.ktnx.mobileledger.model.InertMutableLiveData;
  39 import net.ktnx.mobileledger.model.LedgerTransaction;
  40 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  41 import net.ktnx.mobileledger.model.MatchedTemplate;
  42 import net.ktnx.mobileledger.model.MobileLedgerProfile;
  43 import net.ktnx.mobileledger.utils.Globals;
  44 import net.ktnx.mobileledger.utils.Logger;
  45 import net.ktnx.mobileledger.utils.Misc;
  46 import net.ktnx.mobileledger.utils.SimpleDate;
  47
  48 import org.jetbrains.annotations.NotNull;
  49
  50 import java.text.ParseException;
  51 import java.util.ArrayList;
  52 import java.util.Calendar;
  53 import java.util.GregorianCalendar;
  54 import java.util.HashMap;
  55 import java.util.List;
  56 import java.util.Locale;
  57 import java.util.Objects;
  58 import java.util.Set;
  59 import java.util.concurrent.atomic.AtomicInteger;
  60 import java.util.regex.MatchResult;
  61
  62 enum ItemType {generalData, transactionRow}
  63
  64 enum FocusedElement {Account, Comment, Amount, Description, TransactionComment}
  65
  66
  67 public class NewTransactionModel extends ViewModel {
  68     private static final int MIN_ITEMS = 3;
  69     private final MutableLiveData<Boolean> showCurrency = new MutableLiveData<>(false);
  70     private final MutableLiveData<Boolean> isSubmittable = new InertMutableLiveData<>(false);
  71     private final MutableLiveData<Boolean> showComments = new MutableLiveData<>(true);
  72     private final MutableLiveData<List<Item>> items = new MutableLiveData<>();
  73     private final MutableLiveData<Boolean> simulateSave = new InertMutableLiveData<>(false);
  74     private final AtomicInteger busyCounter = new AtomicInteger(0);
  75     private final MutableLiveData<Boolean> busyFlag = new InertMutableLiveData<>(false);
  76     private final Observer<MobileLedgerProfile> profileObserver = profile -> {
  77         showCurrency.postValue(profile.getShowCommodityByDefault());
  78         showComments.postValue(profile.getShowCommentsByDefault());
  79     };
  80     private final MutableLiveData<FocusInfo> focusInfo = new MutableLiveData<>();
  81     private boolean observingDataProfile;
  82     public NewTransactionModel() {
  83         reset();
  84     }
  85     public LiveData<Boolean> getShowCurrency() {
  86         return showCurrency;
  87     }
  88     public LiveData<List<Item>> getItems() {
  89         return items;
  90     }
  91     private void setItems(@NonNull List<Item> newList) {
  92         checkTransactionSubmittable(newList);
  93         setItemsWithoutSubmittableChecks(newList);
  94     }
  95     private void setItemsWithoutSubmittableChecks(@NonNull List<Item> list) {
  96         Logger.debug("new-trans", "model: Setting new item list");
  97         final int cnt = list.size();
  98         for (int i = 1; i < cnt - 1; i++) {
  99             final TransactionAccount item = list.get(i)
 100                                                 .toTransactionAccount();
 101             if (item.isLast) {
 102                 TransactionAccount replacement = new TransactionAccount(item);
 103                 replacement.isLast = false;
 104                 list.set(i, replacement);
 105             }
 106         }
 107         final TransactionAccount last = list.get(cnt - 1)
 108                                             .toTransactionAccount();
 109         if (!last.isLast) {
 110             TransactionAccount replacement = new TransactionAccount(last);
 111             replacement.isLast = true;
 112             list.set(cnt - 1, replacement);
 113         }
 114
 115         items.setValue(list);
 116     }
 117     private List<Item> copyList() {
 118         return copyList(null);
 119     }
 120     private List<Item> copyList(@Nullable List<Item> source) {
 121         List<Item> copy = new ArrayList<>();
 122         List<Item> oldList = (source == null) ? items.getValue() : source;
 123
 124         if (oldList != null)
 125             for (Item item : oldList) {
 126                 copy.add(Item.from(item));
 127             }
 128
 129         return copy;
 130     }
 131     private List<Item> shallowCopyListWithoutItem(int position) {
 132         List<Item> copy = new ArrayList<>();
 133         List<Item> oldList = items.getValue();
 134
 135         if (oldList != null) {
 136             int i = 0;
 137             for (Item item : oldList) {
 138                 if (i++ == position)
 139                     continue;
 140                 copy.add(item);
 141             }
 142         }
 143
 144         return copy;
 145     }
 146     private List<Item> shallowCopyList() {
 147         return new ArrayList<>(items.getValue());
 148     }
 149     LiveData<Boolean> getShowComments() {
 150         return showComments;
 151     }
 152     void observeDataProfile(LifecycleOwner activity) {
 153         if (!observingDataProfile)
 154             Data.observeProfile(activity, profileObserver);
 155         observingDataProfile = true;
 156     }
 157     boolean getSimulateSaveFlag() {
 158         Boolean value = simulateSave.getValue();
 159         if (value == null)
 160             return false;
 161         return value;
 162     }
 163     LiveData<Boolean> getSimulateSave() {
 164         return simulateSave;
 165     }
 166     void toggleSimulateSave() {
 167         simulateSave.setValue(!getSimulateSaveFlag());
 168     }
 169     LiveData<Boolean> isSubmittable() {
 170         return this.isSubmittable;
 171     }
 172     void reset() {
 173         Logger.debug("new-trans", "Resetting model");
 174         List<Item> list = new ArrayList<>();
 175         list.add(new TransactionHead(""));
 176         list.add(new TransactionAccount(""));
 177         list.add(new TransactionAccount(""));
 178         noteFocusChanged(0, FocusedElement.Description);
 179         isSubmittable.setValue(false);
 180         setItemsWithoutSubmittableChecks(list);
 181     }
 182     boolean accountsInInitialState() {
 183         final List<Item> list = items.getValue();
 184
 185         if (list == null)
 186             return true;
 187
 188         for (Item item : list) {
 189             if (!(item instanceof TransactionAccount))
 190                 continue;
 191
 192             TransactionAccount accRow = (TransactionAccount) item;
 193             if (!accRow.isEmpty())
 194                 return false;
 195         }
 196
 197         return true;
 198     }
 199     void applyTemplate(MatchedTemplate matchedTemplate, String text) {
 200         SimpleDate transactionDate = null;
 201         final MatchResult matchResult = matchedTemplate.matchResult;
 202         final TemplateHeader templateHead = matchedTemplate.templateHead;
 203         {
 204             int day = extractIntFromMatches(matchResult, templateHead.getDateDayMatchGroup(),
 205                     templateHead.getDateDay());
 206             int month = extractIntFromMatches(matchResult, templateHead.getDateMonthMatchGroup(),
 207                     templateHead.getDateMonth());
 208             int year = extractIntFromMatches(matchResult, templateHead.getDateYearMatchGroup(),
 209                     templateHead.getDateYear());
 210
 211             if (year > 0 || month > 0 || day > 0) {
 212                 SimpleDate today = SimpleDate.today();
 213                 if (year <= 0)
 214                     year = today.year;
 215                 if (month <= 0)
 216                     month = today.month;
 217                 if (day <= 0)
 218                     day = today.day;
 219
 220                 transactionDate = new SimpleDate(year, month, day);
 221
 222                 Logger.debug("pattern", "setting transaction date to " + transactionDate);
 223             }
 224         }
 225
 226         List<Item> present = copyList();
 227
 228         TransactionHead head = new TransactionHead(present.get(0)
 229                                                           .toTransactionHead());
 230         if (transactionDate != null)
 231             head.setDate(transactionDate);
 232
 233         final String transactionDescription = extractStringFromMatches(matchResult,
 234                 templateHead.getTransactionDescriptionMatchGroup(),
 235                 templateHead.getTransactionDescription());
 236         if (Misc.emptyIsNull(transactionDescription) != null)
 237             head.setDescription(transactionDescription);
 238
 239         final String transactionComment = extractStringFromMatches(matchResult,
 240                 templateHead.getTransactionCommentMatchGroup(),
 241                 templateHead.getTransactionComment());
 242         if (Misc.emptyIsNull(transactionComment) != null)
 243             head.setComment(transactionComment);
 244
 245         List<Item> newItems = new ArrayList<>();
 246
 247         newItems.add(head);
 248
 249         for (int i = 1; i < present.size(); i++) {
 250             final TransactionAccount row = present.get(i)
 251                                                   .toTransactionAccount();
 252             if (!row.isEmpty())
 253                 newItems.add(new TransactionAccount(row));
 254         }
 255
 256         DB.get()
 257           .getTemplateDAO()
 258           .getTemplateWithAccountsAsync(templateHead.getId(), entry -> {
 259               int rowIndex = 0;
 260               final boolean accountsInInitialState = accountsInInitialState();
 261               for (TemplateAccount acc : entry.accounts) {
 262                   rowIndex++;
 263
 264                   String accountName =
 265                           extractStringFromMatches(matchResult, acc.getAccountNameMatchGroup(),
 266                                   acc.getAccountName());
 267                   String accountComment =
 268                           extractStringFromMatches(matchResult, acc.getAccountCommentMatchGroup(),
 269                                   acc.getAccountComment());
 270                   Float amount = extractFloatFromMatches(matchResult, acc.getAmountMatchGroup(),
 271                           acc.getAmount());
 272                   if (amount != null && acc.getNegateAmount() != null && acc.getNegateAmount())
 273                       amount = -amount;
 274
 275                   // TODO currency
 276                   TransactionAccount accRow = new TransactionAccount(accountName);
 277                   accRow.setComment(accountComment);
 278                   if (amount != null)
 279                       accRow.setAmount(amount);
 280
 281                   newItems.add(accRow);
 282               }
 283
 284               new Handler(Looper.getMainLooper()).post(() -> setItems(newItems));
 285           });
 286     }
 287     private int extractIntFromMatches(MatchResult m, Integer group, Integer literal) {
 288         if (literal != null)
 289             return literal;
 290
 291         if (group != null) {
 292             int grp = group;
 293             if (grp > 0 & grp <= m.groupCount())
 294                 try {
 295                     return Integer.parseInt(m.group(grp));
 296                 }
 297                 catch (NumberFormatException e) {
 298                     Logger.debug("new-trans", "Error extracting matched number", e);
 299                 }
 300         }
 301
 302         return 0;
 303     }
 304     private String extractStringFromMatches(MatchResult m, Integer group, String literal) {
 305         if (literal != null)
 306             return literal;
 307
 308         if (group != null) {
 309             int grp = group;
 310             if (grp > 0 & grp <= m.groupCount())
 311                 return m.group(grp);
 312         }
 313
 314         return null;
 315     }
 316     private Float extractFloatFromMatches(MatchResult m, Integer group, Float literal) {
 317         if (literal != null)
 318             return literal;
 319
 320         if (group != null) {
 321             int grp = group;
 322             if (grp > 0 & grp <= m.groupCount())
 323                 try {
 324                     return Float.valueOf(m.group(grp));
 325                 }
 326                 catch (NumberFormatException e) {
 327                     Logger.debug("new-trans", "Error extracting matched number", e);
 328                 }
 329         }
 330
 331         return null;
 332     }
 333     void removeItem(int pos) {
 334         List<Item> newList = shallowCopyListWithoutItem(pos);
 335         setItems(newList);
 336     }
 337     void noteFocusChanged(int position, FocusedElement element) {
 338         FocusInfo present = focusInfo.getValue();
 339         if (present == null || present.position != position || present.element != element)
 340             focusInfo.setValue(new FocusInfo(position, element));
 341     }
 342     public LiveData<FocusInfo> getFocusInfo() {
 343         return focusInfo;
 344     }
 345     void moveItem(int fromIndex, int toIndex) {
 346         List<Item> newList = shallowCopyList();
 347         Item item = newList.remove(fromIndex);
 348         newList.add(toIndex, item);
 349         items.setValue(newList); // same count, same submittable state
 350     }
 351     void moveItemLast(List<Item> list, int index) {
 352         /*   0
 353              1   <-- index
 354              2
 355              3   <-- desired position
 356                  (no bottom filler)
 357          */
 358         int itemCount = list.size();
 359
 360         if (index < itemCount - 1)
 361             list.add(list.remove(index));
 362     }
 363     void toggleCurrencyVisible() {
 364         final boolean newValue = !Objects.requireNonNull(showCurrency.getValue());
 365
 366         // remove currency from all items, or reset currency to the default
 367         // no need to clone the list, because the removal of the currency won't lead to
 368         // visual changes -- the currency fields will be hidden or reset to default anyway
 369         // still, there may be changes in the submittable state
 370         final List<Item> list = Objects.requireNonNull(this.items.getValue());
 371         for (int i = 1; i < list.size(); i++) {
 372             ((TransactionAccount) list.get(i)).setCurrency(newValue ? Data.getProfile()
 373                                                                           .getDefaultCommodity()
 374                                                                     : null);
 375         }
 376         checkTransactionSubmittable(null);
 377         showCurrency.setValue(newValue);
 378     }
 379     void stopObservingBusyFlag(Observer<Boolean> observer) {
 380         busyFlag.removeObserver(observer);
 381     }
 382     void incrementBusyCounter() {
 383         int newValue = busyCounter.incrementAndGet();
 384         if (newValue == 1)
 385             busyFlag.postValue(true);
 386     }
 387     void decrementBusyCounter() {
 388         int newValue = busyCounter.decrementAndGet();
 389         if (newValue == 0)
 390             busyFlag.postValue(false);
 391     }
 392     public LiveData<Boolean> getBusyFlag() {
 393         return busyFlag;
 394     }
 395     public void toggleShowComments() {
 396         showComments.setValue(!Objects.requireNonNull(showComments.getValue()));
 397     }
 398     public LedgerTransaction constructLedgerTransaction() {
 399         List<Item> list = Objects.requireNonNull(items.getValue());
 400         TransactionHead head = list.get(0)
 401                                    .toTransactionHead();
 402         SimpleDate date = head.getDate();
 403         LedgerTransaction tr = head.asLedgerTransaction();
 404
 405         tr.setComment(head.getComment());
 406         LedgerTransactionAccount emptyAmountAccount = null;
 407         float emptyAmountAccountBalance = 0;
 408         for (int i = 1; i < list.size(); i++) {
 409             TransactionAccount item = list.get(i)
 410                                           .toTransactionAccount();
 411             LedgerTransactionAccount acc = new LedgerTransactionAccount(item.getAccountName()
 412                                                                             .trim(),
 413                     item.getCurrency());
 414             if (acc.getAccountName()
 415                    .isEmpty())
 416                 continue;
 417
 418             acc.setComment(item.getComment());
 419
 420             if (item.isAmountSet()) {
 421                 acc.setAmount(item.getAmount());
 422                 emptyAmountAccountBalance += item.getAmount();
 423             }
 424             else {
 425                 emptyAmountAccount = acc;
 426             }
 427
 428             tr.addAccount(acc);
 429         }
 430
 431         if (emptyAmountAccount != null)
 432             emptyAmountAccount.setAmount(-emptyAmountAccountBalance);
 433
 434         return tr;
 435     }
 436     void loadTransactionIntoModel(String profileUUID, int transactionId) {
 437         List<Item> newList = new ArrayList<>();
 438         LedgerTransaction tr;
 439         MobileLedgerProfile profile = Data.getProfile(profileUUID);
 440         if (profile == null)
 441             throw new RuntimeException(String.format(
 442                     "Unable to find profile %s, which is supposed to contain transaction %d",
 443                     profileUUID, transactionId));
 444
 445         tr = profile.loadTransaction(transactionId);
 446         TransactionHead head = new TransactionHead(tr.getDescription());
 447         head.setComment(tr.getComment());
 448
 449         newList.add(head);
 450
 451         List<LedgerTransactionAccount> accounts = tr.getAccounts();
 452
 453         TransactionAccount firstNegative = null;
 454         TransactionAccount firstPositive = null;
 455         int singleNegativeIndex = -1;
 456         int singlePositiveIndex = -1;
 457         int negativeCount = 0;
 458         for (int i = 0; i < accounts.size(); i++) {
 459             LedgerTransactionAccount acc = accounts.get(i);
 460             TransactionAccount item =
 461                     new TransactionAccount(acc.getAccountName(), acc.getCurrency());
 462             newList.add(item);
 463
 464             item.setAccountName(acc.getAccountName());
 465             item.setComment(acc.getComment());
 466             if (acc.isAmountSet()) {
 467                 item.setAmount(acc.getAmount());
 468                 if (acc.getAmount() < 0) {
 469                     if (firstNegative == null) {
 470                         firstNegative = item;
 471                         singleNegativeIndex = i + 1;
 472                     }
 473                     else
 474                         singleNegativeIndex = -1;
 475                 }
 476                 else {
 477                     if (firstPositive == null) {
 478                         firstPositive = item;
 479                         singlePositiveIndex = i + 1;
 480                     }
 481                     else
 482                         singlePositiveIndex = -1;
 483                 }
 484             }
 485             else
 486                 item.resetAmount();
 487         }
 488         if (BuildConfig.DEBUG)
 489             dumpItemList("Loaded previous transaction", newList);
 490
 491         if (singleNegativeIndex != -1) {
 492             firstNegative.resetAmount();
 493             moveItemLast(newList, singleNegativeIndex);
 494         }
 495         else if (singlePositiveIndex != -1) {
 496             firstPositive.resetAmount();
 497             moveItemLast(newList, singlePositiveIndex);
 498         }
 499
 500         setItems(newList);
 501
 502         noteFocusChanged(1, FocusedElement.Amount);
 503     }
 504     /**
 505      * A transaction is submittable if:
 506      * 0) has description
 507      * 1) has at least two account names
 508      * 2) each row with amount has account name
 509      * 3) for each commodity:
 510      * 3a) amounts must balance to 0, or
 511      * 3b) there must be exactly one empty amount (with account)
 512      * 4) empty accounts with empty amounts are ignored
 513      * Side effects:
 514      * 5) a row with an empty account name or empty amount is guaranteed to exist for each
 515      * commodity
 516      * 6) at least two rows need to be present in the ledger
 517      *
 518      * @param list - the item list to check. Can be the displayed list or a list that will be
 519      *             displayed soon
 520      */
 521     @SuppressLint("DefaultLocale")
 522     void checkTransactionSubmittable(@Nullable List<Item> list) {
 523         boolean workingWithLiveList = false;
 524         boolean liveListCopied = false;
 525         if (list == null) {
 526             list = Objects.requireNonNull(items.getValue());
 527             workingWithLiveList = true;
 528         }
 529
 530         if (BuildConfig.DEBUG)
 531             dumpItemList("Before submittable checks", list);
 532
 533         int accounts = 0;
 534         final BalanceForCurrency balance = new BalanceForCurrency();
 535         final String descriptionText = list.get(0)
 536                                            .toTransactionHead()
 537                                            .getDescription();
 538         boolean submittable = true;
 539         boolean listChanged = false;
 540         final ItemsForCurrency itemsForCurrency = new ItemsForCurrency();
 541         final ItemsForCurrency itemsWithEmptyAmountForCurrency = new ItemsForCurrency();
 542         final ItemsForCurrency itemsWithAccountAndEmptyAmountForCurrency = new ItemsForCurrency();
 543         final ItemsForCurrency itemsWithEmptyAccountForCurrency = new ItemsForCurrency();
 544         final ItemsForCurrency itemsWithAmountForCurrency = new ItemsForCurrency();
 545         final ItemsForCurrency itemsWithAccountForCurrency = new ItemsForCurrency();
 546         final ItemsForCurrency emptyRowsForCurrency = new ItemsForCurrency();
 547         final List<Item> emptyRows = new ArrayList<>();
 548
 549         try {
 550             if ((descriptionText == null) || descriptionText.trim()
 551                                                             .isEmpty())
 552             {
 553                 Logger.debug("submittable", "Transaction not submittable: missing description");
 554                 submittable = false;
 555             }
 556
 557             for (int i = 1; i < list.size(); i++) {
 558                 TransactionAccount item = list.get(i)
 559                                               .toTransactionAccount();
 560
 561                 String accName = item.getAccountName()
 562                                      .trim();
 563                 String currName = item.getCurrency();
 564
 565                 itemsForCurrency.add(currName, item);
 566
 567                 if (accName.isEmpty()) {
 568                     itemsWithEmptyAccountForCurrency.add(currName, item);
 569
 570                     if (item.isAmountSet()) {
 571                         // 2) each amount has account name
 572                         Logger.debug("submittable", String.format(
 573                                 "Transaction not submittable: row %d has no account name, but" +
 574                                 " has" + " amount %1.2f", i + 1, item.getAmount()));
 575                         submittable = false;
 576                     }
 577                     else {
 578                         emptyRowsForCurrency.add(currName, item);
 579                     }
 580                 }
 581                 else {
 582                     accounts++;
 583                     itemsWithAccountForCurrency.add(currName, item);
 584                 }
 585
 586                 if (!item.isAmountValid()) {
 587                     Logger.debug("submittable",
 588                             String.format("Not submittable: row %d has an invalid amount", i + 1));
 589                     submittable = false;
 590                 }
 591                 else if (item.isAmountSet()) {
 592                     itemsWithAmountForCurrency.add(currName, item);
 593                     balance.add(currName, item.getAmount());
 594                 }
 595                 else {
 596                     itemsWithEmptyAmountForCurrency.add(currName, item);
 597
 598                     if (!accName.isEmpty())
 599                         itemsWithAccountAndEmptyAmountForCurrency.add(currName, item);
 600                 }
 601             }
 602
 603             // 1) has at least two account names
 604             if (accounts < 2) {
 605                 if (accounts == 0)
 606                     Logger.debug("submittable", "Transaction not submittable: no account names");
 607                 else if (accounts == 1)
 608                     Logger.debug("submittable",
 609                             "Transaction not submittable: only one account name");
 610                 else
 611                     Logger.debug("submittable",
 612                             String.format("Transaction not submittable: only %d account names",
 613                                     accounts));
 614                 submittable = false;
 615             }
 616
 617             // 3) for each commodity:
 618             // 3a) amount must balance to 0, or
 619             // 3b) there must be exactly one empty amount (with account)
 620             for (String balCurrency : itemsForCurrency.currencies()) {
 621                 float currencyBalance = balance.get(balCurrency);
 622                 if (Misc.isZero(currencyBalance)) {
 623                     // remove hints from all amount inputs in that currency
 624                     for (int i = 1; i < list.size(); i++) {
 625                         TransactionAccount acc = list.get(i)
 626                                                      .toTransactionAccount();
 627                         if (Misc.equalStrings(acc.getCurrency(), balCurrency)) {
 628                             if (BuildConfig.DEBUG)
 629                                 Logger.debug("submittable",
 630                                         String.format("Resetting hint of '%s' [%s]",
 631                                                 Misc.nullIsEmpty(acc.getAccountName()),
 632                                                 balCurrency));
 633                             // skip if the amount is set, in which case the hint is not
 634                             // important/visible
 635                             if (!acc.isAmountSet() && acc.amountHintIsSet &&
 636                                 !TextUtils.isEmpty(acc.getAmountHint()))
 637                             {
 638                                 if (workingWithLiveList && !liveListCopied) {
 639                                     list = copyList(list);
 640                                     liveListCopied = true;
 641                                 }
 642                                 final TransactionAccount newAcc = new TransactionAccount(acc);
 643                                 newAcc.setAmountHint(null);
 644                                 if (!liveListCopied) {
 645                                     list = copyList(list);
 646                                     liveListCopied = true;
 647                                 }
 648                                 list.set(i, newAcc);
 649                                 listChanged = true;
 650                             }
 651                         }
 652                     }
 653                 }
 654                 else {
 655                     List<Item> tmpList =
 656                             itemsWithAccountAndEmptyAmountForCurrency.getList(balCurrency);
 657                     int balanceReceiversCount = tmpList.size();
 658                     if (balanceReceiversCount != 1) {
 659                         if (BuildConfig.DEBUG) {
 660                             if (balanceReceiversCount == 0)
 661                                 Logger.debug("submittable", String.format(
 662                                         "Transaction not submittable [%s]: non-zero balance " +
 663                                         "with no empty amounts with accounts", balCurrency));
 664                             else
 665                                 Logger.debug("submittable", String.format(
 666                                         "Transaction not submittable [%s]: non-zero balance " +
 667                                         "with multiple empty amounts with accounts", balCurrency));
 668                         }
 669                         submittable = false;
 670                     }
 671
 672                     List<Item> emptyAmountList =
 673                             itemsWithEmptyAmountForCurrency.getList(balCurrency);
 674
 675                     // suggest off-balance amount to a row and remove hints on other rows
 676                     Item receiver = null;
 677                     if (!tmpList.isEmpty())
 678                         receiver = tmpList.get(0);
 679                     else if (!emptyAmountList.isEmpty())
 680                         receiver = emptyAmountList.get(0);
 681
 682                     for (int i = 0; i < list.size(); i++) {
 683                         Item item = list.get(i);
 684                         if (!(item instanceof TransactionAccount))
 685                             continue;
 686
 687                         TransactionAccount acc = item.toTransactionAccount();
 688                         if (!Misc.equalStrings(acc.getCurrency(), balCurrency))
 689                             continue;
 690
 691                         if (item == receiver) {
 692                             final String hint = String.format("%1.2f", -currencyBalance);
 693                             if (!acc.isAmountHintSet() ||
 694                                 !TextUtils.equals(acc.getAmountHint(), hint))
 695                             {
 696                                 Logger.debug("submittable",
 697                                         String.format("Setting amount hint of {%s} to %s [%s]",
 698                                                 acc.toString(), hint, balCurrency));
 699                                 if (workingWithLiveList & !liveListCopied) {
 700                                     list = copyList(list);
 701                                     liveListCopied = true;
 702                                 }
 703                                 final TransactionAccount newAcc = new TransactionAccount(acc);
 704                                 newAcc.setAmountHint(hint);
 705                                 list.set(i, newAcc);
 706                                 listChanged = true;
 707                             }
 708                         }
 709                         else {
 710                             if (BuildConfig.DEBUG)
 711                                 Logger.debug("submittable",
 712                                         String.format("Resetting hint of '%s' [%s]",
 713                                                 Misc.nullIsEmpty(acc.getAccountName()),
 714                                                 balCurrency));
 715                             if (acc.amountHintIsSet && !TextUtils.isEmpty(acc.getAmountHint())) {
 716                                 if (workingWithLiveList && !liveListCopied) {
 717                                     list = copyList(list);
 718                                     liveListCopied = true;
 719                                 }
 720                                 final TransactionAccount newAcc = new TransactionAccount(acc);
 721                                 newAcc.setAmountHint(null);
 722                                 list.set(i, newAcc);
 723                                 listChanged = true;
 724                             }
 725                         }
 726                     }
 727                 }
 728             }
 729
 730             // 5) a row with an empty account name or empty amount is guaranteed to exist for
 731             // each commodity
 732             for (String balCurrency : balance.currencies()) {
 733                 int currEmptyRows = itemsWithEmptyAccountForCurrency.size(balCurrency);
 734                 int currRows = itemsForCurrency.size(balCurrency);
 735                 int currAccounts = itemsWithAccountForCurrency.size(balCurrency);
 736                 int currAmounts = itemsWithAmountForCurrency.size(balCurrency);
 737                 if ((currEmptyRows == 0) &&
 738                     ((currRows == currAccounts) || (currRows == currAmounts)))
 739                 {
 740                     // perhaps there already is an unused empty row for another currency that
 741                     // is not used?
 742 //                        boolean foundIt = false;
 743 //                        for (Item item : emptyRows) {
 744 //                            Currency itemCurrency = item.getCurrency();
 745 //                            String itemCurrencyName =
 746 //                                    (itemCurrency == null) ? "" : itemCurrency.getName();
 747 //                            if (Misc.isZero(balance.get(itemCurrencyName))) {
 748 //                                item.setCurrency(Currency.loadByName(balCurrency));
 749 //                                item.setAmountHint(
 750 //                                        String.format("%1.2f", -balance.get(balCurrency)));
 751 //                                foundIt = true;
 752 //                                break;
 753 //                            }
 754 //                        }
 755 //
 756 //                        if (!foundIt)
 757                     if (workingWithLiveList && !liveListCopied) {
 758                         list = copyList(list);
 759                         liveListCopied = true;
 760                     }
 761                     final TransactionAccount newAcc = new TransactionAccount("", balCurrency);
 762                     final float bal = balance.get(balCurrency);
 763                     if (!Misc.isZero(bal) && currAmounts == currRows)
 764                         newAcc.setAmountHint(String.format("%4.2f", -bal));
 765                     Logger.debug("submittable",
 766                             String.format("Adding new item with %s for currency %s",
 767                                     newAcc.getAmountHint(), balCurrency));
 768                     list.add(newAcc);
 769                     listChanged = true;
 770                 }
 771             }
 772
 773             // drop extra empty rows, not needed
 774             for (String currName : emptyRowsForCurrency.currencies()) {
 775                 List<Item> emptyItems = emptyRowsForCurrency.getList(currName);
 776                 while ((list.size() > MIN_ITEMS) && (emptyItems.size() > 1)) {
 777                     if (workingWithLiveList && !liveListCopied) {
 778                         list = copyList(list);
 779                         liveListCopied = true;
 780                     }
 781                     // the list is a copy, so the empty item is no longer present
 782                     Item itemToRemove = emptyItems.remove(1);
 783                     removeItemById(list, itemToRemove.id);
 784                     listChanged = true;
 785                 }
 786
 787                 // unused currency, remove last item (which is also an empty one)
 788                 if ((list.size() > MIN_ITEMS) && (emptyItems.size() == 1)) {
 789                     List<Item> currItems = itemsForCurrency.getList(currName);
 790
 791                     if (currItems.size() == 1) {
 792                         if (workingWithLiveList && !liveListCopied) {
 793                             list = copyList(list);
 794                             liveListCopied = true;
 795                         }
 796                         // the list is a copy, so the empty item is no longer present
 797                         removeItemById(list, emptyItems.get(0).id);
 798                         listChanged = true;
 799                     }
 800                 }
 801             }
 802
 803             // 6) at least two rows need to be present in the ledger
 804             //    (the list also contains header and trailer)
 805             while (list.size() < MIN_ITEMS) {
 806                 if (workingWithLiveList && !liveListCopied) {
 807                     list = copyList(list);
 808                     liveListCopied = true;
 809                 }
 810                 list.add(new TransactionAccount(""));
 811                 listChanged = true;
 812             }
 813
 814
 815             Logger.debug("submittable", submittable ? "YES" : "NO");
 816             isSubmittable.setValue(submittable);
 817
 818             if (BuildConfig.DEBUG)
 819                 dumpItemList("After submittable checks", list);
 820         }
 821         catch (NumberFormatException e) {
 822             Logger.debug("submittable", "NO (because of NumberFormatException)");
 823             isSubmittable.setValue(false);
 824         }
 825         catch (Exception e) {
 826             e.printStackTrace();
 827             Logger.debug("submittable", "NO (because of an Exception)");
 828             isSubmittable.setValue(false);
 829         }
 830
 831         if (listChanged && workingWithLiveList) {
 832             setItemsWithoutSubmittableChecks(list);
 833         }
 834     }
 835     private void removeItemById(@NotNull List<Item> list, int id) {
 836         if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
 837             list.removeIf(item -> item.id == id);
 838         }
 839         else {
 840             for (Item item : list) {
 841                 if (item.id == id) {
 842                     list.remove(item);
 843                     break;
 844                 }
 845             }
 846         }
 847     }
 848     @SuppressLint("DefaultLocale")
 849     private void dumpItemList(@NotNull String msg, @NotNull List<Item> list) {
 850         Logger.debug("submittable", "== Dump of all items " + msg);
 851         for (int i = 1; i < list.size(); i++) {
 852             TransactionAccount item = list.get(i)
 853                                           .toTransactionAccount();
 854             Logger.debug("submittable", String.format("%d:%s", i, item.toString()));
 855         }
 856     }
 857     public void setItemCurrency(int position, String newCurrency) {
 858         TransactionAccount item = Objects.requireNonNull(items.getValue())
 859                                          .get(position)
 860                                          .toTransactionAccount();
 861         final String oldCurrency = item.getCurrency();
 862
 863         if (Misc.equalStrings(oldCurrency, newCurrency))
 864             return;
 865
 866         List<Item> newList = copyList();
 867         newList.get(position)
 868                .toTransactionAccount()
 869                .setCurrency(newCurrency);
 870
 871         setItems(newList);
 872     }
 873     public boolean accountListIsEmpty() {
 874         List<Item> items = Objects.requireNonNull(this.items.getValue());
 875
 876         for (Item item : items) {
 877             if (!(item instanceof TransactionAccount))
 878                 continue;
 879
 880             if (!((TransactionAccount) item).isEmpty())
 881                 return false;
 882         }
 883
 884         return true;
 885     }
 886
 887     public static class FocusInfo {
 888         int position;
 889         FocusedElement element;
 890         public FocusInfo(int position, FocusedElement element) {
 891             this.position = position;
 892             this.element = element;
 893         }
 894     }
 895
 896     static abstract class Item {
 897         private static int idDispenser = 0;
 898         protected int id;
 899         private Item() {
 900             synchronized (Item.class) {
 901                 id = ++idDispenser;
 902             }
 903         }
 904         public static Item from(Item origin) {
 905             if (origin instanceof TransactionHead)
 906                 return new TransactionHead((TransactionHead) origin);
 907             if (origin instanceof TransactionAccount)
 908                 return new TransactionAccount((TransactionAccount) origin);
 909             throw new RuntimeException("Don't know how to handle " + origin);
 910         }
 911         public int getId() {
 912             return id;
 913         }
 914         public abstract ItemType getType();
 915         public TransactionHead toTransactionHead() {
 916             if (this instanceof TransactionHead)
 917                 return (TransactionHead) this;
 918
 919             throw new IllegalStateException("Wrong item type " + this);
 920         }
 921         public TransactionAccount toTransactionAccount() {
 922             if (this instanceof TransactionAccount)
 923                 return (TransactionAccount) this;
 924
 925             throw new IllegalStateException("Wrong item type " + this);
 926         }
 927         public boolean equalContents(@Nullable Object item) {
 928             if (item == null)
 929                 return false;
 930
 931             if (!getClass().equals(item.getClass()))
 932                 return false;
 933
 934             // shortcut - comparing same instance
 935             if (item == this)
 936                 return true;
 937
 938             if (this instanceof TransactionHead)
 939                 return ((TransactionHead) item).equalContents((TransactionHead) this);
 940             if (this instanceof TransactionAccount)
 941                 return ((TransactionAccount) item).equalContents((TransactionAccount) this);
 942
 943             throw new RuntimeException("Don't know how to handle " + this);
 944         }
 945     }
 946
 947
 948 //==========================================================================================
 949
 950     public static class TransactionHead extends Item {
 951         private SimpleDate date;
 952         private String description;
 953         private String comment;
 954         TransactionHead(String description) {
 955             super();
 956             this.description = description;
 957         }
 958         public TransactionHead(TransactionHead origin) {
 959             id = origin.id;
 960             date = origin.date;
 961             description = origin.description;
 962             comment = origin.comment;
 963         }
 964         public SimpleDate getDate() {
 965             return date;
 966         }
 967         public void setDate(SimpleDate date) {
 968             this.date = date;
 969         }
 970         public void setDate(String text) throws ParseException {
 971             if (Misc.emptyIsNull(text) == null) {
 972                 date = null;
 973                 return;
 974             }
 975
 976             date = Globals.parseLedgerDate(text);
 977         }
 978         /**
 979          * getFormattedDate()
 980          *
 981          * @return nicely formatted, shortest available date representation
 982          */
 983         String getFormattedDate() {
 984             if (date == null)
 985                 return null;
 986
 987             Calendar today = GregorianCalendar.getInstance();
 988
 989             if (today.get(Calendar.YEAR) != date.year) {
 990                 return String.format(Locale.US, "%d/%02d/%02d", date.year, date.month, date.day);
 991             }
 992
 993             if (today.get(Calendar.MONTH) + 1 != date.month) {
 994                 return String.format(Locale.US, "%d/%02d", date.month, date.day);
 995             }
 996
 997             return String.valueOf(date.day);
 998         }
 999         @NonNull
1000         @Override
1001         public String toString() {
1002             @SuppressLint("DefaultLocale") StringBuilder b = new StringBuilder(
1003                     String.format("id:%d/%s", id, Integer.toHexString(hashCode())));
1004
1005             if (TextUtils.isEmpty(description))
1006                 b.append(" «no description»");
1007             else
1008                 b.append(String.format(" descr'%s'", description));
1009
1010             if (date != null)
1011                 b.append(String.format("@%s", date.toString()));
1012
1013             if (!TextUtils.isEmpty(comment))
1014                 b.append(String.format(" /%s/", comment));
1015
1016             return b.toString();
1017         }
1018         public String getDescription() {
1019             return description;
1020         }
1021         public void setDescription(String description) {
1022             this.description = description;
1023         }
1024         public String getComment() {
1025             return comment;
1026         }
1027         public void setComment(String comment) {
1028             this.comment = comment;
1029         }
1030         @Override
1031         public ItemType getType() {
1032             return ItemType.generalData;
1033         }
1034         public LedgerTransaction asLedgerTransaction() {
1035             return new LedgerTransaction(null, date, description, Data.getProfile());
1036         }
1037         public boolean equalContents(TransactionHead other) {
1038             if (other == null)
1039                 return false;
1040
1041             return Objects.equals(date, other.date) &&
1042                    TextUtils.equals(description, other.description) &&
1043                    TextUtils.equals(comment, other.comment);
1044         }
1045     }
1046
1047     public static class TransactionAccount extends Item {
1048         private String accountName;
1049         private String amountHint;
1050         private String comment;
1051         private String currency;
1052         private float amount;
1053         private boolean amountSet;
1054         private boolean amountValid = true;
1055         private FocusedElement focusedElement = FocusedElement.Account;
1056         private boolean amountHintIsSet = true;
1057         private boolean isLast = false;
1058         private int accountNameCursorPosition;
1059         public TransactionAccount(TransactionAccount origin) {
1060             id = origin.id;
1061             accountName = origin.accountName;
1062             amount = origin.amount;
1063             amountSet = origin.amountSet;
1064             amountHint = origin.amountHint;
1065             amountHintIsSet = origin.amountHintIsSet;
1066             comment = origin.comment;
1067             currency = origin.currency;
1068             amountValid = origin.amountValid;
1069             focusedElement = origin.focusedElement;
1070             isLast = origin.isLast;
1071             accountNameCursorPosition = origin.accountNameCursorPosition;
1072         }
1073         public TransactionAccount(LedgerTransactionAccount account) {
1074             super();
1075             currency = account.getCurrency();
1076             amount = account.getAmount();
1077         }
1078         public TransactionAccount(String accountName) {
1079             super();
1080             this.accountName = accountName;
1081         }
1082         public TransactionAccount(String accountName, String currency) {
1083             super();
1084             this.accountName = accountName;
1085             this.currency = currency;
1086         }
1087         public boolean isLast() {
1088             return isLast;
1089         }
1090         public boolean isAmountSet() {
1091             return amountSet;
1092         }
1093         public String getAccountName() {
1094             return accountName;
1095         }
1096         public void setAccountName(String accountName) {
1097             this.accountName = accountName;
1098         }
1099         public float getAmount() {
1100             if (!amountSet)
1101                 throw new IllegalStateException("Amount is not set");
1102             return amount;
1103         }
1104         public void setAmount(float amount) {
1105             this.amount = amount;
1106             amountSet = true;
1107         }
1108         public void resetAmount() {
1109             amountSet = false;
1110         }
1111         @Override
1112         public ItemType getType() {
1113             return ItemType.transactionRow;
1114         }
1115         public String getAmountHint() {
1116             return amountHint;
1117         }
1118         public void setAmountHint(String amountHint) {
1119             this.amountHint = amountHint;
1120             amountHintIsSet = !TextUtils.isEmpty(amountHint);
1121         }
1122         public String getComment() {
1123             return comment;
1124         }
1125         public void setComment(String comment) {
1126             this.comment = comment;
1127         }
1128         public String getCurrency() {
1129             return currency;
1130         }
1131         public void setCurrency(String currency) {
1132             this.currency = currency;
1133         }
1134         public boolean isAmountValid() {
1135             return amountValid;
1136         }
1137         public void setAmountValid(boolean amountValid) {
1138             this.amountValid = amountValid;
1139         }
1140         public FocusedElement getFocusedElement() {
1141             return focusedElement;
1142         }
1143         public void setFocusedElement(FocusedElement focusedElement) {
1144             this.focusedElement = focusedElement;
1145         }
1146         public boolean isAmountHintSet() {
1147             return amountHintIsSet;
1148         }
1149         public void setAmountHintIsSet(boolean amountHintIsSet) {
1150             this.amountHintIsSet = amountHintIsSet;
1151         }
1152         public boolean isEmpty() {
1153             return !amountSet && Misc.emptyIsNull(accountName) == null &&
1154                    Misc.emptyIsNull(comment) == null;
1155         }
1156         @SuppressLint("DefaultLocale")
1157         @Override
1158         public String toString() {
1159             StringBuilder b = new StringBuilder();
1160             b.append(String.format("id:%d/%s", id, Integer.toHexString(hashCode())));
1161             if (!TextUtils.isEmpty(accountName))
1162                 b.append(String.format(" acc'%s'", accountName));
1163
1164             if (amountSet)
1165                 b.append(String.format(" %4.2f", amount));
1166             else if (amountHintIsSet)
1167                 b.append(String.format(" (%s)", amountHint));
1168
1169             if (!TextUtils.isEmpty(currency))
1170                 b.append(" ")
1171                  .append(currency);
1172
1173             if (!TextUtils.isEmpty(comment))
1174                 b.append(String.format(" /%s/", comment));
1175
1176             if (isLast)
1177                 b.append(" last");
1178
1179             return b.toString();
1180         }
1181         public boolean equalContents(TransactionAccount other) {
1182             if (other == null)
1183                 return false;
1184
1185             boolean equal = TextUtils.equals(accountName, other.accountName);
1186             equal = equal && TextUtils.equals(comment, other.comment) &&
1187                     (amountSet ? other.amountSet && amount == other.amount : !other.amountSet);
1188
1189             // compare amount hint only if there is no amount
1190             if (!amountSet)
1191                 equal = equal && (amountHintIsSet ? other.amountHintIsSet &&
1192                                                     TextUtils.equals(amountHint, other.amountHint)
1193                                                   : !other.amountHintIsSet);
1194             equal = equal && TextUtils.equals(currency, other.currency) && isLast == other.isLast;
1195
1196             Logger.debug("new-trans",
1197                     String.format("Comparing {%s} and {%s}: %s", this.toString(), other.toString(),
1198                             equal));
1199             return equal;
1200         }
1201         public int getAccountNameCursorPosition() {
1202             return accountNameCursorPosition;
1203         }
1204         public void setAccountNameCursorPosition(int position) {
1205             this.accountNameCursorPosition = position;
1206         }
1207     }
1208
1209     private static class BalanceForCurrency {
1210         private final HashMap<String, Float> hashMap = new HashMap<>();
1211         float get(String currencyName) {
1212             Float f = hashMap.get(currencyName);
1213             if (f == null) {
1214                 f = 0f;
1215                 hashMap.put(currencyName, f);
1216             }
1217             return f;
1218         }
1219         void add(String currencyName, float amount) {
1220             hashMap.put(currencyName, get(currencyName) + amount);
1221         }
1222         Set<String> currencies() {
1223             return hashMap.keySet();
1224         }
1225         boolean containsCurrency(String currencyName) {
1226             return hashMap.containsKey(currencyName);
1227         }
1228     }
1229
1230     private static class ItemsForCurrency {
1231         private final HashMap<String, List<Item>> hashMap = new HashMap<>();
1232         @NonNull
1233         List<NewTransactionModel.Item> getList(@Nullable String currencyName) {
1234             List<NewTransactionModel.Item> list = hashMap.get(currencyName);
1235             if (list == null) {
1236                 list = new ArrayList<>();
1237                 hashMap.put(currencyName, list);
1238             }
1239             return list;
1240         }
1241         void add(@Nullable String currencyName, @NonNull NewTransactionModel.Item item) {
1242             getList(currencyName).add(item);
1243         }
1244         int size(@Nullable String currencyName) {
1245             return this.getList(currencyName)
1246                        .size();
1247         }
1248         Set<String> currencies() {
1249             return hashMap.keySet();
1250         }
1251     }
1252 }