app/src/main/java/net/ktnx/mobileledger/async/RetrieveTransactionsTask.java

   1 /*
   2  * Copyright © 2020 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.async;
  19
  20 import android.annotation.SuppressLint;
  21 import android.database.sqlite.SQLiteDatabase;
  22 import android.os.AsyncTask;
  23 import android.os.OperationCanceledException;
  24
  25 import androidx.annotation.NonNull;
  26
  27 import net.ktnx.mobileledger.App;
  28 import net.ktnx.mobileledger.err.HTTPException;
  29 import net.ktnx.mobileledger.json.v1_15.AccountListParser;
  30 import net.ktnx.mobileledger.json.v1_15.ParsedBalance;
  31 import net.ktnx.mobileledger.json.v1_15.ParsedLedgerAccount;
  32 import net.ktnx.mobileledger.json.v1_15.ParsedLedgerTransaction;
  33 import net.ktnx.mobileledger.json.v1_15.TransactionListParser;
  34 import net.ktnx.mobileledger.model.Data;
  35 import net.ktnx.mobileledger.model.LedgerAccount;
  36 import net.ktnx.mobileledger.model.LedgerTransaction;
  37 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  38 import net.ktnx.mobileledger.model.MobileLedgerProfile;
  39 import net.ktnx.mobileledger.ui.activity.MainActivity;
  40 import net.ktnx.mobileledger.utils.NetworkUtil;
  41
  42 import java.io.BufferedReader;
  43 import java.io.IOException;
  44 import java.io.InputStream;
  45 import java.io.InputStreamReader;
  46 import java.lang.ref.WeakReference;
  47 import java.net.HttpURLConnection;
  48 import java.net.MalformedURLException;
  49 import java.net.URLDecoder;
  50 import java.nio.charset.StandardCharsets;
  51 import java.text.ParseException;
  52 import java.util.ArrayList;
  53 import java.util.HashMap;
  54 import java.util.Locale;
  55 import java.util.Stack;
  56 import java.util.regex.Matcher;
  57 import java.util.regex.Pattern;
  58
  59 import static net.ktnx.mobileledger.utils.Logger.debug;
  60
  61
  62 public class RetrieveTransactionsTask
  63         extends AsyncTask<Void, RetrieveTransactionsTask.Progress, String> {
  64     private static final int MATCHING_TRANSACTIONS_LIMIT = 150;
  65     private static final Pattern reComment = Pattern.compile("^\\s*;");
  66     private static final Pattern reTransactionStart = Pattern.compile(
  67             "<tr class=\"title\" " + "id=\"transaction-(\\d+)" + "\"><td class=\"date" +
  68             "\"[^\"]*>([\\d.-]+)</td>");
  69     private static final Pattern reTransactionDescription =
  70             Pattern.compile("<tr class=\"posting\" title=\"(\\S+)\\s(.+)");
  71     private static final Pattern reTransactionDetails = Pattern.compile(
  72             "^\\s+" + "([!*]\\s+)?" + "(\\S[\\S\\s]+\\S)\\s\\s+" + "(?:([^\\d\\s+\\-]+)\\s*)?" +
  73             "([-+]?\\d[\\d,.]*)" + "(?:\\s*([^\\d\\s+\\-]+)\\s*$)?");
  74     private static final Pattern reEnd = Pattern.compile("\\bid=\"addmodal\"");
  75     private static final Pattern reDecimalPoint = Pattern.compile("\\.\\d\\d?$");
  76     private static final Pattern reDecimalComma = Pattern.compile(",\\d\\d?$");
  77     private WeakReference<MainActivity> contextRef;
  78     // %3A is '='
  79     private Pattern reAccountName = Pattern.compile("/register\\?q=inacct%3A([a-zA-Z0-9%]+)\"");
  80     private Pattern reAccountValue = Pattern.compile(
  81             "<span class=\"[^\"]*\\bamount\\b[^\"]*\">\\s*([-+]?[\\d.,]+)(?:\\s+(\\S+))?</span>");
  82     private MobileLedgerProfile profile;
  83     public RetrieveTransactionsTask(WeakReference<MainActivity> contextRef,
  84                                     @NonNull MobileLedgerProfile profile) {
  85         this.contextRef = contextRef;
  86         this.profile = profile;
  87     }
  88     private static void L(String msg) {
  89         //debug("transaction-parser", msg);
  90     }
  91     static LedgerTransactionAccount parseTransactionAccountLine(String line) {
  92         Matcher m = reTransactionDetails.matcher(line);
  93         if (m.find()) {
  94             String postingStatus = m.group(1);
  95             String acc_name = m.group(2);
  96             String currencyPre = m.group(3);
  97             String amount = m.group(4);
  98             String currencyPost = m.group(5);
  99
 100             String currency = null;
 101             if ((currencyPre != null) && (currencyPre.length() > 0)) {
 102                 if ((currencyPost != null) && (currencyPost.length() > 0))
 103                     return null;
 104                 currency = currencyPre;
 105             }
 106             else if ((currencyPost != null) && (currencyPost.length() > 0)) {
 107                 currency = currencyPost;
 108             }
 109
 110             amount = amount.replace(',', '.');
 111
 112             return new LedgerTransactionAccount(acc_name, Float.valueOf(amount), currency, null);
 113         }
 114         else {
 115             return null;
 116         }
 117     }
 118     @Override
 119     protected void onProgressUpdate(Progress... values) {
 120         super.onProgressUpdate(values);
 121         MainActivity context = getContext();
 122         if (context == null)
 123             return;
 124         context.onRetrieveProgress(values[0]);
 125     }
 126     @Override
 127     protected void onPreExecute() {
 128         super.onPreExecute();
 129         MainActivity context = getContext();
 130         if (context == null)
 131             return;
 132         context.onRetrieveStart();
 133     }
 134     @Override
 135     protected void onPostExecute(String error) {
 136         super.onPostExecute(error);
 137         MainActivity context = getContext();
 138         if (context == null)
 139             return;
 140         context.onRetrieveDone(error);
 141     }
 142     @Override
 143     protected void onCancelled() {
 144         super.onCancelled();
 145         MainActivity context = getContext();
 146         if (context == null)
 147             return;
 148         context.onRetrieveDone(null);
 149     }
 150     private String retrieveTransactionListLegacy()
 151             throws IOException, ParseException, HTTPException {
 152         Progress progress = new Progress();
 153         int maxTransactionId = Progress.INDETERMINATE;
 154         ArrayList<LedgerAccount> accountList = new ArrayList<>();
 155         HashMap<String, Void> accountNames = new HashMap<>();
 156         HashMap<String, LedgerAccount> syntheticAccounts = new HashMap<>();
 157         LedgerAccount lastAccount = null, prevAccount = null;
 158
 159         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "journal");
 160         http.setAllowUserInteraction(false);
 161         publishProgress(progress);
 162         if (http.getResponseCode() != 200)
 163             throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 164
 165         SQLiteDatabase db = App.getDatabase();
 166         try (InputStream resp = http.getInputStream()) {
 167             if (http.getResponseCode() != 200)
 168                 throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 169             db.beginTransaction();
 170             try {
 171                 prepareDbForRetrieval(db, profile);
 172
 173                 int matchedTransactionsCount = 0;
 174
 175
 176                 ParserState state = ParserState.EXPECTING_ACCOUNT;
 177                 String line;
 178                 BufferedReader buf =
 179                         new BufferedReader(new InputStreamReader(resp, StandardCharsets.UTF_8));
 180
 181                 int processedTransactionCount = 0;
 182                 int transactionId = 0;
 183                 LedgerTransaction transaction = null;
 184                 LINES:
 185                 while ((line = buf.readLine()) != null) {
 186                     throwIfCancelled();
 187                     Matcher m;
 188                     m = reComment.matcher(line);
 189                     if (m.find()) {
 190                         // TODO: comments are ignored for now
 191 //                            Log.v("transaction-parser", "Ignoring comment");
 192                         continue;
 193                     }
 194                     //L(String.format("State is %d", updating));
 195                     switch (state) {
 196                         case EXPECTING_ACCOUNT:
 197                             if (line.equals("<h2>General Journal</h2>")) {
 198                                 state = ParserState.EXPECTING_TRANSACTION;
 199                                 L("→ expecting transaction");
 200                                 // commit the current transaction and start a new one
 201                                 // the account list in the UI should reflect the (committed)
 202                                 // state of the database
 203                                 db.setTransactionSuccessful();
 204                                 db.endTransaction();
 205                                 profile.setAccounts(accountList);
 206                                 db.beginTransaction();
 207                                 continue;
 208                             }
 209                             m = reAccountName.matcher(line);
 210                             if (m.find()) {
 211                                 String acct_encoded = m.group(1);
 212                                 String acct_name = URLDecoder.decode(acct_encoded, "UTF-8");
 213                                 acct_name = acct_name.replace("\"", "");
 214                                 L(String.format("found account: %s", acct_name));
 215
 216                                 prevAccount = lastAccount;
 217                                 lastAccount = profile.tryLoadAccount(db, acct_name);
 218                                 if (lastAccount == null)
 219                                     lastAccount = new LedgerAccount(profile, acct_name);
 220                                 else
 221                                     lastAccount.removeAmounts();
 222                                 profile.storeAccount(db, lastAccount);
 223
 224                                 if (prevAccount != null)
 225                                     prevAccount.setHasSubAccounts(
 226                                             prevAccount.isParentOf(lastAccount));
 227                                 // make sure the parent account(s) are present,
 228                                 // synthesising them if necessary
 229                                 // this happens when the (missing-in-HTML) parent account has
 230                                 // only one child so we create a synthetic parent account record,
 231                                 // copying the amounts when child's amounts are parsed
 232                                 String parentName = lastAccount.getParentName();
 233                                 if (parentName != null) {
 234                                     Stack<String> toAppend = new Stack<>();
 235                                     while (parentName != null) {
 236                                         if (accountNames.containsKey(parentName))
 237                                             break;
 238                                         toAppend.push(parentName);
 239                                         parentName = new LedgerAccount(profile, parentName).getParentName();
 240                                     }
 241                                     syntheticAccounts.clear();
 242                                     while (!toAppend.isEmpty()) {
 243                                         String aName = toAppend.pop();
 244                                         LedgerAccount acc = profile.tryLoadAccount(db, aName);
 245                                         if (acc == null) {
 246                                             acc = new LedgerAccount(profile, aName);
 247                                             acc.setExpanded(!lastAccount.hasSubAccounts() ||
 248                                                             lastAccount.isExpanded());
 249                                         }
 250                                         acc.setHasSubAccounts(true);
 251                                         acc.removeAmounts();    // filled below when amounts are
 252                                         // parsed
 253                                         if (acc.isVisible(accountList))
 254                                             accountList.add(acc);
 255                                         L(String.format("gap-filling with %s", aName));
 256                                         accountNames.put(aName, null);
 257                                         profile.storeAccount(db, acc);
 258                                         syntheticAccounts.put(aName, acc);
 259                                     }
 260                                 }
 261
 262                                 if (lastAccount.isVisible(accountList))
 263                                     accountList.add(lastAccount);
 264                                 accountNames.put(acct_name, null);
 265
 266                                 state = ParserState.EXPECTING_ACCOUNT_AMOUNT;
 267                                 L("→ expecting account amount");
 268                             }
 269                             break;
 270
 271                         case EXPECTING_ACCOUNT_AMOUNT:
 272                             m = reAccountValue.matcher(line);
 273                             boolean match_found = false;
 274                             while (m.find()) {
 275                                 throwIfCancelled();
 276
 277                                 match_found = true;
 278                                 String value = m.group(1);
 279                                 String currency = m.group(2);
 280                                 if (currency == null)
 281                                     currency = "";
 282
 283                                 {
 284                                     Matcher tmpM = reDecimalComma.matcher(value);
 285                                     if (tmpM.find()) {
 286                                         value = value.replace(".", "");
 287                                         value = value.replace(',', '.');
 288                                     }
 289
 290                                     tmpM = reDecimalPoint.matcher(value);
 291                                     if (tmpM.find()) {
 292                                         value = value.replace(",", "");
 293                                         value = value.replace(" ", "");
 294                                     }
 295                                 }
 296                                 L("curr=" + currency + ", value=" + value);
 297                                 final float val = Float.parseFloat(value);
 298                                 profile.storeAccountValue(db, lastAccount.getName(), currency, val);
 299                                 lastAccount.addAmount(val, currency);
 300                                 for (LedgerAccount syn : syntheticAccounts.values()) {
 301                                     L(String.format(Locale.ENGLISH, "propagating %s %1.2f to %s",
 302                                             currency, val, syn.getName()));
 303                                     syn.addAmount(val, currency);
 304                                     profile.storeAccountValue(db, syn.getName(), currency, val);
 305                                 }
 306                             }
 307
 308                             if (match_found) {
 309                                 syntheticAccounts.clear();
 310                                 state = ParserState.EXPECTING_ACCOUNT;
 311                                 L("→ expecting account");
 312                             }
 313
 314                             break;
 315
 316                         case EXPECTING_TRANSACTION:
 317                             if (!line.isEmpty() && (line.charAt(0) == ' '))
 318                                 continue;
 319                             m = reTransactionStart.matcher(line);
 320                             if (m.find()) {
 321                                 transactionId = Integer.valueOf(m.group(1));
 322                                 state = ParserState.EXPECTING_TRANSACTION_DESCRIPTION;
 323                                 L(String.format(Locale.ENGLISH,
 324                                         "found transaction %d → expecting description",
 325                                         transactionId));
 326                                 progress.setProgress(++processedTransactionCount);
 327                                 if (maxTransactionId < transactionId)
 328                                     maxTransactionId = transactionId;
 329                                 if ((progress.getTotal() == Progress.INDETERMINATE) ||
 330                                     (progress.getTotal() < transactionId))
 331                                     progress.setTotal(transactionId);
 332                                 publishProgress(progress);
 333                             }
 334                             m = reEnd.matcher(line);
 335                             if (m.find()) {
 336                                 L("--- transaction value complete ---");
 337                                 break LINES;
 338                             }
 339                             break;
 340
 341                         case EXPECTING_TRANSACTION_DESCRIPTION:
 342                             if (!line.isEmpty() && (line.charAt(0) == ' '))
 343                                 continue;
 344                             m = reTransactionDescription.matcher(line);
 345                             if (m.find()) {
 346                                 if (transactionId == 0)
 347                                     throw new TransactionParserException(
 348                                             "Transaction Id is 0 while expecting " + "description");
 349
 350                                 String date = m.group(1);
 351                                 try {
 352                                     int equalsIndex = date.indexOf('=');
 353                                     if (equalsIndex >= 0)
 354                                         date = date.substring(equalsIndex + 1);
 355                                     transaction =
 356                                             new LedgerTransaction(transactionId, date, m.group(2));
 357                                 }
 358                                 catch (ParseException e) {
 359                                     e.printStackTrace();
 360                                     return String.format("Error parsing date '%s'", date);
 361                                 }
 362                                 state = ParserState.EXPECTING_TRANSACTION_DETAILS;
 363                                 L(String.format(Locale.ENGLISH,
 364                                         "transaction %d created for %s (%s) →" +
 365                                         " expecting details", transactionId, date, m.group(2)));
 366                             }
 367                             break;
 368
 369                         case EXPECTING_TRANSACTION_DETAILS:
 370                             if (line.isEmpty()) {
 371                                 // transaction data collected
 372                                 if (transaction.existsInDb(db)) {
 373                                     profile.markTransactionAsPresent(db, transaction);
 374                                     matchedTransactionsCount++;
 375
 376                                     if (matchedTransactionsCount == MATCHING_TRANSACTIONS_LIMIT) {
 377                                         profile.markTransactionsBeforeTransactionAsPresent(db,
 378                                                 transaction);
 379                                         progress.setTotal(progress.getProgress());
 380                                         publishProgress(progress);
 381                                         break LINES;
 382                                     }
 383                                 }
 384                                 else {
 385                                     profile.storeTransaction(db, transaction);
 386                                     matchedTransactionsCount = 0;
 387                                     progress.setTotal(maxTransactionId);
 388                                 }
 389
 390                                 state = ParserState.EXPECTING_TRANSACTION;
 391                                 L(String.format("transaction %s saved → expecting transaction",
 392                                         transaction.getId()));
 393                                 transaction.finishLoading();
 394
 395 // sounds like a good idea, but transaction-1 may not be the first one chronologically
 396 // for example, when you add the initial seeding transaction after entering some others
 397 //                                            if (transactionId == 1) {
 398 //                                                L("This was the initial transaction.
 399 //                                                Terminating " +
 400 //                                                  "parser");
 401 //                                                break LINES;
 402 //                                            }
 403                             }
 404                             else {
 405                                 LedgerTransactionAccount lta = parseTransactionAccountLine(line);
 406                                 if (lta != null) {
 407                                     transaction.addAccount(lta);
 408                                     L(String.format(Locale.ENGLISH, "%d: %s = %s",
 409                                             transaction.getId(), lta.getAccountName(),
 410                                             lta.getAmount()));
 411                                 }
 412                                 else
 413                                     throw new IllegalStateException(
 414                                             String.format("Can't parse transaction %d details: %s",
 415                                                     transactionId, line));
 416                             }
 417                             break;
 418                         default:
 419                             throw new RuntimeException(
 420                                     String.format("Unknown parser updating %s", state.name()));
 421                     }
 422                 }
 423
 424                 throwIfCancelled();
 425
 426                 profile.deleteNotPresentTransactions(db);
 427                 db.setTransactionSuccessful();
 428
 429                 profile.setLastUpdateStamp();
 430
 431                 return null;
 432             }
 433             finally {
 434                 db.endTransaction();
 435             }
 436         }
 437     }
 438     private void prepareDbForRetrieval(SQLiteDatabase db, MobileLedgerProfile profile) {
 439         db.execSQL("UPDATE transactions set keep=0 where profile=?",
 440                 new String[]{profile.getUuid()});
 441         db.execSQL("update account_values set keep=0 where profile=?;",
 442                 new String[]{profile.getUuid()});
 443         db.execSQL("update accounts set keep=0 where profile=?;", new String[]{profile.getUuid()});
 444     }
 445     private boolean retrieveAccountList() throws IOException, HTTPException {
 446         Progress progress = new Progress();
 447
 448         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "accounts");
 449         http.setAllowUserInteraction(false);
 450         switch (http.getResponseCode()) {
 451             case 200:
 452                 break;
 453             case 404:
 454                 return false;
 455             default:
 456                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 457         }
 458         publishProgress(progress);
 459         SQLiteDatabase db = App.getDatabase();
 460         ArrayList<LedgerAccount> accountList = new ArrayList<>();
 461         boolean listFilledOK = false;
 462         try (InputStream resp = http.getInputStream()) {
 463             if (http.getResponseCode() != 200)
 464                 throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 465
 466             db.beginTransaction();
 467             try {
 468                 profile.markAccountsAsNotPresent(db);
 469
 470                 AccountListParser parser = new AccountListParser(resp);
 471
 472                 LedgerAccount prevAccount = null;
 473
 474                 while (true) {
 475                     throwIfCancelled();
 476                     ParsedLedgerAccount parsedAccount = parser.nextAccount();
 477                     if (parsedAccount == null)
 478                         break;
 479
 480                     LedgerAccount acc = profile.tryLoadAccount(db, parsedAccount.getAname());
 481                     if (acc == null)
 482                         acc = new LedgerAccount(profile, parsedAccount.getAname());
 483                     else
 484                         acc.removeAmounts();
 485
 486                     profile.storeAccount(db, acc);
 487                     String lastCurrency = null;
 488                     float lastCurrencyAmount = 0;
 489                     for (ParsedBalance b : parsedAccount.getAibalance()) {
 490                         final String currency = b.getAcommodity();
 491                         final float amount = b.getAquantity()
 492                                               .asFloat();
 493                         if (currency.equals(lastCurrency))
 494                             lastCurrencyAmount += amount;
 495                         else {
 496                             if (lastCurrency != null) {
 497                                 profile.storeAccountValue(db, acc.getName(), lastCurrency,
 498                                         lastCurrencyAmount);
 499                                 acc.addAmount(lastCurrencyAmount, lastCurrency);
 500                             }
 501                             lastCurrency = currency;
 502                             lastCurrencyAmount = amount;
 503                         }
 504                     }
 505                     if (lastCurrency != null) {
 506                         profile.storeAccountValue(db, acc.getName(), lastCurrency,
 507                                 lastCurrencyAmount);
 508                         acc.addAmount(lastCurrencyAmount, lastCurrency);
 509                     }
 510
 511                     if (acc.isVisible(accountList))
 512                         accountList.add(acc);
 513
 514                     if (prevAccount != null) {
 515                         prevAccount.setHasSubAccounts(acc.getName()
 516                                                          .startsWith(prevAccount.getName() + ":"));
 517                     }
 518
 519                     prevAccount = acc;
 520                 }
 521                 throwIfCancelled();
 522
 523                 profile.deleteNotPresentAccounts(db);
 524                 throwIfCancelled();
 525                 db.setTransactionSuccessful();
 526             }
 527             finally {
 528                 db.endTransaction();
 529             }
 530         }
 531
 532         profile.setAccounts(accountList);
 533
 534         return true;
 535     }
 536     private boolean retrieveTransactionList() throws IOException, ParseException, HTTPException {
 537         Progress progress = new Progress();
 538         int maxTransactionId = Progress.INDETERMINATE;
 539
 540         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "transactions");
 541         http.setAllowUserInteraction(false);
 542         publishProgress(progress);
 543         switch (http.getResponseCode()) {
 544             case 200:
 545                 break;
 546             case 404:
 547                 return false;
 548             default:
 549                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 550         }
 551         SQLiteDatabase db = App.getDatabase();
 552         try (InputStream resp = http.getInputStream()) {
 553             if (http.getResponseCode() != 200)
 554                 throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 555             throwIfCancelled();
 556             db.beginTransaction();
 557             try {
 558                 profile.markTransactionsAsNotPresent(db);
 559
 560                 int matchedTransactionsCount = 0;
 561                 TransactionListParser parser = new TransactionListParser(resp);
 562
 563                 int processedTransactionCount = 0;
 564
 565                 DetectedTransactionOrder transactionOrder = DetectedTransactionOrder.UNKNOWN;
 566                 int orderAccumulator = 0;
 567                 int lastTransactionId = 0;
 568
 569                 while (true) {
 570                     throwIfCancelled();
 571                     ParsedLedgerTransaction parsedTransaction = parser.nextTransaction();
 572                     throwIfCancelled();
 573                     if (parsedTransaction == null)
 574                         break;
 575
 576                     LedgerTransaction transaction = parsedTransaction.asLedgerTransaction();
 577                     if (transaction.getId() > lastTransactionId)
 578                         orderAccumulator++;
 579                     else
 580                         orderAccumulator--;
 581                     lastTransactionId = transaction.getId();
 582                     if (transactionOrder == DetectedTransactionOrder.UNKNOWN) {
 583                         if (orderAccumulator > 30) {
 584                             transactionOrder = DetectedTransactionOrder.FILE;
 585                             debug("rtt", String.format(Locale.ENGLISH,
 586                                     "Detected native file order after %d transactions (factor %d)",
 587                                     processedTransactionCount, orderAccumulator));
 588                             progress.setTotal(Data.transactions.size());
 589                         }
 590                         else if (orderAccumulator < -30) {
 591                             transactionOrder = DetectedTransactionOrder.REVERSE_CHRONOLOGICAL;
 592                             debug("rtt", String.format(Locale.ENGLISH,
 593                                     "Detected reverse chronological order after %d transactions " +
 594                                     "(factor %d)", processedTransactionCount, orderAccumulator));
 595                         }
 596                     }
 597
 598                     if (transaction.existsInDb(db)) {
 599                         profile.markTransactionAsPresent(db, transaction);
 600                         matchedTransactionsCount++;
 601
 602                         if ((transactionOrder == DetectedTransactionOrder.REVERSE_CHRONOLOGICAL) &&
 603                             (matchedTransactionsCount == MATCHING_TRANSACTIONS_LIMIT))
 604                         {
 605                             profile.markTransactionsBeforeTransactionAsPresent(db, transaction);
 606                             progress.setTotal(progress.getProgress());
 607                             publishProgress(progress);
 608                             db.setTransactionSuccessful();
 609                             profile.setLastUpdateStamp();
 610                             return true;
 611                         }
 612                     }
 613                     else {
 614                         profile.storeTransaction(db, transaction);
 615                         matchedTransactionsCount = 0;
 616                         progress.setTotal(maxTransactionId);
 617                     }
 618
 619
 620                     if ((transactionOrder != DetectedTransactionOrder.UNKNOWN) &&
 621                         ((progress.getTotal() == Progress.INDETERMINATE) ||
 622                          (progress.getTotal() < transaction.getId())))
 623                         progress.setTotal(transaction.getId());
 624
 625                     progress.setProgress(++processedTransactionCount);
 626                     publishProgress(progress);
 627                 }
 628
 629                 throwIfCancelled();
 630                 profile.deleteNotPresentTransactions(db);
 631                 throwIfCancelled();
 632                 db.setTransactionSuccessful();
 633                 profile.setLastUpdateStamp();
 634             }
 635             finally {
 636                 db.endTransaction();
 637             }
 638         }
 639
 640         return true;
 641     }
 642
 643     @SuppressLint("DefaultLocale")
 644     @Override
 645     protected String doInBackground(Void... params) {
 646         Data.backgroundTaskStarted();
 647         try {
 648             if (!retrieveAccountList() || !retrieveTransactionList())
 649                 return retrieveTransactionListLegacy();
 650             return null;
 651         }
 652         catch (MalformedURLException e) {
 653             e.printStackTrace();
 654             return "Invalid server URL";
 655         }
 656         catch (HTTPException e) {
 657             e.printStackTrace();
 658             return String.format("HTTP error %d: %s", e.getResponseCode(), e.getResponseMessage());
 659         }
 660         catch (IOException e) {
 661             e.printStackTrace();
 662             return e.getLocalizedMessage();
 663         }
 664         catch (ParseException e) {
 665             e.printStackTrace();
 666             return "Network error";
 667         }
 668         catch (OperationCanceledException e) {
 669             e.printStackTrace();
 670             return "Operation cancelled";
 671         }
 672         finally {
 673             Data.backgroundTaskFinished();
 674         }
 675     }
 676     private MainActivity getContext() {
 677         return contextRef.get();
 678     }
 679     private void throwIfCancelled() {
 680         if (isCancelled())
 681             throw new OperationCanceledException(null);
 682     }
 683     enum DetectedTransactionOrder {UNKNOWN, REVERSE_CHRONOLOGICAL, FILE}
 684
 685     private enum ParserState {
 686         EXPECTING_ACCOUNT, EXPECTING_ACCOUNT_AMOUNT, EXPECTING_JOURNAL, EXPECTING_TRANSACTION,
 687         EXPECTING_TRANSACTION_DESCRIPTION, EXPECTING_TRANSACTION_DETAILS
 688     }
 689
 690     public class Progress {
 691         public static final int INDETERMINATE = -1;
 692         private int progress;
 693         private int total;
 694         Progress() {
 695             this(INDETERMINATE, INDETERMINATE);
 696         }
 697         Progress(int progress, int total) {
 698             this.progress = progress;
 699             this.total = total;
 700         }
 701         public int getProgress() {
 702             return progress;
 703         }
 704         protected void setProgress(int progress) {
 705             this.progress = progress;
 706         }
 707         public int getTotal() {
 708             return total;
 709         }
 710         protected void setTotal(int total) {
 711             this.total = total;
 712         }
 713     }
 714
 715     private class TransactionParserException extends IllegalStateException {
 716         TransactionParserException(String message) {
 717             super(message);
 718         }
 719     }
 720 }