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

   1 /*
   2  * Copyright © 2019 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.activity;
  19
  20 import androidx.annotation.NonNull;
  21 import androidx.lifecycle.LifecycleOwner;
  22 import androidx.lifecycle.LiveData;
  23 import androidx.lifecycle.MutableLiveData;
  24 import androidx.lifecycle.Observer;
  25 import androidx.lifecycle.ViewModel;
  26
  27 import net.ktnx.mobileledger.model.Currency;
  28 import net.ktnx.mobileledger.model.Data;
  29 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  30 import net.ktnx.mobileledger.model.MobileLedgerProfile;
  31
  32 import org.jetbrains.annotations.NotNull;
  33
  34 import java.util.ArrayList;
  35 import java.util.Calendar;
  36 import java.util.Collections;
  37 import java.util.Date;
  38 import java.util.GregorianCalendar;
  39 import java.util.Locale;
  40 import java.util.concurrent.atomic.AtomicInteger;
  41 import java.util.regex.Matcher;
  42 import java.util.regex.Pattern;
  43
  44 public class NewTransactionModel extends ViewModel {
  45     private static final Pattern reYMD =
  46             Pattern.compile("^\\s*(\\d+)\\d*/\\s*(\\d+)\\s*/\\s*(\\d+)\\s*$");
  47     private static final Pattern reMD = Pattern.compile("^\\s*(\\d+)\\s*/\\s*(\\d+)\\s*$");
  48     private static final Pattern reD = Pattern.compile("\\s*(\\d+)\\s*$");
  49     final MutableLiveData<Boolean> showCurrency = new MutableLiveData<>(false);
  50     final ArrayList<Item> items = new ArrayList<>();
  51     final MutableLiveData<Boolean> isSubmittable = new MutableLiveData<>(false);
  52     final MutableLiveData<Boolean> showComments = new MutableLiveData<>(true);
  53     private final Item header = new Item(this, null, "");
  54     private final Item trailer = new Item(this);
  55     private final MutableLiveData<Integer> focusedItem = new MutableLiveData<>(0);
  56     private final MutableLiveData<Integer> accountCount = new MutableLiveData<>(0);
  57     private final MutableLiveData<Boolean> simulateSave = new MutableLiveData<>(false);
  58     private final AtomicInteger busyCounter = new AtomicInteger(0);
  59     private final MutableLiveData<Boolean> busyFlag = new MutableLiveData<>(false);
  60     private boolean observingDataProfile;
  61     private Observer<MobileLedgerProfile> profileObserver =
  62             profile -> showCurrency.postValue(profile.getShowCommodityByDefault());
  63     void observeShowComments(LifecycleOwner owner, Observer<? super Boolean> observer) {
  64         showComments.observe(owner, observer);
  65     }
  66     void observeBusyFlag(@NonNull LifecycleOwner owner, Observer<? super Boolean> observer) {
  67         busyFlag.observe(owner, observer);
  68     }
  69     void observeDataProfile(LifecycleOwner activity) {
  70         if (!observingDataProfile)
  71             Data.profile.observe(activity, profileObserver);
  72         observingDataProfile = true;
  73     }
  74     boolean getSimulateSave() {
  75         return simulateSave.getValue();
  76     }
  77     public void setSimulateSave(boolean simulateSave) {
  78         this.simulateSave.setValue(simulateSave);
  79     }
  80     void toggleSimulateSave() {
  81         simulateSave.setValue(!simulateSave.getValue());
  82     }
  83     void observeSimulateSave(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
  84                              @NonNull androidx.lifecycle.Observer<? super Boolean> observer) {
  85         this.simulateSave.observe(owner, observer);
  86     }
  87     int getAccountCount() {
  88         return items.size();
  89     }
  90     public Date getDate() {
  91         return header.date.getValue();
  92     }
  93     public String getDescription() {
  94         return header.description.getValue();
  95     }
  96     public String getComment() {
  97         return header.comment.getValue();
  98     }
  99     LiveData<Boolean> isSubmittable() {
 100         return this.isSubmittable;
 101     }
 102     void reset() {
 103         header.date.setValue(null);
 104         header.description.setValue(null);
 105         header.comment.setValue(null);
 106         items.clear();
 107         items.add(new Item(this, new LedgerTransactionAccount("")));
 108         items.add(new Item(this, new LedgerTransactionAccount("")));
 109         focusedItem.setValue(0);
 110     }
 111     void observeFocusedItem(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 112                             @NonNull androidx.lifecycle.Observer<? super Integer> observer) {
 113         this.focusedItem.observe(owner, observer);
 114     }
 115     void stopObservingFocusedItem(@NonNull androidx.lifecycle.Observer<? super Integer> observer) {
 116         this.focusedItem.removeObserver(observer);
 117     }
 118     void observeAccountCount(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 119                              @NonNull androidx.lifecycle.Observer<? super Integer> observer) {
 120         this.accountCount.observe(owner, observer);
 121     }
 122     void stopObservingAccountCount(@NonNull androidx.lifecycle.Observer<? super Integer> observer) {
 123         this.accountCount.removeObserver(observer);
 124     }
 125     int getFocusedItem() { return focusedItem.getValue(); }
 126     void setFocusedItem(int position) {
 127         focusedItem.setValue(position);
 128     }
 129     int addAccount(LedgerTransactionAccount acc) {
 130         items.add(new Item(this, acc));
 131         accountCount.setValue(getAccountCount());
 132         return items.size();
 133     }
 134     boolean accountsInInitialState() {
 135         for (Item item : items) {
 136             LedgerTransactionAccount acc = item.getAccount();
 137             if (acc.isAmountSet())
 138                 return false;
 139             if (!acc.getAccountName()
 140                     .trim()
 141                     .isEmpty())
 142                 return false;
 143         }
 144
 145         return true;
 146     }
 147     LedgerTransactionAccount getAccount(int index) {
 148         return items.get(index)
 149                     .getAccount();
 150     }
 151     Item getItem(int index) {
 152         if (index == 0) {
 153             return header;
 154         }
 155
 156         if (index <= items.size())
 157             return items.get(index - 1);
 158
 159         return trailer;
 160     }
 161     void removeRow(Item item, NewTransactionItemsAdapter adapter) {
 162         int pos = items.indexOf(item);
 163         items.remove(pos);
 164         if (adapter != null) {
 165             adapter.notifyItemRemoved(pos + 1);
 166             sendCountNotifications();
 167         }
 168     }
 169     void removeItem(int pos) {
 170         items.remove(pos);
 171         accountCount.setValue(getAccountCount());
 172     }
 173     void sendCountNotifications() {
 174         accountCount.setValue(getAccountCount());
 175     }
 176     public void sendFocusedNotification() {
 177         focusedItem.setValue(focusedItem.getValue());
 178     }
 179     void updateFocusedItem(int position) {
 180         focusedItem.setValue(position);
 181     }
 182     void noteFocusChanged(int position, FocusedElement element) {
 183         getItem(position).setFocusedElement(element);
 184     }
 185     void swapItems(int one, int two) {
 186         Collections.swap(items, one - 1, two - 1);
 187     }
 188     void moveItemLast(int index) {
 189         /*   0
 190              1   <-- index
 191              2
 192              3   <-- desired position
 193          */
 194         int itemCount = items.size();
 195
 196         if (index < itemCount - 1) {
 197             Item acc = items.remove(index);
 198             items.add(itemCount - 1, acc);
 199         }
 200     }
 201     void toggleCurrencyVisible() {
 202         showCurrency.setValue(!showCurrency.getValue());
 203     }
 204     void stopObservingBusyFlag(Observer<Boolean> observer) {
 205         busyFlag.removeObserver(observer);
 206     }
 207     void incrementBusyCounter() {
 208         int newValue = busyCounter.incrementAndGet();
 209         if (newValue == 1)
 210             busyFlag.postValue(true);
 211     }
 212     void decrementBusyCounter() {
 213         int newValue = busyCounter.decrementAndGet();
 214         if (newValue == 0)
 215             busyFlag.postValue(false);
 216     }
 217     public boolean getBusyFlag() {
 218         return busyFlag.getValue();
 219     }
 220     public void toggleShowComments() {
 221         showComments.setValue(!showComments.getValue());
 222     }
 223     enum ItemType {generalData, transactionRow, bottomFiller}
 224
 225     enum FocusedElement {Account, Comment, Amount, Description, TransactionComment}
 226
 227
 228     //==========================================================================================
 229
 230
 231     static class Item {
 232         private ItemType type;
 233         private MutableLiveData<Date> date = new MutableLiveData<>();
 234         private MutableLiveData<String> description = new MutableLiveData<>();
 235         private LedgerTransactionAccount account;
 236         private MutableLiveData<String> amountHint = new MutableLiveData<>(null);
 237         private NewTransactionModel model;
 238         private MutableLiveData<Boolean> editable = new MutableLiveData<>(true);
 239         private FocusedElement focusedElement = FocusedElement.Account;
 240         private MutableLiveData<String> comment = new MutableLiveData<>(null);
 241         private MutableLiveData<Currency> currency = new MutableLiveData<>(null);
 242         private boolean amountHintIsSet = false;
 243         Item(NewTransactionModel model) {
 244             this.model = model;
 245             type = ItemType.bottomFiller;
 246             editable.setValue(false);
 247         }
 248         Item(NewTransactionModel model, Date date, String description) {
 249             this.model = model;
 250             this.type = ItemType.generalData;
 251             this.date.setValue(date);
 252             this.description.setValue(description);
 253             this.editable.setValue(true);
 254         }
 255         Item(NewTransactionModel model, LedgerTransactionAccount account) {
 256             this.model = model;
 257             this.type = ItemType.transactionRow;
 258             this.account = account;
 259             String currName = account.getCurrency();
 260             Currency curr = null;
 261             if ((currName != null) && !currName.isEmpty())
 262                 curr = Currency.loadByName(currName);
 263             this.currency.setValue(curr);
 264             this.editable.setValue(true);
 265         }
 266         FocusedElement getFocusedElement() {
 267             return focusedElement;
 268         }
 269         void setFocusedElement(FocusedElement focusedElement) {
 270             this.focusedElement = focusedElement;
 271         }
 272         public NewTransactionModel getModel() {
 273             return model;
 274         }
 275         void setEditable(boolean editable) {
 276             ensureType(ItemType.generalData, ItemType.transactionRow);
 277             this.editable.setValue(editable);
 278         }
 279         private void ensureType(ItemType type1, ItemType type2) {
 280             if ((type != type1) && (type != type2)) {
 281                 throw new RuntimeException(
 282                         String.format("Actual type (%s) differs from wanted (%s or %s)", type,
 283                                 type1, type2));
 284             }
 285         }
 286         String getAmountHint() {
 287             ensureType(ItemType.transactionRow);
 288             return amountHint.getValue();
 289         }
 290         void setAmountHint(String amountHint) {
 291             ensureType(ItemType.transactionRow);
 292
 293             // avoid unnecessary triggers
 294             if (amountHint == null) {
 295                 if (this.amountHint.getValue() == null)
 296                     return;
 297                 amountHintIsSet = false;
 298             }
 299             else {
 300                 if (amountHint.equals(this.amountHint.getValue()))
 301                     return;
 302                 amountHintIsSet = true;
 303             }
 304
 305             this.amountHint.setValue(amountHint);
 306         }
 307         void observeAmountHint(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 308                                @NonNull androidx.lifecycle.Observer<? super String> observer) {
 309             this.amountHint.observe(owner, observer);
 310         }
 311         void stopObservingAmountHint(
 312                 @NonNull androidx.lifecycle.Observer<? super String> observer) {
 313             this.amountHint.removeObserver(observer);
 314         }
 315         ItemType getType() {
 316             return type;
 317         }
 318         void ensureType(ItemType wantedType) {
 319             if (type != wantedType) {
 320                 throw new RuntimeException(
 321                         String.format("Actual type (%s) differs from wanted (%s)", type,
 322                                 wantedType));
 323             }
 324         }
 325         public Date getDate() {
 326             ensureType(ItemType.generalData);
 327             return date.getValue();
 328         }
 329         public void setDate(Date date) {
 330             ensureType(ItemType.generalData);
 331             this.date.setValue(date);
 332         }
 333         public void setDate(String text) {
 334             if ((text == null) || text.trim()
 335                                       .isEmpty())
 336             {
 337                 setDate((Date) null);
 338                 return;
 339             }
 340
 341             int year, month, day;
 342             final Calendar c = GregorianCalendar.getInstance();
 343             Matcher m = reYMD.matcher(text);
 344             if (m.matches()) {
 345                 year = Integer.parseInt(m.group(1));
 346                 month = Integer.parseInt(m.group(2)) - 1;   // month is 0-based
 347                 day = Integer.parseInt(m.group(3));
 348             }
 349             else {
 350                 year = c.get(Calendar.YEAR);
 351                 m = reMD.matcher(text);
 352                 if (m.matches()) {
 353                     month = Integer.parseInt(m.group(1)) - 1;
 354                     day = Integer.parseInt(m.group(2));
 355                 }
 356                 else {
 357                     month = c.get(Calendar.MONTH);
 358                     m = reD.matcher(text);
 359                     if (m.matches()) {
 360                         day = Integer.parseInt(m.group(1));
 361                     }
 362                     else {
 363                         day = c.get(Calendar.DAY_OF_MONTH);
 364                     }
 365                 }
 366             }
 367
 368             c.set(year, month, day);
 369
 370             this.setDate(c.getTime());
 371         }
 372         void observeDate(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 373                          @NonNull androidx.lifecycle.Observer<? super Date> observer) {
 374             this.date.observe(owner, observer);
 375         }
 376         void stopObservingDate(@NonNull androidx.lifecycle.Observer<? super Date> observer) {
 377             this.date.removeObserver(observer);
 378         }
 379         public String getDescription() {
 380             ensureType(ItemType.generalData);
 381             return description.getValue();
 382         }
 383         public void setDescription(String description) {
 384             ensureType(ItemType.generalData);
 385             this.description.setValue(description);
 386         }
 387         void observeDescription(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 388                                 @NonNull androidx.lifecycle.Observer<? super String> observer) {
 389             this.description.observe(owner, observer);
 390         }
 391         void stopObservingDescription(
 392                 @NonNull androidx.lifecycle.Observer<? super String> observer) {
 393             this.description.removeObserver(observer);
 394         }
 395         public String getTransactionComment() {
 396             ensureType(ItemType.generalData);
 397             return comment.getValue();
 398         }
 399         public void setTransactionComment(String transactionComment) {
 400             ensureType(ItemType.generalData);
 401             this.comment.setValue(transactionComment);
 402         }
 403         void observeTransactionComment(@NonNull @NotNull LifecycleOwner owner,
 404                                        @NonNull Observer<? super String> observer) {
 405             ensureType(ItemType.generalData);
 406             this.comment.observe(owner, observer);
 407         }
 408         void stopObservingTransactionComment(@NonNull Observer<? super String> observer) {
 409             ensureType(ItemType.generalData);
 410             this.comment.removeObserver(observer);
 411         }
 412         public LedgerTransactionAccount getAccount() {
 413             ensureType(ItemType.transactionRow);
 414             return account;
 415         }
 416         public void setAccountName(String name) {
 417             account.setAccountName(name);
 418         }
 419         /**
 420          * getFormattedDate()
 421          *
 422          * @return nicely formatted, shortest available date representation
 423          */
 424         String getFormattedDate() {
 425             if (date == null)
 426                 return null;
 427             Date time = date.getValue();
 428             if (time == null)
 429                 return null;
 430
 431             Calendar c = GregorianCalendar.getInstance();
 432             c.setTime(time);
 433             Calendar today = GregorianCalendar.getInstance();
 434
 435             final int myYear = c.get(Calendar.YEAR);
 436             final int myMonth = c.get(Calendar.MONTH);
 437             final int myDay = c.get(Calendar.DAY_OF_MONTH);
 438
 439             if (today.get(Calendar.YEAR) != myYear) {
 440                 return String.format(Locale.US, "%d/%02d/%02d", myYear, myMonth + 1, myDay);
 441             }
 442
 443             if (today.get(Calendar.MONTH) != myMonth) {
 444                 return String.format(Locale.US, "%d/%02d", myMonth + 1, myDay);
 445             }
 446
 447             return String.valueOf(myDay);
 448         }
 449         void observeEditableFlag(NewTransactionActivity activity, Observer<Boolean> observer) {
 450             editable.observe(activity, observer);
 451         }
 452         void stopObservingEditableFlag(Observer<Boolean> observer) {
 453             editable.removeObserver(observer);
 454         }
 455         void observeComment(NewTransactionActivity activity, Observer<String> observer) {
 456             comment.observe(activity, observer);
 457         }
 458         void stopObservingComment(Observer<String> observer) {
 459             comment.removeObserver(observer);
 460         }
 461         public void setComment(String comment) {
 462             getAccount().setComment(comment);
 463             this.comment.postValue(comment);
 464         }
 465         public Currency getCurrency() {
 466             return this.currency.getValue();
 467         }
 468         public void setCurrency(Currency currency) {
 469             Currency present = this.currency.getValue();
 470             if ((currency == null) && (present != null) ||
 471                 (currency != null) && !currency.equals(present))
 472             {
 473                 getAccount().setCurrency((currency != null && !currency.getName()
 474                                                                        .isEmpty())
 475                                          ? currency.getName() : null);
 476                 this.currency.setValue(currency);
 477             }
 478         }
 479         void observeCurrency(NewTransactionActivity activity, Observer<Currency> observer) {
 480             currency.observe(activity, observer);
 481         }
 482         void stopObservingCurrency(Observer<Currency> observer) {
 483             currency.removeObserver(observer);
 484         }
 485         boolean isOfType(ItemType type) {
 486             return this.type == type;
 487         }
 488         boolean isAmountHintSet() {
 489             return amountHintIsSet;
 490         }
 491     }
 492 }