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     private final Item header = new Item(this, null, "");
  53     private final Item trailer = new Item(this);
  54     private final MutableLiveData<Integer> focusedItem = new MutableLiveData<>(0);
  55     private final MutableLiveData<Integer> accountCount = new MutableLiveData<>(0);
  56     private final MutableLiveData<Boolean> simulateSave = new MutableLiveData<>(false);
  57     private boolean observingDataProfile;
  58     private Observer<MobileLedgerProfile> profileObserver =
  59             profile -> showCurrency.postValue(profile.getShowCommodityByDefault());
  60     private final AtomicInteger busyCounter = new AtomicInteger(0);
  61     private final MutableLiveData<Boolean> busyFlag = new MutableLiveData<>(false);
  62     final MutableLiveData<Boolean> showComments = new MutableLiveData<>(false);
  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) busyFlag.postValue(true);
 210     }
 211     void decrementBusyCounter() {
 212         int newValue = busyCounter.decrementAndGet();
 213         if (newValue == 0) busyFlag.postValue(false);
 214     }
 215     public boolean getBusyFlag() {
 216         return busyFlag.getValue();
 217     }
 218     public void toggleShowComments() {
 219         showComments.setValue(!showComments.getValue());
 220     }
 221     enum ItemType {generalData, transactionRow, bottomFiller}
 222
 223     enum FocusedElement {Account, Comment, Amount, Description, TransactionComment}
 224
 225
 226     //==========================================================================================
 227
 228
 229     static class Item {
 230         private ItemType type;
 231         private MutableLiveData<Date> date = new MutableLiveData<>();
 232         private MutableLiveData<String> description = new MutableLiveData<>();
 233         private LedgerTransactionAccount account;
 234         private MutableLiveData<String> amountHint = new MutableLiveData<>(null);
 235         private NewTransactionModel model;
 236         private MutableLiveData<Boolean> editable = new MutableLiveData<>(true);
 237         private FocusedElement focusedElement = FocusedElement.Account;
 238         private MutableLiveData<String> comment = new MutableLiveData<>(null);
 239         private MutableLiveData<Currency> currency = new MutableLiveData<>(null);
 240         private boolean amountHintIsSet = false;
 241         Item(NewTransactionModel model) {
 242             this.model = model;
 243             type = ItemType.bottomFiller;
 244             editable.setValue(false);
 245         }
 246         Item(NewTransactionModel model, Date date, String description) {
 247             this.model = model;
 248             this.type = ItemType.generalData;
 249             this.date.setValue(date);
 250             this.description.setValue(description);
 251             this.editable.setValue(true);
 252         }
 253         Item(NewTransactionModel model, LedgerTransactionAccount account) {
 254             this.model = model;
 255             this.type = ItemType.transactionRow;
 256             this.account = account;
 257             String currName = account.getCurrency();
 258             Currency curr = null;
 259             if ((currName != null) && !currName.isEmpty())
 260                 curr = Currency.loadByName(currName);
 261             this.currency.setValue(curr);
 262             this.editable.setValue(true);
 263         }
 264         FocusedElement getFocusedElement() {
 265             return focusedElement;
 266         }
 267         void setFocusedElement(FocusedElement focusedElement) {
 268             this.focusedElement = focusedElement;
 269         }
 270         public NewTransactionModel getModel() {
 271             return model;
 272         }
 273         void setEditable(boolean editable) {
 274             ensureType(ItemType.generalData, ItemType.transactionRow);
 275             this.editable.setValue(editable);
 276         }
 277         private void ensureType(ItemType type1, ItemType type2) {
 278             if ((type != type1) && (type != type2)) {
 279                 throw new RuntimeException(
 280                         String.format("Actual type (%s) differs from wanted (%s or %s)", type,
 281                                 type1, type2));
 282             }
 283         }
 284         String getAmountHint() {
 285             ensureType(ItemType.transactionRow);
 286             return amountHint.getValue();
 287         }
 288         void setAmountHint(String amountHint) {
 289             ensureType(ItemType.transactionRow);
 290
 291             // avoid unnecessary triggers
 292             if (amountHint == null) {
 293                 if (this.amountHint.getValue() == null)
 294                     return;
 295                 amountHintIsSet = false;
 296             }
 297             else {
 298                 if (amountHint.equals(this.amountHint.getValue()))
 299                     return;
 300                 amountHintIsSet = true;
 301             }
 302
 303             this.amountHint.setValue(amountHint);
 304         }
 305         void observeAmountHint(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 306                                @NonNull androidx.lifecycle.Observer<? super String> observer) {
 307             this.amountHint.observe(owner, observer);
 308         }
 309         void stopObservingAmountHint(
 310                 @NonNull androidx.lifecycle.Observer<? super String> observer) {
 311             this.amountHint.removeObserver(observer);
 312         }
 313         ItemType getType() {
 314             return type;
 315         }
 316         void ensureType(ItemType wantedType) {
 317             if (type != wantedType) {
 318                 throw new RuntimeException(
 319                         String.format("Actual type (%s) differs from wanted (%s)", type,
 320                                 wantedType));
 321             }
 322         }
 323         public Date getDate() {
 324             ensureType(ItemType.generalData);
 325             return date.getValue();
 326         }
 327         public void setDate(Date date) {
 328             ensureType(ItemType.generalData);
 329             this.date.setValue(date);
 330         }
 331         public void setDate(String text) {
 332             if ((text == null) || text.trim()
 333                                       .isEmpty())
 334             {
 335                 setDate((Date) null);
 336                 return;
 337             }
 338
 339             int year, month, day;
 340             final Calendar c = GregorianCalendar.getInstance();
 341             Matcher m = reYMD.matcher(text);
 342             if (m.matches()) {
 343                 year = Integer.parseInt(m.group(1));
 344                 month = Integer.parseInt(m.group(2)) - 1;   // month is 0-based
 345                 day = Integer.parseInt(m.group(3));
 346             }
 347             else {
 348                 year = c.get(Calendar.YEAR);
 349                 m = reMD.matcher(text);
 350                 if (m.matches()) {
 351                     month = Integer.parseInt(m.group(1)) - 1;
 352                     day = Integer.parseInt(m.group(2));
 353                 }
 354                 else {
 355                     month = c.get(Calendar.MONTH);
 356                     m = reD.matcher(text);
 357                     if (m.matches()) {
 358                         day = Integer.parseInt(m.group(1));
 359                     }
 360                     else {
 361                         day = c.get(Calendar.DAY_OF_MONTH);
 362                     }
 363                 }
 364             }
 365
 366             c.set(year, month, day);
 367
 368             this.setDate(c.getTime());
 369         }
 370         void observeDate(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 371                          @NonNull androidx.lifecycle.Observer<? super Date> observer) {
 372             this.date.observe(owner, observer);
 373         }
 374         void stopObservingDate(@NonNull androidx.lifecycle.Observer<? super Date> observer) {
 375             this.date.removeObserver(observer);
 376         }
 377         public String getDescription() {
 378             ensureType(ItemType.generalData);
 379             return description.getValue();
 380         }
 381         public void setDescription(String description) {
 382             ensureType(ItemType.generalData);
 383             this.description.setValue(description);
 384         }
 385         void observeDescription(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 386                                 @NonNull androidx.lifecycle.Observer<? super String> observer) {
 387             this.description.observe(owner, observer);
 388         }
 389         void stopObservingDescription(
 390                 @NonNull androidx.lifecycle.Observer<? super String> observer) {
 391             this.description.removeObserver(observer);
 392         }
 393         public String getTransactionComment() {
 394             ensureType(ItemType.generalData);
 395             return comment.getValue();
 396         }
 397         public void setTransactionComment(String transactionComment) {
 398             ensureType(ItemType.generalData);
 399             this.comment.setValue(transactionComment);
 400         }
 401         void observeTransactionComment(@NonNull @NotNull LifecycleOwner owner,
 402                                        @NonNull Observer<? super String> observer) {
 403             ensureType(ItemType.generalData);
 404             this.comment.observe(owner, observer);
 405         }
 406         void stopObservingTransactionComment(@NonNull Observer<? super String> observer) {
 407             ensureType(ItemType.generalData);
 408             this.comment.removeObserver(observer);
 409         }
 410         public LedgerTransactionAccount getAccount() {
 411             ensureType(ItemType.transactionRow);
 412             return account;
 413         }
 414         public void setAccountName(String name) {
 415             account.setAccountName(name);
 416         }
 417         /**
 418          * getFormattedDate()
 419          *
 420          * @return nicely formatted, shortest available date representation
 421          */
 422         String getFormattedDate() {
 423             if (date == null)
 424                 return null;
 425             Date time = date.getValue();
 426             if (time == null)
 427                 return null;
 428
 429             Calendar c = GregorianCalendar.getInstance();
 430             c.setTime(time);
 431             Calendar today = GregorianCalendar.getInstance();
 432
 433             final int myYear = c.get(Calendar.YEAR);
 434             final int myMonth = c.get(Calendar.MONTH);
 435             final int myDay = c.get(Calendar.DAY_OF_MONTH);
 436
 437             if (today.get(Calendar.YEAR) != myYear) {
 438                 return String.format(Locale.US, "%d/%02d/%02d", myYear, myMonth + 1, myDay);
 439             }
 440
 441             if (today.get(Calendar.MONTH) != myMonth) {
 442                 return String.format(Locale.US, "%d/%02d", myMonth + 1, myDay);
 443             }
 444
 445             return String.valueOf(myDay);
 446         }
 447         void observeEditableFlag(NewTransactionActivity activity, Observer<Boolean> observer) {
 448             editable.observe(activity, observer);
 449         }
 450         void stopObservingEditableFlag(Observer<Boolean> observer) {
 451             editable.removeObserver(observer);
 452         }
 453         void observeComment(NewTransactionActivity activity, Observer<String> observer) {
 454             comment.observe(activity, observer);
 455         }
 456         void stopObservingComment(Observer<String> observer) {
 457             comment.removeObserver(observer);
 458         }
 459         public void setComment(String comment) {
 460             getAccount().setComment(comment);
 461             this.comment.postValue(comment);
 462         }
 463         public Currency getCurrency() {
 464             return this.currency.getValue();
 465         }
 466         public void setCurrency(Currency currency) {
 467             Currency present = this.currency.getValue();
 468             if ((currency == null) && (present != null) ||
 469                 (currency != null) && !currency.equals(present))
 470             {
 471                 getAccount().setCurrency((currency != null && !currency.getName()
 472                                                                        .isEmpty())
 473                                          ? currency.getName() : null);
 474                 this.currency.setValue(currency);
 475             }
 476         }
 477         void observeCurrency(NewTransactionActivity activity, Observer<Currency> observer) {
 478             currency.observe(activity, observer);
 479         }
 480         void stopObservingCurrency(Observer<Currency> observer) {
 481             currency.removeObserver(observer);
 482         }
 483         boolean isOfType(ItemType type) {
 484             return this.type == type;
 485         }
 486         boolean isAmountHintSet() {
 487             return amountHintIsSet;
 488         }
 489     }
 490 }