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 = profile -> {
  62         showCurrency.postValue(profile.getShowCommodityByDefault());
  63         showComments.postValue(profile.getShowCommentsByDefault());
  64     };
  65     void observeShowComments(LifecycleOwner owner, Observer<? super Boolean> observer) {
  66         showComments.observe(owner, observer);
  67     }
  68     void observeBusyFlag(@NonNull LifecycleOwner owner, Observer<? super Boolean> observer) {
  69         busyFlag.observe(owner, observer);
  70     }
  71     void observeDataProfile(LifecycleOwner activity) {
  72         if (!observingDataProfile)
  73             Data.profile.observe(activity, profileObserver);
  74         observingDataProfile = true;
  75     }
  76     boolean getSimulateSave() {
  77         return simulateSave.getValue();
  78     }
  79     public void setSimulateSave(boolean simulateSave) {
  80         this.simulateSave.setValue(simulateSave);
  81     }
  82     void toggleSimulateSave() {
  83         simulateSave.setValue(!simulateSave.getValue());
  84     }
  85     void observeSimulateSave(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
  86                              @NonNull androidx.lifecycle.Observer<? super Boolean> observer) {
  87         this.simulateSave.observe(owner, observer);
  88     }
  89     int getAccountCount() {
  90         return items.size();
  91     }
  92     public Date getDate() {
  93         return header.date.getValue();
  94     }
  95     public String getDescription() {
  96         return header.description.getValue();
  97     }
  98     public String getComment() {
  99         return header.comment.getValue();
 100     }
 101     LiveData<Boolean> isSubmittable() {
 102         return this.isSubmittable;
 103     }
 104     void reset() {
 105         header.date.setValue(null);
 106         header.description.setValue(null);
 107         header.comment.setValue(null);
 108         items.clear();
 109         items.add(new Item(this, new LedgerTransactionAccount("")));
 110         items.add(new Item(this, new LedgerTransactionAccount("")));
 111         focusedItem.setValue(0);
 112     }
 113     void observeFocusedItem(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 114                             @NonNull androidx.lifecycle.Observer<? super Integer> observer) {
 115         this.focusedItem.observe(owner, observer);
 116     }
 117     void stopObservingFocusedItem(@NonNull androidx.lifecycle.Observer<? super Integer> observer) {
 118         this.focusedItem.removeObserver(observer);
 119     }
 120     void observeAccountCount(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 121                              @NonNull androidx.lifecycle.Observer<? super Integer> observer) {
 122         this.accountCount.observe(owner, observer);
 123     }
 124     void stopObservingAccountCount(@NonNull androidx.lifecycle.Observer<? super Integer> observer) {
 125         this.accountCount.removeObserver(observer);
 126     }
 127     int getFocusedItem() { return focusedItem.getValue(); }
 128     void setFocusedItem(int position) {
 129         focusedItem.setValue(position);
 130     }
 131     int addAccount(LedgerTransactionAccount acc) {
 132         items.add(new Item(this, acc));
 133         accountCount.setValue(getAccountCount());
 134         return items.size();
 135     }
 136     boolean accountsInInitialState() {
 137         for (Item item : items) {
 138             LedgerTransactionAccount acc = item.getAccount();
 139             if (acc.isAmountSet())
 140                 return false;
 141             if (!acc.getAccountName()
 142                     .trim()
 143                     .isEmpty())
 144                 return false;
 145         }
 146
 147         return true;
 148     }
 149     LedgerTransactionAccount getAccount(int index) {
 150         return items.get(index)
 151                     .getAccount();
 152     }
 153     Item getItem(int index) {
 154         if (index == 0) {
 155             return header;
 156         }
 157
 158         if (index <= items.size())
 159             return items.get(index - 1);
 160
 161         return trailer;
 162     }
 163     void removeRow(Item item, NewTransactionItemsAdapter adapter) {
 164         int pos = items.indexOf(item);
 165         items.remove(pos);
 166         if (adapter != null) {
 167             adapter.notifyItemRemoved(pos + 1);
 168             sendCountNotifications();
 169         }
 170     }
 171     void removeItem(int pos) {
 172         items.remove(pos);
 173         accountCount.setValue(getAccountCount());
 174     }
 175     void sendCountNotifications() {
 176         accountCount.setValue(getAccountCount());
 177     }
 178     public void sendFocusedNotification() {
 179         focusedItem.setValue(focusedItem.getValue());
 180     }
 181     void updateFocusedItem(int position) {
 182         focusedItem.setValue(position);
 183     }
 184     void noteFocusChanged(int position, FocusedElement element) {
 185         getItem(position).setFocusedElement(element);
 186     }
 187     void swapItems(int one, int two) {
 188         Collections.swap(items, one - 1, two - 1);
 189     }
 190     void moveItemLast(int index) {
 191         /*   0
 192              1   <-- index
 193              2
 194              3   <-- desired position
 195          */
 196         int itemCount = items.size();
 197
 198         if (index < itemCount - 1) {
 199             Item acc = items.remove(index);
 200             items.add(itemCount - 1, acc);
 201         }
 202     }
 203     void toggleCurrencyVisible() {
 204         showCurrency.setValue(!showCurrency.getValue());
 205     }
 206     void stopObservingBusyFlag(Observer<Boolean> observer) {
 207         busyFlag.removeObserver(observer);
 208     }
 209     void incrementBusyCounter() {
 210         int newValue = busyCounter.incrementAndGet();
 211         if (newValue == 1)
 212             busyFlag.postValue(true);
 213     }
 214     void decrementBusyCounter() {
 215         int newValue = busyCounter.decrementAndGet();
 216         if (newValue == 0)
 217             busyFlag.postValue(false);
 218     }
 219     public boolean getBusyFlag() {
 220         return busyFlag.getValue();
 221     }
 222     public void toggleShowComments() {
 223         showComments.setValue(!showComments.getValue());
 224     }
 225     enum ItemType {generalData, transactionRow, bottomFiller}
 226
 227     enum FocusedElement {Account, Comment, Amount, Description, TransactionComment}
 228
 229
 230     //==========================================================================================
 231
 232
 233     static class Item {
 234         private ItemType type;
 235         private MutableLiveData<Date> date = new MutableLiveData<>();
 236         private MutableLiveData<String> description = new MutableLiveData<>();
 237         private LedgerTransactionAccount account;
 238         private MutableLiveData<String> amountHint = new MutableLiveData<>(null);
 239         private NewTransactionModel model;
 240         private MutableLiveData<Boolean> editable = new MutableLiveData<>(true);
 241         private FocusedElement focusedElement = FocusedElement.Account;
 242         private MutableLiveData<String> comment = new MutableLiveData<>(null);
 243         private MutableLiveData<Currency> currency = new MutableLiveData<>(null);
 244         private boolean amountHintIsSet = false;
 245         Item(NewTransactionModel model) {
 246             this.model = model;
 247             type = ItemType.bottomFiller;
 248             editable.setValue(false);
 249         }
 250         Item(NewTransactionModel model, Date date, String description) {
 251             this.model = model;
 252             this.type = ItemType.generalData;
 253             this.date.setValue(date);
 254             this.description.setValue(description);
 255             this.editable.setValue(true);
 256         }
 257         Item(NewTransactionModel model, LedgerTransactionAccount account) {
 258             this.model = model;
 259             this.type = ItemType.transactionRow;
 260             this.account = account;
 261             String currName = account.getCurrency();
 262             Currency curr = null;
 263             if ((currName != null) && !currName.isEmpty())
 264                 curr = Currency.loadByName(currName);
 265             this.currency.setValue(curr);
 266             this.editable.setValue(true);
 267         }
 268         FocusedElement getFocusedElement() {
 269             return focusedElement;
 270         }
 271         void setFocusedElement(FocusedElement focusedElement) {
 272             this.focusedElement = focusedElement;
 273         }
 274         public NewTransactionModel getModel() {
 275             return model;
 276         }
 277         void setEditable(boolean editable) {
 278             ensureType(ItemType.generalData, ItemType.transactionRow);
 279             this.editable.setValue(editable);
 280         }
 281         private void ensureType(ItemType type1, ItemType type2) {
 282             if ((type != type1) && (type != type2)) {
 283                 throw new RuntimeException(
 284                         String.format("Actual type (%s) differs from wanted (%s or %s)", type,
 285                                 type1, type2));
 286             }
 287         }
 288         String getAmountHint() {
 289             ensureType(ItemType.transactionRow);
 290             return amountHint.getValue();
 291         }
 292         void setAmountHint(String amountHint) {
 293             ensureType(ItemType.transactionRow);
 294
 295             // avoid unnecessary triggers
 296             if (amountHint == null) {
 297                 if (this.amountHint.getValue() == null)
 298                     return;
 299                 amountHintIsSet = false;
 300             }
 301             else {
 302                 if (amountHint.equals(this.amountHint.getValue()))
 303                     return;
 304                 amountHintIsSet = true;
 305             }
 306
 307             this.amountHint.setValue(amountHint);
 308         }
 309         void observeAmountHint(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 310                                @NonNull androidx.lifecycle.Observer<? super String> observer) {
 311             this.amountHint.observe(owner, observer);
 312         }
 313         void stopObservingAmountHint(
 314                 @NonNull androidx.lifecycle.Observer<? super String> observer) {
 315             this.amountHint.removeObserver(observer);
 316         }
 317         ItemType getType() {
 318             return type;
 319         }
 320         void ensureType(ItemType wantedType) {
 321             if (type != wantedType) {
 322                 throw new RuntimeException(
 323                         String.format("Actual type (%s) differs from wanted (%s)", type,
 324                                 wantedType));
 325             }
 326         }
 327         public Date getDate() {
 328             ensureType(ItemType.generalData);
 329             return date.getValue();
 330         }
 331         public void setDate(Date date) {
 332             ensureType(ItemType.generalData);
 333             this.date.setValue(date);
 334         }
 335         public void setDate(String text) {
 336             if ((text == null) || text.trim()
 337                                       .isEmpty())
 338             {
 339                 setDate((Date) null);
 340                 return;
 341             }
 342
 343             int year, month, day;
 344             final Calendar c = GregorianCalendar.getInstance();
 345             Matcher m = reYMD.matcher(text);
 346             if (m.matches()) {
 347                 year = Integer.parseInt(m.group(1));
 348                 month = Integer.parseInt(m.group(2)) - 1;   // month is 0-based
 349                 day = Integer.parseInt(m.group(3));
 350             }
 351             else {
 352                 year = c.get(Calendar.YEAR);
 353                 m = reMD.matcher(text);
 354                 if (m.matches()) {
 355                     month = Integer.parseInt(m.group(1)) - 1;
 356                     day = Integer.parseInt(m.group(2));
 357                 }
 358                 else {
 359                     month = c.get(Calendar.MONTH);
 360                     m = reD.matcher(text);
 361                     if (m.matches()) {
 362                         day = Integer.parseInt(m.group(1));
 363                     }
 364                     else {
 365                         day = c.get(Calendar.DAY_OF_MONTH);
 366                     }
 367                 }
 368             }
 369
 370             c.set(year, month, day);
 371
 372             this.setDate(c.getTime());
 373         }
 374         void observeDate(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 375                          @NonNull androidx.lifecycle.Observer<? super Date> observer) {
 376             this.date.observe(owner, observer);
 377         }
 378         void stopObservingDate(@NonNull androidx.lifecycle.Observer<? super Date> observer) {
 379             this.date.removeObserver(observer);
 380         }
 381         public String getDescription() {
 382             ensureType(ItemType.generalData);
 383             return description.getValue();
 384         }
 385         public void setDescription(String description) {
 386             ensureType(ItemType.generalData);
 387             this.description.setValue(description);
 388         }
 389         void observeDescription(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 390                                 @NonNull androidx.lifecycle.Observer<? super String> observer) {
 391             this.description.observe(owner, observer);
 392         }
 393         void stopObservingDescription(
 394                 @NonNull androidx.lifecycle.Observer<? super String> observer) {
 395             this.description.removeObserver(observer);
 396         }
 397         public String getTransactionComment() {
 398             ensureType(ItemType.generalData);
 399             return comment.getValue();
 400         }
 401         public void setTransactionComment(String transactionComment) {
 402             ensureType(ItemType.generalData);
 403             this.comment.setValue(transactionComment);
 404         }
 405         void observeTransactionComment(@NonNull @NotNull LifecycleOwner owner,
 406                                        @NonNull Observer<? super String> observer) {
 407             ensureType(ItemType.generalData);
 408             this.comment.observe(owner, observer);
 409         }
 410         void stopObservingTransactionComment(@NonNull Observer<? super String> observer) {
 411             this.comment.removeObserver(observer);
 412         }
 413         public LedgerTransactionAccount getAccount() {
 414             ensureType(ItemType.transactionRow);
 415             return account;
 416         }
 417         public void setAccountName(String name) {
 418             account.setAccountName(name);
 419         }
 420         /**
 421          * getFormattedDate()
 422          *
 423          * @return nicely formatted, shortest available date representation
 424          */
 425         String getFormattedDate() {
 426             if (date == null)
 427                 return null;
 428             Date time = date.getValue();
 429             if (time == null)
 430                 return null;
 431
 432             Calendar c = GregorianCalendar.getInstance();
 433             c.setTime(time);
 434             Calendar today = GregorianCalendar.getInstance();
 435
 436             final int myYear = c.get(Calendar.YEAR);
 437             final int myMonth = c.get(Calendar.MONTH);
 438             final int myDay = c.get(Calendar.DAY_OF_MONTH);
 439
 440             if (today.get(Calendar.YEAR) != myYear) {
 441                 return String.format(Locale.US, "%d/%02d/%02d", myYear, myMonth + 1, myDay);
 442             }
 443
 444             if (today.get(Calendar.MONTH) != myMonth) {
 445                 return String.format(Locale.US, "%d/%02d", myMonth + 1, myDay);
 446             }
 447
 448             return String.valueOf(myDay);
 449         }
 450         void observeEditableFlag(NewTransactionActivity activity, Observer<Boolean> observer) {
 451             editable.observe(activity, observer);
 452         }
 453         void stopObservingEditableFlag(Observer<Boolean> observer) {
 454             editable.removeObserver(observer);
 455         }
 456         void observeComment(NewTransactionActivity activity, Observer<String> observer) {
 457             comment.observe(activity, observer);
 458         }
 459         void stopObservingComment(Observer<String> observer) {
 460             comment.removeObserver(observer);
 461         }
 462         public void setComment(String comment) {
 463             getAccount().setComment(comment);
 464             this.comment.postValue(comment);
 465         }
 466         public Currency getCurrency() {
 467             return this.currency.getValue();
 468         }
 469         public void setCurrency(Currency currency) {
 470             Currency present = this.currency.getValue();
 471             if ((currency == null) && (present != null) ||
 472                 (currency != null) && !currency.equals(present))
 473             {
 474                 getAccount().setCurrency((currency != null && !currency.getName()
 475                                                                        .isEmpty())
 476                                          ? currency.getName() : null);
 477                 this.currency.setValue(currency);
 478             }
 479         }
 480         void observeCurrency(NewTransactionActivity activity, Observer<Currency> observer) {
 481             currency.observe(activity, observer);
 482         }
 483         void stopObservingCurrency(Observer<Currency> observer) {
 484             currency.removeObserver(observer);
 485         }
 486         boolean isOfType(ItemType type) {
 487             return this.type == type;
 488         }
 489         boolean isAmountHintSet() {
 490             return amountHintIsSet;
 491         }
 492     }
 493 }