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 MutableLiveData<Boolean> amountValid = new MutableLiveData<>(true);
 245         private boolean amountHintIsSet = false;
 246         Item(NewTransactionModel model) {
 247             this.model = model;
 248             type = ItemType.bottomFiller;
 249             editable.setValue(false);
 250         }
 251         Item(NewTransactionModel model, Date date, String description) {
 252             this.model = model;
 253             this.type = ItemType.generalData;
 254             this.date.setValue(date);
 255             this.description.setValue(description);
 256             this.editable.setValue(true);
 257         }
 258         Item(NewTransactionModel model, LedgerTransactionAccount account) {
 259             this.model = model;
 260             this.type = ItemType.transactionRow;
 261             this.account = account;
 262             String currName = account.getCurrency();
 263             Currency curr = null;
 264             if ((currName != null) && !currName.isEmpty())
 265                 curr = Currency.loadByName(currName);
 266             this.currency.setValue(curr);
 267             this.editable.setValue(true);
 268         }
 269         FocusedElement getFocusedElement() {
 270             return focusedElement;
 271         }
 272         void setFocusedElement(FocusedElement focusedElement) {
 273             this.focusedElement = focusedElement;
 274         }
 275         public NewTransactionModel getModel() {
 276             return model;
 277         }
 278         void setEditable(boolean editable) {
 279             ensureType(ItemType.generalData, ItemType.transactionRow);
 280             this.editable.setValue(editable);
 281         }
 282         private void ensureType(ItemType type1, ItemType type2) {
 283             if ((type != type1) && (type != type2)) {
 284                 throw new RuntimeException(
 285                         String.format("Actual type (%s) differs from wanted (%s or %s)", type,
 286                                 type1, type2));
 287             }
 288         }
 289         String getAmountHint() {
 290             ensureType(ItemType.transactionRow);
 291             return amountHint.getValue();
 292         }
 293         void setAmountHint(String amountHint) {
 294             ensureType(ItemType.transactionRow);
 295
 296             // avoid unnecessary triggers
 297             if (amountHint == null) {
 298                 if (this.amountHint.getValue() == null)
 299                     return;
 300                 amountHintIsSet = false;
 301             }
 302             else {
 303                 if (amountHint.equals(this.amountHint.getValue()))
 304                     return;
 305                 amountHintIsSet = true;
 306             }
 307
 308             this.amountHint.setValue(amountHint);
 309         }
 310         void observeAmountHint(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 311                                @NonNull androidx.lifecycle.Observer<? super String> observer) {
 312             this.amountHint.observe(owner, observer);
 313         }
 314         void stopObservingAmountHint(
 315                 @NonNull androidx.lifecycle.Observer<? super String> observer) {
 316             this.amountHint.removeObserver(observer);
 317         }
 318         ItemType getType() {
 319             return type;
 320         }
 321         void ensureType(ItemType wantedType) {
 322             if (type != wantedType) {
 323                 throw new RuntimeException(
 324                         String.format("Actual type (%s) differs from wanted (%s)", type,
 325                                 wantedType));
 326             }
 327         }
 328         public Date getDate() {
 329             ensureType(ItemType.generalData);
 330             return date.getValue();
 331         }
 332         public void setDate(Date date) {
 333             ensureType(ItemType.generalData);
 334             this.date.setValue(date);
 335         }
 336         public void setDate(String text) {
 337             if ((text == null) || text.trim()
 338                                       .isEmpty())
 339             {
 340                 setDate((Date) null);
 341                 return;
 342             }
 343
 344             int year, month, day;
 345             final Calendar c = GregorianCalendar.getInstance();
 346             Matcher m = reYMD.matcher(text);
 347             if (m.matches()) {
 348                 year = Integer.parseInt(m.group(1));
 349                 month = Integer.parseInt(m.group(2)) - 1;   // month is 0-based
 350                 day = Integer.parseInt(m.group(3));
 351             }
 352             else {
 353                 year = c.get(Calendar.YEAR);
 354                 m = reMD.matcher(text);
 355                 if (m.matches()) {
 356                     month = Integer.parseInt(m.group(1)) - 1;
 357                     day = Integer.parseInt(m.group(2));
 358                 }
 359                 else {
 360                     month = c.get(Calendar.MONTH);
 361                     m = reD.matcher(text);
 362                     if (m.matches()) {
 363                         day = Integer.parseInt(m.group(1));
 364                     }
 365                     else {
 366                         day = c.get(Calendar.DAY_OF_MONTH);
 367                     }
 368                 }
 369             }
 370
 371             c.set(year, month, day);
 372
 373             this.setDate(c.getTime());
 374         }
 375         void observeDate(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 376                          @NonNull androidx.lifecycle.Observer<? super Date> observer) {
 377             this.date.observe(owner, observer);
 378         }
 379         void stopObservingDate(@NonNull androidx.lifecycle.Observer<? super Date> observer) {
 380             this.date.removeObserver(observer);
 381         }
 382         public String getDescription() {
 383             ensureType(ItemType.generalData);
 384             return description.getValue();
 385         }
 386         public void setDescription(String description) {
 387             ensureType(ItemType.generalData);
 388             this.description.setValue(description);
 389         }
 390         void observeDescription(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 391                                 @NonNull androidx.lifecycle.Observer<? super String> observer) {
 392             this.description.observe(owner, observer);
 393         }
 394         void stopObservingDescription(
 395                 @NonNull androidx.lifecycle.Observer<? super String> observer) {
 396             this.description.removeObserver(observer);
 397         }
 398         public String getTransactionComment() {
 399             ensureType(ItemType.generalData);
 400             return comment.getValue();
 401         }
 402         public void setTransactionComment(String transactionComment) {
 403             ensureType(ItemType.generalData);
 404             this.comment.setValue(transactionComment);
 405         }
 406         void observeTransactionComment(@NonNull @NotNull LifecycleOwner owner,
 407                                        @NonNull Observer<? super String> observer) {
 408             ensureType(ItemType.generalData);
 409             this.comment.observe(owner, observer);
 410         }
 411         void stopObservingTransactionComment(@NonNull Observer<? super String> observer) {
 412             this.comment.removeObserver(observer);
 413         }
 414         public LedgerTransactionAccount getAccount() {
 415             ensureType(ItemType.transactionRow);
 416             return account;
 417         }
 418         public void setAccountName(String name) {
 419             account.setAccountName(name);
 420         }
 421         /**
 422          * getFormattedDate()
 423          *
 424          * @return nicely formatted, shortest available date representation
 425          */
 426         String getFormattedDate() {
 427             if (date == null)
 428                 return null;
 429             Date time = date.getValue();
 430             if (time == null)
 431                 return null;
 432
 433             Calendar c = GregorianCalendar.getInstance();
 434             c.setTime(time);
 435             Calendar today = GregorianCalendar.getInstance();
 436
 437             final int myYear = c.get(Calendar.YEAR);
 438             final int myMonth = c.get(Calendar.MONTH);
 439             final int myDay = c.get(Calendar.DAY_OF_MONTH);
 440
 441             if (today.get(Calendar.YEAR) != myYear) {
 442                 return String.format(Locale.US, "%d/%02d/%02d", myYear, myMonth + 1, myDay);
 443             }
 444
 445             if (today.get(Calendar.MONTH) != myMonth) {
 446                 return String.format(Locale.US, "%d/%02d", myMonth + 1, myDay);
 447             }
 448
 449             return String.valueOf(myDay);
 450         }
 451         void observeEditableFlag(NewTransactionActivity activity, Observer<Boolean> observer) {
 452             editable.observe(activity, observer);
 453         }
 454         void stopObservingEditableFlag(Observer<Boolean> observer) {
 455             editable.removeObserver(observer);
 456         }
 457         void observeComment(NewTransactionActivity activity, Observer<String> observer) {
 458             comment.observe(activity, observer);
 459         }
 460         void stopObservingComment(Observer<String> observer) {
 461             comment.removeObserver(observer);
 462         }
 463         public void setComment(String comment) {
 464             getAccount().setComment(comment);
 465             this.comment.postValue(comment);
 466         }
 467         public Currency getCurrency() {
 468             return this.currency.getValue();
 469         }
 470         public void setCurrency(Currency currency) {
 471             Currency present = this.currency.getValue();
 472             if ((currency == null) && (present != null) ||
 473                 (currency != null) && !currency.equals(present))
 474             {
 475                 getAccount().setCurrency((currency != null && !currency.getName()
 476                                                                        .isEmpty())
 477                                          ? currency.getName() : null);
 478                 this.currency.setValue(currency);
 479             }
 480         }
 481         void observeCurrency(NewTransactionActivity activity, Observer<Currency> observer) {
 482             currency.observe(activity, observer);
 483         }
 484         void stopObservingCurrency(Observer<Currency> observer) {
 485             currency.removeObserver(observer);
 486         }
 487         boolean isOfType(ItemType type) {
 488             return this.type == type;
 489         }
 490         boolean isAmountHintSet() {
 491             return amountHintIsSet;
 492         }
 493         void validateAmount() {
 494             amountValid.setValue(true);
 495         }
 496         void invalidateAmount() {
 497             amountValid.setValue(false);
 498         }
 499         void observeAmountValidity(NewTransactionActivity activity, Observer<Boolean> observer) {
 500             amountValid.observe(activity, observer);
 501         }
 502         void stopObservingAmountValidity(Observer<Boolean> observer) {
 503             amountValid.removeObserver(observer);
 504         }
 505     }
 506 }