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