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