app/src/main/java/net/ktnx/mobileledger/ui/activity/NewTransactionModel.java

   1 /*
   2  * Copyright © 2020 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 import net.ktnx.mobileledger.utils.Globals;
  32 import net.ktnx.mobileledger.utils.SimpleDate;
  33
  34 import org.jetbrains.annotations.NotNull;
  35
  36 import java.text.ParseException;
  37 import java.util.ArrayList;
  38 import java.util.Calendar;
  39 import java.util.Collections;
  40 import java.util.GregorianCalendar;
  41 import java.util.Locale;
  42 import java.util.concurrent.atomic.AtomicInteger;
  43
  44 public class NewTransactionModel extends ViewModel {
  45     final MutableLiveData<Boolean> showCurrency = new MutableLiveData<>(false);
  46     final ArrayList<Item> items = new ArrayList<>();
  47     final MutableLiveData<Boolean> isSubmittable = new MutableLiveData<>(false);
  48     final MutableLiveData<Boolean> showComments = new MutableLiveData<>(true);
  49     private final Item header = new Item(this, null, "");
  50     private final Item trailer = new Item(this);
  51     private final MutableLiveData<Integer> focusedItem = new MutableLiveData<>(0);
  52     private final MutableLiveData<Integer> accountCount = new MutableLiveData<>(0);
  53     private final MutableLiveData<Boolean> simulateSave = new MutableLiveData<>(false);
  54     private final AtomicInteger busyCounter = new AtomicInteger(0);
  55     private final MutableLiveData<Boolean> busyFlag = new MutableLiveData<>(false);
  56     private boolean observingDataProfile;
  57     private Observer<MobileLedgerProfile> profileObserver = profile -> {
  58         showCurrency.postValue(profile.getShowCommodityByDefault());
  59         showComments.postValue(profile.getShowCommentsByDefault());
  60     };
  61     void observeShowComments(LifecycleOwner owner, Observer<? super Boolean> observer) {
  62         showComments.observe(owner, observer);
  63     }
  64     void observeBusyFlag(@NonNull LifecycleOwner owner, Observer<? super Boolean> observer) {
  65         busyFlag.observe(owner, observer);
  66     }
  67     void observeDataProfile(LifecycleOwner activity) {
  68         if (!observingDataProfile)
  69             Data.observeProfile(activity, profileObserver);
  70         observingDataProfile = true;
  71     }
  72     boolean getSimulateSave() {
  73         return simulateSave.getValue();
  74     }
  75     public void setSimulateSave(boolean simulateSave) {
  76         this.simulateSave.setValue(simulateSave);
  77     }
  78     void toggleSimulateSave() {
  79         simulateSave.setValue(!simulateSave.getValue());
  80     }
  81     void observeSimulateSave(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
  82                              @NonNull androidx.lifecycle.Observer<? super Boolean> observer) {
  83         this.simulateSave.observe(owner, observer);
  84     }
  85     int getAccountCount() {
  86         return items.size();
  87     }
  88     public SimpleDate getDate() {
  89         return header.date.getValue();
  90     }
  91     public String getDescription() {
  92         return header.description.getValue();
  93     }
  94     public String getComment() {
  95         return header.comment.getValue();
  96     }
  97     LiveData<Boolean> isSubmittable() {
  98         return this.isSubmittable;
  99     }
 100     void reset() {
 101         header.date.setValue(null);
 102         header.description.setValue(null);
 103         header.comment.setValue(null);
 104         items.clear();
 105         items.add(new Item(this, new LedgerTransactionAccount("")));
 106         items.add(new Item(this, new LedgerTransactionAccount("")));
 107         focusedItem.setValue(0);
 108     }
 109     void observeFocusedItem(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 110                             @NonNull androidx.lifecycle.Observer<? super Integer> observer) {
 111         this.focusedItem.observe(owner, observer);
 112     }
 113     void stopObservingFocusedItem(@NonNull androidx.lifecycle.Observer<? super Integer> observer) {
 114         this.focusedItem.removeObserver(observer);
 115     }
 116     void observeAccountCount(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 117                              @NonNull androidx.lifecycle.Observer<? super Integer> observer) {
 118         this.accountCount.observe(owner, observer);
 119     }
 120     void stopObservingAccountCount(@NonNull androidx.lifecycle.Observer<? super Integer> observer) {
 121         this.accountCount.removeObserver(observer);
 122     }
 123     int getFocusedItem() { return focusedItem.getValue(); }
 124     void setFocusedItem(int position) {
 125         focusedItem.setValue(position);
 126     }
 127     int addAccount(LedgerTransactionAccount acc) {
 128         items.add(new Item(this, acc));
 129         accountCount.setValue(getAccountCount());
 130         return items.size();
 131     }
 132     boolean accountsInInitialState() {
 133         for (Item item : items) {
 134             LedgerTransactionAccount acc = item.getAccount();
 135             if (acc.isAmountSet())
 136                 return false;
 137             if (!acc.getAccountName()
 138                     .trim()
 139                     .isEmpty())
 140                 return false;
 141         }
 142
 143         return true;
 144     }
 145     LedgerTransactionAccount getAccount(int index) {
 146         return items.get(index)
 147                     .getAccount();
 148     }
 149     Item getItem(int index) {
 150         if (index == 0) {
 151             return header;
 152         }
 153
 154         if (index <= items.size())
 155             return items.get(index - 1);
 156
 157         return trailer;
 158     }
 159     void removeRow(Item item, NewTransactionItemsAdapter adapter) {
 160         int pos = items.indexOf(item);
 161         items.remove(pos);
 162         if (adapter != null) {
 163             adapter.notifyItemRemoved(pos + 1);
 164             sendCountNotifications();
 165         }
 166     }
 167     void removeItem(int pos) {
 168         items.remove(pos);
 169         accountCount.setValue(getAccountCount());
 170     }
 171     void sendCountNotifications() {
 172         accountCount.setValue(getAccountCount());
 173     }
 174     public void sendFocusedNotification() {
 175         focusedItem.setValue(focusedItem.getValue());
 176     }
 177     void updateFocusedItem(int position) {
 178         focusedItem.setValue(position);
 179     }
 180     void noteFocusChanged(int position, FocusedElement element) {
 181         getItem(position).setFocusedElement(element);
 182     }
 183     void swapItems(int one, int two) {
 184         Collections.swap(items, one - 1, two - 1);
 185     }
 186     void moveItemLast(int index) {
 187         /*   0
 188              1   <-- index
 189              2
 190              3   <-- desired position
 191          */
 192         int itemCount = items.size();
 193
 194         if (index < itemCount - 1) {
 195             Item acc = items.remove(index);
 196             items.add(itemCount - 1, acc);
 197         }
 198     }
 199     void toggleCurrencyVisible() {
 200         showCurrency.setValue(!showCurrency.getValue());
 201     }
 202     void stopObservingBusyFlag(Observer<Boolean> observer) {
 203         busyFlag.removeObserver(observer);
 204     }
 205     void incrementBusyCounter() {
 206         int newValue = busyCounter.incrementAndGet();
 207         if (newValue == 1)
 208             busyFlag.postValue(true);
 209     }
 210     void decrementBusyCounter() {
 211         int newValue = busyCounter.decrementAndGet();
 212         if (newValue == 0)
 213             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<SimpleDate> 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 MutableLiveData<Boolean> amountValid = new MutableLiveData<>(true);
 241         private boolean amountHintIsSet = false;
 242         Item(NewTransactionModel model) {
 243             this.model = model;
 244             type = ItemType.bottomFiller;
 245             editable.setValue(false);
 246         }
 247         Item(NewTransactionModel model, SimpleDate date, String description) {
 248             this.model = model;
 249             this.type = ItemType.generalData;
 250             this.date.setValue(date);
 251             this.description.setValue(description);
 252             this.editable.setValue(true);
 253         }
 254         Item(NewTransactionModel model, LedgerTransactionAccount account) {
 255             this.model = model;
 256             this.type = ItemType.transactionRow;
 257             this.account = account;
 258             String currName = account.getCurrency();
 259             Currency curr = null;
 260             if ((currName != null) && !currName.isEmpty())
 261                 curr = Currency.loadByName(currName);
 262             this.currency.setValue(curr);
 263             this.editable.setValue(true);
 264         }
 265         FocusedElement getFocusedElement() {
 266             return focusedElement;
 267         }
 268         void setFocusedElement(FocusedElement focusedElement) {
 269             this.focusedElement = focusedElement;
 270         }
 271         public NewTransactionModel getModel() {
 272             return model;
 273         }
 274         void setEditable(boolean editable) {
 275             ensureType(ItemType.generalData, ItemType.transactionRow);
 276             this.editable.setValue(editable);
 277         }
 278         private void ensureType(ItemType type1, ItemType type2) {
 279             if ((type != type1) && (type != type2)) {
 280                 throw new RuntimeException(
 281                         String.format("Actual type (%s) differs from wanted (%s or %s)", type,
 282                                 type1, type2));
 283             }
 284         }
 285         String getAmountHint() {
 286             ensureType(ItemType.transactionRow);
 287             return amountHint.getValue();
 288         }
 289         void setAmountHint(String amountHint) {
 290             ensureType(ItemType.transactionRow);
 291
 292             // avoid unnecessary triggers
 293             if (amountHint == null) {
 294                 if (this.amountHint.getValue() == null)
 295                     return;
 296                 amountHintIsSet = false;
 297             }
 298             else {
 299                 if (amountHint.equals(this.amountHint.getValue()))
 300                     return;
 301                 amountHintIsSet = true;
 302             }
 303
 304             this.amountHint.setValue(amountHint);
 305         }
 306         void observeAmountHint(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 307                                @NonNull androidx.lifecycle.Observer<? super String> observer) {
 308             this.amountHint.observe(owner, observer);
 309         }
 310         void stopObservingAmountHint(
 311                 @NonNull androidx.lifecycle.Observer<? super String> observer) {
 312             this.amountHint.removeObserver(observer);
 313         }
 314         ItemType getType() {
 315             return type;
 316         }
 317         void ensureType(ItemType wantedType) {
 318             if (type != wantedType) {
 319                 throw new RuntimeException(
 320                         String.format("Actual type (%s) differs from wanted (%s)", type,
 321                                 wantedType));
 322             }
 323         }
 324         public SimpleDate getDate() {
 325             ensureType(ItemType.generalData);
 326             return date.getValue();
 327         }
 328         public void setDate(SimpleDate date) {
 329             ensureType(ItemType.generalData);
 330             this.date.setValue(date);
 331         }
 332         public void setDate(String text) throws ParseException {
 333             if ((text == null) || text.trim()
 334                                       .isEmpty())
 335             {
 336                 setDate((SimpleDate) null);
 337                 return;
 338             }
 339
 340             SimpleDate date = Globals.parseLedgerDate(text);
 341             this.setDate(date);
 342         }
 343         void observeDate(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 344                          @NonNull androidx.lifecycle.Observer<? super SimpleDate> observer) {
 345             this.date.observe(owner, observer);
 346         }
 347         void stopObservingDate(@NonNull androidx.lifecycle.Observer<? super SimpleDate> observer) {
 348             this.date.removeObserver(observer);
 349         }
 350         public String getDescription() {
 351             ensureType(ItemType.generalData);
 352             return description.getValue();
 353         }
 354         public void setDescription(String description) {
 355             ensureType(ItemType.generalData);
 356             this.description.setValue(description);
 357         }
 358         void observeDescription(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 359                                 @NonNull androidx.lifecycle.Observer<? super String> observer) {
 360             this.description.observe(owner, observer);
 361         }
 362         void stopObservingDescription(
 363                 @NonNull androidx.lifecycle.Observer<? super String> observer) {
 364             this.description.removeObserver(observer);
 365         }
 366         public String getTransactionComment() {
 367             ensureType(ItemType.generalData);
 368             return comment.getValue();
 369         }
 370         public void setTransactionComment(String transactionComment) {
 371             ensureType(ItemType.generalData);
 372             this.comment.setValue(transactionComment);
 373         }
 374         void observeTransactionComment(@NonNull @NotNull LifecycleOwner owner,
 375                                        @NonNull Observer<? super String> observer) {
 376             ensureType(ItemType.generalData);
 377             this.comment.observe(owner, observer);
 378         }
 379         void stopObservingTransactionComment(@NonNull Observer<? super String> observer) {
 380             this.comment.removeObserver(observer);
 381         }
 382         public LedgerTransactionAccount getAccount() {
 383             ensureType(ItemType.transactionRow);
 384             return account;
 385         }
 386         public void setAccountName(String name) {
 387             account.setAccountName(name);
 388         }
 389         /**
 390          * getFormattedDate()
 391          *
 392          * @return nicely formatted, shortest available date representation
 393          */
 394         String getFormattedDate() {
 395             if (date == null)
 396                 return null;
 397             SimpleDate d = date.getValue();
 398             if (d == null)
 399                 return null;
 400
 401             Calendar today = GregorianCalendar.getInstance();
 402
 403             if (today.get(Calendar.YEAR) != d.year) {
 404                 return String.format(Locale.US, "%d/%02d/%02d", d.year, d.month, d.day);
 405             }
 406
 407             if (today.get(Calendar.MONTH) != d.month - 1) {
 408                 return String.format(Locale.US, "%d/%02d", d.month, d.day);
 409             }
 410
 411             return String.valueOf(d.day);
 412         }
 413         void observeEditableFlag(NewTransactionActivity activity, Observer<Boolean> observer) {
 414             editable.observe(activity, observer);
 415         }
 416         void stopObservingEditableFlag(Observer<Boolean> observer) {
 417             editable.removeObserver(observer);
 418         }
 419         void observeComment(NewTransactionActivity activity, Observer<String> observer) {
 420             comment.observe(activity, observer);
 421         }
 422         void stopObservingComment(Observer<String> observer) {
 423             comment.removeObserver(observer);
 424         }
 425         public void setComment(String comment) {
 426             getAccount().setComment(comment);
 427             this.comment.postValue(comment);
 428         }
 429         public Currency getCurrency() {
 430             return this.currency.getValue();
 431         }
 432         public void setCurrency(Currency currency) {
 433             Currency present = this.currency.getValue();
 434             if ((currency == null) && (present != null) ||
 435                 (currency != null) && !currency.equals(present))
 436             {
 437                 getAccount().setCurrency((currency != null && !currency.getName()
 438                                                                        .isEmpty())
 439                                          ? currency.getName() : null);
 440                 this.currency.setValue(currency);
 441             }
 442         }
 443         void observeCurrency(NewTransactionActivity activity, Observer<Currency> observer) {
 444             currency.observe(activity, observer);
 445         }
 446         void stopObservingCurrency(Observer<Currency> observer) {
 447             currency.removeObserver(observer);
 448         }
 449         boolean isOfType(ItemType type) {
 450             return this.type == type;
 451         }
 452         boolean isAmountHintSet() {
 453             return amountHintIsSet;
 454         }
 455         void validateAmount() {
 456             amountValid.setValue(true);
 457         }
 458         void invalidateAmount() {
 459             amountValid.setValue(false);
 460         }
 461         void observeAmountValidity(NewTransactionActivity activity, Observer<Boolean> observer) {
 462             amountValid.observe(activity, observer);
 463         }
 464         void stopObservingAmountValidity(Observer<Boolean> observer) {
 465             amountValid.removeObserver(observer);
 466         }
 467     }
 468 }