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 android.annotation.SuppressLint;
  21
  22 import androidx.annotation.NonNull;
  23 import androidx.lifecycle.LiveData;
  24 import androidx.lifecycle.MutableLiveData;
  25 import androidx.lifecycle.Observer;
  26 import androidx.lifecycle.ViewModel;
  27
  28 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  29 import net.ktnx.mobileledger.utils.Misc;
  30
  31 import org.jetbrains.annotations.NotNull;
  32
  33 import java.util.ArrayList;
  34 import java.util.Calendar;
  35 import java.util.Date;
  36 import java.util.GregorianCalendar;
  37 import java.util.Locale;
  38 import java.util.regex.Matcher;
  39 import java.util.regex.Pattern;
  40
  41 import static net.ktnx.mobileledger.utils.Logger.debug;
  42 import static net.ktnx.mobileledger.utils.Misc.isZero;
  43
  44 public class NewTransactionModel extends ViewModel {
  45     static final Pattern reYMD = Pattern.compile("^\\s*(\\d+)\\d*/\\s*(\\d+)\\s*/\\s*(\\d+)\\s*$");
  46     static final Pattern reMD = Pattern.compile("^\\s*(\\d+)\\s*/\\s*(\\d+)\\s*$");
  47     static final Pattern reD = Pattern.compile("\\s*(\\d+)\\s*$");
  48     private final Item header = new Item(this, null, "");
  49     private final Item trailer = new Item(this);
  50     private final ArrayList<Item> items = new ArrayList<>();
  51     private final MutableLiveData<Boolean> isSubmittable = new MutableLiveData<>(false);
  52     private final MutableLiveData<Integer> focusedItem = new MutableLiveData<>(null);
  53     private final MutableLiveData<Integer> accountCount = new MutableLiveData<>(0);
  54     public int getAccountCount() {
  55         return items.size();
  56     }
  57     public Date getDate() {
  58         return header.date.getValue();
  59     }
  60     public String getDescription() {
  61         return header.description.getValue();
  62     }
  63     public LiveData<Boolean> isSubmittable() {
  64         return this.isSubmittable;
  65     }
  66     void reset() {
  67         header.date.setValue(null);
  68         header.description.setValue(null);
  69         items.clear();
  70         items.add(new Item(this, new LedgerTransactionAccount("")));
  71         items.add(new Item(this, new LedgerTransactionAccount("")));
  72         focusedItem.setValue(0);
  73     }
  74     public void observeFocusedItem(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
  75                                    @NonNull androidx.lifecycle.Observer<? super Integer> observer) {
  76         this.focusedItem.observe(owner, observer);
  77     }
  78     public void stopObservingFocusedItem(
  79             @NonNull androidx.lifecycle.Observer<? super Integer> observer) {
  80         this.focusedItem.removeObserver(observer);
  81     }
  82     public void observeAccountCount(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
  83                                     @NonNull
  84                                             androidx.lifecycle.Observer<? super Integer> observer) {
  85         this.accountCount.observe(owner, observer);
  86     }
  87     public void stopObservingAccountCount(
  88             @NonNull androidx.lifecycle.Observer<? super Integer> observer) {
  89         this.accountCount.removeObserver(observer);
  90     }
  91     public void setFocusedItem(int position) {
  92         focusedItem.setValue(position);
  93     }
  94     public int addAccount(LedgerTransactionAccount acc) {
  95         items.add(new Item(this, acc));
  96         accountCount.setValue(getAccountCount());
  97         return items.size();
  98     }
  99     boolean accountsInInitialState() {
 100         for (Item item : items) {
 101             LedgerTransactionAccount acc = item.getAccount();
 102             if (acc.isAmountSet())
 103                 return false;
 104             if (!acc.getAccountName()
 105                     .trim()
 106                     .isEmpty())
 107                 return false;
 108         }
 109
 110         return true;
 111     }
 112     LedgerTransactionAccount getAccount(int index) {
 113         return items.get(index)
 114                     .getAccount();
 115     }
 116     public Item getItem(int index) {
 117         if (index == 0) {
 118             return header;
 119         }
 120
 121         if (index <= items.size())
 122             return items.get(index - 1);
 123
 124         return trailer;
 125     }
 126     // rules:
 127     // 1) at least two account names
 128     // 2) each amount must have account name
 129     // 3) amounts must balance to 0, or
 130     // 3a) there must be exactly one empty amount
 131     // 4) empty accounts with empty amounts are ignored
 132     // 5) a row with an empty account name or empty amount is guaranteed to exist
 133     @SuppressLint("DefaultLocale")
 134     public void checkTransactionSubmittable(NewTransactionItemsAdapter adapter) {
 135         int accounts = 0;
 136         int accounts_with_values = 0;
 137         int amounts = 0;
 138         int amounts_with_accounts = 0;
 139         int empty_rows = 0;
 140         Item empty_amount = null;
 141         boolean single_empty_amount = false;
 142         boolean single_empty_amount_has_account = false;
 143         float running_total = 0f;
 144         final String descriptionText = getDescription();
 145         final boolean have_description = ((descriptionText != null) && !descriptionText.isEmpty());
 146
 147         try {
 148             for (int i = 0; i < this.items.size(); i++) {
 149                 Item item = this.items.get(i);
 150
 151                 LedgerTransactionAccount acc = item.getAccount();
 152                 String acc_name = acc.getAccountName()
 153                                      .trim();
 154                 if (acc_name.isEmpty()) {
 155                     empty_rows++;
 156                 }
 157                 else {
 158                     accounts++;
 159
 160                     if (acc.isAmountSet()) {
 161                         accounts_with_values++;
 162                     }
 163                 }
 164
 165                 if (acc.isAmountSet()) {
 166                     amounts++;
 167                     if (!acc_name.isEmpty())
 168                         amounts_with_accounts++;
 169                     running_total += acc.getAmount();
 170                 }
 171                 else {
 172                     if (empty_amount == null) {
 173                         empty_amount = item;
 174                         single_empty_amount = true;
 175                         single_empty_amount_has_account = !acc_name.isEmpty();
 176                     }
 177                     else if (!acc_name.isEmpty())
 178                         single_empty_amount = false;
 179                 }
 180             }
 181
 182             if ((empty_rows == 0) &&
 183                 ((this.items.size() == accounts) || (this.items.size() == amounts)))
 184             {
 185                 adapter.addRow();
 186             }
 187
 188             for (NewTransactionModel.Item item : items) {
 189
 190                 final LedgerTransactionAccount acc = item.getAccount();
 191                 if (acc.isAmountSet())
 192                     continue;
 193
 194                 if (single_empty_amount) {
 195                     if (item.equals(empty_amount)) {
 196                         empty_amount.setAmountHint(Misc.isZero(running_total) ? null
 197                                                                               : String.format(
 198                                                                                       "%1.2f",
 199                                                                                       -running_total));
 200                         continue;
 201                     }
 202                 }
 203                 else {
 204                     // no single empty account and this account's amount is not set
 205                     // => hint should be '0.00'
 206                     item.setAmountHint(null);
 207                 }
 208
 209             }
 210
 211             debug("submittable", String.format(Locale.US,
 212                     "%s, accounts=%d, accounts_with_values=%s, " +
 213                     "amounts_with_accounts=%d, amounts=%d, running_total=%1.2f, " +
 214                     "single_empty_with_acc=%s", have_description ? "description" : "NO description",
 215                     accounts, accounts_with_values, amounts_with_accounts, amounts, running_total,
 216                     (single_empty_amount && single_empty_amount_has_account) ? "true" : "false"));
 217
 218             if (have_description && (accounts >= 2) && (accounts_with_values >= (accounts - 1)) &&
 219                 (amounts_with_accounts == amounts) &&
 220                 (single_empty_amount && single_empty_amount_has_account || isZero(running_total)))
 221             {
 222                 debug("submittable", "YES");
 223                 isSubmittable.setValue(true);
 224             }
 225             else {
 226                 debug("submittable", "NO");
 227                 isSubmittable.setValue(false);
 228             }
 229
 230         }
 231         catch (NumberFormatException e) {
 232             debug("submittable", "NO (because of NumberFormatException)");
 233             isSubmittable.setValue(false);
 234         }
 235         catch (Exception e) {
 236             e.printStackTrace();
 237             debug("submittable", "NO (because of an Exception)");
 238             isSubmittable.setValue(false);
 239         }
 240     }
 241     public void removeItem(int pos) {
 242         items.remove(pos);
 243         accountCount.setValue(getAccountCount());
 244     }
 245     public void sendCountNotifications() {
 246         accountCount.setValue(getAccountCount());
 247     }
 248     enum ItemType {generalData, transactionRow, bottomFiller}
 249
 250     class Item extends Object {
 251         private ItemType type;
 252         private MutableLiveData<Date> date = new MutableLiveData<>();
 253         private MutableLiveData<String> description = new MutableLiveData<>();
 254         private LedgerTransactionAccount account;
 255         private MutableLiveData<String> amountHint = new MutableLiveData<>(null);
 256         private NewTransactionModel model;
 257         private MutableLiveData<Boolean> editable = new MutableLiveData<>(true);
 258         public Item(NewTransactionModel model) {
 259             this.model = model;
 260             type = ItemType.bottomFiller;
 261             editable.setValue(false);
 262         }
 263         public Item(NewTransactionModel model, Date date, String description) {
 264             this.model = model;
 265             this.type = ItemType.generalData;
 266             this.date.setValue(date);
 267             this.description.setValue(description);
 268             this.editable.setValue(true);
 269         }
 270         public Item(NewTransactionModel model, LedgerTransactionAccount account) {
 271             this.model = model;
 272             this.type = ItemType.transactionRow;
 273             this.account = account;
 274             this.editable.setValue(true);
 275         }
 276         public NewTransactionModel getModel() {
 277             return model;
 278         }
 279         public boolean isEditable() {
 280             ensureType(ItemType.transactionRow);
 281             return this.editable.getValue();
 282         }
 283         public void setEditable(boolean editable) {
 284             ensureType(ItemType.transactionRow);
 285             this.editable.setValue(editable);
 286         }
 287         public String getAmountHint() {
 288             ensureType(ItemType.transactionRow);
 289             return amountHint.getValue();
 290         }
 291         public void setAmountHint(String amountHint) {
 292             ensureType(ItemType.transactionRow);
 293
 294             // avoid unnecessary triggers
 295             if (amountHint == null) {
 296                 if (this.amountHint.getValue() == null)
 297                     return;
 298             }
 299             else {
 300                 if (amountHint.equals(this.amountHint.getValue()))
 301                     return;
 302             }
 303
 304             this.amountHint.setValue(amountHint);
 305         }
 306         public void observeAmountHint(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 307                                       @NonNull
 308                                               androidx.lifecycle.Observer<? super String> observer) {
 309             this.amountHint.observe(owner, observer);
 310         }
 311         public void stopObservingAmountHint(
 312                 @NonNull androidx.lifecycle.Observer<? super String> observer) {
 313             this.amountHint.removeObserver(observer);
 314         }
 315         public ItemType getType() {
 316             return type;
 317         }
 318         public void ensureType(ItemType wantedType) {
 319             if (type != wantedType) {
 320                 throw new RuntimeException(
 321                         String.format("Actual type (%s) differs from wanted (%s)", type,
 322                                 wantedType));
 323             }
 324         }
 325         public Date getDate() {
 326             ensureType(ItemType.generalData);
 327             return date.getValue();
 328         }
 329         public void setDate(Date date) {
 330             ensureType(ItemType.generalData);
 331             this.date.setValue(date);
 332         }
 333         public void setDate(String text) {
 334             int year, month, day;
 335             final Calendar c = GregorianCalendar.getInstance();
 336             Matcher m = reYMD.matcher(text);
 337             if (m.matches()) {
 338                 year = Integer.parseInt(m.group(1));
 339                 month = Integer.parseInt(m.group(2)) - 1;   // month is 0-based
 340                 day = Integer.parseInt(m.group(3));
 341             }
 342             else {
 343                 year = c.get(Calendar.YEAR);
 344                 m = reMD.matcher(text);
 345                 if (m.matches()) {
 346                     month = Integer.parseInt(m.group(1)) - 1;
 347                     day = Integer.parseInt(m.group(2));
 348                 }
 349                 else {
 350                     month = c.get(Calendar.MONTH);
 351                     m = reD.matcher(text);
 352                     if (m.matches()) {
 353                         day = Integer.parseInt(m.group(1));
 354                     }
 355                     else {
 356                         day = c.get(Calendar.DAY_OF_MONTH);
 357                     }
 358                 }
 359             }
 360
 361             c.set(year, month, day);
 362
 363             this.setDate(c.getTime());
 364         }
 365         public void observeDate(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 366                                 @NonNull androidx.lifecycle.Observer<? super Date> observer) {
 367             this.date.observe(owner, observer);
 368         }
 369         public void stopObservingDate(@NonNull androidx.lifecycle.Observer<? super Date> observer) {
 370             this.date.removeObserver(observer);
 371         }
 372         public String getDescription() {
 373             ensureType(ItemType.generalData);
 374             return description.getValue();
 375         }
 376         public void setDescription(String description) {
 377             ensureType(ItemType.generalData);
 378             this.description.setValue(description);
 379         }
 380         public void observeDescription(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 381                                        @NonNull
 382                                                androidx.lifecycle.Observer<? super String> observer) {
 383             this.description.observe(owner, observer);
 384         }
 385         public 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         public 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, myDay);
 418             }
 419
 420             if (today.get(Calendar.MONTH) != myMonth) {
 421                 return String.format(Locale.US, "%d/%02d", myMonth, myDay);
 422             }
 423
 424             return String.valueOf(myDay);
 425         }
 426         public void observeEditableFlag(NewTransactionActivity activity,
 427                                         Observer<Boolean> observer) {
 428             editable.observe(activity, observer);
 429         }
 430         public void stopObservingEditableFlag(Observer<Boolean> observer) {
 431             editable.removeObserver(observer);
 432         }
 433     }
 434 }