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.LiveData;
  22 import androidx.lifecycle.MutableLiveData;
  23 import androidx.lifecycle.Observer;
  24 import androidx.lifecycle.ViewModel;
  25
  26 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  27 import net.ktnx.mobileledger.utils.Misc;
  28
  29 import org.jetbrains.annotations.NotNull;
  30
  31 import java.util.ArrayList;
  32 import java.util.Calendar;
  33 import java.util.Date;
  34 import java.util.GregorianCalendar;
  35 import java.util.Locale;
  36 import java.util.regex.Matcher;
  37 import java.util.regex.Pattern;
  38
  39 import static net.ktnx.mobileledger.utils.Logger.debug;
  40 import static net.ktnx.mobileledger.utils.Misc.isZero;
  41
  42 public class NewTransactionModel extends ViewModel {
  43     static final Pattern reYMD = Pattern.compile("^\\s*(\\d+)\\d*/\\s*(\\d+)\\s*/\\s*(\\d+)\\s*$");
  44     static final Pattern reMD = Pattern.compile("^\\s*(\\d+)\\s*/\\s*(\\d+)\\s*$");
  45     static final Pattern reD = Pattern.compile("\\s*(\\d+)\\s*$");
  46     private static final String ZERO_AMOUNT_HINT = "0.00";
  47     private final Item header = new Item(this, null, "");
  48     private final Item trailer = new Item(this);
  49     private final ArrayList<Item> items = new ArrayList<>();
  50     private final MutableLiveData<Boolean> isSubmittable = new MutableLiveData<>(false);
  51     private final MutableLiveData<Integer> focusedItem = new MutableLiveData<>(null);
  52     private final MutableLiveData<Integer> accountCount = new MutableLiveData<>(0);
  53     public int getAccountCount() {
  54         return items.size();
  55     }
  56     public Date getDate() {
  57         return header.date.getValue();
  58     }
  59     public String getDescription() {
  60         return header.description.getValue();
  61     }
  62     public LiveData<Boolean> isSubmittable() {
  63         return this.isSubmittable;
  64     }
  65     void reset() {
  66         header.date.setValue(null);
  67         header.description.setValue(null);
  68         items.clear();
  69         items.add(new Item(this, new LedgerTransactionAccount("")));
  70         items.add(new Item(this, new LedgerTransactionAccount("")));
  71         focusedItem.setValue(0);
  72     }
  73     public void observeFocusedItem(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
  74                                    @NonNull androidx.lifecycle.Observer<? super Integer> observer) {
  75         this.focusedItem.observe(owner, observer);
  76     }
  77     public void stopObservingFocusedItem(
  78             @NonNull androidx.lifecycle.Observer<? super Integer> observer) {
  79         this.focusedItem.removeObserver(observer);
  80     }
  81     public void observeAccountCount(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
  82                                     @NonNull
  83                                             androidx.lifecycle.Observer<? super Integer> observer) {
  84         this.accountCount.observe(owner, observer);
  85     }
  86     public void stopObservingAccountCount(
  87             @NonNull androidx.lifecycle.Observer<? super Integer> observer) {
  88         this.accountCount.removeObserver(observer);
  89     }
  90     public void setFocusedItem(int position) {
  91         focusedItem.setValue(position);
  92     }
  93     public int addAccount(LedgerTransactionAccount acc) {
  94         items.add(new Item(this, acc));
  95         accountCount.setValue(getAccountCount());
  96         return items.size();
  97     }
  98     boolean accountsInInitialState() {
  99         for (Item item : items) {
 100             LedgerTransactionAccount acc = item.getAccount();
 101             if (acc.isAmountSet()) return false;
 102             if (!acc.getAccountName()
 103                     .trim()
 104                     .isEmpty()) return false;
 105         }
 106
 107         return true;
 108     }
 109     LedgerTransactionAccount getAccount(int index) {
 110         return items.get(index)
 111                     .getAccount();
 112     }
 113     public Item getItem(int index) {
 114         if (index == 0) {
 115             return header;
 116         }
 117
 118         if (index <= items.size()) return items.get(index - 1);
 119
 120         return trailer;
 121     }
 122     // rules:
 123     // 1) at least two account names
 124     // 2) each amount must have account name
 125     // 3) amounts must balance to 0, or
 126     // 3a) there must be exactly one empty amount
 127     // 4) empty accounts with empty amounts are ignored
 128     // 5) a row with an empty account name or empty amount is guaranteed to exist
 129     public void checkTransactionSubmittable(NewTransactionItemsAdapter adapter) {
 130         int accounts = 0;
 131         int accounts_with_values = 0;
 132         int amounts = 0;
 133         int amounts_with_accounts = 0;
 134         int empty_rows = 0;
 135         Item empty_amount = null;
 136         boolean single_empty_amount = false;
 137         boolean single_empty_amount_has_account = false;
 138         float running_total = 0f;
 139         final String descriptionText = getDescription();
 140         final boolean have_description = ((descriptionText != null) && !descriptionText.isEmpty());
 141
 142         try {
 143             for (int i = 0; i < this.items.size(); i++) {
 144                 Item item = this.items.get(i);
 145
 146                 LedgerTransactionAccount acc = item.getAccount();
 147                 String acc_name = acc.getAccountName()
 148                                      .trim();
 149                 if (acc_name.isEmpty()) {
 150                     empty_rows++;
 151                 }
 152                 else {
 153                     accounts++;
 154
 155                     if (acc.isAmountSet()) {
 156                         accounts_with_values++;
 157                     }
 158                 }
 159
 160                 if (acc.isAmountSet()) {
 161                     amounts++;
 162                     if (!acc_name.isEmpty())
 163                         amounts_with_accounts++;
 164                     running_total += acc.getAmount();
 165                 }
 166                 else {
 167                     if (empty_amount == null) {
 168                         empty_amount = item;
 169                         single_empty_amount = true;
 170                         single_empty_amount_has_account = !acc_name.isEmpty();
 171                     }
 172                     else if (!acc_name.isEmpty())
 173                         single_empty_amount = false;
 174                 }
 175             }
 176
 177             if ((empty_rows == 0) &&
 178                 ((this.items.size() == accounts) || (this.items.size() == amounts)))
 179             {
 180                 adapter.addRow();
 181             }
 182
 183             for (NewTransactionModel.Item item : items) {
 184
 185                 final LedgerTransactionAccount acc = item.getAccount();
 186                 if (acc.isAmountSet())
 187                     continue;
 188
 189                 if (single_empty_amount) {
 190                     if (item.equals(empty_amount)) {
 191                         empty_amount.setAmountHint(String.format(Locale.US, "%1.2f",
 192                                 Misc.isZero(running_total) ? 0f : -running_total));
 193                         continue;
 194                     }
 195                 }
 196                 else {
 197                     // no single empty account and this account's amount is not set
 198                     // => hint should be '0.00'
 199                     String hint = item.getAmountHint();
 200                     if ((hint == null) || !hint.equals(ZERO_AMOUNT_HINT)) {
 201                         item.setAmountHint(ZERO_AMOUNT_HINT);
 202                     }
 203                 }
 204
 205             }
 206
 207             debug("submittable", String.format(Locale.US,
 208                     "%s, accounts=%d, accounts_with_values=%s, " +
 209                     "amounts_with_accounts=%d, amounts=%d, running_total=%1.2f, " +
 210                     "single_empty_with_acc=%s", have_description ? "description" : "NO description",
 211                     accounts, accounts_with_values, amounts_with_accounts, amounts, running_total,
 212                     (single_empty_amount && single_empty_amount_has_account) ? "true" : "false"));
 213
 214             if (have_description && (accounts >= 2) && (accounts_with_values >= (accounts - 1)) &&
 215                 (amounts_with_accounts == amounts) &&
 216                 (single_empty_amount && single_empty_amount_has_account || isZero(running_total)))
 217             {
 218                 debug("submittable", "YES");
 219                 isSubmittable.setValue(true);
 220             }
 221             else {
 222                 debug("submittable", "NO");
 223                 isSubmittable.setValue(false);
 224             }
 225
 226         }
 227         catch (NumberFormatException e) {
 228             debug("submittable", "NO (because of NumberFormatException)");
 229             isSubmittable.setValue(false);
 230         }
 231         catch (Exception e) {
 232             e.printStackTrace();
 233             debug("submittable", "NO (because of an Exception)");
 234             isSubmittable.setValue(false);
 235         }
 236     }
 237     public void removeItem(int pos) {
 238         items.remove(pos);
 239         accountCount.setValue(getAccountCount());
 240     }
 241     public void sendCountNotifications() {
 242         accountCount.setValue(getAccountCount());
 243     }
 244     enum ItemType {generalData, transactionRow, bottomFiller}
 245
 246     class Item extends Object {
 247         private ItemType type;
 248         private MutableLiveData<Date> date = new MutableLiveData<>();
 249         private MutableLiveData<String> description = new MutableLiveData<>();
 250         private LedgerTransactionAccount account;
 251         private MutableLiveData<String> amountHint = new MutableLiveData<>();
 252         private NewTransactionModel model;
 253         private MutableLiveData<Boolean> editable = new MutableLiveData<>(true);
 254         public Item(NewTransactionModel model) {
 255             this.model = model;
 256             type = ItemType.bottomFiller;
 257             editable.setValue(false);
 258         }
 259         public Item(NewTransactionModel model, Date date, String description) {
 260             this.model = model;
 261             this.type = ItemType.generalData;
 262             this.date.setValue(date);
 263             this.description.setValue(description);
 264             this.editable.setValue(true);
 265         }
 266         public Item(NewTransactionModel model, LedgerTransactionAccount account) {
 267             this.model = model;
 268             this.type = ItemType.transactionRow;
 269             this.account = account;
 270             this.editable.setValue(true);
 271         }
 272         public NewTransactionModel getModel() {
 273             return model;
 274         }
 275         public boolean isEditable() {
 276             ensureType(ItemType.transactionRow);
 277             return this.editable.getValue();
 278         }
 279         public void setEditable(boolean editable) {
 280             ensureType(ItemType.transactionRow);
 281             this.editable.setValue(editable);
 282         }
 283         public String getAmountHint() {
 284             ensureType(ItemType.transactionRow);
 285             return amountHint.getValue();
 286         }
 287         public void setAmountHint(String amountHint) {
 288             ensureType(ItemType.transactionRow);
 289             this.amountHint.setValue(amountHint);
 290         }
 291         public void observeAmountHint(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 292                                       @NonNull
 293                                               androidx.lifecycle.Observer<? super String> observer) {
 294             this.amountHint.observe(owner, observer);
 295         }
 296         public void stopObservingAmountHint(
 297                 @NonNull androidx.lifecycle.Observer<? super String> observer) {
 298             this.amountHint.removeObserver(observer);
 299         }
 300         public ItemType getType() {
 301             return type;
 302         }
 303         public void ensureType(ItemType wantedType) {
 304             if (type != wantedType) {
 305                 throw new RuntimeException(
 306                         String.format("Actual type (%s) differs from wanted (%s)", type,
 307                                 wantedType));
 308             }
 309         }
 310         public Date getDate() {
 311             ensureType(ItemType.generalData);
 312             return date.getValue();
 313         }
 314         public void setDate(Date date) {
 315             ensureType(ItemType.generalData);
 316             this.date.setValue(date);
 317         }
 318         public void setDate(String text) {
 319             int year, month, day;
 320             final Calendar c = GregorianCalendar.getInstance();
 321             Matcher m = reYMD.matcher(text);
 322             if (m.matches()) {
 323                 year = Integer.parseInt(m.group(1));
 324                 month = Integer.parseInt(m.group(2)) - 1;   // month is 0-based
 325                 day = Integer.parseInt(m.group(3));
 326             }
 327             else {
 328                 year = c.get(Calendar.YEAR);
 329                 m = reMD.matcher(text);
 330                 if (m.matches()) {
 331                     month = Integer.parseInt(m.group(1)) - 1;
 332                     day = Integer.parseInt(m.group(2));
 333                 }
 334                 else {
 335                     month = c.get(Calendar.MONTH);
 336                     m = reD.matcher(text);
 337                     if (m.matches()) {
 338                         day = Integer.parseInt(m.group(1));
 339                     }
 340                     else {
 341                         day = c.get(Calendar.DAY_OF_MONTH);
 342                     }
 343                 }
 344             }
 345
 346             c.set(year, month, day);
 347
 348             this.setDate(c.getTime());
 349         }
 350         public void observeDate(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 351                                 @NonNull androidx.lifecycle.Observer<? super Date> observer) {
 352             this.date.observe(owner, observer);
 353         }
 354         public void stopObservingDate(@NonNull androidx.lifecycle.Observer<? super Date> observer) {
 355             this.date.removeObserver(observer);
 356         }
 357         public String getDescription() {
 358             ensureType(ItemType.generalData);
 359             return description.getValue();
 360         }
 361         public void setDescription(String description) {
 362             ensureType(ItemType.generalData);
 363             this.description.setValue(description);
 364         }
 365         public void observeDescription(@NonNull @NotNull androidx.lifecycle.LifecycleOwner owner,
 366                                        @NonNull
 367                                                androidx.lifecycle.Observer<? super String> observer) {
 368             this.description.observe(owner, observer);
 369         }
 370         public void stopObservingDescription(
 371                 @NonNull androidx.lifecycle.Observer<? super String> observer) {
 372             this.description.removeObserver(observer);
 373         }
 374         public LedgerTransactionAccount getAccount() {
 375             ensureType(ItemType.transactionRow);
 376             return account;
 377         }
 378         public void setAccountName(String name) {
 379             account.setAccountName(name);
 380         }
 381         /**
 382          * getFormattedDate()
 383          *
 384          * @return nicely formatted, shortest available date representation
 385          */
 386         public String getFormattedDate() {
 387             if (date == null) return null;
 388             Date time = date.getValue();
 389             if (time == null) return null;
 390
 391             Calendar c = GregorianCalendar.getInstance();
 392             c.setTime(time);
 393             Calendar today = GregorianCalendar.getInstance();
 394
 395             final int myYear = c.get(Calendar.YEAR);
 396             final int myMonth = c.get(Calendar.MONTH);
 397             final int myDay = c.get(Calendar.DAY_OF_MONTH);
 398
 399             if (today.get(Calendar.YEAR) != myYear) {
 400                 return String.format(Locale.US, "%d/%02d/%02d", myYear, myMonth, myDay);
 401             }
 402
 403             if (today.get(Calendar.MONTH) != myMonth) {
 404                 return String.format(Locale.US, "%d/%02d", myMonth, myDay);
 405             }
 406
 407             return String.valueOf(myDay);
 408         }
 409         public void observeEditableFlag(NewTransactionActivity activity,
 410                                         Observer<Boolean> observer) {
 411             editable.observe(activity, observer);
 412         }
 413         public void stopObservingEditableFlag(Observer<Boolean> observer) {
 414             editable.removeObserver(observer);
 415         }
 416     }
 417 }