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