app/src/main/java/net/ktnx/mobileledger/ui/templates/TemplateDetailsViewModel.java

   1 /*
   2  * Copyright © 2021 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.templates;
  19
  20 import android.os.AsyncTask;
  21
  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.BuildConfig;
  28 import net.ktnx.mobileledger.dao.TemplateAccountDAO;
  29 import net.ktnx.mobileledger.dao.TemplateHeaderDAO;
  30 import net.ktnx.mobileledger.db.DB;
  31 import net.ktnx.mobileledger.db.TemplateAccount;
  32 import net.ktnx.mobileledger.db.TemplateHeader;
  33 import net.ktnx.mobileledger.db.TemplateWithAccounts;
  34 import net.ktnx.mobileledger.model.TemplateDetailsItem;
  35 import net.ktnx.mobileledger.utils.Logger;
  36
  37 import java.util.ArrayList;
  38 import java.util.Collections;
  39 import java.util.List;
  40 import java.util.Locale;
  41 import java.util.Objects;
  42 import java.util.concurrent.atomic.AtomicInteger;
  43
  44 public class TemplateDetailsViewModel extends ViewModel {
  45     private final MutableLiveData<List<TemplateDetailsItem>> items =
  46             new MutableLiveData<>(Collections.emptyList());
  47     private final AtomicInteger syntheticItemId = new AtomicInteger(0);
  48     private Long mPatternId;
  49     private String mDefaultPatternName;
  50     private boolean itemsLoaded = false;
  51     public String getDefaultPatternName() {
  52         return mDefaultPatternName;
  53     }
  54     public void setDefaultPatternName(String name) {
  55         mDefaultPatternName = name;
  56     }
  57
  58     public void resetItems() {
  59         applyList(new ArrayList<>());
  60     }
  61     public void applyList(List<TemplateDetailsItem> srcList) {
  62         applyList(srcList, false);
  63     }
  64     public void applyList(List<TemplateDetailsItem> srcList, boolean async) {
  65         boolean changes;
  66         if (srcList == null) {
  67             srcList = new ArrayList<>(items.getValue());
  68             changes = false;
  69         }
  70         else
  71             changes = true;
  72
  73         srcList = Collections.unmodifiableList(srcList);
  74
  75         {
  76             Logger.debug("tmpl", "Considering old list");
  77             for (TemplateDetailsItem item : srcList)
  78                 Logger.debug("tmpl", String.format(Locale.US, " id %d pos %d", item.getId(),
  79                         item.getPosition()));
  80         }
  81
  82         ArrayList<TemplateDetailsItem> newList = new ArrayList<>();
  83
  84         boolean hasEmptyItem = false;
  85
  86         if (srcList.size() < 1) {
  87             final TemplateDetailsItem.Header header = TemplateDetailsItem.createHeader();
  88             header.setName(mDefaultPatternName);
  89             header.setId(0);
  90             newList.add(header);
  91             changes = true;
  92         }
  93         else {
  94             newList.add(srcList.get(0));
  95         }
  96
  97         for (int i = 1; i < srcList.size(); i++) {
  98             final TemplateDetailsItem.AccountRow accRow = srcList.get(i)
  99                                                                  .asAccountRowItem();
 100             if (accRow.isEmpty()) {
 101                 // it is normal to have two empty rows if they are at the
 102                 // top (position 1 and 2)
 103                 if (!hasEmptyItem || i < 3) {
 104                     accRow.setPosition(newList.size());
 105                     newList.add(accRow);
 106                 }
 107                 else
 108                     changes = true; // row skipped
 109
 110                 hasEmptyItem = true;
 111             }
 112             else {
 113                 accRow.setPosition(newList.size());
 114                 newList.add(accRow);
 115             }
 116         }
 117
 118         while (newList.size() < 3) {
 119             final TemplateDetailsItem.AccountRow accountRow =
 120                     TemplateDetailsItem.createAccountRow();
 121             accountRow.setId(genItemId());
 122             accountRow.setPosition(newList.size());
 123             newList.add(accountRow);
 124             changes = true;
 125             hasEmptyItem = true;
 126         }
 127
 128         if (!hasEmptyItem) {
 129             final TemplateDetailsItem.AccountRow accountRow =
 130                     TemplateDetailsItem.createAccountRow();
 131             accountRow.setId(genItemId());
 132             accountRow.setPosition(newList.size());
 133             newList.add(accountRow);
 134             changes = true;
 135         }
 136
 137         if (changes) {
 138             Logger.debug("tmpl", "Changes detected, applying new list");
 139
 140             if (async)
 141                 items.postValue(newList);
 142             else
 143                 items.setValue(newList);
 144         }
 145         else
 146             Logger.debug("tmpl", "No changes, ignoring new list");
 147     }
 148     public int genItemId() {
 149         return syntheticItemId.decrementAndGet();
 150     }
 151     public LiveData<List<TemplateDetailsItem>> getItems(Long patternId) {
 152         if (itemsLoaded && Objects.equals(patternId, this.mPatternId))
 153             return items;
 154
 155         if (patternId != null && patternId <= 0)
 156             throw new IllegalArgumentException("Pattern ID " + patternId + " is invalid");
 157
 158         mPatternId = patternId;
 159
 160         if (mPatternId == null) {
 161             resetItems();
 162             itemsLoaded = true;
 163             return items;
 164         }
 165
 166         DB db = DB.get();
 167         LiveData<TemplateWithAccounts> dbList = db.getTemplateDAO()
 168                                                   .getTemplateWithAccounts(mPatternId);
 169         Observer<TemplateWithAccounts> observer = new Observer<TemplateWithAccounts>() {
 170             @Override
 171             public void onChanged(TemplateWithAccounts src) {
 172                 ArrayList<TemplateDetailsItem> l = new ArrayList<>();
 173
 174                 TemplateDetailsItem header = TemplateDetailsItem.fromRoomObject(src.header);
 175                 Logger.debug("tmpl-db", "Got header template item with id of " + header.getId());
 176                 l.add(header);
 177                 Collections.sort(src.accounts,
 178                         (o1, o2) -> Long.compare(o1.getPosition(), o2.getPosition()));
 179                 for (TemplateAccount acc : src.accounts) {
 180                     l.add(TemplateDetailsItem.fromRoomObject(acc));
 181                 }
 182
 183                 for (TemplateDetailsItem i : l) {
 184                     Logger.debug("tmpl-db", "Loaded pattern item " + i);
 185                 }
 186                 applyList(l, true);
 187                 itemsLoaded = true;
 188
 189                 dbList.removeObserver(this);
 190             }
 191         };
 192         dbList.observeForever(observer);
 193
 194         return items;
 195     }
 196     public void setTestText(String text) {
 197         List<TemplateDetailsItem> list = new ArrayList<>(items.getValue());
 198         TemplateDetailsItem.Header header = new TemplateDetailsItem.Header(list.get(0)
 199                                                                                .asHeaderItem());
 200         header.setTestText(text);
 201         list.set(0, header);
 202
 203         items.setValue(list);
 204     }
 205     public void onSaveTemplate() {
 206         Logger.debug("flow", "PatternDetailsViewModel.onSavePattern(); model=" + this);
 207         final List<TemplateDetailsItem> list = Objects.requireNonNull(items.getValue());
 208
 209         AsyncTask.execute(() -> {
 210             boolean newPattern = mPatternId == null || mPatternId <= 0;
 211
 212             TemplateDetailsItem.Header modelHeader = list.get(0)
 213                                                          .asHeaderItem();
 214             TemplateHeaderDAO headerDAO = DB.get()
 215                                             .getTemplateDAO();
 216             TemplateHeader dbHeader = modelHeader.toDBO();
 217             if (newPattern) {
 218                 dbHeader.setId(null);
 219                 dbHeader.setId(mPatternId = headerDAO.insertSync(dbHeader));
 220             }
 221             else
 222                 headerDAO.updateSync(dbHeader);
 223
 224             Logger.debug("pattern-db",
 225                     String.format(Locale.US, "Stored pattern header %d, item=%s", dbHeader.getId(),
 226                             modelHeader));
 227
 228
 229             TemplateAccountDAO taDAO = DB.get()
 230                                          .getTemplateAccountDAO();
 231             taDAO.prepareForSave(mPatternId);
 232             for (int i = 1; i < list.size(); i++) {
 233                 final TemplateDetailsItem.AccountRow accRowItem = list.get(i)
 234                                                                       .asAccountRowItem();
 235                 TemplateAccount dbAccount = accRowItem.toDBO(dbHeader.getId());
 236                 dbAccount.setTemplateId(mPatternId);
 237                 dbAccount.setPosition(i);
 238                 if (dbAccount.getId() < 0) {
 239                     dbAccount.setId(null);
 240                     dbAccount.setId(taDAO.insertSync(dbAccount));
 241                 }
 242                 else
 243                     taDAO.updateSync(dbAccount);
 244
 245                 Logger.debug("pattern-db", String.format(Locale.US,
 246                         "Stored pattern account %d, account=%s, comment=%s, neg=%s, item=%s",
 247                         dbAccount.getId(), dbAccount.getAccountName(),
 248                         dbAccount.getAccountComment(), dbAccount.getNegateAmount(), accRowItem));
 249             }
 250             taDAO.finishSave(mPatternId);
 251         });
 252     }
 253     private ArrayList<TemplateDetailsItem> copyItems() {
 254         List<TemplateDetailsItem> oldList = items.getValue();
 255         ArrayList<TemplateDetailsItem> result = new ArrayList<>(oldList.size());
 256
 257         for (TemplateDetailsItem item : oldList) {
 258             if (item instanceof TemplateDetailsItem.Header)
 259                 result.add(new TemplateDetailsItem.Header(item.asHeaderItem()));
 260             else if (item instanceof TemplateDetailsItem.AccountRow)
 261                 result.add(new TemplateDetailsItem.AccountRow(item.asAccountRowItem()));
 262             else
 263                 throw new RuntimeException("Unexpected item " + item);
 264         }
 265
 266         return result;
 267     }
 268     public void moveItem(int sourcePos, int targetPos) {
 269         final List<TemplateDetailsItem> newList = copyItems();
 270
 271         if (BuildConfig.DEBUG) {
 272             Logger.debug("drag", "Before move:");
 273             for (int i = 1; i < newList.size(); i++) {
 274                 final TemplateDetailsItem item = newList.get(i);
 275                 Logger.debug("drag",
 276                         String.format(Locale.US, "  %d: id %d, pos %d", i, item.getId(),
 277                                 item.getPosition()));
 278             }
 279         }
 280
 281         {
 282             TemplateDetailsItem item = newList.remove(sourcePos);
 283             newList.add(targetPos, item);
 284         }
 285
 286         // adjust affected items' positions
 287         {
 288             int startPos, endPos;
 289             if (sourcePos < targetPos) {
 290                 // moved down
 291                 startPos = sourcePos;
 292                 endPos = targetPos;
 293             }
 294             else {
 295                 // moved up
 296                 startPos = targetPos;
 297                 endPos = sourcePos;
 298             }
 299
 300             for (int i = startPos; i <= endPos; i++) {
 301                 newList.get(i)
 302                        .setPosition(i);
 303             }
 304         }
 305
 306         if (BuildConfig.DEBUG) {
 307             Logger.debug("drag", "After move:");
 308             for (int i = 1; i < newList.size(); i++) {
 309                 final TemplateDetailsItem item = newList.get(i);
 310                 Logger.debug("drag",
 311                         String.format(Locale.US, "  %d: id %d, pos %d", i, item.getId(),
 312                                 item.getPosition()));
 313             }
 314         }
 315
 316         items.setValue(newList);
 317     }
 318     public void removeItem(int position) {
 319         Logger.debug("tmpl", "Removing item at position " + position);
 320         ArrayList<TemplateDetailsItem> newList = copyItems();
 321         newList.remove(position);
 322         for (int i = position; i < newList.size(); i++)
 323             newList.get(i)
 324                    .setPosition(i);
 325         applyList(newList);
 326     }
 327 }