Cache conversation messages

lib/helpers/conversations_helper.dart

@@ -1,3 +1,4 @@
+import 'package:comunic/helpers/database/conversation_messages_database_helper.dart';
 import 'package:comunic/helpers/database/conversations_database_helper.dart';
 import 'package:comunic/helpers/users_helper.dart';
 import 'package:comunic/lists/conversation_messages_list.dart';
@@ -19,6 +20,8 @@ enum SendMessageResult { SUCCESS, MESSAGE_REJECTED, FAILED }
 class ConversationsHelper {
   final ConversationsDatabaseHelper _conversationsDatabaseHelper =
       ConversationsDatabaseHelper();
+  final ConversationMessagesDatabaseHelper _conversationMessagesDatabaseHelper =
+      ConversationMessagesDatabaseHelper();
 
   /// Download the list of conversations from the server
   Future<ConversationsList> downloadList() async {
@@ -152,12 +155,16 @@ class ConversationsHelper {
     response.getArray().forEach((f) {
       list.add(ConversationMessage(
           id: f["ID"],
+          conversationID: conversationID,
           userID: f["ID_user"],
           timeInsert: f["time_insert"],
           message: f["message"],
           imageURL: f["image_path"]));
     });
 
+    // Save messages in the cache
+    _conversationMessagesDatabaseHelper.insertOrUpdateAll(list);
+
     return list;
   }
 
@@ -173,8 +180,7 @@ class ConversationsHelper {
     );
 
     //Check for image
-    if(message.hasImage)
-      request.addFile("image", message.image);
+    if (message.hasImage) request.addFile("image", message.image);
 
     //Send the message
     APIResponse response;
@@ -185,8 +191,7 @@ class ConversationsHelper {
 
     if (response.code == 401)
       return SendMessageResult.MESSAGE_REJECTED;
-    else if(response.code != 200)
-      return SendMessageResult.FAILED;
+    else if (response.code != 200) return SendMessageResult.FAILED;
 
     return SendMessageResult.SUCCESS;
   }

lib/helpers/database/conversation_messages_database_helper.dart

@@ -0,0 +1,21 @@
+import 'package:comunic/helpers/database/database_contract.dart';
+import 'package:comunic/helpers/database/model_database_helper.dart';
+import 'package:comunic/models/conversation_message.dart';
+
+/// Conversation messages database helper
+///
+/// @author Pierre HUBERT
+
+class ConversationMessagesDatabaseHelper extends ModelDatabaseHelper<ConversationMessage> {
+
+  @override
+  ConversationMessage initializeFromMap(Map<String, dynamic> map) {
+    return ConversationMessage.fromMap(map);
+  }
+
+  @override
+  String tableName() {
+    return ConversationsMessagesTableContract.TABLE_NAME;
+  }
+
+}

lib/helpers/database/database_contract.dart

@@ -35,3 +35,14 @@ abstract class ConversationTableContract {
   static const C_SAW_LAST_MESSAGE = "saw_last_message";
   static const C_MEMBERS = "members";
 }
+
+/// Conversations messages table contract
+abstract class ConversationsMessagesTableContract {
+  static const TABLE_NAME = "conversations_messages";
+  static const C_ID = BaseTableContract.C_ID;
+  static const C_CONVERSATION_ID = "conversation_id";
+  static const C_USER_ID = "user_id";
+  static const C_TIME_INSERT = "time_insert";
+  static const C_MESSAGE = "message";
+  static const C_IMAGE_URL = "image_url";
+}

lib/helpers/database/database_helper.dart

@@ -38,8 +38,12 @@ abstract class DatabaseHelper {
     await db.execute("DROP TABLE IF EXISTS ${UserTableContract.TABLE_NAME}");
 
     // Drop conversations table
-    await db
-        .execute("DROP TABLE IF EXISTS ${ConversationTableContract.TABLE_NAME}");
+    await db.execute(
+        "DROP TABLE IF EXISTS ${ConversationTableContract.TABLE_NAME}");
+
+    // Drop conversations messages table
+    await db.execute(
+        "DROP TABLE IF EXISTS ${ConversationsMessagesTableContract.TABLE_NAME}");
 
     // Initialize database again
     await _initializeDatabase(db, newVersion);
@@ -67,5 +71,16 @@ abstract class DatabaseHelper {
         "${ConversationTableContract.C_SAW_LAST_MESSAGE} INTEGER, "
         "${ConversationTableContract.C_MEMBERS} TEXT"
         ")");
+
+    // Create conversation messages table
+    await db.execute(
+        "CREATE TABLE ${ConversationsMessagesTableContract.TABLE_NAME} ("
+        "${ConversationsMessagesTableContract.C_ID} INTEGER PRIMARY KEY, "
+        "${ConversationsMessagesTableContract.C_CONVERSATION_ID} INTEGER, "
+        "${ConversationsMessagesTableContract.C_USER_ID} INTEGER, "
+        "${ConversationsMessagesTableContract.C_TIME_INSERT} INTEGER, "
+        "${ConversationsMessagesTableContract.C_MESSAGE} TEXT, "
+        "${ConversationsMessagesTableContract.C_IMAGE_URL} TEXT"
+        ")");
   }
 }

lib/models/conversation_message.dart

@@ -1,11 +1,14 @@
+import 'package:comunic/helpers/database/database_contract.dart';
+import 'package:comunic/models/cache_model.dart';
 import 'package:meta/meta.dart';
 
 /// Single conversation message
 ///
 /// @author Pierre HUBERT
 
-class ConversationMessage implements Comparable {
+class ConversationMessage extends CacheModel implements Comparable {
   final int id;
+  final int conversationID;
   final int userID;
   final int timeInsert;
   final String message;
@@ -13,6 +16,7 @@ class ConversationMessage implements Comparable {
 
   const ConversationMessage({
     @required this.id,
+    @required this.conversationID,
     @required this.userID,
     @required this.timeInsert,
     @required this.message,
@@ -20,15 +24,38 @@ class ConversationMessage implements Comparable {
   })  : assert(id != null),
         assert(userID != null),
         assert(timeInsert != null),
-        assert(message != null);
+        assert(message != null),
+        super(id: id);
 
   DateTime get date => DateTime.fromMillisecondsSinceEpoch(timeInsert * 1000);
-  bool get hasMessage => message != null && message.length > 0;
-  bool get hasImage => imageURL != null;
 
+  bool get hasMessage => message != null && message.length > 0;
+
+  bool get hasImage => imageURL != null && imageURL != "null";
 
   @override
   int compareTo(other) {
     return id.compareTo(other.id);
   }
+
+  @override
+  Map<String, dynamic> toMap() {
+    return {
+      ConversationsMessagesTableContract.C_ID: id,
+      ConversationsMessagesTableContract.C_CONVERSATION_ID: conversationID,
+      ConversationsMessagesTableContract.C_USER_ID: userID,
+      ConversationsMessagesTableContract.C_TIME_INSERT: timeInsert,
+      ConversationsMessagesTableContract.C_MESSAGE: message,
+      ConversationsMessagesTableContract.C_IMAGE_URL: imageURL
+    };
+  }
+
+  ConversationMessage.fromMap(Map<String, dynamic> map)
+      : id = map[ConversationsMessagesTableContract.C_ID],
+        conversationID = map[ConversationsMessagesTableContract.C_CONVERSATION_ID],
+        userID = map[ConversationsMessagesTableContract.C_USER_ID],
+        timeInsert = map[ConversationsMessagesTableContract.C_TIME_INSERT],
+        message = map[ConversationsMessagesTableContract.C_MESSAGE],
+        imageURL = map[ConversationsMessagesTableContract.C_IMAGE_URL],
+        super.fromMap(map);
 }