Implement favorite feature

app/build.gradle.kts

@@ -2,6 +2,7 @@ plugins {
     alias(libs.plugins.android.application)
     alias(libs.plugins.kotlin.android)
     alias(libs.plugins.kotlin.compose)
+    id("com.google.devtools.ksp")
 }
 
 android {
@@ -81,11 +82,19 @@ dependencies {
     implementation(libs.ktor.client.content.negotiation)
     implementation(libs.ktor.client.logging)
 
+    implementation(libs.androidx.room.runtime)
+    ksp(libs.androidx.room.compiler)
+    implementation(libs.androidx.room.ktx)
+
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)
     androidTestImplementation(platform(libs.androidx.compose.bom))
     androidTestImplementation(libs.androidx.ui.test.junit4)
     debugImplementation(libs.androidx.ui.tooling)
     debugImplementation(libs.androidx.ui.test.manifest)
+}
+
+ksp {
+    arg("room.schemaLocation", "$projectDir/schemas")
 }

app/schemas/com.paulcoding.hviewer.database.AppDatabase/1.json

@@ -0,0 +1,52 @@
+{
+  "formatVersion": 1,
+  "database": {
+    "version": 1,
+    "identityHash": "f8c3310b39b34e0c6c9c004f8557d416",
+    "entities": [
+      {
+        "tableName": "favorite_posts",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`url` TEXT NOT NULL, `name` TEXT NOT NULL, `thumbnail` TEXT NOT NULL, `site` TEXT NOT NULL, PRIMARY KEY(`url`))",
+        "fields": [
+          {
+            "fieldPath": "url",
+            "columnName": "url",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "name",
+            "columnName": "name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "thumbnail",
+            "columnName": "thumbnail",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "site",
+            "columnName": "site",
+            "affinity": "TEXT",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "autoGenerate": false,
+          "columnNames": [
+            "url"
+          ]
+        },
+        "indices": [],
+        "foreignKeys": []
+      }
+    ],
+    "views": [],
+    "setupQueries": [
+      "CREATE TABLE IF NOT EXISTS room_master_table (id INTEGER PRIMARY KEY,identity_hash TEXT)",
+      "INSERT OR REPLACE INTO room_master_table (id,identity_hash) VALUES(42, 'f8c3310b39b34e0c6c9c004f8557d416')"
+    ]
+  }
+}

app/schemas/com.paulcoding.hviewer.database.AppDatabase/2.json

@@ -0,0 +1,52 @@
+{
+  "formatVersion": 1,
+  "database": {
+    "version": 2,
+    "identityHash": "f8c3310b39b34e0c6c9c004f8557d416",
+    "entities": [
+      {
+        "tableName": "favorite_posts",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`url` TEXT NOT NULL, `name` TEXT NOT NULL, `thumbnail` TEXT NOT NULL, `site` TEXT NOT NULL, PRIMARY KEY(`url`))",
+        "fields": [
+          {
+            "fieldPath": "url",
+            "columnName": "url",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "name",
+            "columnName": "name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "thumbnail",
+            "columnName": "thumbnail",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "site",
+            "columnName": "site",
+            "affinity": "TEXT",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "autoGenerate": false,
+          "columnNames": [
+            "url"
+          ]
+        },
+        "indices": [],
+        "foreignKeys": []
+      }
+    ],
+    "views": [],
+    "setupQueries": [
+      "CREATE TABLE IF NOT EXISTS room_master_table (id INTEGER PRIMARY KEY,identity_hash TEXT)",
+      "INSERT OR REPLACE INTO room_master_table (id,identity_hash) VALUES(42, 'f8c3310b39b34e0c6c9c004f8557d416')"
+    ]
+  }
+}

app/schemas/com.paulcoding.hviewer.database.AppDatabase/3.json

@@ -0,0 +1,58 @@
+{
+  "formatVersion": 1,
+  "database": {
+    "version": 3,
+    "identityHash": "40109ede6ba29fdee1d23735114a2981",
+    "entities": [
+      {
+        "tableName": "favorite_posts",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`url` TEXT NOT NULL, `name` TEXT NOT NULL, `thumbnail` TEXT NOT NULL, `site` TEXT NOT NULL, `createdAt` INTEGER NOT NULL, PRIMARY KEY(`url`))",
+        "fields": [
+          {
+            "fieldPath": "url",
+            "columnName": "url",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "name",
+            "columnName": "name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "thumbnail",
+            "columnName": "thumbnail",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "site",
+            "columnName": "site",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "createdAt",
+            "columnName": "createdAt",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "autoGenerate": false,
+          "columnNames": [
+            "url"
+          ]
+        },
+        "indices": [],
+        "foreignKeys": []
+      }
+    ],
+    "views": [],
+    "setupQueries": [
+      "CREATE TABLE IF NOT EXISTS room_master_table (id INTEGER PRIMARY KEY,identity_hash TEXT)",
+      "INSERT OR REPLACE INTO room_master_table (id,identity_hash) VALUES(42, '40109ede6ba29fdee1d23735114a2981')"
+    ]
+  }
+}

app/src/main/java/com/paulcoding/hviewer/database/AppDatabase.kt

@@ -0,0 +1,10 @@
+package com.paulcoding.hviewer.database
+
+import androidx.room.Database
+import androidx.room.RoomDatabase
+import com.paulcoding.hviewer.model.PostItem
+
+@Database(entities = [PostItem::class], version = 3, exportSchema = true)
+abstract class AppDatabase : RoomDatabase() {
+    abstract fun favoritePostDao(): FavoritePostDao
+}

app/src/main/java/com/paulcoding/hviewer/database/DatabaseProvider.kt

@@ -0,0 +1,20 @@
+package com.paulcoding.hviewer.database
+
+import androidx.room.Room
+import com.paulcoding.hviewer.MainApp.Companion.appContext
+
+object DatabaseProvider {
+    private var db: AppDatabase? = null
+
+    fun getInstance(): AppDatabase {
+        if (db == null) {
+            db = Room.databaseBuilder(
+                appContext,
+                AppDatabase::class.java, "hviewer_db"
+            )
+                .addMigrations(MIGRATION_1_2, MIGRATION_2_3)
+                .build()
+        }
+        return db!!
+    }
+}

app/src/main/java/com/paulcoding/hviewer/database/FavoriteDao.kt

@@ -0,0 +1,21 @@
+package com.paulcoding.hviewer.database
+
+import androidx.room.Dao
+import androidx.room.Delete
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import com.paulcoding.hviewer.model.PostItem
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface FavoritePostDao {
+    @Query("SELECT * FROM favorite_posts ORDER BY createdAt DESC")
+    fun getAll(): Flow<List<PostItem>>
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insert(post: PostItem)
+
+    @Delete
+    suspend fun delete(post: PostItem)
+}

app/src/main/java/com/paulcoding/hviewer/database/Migrations.kt

@@ -0,0 +1,16 @@
+package com.paulcoding.hviewer.database
+
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
+
+val MIGRATION_1_2 = object : Migration(1, 2) {
+    override fun migrate(db: SupportSQLiteDatabase) {
+        db.execSQL("ALTER TABLE favorite_posts ADD COLUMN site TEXT NOT NULL DEFAULT \"\"")
+    }
+}
+
+val MIGRATION_2_3 = object : Migration(2, 3) {
+    override fun migrate(db: SupportSQLiteDatabase) {
+        db.execSQL("ALTER TABLE favorite_posts ADD COLUMN createdAt INTEGER NOT NULL DEFAULT 0")
+    }
+}

app/src/main/java/com/paulcoding/hviewer/model/PostModel.kt

@@ -1,16 +1,23 @@
 package com.paulcoding.hviewer.model
 
+ import androidx.room.Entity
+import androidx.room.PrimaryKey
+
 data class PostData(
     val images: List<String>,
     val total: Int,
     val next: String? = null
 )
 
 
+@Entity(tableName = "favorite_posts")
 data class PostItem(
-    val name: String = "",
+    @PrimaryKey
     val url: String = "",
+    val name: String = "",
     val thumbnail: String = "",
+    val site: String = "",
+    val createdAt: Long = 0,
 )
 
 data class Posts(

app/src/main/java/com/paulcoding/hviewer/ui/component/HIcon.kt

@@ -2,10 +2,14 @@ package com.paulcoding.hviewer.ui.component
 
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.outlined.ArrowBack
+import androidx.compose.material.icons.filled.Favorite
+import androidx.compose.material.icons.filled.FavoriteBorder
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
+import androidx.compose.material3.LocalContentColor
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.vector.ImageVector
 import com.paulcoding.hviewer.ui.icon.SettingsIcon
 
@@ -16,14 +20,22 @@ fun HBackIcon(onClick: () -> Unit) {
     }
 }
 
+@Composable
+fun HFavoriteIcon(modifier: Modifier = Modifier, isFavorite: Boolean, onClick: () -> Unit) {
+    val icon = if (isFavorite) Icons.Filled.Favorite else Icons.Filled.FavoriteBorder
+    val tint: Color = if (isFavorite) Color.Red else Color.Gray
+    HIcon(modifier = modifier, imageVector = icon, tint = tint, onClick = onClick)
+}
+
 @Composable
 fun HIcon(
     modifier: Modifier = Modifier,
     imageVector: ImageVector = SettingsIcon,
     description: String = "",
+    tint: Color = LocalContentColor.current,
     onClick: () -> Unit
 ) {
     IconButton(onClick = { onClick() }, modifier = modifier) {
-        Icon(imageVector, description)
+        Icon(imageVector, description, tint = tint)
     }
 }