Generate small thumbnails for recipe previews and delete unused pics on import/syncs

app/src/main/java/xyz/pixelatedw/recipe/data/Recipe.kt

@@ -3,7 +3,6 @@ package xyz.pixelatedw.recipe.data
 import android.content.Context
 import android.graphics.Bitmap
 import android.graphics.BitmapFactory
-import android.widget.ImageView
 import androidx.core.net.toUri
 import androidx.room.Dao
 import androidx.room.Delete
@@ -18,6 +17,7 @@ import com.google.gson.reflect.TypeToken
 import java.io.File
 
 
+private val thumbnailsCache: HashMap<String, Bitmap> = hashMapOf()
 private val imagesCache: HashMap<String, Bitmap> = hashMapOf()
 
 @Entity
@@ -29,11 +29,29 @@ data class Recipe(
 	val content: String,
 	val hash: Int
 ) {
-	fun previewImage(ctx: Context, idx: Int): Bitmap? {
+	fun getThumbnail(ctx: Context, idx: Int): Bitmap? {
-		return showImage(ctx, idx)
+		val img = this.pics.getOrNull(idx)
+		if (img != null) {
+			val cachedImage = thumbnailsCache[img]
+			if (cachedImage != null) {
+				return cachedImage
+			}
+
+			val originalFile = File(ctx.filesDir, img)
+			val thumbnail = File(originalFile.parentFile, "thumb-${originalFile.name}")
+			if (thumbnail.exists()) {
+				ctx.contentResolver.openInputStream(thumbnail.toUri()).use {
+					val bitmapData = BitmapFactory.decodeStream(it)
+					thumbnailsCache[img] = bitmapData
+					return bitmapData
+				}
+			}
+		}
+
+		return null
 	}
 
-	fun showImage(ctx: Context, idx: Int): Bitmap? {
+	fun getFullImage(ctx: Context, idx: Int): Bitmap? {
 		val img = this.pics.getOrNull(idx)
 		if (img != null) {
 			val cachedImage = imagesCache[img]
@@ -53,6 +71,36 @@ data class Recipe(
 
 		return null
 	}
+
+	fun generateThumbnails(ctx: Context) {
+		for (img in this.pics) {
+			val file = File(ctx.filesDir, img)
+			ctx.contentResolver.openInputStream(file.toUri()).use {
+				var bitmapData = BitmapFactory.decodeStream(it)
+				val aspectRatio: Float = bitmapData.getWidth() / bitmapData.getHeight().toFloat()
+				val width = 256
+				val height = Math.round(width / aspectRatio)
+				bitmapData = Bitmap.createScaledBitmap(bitmapData, width, height, true);
+
+				val thumbnailName = "thumb-${file.name}"
+				val thumbnailFile = File(file.parentFile, thumbnailName)
+				if (!thumbnailFile.exists()) {
+					thumbnailFile.createNewFile();
+				}
+
+				ctx.contentResolver.openOutputStream(thumbnailFile.toUri()).use { out ->
+					bitmapData.compress(Bitmap.CompressFormat.PNG, 100, out!!)
+				}
+			}
+		}
+	}
+
+	companion object {
+		fun clearCache() {
+			thumbnailsCache.clear()
+			imagesCache.clear()
+		}
+	}
 }
 
 inline fun <reified T> Gson.fromJson(json: String?): T = fromJson<T>(json, object: TypeToken<T>() {}.type)
@@ -71,6 +119,9 @@ class PicsTypeConvertor {
 
 @Dao
 interface RecipeDao {
+	@Query("SELECT * FROM recipe")
+	fun getAll(): List<Recipe>
+
 	@Insert(onConflict = OnConflictStrategy.REPLACE)
 	fun insert(recipe: Recipe)
 

app/src/main/java/xyz/pixelatedw/recipe/ui/components/RecipeInfo.kt

@@ -17,17 +17,13 @@ import androidx.compose.foundation.lazy.grid.GridCells
 import androidx.compose.foundation.lazy.grid.LazyHorizontalGrid
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
-import androidx.compose.material3.Button
-import androidx.compose.material3.ButtonDefaults
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Switch
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
-import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.asImageBitmap
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.text.style.TextAlign
@@ -84,7 +80,7 @@ fun RecipeInfo(
 				contentPadding = PaddingValues(horizontal = 64.dp)
 			) {
 				items(picsCounts) { idx ->
-					val pic = active.recipe.showImage(ctx, idx)
+					val pic = active.recipe.getFullImage(ctx, idx)
 					if (pic != null) {
 						Image(
 							bitmap = pic.asImageBitmap(),

app/src/main/java/xyz/pixelatedw/recipe/ui/components/RecipePreview.kt

@@ -14,8 +14,6 @@ import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
-import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.width
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
@@ -78,7 +76,7 @@ fun RecipePreview(
 						.togetherWith(fadeOut(animationSpec = tween(500)))
 				}
 			) { targetImage ->
-				val displayImage = entry.recipe.previewImage(LocalContext.current, targetImage)
+				val displayImage = entry.recipe.getThumbnail(LocalContext.current, targetImage)
 				if (displayImage != null) {
 					Image(
 						bitmap = displayImage.asImageBitmap(),

app/src/main/java/xyz/pixelatedw/recipe/utils/RecipeParser.kt

@@ -13,6 +13,9 @@ import java.io.BufferedReader
 import java.io.File
 import java.io.FileOutputStream
 import java.io.InputStreamReader
+import kotlin.io.path.Path
+import kotlin.io.path.absolutePathString
+import kotlin.io.path.fileSize
 
 private val recipeFiles = mutableListOf<DocumentFile>()
 
@@ -50,6 +53,33 @@ fun parseRecipeFiles(ctx: MainActivity) {
 			ctx.db.tagDao().delete(tag.name)
 		}
 	}
+
+	// Generate a list with all the pics used by all the registered recipes
+	val usedPics = ctx.db.recipeDao().getAll()
+		.asSequence()
+		.flatMap { it.pics }
+		.map { File(it) }
+		.map { p ->
+			val list = mutableListOf<String>()
+
+			list.add(p.name)
+			list.add("thumb-${p.name}")
+
+			list
+		}
+		.flatten()
+		.toList()
+
+	// Clear unused images
+	ctx.filesDir.walkTopDown().forEach {
+		if (it.name.endsWith(".jpg") && !usedPics.contains(it.name)) {
+			it.delete()
+		}
+	}
+
+	Recipe.clearCache()
+
+//	ctx.filesDir.walkTopDown().forEach { println(it.absolutePath + " | " + Path(it.absolutePath).fileSize()) }
 }
 
 fun parseDir(ctx: Context, dir: DocumentFile, path: String) {
@@ -70,7 +100,6 @@ fun handleFile(ctx: Context, file: DocumentFile, path: String) {
 	}
 
 	val fileName = file.name ?: return
-//	println("file: ${file.name} | ${file.uri.path} | ${file.length()}")
 
 	if (fileName.endsWith(".jpg")) {
 		val picsDir = File(ctx.filesDir, path)
@@ -163,5 +192,7 @@ fun parseRecipe(ctx: MainActivity, lastModified: Long, text: String) {
 		hash = hash
 	)
 
+	recipe.generateThumbnails(ctx)
+
 	ctx.db.recipeDao().insert(recipe)
 }