add delta sync for dm-v9
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# Instant Media Loading Implementation Plan
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# Implementation Plan - Optimize ImageLoader Usage
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Optimize the loading of images and video thumbnails in the chat room to ensure they appear instantly without "blank" moments.
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Ensure all components, specifically `Loaded_setting_profile_page`, use the optimized global `ImageLoader` provided by `MyApplication` to prevent resource waste and improve performance.
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## User Review Required
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> [!IMPORTANT]
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> I will be configuring a global `ImageLoader` for the entire app. This centralizes the logic for decoding videos, GIFs, and SVGs, which improves performance and reduces memory usage.
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> I will be removing local `ImageLoader` initializations in `Login_Page.kt` and potentially other files. These components will now rely on the singleton `ImageLoader` configured in `MyApplication.kt`.
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## Proposed Changes
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### [Core Framework]
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### [Component Name] Global Image Loader Optimization
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#### [MODIFY] [MyApplication.kt](file:///home/eric/StudioProjects/Kotlin-Chat-Software/app/src/main/java/com/example/login_v3/MyApplication.kt)
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- Implement `ImageLoaderFactory` to provide a singleton `ImageLoader`.
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- Configure the `ImageLoader` with specialized decoders:
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- `VideoFrameDecoder`: For video thumbnails.
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- `GifDecoder` / `ImageDecoderDecoder`: For GIF support.
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- `SvgDecoder`: For SVG support.
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- Set up optimized memory and disk caching.
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- Ensure the `ImageLoader` is correctly configured and accessible. (Already looks good, but will double-check).
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### [Data Model]
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#### [MODIFY] [Technologia.kt](file:///home/eric/StudioProjects/Kotlin-Chat-Software/app/src/main/java/com/example/login_v3/Technologia.kt)
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- Wrap the root composable with `CompositionLocalProvider(LocalImageLoader provides LocalContext.current.imageLoader)` to ensure all `AsyncImage` calls use the global singleton.
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#### [MODIFY] [DM_Basic.kt](file:///home/eric/StudioProjects/Kotlin-Chat-Software/app/src/main/java/com/example/login_v3/data/api/api_class/DM_Basic.kt)
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- Add extension properties to the `Message` class:
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- `mediaUrl`: Centralized logic for calculating the full URL for attachments.
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- `isImage`, `isVideo`, `isAudio`, `isGif`, `isFile`: Boolean helpers to simplify UI logic.
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#### [MODIFY] [Login_Page.kt](file:///home/eric/StudioProjects/Kotlin-Chat-Software/app/src/main/java/com/example/login_v3/auth/login/Login_Page.kt)
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- Refactor `SvgImage` to use `AsyncImage` with the global loader.
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- Remove redundant local `ImageLoader` builder.
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### [Chat Feature]
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#### [MODIFY] [setting_Profile_Page.kt](file:///home/eric/StudioProjects/Kotlin-Chat-Software/app/src/main/java/com/example/login_v3/home/setting/setting_detail_page/detail_UI/setting_Profile_Page.kt)
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- Ensure `AsyncImage` calls in `Loaded_setting_profile_page` are optimized.
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- (Optional) Use `LocalImageLoader.current` if we decide to provide it via `CompositionLocalProvider` for better control, though `MyApplication`'s factory is usually sufficient.
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#### [MODIFY] [Message_Messaging_ViewModel.kt](file:///home/eric/StudioProjects/Kotlin-Chat-Software/app/src/main/java/com/example/login_v3/home/Message/ViewModel/Detail/Message_Messaging_ViewModel.kt)
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- Implement a pre-fetching mechanism. When messages are loaded into the `uiState`, the ViewModel will trigger Coil to pre-download and cache the media URLs.
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#### [MODIFY] [Message_Messaging.kt](file:///home/eric/StudioProjects/Kotlin-Chat-Software/app/src/main/java/com/example/login_v3/home/Message/UI/Detail/Message_Messaging.kt)
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- Simplify `MessageRow` by using the new properties from the `Message` class.
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- Remove redundant local `ImageLoader` initializations.
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- Ensure `AsyncImage` uses the optimized global `ImageLoader`.
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#### [MODIFY] [Add_Account_Page.kt](file:///home/eric/StudioProjects/Kotlin-Chat-Software/app/src/main/java/com/example/login_v3/auth/SwitchAccount/Add_Account_Page.kt)
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- Remove unused `ImageLoader` and `SvgDecoder` imports.
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## Verification Plan
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### Automated Tests
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- Build the project to ensure no compilation errors after removing redundant imports and loaders.
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### Manual Verification
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- **Entering Room:** Enter a chat room with images/videos and verify they appear nearly instantly.
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- **Scrolling:** Scroll through long history and verify that media items are pre-loaded and don't show "blank" placeholders.
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- **Media Types:** Verify that GIFs play correctly, video thumbnails show up, and SVGs (if any) are rendered.
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- **Network Resilience:** Ensure the app handles slow network gracefully with placeholders (if pre-fetching is still in progress).
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- Verify that SVGs and GIFs still load correctly in the Login and Profile pages.
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- Monitor logcat for any `ImageLoader` initialization logs to ensure only one instance is created.
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