ariane/app/src/main/java/oppen/gem/io/bookmarks/RoomBookmarks.kt

package oppen.gem.io.bookmarks

import android.content.Context
import androidx.room.Room
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.launch
import java.net.URI

class RoomBookmarks(applicationContext: Context): BookmarksDatasource {

    private val db: BookmarksDB = Room.databaseBuilder(applicationContext, BookmarksDB::class.java, "tva_bookmarks").build()

    override fun get(onBookmarks: (List<Bookmark>) -> Unit) {
        GlobalScope.launch(Dispatchers.IO){
            val dbBookmarks = db.bookmarksDao().getAll()
            val bookmarks = mutableListOf<Bookmark>()

            dbBookmarks.forEach { bookmarkEntity ->
                bookmarks.add(
                    Bookmark(
                        label = bookmarkEntity.label ?: "Unknown",
                        uri = URI.create(bookmarkEntity.uri),
                        index = bookmarkEntity.uiIndex ?: 0)
                )
            }
            onBookmarks(bookmarks)
        }
    }

    override fun add(bookmark: Bookmark, onAdded: () -> Unit) {
        GlobalScope.launch(Dispatchers.IO){
            val bookmarkEntity = BookmarkEntity(
                label = bookmark.label,
                uri = bookmark.uri.toString(),
                uiIndex = bookmark.index)

            db.bookmarksDao().insertAll(bookmarkEntity)
            onAdded()
        }
    }

    override fun moveUp(bookmark: Bookmark, onMoved: () -> Unit) {
        GlobalScope.launch(Dispatchers.IO){

            //todo - this method is broken:
            val prev = db.bookmarksDao().getBookmark(bookmark.index -1)
            val target = db.bookmarksDao().getBookmark(bookmark.index)

            db.bookmarksDao().update(prev.uid, bookmark.index)
            db.bookmarksDao().update(target.uid, bookmark.index - 1)
            onMoved()
        }
    }

    override fun moveDown(bookmark: Bookmark, onMoved: () -> Unit) {
        GlobalScope.launch(Dispatchers.IO){
            val next = db.bookmarksDao().getBookmark(bookmark.index + 1)
            val target = db.bookmarksDao().getBookmark(bookmark.index)

            db.bookmarksDao().update(next.uid, bookmark.index)
            db.bookmarksDao().update(target.uid, bookmark.index + 1)
            onMoved()
        }
    }

    override fun delete(bookmark: Bookmark, onDelete: () -> Unit) {
        GlobalScope.launch(Dispatchers.IO){
            val entity = db.bookmarksDao().getBookmark(bookmark.index)
            db.bookmarksDao().delete(entity)
            onDelete()
        }
    }
}