LibreTube/app/src/main/java/com/github/libretube/util/DownloadHelper.kt

package com.github.libretube.util

import android.content.Context
import android.os.Build
import com.github.libretube.obj.DownloadedFile
import java.io.File

object DownloadHelper {
    const val VIDEO_DIR = "video"
    const val AUDIO_DIR = "audio"
    const val METADATA_DIR = "metadata"
    const val THUMBNAIL_DIR = "thumbnail"

    private fun getOfflineStorageDir(context: Context): File {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) return context.filesDir

        return try {
            context.getExternalFilesDir(null)!!
        } catch (e: Exception) {
            context.filesDir
        }
    }

    fun getDownloadDir(context: Context, path: String): File {
        return File(
            getOfflineStorageDir(context),
            path
        ).apply {
            if (!this.exists()) this.mkdirs()
        }
    }

    private fun File.toDownloadedFile(): DownloadedFile {
        return DownloadedFile(
            name = this.name,
            size = this.length()
        )
    }

    fun getDownloadedFiles(context: Context): MutableList<DownloadedFile> {
        val videoFiles = getDownloadDir(context, VIDEO_DIR).listFiles().orEmpty()
        val audioFiles = getDownloadDir(context, AUDIO_DIR).listFiles().orEmpty().toMutableList()

        val files = mutableListOf<DownloadedFile>()

        videoFiles.forEach {
            audioFiles.removeIf { audioFile -> audioFile.name == it.name }
            files.add(it.toDownloadedFile())
        }

        audioFiles.forEach {
            files.add(it.toDownloadedFile())
        }

        return files
    }
}