package sushi.hardcore.droidfs.file_viewers

import android.os.Bundle
import androidx.core.view.WindowInsetsCompat
import androidx.core.view.WindowInsetsControllerCompat
import sushi.hardcore.droidfs.BaseActivity
import sushi.hardcore.droidfs.ConstValues
import sushi.hardcore.droidfs.GocryptfsVolume
import sushi.hardcore.droidfs.R
import sushi.hardcore.droidfs.content_providers.RestrictedFileProvider
import sushi.hardcore.droidfs.explorers.ExplorerElement
import sushi.hardcore.droidfs.util.PathUtils
import sushi.hardcore.droidfs.widgets.ColoredAlertDialogBuilder

abstract class FileViewerActivity: BaseActivity() {
    protected lateinit var gocryptfsVolume: GocryptfsVolume
    protected lateinit var filePath: String
    private lateinit var originalParentPath: String
    private lateinit var windowInsetsController: WindowInsetsControllerCompat
    private var windowTypeMask = 0
    private var isFinishingIntentionally = false
    private var usf_keep_open = false
    private var foldersFirst = true
    private var wasMapped = false
    protected val mappedPlaylist = mutableListOf<ExplorerElement>()
    protected var currentPlaylistIndex = -1

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        filePath = intent.getStringExtra("path")!!
        originalParentPath = PathUtils.getParentPath(filePath)
        val sessionID = intent.getIntExtra("sessionID", -1)
        gocryptfsVolume = GocryptfsVolume(sessionID)
        usf_keep_open = sharedPrefs.getBoolean("usf_keep_open", false)
        foldersFirst = sharedPrefs.getBoolean("folders_first", true)
        windowInsetsController = WindowInsetsControllerCompat(window, window.decorView)
        windowInsetsController.addOnControllableInsetsChangedListener { _, typeMask ->
            windowTypeMask = typeMask
        }
        hideSystemUi()
        viewFile()
    }

    open fun hideSystemUi(){
        windowInsetsController.hide(WindowInsetsCompat.Type.statusBars())
    }

    abstract fun getFileType(): String
    abstract fun viewFile()

    override fun onUserInteraction() {
        super.onUserInteraction()
        if (windowTypeMask and WindowInsetsCompat.Type.statusBars() == 0) {
            hideSystemUi()
        }
    }

    protected fun loadWholeFile(path: String): ByteArray? {
        val fileSize = gocryptfsVolume.getSize(path)
        if (fileSize >= 0){
            try {
                val fileBuff = ByteArray(fileSize.toInt())
                var success = false
                val handleID = gocryptfsVolume.openReadMode(path)
                if (handleID != -1) {
                    var offset: Long = 0
                    val ioBuffer = ByteArray(GocryptfsVolume.DefaultBS)
                    var length: Int
                    while (gocryptfsVolume.readFile(handleID, offset, ioBuffer).also { length = it } > 0){
                        System.arraycopy(ioBuffer, 0, fileBuff, offset.toInt(), length)
                        offset += length.toLong()
                    }
                    gocryptfsVolume.closeFile(handleID)
                    success = offset == fileBuff.size.toLong()
                }
                if (success){
                    return fileBuff
                } else {
                    ColoredAlertDialogBuilder(this)
                        .setTitle(R.string.error)
                        .setMessage(R.string.read_file_failed)
                        .setCancelable(false)
                        .setPositiveButton(R.string.ok) { _, _ -> goBackToExplorer() }
                        .show()
                }
            } catch (e: OutOfMemoryError){
                ColoredAlertDialogBuilder(this)
                    .setTitle(R.string.error)
                    .setMessage(R.string.outofmemoryerror_msg)
                    .setCancelable(false)
                    .setPositiveButton(R.string.ok) { _, _ -> goBackToExplorer() }
                    .show()
            }

        } else {
            ColoredAlertDialogBuilder(this)
                .setTitle(R.string.error)
                .setMessage(R.string.get_size_failed)
                .setCancelable(false)
                .setPositiveButton(R.string.ok) { _, _ -> goBackToExplorer() }
                .show()
        }
        return null
    }

    protected fun createPlaylist() {
        if (!wasMapped){
            for (e in gocryptfsVolume.recursiveMapFiles(originalParentPath)) {
                if (e.isRegularFile) {
                    if (ConstValues.isExtensionType(getFileType(), e.name) || filePath == e.fullPath) {
                        mappedPlaylist.add(e)
                    }
                }
            }
            val sortOrder = intent.getStringExtra("sortOrder") ?: "name"
            ExplorerElement.sortBy(sortOrder, foldersFirst, mappedPlaylist)
            //find current index
            for ((i, e) in mappedPlaylist.withIndex()){
                if (filePath == e.fullPath){
                    currentPlaylistIndex = i
                    break
                }
            }
            wasMapped = true
        }
    }

    protected fun playlistNext(forward: Boolean) {
        createPlaylist()
        currentPlaylistIndex = if (forward) {
            (currentPlaylistIndex+1)%mappedPlaylist.size
        } else {
            var x = (currentPlaylistIndex-1)%mappedPlaylist.size
            if (x < 0) {
                x += mappedPlaylist.size
            }
            x
        }
        filePath = mappedPlaylist[currentPlaylistIndex].fullPath
    }

    protected fun refreshPlaylist() {
        mappedPlaylist.clear()
        wasMapped = false
        createPlaylist()
    }

    protected fun goBackToExplorer() {
        isFinishingIntentionally = true
        finish()
    }

    override fun onDestroy() {
        super.onDestroy()
        if (!isFinishingIntentionally) {
            gocryptfsVolume.close()
            RestrictedFileProvider.wipeAll(this)
        }
    }

    override fun onPause() {
        super.onPause()
        if (!usf_keep_open) {
            finish()
        }
    }

    override fun onBackPressed() {
        super.onBackPressed()
        isFinishingIntentionally = true
    }
}