package chat.rocket.android.chatroom.adapter

import android.Manifest
import android.app.Activity
import android.graphics.Color
import android.graphics.Typeface
import android.media.MediaScannerConnection
import android.net.Uri
import android.os.Environment
import android.support.design.widget.AppBarLayout
import android.support.v7.widget.Toolbar
import android.text.TextUtils
import android.util.TypedValue
import android.view.ContextThemeWrapper
import android.view.Gravity
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import android.widget.Toast
import androidx.core.view.setPadding
import chat.rocket.android.R
import chat.rocket.android.chatroom.viewmodel.ImageAttachmentViewModel
import chat.rocket.android.helper.AndroidPermissionsHelper
import chat.rocket.android.widget.emoji.EmojiReactionListener
import com.facebook.binaryresource.FileBinaryResource
import com.facebook.cache.common.CacheKey
import com.facebook.drawee.backends.pipeline.Fresco
import com.facebook.imageformat.ImageFormatChecker
import com.facebook.imagepipeline.cache.DefaultCacheKeyFactory
import com.facebook.imagepipeline.core.ImagePipelineFactory
import com.facebook.imagepipeline.request.ImageRequest
import com.facebook.imagepipeline.request.ImageRequestBuilder
import com.stfalcon.frescoimageviewer.ImageViewer
import kotlinx.android.synthetic.main.message_attachment.view.*
import timber.log.Timber
import java.io.File


class ImageAttachmentViewHolder(itemView: View,
                                listener: ActionsListener,
                                reactionListener: EmojiReactionListener? = null)
    : BaseViewHolder<ImageAttachmentViewModel>(itemView, listener, reactionListener) {

    private var cacheKey: CacheKey? = null

    init {
        with(itemView) {
            setupActionMenu(attachment_container)
            setupActionMenu(image_attachment)
        }
    }

    override fun bindViews(data: ImageAttachmentViewModel) {
        with(itemView) {
            val controller = Fresco.newDraweeControllerBuilder().apply {
                setUri(data.attachmentUrl)
                autoPlayAnimations = true
                oldController = image_attachment.controller
            }.build()
            image_attachment.controller = controller
            file_name.text = data.attachmentTitle
            image_attachment.setOnClickListener { view ->
                // TODO - implement a proper image viewer with a proper Transition
                // TODO - We should definitely write our own ImageViewer
                var imageViewer: ImageViewer? = null
                val request = ImageRequestBuilder.newBuilderWithSource(Uri.parse(data.attachmentUrl))
                    .setLowestPermittedRequestLevel(ImageRequest.RequestLevel.DISK_CACHE)
                    .build()

                cacheKey = DefaultCacheKeyFactory.getInstance()
                    .getEncodedCacheKey(request, null)
                val pad = context.resources
                    .getDimensionPixelSize(R.dimen.viewer_toolbar_padding)
                val lparams = AppBarLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT)
                val toolbar = Toolbar(context).also {
                    it.inflateMenu(R.menu.image_actions)
                    it.overflowIcon?.setTint(Color.WHITE)
                    it.setOnMenuItemClickListener {
                        return@setOnMenuItemClickListener when (it.itemId) {
                            R.id.action_save_image -> saveImage()
                            else -> super.onMenuItemClick(it)
                        }
                    }

                    val titleSize = context.resources
                        .getDimensionPixelSize(R.dimen.viewer_toolbar_title)
                    val titleTextView = TextView(context).also {
                        it.text = data.attachmentTitle
                        it.setTextColor(Color.WHITE)
                        it.setTextSize(TypedValue.COMPLEX_UNIT_PX, titleSize.toFloat())
                        it.ellipsize = TextUtils.TruncateAt.END
                        it.setSingleLine()
                        it.typeface = Typeface.DEFAULT_BOLD
                        it.setPadding(pad)
                    }

                    val backArrowView = ImageView(context).also {
                        it.setImageResource(R.drawable.ic_arrow_back_white_24dp)
                        it.setOnClickListener { imageViewer?.onDismiss() }
                        it.setPadding(0, pad ,pad, pad)
                    }

                    val layoutParams = AppBarLayout.LayoutParams(
                        AppBarLayout.LayoutParams.WRAP_CONTENT,
                        AppBarLayout.LayoutParams.WRAP_CONTENT
                    )

                    it.addView(backArrowView, layoutParams)
                    it.addView(titleTextView, layoutParams)
                }

                val appBarLayout = AppBarLayout(context).also {
                    it.layoutParams = lparams
                    it.setBackgroundColor(Color.BLACK)
                    it.addView(toolbar, AppBarLayout.LayoutParams(
                        AppBarLayout.LayoutParams.MATCH_PARENT,
                        ViewGroup.LayoutParams.WRAP_CONTENT
                    ))
                }

                val builder = ImageViewer.createPipelineDraweeControllerBuilder()
                    .setImageRequest(request)
                    .setAutoPlayAnimations(true)
                imageViewer = ImageViewer.Builder(view.context, listOf(data.attachmentUrl))
                    .setOverlayView(appBarLayout)
                    .setStartPosition(0)
                    .hideStatusBar(false)
                    .setCustomDraweeControllerBuilder(builder)
                    .show()
            }
        }
    }

    private fun saveImage(): Boolean {
        if (!canWriteToExternalStorage()) {
            checkWritingPermission()
            return false
        }
        if (ImagePipelineFactory.getInstance().mainFileCache.hasKey(cacheKey)) {
            val context = itemView.context
            val resource = ImagePipelineFactory.getInstance().mainFileCache.getResource(cacheKey)
            val cachedFile = (resource as FileBinaryResource).file
            val imageFormat = ImageFormatChecker.getImageFormat(resource.openStream())
            val imageDir = "${Environment.DIRECTORY_PICTURES}/Rocket.Chat Images/"
            val imagePath = Environment.getExternalStoragePublicDirectory(imageDir)
            val imageFile = File(imagePath, "${cachedFile.nameWithoutExtension}.${imageFormat.fileExtension}")
            imagePath.mkdirs()
            imageFile.createNewFile()
            try {
                cachedFile.copyTo(imageFile, true)
                MediaScannerConnection.scanFile(context, arrayOf(imageFile.absolutePath), null) { path, uri ->
                    Timber.i("Scanned $path:")
                    Timber.i("-> uri=$uri")
                }
            } catch (ex: Exception) {
                Timber.e(ex)
                val message = context.getString(R.string.msg_image_saved_failed)
                Toast.makeText(context, message, Toast.LENGTH_SHORT).show()
            } finally {
                val message = context.getString(R.string.msg_image_saved_successfully)
                Toast.makeText(context, message, Toast.LENGTH_SHORT).show()
            }
        }
        return true
    }

    private fun canWriteToExternalStorage(): Boolean {
        return AndroidPermissionsHelper.checkPermission(itemView.context, Manifest.permission.WRITE_EXTERNAL_STORAGE)
    }

    private fun checkWritingPermission() {
        val context = itemView.context
        if (context is ContextThemeWrapper && context.baseContext is Activity) {
            val activity = context.baseContext as Activity
            AndroidPermissionsHelper.requestPermission(activity,
                Manifest.permission.WRITE_EXTERNAL_STORAGE,
                AndroidPermissionsHelper.WRITE_EXTERNAL_STORAGE_CODE)
        }
    }
}