/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.fenix.tabtray

import android.view.View
import android.widget.ImageButton
import android.widget.ImageView
import android.widget.TextView
import androidx.appcompat.widget.AppCompatImageButton
import androidx.core.content.ContextCompat
import mozilla.components.browser.state.state.MediaState
import mozilla.components.browser.tabstray.TabViewHolder
import mozilla.components.browser.tabstray.thumbnail.TabThumbnailView
import mozilla.components.concept.tabstray.Tab
import mozilla.components.concept.tabstray.TabsTray
import mozilla.components.feature.media.ext.pauseIfPlaying
import mozilla.components.feature.media.ext.playIfPaused
import mozilla.components.support.base.observer.Observable
import mozilla.components.support.ktx.kotlin.tryGetHostFromUrl
import org.mozilla.fenix.R
import org.mozilla.fenix.components.metrics.Event
import org.mozilla.fenix.ext.components
import org.mozilla.fenix.ext.increaseTapArea
import org.mozilla.fenix.ext.removeAndDisable
import org.mozilla.fenix.ext.removeTouchDelegate
import org.mozilla.fenix.ext.showAndEnable
import org.mozilla.fenix.ext.toTab
import org.mozilla.fenix.theme.ThemeManager

/**
 * A RecyclerView ViewHolder implementation for "tab" items.
 */
class TabTrayViewHolder(itemView: View) : TabViewHolder(itemView) {
    private val iconView: ImageView? = itemView.findViewById(R.id.mozac_browser_tabstray_icon)
    private val titleView: TextView = itemView.findViewById(R.id.mozac_browser_tabstray_title)
    private val closeView: AppCompatImageButton = itemView.findViewById(R.id.mozac_browser_tabstray_close)
    private val thumbnailView: TabThumbnailView = itemView.findViewById(R.id.mozac_browser_tabstray_thumbnail)
    private val urlView: TextView? = itemView.findViewById(R.id.mozac_browser_tabstray_url)
    private val playPauseButtonView: ImageButton = itemView.findViewById(R.id.play_pause_button)

    override var tab: Tab? = null

    /**
     * Displays the data of the given session and notifies the given observable about events.
     */
    override fun bind(tab: Tab, isSelected: Boolean, observable: Observable<TabsTray.Observer>) {
        this.tab = tab

        // Basic text
        updateTitle(tab)
        updateUrl(tab)
        updateCloseButtonDescription(tab.title)

        // Drawables and theme
        updateBackgroundColor(isSelected)
        thumbnailView.setImageBitmap(tab.thumbnail)
        iconView?.setImageBitmap(tab.icon)

        // Media state
        playPauseButtonView.increaseTapArea(PLAY_PAUSE_BUTTON_EXTRA_DPS)
        val session = itemView.context?.components?.core?.sessionManager?.findSessionById(tab.id)
        with(playPauseButtonView) {
            invalidate()
            when (session?.toTab(itemView.context)?.mediaState) {
                MediaState.State.PAUSED -> {
                    showAndEnable()
                    contentDescription =
                        context.getString(R.string.mozac_feature_media_notification_action_play)
                    setImageDrawable(
                        androidx.appcompat.content.res.AppCompatResources.getDrawable(
                            context,
                            R.drawable.tab_tray_play_with_background
                        )
                    )
                }

                MediaState.State.PLAYING -> {
                    showAndEnable()
                    contentDescription =
                        context.getString(R.string.mozac_feature_media_notification_action_pause)
                    setImageDrawable(
                        androidx.appcompat.content.res.AppCompatResources.getDrawable(
                            context,
                            R.drawable.tab_tray_pause_with_background
                        )
                    )
                }

                MediaState.State.NONE -> {
                    removeTouchDelegate()
                    removeAndDisable()
                }
            }
        }

        playPauseButtonView.setOnClickListener {
            val mState = session?.toTab(itemView.context)?.mediaState
            when (mState) {
                MediaState.State.PLAYING -> {
                    itemView.context.components.analytics.metrics.track(Event.TabMediaPause)
                    itemView.context.components.core.store.state.media.pauseIfPlaying()
                }

                MediaState.State.PAUSED -> {
                    itemView.context.components.analytics.metrics.track(Event.TabMediaPlay)
                    itemView.context.components.core.store.state.media.playIfPaused()
                }

                MediaState.State.NONE -> throw AssertionError(
                    "Play/Pause button clicked without play/pause state."
                )
            }
        }

        itemView.setOnClickListener {
            observable.notifyObservers { onTabSelected(tab) }
        }

        closeView.setOnClickListener {
            observable.notifyObservers { onTabClosed(tab) }
        }
    }

    private fun updateTitle(tab: Tab) {
        val title = if (tab.title.isNotEmpty()) {
            tab.title
        } else {
            tab.url
        }
        titleView.text = title
    }
    private fun updateUrl(tab: Tab) {
        urlView?.text = tab.url.tryGetHostFromUrl()
    }

    private fun updateBackgroundColor(isSelected: Boolean) {
        val itemBackground = if (isSelected) {
            R.attr.tabTrayItemSelectedBackground
        } else {
            R.attr.tabTrayItemBackground
        }
        itemView.setBackgroundColor(
            ContextCompat.getColor(
                itemView.context,
                ThemeManager.resolveAttribute(itemBackground, itemView.context)
            )
        )
    }

    private fun updateCloseButtonDescription(title: String) {
        closeView.contentDescription =
            closeView.context.getString(R.string.close_tab_title, title)
    }

    companion object {
        private const val PLAY_PAUSE_BUTTON_EXTRA_DPS = 24
    }
}