package com.videoapp.tv

import android.os.Bundle
import android.view.View
import android.webkit.WebView
import android.webkit.WebViewClient
import android.widget.Button
import android.widget.ImageButton
import androidx.appcompat.app.AppCompatActivity
import androidx.core.content.ContextCompat
import androidx.lifecycle.lifecycleScope
import androidx.media3.common.MediaItem
import androidx.media3.exoplayer.ExoPlayer
import androidx.media3.ui.PlayerView
import com.videoapp.tv.data.ConfigRepository
import com.videoapp.tv.engine.Episode
import com.videoapp.tv.engine.VideoExtractor
import kotlinx.coroutines.launch

class PlayerActivity : AppCompatActivity() {

    private lateinit var playerView: PlayerView
    private lateinit var playerWebView: WebView
    private lateinit var episodePanel: View
    private lateinit var episodeList: android.widget.LinearLayout
    private lateinit var loadingIndicator: View
    private lateinit var errorText: android.widget.TextView
    private lateinit var btnClose: ImageButton

    private var exoPlayer: ExoPlayer? = null
    private val videoExtractor = VideoExtractor()
    private val configRepo by lazy { ConfigRepository(this) }

    private var episodes: List<Episode> = emptyList()
    private var currentEpisodeIndex = 0

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_player)

        playerView = findViewById(R.id.player_view)
        playerWebView = findViewById(R.id.player_webview)
        episodePanel = findViewById(R.id.episode_panel)
        episodeList = findViewById(R.id.episode_list)
        loadingIndicator = findViewById(R.id.loading_indicator)
        errorText = findViewById(R.id.error_text)
        btnClose = findViewById(R.id.btn_close)

        val detailUrl = intent.getStringExtra("detail_url") ?: ""
        val title = intent.getStringExtra("title") ?: ""

        btnClose.setOnClickListener { finish() }

        initExoPlayer()
        loadVideos(detailUrl, title)
        setupTouchListeners()
    }

    private fun initExoPlayer() {
        exoPlayer = ExoPlayer.Builder(this).build().also { player ->
            playerView.player = player
        }
    }

    private fun loadVideos(detailUrl: String, @Suppress("UNUSED_PARAMETER") title: String) {
        showLoading(true)
        val config = configRepo.getConfig()

        lifecycleScope.launch {
            try {
                val videoInfo = videoExtractor.extractVideos(detailUrl, config)
                episodes = videoInfo.episodes

                if (videoInfo.episodes.isNotEmpty()) {
                    buildEpisodeUI(videoInfo.episodes)
                    playEpisode(videoInfo.episodes.first())
                } else {
                    episodePanel.visibility = View.GONE
                    tryPlayDirectly(detailUrl, config)
                }
            } catch (e: Exception) {
                showError("加载视频失败: ${e.message}")
                showLoading(false)
            }
        }
    }

    private fun buildEpisodeUI(eps: List<Episode>) {
        episodeList.removeAllViews()
        episodePanel.visibility = View.VISIBLE

        eps.forEachIndexed { index, ep ->
            val btn = Button(this).apply {
                text = ep.title
                setBackgroundResource(R.drawable.episode_selector)
                setTextColor(ContextCompat.getColor(this@PlayerActivity, R.color.text_primary))
                textSize = 13f
                minWidth = 0
                setPadding(16, 8, 16, 8)
                isFocusable = true
                isFocusableInTouchMode = true
                setOnClickListener {
                    currentEpisodeIndex = index
                    highlightEpisode(it)
                    playEpisode(ep)
                }
            }
            episodeList.addView(btn)
        }
    }

    private fun playEpisode(ep: Episode) {
        showLoading(true)
        val config = configRepo.getConfig()

        lifecycleScope.launch {
            val (directUrl, iframeUrl) = videoExtractor.extractFromPlayPage(ep.playUrl, config)

            if (directUrl != null) {
                playWithExoPlayer(directUrl)
            } else if (iframeUrl != null) {
                playWithWebView(iframeUrl)
            } else {
                playWithWebView(ep.playUrl)
            }
        }
    }

    private fun tryPlayDirectly(detailUrl: String, config: com.videoapp.tv.data.SiteConfig) {
        lifecycleScope.launch {
            val (directUrl, iframeUrl) = videoExtractor.extractFromPlayPage(detailUrl, config)
            if (directUrl != null) {
                playWithExoPlayer(directUrl)
            } else if (iframeUrl != null) {
                playWithWebView(iframeUrl)
            } else {
                playWithWebView(detailUrl)
            }
        }
    }

    private fun playWithExoPlayer(url: String) {
        playerWebView.visibility = View.GONE
        playerView.visibility = View.VISIBLE
        showLoading(false)

        val mediaItem = MediaItem.fromUri(url)
        exoPlayer?.apply {
            setMediaItem(mediaItem)
            prepare()
            playWhenReady = true
        }
    }

    private fun playWithWebView(url: String) {
        playerView.visibility = View.GONE
        playerWebView.visibility = View.VISIBLE
        showLoading(false)

        playerWebView.settings.javaScriptEnabled = true
        playerWebView.settings.domStorageEnabled = true
        playerWebView.settings.mediaPlaybackRequiresUserGesture = false
        playerWebView.webViewClient = object : WebViewClient() {
            override fun onPageFinished(view: WebView, url: String) {
                super.onPageFinished(view, url)
                showLoading(false)
            }
        }
        playerWebView.loadUrl(url)
    }

    private fun highlightEpisode(view: View) {
        for (i in 0 until episodeList.childCount) {
            episodeList.getChildAt(i).isSelected = (episodeList.getChildAt(i) == view)
        }
    }

    private fun showLoading(show: Boolean) {
        loadingIndicator.visibility = if (show) View.VISIBLE else View.GONE
    }

    private fun showError(msg: String) {
        errorText.text = msg
        errorText.visibility = View.VISIBLE
        showLoading(false)
    }

    private fun setupTouchListeners() {
        var panelVisible = true
        playerView.setOnClickListener {
            panelVisible = !panelVisible
            episodePanel.visibility = if (panelVisible) View.VISIBLE else View.GONE
        }
        playerWebView.setOnClickListener {
            panelVisible = !panelVisible
            episodePanel.visibility = if (panelVisible) View.VISIBLE else View.GONE
        }
    }

    override fun onPause() {
        super.onPause()
        exoPlayer?.playWhenReady = false
    }

    override fun onDestroy() {
        super.onDestroy()
        exoPlayer?.release()
        exoPlayer = null
    }
}