package com.videoapp.tv

import android.os.Bundle
import android.os.Handler
import android.os.Looper
import android.view.View
import android.webkit.WebView
import android.webkit.WebViewClient
import android.widget.Button
import android.widget.ImageButton
import android.widget.LinearLayout
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.PlaySource
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 controlPanel: View
    private lateinit var sourceList: LinearLayout
    private lateinit var episodeList: 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 sources: List<PlaySource> = emptyList()
    private var currentSourceIndex = 0
    private var currentEpisode: Episode? = null

    private val hideHandler = Handler(Looper.getMainLooper())
    private val hideRunnable = Runnable { hideControls() }
    private var controlsVisible = true

    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)
        controlPanel = findViewById(R.id.control_panel)
        sourceList = findViewById(R.id.source_list)
        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") ?: ""

        btnClose.setOnClickListener { finish() }

        initExoPlayer()
        loadSources(detailUrl)
        setupTouchListeners()
    }

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

    private fun loadSources(detailUrl: String) {
        showLoading(true)
        val config = configRepo.getConfig()

        lifecycleScope.launch {
            try {
                sources = videoExtractor.extractVideos(detailUrl, config)

                if (sources.isNotEmpty()) {
                    buildSourceUI()
                    selectSource(0)
                    resetAutoHide()
                } else {
                    tryPlayDirectly(detailUrl, config)
                }
            } catch (e: Exception) {
                showError("加载失败: ${e.message}")
                showLoading(false)
            }
        }
    }

    private fun buildSourceUI() {
        sourceList.removeAllViews()
        sources.forEachIndexed { index, source ->
            val btn = Button(this).apply {
                text = source.name
                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 {
                    selectSource(index)
                    resetAutoHide()
                }
            }
            sourceList.addView(btn)
        }
    }

    private fun selectSource(index: Int) {
        if (index !in sources.indices) return
        currentSourceIndex = index

        // Highlight selected source
        for (i in 0 until sourceList.childCount) {
            sourceList.getChildAt(i).isSelected = (i == index)
        }

        // Build episode list for this source
        val source = sources[index]
        buildEpisodeUI(source.episodes)

        // Auto-play first episode
        if (source.episodes.isNotEmpty()) {
            playEpisode(source.episodes.first())
        }
    }

    private fun buildEpisodeUI(eps: List<Episode>) {
        episodeList.removeAllViews()
        eps.forEach { ep ->
            val btn = Button(this).apply {
                text = ep.title
                setBackgroundResource(R.drawable.episode_selector)
                setTextColor(ContextCompat.getColor(this@PlayerActivity, R.color.text_primary))
                textSize = 12f
                minWidth = 0
                setPadding(14, 6, 14, 6)
                isFocusable = true
                isFocusableInTouchMode = true
                setOnClickListener {
                    highlightEpisode(it)
                    playEpisode(ep)
                    resetAutoHide()
                }
            }
            episodeList.addView(btn)
        }
    }

    private fun playEpisode(ep: Episode) {
        currentEpisode = ep
        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) {
                controlPanel.visibility = View.GONE
                playWithExoPlayer(directUrl)
            } else if (iframeUrl != null) {
                controlPanel.visibility = View.GONE
                playWithWebView(iframeUrl)
            } else {
                controlPanel.visibility = View.GONE
                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() {
        val listener = View.OnClickListener { toggleControls() }
        playerView.setOnClickListener(listener)
        playerWebView.setOnClickListener(listener)
    }

    private fun toggleControls() {
        if (controlsVisible) {
            hideControls()
        } else {
            showControls()
            resetAutoHide()
        }
    }

    private fun showControls() {
        controlsVisible = true
        btnClose.visibility = View.VISIBLE
        controlPanel.visibility = View.VISIBLE
    }

    private fun hideControls() {
        controlsVisible = false
        btnClose.visibility = View.GONE
        controlPanel.visibility = View.GONE
    }

    private fun resetAutoHide() {
        hideHandler.removeCallbacks(hideRunnable)
        if (!controlsVisible) {
            showControls()
        }
        hideHandler.postDelayed(hideRunnable, 4000)
    }

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

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