import * as React from 'react'
import { useCallback, useEffect, useRef, useState } from 'react'
import { useTranslation } from 'react-i18next'
import styles from './VideoPlayer.module.css'

type VideoPlayerProps = {
  src?: string // Keep backward compatibility
  srcs?: string[] // Support multiple sources
}

const PlayIcon = () => (
  <svg aria-hidden="true" width="20" height="20" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
    <path d="M8 5V19L19 12L8 5Z" fill="currentColor" />
  </svg>
)

const PauseIcon = () => (
  <svg aria-hidden="true" width="20" height="20" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
    <path d="M6 19H10V5H6V19ZM14 5V19H18V5H14Z" fill="currentColor" />
  </svg>
)

const MuteIcon = () => (
  <svg aria-hidden="true" width="20" height="20" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
    <path d="M3 9V15H7L12 20V4L7 9H3ZM16.5 12C16.5 10.23 15.48 8.71 14 7.97V16.02C15.48 15.29 16.5 13.77 16.5 12ZM14 3.23V5.29C16.89 6.15 19 8.83 19 12C19 15.17 16.89 17.85 14 18.71V20.77C18.01 19.86 21 16.28 21 12C21 7.72 18.01 4.14 14 3.23Z" fill="currentColor" />
  </svg>
)

const UnmuteIcon = () => (
  <svg aria-hidden="true" width="20" height="20" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
    <path d="M4.34 2.93L2.93 4.34L7.29 8.7L7 9H3V15H7L12 20V13.41L16.18 17.59C15.69 17.96 15.16 18.27 14.58 18.5V20.58C15.94 20.22 17.15 19.56 18.13 18.67L19.66 20.2L21.07 18.79L4.34 2.93ZM10 15.17L7.83 13H5V11H7.83L10 8.83V15.17ZM19 12C19 12.82 18.85 13.61 18.59 14.34L20.12 15.87C20.68 14.7 21 13.39 21 12C21 7.72 18.01 4.14 14 3.23V5.29C16.89 6.15 19 8.83 19 12ZM12 4L10.12 5.88L12 7.76V4ZM16.5 12C16.5 10.23 15.48 8.71 14 7.97V10.18L16.45 12.63C16.48 12.43 16.5 12.22 16.5 12Z" fill="currentColor" />
  </svg>
)

const FullscreenIcon = () => (
  <svg aria-hidden="true" width="20" height="20" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
    <path d="M7 14H5V19H10V17H7V14ZM5 10H7V7H10V5H5V10ZM17 17H14V19H19V14H17V17ZM14 5V7H17V10H19V5H14Z" fill="currentColor" />
  </svg>
)

const VideoPlayer: React.FC<VideoPlayerProps> = ({ src, srcs }) => {
  const { t } = useTranslation()
  const [isPlaying, setIsPlaying] = useState(false)
  const [currentTime, setCurrentTime] = useState(0)
  const [duration, setDuration] = useState(0)
  const [isMuted, setIsMuted] = useState(false)
  const [volume, setVolume] = useState(1)
  const [isDragging, setIsDragging] = useState(false)
  const [isControlsVisible, setIsControlsVisible] = useState(true)
  const [hoverTime, setHoverTime] = useState<number | null>(null)
  const videoRef = useRef<HTMLVideoElement>(null)
  const progressRef = useRef<HTMLDivElement>(null)
  const volumeRef = useRef<HTMLDivElement>(null)
  const controlsTimeoutRef = useRef<NodeJS.Timeout | null>(null)
  const [isSmallSize, setIsSmallSize] = useState(false)
  const containerRef = useRef<HTMLDivElement>(null)
  const playPauseLabel = t(isPlaying ? 'operation.pause' : 'operation.play', { ns: 'common' })
  const toggleMuteLabel = t('operation.toggleMute', { ns: 'common' })
  const toggleFullscreenLabel = t('operation.toggleFullscreen', { ns: 'common' })

  useEffect(() => {
    const video = videoRef.current
    /* v8 ignore next 2 -- video element is expected post-mount; null guard protects against lifecycle timing during mount/unmount. @preserve */
    if (!video)
      return

    const setVideoData = () => {
      setDuration(video.duration)
      setVolume(video.volume)
    }

    const setVideoTime = () => {
      setCurrentTime(video.currentTime)
    }

    const handleEnded = () => {
      setIsPlaying(false)
    }

    video.addEventListener('loadedmetadata', setVideoData)
    video.addEventListener('timeupdate', setVideoTime)
    video.addEventListener('ended', handleEnded)

    return () => {
      video.removeEventListener('loadedmetadata', setVideoData)
      video.removeEventListener('timeupdate', setVideoTime)
      video.removeEventListener('ended', handleEnded)
    }
  }, [src, srcs])

  useEffect(() => {
    return () => {
      if (controlsTimeoutRef.current)
        clearTimeout(controlsTimeoutRef.current)
    }
  }, [])

  const showControls = useCallback(() => {
    setIsControlsVisible(true)
    if (controlsTimeoutRef.current)
      clearTimeout(controlsTimeoutRef.current)

    controlsTimeoutRef.current = setTimeout(() => setIsControlsVisible(false), 3000)
  }, [])

  const togglePlayPause = useCallback(() => {
    const video = videoRef.current
    /* v8 ignore next -- click handler can race with unmount in tests/runtime; guard prevents calling methods on a detached video node. @preserve */
    if (video) {
      if (isPlaying)
        video.pause()
      else video.play().catch(error => console.error('Error playing video:', error))
      setIsPlaying(!isPlaying)
    }
  }, [isPlaying])

  const toggleMute = useCallback(() => {
    const video = videoRef.current
    /* v8 ignore next -- defensive null-check for ref lifecycle edges before mutating media properties. @preserve */
    if (video) {
      const newMutedState = !video.muted
      video.muted = newMutedState
      setIsMuted(newMutedState)
      setVolume(newMutedState ? 0 : (video.volume > 0 ? video.volume : 1))
      video.volume = newMutedState ? 0 : (video.volume > 0 ? video.volume : 1)
    }
  }, [])

  const toggleFullscreen = useCallback(() => {
    const video = videoRef.current
    /* v8 ignore next -- defensive null-check so fullscreen calls are skipped if video ref is detached. @preserve */
    if (video) {
      if (document.fullscreenElement)
        document.exitFullscreen()
      else video.requestFullscreen()
    }
  }, [])

  const formatTime = (time: number) => {
    const minutes = Math.floor(time / 60)
    const seconds = Math.floor(time % 60)
    return `${minutes.toString().padStart(2, '0')}:${seconds.toString().padStart(2, '0')}`
  }

  const updateVideoProgress = useCallback((clientX: number, updateTime = false) => {
    const progressBar = progressRef.current
    const video = videoRef.current
    /* v8 ignore next -- progress callbacks may fire while refs are not yet attached or already torn down; guard avoids invalid DOM access. @preserve */
    if (progressBar && video) {
      const rect = progressBar.getBoundingClientRect()
      const pos = (clientX - rect.left) / rect.width
      const newTime = pos * video.duration
      if (newTime >= 0 && newTime <= video.duration) {
        setHoverTime(newTime)
        if (isDragging || updateTime)
          video.currentTime = newTime
      }
    }
  }, [isDragging])

  const handleMouseMove = useCallback((e: React.MouseEvent<HTMLDivElement>) => {
    updateVideoProgress(e.clientX)
  }, [updateVideoProgress])

  const handleMouseLeave = useCallback(() => {
    if (!isDragging)
      setHoverTime(null)
  }, [isDragging])

  const handleProgressClick = useCallback((e: React.MouseEvent<HTMLDivElement>) => {
    e.preventDefault()
    updateVideoProgress(e.clientX, true)
  }, [updateVideoProgress])

  const handleMouseDown = useCallback((e: React.MouseEvent<HTMLDivElement>) => {
    e.preventDefault()
    setIsDragging(true)
    updateVideoProgress(e.clientX, true)
  }, [updateVideoProgress])

  useEffect(() => {
    const handleGlobalMouseMove = (e: MouseEvent) => {
      /* v8 ignore next -- global mousemove listener remains registered briefly; skip updates once dragging has ended. @preserve */
      if (isDragging)
        updateVideoProgress(e.clientX)
    }

    const handleGlobalMouseUp = () => {
      setIsDragging(false)
      setHoverTime(null)
    }

    if (isDragging) {
      document.addEventListener('mousemove', handleGlobalMouseMove)
      document.addEventListener('mouseup', handleGlobalMouseUp)
    }

    return () => {
      document.removeEventListener('mousemove', handleGlobalMouseMove)
      document.removeEventListener('mouseup', handleGlobalMouseUp)
    }
  }, [isDragging, updateVideoProgress])

  const checkSize = useCallback(() => {
    /* v8 ignore next 2 -- container ref may be null before first paint or after unmount while resize events are in flight. @preserve */
    if (containerRef.current)
      setIsSmallSize(containerRef.current.offsetWidth < 400)
  }, [])

  useEffect(() => {
    checkSize()
    window.addEventListener('resize', checkSize)
    return () => window.removeEventListener('resize', checkSize)
  }, [checkSize])

  const handleVolumeChange = useCallback((e: React.MouseEvent<HTMLDivElement>) => {
    const volumeBar = volumeRef.current
    const video = videoRef.current
    /* v8 ignore next -- defensive check for ref availability during drag/click lifecycle transitions. @preserve */
    if (volumeBar && video) {
      const rect = volumeBar.getBoundingClientRect()
      const newVolume = (e.clientX - rect.left) / rect.width
      const clampedVolume = Math.max(0, Math.min(1, newVolume))
      video.volume = clampedVolume
      setVolume(clampedVolume)
      setIsMuted(clampedVolume === 0)
    }
  }, [])

  return (
    <div ref={containerRef} className={styles.videoPlayer} onMouseMove={showControls} onMouseEnter={showControls} data-testid="video-player-container">
      <video ref={videoRef} src={src} className={styles.video} data-testid="video-element">
        {/* If srcs array is provided, render multiple source elements */}
        {srcs && srcs.map((srcUrl, index) => (
          <source key={index} src={srcUrl} />
        ))}
      </video>
      <div className={`${styles.controls} ${isControlsVisible ? styles.visible : styles.hidden} ${isSmallSize ? styles.smallSize : ''}`} data-testid="video-controls" data-is-visible={isControlsVisible}>
        <div className={styles.overlay}>
          <div className={styles.progressBarContainer}>
            <div
              ref={progressRef}
              className={styles.progressBar}
              onClick={handleProgressClick}
              onMouseMove={handleMouseMove}
              onMouseLeave={handleMouseLeave}
              onMouseDown={handleMouseDown}
              data-testid="video-progress-bar"
            >
              <div className={styles.progress} style={{ width: `${(currentTime / duration) * 100}%` }} />
              {hoverTime !== null && (
                <div
                  className={styles.hoverTimeIndicator}
                  style={{ left: `${(hoverTime / duration) * 100}%` }}
                  data-testid="video-hover-time"
                >
                  {formatTime(hoverTime)}
                </div>
              )}
            </div>
          </div>
          <div className={styles.controlsContent}>
            <div className={styles.leftControls}>
              <button type="button" aria-label={playPauseLabel} className={styles.playPauseButton} onClick={togglePlayPause}>
                {isPlaying ? <PauseIcon /> : <PlayIcon />}
              </button>
              {!isSmallSize && (
                <span className={styles.time} data-testid="video-time-display">
                  {formatTime(currentTime)}
                  {' '}
                  /
                  {' '}
                  {formatTime(duration)}
                </span>
              )}
            </div>
            <div className={styles.rightControls}>
              <button type="button" aria-label={toggleMuteLabel} className={styles.muteButton} onClick={toggleMute}>
                {isMuted ? <UnmuteIcon /> : <MuteIcon />}
              </button>
              {!isSmallSize && (
                <div className={styles.volumeControl}>
                  <div
                    ref={volumeRef}
                    className={styles.volumeSlider}
                    onClick={handleVolumeChange}
                    onMouseDown={(e) => {
                      handleVolumeChange(e)
                      const handleMouseMove = (e: MouseEvent) => handleVolumeChange(e as unknown as React.MouseEvent<HTMLDivElement>)
                      const handleMouseUp = () => {
                        document.removeEventListener('mousemove', handleMouseMove)
                        document.removeEventListener('mouseup', handleMouseUp)
                      }
                      document.addEventListener('mousemove', handleMouseMove)
                      document.addEventListener('mouseup', handleMouseUp)
                    }}
                    data-testid="video-volume-slider"
                  >
                    <div className={styles.volumeLevel} style={{ width: `${volume * 100}%` }} />
                  </div>
                </div>
              )}
              <button type="button" aria-label={toggleFullscreenLabel} className={styles.fullscreenButton} onClick={toggleFullscreen}>
                <FullscreenIcon />
              </button>
            </div>
          </div>
        </div>
      </div>
    </div>
  )
}

export default VideoPlayer
