import { useState, useEffect, useRef } from 'react'
import { useParams, Link } from 'react-router-dom'
import { useQuery } from '@tanstack/react-query'
import {
  ArrowLeftIcon,
  PlayIcon,
  PauseIcon,
  ForwardIcon,
  BackwardIcon,
} from '@heroicons/react/24/solid'
import clsx from 'clsx'
import { viajesApi } from '@/api'
import { MapContainer } from '@/components/mapa'
import RutaLayer from '@/components/mapa/RutaLayer'
import Card from '@/components/ui/Card'
import Button from '@/components/ui/Button'
import { SkeletonMap } from '@/components/ui/Skeleton'

export default function ViajeReplay() {
  const { id } = useParams<{ id: string }>()
  const [isPlaying, setIsPlaying] = useState(false)
  const [currentIndex, setCurrentIndex] = useState(0)
  const [playbackSpeed, setPlaybackSpeed] = useState(1)
  const intervalRef = useRef<ReturnType<typeof setInterval> | null>(null)

  const { data: replayData, isLoading } = useQuery({
    queryKey: ['viaje-replay', id],
    queryFn: () => viajesApi.getReplayData(id!),
    enabled: !!id,
  })

  const puntos = replayData?.puntos || []
  const viaje = replayData?.viaje

  // Playback control
  useEffect(() => {
    if (isPlaying && puntos.length > 0) {
      intervalRef.current = setInterval(() => {
        setCurrentIndex((prev) => {
          if (prev >= puntos.length - 1) {
            setIsPlaying(false)
            return prev
          }
          return prev + 1
        })
      }, 1000 / playbackSpeed)
    }

    return () => {
      if (intervalRef.current) {
        clearInterval(intervalRef.current)
      }
    }
  }, [isPlaying, playbackSpeed, puntos.length])

  const handlePlayPause = () => {
    setIsPlaying(!isPlaying)
  }

  const handleSpeedChange = () => {
    const speeds = [1, 2, 4, 8]
    const currentSpeedIndex = speeds.indexOf(playbackSpeed)
    const nextIndex = (currentSpeedIndex + 1) % speeds.length
    setPlaybackSpeed(speeds[nextIndex])
  }

  const handleSeek = (e: React.ChangeEvent<HTMLInputElement>) => {
    setCurrentIndex(parseInt(e.target.value))
  }

  const handleStepBack = () => {
    setCurrentIndex(Math.max(0, currentIndex - 10))
  }

  const handleStepForward = () => {
    setCurrentIndex(Math.min(puntos.length - 1, currentIndex + 10))
  }

  // Current point
  const currentPoint = puntos[currentIndex]

  if (isLoading) {
    return (
      <div className="space-y-6">
        <div className="h-8 bg-slate-800 rounded w-48 animate-shimmer" />
        <SkeletonMap />
      </div>
    )
  }

  if (!viaje) {
    return (
      <div className="text-center py-12">
        <p className="text-slate-500">Viaje no encontrado</p>
        <Link to="/viajes" className="text-accent-400 hover:text-accent-300 mt-2 inline-block">
          Volver a viajes
        </Link>
      </div>
    )
  }

  return (
    <div className="space-y-4">
      {/* Header */}
      <div className="flex items-center gap-4">
        <Link
          to="/viajes"
          className="p-2 text-slate-400 hover:text-white hover:bg-slate-800 rounded-lg transition-colors"
        >
          <ArrowLeftIcon className="w-5 h-5" />
        </Link>
        <div>
          <h1 className="text-xl font-bold text-white">
            Replay de viaje - {viaje.vehiculo?.nombre}
          </h1>
          <p className="text-sm text-slate-500">
            {viaje.vehiculo?.placa} | {new Date(viaje.inicio).toLocaleString()}
          </p>
        </div>
      </div>

      {/* Map and controls */}
      <div className="grid grid-cols-1 lg:grid-cols-4 gap-4">
        {/* Map */}
        <div className="lg:col-span-3 h-[500px] rounded-xl overflow-hidden">
          <MapContainer showControls={false}>
            {puntos.length > 0 && (
              <RutaLayer
                puntos={puntos.slice(0, currentIndex + 1)}
                showStartEnd
                animated={isPlaying}
              />
            )}
          </MapContainer>
        </div>

        {/* Info panel */}
        <div className="space-y-4">
          {/* Current stats */}
          <Card padding="md">
            <h3 className="text-sm font-medium text-slate-400 mb-3">Posicion actual</h3>
            {currentPoint ? (
              <div className="space-y-2 text-sm">
                <div className="flex justify-between">
                  <span className="text-slate-500">Hora</span>
                  <span className="text-white">
                    {currentPoint.timestamp
                      ? new Date(currentPoint.timestamp).toLocaleTimeString()
                      : '--'}
                  </span>
                </div>
                <div className="flex justify-between">
                  <span className="text-slate-500">Velocidad</span>
                  <span className="text-white">{currentPoint.velocidad || 0} km/h</span>
                </div>
                <div className="flex justify-between">
                  <span className="text-slate-500">Coordenadas</span>
                  <span className="text-white text-xs font-mono">
                    {currentPoint.lat.toFixed(5)}, {currentPoint.lng.toFixed(5)}
                  </span>
                </div>
              </div>
            ) : (
              <p className="text-slate-500">Sin datos</p>
            )}
          </Card>

          {/* Trip summary */}
          <Card padding="md">
            <h3 className="text-sm font-medium text-slate-400 mb-3">Resumen del viaje</h3>
            <div className="space-y-2 text-sm">
              <div className="flex justify-between">
                <span className="text-slate-500">Distancia</span>
                <span className="text-white">{viaje.distancia?.toFixed(1) || 0} km</span>
              </div>
              <div className="flex justify-between">
                <span className="text-slate-500">Duracion</span>
                <span className="text-white">{viaje.duracion || 0} min</span>
              </div>
              <div className="flex justify-between">
                <span className="text-slate-500">Vel. promedio</span>
                <span className="text-white">{viaje.velocidadPromedio?.toFixed(0) || 0} km/h</span>
              </div>
              <div className="flex justify-between">
                <span className="text-slate-500">Vel. maxima</span>
                <span className="text-white">{viaje.velocidadMaxima?.toFixed(0) || 0} km/h</span>
              </div>
            </div>
          </Card>
        </div>
      </div>

      {/* Playback controls */}
      <Card padding="md">
        <div className="flex items-center gap-4">
          {/* Play controls */}
          <div className="flex items-center gap-2">
            <Button
              variant="ghost"
              size="sm"
              onClick={handleStepBack}
              disabled={currentIndex === 0}
            >
              <BackwardIcon className="w-5 h-5" />
            </Button>
            <Button
              variant="primary"
              onClick={handlePlayPause}
              leftIcon={
                isPlaying ? (
                  <PauseIcon className="w-5 h-5" />
                ) : (
                  <PlayIcon className="w-5 h-5" />
                )
              }
            >
              {isPlaying ? 'Pausar' : 'Reproducir'}
            </Button>
            <Button
              variant="ghost"
              size="sm"
              onClick={handleStepForward}
              disabled={currentIndex >= puntos.length - 1}
            >
              <ForwardIcon className="w-5 h-5" />
            </Button>
          </div>

          {/* Speed */}
          <button
            onClick={handleSpeedChange}
            className="px-3 py-1.5 text-sm font-medium text-slate-400 hover:text-white bg-slate-800 rounded-lg"
          >
            {playbackSpeed}x
          </button>

          {/* Timeline */}
          <div className="flex-1 flex items-center gap-3">
            <input
              type="range"
              min={0}
              max={puntos.length - 1}
              value={currentIndex}
              onChange={handleSeek}
              className="flex-1 h-2 bg-slate-700 rounded-full appearance-none cursor-pointer"
            />
            <span className="text-sm text-slate-500 whitespace-nowrap">
              {currentIndex + 1} / {puntos.length}
            </span>
          </div>
        </div>
      </Card>
    </div>
  )
}