'use client'

import { useEffect, useMemo, useState } from 'react'
import { formatDistanceToNow } from 'date-fns'
import { InfoIcon, Trash2 } from 'lucide-react'

import { resolvePodcastAssetUrl } from '@/lib/api/podcasts'
import { EpisodeStatus, PodcastEpisode } from '@/lib/types/podcasts'
import { cn } from '@/lib/utils'
import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
  AlertDialogTrigger,
} from '@/components/ui/alert-dialog'
import { Badge } from '@/components/ui/badge'
import { Button } from '@/components/ui/button'
import { Card, CardContent } from '@/components/ui/card'
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogHeader,
  DialogTitle,
  DialogTrigger,
} from '@/components/ui/dialog'
import { ScrollArea } from '@/components/ui/scroll-area'
import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs'

interface EpisodeCardProps {
  episode: PodcastEpisode
  onDelete: (episodeId: string) => Promise<void> | void
  deleting?: boolean
}

const STATUS_META: Record<
  EpisodeStatus | 'unknown',
  { label: string; className: string }
> = {
  running: {
    label: 'Processing',
    className: 'bg-amber-100 text-amber-800 border-amber-200',
  },
  processing: {
    label: 'Processing',
    className: 'bg-amber-100 text-amber-800 border-amber-200',
  },
  completed: {
    label: 'Completed',
    className: 'bg-emerald-100 text-emerald-800 border-emerald-200',
  },
  failed: {
    label: 'Failed',
    className: 'bg-red-100 text-red-800 border-red-200',
  },
  error: {
    label: 'Failed',
    className: 'bg-red-100 text-red-800 border-red-200',
  },
  pending: {
    label: 'Pending',
    className: 'bg-sky-100 text-sky-800 border-sky-200',
  },
  submitted: {
    label: 'Pending',
    className: 'bg-sky-100 text-sky-800 border-sky-200',
  },
  unknown: {
    label: 'Unknown',
    className: 'bg-muted text-muted-foreground border-transparent',
  },
}

function StatusBadge({ status }: { status?: EpisodeStatus | null }) {
  // Don't show badge for completed episodes
  if (status === 'completed') {
    return null
  }

  const meta = STATUS_META[status ?? 'unknown']
  return (
    <Badge
      variant="outline"
      className={cn('uppercase tracking-wide text-xs', meta.className)}
    >
      {meta.label}
    </Badge>
  )
}

type OutlineSegment = {
  name?: string
  description?: string
  size?: string
}

type OutlineData = {
  segments?: OutlineSegment[]
}

type TranscriptEntry = {
  speaker?: string
  dialogue?: string
}

type TranscriptData = {
  transcript?: TranscriptEntry[]
}

function extractOutlineSegments(outline: unknown): OutlineSegment[] {
  if (outline && typeof outline === 'object' && 'segments' in outline) {
    const data = outline as OutlineData
    if (Array.isArray(data.segments)) {
      return data.segments
    }
  }
  return []
}

function extractTranscriptEntries(transcript: unknown): TranscriptEntry[] {
  if (transcript && typeof transcript === 'object' && 'transcript' in transcript) {
    const data = transcript as TranscriptData
    if (Array.isArray(data.transcript)) {
      return data.transcript
    }
  }
  return []
}

export function EpisodeCard({ episode, onDelete, deleting }: EpisodeCardProps) {
  const [audioSrc, setAudioSrc] = useState<string | undefined>()
  const [audioError, setAudioError] = useState<string | null>(null)
  const [detailsOpen, setDetailsOpen] = useState(false)

  const outlineSegments = useMemo(() => extractOutlineSegments(episode.outline), [episode.outline])
  const transcriptEntries = useMemo(() => extractTranscriptEntries(episode.transcript), [episode.transcript])

  useEffect(() => {
    let revokeUrl: string | undefined
    setAudioError(null)

    // If backend exposed a protected endpoint, fetch it with auth headers
    const loadProtectedAudio = async () => {
      // First resolve the audio URL
      const directAudioUrl = await resolvePodcastAssetUrl(episode.audio_url ?? episode.audio_file)

      if (!directAudioUrl || !episode.audio_url) {
        setAudioSrc(directAudioUrl)
        return
      }

      try {
        let token: string | undefined
        if (typeof window !== 'undefined') {
          const raw = window.localStorage.getItem('auth-storage')
          if (raw) {
            try {
              const parsed = JSON.parse(raw)
              token = parsed?.state?.token
            } catch (error) {
              console.error('Failed to parse auth storage', error)
            }
          }
        }

        const headers: HeadersInit = {}
        if (token) {
          headers.Authorization = `Bearer ${token}`
        }

        const response = await fetch(directAudioUrl, { headers })
        if (!response.ok) {
          throw new Error(`Audio request failed with status ${response.status}`)
        }

        const blob = await response.blob()
        revokeUrl = URL.createObjectURL(blob)
        setAudioSrc(revokeUrl)
      } catch (error) {
        console.error('Unable to load podcast audio', error)
        setAudioError('Audio unavailable')
        setAudioSrc(undefined)
      }
    }

    void loadProtectedAudio()

    return () => {
      if (revokeUrl) {
        URL.revokeObjectURL(revokeUrl)
      }
    }
  }, [episode.audio_url, episode.audio_file])

  const createdLabel = episode.created
    ? formatDistanceToNow(new Date(episode.created), {
        addSuffix: true,
      })
    : null

  const handleDelete = () => {
    void onDelete(episode.id)
  }

  return (
    <Card className="shadow-sm">
      <CardContent className="space-y-4 p-4">
        <div className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
          <div className="space-y-1">
            <div className="flex flex-wrap items-center gap-2">
              <h3 className="text-base font-semibold text-foreground">
                {episode.name}
              </h3>
              <StatusBadge status={episode.job_status} />
            </div>
            <p className="text-xs text-muted-foreground">
              Profile: {episode.episode_profile?.name ?? 'Unknown'}
              {createdLabel ? ` • Created ${createdLabel}` : ''}
            </p>
          </div>
          <div className="flex items-center gap-2">
            <Dialog open={detailsOpen} onOpenChange={setDetailsOpen}>
              <DialogTrigger asChild>
                <Button variant="outline" size="sm">
                  <InfoIcon className="mr-2 h-4 w-4" /> Details
                </Button>
              </DialogTrigger>
              <DialogContent className="w-[min(90vw,720px)] max-h-[85vh] overflow-hidden">
                <DialogHeader>
                  <DialogTitle>{episode.name}</DialogTitle>
                  <DialogDescription>
                    {episode.episode_profile?.name ?? 'Unknown profile'}
                    {createdLabel ? ` • Created ${createdLabel}` : ''}
                  </DialogDescription>
                </DialogHeader>
                <div className="space-y-4 overflow-hidden">
                  {audioSrc ? (
                    <audio controls preload="none" src={audioSrc} className="w-full" />
                  ) : audioError ? (
                    <p className="text-sm text-destructive">{audioError}</p>
                  ) : null}

                  <Tabs defaultValue="summary" className="h-[60vh] flex flex-col">
                    <TabsList className="grid w-full grid-cols-3">
                      <TabsTrigger value="summary">Summary</TabsTrigger>
                      <TabsTrigger value="outline">Outline</TabsTrigger>
                      <TabsTrigger value="transcript">Transcript</TabsTrigger>
                    </TabsList>

                    <TabsContent value="summary" className="flex-1 overflow-hidden">
                      <ScrollArea className="h-full pr-4">
                        <div className="space-y-6">
                          <section className="space-y-2">
                            <h4 className="text-sm font-semibold text-foreground">Episode Profile</h4>
                            <div className="grid gap-2 text-sm md:grid-cols-2">
                              <div>
                                <p className="text-muted-foreground">Outline Model</p>
                                <p>
                                  {episode.episode_profile?.outline_provider ?? '—'} /
                                  {' '}
                                  {episode.episode_profile?.outline_model ?? '—'}
                                </p>
                              </div>
                              <div>
                                <p className="text-muted-foreground">Transcript Model</p>
                                <p>
                                  {episode.episode_profile?.transcript_provider ?? '—'} /
                                  {' '}
                                  {episode.episode_profile?.transcript_model ?? '—'}
                                </p>
                              </div>
                              <div>
                                <p className="text-muted-foreground">Segments</p>
                                <p>{episode.episode_profile?.num_segments ?? '—'}</p>
                              </div>
                            </div>
                            {episode.episode_profile?.default_briefing ? (
                              <div className="rounded border bg-muted/30 p-3 text-xs whitespace-pre-wrap">
                                {episode.episode_profile.default_briefing}
                              </div>
                            ) : null}
                          </section>

                          <section className="space-y-2">
                            <h4 className="text-sm font-semibold text-foreground">Speaker Profile</h4>
                            <p className="text-xs text-muted-foreground">
                              {episode.speaker_profile?.tts_provider ?? '—'} /{' '}
                              {episode.speaker_profile?.tts_model ?? '—'}
                            </p>
                            {episode.speaker_profile?.speakers?.map((speaker, index) => (
                              <div
                                key={`${speaker.name}-${index}`}
                                className="rounded-md border bg-muted/20 p-3 text-xs"
                              >
                                <p className="font-semibold text-foreground">{speaker.name}</p>
                                <p className="text-muted-foreground">Voice ID: {speaker.voice_id}</p>
                                <p className="mt-2 whitespace-pre-wrap text-muted-foreground">
                                  <span className="font-semibold">Backstory:</span> {speaker.backstory}
                                </p>
                                <p className="mt-2 whitespace-pre-wrap text-muted-foreground">
                                  <span className="font-semibold">Personality:</span> {speaker.personality}
                                </p>
                              </div>
                            ))}
                          </section>

                          {episode.briefing ? (
                            <section className="space-y-2">
                              <h4 className="text-sm font-semibold text-foreground">Briefing</h4>
                              <div className="rounded border bg-muted/30 p-3 text-xs whitespace-pre-wrap">
                                {episode.briefing}
                              </div>
                            </section>
                          ) : null}
                        </div>
                      </ScrollArea>
                    </TabsContent>

                    <TabsContent value="outline" className="flex-1 overflow-hidden">
                      <ScrollArea className="h-full pr-4">
                        {outlineSegments.length > 0 ? (
                          <div className="space-y-3">
                            {outlineSegments.map((segment, index) => (
                              <div key={index} className="rounded border bg-muted/20 p-3 text-xs space-y-1">
                                <div className="flex items-center justify-between gap-2">
                                  <p className="font-semibold text-foreground">{segment.name ?? `Segment ${index + 1}`}</p>
                                  {segment.size ? (
                                    <Badge variant="outline" className="text-[10px] uppercase tracking-wide">{segment.size}</Badge>
                                  ) : null}
                                </div>
                                <p className="text-muted-foreground whitespace-pre-wrap">{segment.description ?? 'No description provided.'}</p>
                              </div>
                            ))}
                          </div>
                        ) : (
                          <p className="text-xs text-muted-foreground">No outline available.</p>
                        )}
                      </ScrollArea>
                    </TabsContent>

                    <TabsContent value="transcript" className="flex-1 overflow-hidden">
                      <ScrollArea className="h-full pr-4 space-y-3">
                        {transcriptEntries.length > 0 ? (
                          transcriptEntries.map((entry, index) => (
                            <div key={index} className="rounded border bg-muted/20 p-3 text-xs space-y-1">
                              <p className="font-semibold text-foreground">{entry.speaker ?? 'Speaker'}</p>
                              <p className="text-muted-foreground whitespace-pre-wrap">{entry.dialogue ?? ''}</p>
                            </div>
                          ))
                        ) : (
                          <p className="text-xs text-muted-foreground">No transcript available.</p>
                        )}
                      </ScrollArea>
                    </TabsContent>
                  </Tabs>
                </div>
              </DialogContent>
            </Dialog>
            <AlertDialog>
              <AlertDialogTrigger asChild>
                <Button variant="ghost" size="sm" className="text-destructive">
                  <Trash2 className="mr-2 h-4 w-4" />
                  Delete
                </Button>
              </AlertDialogTrigger>
              <AlertDialogContent>
                <AlertDialogHeader>
                  <AlertDialogTitle>Delete episode?</AlertDialogTitle>
                  <AlertDialogDescription>
                    This will remove “{episode.name}” and its audio file permanently.
                  </AlertDialogDescription>
                </AlertDialogHeader>
                <AlertDialogFooter>
                  <AlertDialogCancel>Cancel</AlertDialogCancel>
                  <AlertDialogAction onClick={handleDelete} disabled={deleting}>
                    {deleting ? 'Deleting…' : 'Delete'}
                  </AlertDialogAction>
                </AlertDialogFooter>
              </AlertDialogContent>
            </AlertDialog>
          </div>
        </div>

        {audioSrc ? (
          <audio controls preload="none" src={audioSrc} className="w-full" />
        ) : audioError ? (
          <p className="text-sm text-destructive">{audioError}</p>
        ) : null}
      </CardContent>
    </Card>
  )
}