import { Metadata } from "next"
import { notFound } from "next/navigation"
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs"
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card"
import { Badge } from "@/components/ui/badge"
import { Separator } from "@/components/ui/separator"
import Link from "next/link"

interface ArtistPageProps {
    params: {
        slug: string
    }
}

async function getArtist(slug: string) {
    const res = await fetch(`${process.env.INTERNAL_API_URL}/artists/${slug}`, {
        next: { revalidate: 60 },
    })

    if (!res.ok) {
        if (res.status === 404) return null
        throw new Error("Failed to fetch artist")
    }

    return res.json()
}

export async function generateMetadata({ params }: ArtistPageProps): Promise<Metadata> {
    const data = await getArtist(params.slug)
    if (!data) return { title: "Artist Not Found" }

    return {
        title: `${data.artist.name} | Elmeg`,
        description: data.artist.bio || `Artist profile for ${data.artist.name} on Elmeg.`,
    }
}

export default async function ArtistPage({ params }: ArtistPageProps) {
    const data = await getArtist(params.slug)
    if (!data) return notFound()

    const { artist, covers, guest_appearances } = data

    return (
        <div className="container py-8 space-y-8">
            {/* Header */}
            <div className="flex flex-col gap-4">
                <div className="flex items-center gap-4">
                    {artist.image_url ? (
                        <img
                            src={artist.image_url}
                            alt={artist.name}
                            className="w-24 h-24 rounded-full object-cover border-2 border-primary/20"
                        />
                    ) : (
                        <div className="w-24 h-24 rounded-full bg-accent flex items-center justify-center text-3xl font-bold text-muted-foreground">
                            {artist.name[0]}
                        </div>
                    )}
                    <div>
                        <h1 className="text-4xl font-bold tracking-tight">{artist.name}</h1>
                        {artist.instrument && (
                            <p className="text-muted-foreground">{artist.instrument}</p>
                        )}
                    </div>
                </div>

                {artist.bio && (
                    <p className="max-w-3xl text-lg text-muted-foreground leading-relaxed">
                        {artist.bio}
                    </p>
                )}
            </div>

            <Separator />

            <Tabs defaultValue="covers" className="space-y-6">
                <TabsList>
                    <TabsTrigger value="covers">
                        Covers
                        <Badge variant="secondary" className="ml-2">{covers.length}</Badge>
                    </TabsTrigger>
                    <TabsTrigger value="guests">
                        Guest Appearances
                        <Badge variant="secondary" className="ml-2">{guest_appearances.length}</Badge>
                    </TabsTrigger>
                </TabsList>

                <TabsContent value="covers" className="space-y-4">
                    <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-3">
                        {covers.map((song: any) => (
                            <Link
                                key={song.id}
                                href={`/songs/${song.slug}`}
                                className="block group"
                            >
                                <Card className="h-full transition-colors group-hover:bg-accent/50">
                                    <CardHeader>
                                        <CardTitle className="group-hover:text-primary transition-colors">
                                            {song.title}
                                        </CardTitle>
                                    </CardHeader>
                                    <CardContent>
                                        <p className="text-sm text-muted-foreground">
                                            Covered by Goose
                                        </p>
                                    </CardContent>
                                </Card>
                            </Link>
                        ))}
                        {covers.length === 0 && (
                            <div className="col-span-full py-12 text-center text-muted-foreground">
                                No known covers by this artist.
                            </div>
                        )}
                    </div>
                </TabsContent>

                <TabsContent value="guests" className="space-y-4">
                    <div className="border rounded-lg">
                        <div className="divide-y">
                            {guest_appearances.map((perf: any, i: number) => (
                                <div key={i} className="p-4 flex flex-col sm:flex-row sm:items-center justify-between gap-4 hover:bg-accent/50 transition-colors">
                                    <div>
                                        <Link
                                            href={`/shows/${perf.show_slug}`}
                                            className="font-semibold hover:underline"
                                        >
                                            {new Date(perf.date).toLocaleDateString(undefined, {
                                                year: 'numeric',
                                                month: 'long',
                                                day: 'numeric'
                                            })}
                                        </Link>
                                        <p className="text-sm text-muted-foreground">
                                            {perf.venue} • {perf.city}
                                        </p>
                                    </div>
                                    <div className="flex items-center gap-2">
                                        <span className="text-sm text-muted-foreground">Sat in on:</span>
                                        <Link
                                            href={`/songs/${perf.song_slug}`}
                                            className="font-medium hover:text-primary transition-colors"
                                        >
                                            {perf.song_title}
                                        </Link>
                                    </div>
                                </div>
                            ))}
                            {guest_appearances.length === 0 && (
                                <div className="p-12 text-center text-muted-foreground">
                                    No recorded guest appearances.
                                </div>
                            )}
                        </div>
                    </div>
                </TabsContent>
            </Tabs>
        </div>
    )
}
