"use client"

// Vennprofil-side (ADR-036 fase 2, 2026-07-28) -- svar på at det tidligere
// ikke fantes NOEN vei til å gå inn på en venns profil og følge en runde
// live, kun selve tilgangskontrollen. Viser navn/avatar/hjemmeklubb/HCP
// (samme lavsensitive felt-sett som personsøket, GET /people/{id}) og en
// liste over personens runder som SPØRREREN har lov til å se
// (GET /public/people/{id}/rounds -- backend filtrerer allerede på
// visibility_mode/venne-kategorisering, denne siden viser bare det den
// får). Bevisst uten venneskap-administrasjon (send/fjern venn) -- det
// hører hjemme i /my-friends, denne siden er en ren visning, nåbar for
// enhver synlig person, ikke bare venner (en offentlig runde er synlig
// for alle, også fremmede/anonyme).

import { useEffect, useState } from "react"
import Link from "next/link"
import { ArrowLeft, ChevronRight, MapPin, Radio } from "lucide-react"
import { cn } from "@/lib/utils"

type ApiPerson = {
  id: string
  first_name: string
  last_name: string
  avatar_url: string | null
  home_club: string | null
  handicap_index: number | null
}

type ApiPersonRound = {
  id: string
  name: string | null
  course_name_snapshot: string
  played_at: string
  completed_at: string | null
  play_format: string
}

const FORMAT_LABELS: Record<string, string> = {
  stroke: "Slagspill",
  stableford: "Stableford",
  match: "Match",
  skins: "Skins",
  fourball: "Fourball",
  foursome: "Foursome",
  greensome: "Greensome",
  scramble_2: "Scramble (2)",
  scramble_4: "Scramble (4)",
}

const dateFormatter = new Intl.DateTimeFormat("no-NO", { day: "numeric", month: "long", year: "numeric" })

function initials(name: string) {
  const parts = name.trim().split(/\s+/)
  const first = parts[0]?.[0] ?? ""
  const last = parts.length > 1 ? parts[parts.length - 1][0] : ""
  return (first + last).toUpperCase()
}

function Avatar({ name, url, size = "large" }: { name: string; url: string | null; size?: "large" | "small" }) {
  const dim = size === "large" ? "size-16 text-xl" : "size-10 text-sm"
  if (url) {
    // eslint-disable-next-line @next/next/no-img-element
    return <img src={url} alt="" className={cn(dim, "shrink-0 rounded-full object-cover")} />
  }
  return (
    <span
      aria-hidden="true"
      className={cn(dim, "flex shrink-0 items-center justify-center rounded-full bg-muted font-bold text-foreground")}
    >
      {initials(name)}
    </span>
  )
}

function RoundRow({ round }: { round: ApiPersonRound }) {
  const ongoing = round.completed_at === null
  return (
    <Link
      href={`/watch/${round.id}`}
      className="flex items-center gap-3 rounded-2xl border border-border bg-card p-4 shadow-md shadow-black/8 transition-colors hover:border-primary/50 hover:bg-accent/30"
    >
      <div className="flex min-w-0 flex-1 flex-col gap-0.5">
        <span className="flex items-center gap-2">
          <span className="truncate text-base font-bold text-foreground">
            {round.name?.trim() || round.course_name_snapshot}
          </span>
          {ongoing && (
            <span className="flex shrink-0 items-center gap-1 rounded-full bg-primary px-2 py-0.5 text-xs font-bold text-primary-foreground">
              <Radio aria-hidden="true" className="size-3" />
              Pågår nå
            </span>
          )}
        </span>
        <span className="truncate text-sm text-muted-foreground">
          {round.name?.trim() ? `${round.course_name_snapshot} · ` : ""}
          {FORMAT_LABELS[round.play_format] ?? round.play_format} · {dateFormatter.format(new Date(round.played_at))}
        </span>
      </div>
      <ChevronRight aria-hidden="true" className="size-5 shrink-0 text-muted-foreground" />
    </Link>
  )
}

export function FriendProfile({ userId }: { userId: string }) {
  const [person, setPerson] = useState<ApiPerson | null>(null)
  const [rounds, setRounds] = useState<ApiPersonRound[] | null>(null)
  const [viewerId, setViewerId] = useState<string | null>(null)
  const [notFound, setNotFound] = useState(false)

  useEffect(() => {
    let cancelled = false
    fetch("/auth/me", { credentials: "include" })
      .then((res) => (res.ok ? res.json() : null))
      .then((data: { id: string } | null) => {
        if (!cancelled && data) setViewerId(data.id)
      })
      .catch(() => {})
    return () => {
      cancelled = true
    }
  }, [])

  useEffect(() => {
    let cancelled = false
    async function load() {
      const [personRes, roundsRes] = await Promise.all([
        fetch(`/people/${userId}`, { credentials: "include" }),
        fetch(`/public/people/${userId}/rounds`, { credentials: "include" }),
      ])
      if (personRes.status === 404) {
        if (!cancelled) setNotFound(true)
        return
      }
      if (!personRes.ok || !roundsRes.ok) return
      const personData: ApiPerson = await personRes.json()
      const roundsData: ApiPersonRound[] = await roundsRes.json()
      if (!cancelled) {
        setPerson(personData)
        setRounds(roundsData)
      }
    }
    void load()
    return () => {
      cancelled = true
    }
  }, [userId])

  if (notFound) {
    return (
      <div className="flex min-h-dvh flex-col items-center justify-center gap-4 bg-background px-5 text-center">
        <p className="text-base font-medium text-destructive">Fant ikke denne brukeren.</p>
        <Link href="/my-friends" className="text-base font-semibold text-primary underline underline-offset-2">
          Tilbake til venner
        </Link>
      </div>
    )
  }

  if (!person || !rounds) {
    return (
      <div className="flex min-h-dvh flex-col items-center justify-center bg-background">
        <div aria-hidden="true" className="size-10 animate-spin rounded-full border-4 border-primary/20 border-t-primary" />
      </div>
    )
  }

  const name = `${person.first_name} ${person.last_name}`.trim()
  const isSelf = viewerId !== null && viewerId === userId
  const ongoing = rounds.filter((r) => r.completed_at === null)
  const finished = rounds.filter((r) => r.completed_at !== null)

  return (
    <div className="min-h-dvh bg-background">
      <header className="sticky top-0 z-10 border-b border-border bg-background/95 backdrop-blur">
        <div className="mx-auto flex min-h-14 max-w-xl items-center gap-2 px-4 py-2">
          <Link
            href="/my-friends"
            className="flex min-h-11 items-center gap-1.5 rounded-xl pr-3 text-base font-bold text-foreground transition-colors hover:text-primary"
          >
            <ArrowLeft aria-hidden="true" className="size-6" />
            Profil
          </Link>
        </div>
      </header>

      <main className="mx-auto flex max-w-xl flex-col gap-4 px-4 py-5 pb-16">
        <div className="flex items-center gap-4 rounded-3xl border border-border bg-card p-4 shadow-md shadow-black/8">
          <Avatar name={name} url={person.avatar_url} />
          <div className="flex min-w-0 flex-col gap-0.5">
            <span className="truncate text-xl font-extrabold tracking-tight text-foreground">{name}</span>
            {person.home_club && (
              <span className="flex items-center gap-1 truncate text-sm font-semibold text-muted-foreground">
                <MapPin aria-hidden="true" className="size-3.5 shrink-0" />
                {person.home_club}
              </span>
            )}
            {person.handicap_index !== null && (
              <span className="text-sm font-semibold text-muted-foreground">HCP {person.handicap_index.toFixed(1)}</span>
            )}
          </div>
        </div>

        {isSelf && (
          <p className="rounded-2xl border border-dashed border-border bg-card p-4 text-sm text-muted-foreground">
            Dette er din egen profil. Gå til{" "}
            <Link href="/my-rounds" className="font-semibold text-primary underline underline-offset-2">
              Egne runder
            </Link>{" "}
            for å se alle rundene dine, inkludert de private.
          </p>
        )}

        {ongoing.length > 0 && (
          <div className="flex flex-col gap-2">
            <h2 className="text-base font-bold text-foreground">Pågår nå</h2>
            <div className="flex flex-col gap-2">
              {ongoing.map((r) => (
                <RoundRow key={r.id} round={r} />
              ))}
            </div>
          </div>
        )}

        <div className="flex flex-col gap-2">
          <h2 className="text-base font-bold text-foreground">Tidligere runder</h2>
          {finished.length === 0 ? (
            <p className="rounded-2xl border border-dashed border-border bg-card p-4 text-sm text-muted-foreground">
              {rounds.length === 0
                ? "Ingen runder du har tilgang til å se ennå."
                : "Ingen fullførte runder du har tilgang til å se ennå."}
            </p>
          ) : (
            <div className="flex flex-col gap-2">
              {finished.map((r) => (
                <RoundRow key={r.id} round={r} />
              ))}
            </div>
          )}
        </div>
      </main>
    </div>
  )
}