"use client"

// Offentlig "Følg live" for INDIVIDUELLE turneringer (2026-08-21) --
// motstykket til public-live.tsx (Cup-format). Se CHANGELOG.md samme dag
// for hele bakgrunnen (bevisst utsatt siden 2026-08-14, FEATURE_BACKLOG.md
// "Flaggturnering Del B", nå bygget etter grundig todelt analyse).
//
// Visuelt: Claude-skrevet V0-eksport (v0-prompt-public-individual-live.md),
// presentasjonskomponentene under er UENDRET fra eksporten. Denne filen
// bytter ut mock-datalaget med ekte fetching + sanntid.
//
// VIKTIG forenkling fra mock til ekte data: mock-en modellerte hver runde
// som sitt eget, helt separate leaderboard. Den ekte backend-modellen
// (individual_tournaments.py _compute_individual_standings) beregner ETT
// SAMLET, kumulativt turnering-leaderboard -- "i dag"/"thru" gjelder
// alltid gjeldende/siste påbegynte runde, "total" er summen på tvers av
// ALLE spilte runder. Rundevelgeren endrer derfor IKKE selve
// leaderboard-radene (position/thru/i dag/total er alltid de samme,
// uansett hvilken rundefane som er valgt) -- den styrer KUN hvilken
// rundes hull-for-hull-rutenett som lastes når en rad utvides.

import { useEffect, useMemo, useRef, useState } from "react"
import { ArrowLeft, Radio, Check, ChevronDown } from "lucide-react"
import { cn } from "@/lib/utils"
import { Wordmark } from "@/components/wordmark"

/* ------------------------------------------------------------------ *
 * API-typer (matcher app/routers/registration.py sine nye endepunkt) *
 * ------------------------------------------------------------------ */

type RoundStatus = "not_started" | "in_progress" | "completed"

type ApiRound = {
  id: string
  sequence: number
  name: string
  course_name: string
  scheduled_at: string | null
  status: RoundStatus
}

type Tone = "under" | "even" | "over" | null

type ApiRoundCell = { round_number: number; label: string; tone: Tone }

type PlayerStatus = "active" | "dsq" | "rtd" | "dnf" | "dns"

type ApiLeaderboardEntry = {
  tournament_participant_id: string
  player_name: string
  class_id: string | null
  class_name: string | null
  position: string | null
  is_leader: boolean
  today_label: string | null
  thru_label: string | null
  total_label: string | null
  rank: number | null
  cut: boolean
  status: PlayerStatus
  handicap_index: number | null
  rounds: ApiRoundCell[]
}

type ApiHole = { hole_number: number; par: number; gross_strokes: number | null }

type ApiTournamentInfo = { name: string; format_type: string; status: string }

/* ------------------------------------------------------------------ *
 * Visningstyper for hull-rutenettet (per runde, hentes lat ved utvidelse)
 * ------------------------------------------------------------------ */

type HoleResult = { holeNumber: number; par: number; toParTone: Tone; label: string }

function toneOf(strokesOverPar: number): Tone {
  return strokesOverPar < 0 ? "under" : strokesOverPar > 0 ? "over" : "even"
}

function holesFromApi(holes: ApiHole[]): HoleResult[] {
  return holes.map((h) => {
    if (h.gross_strokes == null) return { holeNumber: h.hole_number, par: h.par, toParTone: null, label: "" }
    return {
      holeNumber: h.hole_number,
      par: h.par,
      toParTone: toneOf(h.gross_strokes - h.par),
      label: String(h.gross_strokes),
    }
  })
}

/* ------------------------------------------------------------------ *
 * Delt golfscore-visuelt språk -- UENDRET fra V0-eksporten.           *
 * under = sirkel · over = avrundet firkant · even = ren tekst.        *
 * emphasis = fylt (leder); ellers tint + kant.                        *
 * ------------------------------------------------------------------ */

function ScoreShape({
  label,
  tone,
  emphasis = false,
  size = "md",
}: {
  label: string | null
  tone: Tone
  emphasis?: boolean
  size?: "sm" | "md"
}) {
  const dims = size === "sm" ? "min-h-7 min-w-7 px-1 text-xs" : "min-h-10 min-w-10 px-2 text-sm"
  const base = cn("inline-flex items-center justify-center font-bold tabular-nums", dims)

  if (label == null) {
    return (
      <span className={cn(base, "text-muted-foreground")} aria-hidden="true">
        –
      </span>
    )
  }
  if (tone === "even") {
    return (
      <span className={cn(base, "text-foreground")}>
        {label}
        <span className="sr-only"> likt med par</span>
      </span>
    )
  }
  if (tone == null) {
    return <span className={cn(base, "text-muted-foreground")}>{label}</span>
  }

  const under = tone === "under"
  const shape = under ? "rounded-full" : "rounded-[5px]"
  const skin = emphasis
    ? under
      ? "bg-primary text-primary-foreground"
      : "bg-brand-orange text-brand-orange-foreground"
    : under
      ? "border-2 border-primary/35 bg-primary/10 text-primary"
      : "border-2 border-brand-orange/35 bg-brand-orange/10 text-brand-orange"

  return (
    <span className={cn(base, shape, skin)}>
      {label}
      <span className="sr-only">{under ? " under par" : " over par"}</span>
    </span>
  )
}

function RankBadge({ position, isLeader }: { position: string | null; isLeader: boolean }) {
  if (!position) {
    return (
      <span className="inline-flex min-h-8 min-w-9 items-center justify-center rounded-lg bg-muted px-1.5 text-sm font-bold text-muted-foreground">
        –
      </span>
    )
  }
  return (
    <span
      className={cn(
        "inline-flex min-h-8 min-w-9 items-center justify-center rounded-lg px-1.5 text-sm font-extrabold tabular-nums",
        isLeader ? "bg-primary text-primary-foreground" : "bg-muted text-foreground",
      )}
    >
      {position}
    </span>
  )
}

function StatusPill({ label }: { label: string }) {
  return (
    <span className="inline-flex min-h-8 items-center justify-center rounded-md border border-dashed border-border bg-muted/40 px-2.5 text-xs font-bold uppercase tracking-wide text-muted-foreground">
      {label}
    </span>
  )
}

function RoundStatusBadge({ status }: { status: RoundStatus }) {
  if (status === "in_progress") {
    return (
      <span className="inline-flex items-center gap-1.5 self-start rounded-full bg-primary px-2.5 py-1 text-xs font-bold text-primary-foreground">
        <Radio aria-hidden="true" className="size-3.5 animate-pulse" />
        Pågår nå
      </span>
    )
  }
  if (status === "completed") {
    return (
      <span className="inline-flex items-center gap-1.5 self-start text-xs font-semibold text-muted-foreground">
        <Check aria-hidden="true" className="size-3.5" />
        Fullført
      </span>
    )
  }
  return <span className="self-start text-xs font-semibold text-muted-foreground">Ikke startet</span>
}

const STATUS_LABEL: Record<Exclude<PlayerStatus, "active">, string> = {
  dsq: "DSQ",
  rtd: "RTD",
  dnf: "DNF",
  dns: "DNS",
}

/* ------------------------------------------------------------------ *
 * Utvidbart hull-for-hull-rutenett                                    *
 * ------------------------------------------------------------------ */

function HoleNine({ holes, label }: { holes: HoleResult[]; label: string }) {
  const parSum = holes.reduce((s, h) => s + h.par, 0)
  const strokeSum = holes.reduce((s, h) => s + (h.label ? Number(h.label) : 0), 0)
  return (
    <div className="overflow-hidden rounded-xl border border-border">
      <div className="grid grid-cols-[2rem_repeat(9,minmax(0,1fr))_2.4rem] items-center bg-muted/60 text-center text-[11px] font-semibold text-muted-foreground">
        <div className="py-1">{label}</div>
        {holes.map((h) => (
          <div key={h.holeNumber} className="py-1">
            {h.holeNumber}
          </div>
        ))}
        <div className="py-1">Sum</div>
      </div>
      <div className="grid grid-cols-[2rem_repeat(9,minmax(0,1fr))_2.4rem] items-center border-t border-border text-center text-[11px] text-muted-foreground">
        <div className="py-1 font-semibold">Par</div>
        {holes.map((h) => (
          <div key={h.holeNumber} className="py-1 tabular-nums">
            {h.par}
          </div>
        ))}
        <div className="py-1 font-semibold tabular-nums">{parSum}</div>
      </div>
      <div className="grid grid-cols-[2rem_repeat(9,minmax(0,1fr))_2.4rem] items-center justify-items-center border-t border-border py-1 text-center">
        <div className="text-[11px] font-semibold text-foreground">Deg</div>
        {holes.map((h) =>
          h.label ? (
            <ScoreShape key={h.holeNumber} label={h.label} tone={h.toParTone} size="sm" />
          ) : (
            <span key={h.holeNumber} className="text-xs text-muted-foreground" aria-hidden="true">
              –
            </span>
          ),
        )}
        <div className="text-xs font-bold tabular-nums text-foreground">{strokeSum || "–"}</div>
      </div>
    </div>
  )
}

function HoleGrid({ holes }: { holes: HoleResult[] }) {
  if (holes.length === 0) {
    return <p className="px-3 pb-3 text-sm text-muted-foreground">Ingen hull registrert for denne runden ennå.</p>
  }
  return (
    <div className="flex flex-col gap-2 px-3 pb-3">
      <HoleNine holes={holes.slice(0, 9)} label="Ut" />
      {holes.length > 9 && <HoleNine holes={holes.slice(9)} label="Inn" />}
    </div>
  )
}

/* ------------------------------------------------------------------ *
 * Leaderboard-rad -- henter hull-for-hull LAT, for VALGT runde,      *
 * kun når raden faktisk utvides.                                     *
 * ------------------------------------------------------------------ */

function LeaderboardRow({
  entry,
  organizationlessBase,
  roundId,
}: {
  entry: ApiLeaderboardEntry
  organizationlessBase: string
  roundId: string | null
}) {
  const [open, setOpen] = useState(false)
  const [holes, setHoles] = useState<HoleResult[] | null>(null)
  const [loadingHoles, setLoadingHoles] = useState(false)
  const panelId = `holes-${entry.tournament_participant_id}`
  const isStatus = entry.status !== "active"

  // Rundevalg endret seg mens raden var åpen -- kast cachet data, hent på nytt.
  useEffect(() => {
    setHoles(null)
  }, [roundId])

  async function toggle() {
    const next = !open
    setOpen(next)
    if (next && roundId && holes === null) {
      setLoadingHoles(true)
      try {
        const res = await fetch(
          `${organizationlessBase}/rounds/${roundId}/participants/${entry.tournament_participant_id}/holes`,
          { credentials: "include" },
        )
        if (res.ok) {
          const data: ApiHole[] = await res.json()
          setHoles(holesFromApi(data))
        }
      } finally {
        setLoadingHoles(false)
      }
    }
  }

  const rowInner = (
    <>
      <RankBadge position={entry.position} isLeader={entry.is_leader} />
      <span className="flex min-w-0 flex-1 flex-col">
        <span className="truncate text-[15px] font-bold text-foreground">{entry.player_name}</span>
        <span className="truncate text-xs text-muted-foreground">
          {entry.handicap_index != null && `HCP ${entry.handicap_index.toFixed(1).replace(".", ",")}`}
          {entry.handicap_index != null && entry.class_name ? " · " : ""}
          {entry.class_name}
        </span>
      </span>

      <span className="flex flex-col items-center gap-0.5">
        <span className="text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">Thru</span>
        <span className="text-sm font-bold tabular-nums text-foreground">{entry.thru_label ?? "-"}</span>
      </span>

      <span className="flex flex-col items-center gap-0.5">
        <span className="text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">I dag</span>
        {isStatus ? (
          <span className="text-sm text-muted-foreground" aria-hidden="true">
            –
          </span>
        ) : (
          <ScoreShape
            label={entry.today_label}
            tone={entry.today_label?.startsWith("-") || entry.today_label?.startsWith("−") ? "under" : entry.today_label?.startsWith("+") ? "over" : entry.today_label === "E" ? "even" : null}
          />
        )}
      </span>

      <span className="flex flex-col items-center gap-0.5">
        <span className="text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">Total</span>
        {isStatus || entry.cut ? (
          <StatusPill label={entry.cut ? "Kuttet" : STATUS_LABEL[entry.status as Exclude<PlayerStatus, "active">]} />
        ) : (
          <ScoreShape
            label={entry.total_label}
            tone={entry.total_label?.startsWith("-") || entry.total_label?.startsWith("−") ? "under" : entry.total_label?.startsWith("+") ? "over" : entry.total_label === "E" ? "even" : null}
            emphasis={entry.is_leader}
          />
        )}
      </span>

      <ChevronDown
        aria-hidden="true"
        className={cn(
          "size-5 shrink-0 text-muted-foreground transition-transform duration-200",
          roundId ? (open ? "rotate-180" : "") : "invisible",
        )}
      />
    </>
  )

  if (!roundId) {
    return <li className="flex items-center gap-2.5 px-3 py-3 sm:px-4">{rowInner}</li>
  }

  return (
    <li>
      <button
        type="button"
        onClick={() => void toggle()}
        aria-expanded={open}
        aria-controls={panelId}
        className="flex w-full items-center gap-2.5 px-3 py-3 text-left transition-colors hover:bg-muted/40 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-inset sm:px-4"
      >
        {rowInner}
        <span className="sr-only">{open ? "Skjul hull for hull" : "Vis hull for hull"}</span>
      </button>
      <div
        id={panelId}
        className={cn(
          "grid transition-all duration-300 ease-out",
          open ? "grid-rows-[1fr] opacity-100" : "grid-rows-[0fr] opacity-0",
        )}
      >
        <div className="overflow-hidden">
          <div className={cn(!open && "invisible")} aria-hidden={!open}>
            {loadingHoles ? (
              <p className="px-3 pb-3 text-sm text-muted-foreground">Laster hull …</p>
            ) : (
              <HoleGrid holes={holes ?? []} />
            )}
          </div>
        </div>
      </div>
    </li>
  )
}

/* ------------------------------------------------------------------ *
 * Side                                                                *
 * ------------------------------------------------------------------ */

function pickDefaultRound(rounds: ApiRound[]): string | null {
  const live = rounds.find((r) => r.status === "in_progress")
  if (live) return live.id
  const completed = [...rounds].reverse().find((r) => r.status === "completed")
  if (completed) return completed.id
  return rounds[0]?.id ?? null
}

function rankKey(e: ApiLeaderboardEntry): number {
  if (e.position) return Number.parseInt(e.position.replace(/\D/g, ""), 10) || 999
  return 1000
}

export function PublicIndividualLive({ tournamentId, code }: { tournamentId: string; code?: string }) {
  const codeParam = code ? `?code=${encodeURIComponent(code)}` : ""
  const base = `/public/tournaments/${tournamentId}`

  const [tournament, setTournament] = useState<ApiTournamentInfo | null>(null)
  const [rounds, setRounds] = useState<ApiRound[]>([])
  const [entries, setEntries] = useState<ApiLeaderboardEntry[]>([])
  const [selectedRoundId, setSelectedRoundId] = useState<string | null>(null)
  const [classFilter, setClassFilter] = useState<string>("all")
  const [loading, setLoading] = useState(true)

  async function loadAll(isFirst: boolean) {
    const [tRes, rRes, lRes] = await Promise.all([
      isFirst ? fetch(`${base}${codeParam}`, { credentials: "include" }) : Promise.resolve(null),
      fetch(`${base}/rounds${codeParam}`, { credentials: "include" }),
      fetch(`${base}/individual-leaderboard${codeParam}`, { credentials: "include" }),
    ])
    if (tRes?.ok) {
      const data: ApiTournamentInfo = await tRes.json()
      setTournament(data)
    }
    if (rRes.ok) {
      const data: ApiRound[] = await rRes.json()
      setRounds(data)
      if (isFirst) setSelectedRoundId(pickDefaultRound(data))
    }
    if (lRes.ok) {
      const data: ApiLeaderboardEntry[] = await lRes.json()
      setEntries(data)
    }
  }

  useEffect(() => {
    let cancelled = false
    loadAll(true).finally(() => {
      if (!cancelled) setLoading(false)
    })
    return () => {
      cancelled = true
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [tournamentId])

  // Sanntid -- SAMME WebSocket-kanal og "noe endret, hent på nytt"-mønster
  // som public-live.tsx (Cup-format) allerede bruker, ADR-027.
  const isFirstRefresh = useRef(true)
  useEffect(() => {
    const proto = window.location.protocol === "https:" ? "wss" : "ws"
    const ws = new WebSocket(
      `${proto}://${window.location.host}/ws/public/tournaments/${tournamentId}/live${codeParam}`,
    )
    ws.onmessage = () => {
      if (isFirstRefresh.current) {
        isFirstRefresh.current = false
        return
      }
      void loadAll(false)
    }
    return () => ws.close()
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [tournamentId])

  const classes = useMemo(
    () => Array.from(new Set(entries.map((e) => e.class_name).filter((c): c is string => !!c))),
    [entries],
  )

  const visible = useMemo(() => {
    const filtered = classFilter === "all" ? entries : entries.filter((e) => e.class_name === classFilter)
    return [...filtered].sort((a, b) => rankKey(a) - rankKey(b))
  }, [entries, classFilter])

  const advancing = visible.filter((e) => e.status === "active" && !e.cut)
  const belowCut = visible.filter((e) => e.cut || e.status !== "active")
  const hasCut = belowCut.length > 0

  const isFinished = tournament?.status === "completed" || tournament?.status === "archived"

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

  return (
    <div className="min-h-dvh bg-background text-foreground">
      <header className="sticky top-0 z-20 border-b border-border bg-background/85 backdrop-blur supports-[backdrop-filter]:bg-background/70">
        <div className="mx-auto flex max-w-3xl items-center gap-3 px-4 py-3">
          <a
            href={`/t/${tournamentId}${codeParam}`}
            aria-label="Tilbake til turneringen"
            className="flex size-10 shrink-0 items-center justify-center rounded-xl border border-border bg-card text-foreground transition-colors hover:bg-muted focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
          >
            <ArrowLeft aria-hidden="true" className="size-5" />
          </a>

          <div className="flex min-w-0 flex-1 flex-col">
            <span className="flex items-center gap-1.5">
              <span
                aria-hidden="true"
                className={cn("size-2 rounded-full", isFinished ? "bg-muted-foreground" : "bg-primary animate-pulse")}
              />
              <span className="text-[11px] font-bold uppercase tracking-[0.15em] text-muted-foreground">
                {isFinished ? "Avsluttet" : "Følg live"}
              </span>
            </span>
            <h1 className="truncate text-lg font-extrabold leading-tight text-foreground text-balance">
              {tournament?.name ?? "Turnering"}
            </h1>
          </div>

          <Wordmark compact />
        </div>
      </header>

      <main className="mx-auto flex max-w-3xl flex-col gap-5 px-4 py-5">
        {rounds.length > 0 && (
          <nav aria-label="Velg runde" className="-mx-4 overflow-x-auto px-4">
            <ul className="flex gap-2.5">
              {rounds.map((r) => {
                const selected = r.id === selectedRoundId
                const date = r.scheduled_at
                  ? new Intl.DateTimeFormat("no-NO", { day: "numeric", month: "long", year: "numeric" }).format(
                      new Date(r.scheduled_at),
                    )
                  : null
                return (
                  <li key={r.id}>
                    <button
                      type="button"
                      onClick={() => setSelectedRoundId(r.id)}
                      aria-pressed={selected}
                      className={cn(
                        "flex min-w-[10.5rem] flex-col gap-1.5 rounded-2xl border p-3 text-left transition-colors",
                        "focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring",
                        selected
                          ? "border-primary bg-primary/5 ring-1 ring-primary"
                          : "border-border bg-card hover:bg-muted/50",
                      )}
                    >
                      <span className="text-sm font-extrabold text-foreground">{r.name}</span>
                      <span className="text-xs text-muted-foreground">
                        {r.course_name}
                        {date ? ` · ${date}` : ""}
                      </span>
                      <RoundStatusBadge status={r.status} />
                    </button>
                  </li>
                )
              })}
            </ul>
          </nav>
        )}

        <section aria-label="Resultatliste" className="flex flex-col gap-3">
          {classes.length > 0 && entries.length > 0 && (
            <div
              role="group"
              aria-label="Filtrer på klasse"
              className="flex flex-wrap gap-1.5 rounded-xl border border-border bg-card p-1"
            >
              {[{ key: "all", label: "Alle" }, ...classes.map((c) => ({ key: c, label: c }))].map((opt) => {
                const active = classFilter === opt.key
                return (
                  <button
                    key={opt.key}
                    type="button"
                    onClick={() => setClassFilter(opt.key)}
                    aria-pressed={active}
                    className={cn(
                      "min-h-9 flex-1 rounded-lg px-3 text-sm font-bold transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring",
                      active ? "bg-primary text-primary-foreground" : "text-muted-foreground hover:bg-muted",
                    )}
                  >
                    {opt.label}
                  </button>
                )
              })}
            </div>
          )}

          {entries.length === 0 ? (
            <div className="rounded-2xl border border-dashed border-border bg-card px-6 py-12 text-center">
              <p className="text-sm font-semibold text-foreground">Ingen resultater ennå</p>
              <p className="mt-1 text-sm text-muted-foreground text-pretty">
                Ingen resultater registrert ennå for denne turneringen.
              </p>
            </div>
          ) : visible.length === 0 ? (
            <div className="rounded-2xl border border-dashed border-border bg-card px-6 py-12 text-center">
              <p className="text-sm text-muted-foreground">Ingen spillere i denne klassen.</p>
            </div>
          ) : (
            <ol className="divide-y divide-border overflow-hidden rounded-2xl border border-border bg-card shadow-md shadow-black/[0.06]">
              {advancing.map((e) => (
                <LeaderboardRow key={e.tournament_participant_id} entry={e} organizationlessBase={base} roundId={selectedRoundId} />
              ))}

              {hasCut && (
                <li aria-hidden="true" className="flex items-center gap-3 bg-muted/50 px-4 py-2">
                  <span className="h-px flex-1 bg-border" />
                  <span className="text-xs font-bold uppercase tracking-wide text-muted-foreground">
                    Cut · {advancing.length} videre
                  </span>
                  <span className="h-px flex-1 bg-border" />
                </li>
              )}

              {belowCut.map((e) => (
                <LeaderboardRow key={e.tournament_participant_id} entry={e} organizationlessBase={base} roundId={selectedRoundId} />
              ))}
            </ol>
          )}

          <div className="flex flex-wrap items-center gap-x-4 gap-y-2 px-1 text-xs text-muted-foreground">
            <span className="flex items-center gap-1.5">
              <span className="flex size-5 items-center justify-center rounded-full border-2 border-primary/35 bg-primary/10 text-[10px] font-bold text-primary">
                −
              </span>
              Under par
            </span>
            <span className="flex items-center gap-1.5">
              <span className="text-[11px] font-bold text-foreground">E</span>
              Par
            </span>
            <span className="flex items-center gap-1.5">
              <span className="flex size-5 items-center justify-center rounded-[4px] border-2 border-brand-orange/35 bg-brand-orange/10 text-[10px] font-bold text-brand-orange">
                +
              </span>
              Over par
            </span>
          </div>
        </section>
      </main>
    </div>
  )
}