"use client"

// Aggregert statistikk på tvers av "Egne runder" (ADR-033), lenket fra
// dashbordets "Statistikk"-seksjon. Egen backend-aggregering
// (GET /rounds/stats/summary) -- ikke bare klientside-utledning av
// round-stats.tsx sin logikk, siden putt/18-hull-regelen (padding av
// uspilte hull til 2 putter, KUN for dette tallet) og "forrige periode"-
// vinduet må regnes over ALLE fullførte runder samlet, ikke én om gangen.
//
// Visuell versjon 2 (2026-07-28): brukeren delte et referansebilde av en
// konkurrent-app sin statistikkskjerm (donuter med sentertall, kompass-
// diagram for miss-retning) og ba om noe tilsvarende -- håndkodet direkte
// (ingen V0-credits igjen), verifisert med ekte skjermbilder via Chrome
// DevTools MCP i stedet for kun typesjekk, se CLAUDE.md. Inspirert av
// referansen, ikke kopiert: egne farger/ikonografi, ingen flyt-diagram for
// scrambling/sand save (ville antydet en forgrening dataene ikke har -- det
// er to uavhengige prosenter, ikke en beslutningstre), ingen trendlinje
// ennå (for lite rundehistorikk til å være meningsfullt, se CLAUDE.md).

import type React from "react"
import { useEffect, useState } from "react"
import { useRouter } from "next/navigation"
import Link from "next/link"
import { ArrowDown, ArrowLeft, ArrowRight, ArrowUp, BarChart3, Flag, TrendingDown, TrendingUp, Waves, Wind } from "lucide-react"

type ApiRoundSeriesPoint = { played_at: string; score_to_par: number }

type ApiStatsSummary = {
  rounds_completed: number
  avg_score_to_par: number | null
  round_series: ApiRoundSeriesPoint[]
  avg_putts_per_18: number | null
  putts_tracked_rounds: number
  fairway_hit_pct: number | null
  fairway_left_pct: number | null
  fairway_right_pct: number | null
  fairway_tracked_holes: number
  gir_pct: number | null
  gir_tracked_holes: number
  green_miss_long_pct: number | null
  green_miss_short_pct: number | null
  green_miss_left_pct: number | null
  green_miss_right_pct: number | null
  green_miss_tracked_holes: number
  one_putt_pct: number | null
  putt_dist_one_pct: number | null
  putt_dist_two_pct: number | null
  putt_dist_three_plus_pct: number | null
  scrambling_pct: number | null
  sand_save_pct: number | null
  avg_chip_per_round: number | null
  avg_bunker_per_round: number | null
  avg_penalty_per_round: number | null
  avg_anyway_per_round: number | null
  avg_to_par_with_gir: number | null
  avg_to_par_without_gir: number | null
  avg_to_par_fairway_hit: number | null
  avg_to_par_fairway_miss: number | null
  avg_to_par_with_bunker: number | null
  avg_to_par_without_bunker: number | null
  avg_to_par_with_anyway: number | null
  avg_to_par_without_anyway: number | null
}

type ApiWindowSummary = {
  window: string
  current: ApiStatsSummary
  previous: ApiStatsSummary
}

type WindowKey = "last_round" | "last_5" | "last_10" | "month" | "year" | "last_year" | "all"

const WINDOW_OPTIONS: { key: WindowKey; label: string }[] = [
  { key: "last_round", label: "Siste runde" },
  { key: "last_5", label: "Siste 5" },
  { key: "last_10", label: "Siste 10" },
  { key: "month", label: "Denne måneden" },
  { key: "year", label: "I år" },
  { key: "last_year", label: "Siste år" },
  { key: "all", label: "Alltid" },
]

function signed(n: number): string {
  const sign = n > 0 ? "+" : n < 0 ? "−" : "±"
  return `${sign}${Math.abs(n).toFixed(1).replace(".", ",")}`
}

function pct(n: number): string {
  return `${Math.round(n)} %`
}

// Prosentpoeng-differanse mellom to andeler (ikke "N % endring", men "N pp").
function signedPoints(n: number): string {
  const rounded = Math.round(n)
  const sign = rounded > 0 ? "+" : rounded < 0 ? "−" : "±"
  return `${sign}${Math.abs(rounded)} pp`
}

// "up" = høyere tall er bedre (fairwaytreff, GIR, ...), "down" = lavere
// tall er bedre (snitt til par, putt/runde, ...). Utelatt = ren beskrivende
// retning (miss-retning venstre/høyre osv.) -- ingen "bedre/verre" der.
function Delta({
  current,
  previous,
  format,
  goodDirection,
}: {
  current: number | null
  previous: number | null
  format: (diff: number) => string
  goodDirection?: "up" | "down"
}) {
  // Teksten "vs. forrige periode" var tidligere KUN skjermleser-tekst --
  // seende brukere så bare et ikon + et tall + "pp", uten noen synlig
  // forklaring på hva tallet ble sammenlignet MOT. Nå alltid synlig, slik
  // at delta-en er selvforklarende alene, uten å måtte lese en fjern
  // overskrift lenger oppe på siden (2026-08-12, brukertilbakemelding).
  if (current === null || previous === null) return null
  const diff = current - previous
  if (diff === 0) {
    return <span className="text-xs font-semibold text-muted-foreground">Uendret vs. forrige periode</span>
  }
  const improved = goodDirection === "up" ? diff > 0 : goodDirection === "down" ? diff < 0 : null
  const Icon = diff > 0 ? TrendingUp : TrendingDown
  const colorClass = improved === true ? "text-primary" : improved === false ? "text-brand-orange" : "text-muted-foreground"
  return (
    <span className={`inline-flex flex-wrap items-center gap-1 text-xs font-bold ${colorClass}`}>
      <Icon aria-hidden="true" className="size-3.5" />
      <span className="tabular-nums">{format(diff)}</span>
      <span className="font-semibold text-muted-foreground">vs. forrige periode</span>
    </span>
  )
}

function StatTile({
  label,
  value,
  hint,
  delta,
}: {
  label: string
  value: string
  hint?: string
  delta?: React.ReactNode
}) {
  return (
    <div className="flex flex-col gap-1 rounded-2xl border border-border bg-card p-4 shadow-md shadow-black/8">
      <span className="text-xs font-semibold uppercase tracking-wide text-muted-foreground">{label}</span>
      <span className="text-2xl font-extrabold tabular-nums text-foreground sm:text-3xl">{value}</span>
      {delta}
      {hint && <span className="text-xs text-muted-foreground">{hint}</span>}
    </div>
  )
}

function Card({ title, subtitle, children }: { title: string; subtitle?: string; children: React.ReactNode }) {
  return (
    <section className="flex flex-col gap-4 rounded-2xl border border-border bg-card p-4 shadow-md shadow-black/8 sm:p-5">
      <div>
        <h2 className="text-lg font-extrabold tracking-tight text-foreground">{title}</h2>
        {subtitle && <p className="text-sm text-muted-foreground">{subtitle}</p>}
      </div>
      {children}
    </section>
  )
}

function Section({
  title,
  icon: Icon,
  children,
}: {
  title: string
  icon: typeof BarChart3
  children: React.ReactNode
}) {
  return (
    <section className="flex flex-col gap-3">
      <h2 className="flex items-center gap-2 text-lg font-extrabold tracking-tight text-foreground">
        <Icon aria-hidden="true" className="size-5 text-primary" />
        {title}
      </h2>
      <div className="grid grid-cols-2 gap-3 sm:grid-cols-3">{children}</div>
    </section>
  )
}

// --- Donut: sentertall + inntil 4 fargede segmenter (conic-gradient) -------
// Gjenbrukt for BÅDE puttfordelingen (3 segmenter) og de enkle rednings-
// gaugene (1 segment fylt + resten "spor"). Prosent er ALLTID skrevet ut i
// en forklaringsliste under -- fargen bærer aldri betydningen alene.

function Donut({
  segments,
  centerValue,
  centerLabel,
  size = 132,
  thickness = 18,
  showLegend = true,
}: {
  segments: { label: string; value: number; color: string }[]
  centerValue: string
  centerLabel: string
  size?: number
  thickness?: number
  showLegend?: boolean
}) {
  let cursor = 0
  const stops: string[] = []
  for (const seg of segments) {
    const start = cursor
    const end = cursor + seg.value
    stops.push(`${seg.color} ${start}% ${end}%`)
    cursor = end
  }
  if (cursor < 100) stops.push(`var(--muted) ${cursor}% 100%`)
  const gradient = `conic-gradient(${stops.join(", ")})`

  const ring = (
    <div
      className="relative shrink-0 rounded-full"
      style={{ width: size, height: size, background: gradient }}
      role="img"
      aria-label={`${centerLabel}: ${centerValue}. ${segments.map((s) => `${s.label} ${Math.round(s.value)} prosent`).join(", ")}`}
    >
      <div
        className="absolute rounded-full bg-card"
        style={{
          width: size - thickness * 2,
          height: size - thickness * 2,
          top: thickness,
          left: thickness,
        }}
      />
      <div className="absolute inset-0 flex flex-col items-center justify-center">
        <span className="text-xl font-extrabold tabular-nums text-foreground">{centerValue}</span>
        <span className="text-[11px] font-semibold text-muted-foreground">{centerLabel}</span>
      </div>
    </div>
  )

  if (!showLegend) return ring

  return (
    <div className="flex flex-col items-center gap-3 sm:flex-row sm:items-center">
      {ring}
      <ul className="flex flex-1 flex-col gap-1.5">
        {segments.map((s) => (
          <li key={s.label} className="flex items-center gap-2 text-sm text-muted-foreground">
            <span aria-hidden="true" className="size-2.5 shrink-0 rounded-full" style={{ backgroundColor: s.color }} />
            <span className="flex-1">{s.label}</span>
            <span className="font-bold tabular-nums text-foreground">{Math.round(s.value)} %</span>
          </li>
        ))}
      </ul>
    </div>
  )
}

// --- Kompass-diagram for greentreff-miss-retning ----------------------------
// Greentreff i midten, langt over, kort under, venstre til venstre, høyre
// til høyre -- speiler hvor bommen faktisk gikk relativt til green, i
// stedet for en flat fordelingsbar. Alle fire retningsceller viser tallet
// sitt som tekst uansett -- retning er beskrivende, ikke god/dårlig, så
// ingen av dem fargekodes grønn/oransje (kun sentercellen, som ER et
// treff/bom-tall, får grønn fremheving).

function CompassCell({ icon: Icon, label, value }: { icon: typeof ArrowUp; label: string; value: number | null }) {
  return (
    <div className="flex min-h-16 flex-col items-center justify-center gap-0.5 rounded-2xl border border-border bg-card p-2">
      <Icon aria-hidden="true" className="size-4 text-muted-foreground" />
      <span className="text-lg font-extrabold tabular-nums text-foreground">{value !== null ? `${Math.round(value)} %` : "–"}</span>
      <span className="text-[11px] font-semibold text-muted-foreground">{label}</span>
    </div>
  )
}

// Greentreff (GIR) og Innspill var tidligere ÉN kombinert komponent
// (GirCompass). Splittet i to 2026-08-12 på brukerens eksplisitte
// instruks: GIR er en beregnet andel (traff/bommet), Innspill er en
// retningsbeskrivelse -- to ulike typer informasjon, samme prinsipp som
// round-stats.tsx sin split mellom "Greentreff (GIR)" og "Bom-retning på
// green" (se den filen).

function GirGauge({ hitPct, trackedHoles }: { hitPct: number | null; trackedHoles: number }) {
  if (hitPct === null) {
    return <p className="text-sm text-muted-foreground">Ingen greentreff-data registrert ennå.</p>
  }
  return (
    <div className="flex flex-col items-center gap-2">
      <Donut
        segments={[
          { label: "Traff green", value: hitPct, color: "var(--primary)" },
          { label: "Bommet green", value: 100 - hitPct, color: "var(--brand-orange)" },
        ]}
        centerValue={`${Math.round(hitPct)} %`}
        centerLabel="GIR"
      />
      <p className="text-xs text-muted-foreground">{trackedHoles} hull registrert</p>
    </div>
  )
}

function ApproachDirectionCompass({
  trackedHoles,
  long,
  short,
  left,
  right,
}: {
  trackedHoles: number
  long: number | null
  short: number | null
  left: number | null
  right: number | null
}) {
  if (trackedHoles === 0) {
    return <p className="text-sm text-muted-foreground">Ingen innspill med retning registrert ennå.</p>
  }
  return (
    <div className="flex flex-col items-center gap-3">
      <div className="grid w-full max-w-[280px] grid-cols-3 grid-rows-3 gap-2.5">
        <div aria-hidden="true" />
        <CompassCell icon={ArrowUp} label="Langt" value={long} />
        <div aria-hidden="true" />
        <CompassCell icon={ArrowLeft} label="Venstre" value={left} />
        <div className="flex items-center justify-center">
          <div className="relative flex size-14 items-center justify-center rounded-full bg-primary/15">
            <div className="flex size-10 items-center justify-center rounded-full bg-primary/30">
              <Flag aria-hidden="true" className="size-5 text-primary" fill="currentColor" />
            </div>
          </div>
        </div>
        <CompassCell icon={ArrowRight} label="Høyre" value={right} />
        <div aria-hidden="true" />
        <CompassCell icon={ArrowDown} label="Kort" value={short} />
        <div aria-hidden="true" />
      </div>
      <p className="text-center text-xs text-muted-foreground">{trackedHoles} innspill registrert med retning.</p>
    </div>
  )
}

// --- Fairway: enklere venstre/fairway/høyre-bar (ingen langt/kort-akse
// fra utslaget, så ikke et fullt kompass) --------------------------------

function FairwayBar({
  tracked,
  left,
  hit,
  right,
}: {
  tracked: number
  left: number | null
  hit: number | null
  right: number | null
}) {
  if (tracked === 0) return <p className="text-sm text-muted-foreground">Ingen utslag registrert ennå.</p>
  const segments = [
    { label: "Venstre", value: left, color: "var(--brand-orange)" },
    { label: "Fairway", value: hit, color: "var(--primary)" },
    { label: "Høyre", value: right, color: "var(--brand-orange)" },
  ]
  return (
    <div className="flex flex-col gap-2">
      <div className="flex h-4 w-full overflow-hidden rounded-full bg-muted">
        {segments.map((s) =>
          s.value && s.value > 0 ? (
            <div key={s.label} style={{ width: `${s.value}%`, backgroundColor: s.color }} title={`${s.label}: ${Math.round(s.value)} %`} />
          ) : null,
        )}
      </div>
      <div className="flex flex-wrap gap-x-4 gap-y-1 text-sm text-muted-foreground">
        {segments.map((s) => (
          <span key={s.label} className="inline-flex items-center gap-1.5">
            <span aria-hidden="true" className="size-2.5 rounded-full" style={{ backgroundColor: s.color }} />
            {s.label}: <span className="font-semibold tabular-nums text-foreground">{s.value !== null ? pct(s.value) : "–"}</span>
          </span>
        ))}
      </div>
    </div>
  )
}

// --- Utvikling over tid: stolpegraf + trendlinje -----------------------
// Brukerinstruks 2026-08-12: stolpe per runde (eldste til venstre) +
// trendlinje over. Tidligere bevisst UTSATT (se CHANGELOG 2026-07-28: "for
// lite rundehistorikk til å vise noe meningsfullt") -- bygges nå som
// brukeren har nok fullførte runder til at en trend faktisk sier noe.
//
// Fargevalg følger samme diverging-par som `Delta` allerede bruker på
// resten av siden (primary = under/på par, brand-orange = over par) --
// ikke en ny palett, samme etablerte semantikk. Trendlinjen er et
// glidende snitt (ikke rå lineær regresjon), tegnet i en nøytral,
// dempet farge og stiplet, slik at den tydelig leses som UTLEDET, ikke
// som en tredje rådataserie.

const TREND_BAR_WIDTH = 20
const TREND_BAR_GAP = 10
const TREND_CHART_HEIGHT = 160
const TREND_HALF_HEIGHT = TREND_CHART_HEIGHT / 2 - 14 // plass til dato-etiketter under

function movingAverage(values: number[], window: number): number[] {
  return values.map((_, i) => {
    const start = Math.max(0, i - window + 1)
    const slice = values.slice(start, i + 1)
    return slice.reduce((sum, v) => sum + v, 0) / slice.length
  })
}

function formatShortDate(iso: string): string {
  const d = new Date(iso)
  return `${d.getDate()}.${d.getMonth() + 1}`
}

// Stolpe med avrundet ende BORTE fra 0-linjen, skarp kant VED 0-linjen --
// samme prinsipp uansett om verdien er over eller under par (dataviz-
// skillets "4px avrundet dataende, skarp ved grunnlinjen").
function barPath(x: number, valueY: number, baselineY: number, width: number, radius: number): string {
  const top = Math.min(valueY, baselineY)
  const bottom = Math.max(valueY, baselineY)
  const h = bottom - top
  if (h < radius) {
    // For kort til å avrunde pent -- vanlig rektangel.
    return `M ${x} ${top} H ${x + width} V ${bottom} H ${x} Z`
  }
  const roundedAtTop = valueY < baselineY
  if (roundedAtTop) {
    return `M ${x} ${top + radius} A ${radius} ${radius} 0 0 1 ${x + radius} ${top} H ${x + width - radius} A ${radius} ${radius} 0 0 1 ${x + width} ${top + radius} V ${bottom} H ${x} Z`
  }
  return `M ${x} ${top} H ${x + width} V ${bottom - radius} A ${radius} ${radius} 0 0 1 ${x + width - radius} ${bottom} H ${x + radius} A ${radius} ${radius} 0 0 1 ${x} ${bottom - radius} Z`
}

function ScoreTrendChart({ series }: { series: ApiRoundSeriesPoint[] }) {
  if (series.length < 2) return null

  const values = series.map((p) => p.score_to_par)
  const trend = movingAverage(values, 3)
  const maxAbs = Math.max(...values.map((v) => Math.abs(v)), 1)
  const scale = TREND_HALF_HEIGHT / maxAbs
  const baselineY = TREND_CHART_HEIGHT - 20
  const width = series.length * (TREND_BAR_WIDTH + TREND_BAR_GAP) + TREND_BAR_GAP

  const barCenterX = (i: number) => TREND_BAR_GAP + i * (TREND_BAR_WIDTH + TREND_BAR_GAP) + TREND_BAR_WIDTH / 2
  const valueToY = (v: number) => baselineY - v * scale

  const trendPoints = trend.map((v, i) => `${barCenterX(i)},${valueToY(v)}`).join(" ")

  return (
    <Card title="Utvikling" subtitle="Snitt til par per runde, eldste runde til venstre.">
      <div className="overflow-x-auto">
        <svg
          role="img"
          aria-label={`Snitt til par for ${series.length} runder, fra ${formatShortDate(series[0].played_at)} til ${formatShortDate(series[series.length - 1].played_at)}.`}
          viewBox={`0 0 ${width} ${TREND_CHART_HEIGHT}`}
          width={width}
          height={TREND_CHART_HEIGHT}
          className="block"
        >
          {/* 0-linjen (par) -- hårfin, ubrutt, tilbaketrukket, som resten av rutenettet skal være. */}
          <line x1={0} y1={baselineY} x2={width} y2={baselineY} stroke="var(--border)" strokeWidth={1} />

          {series.map((point, i) => {
            const cx = barCenterX(i)
            const overPar = point.score_to_par > 0
            const isLast = i === series.length - 1
            return (
              <g key={point.played_at + i}>
                <path
                  d={barPath(cx - TREND_BAR_WIDTH / 2, valueToY(point.score_to_par), baselineY, TREND_BAR_WIDTH, 4)}
                  fill={overPar ? "var(--brand-orange)" : "var(--primary)"}
                >
                  <title>
                    {formatShortDate(point.played_at)}: {signed(point.score_to_par)}
                  </title>
                </path>
                {/* Direkte etikett kun på siste (nyeste) stolpe -- dataviz-prinsipp
                    "merk endepunktet, ikke hvert punkt". Resten leses via 0-linjen,
                    stolpenes relative høyde, og trendlinjens retning. */}
                {isLast && (
                  <text
                    x={cx}
                    y={valueToY(point.score_to_par) + (overPar ? -6 : 14)}
                    textAnchor="middle"
                    className="fill-foreground text-[11px] font-bold tabular-nums"
                  >
                    {signed(point.score_to_par)}
                  </text>
                )}
                {(i === 0 || i === series.length - 1 || i === Math.floor(series.length / 2)) && (
                  <text x={cx} y={TREND_CHART_HEIGHT - 4} textAnchor="middle" className="fill-muted-foreground text-[10px] font-semibold">
                    {formatShortDate(point.played_at)}
                  </text>
                )}
              </g>
            )
          })}

          <polyline points={trendPoints} fill="none" stroke="var(--muted-foreground)" strokeWidth={2} strokeDasharray="5 4" strokeLinecap="round" />
        </svg>
      </div>
      <div className="flex flex-wrap items-center gap-x-4 gap-y-1 text-xs font-semibold text-muted-foreground">
        <span className="inline-flex items-center gap-1.5">
          <span aria-hidden="true" className="h-0.5 w-4 rounded-full" style={{ backgroundColor: "var(--muted-foreground)", opacity: 0.7 }} />
          Trendlinje (glidende snitt, siste 3 runder)
        </span>
      </div>
    </Card>
  )
}

// --- Til par: med vs. uten en gitt hendelse på hullet -----------------------
// Brukerens eksplisitte instruks 2026-07-28: se snitt til par NÅR noe
// inntraff mot NÅR det ikke gjorde det (greentreff, fairwaytreff, bunker,
// anywayslag), i stedet for bare en isolert prosentandel. Fargen følger
// hvilken av de to som FAKTISK var lavest denne perioden (ikke en fast
// antakelse om hvilken side som "skal" være best), siden det er selve
// sammenligningen som er poenget.

function CompareToPar({
  title,
  aLabel,
  aValue,
  bLabel,
  bValue,
}: {
  title: string
  aLabel: string
  aValue: number | null
  bLabel: string
  bValue: number | null
}) {
  if (aValue === null && bValue === null) {
    return (
      <div>
        <h3 className="text-sm font-bold text-foreground">{title}</h3>
        <p className="text-sm text-muted-foreground">Ingen data registrert ennå.</p>
      </div>
    )
  }
  const aBetter = aValue !== null && bValue !== null && aValue < bValue
  const bBetter = aValue !== null && bValue !== null && bValue < aValue
  return (
    <div className="flex flex-col gap-2">
      <h3 className="text-sm font-bold text-foreground">{title}</h3>
      <div className="grid grid-cols-2 gap-3">
        <div className={`rounded-xl border p-3 ${aBetter ? "border-primary bg-primary/10" : "border-border bg-card"}`}>
          <span className="text-xs font-semibold text-muted-foreground">{aLabel}</span>
          <div className="text-xl font-extrabold tabular-nums text-foreground">{aValue !== null ? signed(aValue) : "–"}</div>
        </div>
        <div className={`rounded-xl border p-3 ${bBetter ? "border-primary bg-primary/10" : "border-border bg-card"}`}>
          <span className="text-xs font-semibold text-muted-foreground">{bLabel}</span>
          <div className="text-xl font-extrabold tabular-nums text-foreground">{bValue !== null ? signed(bValue) : "–"}</div>
        </div>
      </div>
    </div>
  )
}

export function RoundsStatsSummary() {
  const router = useRouter()
  const [window, setWindow] = useState<WindowKey>("all")
  const [data, setData] = useState<ApiWindowSummary | null>(null)
  const [error, setError] = useState<string | null>(null)

  useEffect(() => {
    let cancelled = false
    async function load() {
      try {
        const res = await fetch(`/rounds/stats/summary?window=${window}`, { credentials: "include" })
        if (res.status === 401) {
          router.replace("/logg-inn")
          return
        }
        if (!res.ok) throw new Error(`stats: ${res.status}`)
        const json: ApiWindowSummary = await res.json()
        if (!cancelled) setData(json)
      } catch {
        if (!cancelled) setError("Klarte ikke å hente statistikken. Prøv igjen om litt.")
      }
    }
    void load()
    return () => {
      cancelled = true
    }
  }, [router, window])

  const s = data?.current ?? null

  return (
    <div className="flex min-h-[100dvh] flex-col 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="/dashboard"
            aria-label="Til dashbord"
            className="flex size-11 shrink-0 items-center justify-center rounded-xl text-muted-foreground transition-colors hover:bg-accent/50 hover:text-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
          >
            <ArrowLeft aria-hidden="true" className="size-6" />
          </Link>
          <h1 className="text-lg font-extrabold tracking-tight text-foreground">Statistikk</h1>
        </div>
      </header>

      <main className="mx-auto flex w-full max-w-xl flex-1 flex-col gap-6 px-4 py-6 pb-16">
        <div className="flex gap-2 overflow-x-auto pb-1">
          {WINDOW_OPTIONS.map((opt) => (
            <button
              key={opt.key}
              type="button"
              onClick={() => setWindow(opt.key)}
              className={`min-h-11 shrink-0 rounded-full px-4 text-sm font-bold transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring ${
                window === opt.key ? "bg-primary text-primary-foreground" : "bg-muted text-foreground hover:bg-accent"
              }`}
            >
              {opt.label}
            </button>
          ))}
        </div>

        {error && (
          <p role="alert" className="text-base font-medium text-destructive">
            {error}
          </p>
        )}

        {data === null && !error ? (
          <div role="status" aria-live="polite" className="flex flex-col items-center justify-center gap-4 py-20 text-center">
            <div aria-hidden="true" className="size-9 animate-spin rounded-full border-4 border-primary/20 border-t-primary" />
            <span className="text-base font-medium text-muted-foreground">Laster statistikk…</span>
          </div>
        ) : s && s.rounds_completed === 0 ? (
          <div className="flex flex-col items-center gap-5 rounded-3xl border border-dashed border-border bg-card/50 px-6 py-16 text-center">
            <div className="flex size-16 items-center justify-center rounded-2xl bg-muted">
              <BarChart3 aria-hidden="true" className="size-8 text-muted-foreground" />
            </div>
            <div className="flex max-w-md flex-col gap-2">
              <h2 className="text-xl font-bold text-foreground">Ingen fullførte runder i perioden</h2>
              <p className="text-lg leading-relaxed text-muted-foreground text-pretty">
                Prøv et annet tidsvindu, eller kom tilbake etter neste fullførte runde.
              </p>
            </div>
          </div>
        ) : data ? (
          (() => {
            const s = data.current
            const p = data.previous
            return (
              <>
                <p className="text-base leading-relaxed text-muted-foreground text-pretty">
                  Aggregert over {s.rounds_completed} {s.rounds_completed === 1 ? "fullført runde" : "fullførte runder"}
                  {p.rounds_completed > 0 && (
                    <>
                      {" "}
                      · sammenlignet med {p.rounds_completed} {p.rounds_completed === 1 ? "runde" : "runder"} i perioden før
                    </>
                  )}
                  .
                </p>

                <Section title="Oversikt" icon={BarChart3}>
                  <StatTile label="Runder fullført" value={String(s.rounds_completed)} />
                  <StatTile
                    label="Snitt til par"
                    value={s.avg_score_to_par !== null ? signed(s.avg_score_to_par) : "–"}
                    delta={<Delta current={s.avg_score_to_par} previous={p.avg_score_to_par} format={signed} goodDirection="down" />}
                  />
                  <StatTile
                    label="Putt / 18 hull"
                    value={s.avg_putts_per_18 !== null ? s.avg_putts_per_18.toFixed(1).replace(".", ",") : "–"}
                    delta={<Delta current={s.avg_putts_per_18} previous={p.avg_putts_per_18} format={signed} goodDirection="down" />}
                    hint={
                      s.putts_tracked_rounds > 0
                        ? `${s.putts_tracked_rounds} ${s.putts_tracked_rounds === 1 ? "runde med" : "runder med"} puttsporing`
                        : "Ingen runder med puttsporing ennå"
                    }
                  />
                </Section>

                <ScoreTrendChart series={s.round_series} />

                {/* Rekkefølge 2026-08-12 (brukerinstruks): Utslag først, deretter
                    Greentreff (en beregnet andel), så Innspill (en retnings-
                    beskrivelse -- egen kortype av samme grunn som round-stats.tsx
                    skiller "Greentreff (GIR)" fra "Bom-retning på green"). Redning
                    og "Til par: med vs. uten" flyttet ned under Annet, se der. */}

                <Card title="Utslag" subtitle="Kun par 4/5, kun registrerte utslag.">
                  <FairwayBar tracked={s.fairway_tracked_holes} left={s.fairway_left_pct} hit={s.fairway_hit_pct} right={s.fairway_right_pct} />
                  <div className="flex items-center justify-between border-t border-border pt-3">
                    <span className="text-sm font-semibold text-muted-foreground">Fairwaytreff</span>
                    <Delta current={s.fairway_hit_pct} previous={p.fairway_hit_pct} format={signedPoints} goodDirection="up" />
                  </div>
                </Card>

                <Card title="Greentreff (GIR)" subtitle="Andel innspill som traff green i regulert antall slag.">
                  <GirGauge hitPct={s.gir_pct} trackedHoles={s.gir_tracked_holes} />
                  <div className="flex items-center justify-between border-t border-border pt-3">
                    <span className="text-sm font-semibold text-muted-foreground">Greentreff</span>
                    <Delta current={s.gir_pct} previous={p.gir_pct} format={signedPoints} goodDirection="up" />
                  </div>
                </Card>

                <Card title="Innspill" subtitle="Retningen du bommer i, når du bommer greenen.">
                  <ApproachDirectionCompass
                    trackedHoles={s.green_miss_tracked_holes}
                    long={s.green_miss_long_pct}
                    short={s.green_miss_short_pct}
                    left={s.green_miss_left_pct}
                    right={s.green_miss_right_pct}
                  />
                </Card>

                <Card title="Putting">
                  <Donut
                    centerValue={s.avg_putts_per_18 !== null ? s.avg_putts_per_18.toFixed(1).replace(".", ",") : "–"}
                    centerLabel="putt / 18 hull"
                    segments={
                      s.putt_dist_one_pct !== null
                        ? [
                            { label: "1-putt", value: s.putt_dist_one_pct ?? 0, color: "var(--primary)" },
                            { label: "2-putt", value: s.putt_dist_two_pct ?? 0, color: "var(--info)" },
                            { label: "3-putt+", value: s.putt_dist_three_plus_pct ?? 0, color: "var(--brand-orange)" },
                          ]
                        : []
                    }
                  />
                  {s.putt_dist_one_pct === null && <p className="text-sm text-muted-foreground">Ingen puttfordeling registrert ennå.</p>}
                  <div className="flex items-center justify-between border-t border-border pt-3">
                    <span className="text-sm font-semibold text-muted-foreground">Én-putt</span>
                    <Delta current={s.one_putt_pct} previous={p.one_putt_pct} format={signedPoints} goodDirection="up" />
                  </div>
                </Card>

                <Section title="Chip, bunker og straffeslag" icon={Waves}>
                  <StatTile
                    label="Chip / runde"
                    value={s.avg_chip_per_round !== null ? s.avg_chip_per_round.toFixed(1).replace(".", ",") : "–"}
                    delta={<Delta current={s.avg_chip_per_round} previous={p.avg_chip_per_round} format={signed} goodDirection="down" />}
                  />
                  <StatTile
                    label="Bunkerslag / runde"
                    value={s.avg_bunker_per_round !== null ? s.avg_bunker_per_round.toFixed(1).replace(".", ",") : "–"}
                    delta={<Delta current={s.avg_bunker_per_round} previous={p.avg_bunker_per_round} format={signed} goodDirection="down" />}
                  />
                  <StatTile
                    label="Straffeslag / runde"
                    value={s.avg_penalty_per_round !== null ? s.avg_penalty_per_round.toFixed(1).replace(".", ",") : "–"}
                    delta={<Delta current={s.avg_penalty_per_round} previous={p.avg_penalty_per_round} format={signed} goodDirection="down" />}
                  />
                </Section>

                {s.avg_anyway_per_round !== null && (
                  <Section title="Annet" icon={Wind}>
                    <StatTile
                      label="Anywayslag / runde"
                      value={s.avg_anyway_per_round.toFixed(1).replace(".", ",")}
                      delta={<Delta current={s.avg_anyway_per_round} previous={p.avg_anyway_per_round} format={signed} goodDirection="down" />}
                    />
                  </Section>
                )}

                <Card title="Redning" subtitle="Par eller bedre etter en bom.">
                  <div className="grid grid-cols-2 gap-4">
                    <div className="flex flex-col items-center gap-2">
                      <Donut
                        size={104}
                        thickness={14}
                        showLegend={false}
                        centerValue={s.scrambling_pct !== null ? `${Math.round(s.scrambling_pct)}%` : "–"}
                        centerLabel=""
                        segments={s.scrambling_pct !== null ? [{ label: "Scrambling", value: s.scrambling_pct, color: "var(--primary)" }] : []}
                      />
                      <span className="text-sm font-bold text-foreground">Scrambling</span>
                      <Delta current={s.scrambling_pct} previous={p.scrambling_pct} format={signedPoints} goodDirection="up" />
                    </div>
                    <div className="flex flex-col items-center gap-2">
                      <Donut
                        size={104}
                        thickness={14}
                        showLegend={false}
                        centerValue={s.sand_save_pct !== null ? `${Math.round(s.sand_save_pct)}%` : "–"}
                        centerLabel=""
                        segments={s.sand_save_pct !== null ? [{ label: "Sand save", value: s.sand_save_pct, color: "var(--primary)" }] : []}
                      />
                      <span className="text-sm font-bold text-foreground">Sand save</span>
                      <Delta current={s.sand_save_pct} previous={p.sand_save_pct} format={signedPoints} goodDirection="up" />
                    </div>
                  </div>
                </Card>

                <Card title="Til par: med vs. uten" subtitle="Snitt til par på enkelthull, splittet på om noe faktisk inntraff.">
                  <CompareToPar
                    title="Greentreff (GIR)"
                    aLabel="Med GIR"
                    aValue={s.avg_to_par_with_gir}
                    bLabel="Uten GIR"
                    bValue={s.avg_to_par_without_gir}
                  />
                  <CompareToPar
                    title="Fairwaytreff"
                    aLabel="Traff fairway"
                    aValue={s.avg_to_par_fairway_hit}
                    bLabel="Bom fairway"
                    bValue={s.avg_to_par_fairway_miss}
                  />
                  <CompareToPar
                    title="Bunker"
                    aLabel="Ikke i bunker"
                    aValue={s.avg_to_par_without_bunker}
                    bLabel="I bunker"
                    bValue={s.avg_to_par_with_bunker}
                  />
                  <CompareToPar
                    title="Anywayslag"
                    aLabel="Uten anywayslag"
                    aValue={s.avg_to_par_without_anyway}
                    bLabel="Med anywayslag"
                    bValue={s.avg_to_par_with_anyway}
                  />
                </Card>
              </>
            )
          })()
        ) : null}
      </main>
    </div>
  )
}