"use client"

// Hull-diagram v2 (2026-08-17, ADR-084) -- kategoriske venstre/senter/
// høyre-akser i stedet for kontinuerlig sideveis-forskyvning (ADR-083).
// Se ADR-084: kontinuerlig `crossMeters` ga for liten synlig forskjell
// på ekte banedata (Tjøme hull 18 -- bunker+vann havnet begge nesten på
// senterlinjen selv om de faktisk ligger på ulik side). Banevalget
// kommer nå fra `hazards[].lane`, satt av datalaget i
// hole-target-distance.tsx basert på `side_fairway` -- IKKE utledet her.
// Ren kontrollert komponent, ingen egen GPS-/geometrilogikk.

import { MapPin, TriangleAlert } from "lucide-react"
import { cn } from "@/lib/utils"

export type HazardKind = "sand" | "water" | "creek" | "rock" | "tree" | "dogleg" | "layup" | "landmark" | "generic"

export type DiagramHazard = {
  key: string
  kind: HazardKind
  label: string
  lane: "left" | "center" | "right"
  /** 0 = ved tee, 100 = ved green. */
  alongPercent: number
  /** Avstand FRA SPILLEREN, vises rett under ikonet. Alltid satt. */
  below: number
  /** Avstand til bakkant, vises rett over ikonet -- KUN satt når
   * hindringen er et ekte forkant+bakkant-par (se hazard_group i
   * datalaget). `null` = enkeltpunkt, ingen tekst over ikonet. */
  above: number | null
  /** Kun meningsfullt når `above` er `null` -- brukes i listen under
   * diagrammet til å si "forkant"/"senter"/"bakkant" om et
   * enkeltstående punkt. */
  location: "front" | "middle" | "back" | null
}

const _LANE_LABEL: Record<DiagramHazard["lane"], string> = {
  left: "Venstre",
  center: "Senter",
  right: "Høyre",
}
const _LOCATION_LABEL: Record<"front" | "middle" | "back", string> = {
  front: "forkant",
  middle: "midtpunkt",
  back: "bakkant",
}

type Props = {
  distances: { front: number; middle: number; back: number }
  playerPosition: { alongPercent: number }
  hazards: DiagramHazard[]
  size?: "compact" | "full"
  className?: string
}

const TRACK_TOP = 12 // where alongPercent === 100 lands (leaves room for the flag)
const TRACK_BOTTOM = 88 // where alongPercent === 0 lands (leaves room for the tee dot)
// Midtbanen har i tillegg faste green-/tee-ankre tegnet OVENPÅ selve
// sporet (green-ikon+etikett øverst, tee-prikk+etikett nederst) -- en
// hindring plassert etter samme skala som venstre/høyre-banen kunne
// dermed havne visuelt oppå green-ikonet. Reservert sone er banens
// egen skala, kun for midtbanen.
const CENTER_TRACK_TOP = 29
const CENTER_TRACK_BOTTOM = 80
const LABEL_MIN_GAP_PCT = 16 // hindringer i samme bane trenger mer luft nå (ikon + to tall)

// En hindring KAN ligge bak selve greenen (alongPercent > 100 -- f.eks.
// en bakre greenbunker) -- projectOntoAxis() klipper bevisst IKKE dette
// bort (se hole-geometry.ts). Uten særbehandling ville en slik hindring
// blitt klippet til samme posisjon som "helt inntil green" og dermed
// visuelt smeltet sammen med front-of-green-hindringer, selv om den
// fysisk ligger på MOTSATT side av green-ikonet. Løsning: når minst én
// senterbane-hindring er bak green, flyttes green-ankeret lenger ned
// (fra faste 3% til GREEN_TOP_PCT_PUSHED), og en egen, liten sone
// ovenfor det flyttede ankeret reserveres til disse hindringene --
// nærmest green kaskaderer OPPOVER (motsatt retning av layoutLane) ved
// kollisjon. Ingen tilsvarende sone finnes (ennå) for hindringer bak
// TEE -- ingen kjent forekomst i dagens data, men samme mønster kan
// gjenbrukes symmetrisk om det trengs.
const GREEN_TOP_PCT_DEFAULT = 3
const GREEN_TOP_PCT_PUSHED = 22
const CENTER_TRACK_TOP_PUSHED = 40
const BEHIND_GREEN_ZONE_TOP = 3
const BEHIND_GREEN_ZONE_BOTTOM = 19
const BEHIND_GREEN_MAX_OVERSHOOT = 40 // % av hull-lengden bak green før visuelt klippet til toppen

function clamp(n: number, lo: number, hi: number) {
  return Math.min(hi, Math.max(lo, n))
}

function alongToTopPct(alongPercent: number, top = TRACK_TOP, bottom = TRACK_BOTTOM) {
  const a = clamp(alongPercent, 0, 100)
  return top + ((100 - a) / 100) * (bottom - top)
}

function formatMeters(m: number) {
  return `${Math.round(m)} m`
}

const _ICON_SRC: Partial<Record<HazardKind, string>> = {
  sand: "/hole-diagram/hazard-sand.png",
  water: "/hole-diagram/hazard-water.png",
  creek: "/hole-diagram/hazard-creek.png",
  rock: "/hole-diagram/hazard-rock.png",
  tree: "/hole-diagram/hazard-tree.png",
  dogleg: "/hole-diagram/hazard-dogleg.png",
  layup: "/hole-diagram/hazard-layup.png",
  landmark: "/hole-diagram/hazard-landmark.png",
}

function HazardIcon({ kind, size = 32 }: { kind: HazardKind; size?: number }) {
  const src = _ICON_SRC[kind]
  if (src) {
    return <img src={src} width={size} height={size} alt="" className="block" style={{ height: "auto" }} />
  }
  return <TriangleAlert className="size-7 text-cup-strong" strokeWidth={2.5} />
}

/** Nudger ikoner i SAMME bane fra øverst til nederst hvis de er for
 * nære vertikalt -- samme kollisjons-mønster som før, men kjørt per
 * bane siden hindringer nå er spredt over tre baner. `top`/`bottom`
 * lar midtbanen reservere plass til de faste green-/tee-ankrene. */
function layoutLane(hazards: DiagramHazard[], top = TRACK_TOP, bottom = TRACK_BOTTOM) {
  const sorted = [...hazards].sort(
    (a, b) => alongToTopPct(a.alongPercent, top, bottom) - alongToTopPct(b.alongPercent, top, bottom),
  )
  const placed: (DiagramHazard & { topPct: number })[] = []
  let lastTop = Number.NEGATIVE_INFINITY
  for (const h of sorted) {
    const desired = alongToTopPct(h.alongPercent, top, bottom)
    const topPct = Math.max(desired, lastTop + LABEL_MIN_GAP_PCT)
    placed.push({ ...h, topPct })
    lastTop = topPct
  }
  return placed
}

function behindGreenDesiredTopPct(alongPercent: number) {
  const overshoot = clamp(alongPercent - 100, 0, BEHIND_GREEN_MAX_OVERSHOOT)
  // 0 overshoot (rett bak green) -> bunnen av sonen (nærmest green-ikonet).
  // Maks overshoot -> toppen av sonen (lengst unna, øverst i diagrammet).
  return (
    BEHIND_GREEN_ZONE_BOTTOM -
    (overshoot / BEHIND_GREEN_MAX_OVERSHOOT) * (BEHIND_GREEN_ZONE_BOTTOM - BEHIND_GREEN_ZONE_TOP)
  )
}

/** Speilvendt av layoutLane() -- kaskaderer OPPOVER (mot diagrammets
 * toppkant) ved kollisjon, siden disse hindringene ligger bak green,
 * ikke foran den. */
function layoutBehindGreenLane(hazards: DiagramHazard[]) {
  const sorted = [...hazards].sort(
    (a, b) => behindGreenDesiredTopPct(b.alongPercent) - behindGreenDesiredTopPct(a.alongPercent),
  )
  const placed: (DiagramHazard & { topPct: number })[] = []
  let lastTop = Number.POSITIVE_INFINITY
  for (const h of sorted) {
    const desired = behindGreenDesiredTopPct(h.alongPercent)
    const topPct = Math.min(desired, lastTop - LABEL_MIN_GAP_PCT)
    placed.push({ ...h, topPct })
    lastTop = topPct
  }
  return placed
}

function HazardMarker({ hazard, topPct }: { hazard: DiagramHazard; topPct: number }) {
  return (
    <div
      aria-hidden="true"
      className="absolute left-1/2 flex -translate-x-1/2 -translate-y-1/2 flex-col items-center gap-0.5"
      style={{ top: `${topPct}%` }}
    >
      {hazard.above !== null && (
        <span className="whitespace-nowrap rounded-md bg-clubhouse-card px-1.5 py-0.5 text-xs font-bold tabular-nums text-clubhouse-ink shadow-sm ring-1 ring-clubhouse-border">
          {formatMeters(hazard.above)}
        </span>
      )}
      <HazardIcon kind={hazard.kind} />
      <span className="whitespace-nowrap rounded-md bg-clubhouse-card px-1.5 py-0.5 text-xs font-bold tabular-nums text-clubhouse-ink shadow-sm ring-1 ring-clubhouse-border">
        {formatMeters(hazard.below)}
      </span>
    </div>
  )
}

export function HoleDiagram({ distances, playerPosition, hazards, size = "full", className }: Props) {
  if (size === "compact") {
    return (
      <div
        className={cn(
          "flex flex-col gap-2 rounded-xl border border-clubhouse-border bg-clubhouse-card p-3 text-clubhouse-ink",
          className,
        )}
      >
        <div className="flex items-baseline justify-center gap-3 tabular-nums">
          <CompactNumber label="Front" value={distances.front} />
          <CompactNumber label="Senter" value={distances.middle} emphasized />
          <CompactNumber label="Bak" value={distances.back} />
        </div>
        {hazards.length > 0 && (
          <ul className="flex flex-col gap-1 border-t border-clubhouse-border pt-2">
            {hazards.map((h) => (
              <li key={h.key} className="flex items-center gap-1.5 text-sm">
                <TriangleAlert aria-hidden="true" className="size-3.5 shrink-0 text-cup-strong" />
                <span className="min-w-0 flex-1 truncate text-clubhouse-muted">{h.label}</span>
                <span className="shrink-0 font-bold tabular-nums text-clubhouse-ink">
                  {formatMeters(h.below)}
                </span>
              </li>
            ))}
          </ul>
        )}
      </div>
    )
  }

  const leftHazards = layoutLane(hazards.filter((h) => h.lane === "left"))
  const centerAll = hazards.filter((h) => h.lane === "center")
  const centerBehindGreen = centerAll.filter((h) => h.alongPercent > 100)
  const centerNormal = centerAll.filter((h) => h.alongPercent <= 100)
  const hasBehindGreen = centerBehindGreen.length > 0
  const greenTopPct = hasBehindGreen ? GREEN_TOP_PCT_PUSHED : GREEN_TOP_PCT_DEFAULT
  const centerTrackTop = hasBehindGreen ? CENTER_TRACK_TOP_PUSHED : CENTER_TRACK_TOP
  const centerHazards = layoutLane(centerNormal, centerTrackTop, CENTER_TRACK_BOTTOM)
  const behindGreenHazards = layoutBehindGreenLane(centerBehindGreen)
  const rightHazards = layoutLane(hazards.filter((h) => h.lane === "right"))
  const playerTop = alongToTopPct(playerPosition.alongPercent)

  return (
    <div className={cn("flex w-full flex-col gap-4 text-clubhouse-ink", className)}>
      <div className="flex items-end justify-center gap-6 tabular-nums">
        <BigNumber label="Front" value={distances.front} />
        <BigNumber label="Senter" value={distances.middle} emphasized />
        <BigNumber label="Bak" value={distances.back} />
      </div>

      <div
        className="relative grid h-[24rem] w-full grid-cols-3 overflow-hidden rounded-2xl border border-clubhouse-border bg-clubhouse-field"
        role="img"
        aria-label={buildDiagramAria(distances, hazards, playerPosition)}
      >
        {/* Venstre bane */}
        <div className="relative">
          {leftHazards.map((h) => (
            <HazardMarker key={h.key} hazard={h} topPct={h.topPct} />
          ))}
        </div>

        {/* Midtbane -- eneste bane med green/tee/spiller, alltid faste ankre her */}
        <div className="relative border-x border-clubhouse-border/60">
          <div
            aria-hidden="true"
            className="absolute left-1/2 flex -translate-x-1/2 flex-col items-center gap-0.5"
            style={{ top: `${greenTopPct}%` }}
          >
            <img src="/hole-diagram/green-40.png" width={40} height={40} alt="" className="block" />
            <span className="rounded bg-clubhouse-card px-1.5 py-0.5 text-xs font-bold text-tee-strong">
              Green
            </span>
          </div>

          {behindGreenHazards.map((h) => (
            <HazardMarker key={h.key} hazard={h} topPct={h.topPct} />
          ))}

          <div
            aria-hidden="true"
            className="absolute bottom-[3%] left-1/2 flex -translate-x-1/2 flex-col items-center gap-0.5"
          >
            <span className="rounded bg-clubhouse-card px-1.5 py-0.5 text-xs font-bold text-clubhouse-muted">
              Tee
            </span>
            <span className="size-3 rounded-full border-2 border-clubhouse-muted bg-clubhouse-card" />
          </div>

          <div
            aria-hidden="true"
            className="absolute left-1/2 z-30 flex -translate-x-1/2 -translate-y-full flex-col items-center"
            style={{ top: `${playerTop}%` }}
          >
            <span className="mb-0.5 rounded bg-clubhouse-card px-1.5 py-0.5 text-xs font-bold text-tee-strong ring-1 ring-clubhouse-border">
              Deg
            </span>
            <MapPin className="size-6 fill-tee-strong text-clubhouse-card" strokeWidth={2} />
          </div>

          {centerHazards.map((h) => (
            <HazardMarker key={h.key} hazard={h} topPct={h.topPct} />
          ))}
        </div>

        {/* Høyre bane */}
        <div className="relative">
          {rightHazards.map((h) => (
            <HazardMarker key={h.key} hazard={h} topPct={h.topPct} />
          ))}
        </div>
      </div>

      {hazards.length > 0 && (
        <div className="flex flex-col gap-2">
          <h3 className="text-sm font-bold uppercase tracking-wide text-clubhouse-muted">
            Hindringer
          </h3>
          <ul className="flex flex-col divide-y divide-clubhouse-border rounded-xl border border-clubhouse-border bg-clubhouse-card">
            {hazards.map((h) => (
              <HazardRow key={h.key} hazard={h} />
            ))}
          </ul>
        </div>
      )}
    </div>
  )
}

function HazardRow({ hazard }: { hazard: DiagramHazard }) {
  const meta = [
    _LANE_LABEL[hazard.lane],
    hazard.above === null && hazard.location ? _LOCATION_LABEL[hazard.location] : null,
  ]
    .filter(Boolean)
    .join(" · ")
  return (
    <li className="flex items-center gap-3 px-3 py-2.5">
      <HazardIcon kind={hazard.kind} size={36} />
      <div className="min-w-0 flex-1">
        <div className="text-pretty text-base text-clubhouse-ink">{hazard.label}</div>
        <div className="text-sm text-clubhouse-muted">{meta}</div>
      </div>
      {hazard.above !== null ? (
        <div className="flex shrink-0 flex-col items-end text-clubhouse-ink">
          <span className="text-sm font-bold tabular-nums">Forkant {formatMeters(hazard.below)}</span>
          <span className="text-sm font-bold tabular-nums">Bakkant {formatMeters(hazard.above)}</span>
        </div>
      ) : (
        <span className="shrink-0 text-lg font-bold tabular-nums text-clubhouse-ink">
          {formatMeters(hazard.below)}
        </span>
      )}
    </li>
  )
}

function BigNumber({ label, value, emphasized }: { label: string; value: number; emphasized?: boolean }) {
  return (
    <div className="flex flex-col items-center">
      <span
        className={cn(
          "font-black leading-none tabular-nums",
          emphasized ? "text-6xl text-tee-strong" : "text-4xl text-clubhouse-ink",
        )}
      >
        {Math.round(value)}
      </span>
      <span
        className={cn(
          "mt-1 font-bold uppercase tracking-wide",
          emphasized ? "text-sm text-tee-strong" : "text-xs text-clubhouse-muted",
        )}
      >
        {label}
      </span>
    </div>
  )
}

function CompactNumber({ label, value, emphasized }: { label: string; value: number; emphasized?: boolean }) {
  return (
    <div className="flex flex-col items-center">
      <span
        className={cn(
          "font-black leading-none tabular-nums",
          emphasized ? "text-3xl text-tee-strong" : "text-xl text-clubhouse-ink",
        )}
      >
        {Math.round(value)}
      </span>
      <span className="text-[0.65rem] font-bold uppercase tracking-wide text-clubhouse-muted">{label}</span>
    </div>
  )
}

function buildDiagramAria(
  distances: Props["distances"],
  hazards: DiagramHazard[],
  player: Props["playerPosition"],
) {
  void player
  const base = `Baneskisse. Senter ${Math.round(distances.middle)} meter til green. Din posisjon markert.`
  if (hazards.length === 0) return `${base} Ingen hindringer.`
  const list = hazards
    .map((h) => {
      const lane = _LANE_LABEL[h.lane].toLowerCase()
      if (h.above !== null) {
        return `${h.label}, ${lane}, forkant ${Math.round(h.below)} meter, bakkant ${Math.round(h.above)} meter`
      }
      const location = h.location ? `, ${_LOCATION_LABEL[h.location]}` : ""
      return `${h.label}, ${lane}${location}, ${Math.round(h.below)} meter`
    })
    .join("; ")
  return `${base} Hindringer: ${list}.`
}
