"use client";

import { useCallback, useEffect, useState } from "react";

import { OPORD_DIFFICULTIES, type OpordDifficulty } from "@/lib/opord-recall";
import type { OpordStats } from "@/app/(frontend)/opord/actions";
import { useRealtimePresence } from "@/hooks/useRealtimePresence";
import { useSidebar } from "@/components/ui/sidebar";
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import { RadioGroup, RadioGroupItem } from "@/components/ui/radio-group";
import { cn } from "@/lib/utils";
import { OpordGame } from "./OpordGame";
import { OpordLeaderboard } from "./OpordLeaderboard";

const TIER_OPTIONS = [
  { value: "recruit", label: "Recruit", detail: "10 questions · 130s recall · core order" },
  { value: "veteran", label: "Veteran", detail: "15 questions · 195s recall · extended order" },
  { value: "elite", label: "Elite", detail: "20 questions · 265s recall · full order" },
] as const satisfies ReadonlyArray<{
  readonly value: OpordDifficulty;
  readonly label: string;
  readonly detail: string;
}>;

const TIER_STAT_KEYS = {
  recruit: "recruitBestScore",
  veteran: "veteranBestScore",
  elite: "eliteBestScore",
} as const satisfies Record<OpordDifficulty, "recruitBestScore" | "veteranBestScore" | "eliteBestScore">;

export function OpordArena({
  initialStats,
  currentUserId,
}: {
  initialStats: OpordStats;
  currentUserId: number | string;
}) {
  const [stats, setStats] = useState<OpordStats>(initialStats);
  const [refreshKey, setRefreshKey] = useState(0);
  const [difficulty, setDifficulty] = useState<OpordDifficulty>("recruit");
  const [playing, setPlaying] = useState(false);
  const { isMobile, setOpenMobile } = useSidebar();
  const activeOperators = useRealtimePresence("opord", playing, true);

  const handlePhaseChange = useCallback((nextPhase: "ready" | "briefing" | "quiz" | "over") => {
    setPlaying(nextPhase === "briefing" || nextPhase === "quiz");
  }, []);

  const handleGameRecorded = useCallback((nextStats: OpordStats) => {
    setStats(nextStats);
    setRefreshKey((key) => key + 1);
  }, []);

  useEffect(() => {
    if (playing && isMobile) setOpenMobile(false);
  }, [isMobile, playing, setOpenMobile]);

  return (
    <div className="mx-auto flex w-full max-w-4xl flex-col items-center gap-6">
      <Card className="w-full">
        <CardHeader>
          <CardTitle>Choose a briefing tier</CardTitle>
          <CardDescription>
            Study the order for as long as you like. Once the recall quiz starts, the clock is
            unforgiving.
          </CardDescription>
        </CardHeader>
        <CardContent>
          <fieldset
            disabled={playing}
            className={cn(
              "m-0 min-w-0 border-0 p-0 transition-opacity duration-200 motion-reduce:transition-none",
              playing && "opacity-60",
            )}
          >
            <RadioGroup
              value={difficulty}
              onValueChange={(value) => {
                if (value === "recruit" || value === "veteran" || value === "elite") {
                  setDifficulty(value);
                }
              }}
              aria-label="OPORD Recall difficulty"
              className="grid gap-2 md:grid-cols-3"
            >
              {TIER_OPTIONS.map((option) => (
                <label
                  key={option.value}
                  htmlFor={`opord-tier-${option.value}`}
                  className={cn(
                    "flex cursor-pointer items-start gap-3 rounded-lg border border-border bg-background px-3 py-3 transition-colors focus-within:ring-2 focus-within:ring-ring motion-reduce:transition-none",
                    difficulty === option.value && "border-primary bg-accent",
                    playing && "cursor-not-allowed",
                  )}
                >
                  <RadioGroupItem
                    id={`opord-tier-${option.value}`}
                    value={option.value}
                    aria-label={`${option.label} briefing tier`}
                  />
                  <span className="flex min-w-0 flex-1 flex-col gap-1">
                    <span className="flex items-center justify-between gap-2">
                      <span className="font-medium">{option.label}</span>
                      <span className="font-mono text-xs tabular-nums text-muted-foreground">
                        {stats[TIER_STAT_KEYS[option.value]]} pts
                      </span>
                    </span>
                    <span className="text-xs text-muted-foreground">{option.detail}</span>
                  </span>
                </label>
              ))}
            </RadioGroup>
          </fieldset>
        </CardContent>
      </Card>

      <OpordGame
        key={difficulty}
        initialStats={stats}
        difficulty={difficulty}
        onGameRecordedAction={handleGameRecorded}
        onPhaseChangeAction={handlePhaseChange}
      />

      <Card className="w-full max-w-3xl">
        <CardHeader className="pb-3">
          <CardTitle className="text-sm">Recall protocol</CardTitle>
        </CardHeader>
        <CardContent className="grid gap-3 text-xs text-muted-foreground sm:grid-cols-3">
          <div className="flex flex-col gap-1">
            <span className="font-medium text-foreground">Study</span>
            <span>
              The order covers the objective grid, azimuth, H-HOUR, phase lines, codewords,
              callsign, and radio frequency. Veteran tiers add garrison tasks, rules of
              engagement, and a secondary objective; elite adds intelligence targets and a
              tertiary objective. Study it at your own pace, then press "Begin recall" when
              you are ready for the quiz.
            </span>
          </div>
          <div className="flex flex-col gap-1">
            <span className="font-medium text-foreground">Recall</span>
            <span>
              Questions come one at a time with no going back, and the whole quiz is capped at{" "}
              {OPORD_DIFFICULTIES[difficulty].quizSeconds} seconds on this tier. Each correct answer
              is worth {OPORD_DIFFICULTIES[difficulty].correctPoints} points, so speed and accuracy
              both count.
            </span>
          </div>
          <div className="flex flex-col gap-1">
            <span className="font-medium text-foreground">Debrief</span>
            <span>
              A perfect run inside {OPORD_DIFFICULTIES[difficulty].parTimeMs / 1000}s earns a{" "}
              {OPORD_DIFFICULTIES[difficulty].perfectBonus}-point bonus. Each tier tracks its own
              best score.
            </span>
          </div>
        </CardContent>
      </Card>

      <OpordLeaderboard
        refreshKey={refreshKey}
        difficulty={difficulty}
        currentUserId={currentUserId}
        activeOperators={activeOperators}
      />
    </div>
  );
}