"use client";

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

import {
  AIM_TRAINER_DIFFICULTIES,
  isAimTrainerDifficulty,
  type AimTrainerDifficulty,
} from "@/lib/minigames/aim-trainer";
import type { AimTrainerStats } from "@/app/(frontend)/minigames/qualification/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 { AimTrainerGame, type AimTrainerPhase } from "./AimTrainerGame";
import { AimTrainerLeaderboard } from "./AimTrainerLeaderboard";

const TIER_OPTIONS = [
  { value: "recruit", label: "Recruit", detail: "Steady silhouettes" },
  { value: "veteran", label: "Veteran", detail: "Moving range" },
  { value: "elite", label: "Elite", detail: "High-speed range" },
] as const satisfies ReadonlyArray<{
  readonly value: AimTrainerDifficulty;
  readonly label: string;
  readonly detail: string;
}>;

const TIER_STAT_KEYS = {
  recruit: { bestScore: "recruitBestScore", bestAccuracy: "recruitBestAccuracy" },
  veteran: { bestScore: "veteranBestScore", bestAccuracy: "veteranBestAccuracy" },
  elite: { bestScore: "eliteBestScore", bestAccuracy: "eliteBestAccuracy" },
} as const satisfies Record<
  AimTrainerDifficulty,
  {
    readonly bestScore: "recruitBestScore" | "veteranBestScore" | "eliteBestScore";
    readonly bestAccuracy: "recruitBestAccuracy" | "veteranBestAccuracy" | "eliteBestAccuracy";
  }
>;

export function AimTrainerArena({
  initialStats,
  currentUserId,
}: {
  readonly initialStats: AimTrainerStats;
  readonly currentUserId: number | string;
}) {
  const [stats, setStats] = useState<AimTrainerStats>(initialStats);
  const [refreshKey, setRefreshKey] = useState(0);
  const [difficulty, setDifficulty] = useState<AimTrainerDifficulty>("recruit");
  const [playing, setPlaying] = useState(false);
  const { isMobile, setOpenMobile } = useSidebar();
  const activeTrainees = useRealtimePresence("qualification", playing, true);

  const handlePhaseChange = useCallback((nextPhase: AimTrainerPhase) => {
    setPlaying(nextPhase === "playing");
  }, []);

  const handleGameRecorded = useCallback((nextStats: AimTrainerStats) => {
    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 qualification lane</CardTitle>
          <CardDescription>
            Each course lasts 30 seconds. Accuracy keeps your score climbing when the range gets
            busy.
          </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 (isAimTrainerDifficulty(value)) setDifficulty(value);
              }}
              aria-label="Qualification difficulty"
              className="grid gap-2 md:grid-cols-3"
            >
              {TIER_OPTIONS.map((option) => {
                const statKeys = TIER_STAT_KEYS[option.value];
                const optionStats = {
                  bestScore: stats[statKeys.bestScore],
                  bestAccuracy: stats[statKeys.bestAccuracy],
                };
                return (
                  <label
                    key={option.value}
                    htmlFor={`qualification-tier-${option.value}`}
                    className={cn(
                      "flex cursor-pointer items-start gap-3 rounded-lg border border-border bg-background px-3 py-3 transition-colors focus-within:ring-2 focus-within:ring-ring motion-reduce:transition-none",
                      difficulty === option.value && "border-primary bg-accent",
                      playing && "cursor-not-allowed",
                    )}
                  >
                    <RadioGroupItem
                      id={`qualification-tier-${option.value}`}
                      value={option.value}
                      aria-label={`${option.label} qualification lane`}
                    />
                    <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">
                          {optionStats.bestScore} pts
                        </span>
                      </span>
                      <span className="text-xs text-muted-foreground">{option.detail}</span>
                      <span className="font-mono text-xs tabular-nums text-muted-foreground">
                        Best accuracy {Math.round(optionStats.bestAccuracy * 100)}%
                      </span>
                    </span>
                  </label>
                );
              })}
            </RadioGroup>
          </fieldset>
        </CardContent>
      </Card>

      <AimTrainerGame
        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">Qualification 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">Acquire</span>
            <span>
              Up to {AIM_TRAINER_DIFFICULTIES[difficulty].maxConcurrentTargets} hostile silhouettes
              are active at once, plus an occasional blue civilian that never counts toward the
              limit. Targets rebound off each other and the range walls.
            </span>
          </div>
          <div className="flex flex-col gap-1">
            <span className="font-medium text-foreground">Prioritize</span>
            <span>
              Headshots score 250 points. Torso hits score 100 points. Blue civilians cost 100
              points, so never shoot them.
            </span>
          </div>
          <div className="flex flex-col gap-1">
            <span className="font-medium text-foreground">Qualify</span>
            <span>
              The course adds an accuracy bonus and records the best score for each lane. Current
              target window: {AIM_TRAINER_DIFFICULTIES[difficulty].targetLifetimeMs / 1000}s.
            </span>
          </div>
        </CardContent>
      </Card>

      <AimTrainerLeaderboard
        refreshKey={refreshKey}
        difficulty={difficulty}
        currentUserId={currentUserId}
        activeTrainees={activeTrainees}
      />
    </div>
  );
}