"use client";

import { useEffect, useState } from "react";
import { Flag, Trophy } from "lucide-react";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import { cn } from "@/lib/utils";
import type { EodDifficulty } from "@/app/(frontend)/minigames/eod/actions";
import type { PresenceParticipant } from "@/hooks/useRealtimePresence";

interface ApiUser {
  id: number;
  username?: string | null;
  displayName?: string | null;
  payloadDisplayName?: string | null;
}

interface ApiProfile {
  id: number;
  profileTitle?: string | null;
  user?: ApiUser | number | null;
  progression?: {
    minigames?: {
      eodMinesweeper?: {
        gamesPlayed?: number | null;
        wins?: number | null;
        bestScore?: number | null;
        xpEarned?: number | null;
        bestTrainingTime?: number | null;
        bestPerimeterTime?: number | null;
        bestSupplyRoadTime?: number | null;
        bestTrainingFlags?: number | null;
        bestPerimeterFlags?: number | null;
        bestSupplyRoadFlags?: number | null;
      } | null;
    } | null;
  } | null;
}

interface LeaderboardRow {
  id: number;
  userId: number | null;
  name: string;
  gamesPlayed: number;
  wins: number;
  bestScore: number;
  xpEarned: number;
  bestTime: number;
  bestFlags: number;
  isCurrentUser: boolean;
  isOutsideTopTen?: boolean;
}

interface EodLeaderboardProps {
  refreshKey?: number;
  currentUserId?: number | string;
  activeTeams?: PresenceParticipant[];
  difficulty: EodDifficulty;
  onDifficultyChange: (difficulty: EodDifficulty) => void;
}

function rankClass(index: number) {
  if (index === 0) return "font-bold text-amber-400";
  if (index === 1) return "font-semibold text-slate-300";
  if (index === 2) return "font-semibold text-amber-700";
  return "text-muted-foreground";
}

export function EodLeaderboard({
  refreshKey = 0,
  currentUserId,
  activeTeams = [],
  difficulty,
  onDifficultyChange,
}: EodLeaderboardProps) {
  const [rows, setRows] = useState<LeaderboardRow[] | null>(null);
  const [failed, setFailed] = useState(false);

  useEffect(() => {
    let cancelled = false;
    setFailed(false);

    const difficultyLabel =
      difficulty === "training"
        ? "Training"
        : difficulty === "perimeter"
          ? "Perimeter"
          : "SupplyRoad";
    const timeField = `progression.minigames.eodMinesweeper.best${difficultyLabel}Time`;
    const flagsField = `progression.minigames.eodMinesweeper.best${difficultyLabel}Flags`;
    const params = new URLSearchParams({
      sort: `${timeField},${flagsField}`,
      limit: "100",
      depth: "1",
    });
    params.set(`where[${timeField}][greater_than]`, "0");

    fetch(`/api/profiles?${params.toString()}`)
      .then((res) => {
        if (!res.ok) throw new Error("leaderboard fetch failed");
        return res.json() as Promise<{ docs?: ApiProfile[] }>;
      })
      .then((data) => {
        if (cancelled) return;
        const mapped: LeaderboardRow[] = (data.docs ?? []).map((doc) => {
          const eod = doc.progression?.minigames?.eodMinesweeper ?? {};
          const user = typeof doc.user === "object" && doc.user !== null ? doc.user : null;
          const name =
            user?.displayName || doc.profileTitle || user?.username || `Operator #${doc.id}`;
          return {
            id: doc.id,
            userId: user?.id ?? null,
            name,
            gamesPlayed: eod.gamesPlayed ?? 0,
            wins: eod.wins ?? 0,
            bestScore: eod.bestScore ?? 0,
            xpEarned: eod.xpEarned ?? 0,
            bestTime: eod[`best${difficultyLabel}Time` as keyof typeof eod] ?? 0,
            bestFlags: eod[`best${difficultyLabel}Flags` as keyof typeof eod] ?? 0,
            isCurrentUser: user ? String(user.id) === String(currentUserId) : false,
          };
        });
        const scored = mapped
          .filter((row) => row.bestTime > 0)
          .sort((a, b) => a.bestTime - b.bestTime || a.bestFlags - b.bestFlags);
        const visible = scored.slice(0, 10);
        const current = mapped.find((row) => row.isCurrentUser);
        if (current && !visible.some((row) => row.id === current.id)) {
          visible.push({ ...current, isOutsideTopTen: true });
        }
        setRows(visible);
      })
      .catch(() => {
        if (!cancelled) setFailed(true);
      });

    return () => {
      cancelled = true;
    };
  }, [difficulty, refreshKey, currentUserId]);

  return (
    <div className="w-full max-w-[520px] rounded-xl border border-border bg-card">
      <div className="flex items-center gap-2 border-b border-border px-4 py-3">
        <Trophy className="size-4 text-amber-400" />
        <h2 className="text-sm font-semibold">Minefield Clearance Leaderboard</h2>
        <div className="ml-auto flex items-center gap-2 text-xs text-muted-foreground">
          <Select
            value={difficulty}
            onValueChange={(value) => onDifficultyChange(value as EodDifficulty)}
          >
            <SelectTrigger aria-label="Leaderboard sector" className="h-8 w-[150px] text-xs">
              <SelectValue />
            </SelectTrigger>
            <SelectContent>
              <SelectItem value="training">Training Pad</SelectItem>
              <SelectItem value="perimeter">FOB Perimeter</SelectItem>
              <SelectItem value="supplyRoad">Main Supply Road</SelectItem>
            </SelectContent>
          </Select>
          <span>Top 10 · fastest clear</span>
        </div>
      </div>
      <div
        className="border-b border-border px-4 py-2 text-xs text-muted-foreground"
        aria-live="polite"
      >
        <span className="font-medium text-emerald-400">
          {activeTeams.length} defusal teams on site
        </span>
        {activeTeams.length > 0 && (
          <span className="ml-1 text-foreground">
            ({activeTeams.map((team) => team.name).join(", ")})
          </span>
        )}
      </div>

      {failed ? (
        <p className="px-4 py-4 text-sm text-muted-foreground">Could not load the leaderboard.</p>
      ) : rows === null ? (
        <div className="space-y-2 px-4 py-4">
          <div className="h-4 w-full animate-pulse rounded bg-border" />
          <div className="h-4 w-3/4 animate-pulse rounded bg-border" />
          <div className="h-4 w-1/2 animate-pulse rounded bg-border" />
        </div>
      ) : rows.length === 0 ? (
        <p className="px-4 py-4 text-sm text-muted-foreground">
          No clearances logged yet. Take the first sector!
        </p>
      ) : (
        <div className="overflow-x-auto">
          <table className="w-full text-sm">
            <thead>
              <tr className="text-left text-xs uppercase tracking-wider text-muted-foreground">
                <th className="px-4 py-2 font-medium">#</th>
                <th className="px-2 py-2 font-medium">Operator</th>
                <th className="px-2 py-2 text-right font-medium">Games</th>
                <th className="px-2 py-2 text-right font-medium">Wins</th>
                <th className="px-2 py-2 text-right font-medium">Time</th>
                <th className="px-2 py-2 text-right font-medium">
                  <Flag className="ml-auto size-3" aria-label="Flags" />
                </th>
                <th className="px-4 py-2 text-right font-medium">XP</th>
              </tr>
            </thead>
            <tbody className="divide-y divide-border">
              {rows.map((row, index) => (
                <tr
                  key={row.id}
                  className={cn(
                    row.isCurrentUser && "bg-accent/40",
                    row.isOutsideTopTen && "text-muted-foreground opacity-70",
                  )}
                  title={
                    row.isOutsideTopTen
                      ? "Operator status (not currently ranked in the top 10)"
                      : undefined
                  }
                >
                  <td className="px-4 py-2">
                    <span className={rankClass(index)}>
                      {row.isOutsideTopTen ? "-" : index + 1}
                    </span>
                  </td>
                  <td className="px-2 py-2 font-medium">
                    <span className="flex items-center gap-2">
                      <span className="max-w-[180px] truncate">{row.name}</span>
                      {row.isCurrentUser && (
                        <span className="shrink-0 text-xs text-muted-foreground">(you)</span>
                      )}
                      {row.isOutsideTopTen && (
                        <span className="shrink-0 text-[10px] font-normal uppercase tracking-wide text-muted-foreground">
                          unranked
                        </span>
                      )}
                      {row.userId !== null &&
                        activeTeams.some((team) => team.id === row.userId) && (
                          <span
                            className="size-2 rounded-full bg-emerald-400"
                            title="Clearing now"
                            aria-label="Clearing now"
                          />
                        )}
                    </span>
                  </td>
                  <td className="px-2 py-2 text-right tabular-nums text-muted-foreground">
                    {row.gamesPlayed}
                  </td>
                  <td className="px-2 py-2 text-right tabular-nums text-muted-foreground">
                    {row.wins}
                  </td>
                  <td className="px-2 py-2 text-right font-semibold tabular-nums">
                    {row.bestTime}s
                  </td>
                  <td className="px-2 py-2 text-right font-semibold tabular-nums">
                    {row.bestFlags}
                  </td>
                  <td className="px-4 py-2 text-right tabular-nums text-muted-foreground">
                    {row.xpEarned}
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      )}
    </div>
  );
}