"use client";

import { useState, useEffect } from "react";
import { useParams } from "next/navigation";
import Link from "next/link";
import { generateQueens, QueensPuzzle } from "@/lib/generators/queens";
import QueensBoard from "@/components/QueensBoard";
import { levelToDate, queensSizeForLevel, levelMeta, TOTAL_LEVELS, GAME_META } from "@/lib/levels";
import { getGameProgress, recordLevelSolve } from "@/lib/progress";

const DIFF_COLORS: Record<number, { bg: string; text: string }> = {
  1: { bg: "#f0fdf4", text: "#16a34a" },
  2: { bg: "#fefce8", text: "#ca8a04" },
  3: { bg: "#fff7ed", text: "#ea580c" },
  4: { bg: "#fef2f2", text: "#dc2626" },
  5: { bg: "#faf5ff", text: "#9333ea" },
};

function fmt(s: number) {
  return `${String(Math.floor(s / 60)).padStart(2, "0")}:${String(s % 60).padStart(2, "0")}`;
}

export default function QueensLevelPage() {
  const { n } = useParams<{ n: string }>();
  const level = Math.max(1, Math.min(TOTAL_LEVELS, parseInt(n) || 1));
  const { accent } = GAME_META["queens"];

  const [puzzle, setPuzzle] = useState<QueensPuzzle | null>(null);
  const [completed, setCompleted] = useState(false);
  const [bestTime, setBestTime] = useState(0);

  useEffect(() => {
    const date = levelToDate(level);
    const size = queensSizeForLevel(level);
    setPuzzle(generateQueens(date, size));
    const p = getGameProgress("queens");
    const record = p[level];
    setCompleted(!!record);
    setBestTime(record?.bestTime ?? 0);
  }, [level]);

  const meta = levelMeta("queens", level);
  const diffColors = DIFF_COLORS[meta.difficulty];

  return (
    <div className="flex flex-col items-center gap-6">

      {/* Breadcrumb */}
      <div className="w-full flex items-center gap-1.5 text-xs text-gray-400">
        <Link href="/queens" className="hover:text-gray-600 transition-colors">Queens</Link>
        <span>/</span>
        <Link href="/queens/levels" className="hover:text-gray-600 transition-colors">Niveaux</Link>
        <span>/</span>
        <span className="text-gray-600 font-medium">Niveau {level}</span>
      </div>

      {/* Header */}
      <div className="text-center">
        <div className="flex items-center justify-center gap-2 mb-2">
          <h1 className="text-2xl font-bold text-gray-900 tracking-tight">Niveau {level}</h1>
          {completed && (
            <span className="flex items-center gap-1 text-xs font-semibold text-green-600 bg-green-50 px-2 py-0.5 rounded-full border border-green-200">
              <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth={3} strokeLinecap="round" strokeLinejoin="round">
                <polyline points="20 6 9 17 4 12"/>
              </svg>
              Complété
            </span>
          )}
        </div>

        <div className="flex items-center justify-center gap-2">
          <span
            className="text-xs font-semibold px-2.5 py-1 rounded-full"
            style={{ background: diffColors.bg, color: diffColors.text }}
          >
            {meta.difficultyLabel}
          </span>
          {completed && bestTime > 0 && (
            <span className="text-xs text-gray-400 timer-mono">⏱ {fmt(bestTime)}</span>
          )}
        </div>
      </div>

      {puzzle ? (
        <QueensBoard
          key={`level-queens-${level}`}
          puzzle={puzzle}
          date={`level-queens-${level}`}
          onSolve={(elapsed) => recordLevelSolve("queens", level, elapsed)}
        />
      ) : (
        <div className="py-20 text-gray-300 text-sm">Chargement…</div>
      )}

      {/* Level navigation */}
      <div className="flex items-center gap-3">
        {level > 1 && (
          <Link
            href={`/queens/level/${level - 1}`}
            className="flex items-center gap-1 px-4 py-2 rounded-full border border-gray-200 text-gray-500 text-sm hover:border-gray-300 hover:text-gray-700 transition-colors"
          >
            <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth={2} strokeLinecap="round"><polyline points="15 18 9 12 15 6"/></svg>
            Niveau {level - 1}
          </Link>
        )}
        <Link
          href="/queens/levels"
          className="px-4 py-2 rounded-full border border-gray-200 text-gray-500 text-sm hover:border-gray-300 hover:text-gray-700 transition-colors"
        >
          Tous les niveaux
        </Link>
        {level < TOTAL_LEVELS && (
          <Link
            href={`/queens/level/${level + 1}`}
            className="flex items-center gap-1 px-4 py-2 rounded-full text-white text-sm font-semibold transition-opacity hover:opacity-90"
            style={{ background: accent }}
          >
            Niveau {level + 1}
            <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth={2} strokeLinecap="round"><polyline points="9 18 15 12 9 6"/></svg>
          </Link>
        )}
      </div>
    </div>
  );
}