"use client";

import Link from "next/link";
import { useRouter } from "next/navigation";
import { useToast } from "@/lib/toast";
import { COMPARE_METRICS, getWinnerIdx, overallScore, compareUrl } from "@/lib/compareScore";
import { mergeDestinationsIntoTrip } from "@/lib/tripActions";
import type { Destination } from "@/lib/types";

interface Props {
  destinations: Destination[];
  onClose: () => void;
}

export default function CompareModal({ destinations, onClose }: Props) {
  const router = useRouter();
  const { toast } = useToast();
  const scores = destinations.map(overallScore);
  const winnerIdx = scores.indexOf(Math.max(...scores));
  const pageHref = compareUrl(destinations.map((d) => d.slug));

  const addAllToPlan = () => {
    const { added, skipped } = mergeDestinationsIntoTrip(destinations, 1);
    onClose();
    if (added === 0) {
      toast(skipped ? "这些城市已在计划中" : "未能加入", "info");
      router.push("/plan");
      return;
    }
    toast(`已加入 ${added} 座城市到计划${skipped ? `（跳过 ${skipped}）` : ""}`);
    router.push("/plan");
  };

  const shareCompare = async () => {
    const url = `${window.location.origin}${pageHref}`;
    await navigator.clipboard.writeText(url);
    toast("对比链接已复制");
  };

  return (
    <div className="modal-overlay open" onClick={(e) => e.target === e.currentTarget && onClose()}>
      <div className="modal compare-modal">
        <button className="modal-close" onClick={onClose} aria-label="关闭">✕</button>
        <div className="modal-body compare-modal-body">
          <div className="compare-modal-header">
            <span className="section-tag">⚖️ COMPARE</span>
            <h2>城市对比分析</h2>
            <p>可视化对比关键指标，帮你做出最佳选择</p>
          </div>

          <div className="compare-cards">
            {destinations.map((d, i) => (
              <div key={d.slug} className={`compare-city-card${i === winnerIdx ? " winner" : ""}`}>
                {i === winnerIdx && <span className="compare-winner-badge">👑 综合推荐</span>}
                <span className="compare-city-emoji">{d.emoji}</span>
                <h3>{d.name}</h3>
                <span className="compare-city-country">{d.country}</span>
                <div className="compare-score-ring">
                  <svg viewBox="0 0 80 80">
                    <circle cx="40" cy="40" r="34" fill="none" stroke="rgba(255,255,255,0.06)" strokeWidth="6" />
                    <circle
                      cx="40" cy="40" r="34" fill="none"
                      stroke="url(#scoreGrad)" strokeWidth="6"
                      strokeLinecap="round"
                      strokeDasharray={`${scores[i] * 2.14} 214`}
                      transform="rotate(-90 40 40)"
                    />
                  </svg>
                  <span className="compare-score-num">{scores[i]}</span>
                </div>
                <Link href={`/destinations/${d.slug}`} className="compare-city-link">查看详情 →</Link>
              </div>
            ))}
          </div>

          <div className="compare-metrics">
            {COMPARE_METRICS.map((m) => {
              const values = destinations.map(m.get);
              const winIdx = getWinnerIdx(values, m.lowerBetter);
              const maxVal = Math.max(...values);
              return (
                <div key={m.label} className="compare-metric-row">
                  <div className="compare-metric-label">{m.emoji} {m.label}</div>
                  <div className="compare-metric-bars">
                    {destinations.map((d, i) => {
                      const val = m.get(d);
                      const pct = maxVal > 0 ? (val / maxVal) * 100 : 0;
                      return (
                        <div key={d.slug} className="compare-bar-item">
                          <div className="compare-bar-header">
                            <span>{d.emoji} {d.name}</span>
                            <span className={i === winIdx ? "compare-best" : ""}>
                              {i === winIdx && "🏆 "}{m.format(val)}
                            </span>
                          </div>
                          <div className="compare-bar-track">
                            <div
                              className={`compare-bar-fill${i === winIdx ? " best" : ""}`}
                              style={{ width: `${pct}%`, animationDelay: `${i * 0.1}s` }}
                            />
                          </div>
                        </div>
                      );
                    })}
                  </div>
                </div>
              );
            })}
          </div>

          <div className="compare-modal-actions">
            <button type="button" className="btn btn-ghost" onClick={shareCompare}>🔗 复制对比链接</button>
            <Link href={pageHref} className="btn btn-ghost" onClick={onClose}>打开完整对比页</Link>
            <button type="button" className="btn btn-primary" onClick={addAllToPlan}>全部写入计划 →</button>
          </div>

          <svg width="0" height="0">
            <defs>
              <linearGradient id="scoreGrad" x1="0%" y1="0%" x2="100%" y2="0%">
                <stop offset="0%" stopColor="#FF6B6B" />
                <stop offset="50%" stopColor="#FFE66D" />
                <stop offset="100%" stopColor="#4ECDC4" />
              </linearGradient>
            </defs>
          </svg>
        </div>
      </div>
    </div>
  );
}