"use client";

import { useMemo, useState } from "react";
import type { Visa } from "@/lib/types";

interface Props {
  visas: Visa[];
}

const INCOME_OPTIONS = [
  { key: "low", label: "💰 低于 ¥8,000/月", max: 8000 },
  { key: "mid", label: "💼 ¥8,000 – ¥20,000/月", max: 20000 },
  { key: "high", label: "🚀 ¥20,000 – ¥50,000/月", max: 50000 },
  { key: "premium", label: "👑 高于 ¥50,000/月", max: Infinity },
];

const DURATION_OPTIONS = [
  { key: "short", label: "⏱️ 1-3 个月", months: 3 },
  { key: "medium", label: "📅 3-12 个月", months: 12 },
  { key: "long", label: "🏠 1 年以上", months: 24 },
];

const REGION_OPTIONS = [
  { key: "any", label: "🌏 不限" },
  { key: "europe", label: "🏰 欧洲" },
  { key: "sea", label: "🌴 东南亚" },
  { key: "latam", label: "🌮 拉美" },
];

const VISA_INCOME: Record<string, number> = {
  "1": 6000, "2": 17000, "3": 2000, "4": 47000, "5": 18000, "6": 28000,
};

const VISA_REGION: Record<string, string> = {
  "1": "europe", "2": "europe", "3": "sea", "4": "sea", "5": "latam", "6": "europe",
};

export default function VisaWizard({ visas }: Props) {
  const [step, setStep] = useState(0);
  const [income, setIncome] = useState("");
  const [duration, setDuration] = useState("");
  const [region, setRegion] = useState("any");
  const [showResults, setShowResults] = useState(false);

  const results = useMemo(() => {
    if (!income || !duration) return [];
    const incomeOpt = INCOME_OPTIONS.find((o) => o.key === income)!;
    const durOpt = DURATION_OPTIONS.find((o) => o.key === duration)!;

    return visas
      .map((v) => {
        let score = 0;
        const reqIncome = VISA_INCOME[v.id] ?? 15000;
        const vRegion = VISA_REGION[v.id] ?? "any";

        if (reqIncome <= incomeOpt.max) score += 40;
        else if (reqIncome <= incomeOpt.max * 1.5) score += 20;

        if (v.difficulty <= 35) score += 25;
        else if (v.difficulty <= 55) score += 15;
        else score += 5;

        if (durOpt.months >= 12 && v.duration.includes("年")) score += 20;
        else if (durOpt.months <= 3) score += v.duration.includes("天") ? 20 : 10;
        else score += 15;

        if (region === "any" || vRegion === region) score += 15;

        return { visa: v, score: Math.min(score, 100) };
      })
      .filter((r) => r.score >= 30)
      .sort((a, b) => b.score - a.score)
      .slice(0, 3);
  }, [visas, income, duration, region]);

  const canNext = step === 0 ? !!income : step === 1 ? !!duration : true;

  const handleFinish = () => {
    setShowResults(true);
    setStep(3);
  };

  const reset = () => {
    setStep(0);
    setIncome("");
    setDuration("");
    setRegion("any");
    setShowResults(false);
  };

  return (
    <div className="visa-wizard reveal">
      <div className="visa-wizard-header">
        <span className="section-tag">🧙 VISA WIZARD</span>
        <h3>签证智能匹配</h3>
        <p>回答 3 个问题，找到最适合你的远程工作签证</p>
      </div>

      {!showResults ? (
        <div className="visa-wizard-body">
          <div className="visa-wizard-steps">
            {["月收入", "停留时长", "目的地"].map((label, i) => (
              <div key={label} className={`wizard-step-dot${i <= step ? " active" : ""}${i < step ? " done" : ""}`}>
                <span>{i < step ? "✓" : i + 1}</span>
                <small>{label}</small>
              </div>
            ))}
          </div>

          {step === 0 && (
            <div className="wizard-options">
              {INCOME_OPTIONS.map((o) => (
                <button key={o.key} className={`wizard-option${income === o.key ? " selected" : ""}`} onClick={() => setIncome(o.key)}>
                  {o.label}
                </button>
              ))}
            </div>
          )}

          {step === 1 && (
            <div className="wizard-options">
              {DURATION_OPTIONS.map((o) => (
                <button key={o.key} className={`wizard-option${duration === o.key ? " selected" : ""}`} onClick={() => setDuration(o.key)}>
                  {o.label}
                </button>
              ))}
            </div>
          )}

          {step === 2 && (
            <div className="wizard-options">
              {REGION_OPTIONS.map((o) => (
                <button key={o.key} className={`wizard-option${region === o.key ? " selected" : ""}`} onClick={() => setRegion(o.key)}>
                  {o.label}
                </button>
              ))}
            </div>
          )}

          <div className="wizard-nav">
            {step > 0 && <button className="btn btn-ghost" onClick={() => setStep(step - 1)}>← 上一步</button>}
            {step < 2 ? (
              <button className="btn btn-primary" disabled={!canNext} onClick={() => setStep(step + 1)}>下一步 →</button>
            ) : (
              <button className="btn btn-primary" onClick={handleFinish}>查看推荐 ✨</button>
            )}
          </div>
        </div>
      ) : (
        <div className="visa-wizard-results">
          {results.length === 0 ? (
            <p className="wizard-empty">暂无完全匹配的签证，建议咨询专业移民顾问或放宽条件重试</p>
          ) : (
            <div className="wizard-result-cards">
              {results.map(({ visa, score }, i) => (
                <div key={visa.id} className={`wizard-result-card${i === 0 ? " winner" : ""}`}>
                  {i === 0 && <span className="wizard-winner-badge">🏆 最佳匹配</span>}
                  <div className="wizard-result-top">
                    <span className="wizard-result-flag">{visa.flag}</span>
                    <div>
                      <h4>{visa.name}</h4>
                      <span className="wizard-match-score">{score}% 匹配</span>
                    </div>
                  </div>
                  <ul>
                    <li>💰 {visa.income_req}</li>
                    <li>📅 {visa.duration}</li>
                    <li>⏱️ {visa.approval_time}</li>
                  </ul>
                </div>
              ))}
            </div>
          )}
          <button className="btn btn-ghost" onClick={reset}>🔄 重新匹配</button>
        </div>
      )}
    </div>
  );
}