import React, { useState, useCallback, useEffect, useRef } from 'react';
import { motion } from 'framer-motion';
import { Share2, Copy, Check, X, AlertTriangle, Building2 } from 'lucide-react';
import { useResponsive } from '../../hooks/useResponsive';
import { encryptShareParamsSync } from '../../utils/shareCrypto';
import { supabase } from '../../supabase/client';

interface ShareModalProps {
  isOpen: boolean;
  onClose: () => void;
  planId: string;
  factoryType: 'textile' | 'washing';
  factoryName?: string;
}

export function ShareModal({ isOpen, onClose, planId, factoryType, factoryName }: ShareModalProps) {
  const { isMobile } = useResponsive();
  const [copied, setCopied] = useState(false);
  const [showConfirm, setShowConfirm] = useState(false);
  const [recipientCompany, setRecipientCompany] = useState<string>('');
  const [confirmFactoryName, setConfirmFactoryName] = useState('');
  const [confirmCompanyName, setConfirmCompanyName] = useState('');
  const [error, setError] = useState('');
  const [shortCode, setShortCode] = useState<string>('');
  const shortLinkGenerated = useRef(false);

  // 获取当前用户的公司名称
  useEffect(() => {
    const fetchCompanyName = async () => {
      const { data: { user } } = await supabase.auth.getUser();
      if (user) {
        const { data: profile } = await supabase
          .from('profiles')
          .select('company_id')
          .eq('id', user.id)
          .single();
        if (profile?.company_id) {
          const { data: company } = await supabase
            .from('companies')
            .select('name')
            .eq('id', profile.company_id)
            .single();
          if (company) {
            setRecipientCompany(company.name);
          }
        }
      }
    };
    if (isOpen) {
      fetchCompanyName();
      // 生成短链
      if (!shortLinkGenerated.current) {
        shortLinkGenerated.current = true;
        generateShortLink();
      }
    } else {
      // 弹窗关闭时重置
      shortLinkGenerated.current = false;
      setShortCode('');
    }
  }, [isOpen]);

  // 生成短链
  const generateShortLink = useCallback(async () => {
    const baseUrl = window.location.origin + window.location.pathname;

    // 生成短码（6位随机字符）
    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    let code = '';
    for (let i = 0; i < 6; i++) {
      code += chars.charAt(Math.floor(Math.random() * chars.length));
    }

    // 保存到数据库
    const { data: { user } } = await supabase.auth.getUser();
    if (user) {
      const { error } = await supabase.from('share_links').insert({
        short_code: code,
        plan_id: planId,
        factory_type: factoryType,
        created_by: user.id,
        expires_at: new Date(Date.now() + 7 * 24 * 60 * 60 * 1000).toISOString() // 7天过期
      });

      if (!error) {
        setShortCode(code);
        console.log('短链生成成功:', code);
      } else {
        console.error('短链保存失败:', error);
      }
    } else {
      console.error('用户未登录，无法生成短链');
    }
  }, [planId, factoryType]);

  // 生成分享链接
  const generateShareLink = useCallback(() => {
    const baseUrl = window.location.origin + window.location.pathname;
    if (shortCode) {
      return `${baseUrl}#/import?s=${shortCode}`;
    }
    // 如果短链还未生成，使用长链接
    const token = encryptShareParamsSync(planId, factoryType);
    return `${baseUrl}#/import?token=${token}`;
  }, [planId, factoryType, shortCode]);

  const handleCopy = useCallback(async () => {
    const link = generateShareLink();
    try {
      await navigator.clipboard.writeText(link);
      setCopied(true);
      setTimeout(() => setCopied(false), 2000);
    } catch {
      const textarea = document.createElement('textarea');
      textarea.value = link;
      document.body.appendChild(textarea);
      textarea.select();
      document.execCommand('copy');
      document.body.removeChild(textarea);
      setCopied(true);
      setTimeout(() => setCopied(false), 2000);
    }
  }, [generateShareLink]);

  const handleConfirmShare = () => {
    setError('');
    if (confirmFactoryName.trim() !== factoryName?.trim()) {
      setError('工厂名称不匹配，请确认工厂名称');
      return;
    }
    if (confirmCompanyName.trim() !== recipientCompany.trim()) {
      setError('对方公司名称不匹配，请确认对方公司名称');
      return;
    }
    // 验证通过，显示分享链接
    setShowConfirm(false);
  };

  const resetConfirm = () => {
    setShowConfirm(false);
    setConfirmFactoryName('');
    setConfirmCompanyName('');
    setError('');
  };

  if (!isOpen) return null;

  const link = generateShareLink();
  const factoryLabel = factoryType === 'textile' ? '织布厂' : '水洗厂';

  return (
    <div className="fixed inset-0 bg-black/50 backdrop-blur-sm flex items-center justify-center z-50 p-3 sm:p-4">
      <motion.div
        initial={{ opacity: 0, scale: 0.95 }}
        animate={{ opacity: 1, scale: 1 }}
        exit={{ opacity: 0, scale: 0.95 }}
        className="bg-white rounded-2xl p-4 sm:p-6 w-full max-w-md shadow-2xl"
      >
        {!showConfirm ? (
          <>
            <div className="flex items-center gap-2 sm:gap-3 mb-3 sm:mb-4">
              <div className="w-9 h-9 sm:w-10 sm:h-10 bg-blue-100 rounded-xl flex items-center justify-center flex-shrink-0">
                <Share2 className="w-4 h-4 sm:w-5 sm:h-5 text-blue-600" />
              </div>
              <div className="min-w-0">
                <h3 className="text-base sm:text-lg font-semibold text-gray-900">分享链接</h3>
                <p className="text-xs sm:text-sm text-gray-500">发送给{factoryLabel}</p>
              </div>
            </div>

            <div className="bg-gray-50 rounded-xl p-2.5 sm:p-3 mb-3 sm:mb-4 border border-gray-200">
              <p className="text-xs sm:text-sm text-gray-700 break-all font-mono">{link}</p>
            </div>

            <div className="flex gap-2 sm:gap-3">
              <button
                onClick={onClose}
                className="flex-1 py-2 sm:py-2.5 border border-gray-300 rounded-xl text-gray-700 hover:bg-gray-50 text-xs sm:text-sm font-medium transition-colors"
              >
                关闭
              </button>
              <button
                onClick={handleCopy}
                className={`flex-1 py-2 sm:py-2.5 rounded-xl text-white flex items-center justify-center gap-1.5 sm:gap-2 transition-colors text-xs sm:text-sm font-medium ${
                  copied ? 'bg-emerald-500' : 'bg-blue-600 hover:bg-blue-700'
                }`}
              >
                {copied ? <Check size={isMobile ? 14 : 16} /> : <Copy size={isMobile ? 14 : 16} />}
                {copied ? '已复制' : '复制链接'}
              </button>
            </div>
          </>
        ) : (
          <>
            <div className="flex items-center gap-2 sm:gap-3 mb-4">
              <div className="w-9 h-9 sm:w-10 sm:h-10 bg-amber-100 rounded-xl flex items-center justify-center flex-shrink-0">
                <AlertTriangle className="w-4 h-4 sm:w-5 sm:h-5 text-amber-600" />
              </div>
              <div className="min-w-0">
                <h3 className="text-base sm:text-lg font-semibold text-gray-900">二次确认</h3>
                <p className="text-xs sm:text-sm text-gray-500">请确认分享信息</p>
              </div>
            </div>

            <div className="space-y-3 mb-4">
              <div className="bg-blue-50 rounded-xl p-3 border border-blue-100">
                <div className="flex items-center gap-2 mb-1">
                  <Building2 className="w-4 h-4 text-blue-600" />
                  <span className="text-xs text-blue-600 font-medium">目标工厂</span>
                </div>
                <p className="text-sm text-gray-900 font-medium">{factoryName || '未指定'}</p>
              </div>

              <div className="bg-green-50 rounded-xl p-3 border border-green-100">
                <div className="flex items-center gap-2 mb-1">
                  <Building2 className="w-4 h-4 text-green-600" />
                  <span className="text-xs text-green-600 font-medium">您的公司</span>
                </div>
                <p className="text-sm text-gray-900 font-medium">{recipientCompany || '加载中...'}</p>
              </div>

              <div className="space-y-2">
                <div>
                  <label className="text-xs text-gray-500 mb-1 block">请输入工厂名称确认</label>
                  <input
                    type="text"
                    value={confirmFactoryName}
                    onChange={(e) => setConfirmFactoryName(e.target.value)}
                    placeholder="输入工厂名称"
                    className="w-full px-3 py-2 border border-gray-200 rounded-lg text-sm focus:ring-2 focus:ring-amber-500/20 focus:border-amber-500"
                  />
                </div>
                <div>
                  <label className="text-xs text-gray-500 mb-1 block">请输入对方公司名称确认</label>
                  <input
                    type="text"
                    value={confirmCompanyName}
                    onChange={(e) => setConfirmCompanyName(e.target.value)}
                    placeholder="输入对方公司名称"
                    className="w-full px-3 py-2 border border-gray-200 rounded-lg text-sm focus:ring-2 focus:ring-amber-500/20 focus:border-amber-500"
                  />
                </div>
              </div>

              {error && (
                <div className="bg-red-50 rounded-lg p-2 border border-red-100">
                  <p className="text-xs text-red-600">{error}</p>
                </div>
              )}
            </div>

            <div className="flex gap-2 sm:gap-3">
              <button
                onClick={resetConfirm}
                className="flex-1 py-2 sm:py-2.5 border border-gray-300 rounded-xl text-gray-700 hover:bg-gray-50 text-xs sm:text-sm font-medium transition-colors"
              >
                返回
              </button>
              <button
                onClick={handleConfirmShare}
                className="flex-1 py-2 sm:py-2.5 bg-amber-500 hover:bg-amber-600 rounded-xl text-white text-xs sm:text-sm font-medium transition-colors"
              >
                确认分享
              </button>
            </div>
          </>
        )}
      </motion.div>
    </div>
  );
}