import React, { useState, useCallback, useMemo, useEffect } from 'react';
import { useNavigate, useSearchParams } from 'react-router-dom';
import { useAuth } from '../../contexts/AuthContext';
import { usePlanData } from '../../hooks/usePlanData';
import { useResponsive } from '../../hooks/useResponsive';
import { motion } from 'framer-motion';
import { ArrowLeft, Search, Factory, Droplets, Share2 } from 'lucide-react';
import { PlanGroup } from '../../components/plans/PlanGroup';
import { ShareModal } from '../../components/plans/ShareModal';
import { statusMap } from '../../utils/constants';
import { calculateProgress } from '../../utils/helpers';
import type { PlanWithSteps } from '../../types';

export function PlanOverview() {
  const navigate = useNavigate();
  const [searchParams] = useSearchParams();
  const { auth } = useAuth();
  const { isMobile } = useResponsive();

  // 从 URL 获取过滤参数
  const statusFilter = searchParams.get('filter') as 'all' | 'producing' | 'completed' | null;

  // Tab 状态
  const [activeTab, setActiveTab] = useState<'textile' | 'washing'>('textile');

  // 搜索
  const [searchQuery, setSearchQuery] = useState('');

  // 根据 URL 参数设置页面标题
  useEffect(() => {
    if (statusFilter) {
      const titles: Record<string, string> = {
        producing: '进行中计划',
        completed: '已完成计划'
      };
      document.title = titles[statusFilter] || '计划总览';
    }
  }, [statusFilter]);

  // 展开状态
  const [expandedGroups, setExpandedGroups] = useState<Set<string>>(new Set());
  const [expandedPlan, setExpandedPlan] = useState<string | null>(null);

  // 分享弹窗
  const [shareModal, setShareModal] = useState<{ planId: string; type: 'textile' | 'washing' } | null>(null);

  // 使用优化的数据获取 Hook
  const {
    plans,
    factories,
    planFactories,
    operatorNames,
    loading,
    loadingMore,
    hasMore,
    loadMore,
    refetch
  } = usePlanData({
    companyId: auth.company?.id || null,
    pageSize: 20
  });

  // 根据状态过滤计划 - 必须在 getPlansForFactory 之前声明
  const filteredPlansByStatus = useMemo(() => {
    if (!statusFilter || statusFilter === 'all') return plans;
    return plans.filter(p => p.status === statusFilter);
  }, [plans, statusFilter]);

  // 筛选工厂
  const filteredFactories = useMemo(() =>
    factories.filter(f =>
      activeTab === 'textile' ? f.role === 'textile' : f.role === 'washing'
    ),
    [factories, activeTab]
  );

  // 获取工厂的计划
  const getPlansForFactory = useCallback((factoryId: string) => {
    const planIds = planFactories
      .filter(pf => pf.factory_id === factoryId)
      .map(pf => pf.plan_id);
    return filteredPlansByStatus.filter(p => planIds.includes(p.id));
  }, [planFactories, filteredPlansByStatus]);

  // 搜索过滤
  const filterPlansBySearch = useCallback((plans: PlanWithSteps[]) => {
    if (!searchQuery) return plans;
    const query = searchQuery.toLowerCase();
    return plans.filter(p =>
      p.product_name.toLowerCase().includes(query) ||
      p.fabric_code.toLowerCase().includes(query) ||
      p.plan_code.toLowerCase().includes(query)
    );
  }, [searchQuery]);

  // 未关联的计划
  const unlinkedPlans = useMemo(() =>
    filteredPlansByStatus.filter(p =>
      !planFactories.some(pf =>
        pf.plan_id === p.id && pf.factory_type === activeTab
      )
    ),
    [filteredPlansByStatus, planFactories, activeTab]
  );

  // 切换分组展开
  const toggleGroup = useCallback((groupId: string) => {
    setExpandedGroups(prev => {
      const next = new Set(prev);
      if (next.has(groupId)) next.delete(groupId);
      else next.add(groupId);
      return next;
    });
  }, []);

  // 切换计划展开
  const togglePlan = useCallback((planId: string) => {
    setExpandedPlan(prev => prev === planId ? null : planId);
  }, []);

  // 打开分享弹窗
  const openShareModal = useCallback((planId: string, type: 'textile' | 'washing') => {
    setShareModal({ planId, type });
  }, []);

  // 关闭分享弹窗
  const closeShareModal = useCallback(() => {
    setShareModal(null);
  }, []);

  if (loading) {
    return (
      <div className="min-h-screen bg-gray-50 flex items-center justify-center">
        <div className="flex flex-col items-center gap-3">
          <div className="w-8 h-8 border-2 border-blue-500 border-t-transparent rounded-full animate-spin" />
          <p className="text-gray-500 text-sm">加载中...</p>
        </div>
      </div>
    );
  }

  return (
    <div className="min-h-screen bg-gray-50">
      {/* Header */}
      <header className="bg-white border-b border-gray-200 sticky top-0 z-10">
        <div className="max-w-7xl mx-auto px-3 sm:px-4 md:px-8 py-3 sm:py-4">
          <div className="flex items-center gap-3 sm:gap-4">
            <button
              onClick={() => navigate('/purchaser')}
              className="p-2 hover:bg-gray-100 rounded-lg transition-colors"
            >
              <ArrowLeft className="w-5 h-5 text-gray-600" />
            </button>
            <h1 className="text-lg sm:text-xl font-bold text-gray-900">
              {statusFilter === 'producing' ? '进行中计划' : statusFilter === 'completed' ? '已完成计划' : '计划总览'}
            </h1>
            {statusFilter && (
              <button
                onClick={() => navigate('/purchaser/plans')}
                className="text-xs text-blue-600 hover:text-blue-700 underline"
              >
                查看全部
              </button>
            )}
          </div>
        </div>
      </header>

      <div className="max-w-7xl mx-auto px-3 sm:px-4 md:px-8 py-4 sm:py-6">
        {/* Tab 切换 */}
        <div className="flex gap-2 mb-4 sm:mb-6">
          <button
            onClick={() => setActiveTab('textile')}
            className={`flex items-center gap-2 px-4 sm:px-6 py-2.5 sm:py-3 rounded-xl font-medium text-sm transition-all flex-1 sm:flex-none justify-center ${
              activeTab === 'textile'
                ? 'bg-blue-600 text-white shadow-md shadow-blue-500/20'
                : 'bg-white text-gray-600 hover:bg-gray-50 border border-gray-200'
            }`}
          >
            <Factory size={isMobile ? 16 : 18} />
            <span className="whitespace-nowrap">织布厂</span>
          </button>
          <button
            onClick={() => setActiveTab('washing')}
            className={`flex items-center gap-2 px-4 sm:px-6 py-2.5 sm:py-3 rounded-xl font-medium text-sm transition-all flex-1 sm:flex-none justify-center ${
              activeTab === 'washing'
                ? 'bg-blue-600 text-white shadow-md shadow-blue-500/20'
                : 'bg-white text-gray-600 hover:bg-gray-50 border border-gray-200'
            }`}
          >
            <Droplets size={isMobile ? 16 : 18} />
            <span className="whitespace-nowrap">水洗厂</span>
          </button>
        </div>

        {/* 搜索栏 */}
        <div className="mb-4 sm:mb-6">
          <div className="relative">
            <Search className="absolute left-3 top-1/2 -translate-y-1/2 w-4 sm:w-5 h-4 sm:h-5 text-gray-400" />
            <input
              type="text"
              value={searchQuery}
              onChange={(e) => setSearchQuery(e.target.value)}
              placeholder="搜索产品名称、坯布码、计划编号..."
              className="w-full pl-9 sm:pl-10 pr-4 py-2.5 sm:py-3 bg-white border border-gray-200 rounded-xl focus:ring-2 focus:ring-blue-500/20 focus:border-blue-500 transition-all text-sm sm:text-base"
            />
          </div>
        </div>

        {/* 已关联工厂的计划 */}
        {filteredFactories.length > 0 && (
          <div className="space-y-4 mb-6">
            {filteredFactories.map(factory => {
              const factoryPlans = filterPlansBySearch(getPlansForFactory(factory.id));
              if (factoryPlans.length === 0 && searchQuery) return null;

              return (
                <PlanGroup
                  key={factory.id}
                  factory={factory}
                  plans={factoryPlans}
                  isExpanded={expandedGroups.has(factory.id)}
                  expandedPlan={expandedPlan}
                  onToggleGroup={() => toggleGroup(factory.id)}
                  onTogglePlan={togglePlan}
                  onShare={(planId) => openShareModal(planId, activeTab)}
                  onPlanUpdated={refetch}
                  operatorNames={operatorNames}
                />
              );
            })}
          </div>
        )}

        {/* 未关联工厂的计划 */}
        {unlinkedPlans.length > 0 && (
          <UnlinkedPlansSection
            plans={filterPlansBySearch(unlinkedPlans)}
            activeTab={activeTab}
            onShare={openShareModal}
          />
        )}

        {/* 加载更多 */}
        {hasMore && (
          <div className="text-center py-4">
            <button
              onClick={loadMore}
              disabled={loadingMore}
              className="px-4 py-2 bg-white border border-gray-200 text-gray-600 rounded-lg hover:bg-gray-50 disabled:opacity-50 text-sm"
            >
              {loadingMore ? '加载中...' : '加载更多'}
            </button>
          </div>
        )}

        {/* 空状态 */}
        {plans.length === 0 && (
          <div className="text-center py-12 sm:py-16">
            <div className="w-14 h-14 sm:w-16 sm:h-16 bg-gray-100 rounded-2xl flex items-center justify-center mx-auto mb-4">
              <Factory className="w-7 h-7 sm:w-8 sm:h-8 text-gray-400" />
            </div>
            <h3 className="text-base sm:text-lg font-medium text-gray-900 mb-2">暂无计划</h3>
            <p className="text-sm text-gray-500 mb-4">请先创建计划</p>
            <button
              onClick={() => navigate('/purchaser/plans/new')}
              className="px-4 py-2 bg-blue-600 text-white rounded-lg hover:bg-blue-700 transition-colors text-sm sm:text-base"
            >
              创建计划
            </button>
          </div>
        )}
      </div>

      {/* 分享弹窗 */}
      {shareModal && (
        <ShareModal
          isOpen={true}
          onClose={closeShareModal}
          planId={shareModal.planId}
          factoryType={shareModal.type}
        />
      )}
    </div>
  );
}

// 未关联计划区域组件
interface UnlinkedPlansSectionProps {
  plans: PlanWithSteps[];
  activeTab: 'textile' | 'washing';
  onShare: (planId: string, type: 'textile' | 'washing') => void;
}

function UnlinkedPlansSection({ plans, activeTab, onShare }: UnlinkedPlansSectionProps) {
  const { isMobile } = useResponsive();
  const factoryLabel = activeTab === 'textile' ? '织布厂' : '水洗厂';

  return (
    <motion.div
      initial={{ opacity: 0, y: 10 }}
      animate={{ opacity: 1, y: 0 }}
      className="bg-gradient-to-br from-blue-50 to-indigo-50 rounded-2xl border border-blue-200 overflow-hidden mb-4 sm:mb-6"
    >
      <div className="p-3 sm:p-4 bg-white/50 border-b border-blue-100">
        <div className="flex items-center gap-2">
          <div className="w-7 h-7 sm:w-8 sm:h-8 bg-blue-100 rounded-lg flex items-center justify-center flex-shrink-0">
            <Share2 className="w-3.5 h-3.5 sm:w-4 sm:h-4 text-blue-600" />
          </div>
          <div className="min-w-0">
            <h3 className="font-semibold text-blue-900 text-sm sm:text-base">
              待关联{factoryLabel}的计划
            </h3>
            <p className="text-xs sm:text-sm text-blue-600">
              点击"分享链接"发送给{factoryLabel}，对方确认后即可关联
            </p>
          </div>
        </div>
      </div>
      <div className="p-3 sm:p-4 space-y-2 sm:space-y-3">
        {plans.map(plan => {
          const status = statusMap[plan.status] || statusMap.pending;
          const progress = calculateProgress(plan.completed_quantity, plan.target_quantity);

          return (
            <div key={plan.id} className="bg-white rounded-xl p-3 sm:p-4 border border-blue-100 hover:border-blue-300 transition-colors">
              <div className="flex items-start justify-between gap-2 sm:gap-4">
                <div className="flex-1 min-w-0">
                  <div className="flex items-center gap-1.5 sm:gap-2 mb-1">
                    <h4 className="font-medium text-gray-900 text-sm sm:text-base truncate">
                      {plan.product_name}-{plan.color}
                    </h4>
                    <span className={`px-1.5 sm:px-2 py-0.5 text-xs font-medium rounded-full flex-shrink-0 ${status.bgColor} ${status.color} border ${status.borderColor}`}>
                      {status.label}
                    </span>
                  </div>
                  <p className="text-xs sm:text-sm text-gray-500">{plan.fabric_code}-{plan.color_code}</p>
                  <p className="text-xs text-gray-400 mt-0.5">{plan.plan_code}</p>
                </div>
                <button
                  onClick={() => onShare(plan.id, activeTab)}
                  className="flex items-center gap-1 px-2 sm:px-3 py-1.5 text-xs sm:text-sm bg-blue-600 text-white rounded-lg hover:bg-blue-700 transition-colors shadow-sm flex-shrink-0"
                >
                  <Share2 size={isMobile ? 12 : 14} />
                  分享链接
                </button>
              </div>
              <div className="mt-2 sm:mt-3">
                <div className="flex items-center justify-between text-xs text-gray-500 mb-1">
                  <span>生产进度</span>
                  <span className="font-medium">{progress}%</span>
                </div>
                <div className="h-1.5 bg-gray-100 rounded-full overflow-hidden">
                  <div className="h-full bg-blue-500 rounded-full" style={{ width: `${progress}%` }} />
                </div>
              </div>
            </div>
          );
        })}
      </div>
    </motion.div>
  );
}
