import React, { useState, useEffect } from 'react';
import { Card, Typography, Button, Space, Tag, message, Empty, Radio, Popconfirm } from 'antd';
import { PlusOutlined, EyeOutlined, EditOutlined, DeleteOutlined, DownOutlined, RightOutlined, FileAddOutlined, CheckCircleOutlined, CloseCircleOutlined } from '@ant-design/icons';
import { useNavigate } from 'react-router-dom';
import axios from 'axios';
import dayjs from 'dayjs';
import { useAuthStore } from '../../store/authStore';
import QuotationCreateModal from './QuotationCreateModal';

const { Title, Paragraph, Text } = Typography;

interface Quotation {
  id: number;
  version: number;
  quotation_date: string;
  amount: number;
  currency: string;
  status: 'draft' | 'sent' | 'approved' | 'rejected';
  file_url?: string;
  remark?: string;
  created_at: string;
}

interface BudgetProject {
  id: number;
  name: string;
  customer_id: number;
  customer_name: string;
  manager_id: number;
  manager_name: string;
  location?: string;
  survey_date?: string;
  intermediary?: string;
  intermediary_fee_type?: 'fixed' | 'percentage';
  intermediary_fee_value?: number;
  customer_requirements?: string;
  project_overview?: string;
  attachments?: string[];
  survey_photos?: string[];
  status: 'negotiating' | 'signed' | 'unsigned';
  days_in_status: number;
  created_at: string;
  quotations: Quotation[];
}

type StatusFilter = 'all' | 'negotiating' | 'signed' | 'unsigned';

const CURRENCIES: Record<string, { label: string; symbol: string }> = {
  CNY: { label: '人民币', symbol: '¥' },
  USD: { label: '美元', symbol: '$' },
  LAK: { label: '老挝基普', symbol: '₭' },
  THB: { label: '泰铢', symbol: '฿' },
};

const BudgetProjectList: React.FC = () => {
  const [isMobile, setIsMobile] = useState(false);
  const [projects, setProjects] = useState<BudgetProject[]>([]);
  const [loading, setLoading] = useState(false);
  const [statusFilter, setStatusFilter] = useState<StatusFilter>('all');
  const [expandedKeys, setExpandedKeys] = useState<Set<number>>(new Set());
  const [quotationModalVisible, setQuotationModalVisible] = useState(false);
  const [selectedProject, setSelectedProject] = useState<BudgetProject | null>(null);
  const navigate = useNavigate();

  const { user: _currentUser } = useAuthStore();
  // const isAdmin = _currentUser?.role === 'admin';

  useEffect(() => {
    const checkMobile = () => setIsMobile(window.innerWidth <= 768);
    checkMobile();
    window.addEventListener('resize', checkMobile);
    return () => window.removeEventListener('resize', checkMobile);
  }, []);

  useEffect(() => {
    fetchProjects();
  }, []);

  const fetchProjects = async () => {
    setLoading(true);
    try {
      const res = await axios.get('/api/budget-projects');
      if (res.data.success) {
        setProjects(res.data.data);
      }
    } catch (error) {
      console.error('获取预算项目失败:', error);
      message.error('获取数据失败');
    } finally {
      setLoading(false);
    }
  };

  const filteredProjects = projects.filter(p => 
    statusFilter === 'all' || p.status === statusFilter
  );

  const toggleExpand = (id: number) => {
    const newSet = new Set(expandedKeys);
    if (newSet.has(id)) {
      newSet.delete(id);
    } else {
      newSet.add(id);
    }
    setExpandedKeys(newSet);
  };

  const getStatusTag = (status: string) => {
    const statusMap: Record<string, { color: string; text: string }> = {
      negotiating: { color: 'processing', text: '商谈中' },
      signed: { color: 'success', text: '已签约' },
      unsigned: { color: 'error', text: '未签约' },
    };
    const config = statusMap[status] || { color: 'default', text: status };
    return <Tag color={config.color}>{config.text}</Tag>;
  };

  const getQuotationStatusTag = (status: string) => {
    const statusMap: Record<string, { color: string; text: string }> = {
      draft: { color: 'default', text: '草稿' },
      sent: { color: 'processing', text: '已发送' },
      approved: { color: 'success', text: '已通过' },
      rejected: { color: 'error', text: '已拒绝' },
    };
    const config = statusMap[status] || { color: 'default', text: status };
    return <Tag color={config.color}>{config.text}</Tag>;
  };

  const formatAmount = (amount: number, currency: string = 'CNY') => {
    const c = CURRENCIES[currency];
    const symbol = c?.symbol || '¥';
    return `${symbol}${amount.toLocaleString('zh-CN')}`;
  };

  const handleSign = async (projectId: number) => {
    try {
      const res = await axios.put(`/api/budget-projects/${projectId}/sign`);
      if (res.data.success) {
        message.success('标记签约成功');
        fetchProjects();
      }
    } catch (error) {
      message.error('操作失败');
    }
  };

  const handleUnsigned = async (projectId: number) => {
    try {
      const res = await axios.put(`/api/budget-projects/${projectId}/unsigned`);
      if (res.data.success) {
        message.success('标记未签约成功');
        fetchProjects();
      }
    } catch (error) {
      message.error('操作失败');
    }
  };

  const handleDeleteQuotation = async (projectId: number, quotationId: number) => {
    try {
      const res = await axios.delete(`/api/budget-projects/${projectId}/quotations/${quotationId}`);
      if (res.data.success) {
        message.success('删除成功');
        fetchProjects();
      }
    } catch (error) {
      message.error('删除失败');
    }
  };

  const openQuotationModal = (project: BudgetProject) => {
    setSelectedProject(project);
    setQuotationModalVisible(true);
  };

  const handleQuotationSuccess = () => {
    setQuotationModalVisible(false);
    fetchProjects();
  };

  const goToProjectManagement = (projectId: number) => {
    navigate(`/projects/${projectId}`);
  };

  return (
    <div style={{ padding: isMobile ? 8 : 24 }}>
      <div style={{ marginBottom: isMobile ? 12 : 24 }}>
        <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', flexWrap: 'wrap', gap: 12 }}>
          <div>
            <Title level={isMobile ? 3 : 2} style={{ marginBottom: 8 }}>预算报价管理</Title>
            <Paragraph type="secondary" style={{ marginBottom: 0 }}>管理商谈项目及报价版本</Paragraph>
          </div>
          <Button 
            type="primary" 
            icon={<PlusOutlined />} 
            onClick={() => navigate('/budget-projects/create')}
            size={isMobile ? 'middle' : 'large'}
          >
            新建商谈项目
          </Button>
        </div>
      </div>

      {/* 状态筛选 */}
      <Card style={{ marginBottom: 16 }}>
        <Space>
          <Text strong>状态筛选:</Text>
          <Radio.Group 
            value={statusFilter} 
            onChange={(e) => setStatusFilter(e.target.value)}
            optionType="button"
            buttonStyle="solid"
          >
            <Radio.Button value="all">全部</Radio.Button>
            <Radio.Button value="negotiating">商谈中</Radio.Button>
            <Radio.Button value="signed">已签约</Radio.Button>
            <Radio.Button value="unsigned">未签约</Radio.Button>
          </Radio.Group>
        </Space>
      </Card>

      {/* 项目列表 */}
      <Card loading={loading}>
        {filteredProjects.length === 0 ? (
          <Empty description="暂无数据" />
        ) : (
          <div>
            {filteredProjects.map((project) => (
              <div 
                key={project.id} 
                style={{ 
                  border: '1px solid #f0f0f0', 
                  borderRadius: 8, 
                  marginBottom: 16,
                  overflow: 'hidden'
                }}
              >
                {/* 项目头部 */}
                <div 
                  style={{ 
                    padding: '16px 20px', 
                    background: '#fafafa',
                    borderBottom: expandedKeys.has(project.id) ? '1px solid #f0f0f0' : 'none',
                    cursor: 'pointer'
                  }}
                  onClick={() => toggleExpand(project.id)}
                >
                  <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'flex-start', flexWrap: 'wrap', gap: 12 }}>
                    <Space size="middle">
                      {expandedKeys.has(project.id) ? <DownOutlined /> : <RightOutlined />}
                      <Text strong style={{ fontSize: 16 }}>{project.name}</Text>
                    </Space>
                    <Space>
                      {getStatusTag(project.status)}
                      <Text type="secondary">{project.days_in_status}天</Text>
                    </Space>
                  </div>
                  
                  <div style={{ marginTop: 12, marginLeft: 28 }}>
                    <Space direction="vertical" size={4} style={{ width: '100%' }}>
                      <Text type="secondary">客户: {project.customer_name}</Text>
                      <Text type="secondary">业务经理: {project.manager_name}</Text>
                      {project.intermediary && (
                        <Text type="secondary">
                          居间人: {project.intermediary}
                          {project.intermediary_fee_value && (
                            <span> 居间费: {formatAmount(project.intermediary_fee_value, 'CNY')}</span>
                          )}
                        </Text>
                      )}
                    </Space>
                  </div>
                </div>

                {/* 展开内容 - 报价版本 */}
                {expandedKeys.has(project.id) && (
                  <div style={{ padding: '16px 20px', background: '#fff' }}>
                    {project.quotations && project.quotations.length > 0 ? (
                      <div style={{ marginLeft: 28 }}>
                        {project.quotations.map((quotation, index) => (
                          <div 
                            key={quotation.id}
                            style={{ 
                              display: 'flex', 
                              justifyContent: 'space-between', 
                              alignItems: 'center',
                              padding: '12px 0',
                              borderBottom: index < project.quotations.length - 1 ? '1px solid #f0f0f0' : 'none'
                            }}
                          >
                            <Space size="large">
                              <Text>报价V{quotation.version}</Text>
                              <Text type="secondary">{dayjs(quotation.quotation_date).format('YYYY-MM-DD')}</Text>
                              <Text strong>{formatAmount(quotation.amount, quotation.currency)}</Text>
                              {getQuotationStatusTag(quotation.status)}
                            </Space>
                            <Space>
                              <Button 
                                size="small" 
                                icon={<EyeOutlined />}
                                onClick={() => window.open(quotation.file_url, '_blank')}
                                disabled={!quotation.file_url}
                              >
                                查看
                              </Button>
                              {quotation.status === 'draft' && (
                                <Button 
                                  size="small" 
                                  icon={<EditOutlined />}
                                >
                                  编辑
                                </Button>
                              )}
                              <Popconfirm
                                title="确定删除此报价版本吗？"
                                onConfirm={() => handleDeleteQuotation(project.id, quotation.id)}
                              >
                                <Button size="small" danger icon={<DeleteOutlined />}>删除</Button>
                              </Popconfirm>
                            </Space>
                          </div>
                        ))}
                      </div>
                    ) : (
                      <Empty description="暂无报价版本" image={Empty.PRESENTED_IMAGE_SIMPLE} />
                    )}

                    {/* 操作按钮 */}
                    {project.status === 'negotiating' && (
                      <div style={{ marginTop: 16, marginLeft: 28 }}>
                        <Space>
                          <Button 
                            icon={<FileAddOutlined />}
                            onClick={() => openQuotationModal(project)}
                          >
                            新增报价版本
                          </Button>
                          <Button 
                            type="primary" 
                            icon={<CheckCircleOutlined />}
                            onClick={() => handleSign(project.id)}
                          >
                            标记签约
                          </Button>
                          <Button 
                            danger 
                            icon={<CloseCircleOutlined />}
                            onClick={() => handleUnsigned(project.id)}
                          >
                            标记未签约
                          </Button>
                        </Space>
                      </div>
                    )}

                    {project.status === 'signed' && (
                      <div style={{ marginTop: 16, marginLeft: 28 }}>
                        <Space>
                          <Button 
                            icon={<EyeOutlined />}
                            onClick={() => {
                              const latestQuotation = project.quotations[project.quotations.length - 1];
                              if (latestQuotation?.file_url) {
                                window.open(latestQuotation.file_url, '_blank');
                              }
                            }}
                          >
                            查看
                          </Button>
                          <Button 
                            type="primary"
                            onClick={() => goToProjectManagement(project.id)}
                          >
                            进入项目管理
                          </Button>
                        </Space>
                      </div>
                    )}
                  </div>
                )}
              </div>
            ))}
          </div>
        )}
      </Card>

      {/* 新增报价版本弹窗 */}
      <QuotationCreateModal
        visible={quotationModalVisible}
        project={selectedProject}
        onCancel={() => setQuotationModalVisible(false)}
        onSuccess={handleQuotationSuccess}
      />
    </div>
  );
};

export default BudgetProjectList;