import { useEffect, useState, useCallback } from 'react';
import {
  Card,
  Row,
  Col,
  Input,
  Tag,
  Button,
  Space,
  Typography,
  Modal,
  Rate,
  message,
  Empty,
  Tooltip,
  Form,
  Input as TextArea,
  Alert,
  Spin,
} from 'antd';
import {
  SearchOutlined,
  DownloadOutlined,
  AppstoreOutlined,
  StarOutlined,
} from '@ant-design/icons';
import {
  listMarketEntries,
  installFromMarket,
  listMarketReviews,
  submitMarketReview,
  listPlugins,
  type MarketEntry,
  type MarketReview,
} from '../api/plugins';

const { Title, Text, Paragraph } = Typography;

const CATEGORY_COLORS: Record<string, string> = {
  '财务': '#059669',
  'CRM': '#2563EB',
  '进销存': '#9333EA',
  '生产': '#dc2626',
  '人力资源': '#d97706',
  '基础': '#475569',
};

export default function PluginMarket() {
  const [plugins, setPlugins] = useState<MarketEntry[]>([]);
  const [loading, setLoading] = useState(true);
  const [searchText, setSearchText] = useState('');
  const [selectedCategory, setSelectedCategory] = useState<string | null>(null);
  const [detailVisible, setDetailVisible] = useState(false);
  const [selectedPlugin, setSelectedPlugin] = useState<MarketEntry | null>(null);
  const [installing, setInstalling] = useState<string | null>(null);

  // 当前已安装的插件列表（用于标识已安装状态）
  const [installedIds, setInstalledIds] = useState<Set<string>>(new Set());

  // 评论区
  const [reviews, setReviews] = useState<MarketReview[]>([]);
  const [reviewForm] = Form.useForm();
  const [submittingReview, setSubmittingReview] = useState(false);

  const fetchInstalled = useCallback(async () => {
    try {
      const result = await listPlugins(1);
      const ids = new Set(result.data.map((p) => p.id));
      setInstalledIds(ids);
    } catch {
      // 静默失败
    }
  }, []);

  const loadMarketPlugins = useCallback(async () => {
    setLoading(true);
    try {
      const result = await listMarketEntries({ search: searchText || undefined, category: selectedCategory || undefined });
      setPlugins(result.data);
    } catch {
      message.error('加载插件市场失败');
    }
    setLoading(false);
  }, [searchText, selectedCategory]);

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

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

  const categories = Array.from(new Set(plugins.map((p) => p.category).filter((c): c is string => Boolean(c))));

  const showDetail = async (plugin: MarketEntry) => {
    setSelectedPlugin(plugin);
    setDetailVisible(true);
    try {
      const result = await listMarketReviews(plugin.id);
      setReviews(result);
    } catch {
      setReviews([]);
    }
  };

  const handleInstall = async (plugin: MarketEntry) => {
    setInstalling(plugin.id);
    try {
      await installFromMarket(plugin.id);
      message.success(`${plugin.name} 安装成功`);
      fetchInstalled();
      loadMarketPlugins();
    } catch (e: unknown) {
      const msg = e instanceof Error ? e.message : '安装失败';
      message.error(msg);
    }
    setInstalling(null);
  };

  const handleSubmitReview = async () => {
    if (!selectedPlugin) return;
    try {
      const values = await reviewForm.validateFields();
      setSubmittingReview(true);
      await submitMarketReview(selectedPlugin.id, values);
      message.success('评分提交成功');
      reviewForm.resetFields();
      // 刷新评论和列表
      const result = await listMarketReviews(selectedPlugin.id);
      setReviews(result);
      loadMarketPlugins();
    } catch {
      // 表单验证失败静默
    }
    setSubmittingReview(false);
  };

  return (
    <div style={{ padding: 24 }}>
      <div style={{ marginBottom: 24 }}>
        <Title level={3} style={{ marginBottom: 8 }}>
          <AppstoreOutlined /> 插件市场
        </Title>
        <Text type="secondary">发现和安装行业插件，扩展 ERP 能力</Text>
      </div>

      {/* 搜索和分类 */}
      <div style={{ marginBottom: 24 }}>
        <Space size="middle" wrap>
          <Input
            prefix={<SearchOutlined />}
            placeholder="搜索插件..."
            value={searchText}
            onChange={(e) => setSearchText(e.target.value)}
            style={{ width: 300 }}
            allowClear
          />
          <Button
            type={selectedCategory === null ? 'primary' : 'default'}
            onClick={() => setSelectedCategory(null)}
          >
            全部
          </Button>
          {categories.map((cat) => (
            <Button
              key={cat}
              type={selectedCategory === cat ? 'primary' : 'default'}
              onClick={() => setSelectedCategory(selectedCategory === cat ? null : cat)}
            >
              {cat}
            </Button>
          ))}
        </Space>
      </div>

      {/* 插件卡片网格 */}
      <Spin spinning={loading}>
        {plugins.length === 0 && !loading ? (
          <Empty description="暂无可用插件" />
        ) : (
          <Row gutter={[16, 16]}>
            {plugins.map((plugin) => (
              <Col xs={24} sm={12} md={8} lg={6} key={plugin.id}>
                <Card
                  hoverable
                  onClick={() => showDetail(plugin)}
                  style={{ height: '100%' }}
                >
                  <div style={{ marginBottom: 8 }}>
                    <Text strong style={{ fontSize: 16 }}>{plugin.name}</Text>
                    <Tag
                      color={CATEGORY_COLORS[plugin.category ?? ''] ?? '#475569'}
                      style={{ marginLeft: 8 }}
                    >
                      {plugin.category}
                    </Tag>
                  </div>
                  <Paragraph
                    type="secondary"
                    ellipsis={{ rows: 2 }}
                    style={{ minHeight: 44, marginBottom: 8 }}
                  >
                    {plugin.description ?? '暂无描述'}
                  </Paragraph>
                  <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
                    <Space size="small">
                      <Text type="secondary" style={{ fontSize: 12 }}>v{plugin.version}</Text>
                      {plugin.author && <Text type="secondary" style={{ fontSize: 12 }}>{plugin.author}</Text>}
                    </Space>
                    <Tooltip title="评分">
                      <Space size={2}>
                        <StarOutlined style={{ color: '#faad14', fontSize: 12 }} />
                        <Text style={{ fontSize: 12 }}>
                          {plugin.rating_count > 0
                            ? plugin.rating_avg.toFixed(1)
                            : '-'}
                        </Text>
                      </Space>
                    </Tooltip>
                  </div>
                  {installedIds.has(plugin.plugin_id) && (
                    <Tag color="green" style={{ marginTop: 8 }}>已安装</Tag>
                  )}
                </Card>
              </Col>
            ))}
          </Row>
        )}
      </Spin>

      {/* 详情弹窗 */}
      <Modal
        title={selectedPlugin?.name}
        open={detailVisible}
        onCancel={() => {
          setDetailVisible(false);
          reviewForm.resetFields();
        }}
        footer={null}
        width={640}
      >
        {selectedPlugin && (
          <div>
            <div style={{ marginBottom: 16 }}>
              <Space>
                <Tag color={CATEGORY_COLORS[selectedPlugin.category ?? ''] ?? '#475569'}>
                  {selectedPlugin.category}
                </Tag>
                <Text type="secondary">v{selectedPlugin.version}</Text>
                <Text type="secondary">by {selectedPlugin.author ?? '未知'}</Text>
                <Text type="secondary">
                  <DownloadOutlined /> {selectedPlugin.download_count} 次下载
                </Text>
              </Space>
            </div>
            <Paragraph>{selectedPlugin.description ?? '暂无描述'}</Paragraph>

            {selectedPlugin.changelog && (
              <div style={{ marginBottom: 16 }}>
                <Text strong>更新日志</Text>
                <Paragraph type="secondary" style={{ whiteSpace: 'pre-wrap' }}>
                  {selectedPlugin.changelog}
                </Paragraph>
              </div>
            )}

            {selectedPlugin.tags && selectedPlugin.tags.length > 0 && (
              <div style={{ marginBottom: 16 }}>
                {selectedPlugin.tags.map((tag) => (
                  <Tag key={tag}>{tag}</Tag>
                ))}
              </div>
            )}

            <div style={{ marginBottom: 16 }}>
              <Rate disabled value={Math.round(selectedPlugin.rating_avg)} />
              <Text type="secondary" style={{ marginLeft: 8 }}>
                {selectedPlugin.rating_count} 评分
              </Text>
            </div>

            <Button
              type="primary"
              icon={<DownloadOutlined />}
              loading={installing === selectedPlugin.id}
              disabled={installedIds.has(selectedPlugin.plugin_id)}
              onClick={() => handleInstall(selectedPlugin)}
              block
              style={{ marginBottom: 24 }}
            >
              {installedIds.has(selectedPlugin.plugin_id) ? '已安装' : '一键安装'}
            </Button>

            {/* 评论区 */}
            <div style={{ borderTop: '1px solid #f0f0f0', paddingTop: 16 }}>
              <Title level={5}>用户评价 ({reviews.length})</Title>

              {reviews.length > 0 && (
                <div style={{ marginBottom: 16, maxHeight: 200, overflowY: 'auto' }}>
                  {reviews.map((review) => (
                    <div key={review.id} style={{ marginBottom: 12, paddingBottom: 12, borderBottom: '1px solid #f5f5f5' }}>
                      <Space>
                        <Rate disabled value={review.rating} style={{ fontSize: 14 }} />
                        <Text type="secondary" style={{ fontSize: 12 }}>
                          {review.created_at ? new Date(review.created_at).toLocaleDateString() : ''}
                        </Text>
                      </Space>
                      {review.review_text && (
                        <Paragraph style={{ marginTop: 4, marginBottom: 0 }} type="secondary">
                          {review.review_text}
                        </Paragraph>
                      )}
                    </div>
                  ))}
                </div>
              )}

              {reviews.length === 0 && (
                <Alert type="info" message="暂无评价" style={{ marginBottom: 16 }} />
              )}

              {installedIds.has(selectedPlugin.plugin_id) && (
                <Form form={reviewForm} layout="vertical">
                  <Form.Item name="rating" label="评分" rules={[{ required: true, message: '请选择评分' }]}>
                    <Rate />
                  </Form.Item>
                  <Form.Item name="review_text" label="评价内容">
                    <TextArea.TextArea rows={2} placeholder="写下你的使用体验..." />
                  </Form.Item>
                  <Form.Item>
                    <Button type="primary" loading={submittingReview} onClick={handleSubmitReview}>
                      提交评价
                    </Button>
                  </Form.Item>
                </Form>
              )}
            </div>
          </div>
        )}
      </Modal>
    </div>
  );
}