import { createClient } from '@clickhouse/client';
import type { EventsQueryParams } from './types';

// ClickHouse 客户端配置
const clickhouse = createClient({
  url: process.env.CLICKHOUSE_URL,
  username: process.env.CLICKHOUSE_USER ,
  password: process.env.CLICKHOUSE_PASSWORD ,
  database: process.env.CLICKHOUSE_DATABASE 
});

// 构建日期过滤条件
function buildDateFilter(startTime?: string, endTime?: string): string {
  const filters = [];
  
  if (startTime) {
    filters.push(`event_time >= parseDateTimeBestEffort('${startTime}')`);
  }
  
  if (endTime) {
    filters.push(`event_time <= parseDateTimeBestEffort('${endTime}')`);
  }
  
  return filters.length > 0 ? `WHERE ${filters.join(' AND ')}` : '';
}

// 构建通用过滤条件
export function buildFilter(params: Partial<EventsQueryParams>): string {
  const filters = [];
  
  // 添加日期过滤条件
  if (params.startTime || params.endTime) {
    const dateFilter = buildDateFilter(params.startTime, params.endTime);
    if (dateFilter) {
      filters.push(dateFilter.replace('WHERE ', ''));
    }
  }
  
  // 添加事件类型过滤条件
  if (params.eventType) {
    filters.push(`event_type = '${params.eventType}'`);
  }
  
  // 添加链接ID过滤条件
  if (params.linkId) {
    filters.push(`link_id = '${params.linkId}'`);
  }
  
  // 添加链接Slug过滤条件
  if (params.linkSlug) {
    filters.push(`link_slug = '${params.linkSlug}'`);
  }
  
  // 添加用户ID过滤条件
  if (params.userId) {
    filters.push(`user_id = '${params.userId}'`);
  }
  
  // 添加团队ID过滤条件
  if (params.teamId) {
    filters.push(`team_id = '${params.teamId}'`);
  }
  
  // 处理多个团队ID
  if (params.teamIds && params.teamIds.length > 0) {
    filters.push(`team_id IN (${params.teamIds.map(id => `'${id}'`).join(', ')})`);
  }
  
  // 添加项目ID过滤条件
  if (params.projectId) {
    filters.push(`project_id = '${params.projectId}'`);
  }
  
  // 处理多个项目ID
  if (params.projectIds && params.projectIds.length > 0) {
    filters.push(`project_id IN (${params.projectIds.map(id => `'${id}'`).join(', ')})`);
  }
  
  // 处理标签过滤 - 使用LIKE来匹配标签字符串
  if (params.tagIds && params.tagIds.length > 0) {
    const tagConditions = params.tagIds.map(tag => 
      `link_tags LIKE '%${tag}%'`
    );
    filters.push(`(${tagConditions.join(' OR ')})`);
  }
  
  return filters.length > 0 ? `WHERE ${filters.join(' AND ')}` : '';
}

// 构建分页条件
export function buildPagination(page: number = 1, pageSize: number = 20): string {
  const offset = (page - 1) * pageSize;
  return `LIMIT ${pageSize} OFFSET ${offset}`;
}

// 构建排序条件
export function buildOrderBy(sortBy: string = 'event_time', sortOrder: string = 'desc'): string {
  return `ORDER BY ${sortBy} ${sortOrder}`;
}

// 执行查询
export async function executeQuery(query: string) {
  console.log('执行查询:', query); // 查询日志
  try {
    const resultSet = await clickhouse.query({
      query,
      format: 'JSONEachRow',
    });
    
    const rows = await resultSet.json();
    return rows;
  } catch (error) {
    console.error('查询执行错误:', error);
    throw error;
  }
}

// 执行返回单一结果的查询
export async function executeQuerySingle(query: string) {
  console.log('执行单一结果查询:', query); // 查询日志
  try {
    const resultSet = await clickhouse.query({
      query,
      format: 'JSONEachRow',
    });
    
    const rows = await resultSet.json();
    return rows.length > 0 ? rows[0] : null;
  } catch (error) {
    console.error('单一结果查询执行错误:', error);
    throw error;
  }
}

export default clickhouse;