import { Response } from "express";
import { AuthenticatedRequest } from "../types/auth";
import { getPool } from "../database/db";
import { logger } from "../utils/logger";

/**
 * 엔티티 검색 API
 * GET /api/entity-search/:tableName
 */
export async function searchEntity(req: AuthenticatedRequest, res: Response) {
  try {
    const { tableName } = req.params;
    const {
      searchText = "",
      searchFields = "",
      filterCondition = "{}",
      page = "1",
      limit = "20",
    } = req.query;

    // tableName 유효성 검증
    if (!tableName || tableName === "undefined" || tableName === "null") {
      logger.warn("엔티티 검색 실패: 테이블명이 없음", { tableName });
      return res.status(400).json({
        success: false,
        message:
          "테이블명이 지정되지 않았습니다. 컴포넌트 설정에서 sourceTable을 확인해주세요.",
      });
    }

    // 멀티테넌시
    const companyCode = req.user!.companyCode;

    // 검색 필드 파싱
    const fields = searchFields
      ? (searchFields as string).split(",").map((f) => f.trim())
      : [];

    // WHERE 조건 생성
    const whereConditions: string[] = [];
    const params: any[] = [];
    let paramIndex = 1;

    // 멀티테넌시 필터링
    if (companyCode !== "*") {
      whereConditions.push(`company_code = $${paramIndex}`);
      params.push(companyCode);
      paramIndex++;
    }

    // 검색 조건
    if (searchText && fields.length > 0) {
      const searchConditions = fields.map((field) => {
        const condition = `${field}::text ILIKE $${paramIndex}`;
        paramIndex++;
        return condition;
      });
      whereConditions.push(`(${searchConditions.join(" OR ")})`);

      // 검색어 파라미터 추가
      fields.forEach(() => {
        params.push(`%${searchText}%`);
      });
    }

    // 추가 필터 조건
    const additionalFilter = JSON.parse(filterCondition as string);
    for (const [key, value] of Object.entries(additionalFilter)) {
      whereConditions.push(`${key} = $${paramIndex}`);
      params.push(value);
      paramIndex++;
    }

    // 페이징
    const offset = (parseInt(page as string) - 1) * parseInt(limit as string);
    const whereClause =
      whereConditions.length > 0
        ? `WHERE ${whereConditions.join(" AND ")}`
        : "";

    // 쿼리 실행
    const pool = getPool();
    const countQuery = `SELECT COUNT(*) FROM ${tableName} ${whereClause}`;
    const dataQuery = `
      SELECT * FROM ${tableName} ${whereClause} 
      ORDER BY id DESC 
      LIMIT $${paramIndex} OFFSET $${paramIndex + 1}
    `;

    params.push(parseInt(limit as string));
    params.push(offset);

    const countResult = await pool.query(
      countQuery,
      params.slice(0, params.length - 2)
    );
    const dataResult = await pool.query(dataQuery, params);

    logger.info("엔티티 검색 성공", {
      tableName,
      searchText,
      companyCode,
      rowCount: dataResult.rowCount,
    });

    res.json({
      success: true,
      data: dataResult.rows,
      pagination: {
        total: parseInt(countResult.rows[0].count),
        page: parseInt(page as string),
        limit: parseInt(limit as string),
      },
    });
  } catch (error: any) {
    logger.error("엔티티 검색 오류", {
      error: error.message,
      stack: error.stack,
    });
    res.status(500).json({ success: false, message: error.message });
  }
}