// 배치 실행 로그 서비스
// 작성일: 2024-12-24

import prisma from "../config/database";
import {
  BatchExecutionLog,
  CreateBatchExecutionLogRequest,
  UpdateBatchExecutionLogRequest,
  BatchExecutionLogFilter,
  BatchExecutionLogWithConfig
} from "../types/batchExecutionLogTypes";
import { ApiResponse } from "../types/batchTypes";

export class BatchExecutionLogService {
  /**
   * 배치 실행 로그 목록 조회
   */
  static async getExecutionLogs(
    filter: BatchExecutionLogFilter = {}
  ): Promise<ApiResponse<BatchExecutionLogWithConfig[]>> {
    try {
      const {
        batch_config_id,
        execution_status,
        start_date,
        end_date,
        page = 1,
        limit = 50
      } = filter;

      const skip = (page - 1) * limit;
      const take = limit;

      // WHERE 조건 구성
      const where: any = {};
      
      if (batch_config_id) {
        where.batch_config_id = batch_config_id;
      }
      
      if (execution_status) {
        where.execution_status = execution_status;
      }
      
      if (start_date || end_date) {
        where.start_time = {};
        if (start_date) {
          where.start_time.gte = start_date;
        }
        if (end_date) {
          where.start_time.lte = end_date;
        }
      }

      // 로그 조회
      const [logs, total] = await Promise.all([
        prisma.batch_execution_logs.findMany({
          where,
          include: {
            batch_config: {
              select: {
                id: true,
                batch_name: true,
                description: true,
                cron_schedule: true,
                is_active: true
              }
            }
          },
          orderBy: { start_time: 'desc' },
          skip,
          take
        }),
        prisma.batch_execution_logs.count({ where })
      ]);

      return {
        success: true,
        data: logs as BatchExecutionLogWithConfig[],
        pagination: {
          page,
          limit,
          total,
          totalPages: Math.ceil(total / limit)
        }
      };
    } catch (error) {
      console.error("배치 실행 로그 조회 실패:", error);
      return {
        success: false,
        message: "배치 실행 로그 조회 중 오류가 발생했습니다.",
        error: error instanceof Error ? error.message : "알 수 없는 오류"
      };
    }
  }

  /**
   * 배치 실행 로그 생성
   */
  static async createExecutionLog(
    data: CreateBatchExecutionLogRequest
  ): Promise<ApiResponse<BatchExecutionLog>> {
    try {
      const log = await prisma.batch_execution_logs.create({
        data: {
          batch_config_id: data.batch_config_id,
          execution_status: data.execution_status,
          start_time: data.start_time || new Date(),
          end_time: data.end_time,
          duration_ms: data.duration_ms,
          total_records: data.total_records || 0,
          success_records: data.success_records || 0,
          failed_records: data.failed_records || 0,
          error_message: data.error_message,
          error_details: data.error_details,
          server_name: data.server_name || process.env.HOSTNAME || 'unknown',
          process_id: data.process_id || process.pid?.toString()
        }
      });

      return {
        success: true,
        data: log as BatchExecutionLog,
        message: "배치 실행 로그가 생성되었습니다."
      };
    } catch (error) {
      console.error("배치 실행 로그 생성 실패:", error);
      return {
        success: false,
        message: "배치 실행 로그 생성 중 오류가 발생했습니다.",
        error: error instanceof Error ? error.message : "알 수 없는 오류"
      };
    }
  }

  /**
   * 배치 실행 로그 업데이트
   */
  static async updateExecutionLog(
    id: number,
    data: UpdateBatchExecutionLogRequest
  ): Promise<ApiResponse<BatchExecutionLog>> {
    try {
      const log = await prisma.batch_execution_logs.update({
        where: { id },
        data: {
          execution_status: data.execution_status,
          end_time: data.end_time,
          duration_ms: data.duration_ms,
          total_records: data.total_records,
          success_records: data.success_records,
          failed_records: data.failed_records,
          error_message: data.error_message,
          error_details: data.error_details
        }
      });

      return {
        success: true,
        data: log as BatchExecutionLog,
        message: "배치 실행 로그가 업데이트되었습니다."
      };
    } catch (error) {
      console.error("배치 실행 로그 업데이트 실패:", error);
      return {
        success: false,
        message: "배치 실행 로그 업데이트 중 오류가 발생했습니다.",
        error: error instanceof Error ? error.message : "알 수 없는 오류"
      };
    }
  }

  /**
   * 배치 실행 로그 삭제
   */
  static async deleteExecutionLog(id: number): Promise<ApiResponse<void>> {
    try {
      await prisma.batch_execution_logs.delete({
        where: { id }
      });

      return {
        success: true,
        message: "배치 실행 로그가 삭제되었습니다."
      };
    } catch (error) {
      console.error("배치 실행 로그 삭제 실패:", error);
      return {
        success: false,
        message: "배치 실행 로그 삭제 중 오류가 발생했습니다.",
        error: error instanceof Error ? error.message : "알 수 없는 오류"
      };
    }
  }

  /**
   * 특정 배치의 최신 실행 로그 조회
   */
  static async getLatestExecutionLog(
    batchConfigId: number
  ): Promise<ApiResponse<BatchExecutionLog | null>> {
    try {
      const log = await prisma.batch_execution_logs.findFirst({
        where: { batch_config_id: batchConfigId },
        orderBy: { start_time: 'desc' }
      });

      return {
        success: true,
        data: log as BatchExecutionLog | null
      };
    } catch (error) {
      console.error("최신 배치 실행 로그 조회 실패:", error);
      return {
        success: false,
        message: "최신 배치 실행 로그 조회 중 오류가 발생했습니다.",
        error: error instanceof Error ? error.message : "알 수 없는 오류"
      };
    }
  }

  /**
   * 배치 실행 통계 조회
   */
  static async getExecutionStats(
    batchConfigId?: number,
    startDate?: Date,
    endDate?: Date
  ): Promise<ApiResponse<{
    total_executions: number;
    success_count: number;
    failed_count: number;
    success_rate: number;
    average_duration_ms: number;
    total_records_processed: number;
  }>> {
    try {
      const where: any = {};
      
      if (batchConfigId) {
        where.batch_config_id = batchConfigId;
      }
      
      if (startDate || endDate) {
        where.start_time = {};
        if (startDate) {
          where.start_time.gte = startDate;
        }
        if (endDate) {
          where.start_time.lte = endDate;
        }
      }

      const logs = await prisma.batch_execution_logs.findMany({
        where,
        select: {
          execution_status: true,
          duration_ms: true,
          total_records: true
        }
      });

      const total_executions = logs.length;
      const success_count = logs.filter((log: any) => log.execution_status === 'SUCCESS').length;
      const failed_count = logs.filter((log: any) => log.execution_status === 'FAILED').length;
      const success_rate = total_executions > 0 ? (success_count / total_executions) * 100 : 0;
      
      const validDurations = logs
        .filter((log: any) => log.duration_ms !== null)
        .map((log: any) => log.duration_ms!);
      const average_duration_ms = validDurations.length > 0 
        ? validDurations.reduce((sum: number, duration: number) => sum + duration, 0) / validDurations.length 
        : 0;
      
      const total_records_processed = logs
        .filter((log: any) => log.total_records !== null)
        .reduce((sum: number, log: any) => sum + (log.total_records || 0), 0);

      return {
        success: true,
        data: {
          total_executions,
          success_count,
          failed_count,
          success_rate,
          average_duration_ms,
          total_records_processed
        }
      };
    } catch (error) {
      console.error("배치 실행 통계 조회 실패:", error);
      return {
        success: false,
        message: "배치 실행 통계 조회 중 오류가 발생했습니다.",
        error: error instanceof Error ? error.message : "알 수 없는 오류"
      };
    }
  }
}