package com.designhub.service;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.designhub.entity.*;
import com.designhub.mapper.*;
import com.designhub.util.ExcelExportUtil;
import jakarta.servlet.http.HttpServletResponse;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.List;
import java.util.stream.Collectors;

/**
 * 数据导出Service
 */
@Service
@RequiredArgsConstructor
public class ExportService {

    private final TaskMapper taskMapper;
    private final UserMapper userMapper;
    private final DepartmentMapper departmentMapper;
    private final DesignerService designerService;

    private static final DateTimeFormatter DATE_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

    /**
     * 导出任务列表
     */
    public void exportTasks(HttpServletResponse response, String status, Long publisherId) throws IOException {
        // 查询任务数据
        LambdaQueryWrapper<Task> queryWrapper = new LambdaQueryWrapper<>();
        if (status != null && !status.isEmpty()) {
            queryWrapper.eq(Task::getStatus, status);
        }
        if (publisherId != null) {
            queryWrapper.eq(Task::getPublisherId, publisherId);
        }
        queryWrapper.orderByDesc(Task::getCreateTime);

        List<Task> tasks = taskMapper.selectList(queryWrapper);

        // 定义表头
        String[] headers = {
            "任务ID", "任务标题", "发布人", "接收人", "任务类型", "任务状态",
            "预估积分", "任务时效(h)", "开始时间", "截止时间", "创建时间"
        };

        // 定义字段名
        String[] fieldNames = {
            "id", "title", "publisherId", "receiverId", "demandTypeId", "status",
            "scoreReward", "estimatedDuration", "actualStartTime", "deadline", "createTime"
        };

        // 生成文件名
        String fileName = "任务列表_" + LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMMddHHmmss"));

        // 导出Excel
        ExcelExportUtil.exportExcel(response, fileName, "任务列表", headers, fieldNames, tasks);
    }

    /**
     * 导出用户列表
     */
    public void exportUsers(HttpServletResponse response, Long deptId, Integer status) throws IOException {
        // 查询用户数据
        LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>();
        if (deptId != null) {
            queryWrapper.eq(User::getDeptId, deptId);
        }
        if (status != null) {
            queryWrapper.eq(User::getStatus, status);
        }
        queryWrapper.orderByDesc(User::getCreateTime);

        List<User> users = userMapper.selectList(queryWrapper);

        // 定义表头
        String[] headers = {
            "用户ID", "用户名", "真实姓名", "手机号", "邮箱", "部门ID", 
            "状态", "创建时间"
        };

        // 定义字段名
        String[] fieldNames = {
            "id", "username", "realName", "phone", "email", "deptId",
            "status", "createTime"
        };

        // 生成文件名
        String fileName = "用户列表_" + LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMMddHHmmss"));

        // 导出Excel
        ExcelExportUtil.exportExcel(response, fileName, "用户列表", headers, fieldNames, users);
    }

    /**
     * 导出部门列表
     */
    public void exportDepartments(HttpServletResponse response) throws IOException {
        // 查询部门数据
        List<Department> departments = departmentMapper.selectList(
            new LambdaQueryWrapper<Department>()
                .orderByAsc(Department::getSortOrder)
        );

        // 定义表头
        String[] headers = {
            "部门ID", "部门名称", "部门编码", "部门类型", "父部门ID",
            "描述", "排序", "状态", "创建时间"
        };

        // 定义字段名
        String[] fieldNames = {
            "id", "deptName", "deptCode", "deptType", "parentId",
            "description", "sortOrder", "status", "createTime"
        };

        // 生成文件名
        String fileName = "部门列表_" + LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMMddHHmmss"));

        // 导出Excel
        ExcelExportUtil.exportExcel(response, fileName, "部门列表", headers, fieldNames, departments);
    }

    /**
     * 导出设计师统计数据
     */
    public void exportDesignerStats(HttpServletResponse response) throws IOException {
        // 获取设计师统计数据
        var stats = designerService.getAllDesignerStats();

        // 定义表头
        String[] headers = {
            "设计师ID", "设计师姓名", "当前任务数", "排队任务数", "已完成任务数",
            "累计积分", "延误数量", "好评数", "好评率(%)"
        };

        // 定义字段名
        String[] fieldNames = {
            "designerId", "designerName", "currentTasks", "queueTasks", "completedTasks",
            "totalScore", "delayCount", "goodReviews", "goodReviewRate"
        };

        // 生成文件名
        String fileName = "设计师统计_" + LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMMddHHmmss"));

        // 导出Excel
        ExcelExportUtil.exportExcel(response, fileName, "设计师统计", headers, fieldNames, stats);
    }
}