package com.ruoyi.staff.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.ruoyi.common.enums.StaffLeaveReason;
import com.ruoyi.staff.dto.StaffLeaveDto;
import com.ruoyi.staff.mapper.StaffLeaveMapper;
import com.ruoyi.staff.mapper.StaffOnJobMapper;
import com.ruoyi.staff.pojo.StaffLeave;
import com.ruoyi.staff.service.AnalyticsService;
import com.ruoyi.staff.vo.MonthlyTurnoverRateVo;
import com.ruoyi.staff.vo.TotalTurnoverRateVo;
import lombok.AllArgsConstructor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.List;

@AllArgsConstructor
@Service
public class AnalyticsServiceImpl extends ServiceImpl<StaffLeaveMapper, StaffLeave> implements AnalyticsService {
    @Autowired
    private StaffLeaveMapper staffLeaveMapper;

    @Autowired
    private StaffOnJobMapper staffOnJobMapper;

    @Override
    public List<StaffLeaveDto> staffLeaveReasonAnalytics() {
        List<StaffLeaveDto> result = staffLeaveMapper.staffLeaveReasonAnalytics();
        result.forEach(dto -> {
            String reasonCode = dto.getReason();
            StaffLeaveReason reasonEnum = StaffLeaveReason.getByCode(reasonCode);
            if (reasonEnum != null) {
                dto.setReasonText(reasonEnum.getInfo());
            } else {
                dto.setReasonText("未知原因");
            }
        });
        return result;
    }

    @Override
    public List<MonthlyTurnoverRateVo> getMonthlyTurnoverRateFor12Months() {
        List<MonthlyTurnoverRateVo> result = new ArrayList<>();
        LocalDate now = LocalDate.now();
        DateTimeFormatter monthFormatter = DateTimeFormatter.ofPattern("yyyy-MM");

        // 计算近12个月的数据
        for (int i = 11; i >= 0; i--) {
            LocalDate currentMonth = now.minusMonths(i);
            LocalDate monthStart = currentMonth.withDayOfMonth(1);
            LocalDate monthEnd = currentMonth.withDayOfMonth(currentMonth.lengthOfMonth());

            MonthlyTurnoverRateVo vo = new MonthlyTurnoverRateVo();
            vo.setMonth(currentMonth.format(monthFormatter));
            vo.setMonthStartDate(monthStart);
            vo.setMonthEndDate(monthEnd);

            // 月初员工数（上月末在职员工数）
            LocalDate lastMonthEnd = monthStart.minusDays(1);
            Integer beginMonthStaffCount = staffOnJobMapper.countOnJobStaffByDate(lastMonthEnd);
            vo.setBeginMonthStaffCount(beginMonthStaffCount != null ? beginMonthStaffCount : 0);

            // 月末员工数
            Integer endMonthStaffCount = staffOnJobMapper.countOnJobStaffByDate(monthEnd);
            vo.setEndMonthStaffCount(endMonthStaffCount != null ? endMonthStaffCount : 0);

            // 月度入职员工数
            Integer newHireCount = staffOnJobMapper.countNewHireByMonth(monthStart, monthEnd);
            vo.setNewHireCount(newHireCount != null ? newHireCount : 0);

            // 月度离职员工数
            Integer leaveCount = staffLeaveMapper.countLeaveByMonth(monthStart, monthEnd);
            vo.setLeaveCount(leaveCount != null ? leaveCount : 0);

            // 计算流失率：流失率 = 月度离职员工数 / 月初员工数 * 100%
            Double turnoverRate = 0.0;
            if (vo.getBeginMonthStaffCount() > 0) {
                turnoverRate = (double) vo.getLeaveCount() / vo.getBeginMonthStaffCount() * 100;
                // 保留两位小数
                turnoverRate = Math.round(turnoverRate * 100.0) / 100.0;
            }
            vo.setTurnoverRate(turnoverRate);

            // 计算流动率：流动率 = (月度入职员工数 + 月度离职员工数) / 月初员工数 * 100%
            Double flowRate = 0.0;
            if (vo.getBeginMonthStaffCount() > 0) {
                flowRate = (double) (vo.getNewHireCount() + vo.getLeaveCount()) / vo.getBeginMonthStaffCount() * 100;
                // 保留两位小数
                flowRate = Math.round(flowRate * 100.0) / 100.0;
            }
            vo.setFlowRate(flowRate);

            result.add(vo);
        }

        return result;
    }

    @Override
    public TotalTurnoverRateVo getTotalStatistic() {
        TotalTurnoverRateVo result = new TotalTurnoverRateVo();
        LocalDate now = LocalDate.now();

        // 获取当前在职员工数
        Integer currentOnJobCount = staffOnJobMapper.countOnJobStaffByDate(now);
        result.setCurrentOnJobCount(currentOnJobCount);

        // 获取本月的开始和结束日期
        LocalDate monthStartDate = now.withDayOfMonth(1);
        LocalDate monthEndDate = now.withDayOfMonth(now.lengthOfMonth());

        // 获取月初员工数（即上月末员工数）
        Integer beginMonthStaffCount = staffOnJobMapper.countOnJobStaffByDate(monthStartDate.minusDays(1));

        // 获取本月新入职员工数
        Integer newHireCount = staffOnJobMapper.countNewHireByMonth(monthStartDate, monthEndDate);

        // 获取本月离职员工数
        Integer leaveCount = staffLeaveMapper.countLeaveByMonth(monthStartDate, monthEndDate);

        // 计算总流动率 = (入职人数 + 离职人数) / 月初员工数 * 100%
        Double totalFlowRate = 0.0;
        if (beginMonthStaffCount > 0) {
            totalFlowRate = (double) (newHireCount + leaveCount) / beginMonthStaffCount * 100;
            // 保留两位小数
            totalFlowRate = Math.round(totalFlowRate * 100.0) / 100.0;
        }
        result.setTotalFlowRate(totalFlowRate);

        // 计算总流失率 = 离职人数 / 月初员工数 * 100%
        Double totalTurnoverRate = 0.0;
        if (beginMonthStaffCount > 0) {
            totalTurnoverRate = (double) leaveCount / beginMonthStaffCount * 100;
            // 保留两位小数
            totalTurnoverRate = Math.round(totalTurnoverRate * 100.0) / 100.0;
        }
        result.setTotalTurnoverRate(totalTurnoverRate);

        return result;
    }
}