package cn.iocoder.yudao.module.hrm.service.attendance;

import cn.iocoder.yudao.framework.common.pojo.PageResult;
import cn.iocoder.yudao.framework.common.util.object.BeanUtils;
import cn.iocoder.yudao.framework.mybatis.core.query.LambdaQueryWrapperX;
import cn.iocoder.yudao.module.hrm.controller.admin.attendance.vo.HrmAttendanceRulePageReqVO;
import cn.iocoder.yudao.module.hrm.controller.admin.attendance.vo.HrmAttendanceRuleSaveReqVO;
import cn.iocoder.yudao.module.hrm.dal.dataobject.attendance.HrmAttendanceRuleDO;
import cn.iocoder.yudao.module.hrm.dal.mysql.attendance.HrmAttendanceRuleMapper;
import jakarta.annotation.Resource;
import org.springframework.stereotype.Service;
import org.springframework.validation.annotation.Validated;

import java.math.BigDecimal;
import java.time.LocalDate;
import java.util.List;

import static cn.iocoder.yudao.framework.common.exception.util.ServiceExceptionUtil.exception;
import static cn.iocoder.yudao.module.hrm.enums.ErrorCodeConstants.*;

/**
 * 考勤规则配置 Service 实现类
 *
 * 说明：同一部门允许配置多条规则，按「生效开始日期 / 生效结束日期」区间区分；
 * 匹配时取覆盖目标日期、且生效开始日期最晚的那条（无日期的视为长期有效，优先级最低）。
 *
 * @author 超级管理员
 */
@Service
@Validated
public class HrmAttendanceRuleServiceImpl implements HrmAttendanceRuleService {

    @Resource
    private HrmAttendanceRuleMapper attendanceRuleMapper;

    @Override
    public Long createAttendanceRule(HrmAttendanceRuleSaveReqVO createReqVO) {
        // 校验规则名称是否重复（同一部门允许多条规则，不再限制部门唯一）
        validateAttendanceRuleNameUnique(null, createReqVO.getName());
        validateEffectiveDateRange(createReqVO.getEffectiveStartDate(), createReqVO.getEffectiveEndDate());
        HrmAttendanceRuleDO attendanceRule = BeanUtils.toBean(createReqVO, HrmAttendanceRuleDO.class);
        // 设置默认值
        if (attendanceRule.getLateAllowMinutes() == null) {
            attendanceRule.setLateAllowMinutes(0);
        }
        if (attendanceRule.getEarlyAllowMinutes() == null) {
            attendanceRule.setEarlyAllowMinutes(0);
        }
        if (attendanceRule.getOvertimeThreshold() == null) {
            attendanceRule.setOvertimeThreshold(BigDecimal.ONE);
        }
        if (attendanceRule.getStatus() == null) {
            attendanceRule.setStatus(0);
        }
        attendanceRuleMapper.insert(attendanceRule);
        return attendanceRule.getId();
    }

    @Override
    public void updateAttendanceRule(HrmAttendanceRuleSaveReqVO updateReqVO) {
        validateAttendanceRuleExists(updateReqVO.getId());
        // 校验规则名称是否重复
        validateAttendanceRuleNameUnique(updateReqVO.getId(), updateReqVO.getName());
        validateEffectiveDateRange(updateReqVO.getEffectiveStartDate(), updateReqVO.getEffectiveEndDate());
        HrmAttendanceRuleDO updateObj = BeanUtils.toBean(updateReqVO, HrmAttendanceRuleDO.class);
        attendanceRuleMapper.updateById(updateObj);
    }

    @Override
    public void deleteAttendanceRule(Long id) {
        validateAttendanceRuleExists(id);
        attendanceRuleMapper.deleteById(id);
    }

    private void validateAttendanceRuleExists(Long id) {
        if (attendanceRuleMapper.selectById(id) == null) {
            throw exception(ATTENDANCE_RULE_NOT_EXISTS);
        }
    }

    private void validateAttendanceRuleNameUnique(Long id, String name) {
        HrmAttendanceRuleDO rule = attendanceRuleMapper.selectOne(HrmAttendanceRuleDO::getName, name);
        if (rule == null) {
            return;
        }
        if (id == null) {
            throw exception(ATTENDANCE_RULE_NAME_EXISTS);
        }
        if (!rule.getId().equals(id)) {
            throw exception(ATTENDANCE_RULE_NAME_EXISTS);
        }
    }

    /**
     * 校验生效日期区间：开始日期不能晚于结束日期
     */
    private void validateEffectiveDateRange(LocalDate startDate, LocalDate endDate) {
        if (startDate != null && endDate != null && startDate.isAfter(endDate)) {
            throw exception(ATTENDANCE_RULE_EFFECTIVE_DATE_INVALID);
        }
    }

    @Override
    public HrmAttendanceRuleDO getAttendanceRule(Long id) {
        return attendanceRuleMapper.selectById(id);
    }

    @Override
    public PageResult<HrmAttendanceRuleDO> getAttendanceRulePage(HrmAttendanceRulePageReqVO pageReqVO) {
        return attendanceRuleMapper.selectPage(pageReqVO);
    }

    @Override
    public List<HrmAttendanceRuleDO> getAttendanceRuleList() {
        return attendanceRuleMapper.selectListByStatus(0);
    }

    @Override
    public HrmAttendanceRuleDO getAttendanceRuleByDeptId(Long deptId, LocalDate date) {
        LocalDate targetDate = date != null ? date : LocalDate.now();
        // 1. 先查找部门专属规则（覆盖目标日期的，生效开始日期最晚的优先）
        if (deptId != null) {
            List<HrmAttendanceRuleDO> deptRules = selectEffectiveRules(deptId, targetDate);
            if (!deptRules.isEmpty()) {
                return deptRules.get(0);
            }
        }
        // 2. 查找全局规则（deptId 为 null）
        List<HrmAttendanceRuleDO> globalRules = selectEffectiveRules(null, targetDate);
        if (!globalRules.isEmpty()) {
            return globalRules.get(0);
        }
        return null;
    }

    /**
     * 查询在指定日期生效的规则
     *
     * @param deptId 部门ID，null 表示全局规则
     * @param date   目标日期
     */
    private List<HrmAttendanceRuleDO> selectEffectiveRules(Long deptId, LocalDate date) {
        LambdaQueryWrapperX<HrmAttendanceRuleDO> wrapper = new LambdaQueryWrapperX<>();
        if (deptId == null) {
            wrapper.isNull(HrmAttendanceRuleDO::getDeptId);
        } else {
            wrapper.eq(HrmAttendanceRuleDO::getDeptId, deptId);
        }
        wrapper.eq(HrmAttendanceRuleDO::getStatus, 0);
        // 生效开始日期为空（不限）或 <= 目标日期
        wrapper.and(w -> w.isNull(HrmAttendanceRuleDO::getEffectiveStartDate)
                .or().le(HrmAttendanceRuleDO::getEffectiveStartDate, date));
        // 生效结束日期为空（不限）或 >= 目标日期
        wrapper.and(w -> w.isNull(HrmAttendanceRuleDO::getEffectiveEndDate)
                .or().ge(HrmAttendanceRuleDO::getEffectiveEndDate, date));
        // 生效开始日期越晚优先级越高；同开始日期时取先创建的
        wrapper.orderByDesc(HrmAttendanceRuleDO::getEffectiveStartDate);
        wrapper.orderByAsc(HrmAttendanceRuleDO::getId);
        return attendanceRuleMapper.selectList(wrapper);
    }

}