package com.klp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import com.klp.common.core.page.TableDataInfo;
import com.klp.common.core.domain.PageQuery;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.klp.common.utils.StringUtils;
import com.klp.domain.vo.WmsAttendanceShiftRuleVo;
import com.klp.domain.vo.WmsAttendanceShiftVo;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.klp.domain.bo.WmsAttendanceScheduleBo;
import com.klp.domain.bo.GenerateScheduleBo;
import com.klp.domain.vo.WmsAttendanceScheduleVo;
import com.klp.domain.WmsAttendanceSchedule;
import com.klp.domain.WmsAttendanceShiftRule;
import com.klp.domain.WmsAttendanceShift;
import com.klp.mapper.WmsAttendanceScheduleMapper;
import com.klp.service.IWmsAttendanceScheduleService;
import com.klp.service.IWmsAttendanceShiftRuleService;
import com.klp.service.IWmsAttendanceShiftService;

import java.time.LocalDate;
import java.time.temporal.ChronoUnit;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import java.util.Collection;
import java.util.Map;

/**
 * 排班(谁在哪天上班)Service业务层处理
 *
 * @author klp
 * @date 2026-05-08
 */
@RequiredArgsConstructor
@Service
public class WmsAttendanceScheduleServiceImpl implements IWmsAttendanceScheduleService {

    private final WmsAttendanceScheduleMapper baseMapper;
    private final IWmsAttendanceShiftRuleService shiftRuleService;
    private final IWmsAttendanceShiftService shiftService;

    /**
     * 查询排班(谁在哪天上班)
     */
    @Override
    public WmsAttendanceScheduleVo queryById(Long scheduleId){
        WmsAttendanceSchedule schedule = baseMapper.selectById(scheduleId);
        if (schedule == null) {
            return null;
        }

        // 使用关联查询获取详细信息
        List<WmsAttendanceScheduleVo> list = baseMapper.selectScheduleWithDetails(
            schedule.getUserId(), schedule.getWorkDate(), schedule.getShiftId());

        return list.isEmpty() ? null : list.get(0);
    }

    /**
     * 查询排班(谁在哪天上班)列表
     */
    @Override
    public TableDataInfo<WmsAttendanceScheduleVo> queryPageList(WmsAttendanceScheduleBo bo, PageQuery pageQuery) {
        Page<WmsAttendanceScheduleVo> page = pageQuery.<WmsAttendanceScheduleVo>build();
        List<WmsAttendanceScheduleVo> list = baseMapper.selectScheduleWithDetailsPage(
            bo.getUserId(), bo.getWorkDate(), bo.getShiftId(), bo.getShiftName(), bo.getShiftGroup());

        // 手动分页处理
        int total = list.size();
        int startNum = (int) ((page.getCurrent() - 1) * page.getSize());
        int endNum = Math.min(startNum + (int) page.getSize(), total);

        List<WmsAttendanceScheduleVo> pageList = new ArrayList<>();
        if (startNum < total) {
            pageList = list.subList(startNum, endNum);
        }

        Page<WmsAttendanceScheduleVo> result = new Page<>(page.getCurrent(), page.getSize(), total);
        result.setRecords(pageList);
        return TableDataInfo.build(result);
    }

    /**
     * 查询排班(谁在哪天上班)列表
     */
    @Override
    public List<WmsAttendanceScheduleVo> queryList(WmsAttendanceScheduleBo bo) {
        return baseMapper.selectScheduleWithDetails(bo.getUserId(), bo.getWorkDate(), bo.getShiftId());
    }

    /**
     * 新增排班(谁在哪天上班)
     */
    @Override
    public Boolean insertByBo(WmsAttendanceScheduleBo bo) {
        WmsAttendanceSchedule add = BeanUtil.toBean(bo, WmsAttendanceSchedule.class);
        validEntityBeforeSave(add);
        boolean flag = baseMapper.insert(add) > 0;
        if (flag) {
            bo.setScheduleId(add.getScheduleId());
        }
        return flag;
    }

    /**
     * 修改排班(谁在哪天上班)
     */
    @Override
    public Boolean updateByBo(WmsAttendanceScheduleBo bo) {
        WmsAttendanceSchedule update = BeanUtil.toBean(bo, WmsAttendanceSchedule.class);
        validEntityBeforeSave(update);
        return baseMapper.updateById(update) > 0;
    }

    /**
     * 保存前的数据校验
     */
    private void validEntityBeforeSave(WmsAttendanceSchedule entity){
        //TODO 做一些数据校验,如唯一约束
    }

    /**
     * 批量删除排班(谁在哪天上班)
     */
    @Override
    public Boolean deleteWithValidByIds(Collection<Long> ids, Boolean isValid) {
        if(isValid){
            //TODO 做一些业务上的校验,判断是否需要校验
        }
        return baseMapper.deleteBatchIds(ids) > 0;
    }

    /**
     * 生成排班
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public void generateSchedule(GenerateScheduleBo bo) {
        LocalDate startDate = bo.getStartDate().toInstant().atZone(java.time.ZoneId.systemDefault()).toLocalDate();
        LocalDate endDate = bo.getEndDate().toInstant().atZone(java.time.ZoneId.systemDefault()).toLocalDate();

        if (startDate.isAfter(endDate)) {
            throw new RuntimeException("开始时间不能大于结束时间");
        }

        if (bo.getRuleId() == null) {
            // 正常排班，不倒班
            generateNormalSchedule(bo, startDate, endDate);
        } else {
            // 倒班排班
            generateShiftSchedule(bo, startDate, endDate);
        }
    }

    /**
     * 生成正常排班
     */
    private void generateNormalSchedule(GenerateScheduleBo bo, LocalDate startDate, LocalDate endDate) {
        List<WmsAttendanceSchedule> schedules = new ArrayList<>();

        // 获取班次信息
        WmsAttendanceShiftVo shift = shiftService.queryById(bo.getShiftId());
        if (shift == null) {
            throw new RuntimeException("班次不存在");
        }

        LocalDate currentDate = startDate;
        while (!currentDate.isAfter(endDate)) {
            // 检查是否已存在排班
            if (!isScheduleExists(bo.getUserId(), currentDate)) {
                WmsAttendanceSchedule schedule = new WmsAttendanceSchedule();
                schedule.setUserId(bo.getUserId());
                schedule.setWorkDate(java.sql.Date.valueOf(currentDate));
                schedule.setShiftId(bo.getShiftId());
                schedule.setShiftName(shift.getShiftName());
                schedules.add(schedule);
            }
            currentDate = currentDate.plusDays(1);
        }

        // 批量插入
        if (!schedules.isEmpty()) {
            boolean ok = baseMapper.insertBatch(schedules);
            if (!ok) {
                throw new RuntimeException("排班插入失败");
            }
        }
    }

    /**
     * 生成倒班排班
     */
    private void generateShiftSchedule(GenerateScheduleBo bo, LocalDate startDate, LocalDate endDate) {
        // 获取倒班规则
        WmsAttendanceShiftRuleVo rule = shiftRuleService.queryById(bo.getRuleId());
        if (rule == null) {
            throw new RuntimeException("倒班规则不存在");
        }

        // 验证班次匹配
        if (!bo.getShiftId().equals(rule.getShiftA()) && !bo.getShiftId().equals(rule.getShiftB())) {
            throw new RuntimeException("班次ID与倒班规则不匹配");
        }

        // 获取班次信息
        WmsAttendanceShiftVo shiftA = shiftService.queryById(rule.getShiftA());
        WmsAttendanceShiftVo shiftB = shiftService.queryById(rule.getShiftB());
        WmsAttendanceShiftVo changeShiftB = rule.getChangeShiftBId() != null ?
            shiftService.queryById(rule.getChangeShiftBId()) : null;
        WmsAttendanceShiftVo changeShiftA = rule.getChangeShiftAId() != null ?
            shiftService.queryById(rule.getChangeShiftAId()) : null;

        if (shiftA == null || shiftB == null) {
            throw new RuntimeException("倒班规则中的班次不存在");
        }

        List<WmsAttendanceSchedule> schedules = new ArrayList<>();
        LocalDate currentDate = startDate;
        long daysFromStart = 0;

        // 确定初始班次
        boolean isCurrentShiftA = bo.getShiftId().equals(rule.getShiftA());

        while (!currentDate.isAfter(endDate)) {
            if (!isScheduleExists(bo.getUserId(), currentDate)) {
                WmsAttendanceSchedule schedule = new WmsAttendanceSchedule();
                schedule.setUserId(bo.getUserId());
                schedule.setWorkDate(java.sql.Date.valueOf(currentDate));

                // 判断是否为倒班日
                long cycleDays = rule.getCycleDays() != null ? rule.getCycleDays() : 10;
                boolean isChangeDay = (daysFromStart + 1) % cycleDays == 0;

                if (isChangeDay) {
                    // 倒班日
                    if (isCurrentShiftA) {
                        // 白班转夜班
                        if (changeShiftB != null) {
                            schedule.setShiftId(rule.getChangeShiftBId());
                            schedule.setShiftName(changeShiftB.getShiftName());
                        } else {
                            schedule.setShiftId(rule.getShiftB());
                            schedule.setShiftName(shiftB.getShiftName());
                        }
                        // 下一天也使用倒班班次（工作18小时）
                        LocalDate nextDay = currentDate.plusDays(1);
                        if (!nextDay.isAfter(endDate) && !isScheduleExists(bo.getUserId(), nextDay)) {
                            WmsAttendanceSchedule nextSchedule = new WmsAttendanceSchedule();
                            nextSchedule.setUserId(bo.getUserId());
                            nextSchedule.setWorkDate(java.sql.Date.valueOf(nextDay));
                            if (changeShiftB != null) {
                                nextSchedule.setShiftId(rule.getChangeShiftBId());
                                nextSchedule.setShiftName(changeShiftB.getShiftName());
                            } else {
                                nextSchedule.setShiftId(rule.getShiftB());
                                nextSchedule.setShiftName(shiftB.getShiftName());
                            }
                            schedules.add(nextSchedule);
                        }
                        isCurrentShiftA = false;
                        currentDate = currentDate.plusDays(1); // 跳过下一天，因为已经处理了
                        daysFromStart++;
                    } else {
                        // 夜班转白班
                        if (changeShiftA != null) {
                            schedule.setShiftId(rule.getChangeShiftAId());
                            schedule.setShiftName(changeShiftA.getShiftName());
                        } else {
                            schedule.setShiftId(rule.getShiftA());
                            schedule.setShiftName(shiftA.getShiftName());
                        }
                        isCurrentShiftA = true;
                    }
                } else {
                    // 普通日
                    if (isCurrentShiftA) {
                        schedule.setShiftId(rule.getShiftA());
                        schedule.setShiftName(shiftA.getShiftName());
                    } else {
                        schedule.setShiftId(rule.getShiftB());
                        schedule.setShiftName(shiftB.getShiftName());
                    }
                }

                schedules.add(schedule);
            }
            currentDate = currentDate.plusDays(1);
            daysFromStart++;
        }

        // 批量插入
        if (!schedules.isEmpty()) {
            for (WmsAttendanceSchedule schedule : schedules) {
                baseMapper.insert(schedule);
            }
        }
    }

    /**
     * 检查排班是否已存在
     */
    private boolean isScheduleExists(Long userId, LocalDate workDate) {
        LambdaQueryWrapper<WmsAttendanceSchedule> wrapper = Wrappers.lambdaQuery();
        wrapper.eq(WmsAttendanceSchedule::getUserId, userId)
               .eq(WmsAttendanceSchedule::getWorkDate, java.sql.Date.valueOf(workDate));
        return baseMapper.selectCount(wrapper) > 0;
    }
}