package com.ruoyi.business.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.ruoyi.business.dto.EquipmentUsageRecordDto;
import com.ruoyi.business.entity.EquipmentManagement;
import com.ruoyi.business.entity.EquipmentUsageDetail;
import com.ruoyi.business.entity.EquipmentUsageRecord;
import com.ruoyi.business.mapper.EquipmentManagementMapper;
import com.ruoyi.business.mapper.EquipmentUsageDetailMapper;
import com.ruoyi.business.mapper.EquipmentUsageRecordMapper;
import com.ruoyi.business.service.EquipmentUsageRecordService;
import com.ruoyi.common.core.domain.entity.SysUser;
import com.ruoyi.common.utils.bean.BeanUtils;
import com.ruoyi.system.mapper.SysUserMapper;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDate;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.function.Function;
import java.util.stream.Collectors;

/**
 * <p>
 * 设备使用记录表 服务实现类
 * </p>
 *
 * @author ld
 * @since 2025-07-07
 */
@Service
@RequiredArgsConstructor
public class EquipmentUsageRecordServiceImpl extends ServiceImpl<EquipmentUsageRecordMapper, EquipmentUsageRecord> implements EquipmentUsageRecordService {

    private final EquipmentUsageRecordMapper equipmentUsageRecordMapper;

    private final EquipmentManagementMapper equipmentManagementMapper;

    private final EquipmentUsageDetailMapper equipmentUsageDetailMapper;

    private final SysUserMapper sysUserMapper;

    @Override
    public IPage<EquipmentUsageRecordDto> selectUsageRecordList(Page<EquipmentUsageRecord> page, EquipmentUsageRecordDto equipmentUsageRecordDto) {
        Page<EquipmentUsageRecord> entityPage = equipmentUsageRecordMapper.selectPage(page, null);
        IPage<EquipmentUsageRecordDto> dtoPage = new Page<>();
        BeanUtils.copyProperties(entityPage, dtoPage);

        List<Long> eqIds = entityPage.getRecords().stream().map(EquipmentUsageRecord::getEquipmentId).toList();
        List<Long> userIds = entityPage.getRecords().stream().map(EquipmentUsageRecord::getUserId).toList();
        //批量查询设备
        Map<Long, EquipmentManagement> equipmentManagementMap;
        if (!eqIds.isEmpty()) {
            List<EquipmentManagement> infos = equipmentManagementMapper.selectList(new LambdaQueryWrapper<EquipmentManagement>().in(EquipmentManagement::getId, eqIds));
            equipmentManagementMap = infos.stream().collect(Collectors.toMap(EquipmentManagement::getId, Function.identity()));
        } else {
            equipmentManagementMap = new HashMap<>();
        }
        //人员查询
        Map<Long, SysUser> userMap;
        if (!userIds.isEmpty()) {
            List<SysUser> sysUsers = sysUserMapper.selectList(userIds);
            userMap = sysUsers.stream().collect(Collectors.toMap(SysUser::getUserId, Function.identity()));
        } else {
            userMap = new HashMap<>();
        }
        //匹配数据
        List<EquipmentUsageRecordDto> dtoRecords = entityPage.getRecords().stream().map(entity -> {
            EquipmentUsageRecordDto dto = new EquipmentUsageRecordDto();
            BeanUtils.copyProperties(entity, dto);
            EquipmentManagement equipment = equipmentManagementMap.get(entity.getEquipmentId());
            if (equipment != null) {
                dto.setEquipmentNo(equipment.getEquipmentNo());
                dto.setEquipmentName(equipment.getEquipmentName());
            }
            SysUser sysUser = userMap.get(entity.getUserId());
            if (sysUser != null) {
                dto.setUserName(sysUser.getNickName());
            }
            int totalReturnNo = equipmentUsageDetailMapper.selectList(
                            new LambdaQueryWrapper<EquipmentUsageDetail>()
                                    .eq(EquipmentUsageDetail::getUsageId, entity.getId())
                                    .eq(EquipmentUsageDetail::getOperationType,2))
                    .stream()
                    .mapToInt(EquipmentUsageDetail::getQuantity)
                    .sum();

            dto.setTotalReturnNo(totalReturnNo);
            return dto;
        }).toList();
        dtoPage.setRecords(dtoRecords);
        return dtoPage;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public int addOrEditUsageRecord(EquipmentUsageRecordDto equipmentUsageRecordDto) {
        // 参数校验
        if (equipmentUsageRecordDto == null) {
            throw new IllegalArgumentException("设备使用记录参数不能为空");
        }

        // 获取设备ID和操作数量
        Long equipmentId = equipmentUsageRecordDto.getEquipmentId();
        Long userId = equipmentUsageRecordDto.getUserId();
        String username = sysUserMapper.selectUserById(userId).getNickName();

        // 查询设备信息
        EquipmentManagement equipment = equipmentManagementMapper.selectById(equipmentId);
        if (equipment == null) {
            throw new RuntimeException("设备不存在");
        }

        int result;
        // 新增记录逻辑
        if (Objects.isNull(equipmentUsageRecordDto.getId())) {
            result = handleNewUsage(equipmentUsageRecordDto, equipment, userId, username);
        } else {
            // 编辑记录逻辑
            EquipmentUsageRecord originalRecord = equipmentUsageRecordMapper.selectById(equipmentUsageRecordDto.getId());
            if (originalRecord == null) {
                throw new RuntimeException("领用记录不存在");
            }

            // 处理归还逻辑
            if (equipmentUsageRecordDto.getEquipmentStatus() != 1) {
                result = handleReturnOperation(equipmentUsageRecordDto, equipment, originalRecord, userId, username);
            } else {
                // 处理普通编辑逻辑（非归还状态）
                result = handleEditOperation(equipmentUsageRecordDto, equipment, originalRecord, userId, username);
            }
        }
        return result;
    }

    private int handleNewUsage(EquipmentUsageRecordDto dto, EquipmentManagement equipment, Long userId, String username) {
        // 检查库存
        if (equipment.getQuantity() < dto.getUsageQuantity()) {
            throw new RuntimeException("库存不足，当前库存：" + equipment.getQuantity());
        }

        // 创建主记录
        EquipmentUsageRecord record = new EquipmentUsageRecord();
        BeanUtils.copyProperties(dto, record);
        record.setUsageStartTime(LocalDate.now());
        record.setEquipmentStatus(1); // 使用中状态
        record.setReturnQuantity(0);

        // 扣减库存
        equipment.setQuantity(equipment.getQuantity() - dto.getUsageQuantity());
        equipmentManagementMapper.updateById(equipment);

        // 保存主记录
        int result = equipmentUsageRecordMapper.insert(record);

        // 保存领用明细记录
        if (result > 0) {
            saveUsageDetail(record.getId(), record.getEquipmentId(), 1, dto.getUsageQuantity(), userId, username, "设备领用");
        }

        return result;
    }

    private int handleReturnOperation(EquipmentUsageRecordDto dto, EquipmentManagement equipment,
                                      EquipmentUsageRecord originalRecord, Long userId, String username) {
        // 校验归还数量
        Integer returnQuantity = dto.getReturnQuantity();
        if (returnQuantity == null || returnQuantity <= 0) {
            throw new RuntimeException("归还数量必须大于0");
        }

        // 计算剩余未归还数量
        int remainingQuantity = originalRecord.getUsageQuantity() - originalRecord.getReturnQuantity();
        if (returnQuantity > remainingQuantity) {
            throw new RuntimeException("归还数量不能超过未归还数量，剩余未归还数量：" + remainingQuantity);
        }

        // 准备更新记录
        EquipmentUsageRecord updateRecord = new EquipmentUsageRecord();
        updateRecord.setId(originalRecord.getId());
        int newReturnQuantity = originalRecord.getReturnQuantity() + returnQuantity;
        updateRecord.setReturnQuantity(newReturnQuantity);

        // 判断是否全部归还
        boolean isFullReturn = newReturnQuantity == originalRecord.getUsageQuantity();
        int newStatus = isFullReturn ? 3 : 2; // 3表示全部归还，2表示部分归还
        updateRecord.setEquipmentStatus(newStatus);
        updateRecord.setUsageEndTime(LocalDate.now());

        // 恢复库存数量
        equipment.setQuantity(equipment.getQuantity() + returnQuantity);
        equipmentManagementMapper.updateById(equipment);

        // 更新主记录
        int result = equipmentUsageRecordMapper.updateById(updateRecord);

        // 保存归还明细记录
        if (result > 0) {
            String remark = isFullReturn ? "设备归还（全部归还）" : "设备归还（部分归还）";
            int operationType = isFullReturn ? 3 : 2; // 与主记录状态保持一致
            saveUsageDetail(originalRecord.getId(), originalRecord.getEquipmentId(),
                    operationType, returnQuantity, userId, username, remark);
        }
        return result;
    }

    private int handleEditOperation(EquipmentUsageRecordDto dto, EquipmentManagement equipment,
                                    EquipmentUsageRecord originalRecord, Long userId, String username) {
        // 检查领用数量是否有变化
        if (!dto.getUsageQuantity().equals(originalRecord.getUsageQuantity())) {
            // 计算库存变化量（旧数量 - 新数量）
            int quantityDelta = originalRecord.getUsageQuantity() - dto.getUsageQuantity();

            // 检查调整后库存是否充足
            int newInventory = equipment.getQuantity() + quantityDelta;
            if (newInventory < 0) {
                throw new RuntimeException("库存不足，调整后库存将为：" + newInventory);
            }

            // 调整库存
            equipment.setQuantity(newInventory);
            if (equipmentManagementMapper.updateById(equipment) == 0) {
                throw new RuntimeException("库存更新失败，可能已被其他操作修改");
            }

            // 记录数量变更明细
            saveUsageDetail(originalRecord.getId(), originalRecord.getEquipmentId(), 3, dto.getUsageQuantity(), userId, username,
                    "领用数量变更：" + originalRecord.getUsageQuantity() + "→" + dto.getUsageQuantity());
        }

        // 更新领用记录
        EquipmentUsageRecord updateRecord = new EquipmentUsageRecord();
        BeanUtils.copyProperties(dto, updateRecord);
        return equipmentUsageRecordMapper.updateById(updateRecord);
    }

    private void saveUsageDetail(Long usageId, Long equipmentId, Integer operationType, Integer quantity,
                                 Long operatorId, String operator, String remark) {
        EquipmentUsageDetail detail = new EquipmentUsageDetail();
        detail.setUsageId(usageId);
        detail.setEquipmentId(equipmentId);
        detail.setOperationType(operationType);
        detail.setQuantity(quantity);
        detail.setOperatorId(operatorId);
        detail.setOperator(operator);
        detail.setRemark(remark);
        equipmentUsageDetailMapper.insert(detail);
    }
}