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.core.toolkit.CollectionUtils;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.ruoyi.business.dto.ProductionMasterDto;
import com.ruoyi.business.entity.OfficialInventory;
import com.ruoyi.business.entity.Production;
import com.ruoyi.business.entity.ProductionInventory;
import com.ruoyi.business.entity.ProductionMaster;
import com.ruoyi.business.mapper.OfficialInventoryMapper;
import com.ruoyi.business.mapper.ProductionInventoryMapper;
import com.ruoyi.business.mapper.ProductionMapper;
import com.ruoyi.business.mapper.ProductionMasterMapper;
import com.ruoyi.business.service.ProductionMasterService;
import com.ruoyi.common.core.domain.entity.SysUser;
import com.ruoyi.common.exception.base.BaseException;
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.math.BigDecimal;
import java.util.*;
import java.util.stream.Collectors;

/**
 * <p>
 * 生产主表 服务实现类
 * </p>
 *
 * @author ruoyi
 * @since 2025-06-13
 */
@Service
@RequiredArgsConstructor
public class ProductionMasterServiceImpl extends ServiceImpl<ProductionMasterMapper, ProductionMaster> implements ProductionMasterService {

    private final ProductionMasterMapper productionMasterMapper;

    private final ProductionInventoryMapper productionInventoryMapper;

    private final ProductionMapper productionMapper;

    private final OfficialInventoryMapper officialInventoryMapper;

    private final SysUserMapper sysUserMapper;

    @Override
    public IPage<ProductionMasterDto> selectPMList(Page page, ProductionMasterDto productionMasterDto) {
        // 1. 构建主表查询条件
        LambdaQueryWrapper<ProductionMaster> masterQueryWrapper = new LambdaQueryWrapper<>();

        // 2. 执行主表分页查询
        IPage<ProductionMaster> entityPage = productionMasterMapper.selectPage(page, masterQueryWrapper);

        // 3. 提取主表ID列表用于批量查询子表数据
        List<Long> masterIds = entityPage.getRecords().stream()
                .map(ProductionMaster::getId)
                .collect(Collectors.toList());

        // 4. 批量查询关联数据（避免N+1问题）
        Map<Long, List<Production>> productionMap = queryProductionByMasterIds(masterIds);
        Map<Long, List<ProductionInventory>> inventoryMap = queryInventoryByMasterIds(masterIds);

        // 5. 转换数据并组装结果
        List<ProductionMasterDto> dtoList = entityPage.getRecords().stream()
                .map(record -> {
                    ProductionMasterDto dto = new ProductionMasterDto();
                    BeanUtils.copyProperties(record, dto);
                    dto.setProductionList(productionMap.getOrDefault(record.getId(), Collections.emptyList()));
                    dto.setProductionInventoryList(inventoryMap.getOrDefault(record.getId(), Collections.emptyList()));
                    return dto;
                })
                .collect(Collectors.toList());

        // 6. 构建返回结果
        IPage<ProductionMasterDto> dtoPage = new Page<>();
        BeanUtils.copyProperties(entityPage, dtoPage, "records");
        dtoPage.setRecords(dtoList);

        return dtoPage;
    }

    /**
     * 批量查询Production数据
     */
    private Map<Long, List<Production>> queryProductionByMasterIds(List<Long> masterIds) {
        if (masterIds.isEmpty()) {
            return Collections.emptyMap();
        }

        LambdaQueryWrapper<Production> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(Production::getProductionMasterId, masterIds);
        List<Production> productions = productionMapper.selectList(queryWrapper);

        return productions.stream()
                .collect(Collectors.groupingBy(Production::getProductionMasterId));
    }

    /**
     * 批量查询ProductionInventory数据
     */
    private Map<Long, List<ProductionInventory>> queryInventoryByMasterIds(List<Long> masterIds) {
        if (masterIds.isEmpty()) {
            return Collections.emptyMap();
        }

        LambdaQueryWrapper<ProductionInventory> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(ProductionInventory::getProductionMasterId, masterIds);
        List<ProductionInventory> inventoryList = productionInventoryMapper.selectList(queryWrapper);

        return inventoryList.stream()
                .collect(Collectors.groupingBy(ProductionInventory::getProductionMasterId));
    }

    @Override
    @Transactional
    public int addOrEditPM(ProductionMasterDto productionMasterDto) {
        // 1. 直接计算聚合值，避免创建多余列表
        BigDecimal totalPurchasePrice = BigDecimal.ZERO;
        BigDecimal totalLaborCost = BigDecimal.ZERO;
        BigDecimal totalEnergyConsumptionCost = BigDecimal.ZERO;
        BigDecimal totalTotalCost = BigDecimal.ZERO;
        BigDecimal totalEquipmentDepreciation = BigDecimal.ZERO;
        int totalProductionQuantity = 0;
        StringBuilder coalBuilder = new StringBuilder();

        for (Production production : productionMasterDto.getProductionList()) {
            totalPurchasePrice = totalPurchasePrice.add(production.getPurchasePrice());
            totalLaborCost = totalLaborCost.add(production.getLaborCost());
            totalEnergyConsumptionCost = totalEnergyConsumptionCost.add(production.getEnergyConsumptionCost());
            totalTotalCost = totalTotalCost.add(production.getTotalCost());
            totalEquipmentDepreciation = totalEquipmentDepreciation.add(production.getEquipmentDepreciation());
            totalProductionQuantity += production.getProductionQuantity();
            if (coalBuilder.length() > 0) {
                coalBuilder.append(","); // 在元素之间添加逗号
            }
            coalBuilder.append(production.getCoal());
        }
        String coalStr = coalBuilder.toString(); // 直接获取拼接结果

        // 2. 创建主表对象
        ProductionMaster productionMaster = new ProductionMaster();
        productionMaster.setProductionQuantity(totalProductionQuantity);
        productionMaster.setTotalCost(totalTotalCost);
        productionMaster.setEquipmentDepreciation(totalEquipmentDepreciation);
        productionMaster.setEnergyConsumptionCost(totalEnergyConsumptionCost);
        productionMaster.setLaborCost(totalLaborCost);
        productionMaster.setCoal(coalStr);

        Long masterId = productionMasterDto.getId();
        productionMaster.setId(masterId);

        // 3. 统一子表处理逻辑
        Long producerId = productionMasterDto.getProducerId();
        if (producerId == null) {
            throw new BaseException("请选择生产者");
        }
        SysUser sysUser = sysUserMapper.selectUserById(producerId);
        productionMaster.setProducer(sysUser.getUserName());
        if (masterId == null) {
            productionMasterMapper.insert(productionMaster);
            masterId = productionMaster.getId(); // 获取新生成的ID
        } else {
            // 删除关联子表数据
            productionMapper.delete(new LambdaQueryWrapper<Production>()
                    .eq(Production::getProductionMasterId, masterId));

            productionInventoryMapper.delete(new LambdaQueryWrapper<ProductionInventory>()
                    .eq(ProductionInventory::getProductionMasterId, masterId));

            productionMasterMapper.updateById(productionMaster);
        }
        //库存更新
        for (ProductionInventory productionInventory : productionMasterDto.getProductionInventoryList()) {
            OfficialInventory officialInventory = officialInventoryMapper.selectById(productionInventory.getOfficialId());
            BigDecimal subtract = officialInventory.getInventoryQuantity().subtract(new BigDecimal(productionInventory.getUsedQuantity()));
            if (subtract.compareTo(BigDecimal.ZERO) < 0) {
                throw new BaseException("库存不足");
            }
            officialInventory.setInventoryQuantity(subtract);
            officialInventoryMapper.updateById(officialInventory);
        }
        
        // 4. 批量插入子表数据
        batchInsertProductions(masterId, productionMasterDto.getProductionList());
        batchInsertInventories(masterId, productionMasterDto.getProductionInventoryList());

        return 1;
    }

    // 批量插入生产数据
    private void batchInsertProductions(Long masterId, List<Production> productions) {
        List<Production> insertList = productions.stream()
                .peek(p -> {
                    p.setId(null);
                    p.setProductionMasterId(masterId);
                })
                .collect(Collectors.toList());

        if (!insertList.isEmpty()) {
            for (Production production : productions) {
                production.setId(null);
                production.setProductionMasterId(masterId);
                productionMapper.insert(production);
            }
        }
    }

    // 批量插入库存数据
    private void batchInsertInventories(Long masterId, List<ProductionInventory> inventories) {
        List<ProductionInventory> insertList = inventories.stream()
                .peek(inv -> {
                    inv.setId(null);
                    inv.setProductionMasterId(masterId);
                })
                .collect(Collectors.toList());

        if (!insertList.isEmpty()) {
            for (ProductionInventory inventory : inventories) {
                inventory.setId(null);
                inventory.setProductionMasterId(masterId);
                productionInventoryMapper.insert(inventory);
            }
        }
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public int delByIds(Long[] ids) {
        if (ids == null || ids.length == 0) {
            return 0;
        }

        List<Long> idList = Arrays.asList(ids);

        // 1. 预加载所有关联数据
        List<ProductionInventory> allInventoryList = productionInventoryMapper.selectList(
                new LambdaQueryWrapper<ProductionInventory>()
                        .in(ProductionInventory::getProductionMasterId, idList)
        );

        // 2. 按官方库存ID分组并计算库存调整量
        Map<Long, BigDecimal> inventoryAdjustMap = allInventoryList.stream()
                .collect(Collectors.groupingBy(
                        ProductionInventory::getOfficialId,
                        Collectors.reducing(
                                BigDecimal.ZERO,
                                inv -> new BigDecimal(inv.getUsedQuantity()),
                                BigDecimal::add
                        )
                ));

        // 3. 批量更新官方库存 (使用SQL直接更新)
        if (!inventoryAdjustMap.isEmpty()) {
            inventoryAdjustMap.forEach((officialId, adjustAmount) ->
                    officialInventoryMapper.addInventoryQuantity(officialId, adjustAmount)
            );
        }

        // 4. 批量删除关联数据
        if (!allInventoryList.isEmpty()) {
            List<Long> inventoryIds = allInventoryList.stream()
                    .map(ProductionInventory::getId)
                    .collect(Collectors.toList());
            productionInventoryMapper.deleteBatchIds(inventoryIds);
        }

        // 删除生产明细
        productionMapper.delete(
                new LambdaQueryWrapper<Production>()
                        .in(Production::getProductionMasterId, idList)
        );

        // 5. 删除主记录
        return productionMasterMapper.deleteBatchIds(idList);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public int deleteProductionInventory(ProductionMasterDto productionMasterDto) {
        List<ProductionInventory> inventories = productionMasterDto.getProductionInventoryList();
        if (CollectionUtils.isEmpty(inventories)) {
            return 0;
        }

        // 预收集数据用于批量操作
        Map<Long, BigDecimal> inventoryAdjustMap = new HashMap<>();
        List<Long> productionIdsToDelete = new ArrayList<>(inventories.size());

        for (ProductionInventory inventory : inventories) {
            // 收集需要删除的生产库存ID
            productionIdsToDelete.add(inventory.getId());

            // 累计库存调整量（相同officialId的用量累加）
            BigDecimal adjustment = new BigDecimal(inventory.getUsedQuantity());
            inventoryAdjustMap.merge(
                    inventory.getOfficialId(),
                    adjustment,
                    BigDecimal::add
            );
        }

        // 批量更新官方库存
        for (Map.Entry<Long, BigDecimal> entry : inventoryAdjustMap.entrySet()) {
            OfficialInventory official = officialInventoryMapper.selectById(entry.getKey());
            if (official == null) {
                throw new BaseException("官方库存不存在，ID: " + entry.getKey());
            }

            // 使用线程安全的BigDecimal操作
            official.setInventoryQuantity(
                    Optional.ofNullable(official.getInventoryQuantity())
                            .orElse(BigDecimal.ZERO)
                            .add(entry.getValue())
            );
            officialInventoryMapper.updateById(official);
        }

        // 批量删除生产库存
        if (!productionIdsToDelete.isEmpty()) {
            productionInventoryMapper.deleteBatchIds(productionIdsToDelete);
        }

        return productionIdsToDelete.size();
    }
}