package com.oying.modules.pc.product.service.impl;

import com.oying.modules.pc.product.domain.Product;
import com.oying.modules.pc.product.mapper.ProductStockMapper;
import com.oying.modules.pc.product.service.ProductInventoryService;
import com.oying.modules.pc.product.service.ProductService;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service
@RequiredArgsConstructor
public class ProductInventoryServiceImpl implements ProductInventoryService {

    private final ProductStockMapper productStockMapper;
    private final ProductService productService;

    @Override
    public Product getProductById(Long productId) {
        return productService.getProduct(productId);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Product setStockQuantity(Long productId, Integer quantity, Long version) {
        Product existingProduct = this.getProductById(productId);
        productStockMapper.updateStock(productId, quantity, existingProduct.getVersion());
        return this.getProductById(productId);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Product increaseStock(Long productId, Integer amount) {
        Product existingProduct = this.getProductById(productId);
        productStockMapper.increaseStock(productId, amount, existingProduct.getVersion());
        return getProductById(productId);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Product decreaseStock(Long productId, Integer amount) {
        Product existingProduct = this.getProductById(productId);
        if (existingProduct.getStockQuantity() < amount) {
            throw new RuntimeException("库存不足，当前库存: " + existingProduct.getStockQuantity() + ", 请求数量: " + amount);
        }
        productStockMapper.decreaseStock(productId, amount, existingProduct.getVersion());
        return getProductById(productId);
    }

    @Override
    public boolean isStockSufficient(Long productId, Integer requiredAmount) {
        if (requiredAmount == null || requiredAmount <= 0) {
            throw new IllegalArgumentException("需求数量必须大于0");
        }
        Product existingProduct = this.getProductById(productId);
        return existingProduct.getStockQuantity() >= requiredAmount;
    }

}