Backend-POS/Controller/Items.js

const asyncHandler = require("../Middleware/async");
const sequelize = require('sequelize')
const DBInfo = require("../Model/Database");
const ItemModel = require("../Model/ItemModel");
const CategoryModel = require("../Model/CategoryModel");
const ErrorResponse = require("../utils/ErrorResponse");
const SuccessResponse = require("../utils/SuccessResponse");
const fs = require('fs')
const dateFormat = require("dateformat");
const path = require('path');
const { log } = require("console");


exports.getAllItemsByStore = asyncHandler(async (req, res, next) => {
    try {
        let items = await ItemModel.findAll({
            where: {
                DB_CODE: req.user.DB_CODE
            }
        });

        console.log("DB CODE ", req.user.DB_CODE);



        const folderPath = path.join(process.env.ITEM_IMAGE_LOCATION, req.user.DB_CODE);

        // Use Promise.all to wait for all promises to resolve
        items = await Promise.all(items.map(async (item) => {
            let itemObject = item.get({ plain: true });

            try {
                // Get category name
                var category = await CategoryModel.findOne({
                    where: {
                        ID: item.CAT_CODE,
                        DB_CODE: req.user.DB_CODE
                    }
                });
                if (category) {
                    itemObject.CAT_DESC_EN = category.DESC_EN;
                    itemObject.CAT_DESC_KH = category.DESC_KH;
                    itemObject.CAT_DESC_CN = category.DESC_CN;
                }
            } catch (catErr) {
                console.error("Error fetching category", catErr);
                // Optionally handle specific category fetch error
            }

            // Check existence of the image file
            const imagePath = path.join(folderPath, `${item.ITEM_CODE}.jpg`);
            itemObject.ITEM_IMG = fs.existsSync(imagePath) ? imagePath : "";

            return itemObject;
        }));

        res.status(200).send({
            success: true,
            data: items
        });
    } catch (err) {
        console.error("ERROR GET ALL ITEMS", err);
        return next(new ErrorResponse(err.message, 400));
    }
});

exports.createItemByStore = asyncHandler(async (req, res, next) => {
    try {

        var date = dateFormat(new Date(), "yyyy-mm-dd HH:mm:ss")

        const data = JSON.parse(req.body['data']);
        const items = data['items'];
        var photo = req.file.path
        let imageData = fs.readFileSync(req.file.path)
        const itemCode = items['ITEM_CODE'];
        const itemBarCode = items['ITEM_BCODE']
        const itemDes = items['ITEM_DESC'];
        const unitStock = items['UNIT_STOCK'] ?? '1';
        const unitSale = items['UNIT_SALE'] ?? '1';
        const catCode = items['CATE_CODE']; // CAT_CODE -> CAT_DETAIL_ID

        const itemCost1 = items['ITEM_COST1'];
        const itemPrice1 = items['ITEM_PRICE1'];

        if (!itemBarCode || !itemDes || !catCode || !itemCost1 || !itemPrice1) {
            throw ("Please provide all required fields");
        }
        // var itemCode = await generateNextItemCode();


        const existingItem = await ItemModel.findOne({
            where: {
                ITEM_CODE: itemCode,
                DB_CODE: req.user.DB_CODE
            }
        });

        if (existingItem) {
            throw (`ITEM_CODE ${itemCode} already exists`);
        }


        await ItemModel.sequelize.transaction(async (t) => {
            const item = await ItemModel.create({
                ITEM_CODE: itemCode,
                ITEM_BCODE: itemBarCode,
                ITEM_DESC: itemDes,
                DB_CODE: req.user.DB_CODE,
                UNIT_STOCK: unitStock,
                UNIT_SALE: unitSale,
                CAT_CODE: catCode,
                ITEM_STAT: "A",
                USER_CREA: req.user.USER_NAME,
                DATE_CREA: date.toString(),
                ITEM_TYPE: "S", // S -> Kit Stock  N -> Min Kit Stock   I-> ដំណើរការទំនិញ
                ITEM_PRICE1: itemPrice1,
                ITEM_COST1: itemCost1,
                ITEM_COST2: 0,
                ITEM_PRICE2: 0,
                ITEM_CUS1: "",
                ITEM_CUS2: "",
                ITEM_CUS3: "",
                ITEM_CUS4: "",
                ITEM_CUS5: "",
                ITEM_CUS6: "",
                ITEM_CUS7: "",
                ITEM_CUS8: "",
                ITEM_CUS9_KH: "",
                ITEM_CUS10_KH: "",
                USER_UPDT: req.user.USER_NAME,
                DATE_UPDT: date,
            })
            let folderPath = process.env.ITEM_IMAGE_LOCATION + "/" + req.user.DB_CODE + "/"
            if (!fs.existsSync(folderPath)) fs.mkdirSync(folderPath, {
                recursive: true,
            })
            log("ITEM CODE ", item.ITEM_CODE)
            fs.writeFileSync(folderPath + item.ITEM_CODE + '.jpg', imageData)
            fs.unlinkSync(req.file.path)
            res.send(new SuccessResponse("Operation Successful"));

        })



    } catch (err) {
        console.log("ERROR CREATE ITEM", err)
        fs.unlinkSync(req.file.path)
        return next(new ErrorResponse(err, 400));
    }
})


exports.checkIfItemExist = asyncHandler(async (req, res, next) => {
    try {
        const item = await ItemModel.findOne({
            where: {
                ITEM_CODE: req.params.item_code,
                DB_CODE: req.user.DB_CODE
            }
        })
        if (!item) {
            return next(new ErrorResponse("Item not found", 400));
        }
        res.status(200).send({
            success: true,
            data: item
        })
    } catch (err) {
        console.log("ERROR CHECK ITEM", err)
        return next(new ErrorResponse(err, 400));
    }
}
)


async function generateNextItemCode() {
    try {


        const lastItem = await ItemModel.findOne({
            order: [['ITEM_CODE', 'DESC']]
        });
        console.log("LAST ITEM ", lastItem)
        if (!lastItem) {
            return '0001';  // Starting point if no suppliers are present
        }
        console.log("LAST ITEM CODE ", lastItem.ITEM_CODE)
        let nextCode = parseInt(lastItem.ITEM_CODE, 10) + 1;
        console.log("NEXT CODE ", nextCode)

        // Check if the number is less than 10000 for zero-padding
        if (nextCode < 10000) {
            return nextCode.toString().padStart(4, '0');
        } else {
            // If it's 10000 or more, just return the number
            return nextCode.toString();
        }
    }
    catch (e) {
        console.log("CATCH ERROR IN GENERATE ITEM CODE ", e)
    }
}