const bodyParser = require('body-parser');
const express = require('express');
const { getErrorMessage } = require('../constants/api_constans');

const success = (res, data, msg, param = null) => {
    var dataJson = data;
    var data = {};
    if (param != null) data[param] = dataJson;
    else data = dataJson;

    return res.status(200).json({
        success: true,
        message: msg,
        data,
    });
};

const failed = (res, errorCode, message = null) => {
    const error = getErrorMessage(errorCode);

    return res.status(error.httpCode).json({
        success: false,
        message: message || error.message,
        error_code: errorCode,
        data: null,
    });
};

const pagination = (page, size) => {
    let limit = null;
    let offset = null;
    
    if(page == null) page = 1;
    if(size == null) size = 10;

    if (page != null) {
        limit = size ? +size : 5;
        offset = limit ? 0 + (page - 1) * limit : null;
    }

    return {
        limit,
        offset,
    };
}

function paginationResponse(model, page, limit, dataKey, resource) {
    const totalItem = model.count;
    const currentPage = parseInt(page);
    const totalPages = Math.ceil(totalItem / limit);

    return {
        [dataKey]: resource,
        pagination: {
            total_item: totalItem,
            total_page: totalPages,
            current_page: currentPage,
            limit: parseInt(limit),
        },
    };
}

const error = (res, errorCode, message = null) => {
    const error = getErrorMessage(errorCode);

    return res.status(error.httpCode).json({
        success: false,
        message: message || error.message,
        error_code: errorCode,
        data: null,
    });
};

module.exports = {
    success,
    pagination,
    paginationResponse,
    failed,
    error,
};