function calculation_bw () {
    let width = document.getElementById('box_unit_width').value;
    let length = document.getElementById('box_unit_length').value;
    let height = document.getElementById('box_unit_height').value;
    let wType = document.querySelector(`input[name="box_radio"]:checked`).value;
    let result = 0;
    let targetInput = document.getElementById('weight');
    if (checkVariables(width, length, height)) {
        if (wType === 'kg') {
            result = ((width * height * length) / 6000).toFixed(3) + '  KG';
        } else {
            result = ((width * height * length) / 166).toFixed(3) + '  ib';
        }
    } else {
        alert('입력값을 확인하세요');
        return false;
    }

    targetInput.value = result;
}

function calculation_cw () {
    let width = document.getElementById('cy_unit_width').value;
    let length = document.getElementById('cy_unit_length').value;
    let wType = document.querySelector(`input[name="cy_radio"]:checked`).value;
    let result = 0;
    let targetInput = document.getElementById('weight2');
    if (checkVariables(width, length)) {
        if (wType === 'kg') {
            result = (((Math.round(width * width * Math.PI * 1000) / 1000) * length) / 6000).toFixed(3) + '  KG';
        } else {
            result = (((Math.round(width * width * Math.PI * 1000) / 1000) * length) / 166).toFixed(3) + '  ib';
        }
    } else {
        alert('입력값을 확인하세요');
        return false;
    }

    targetInput.value = result;
}


function calculation_bc () {
    let width = document.getElementById('box_unit_width1').value;
    let length = document.getElementById('box_unit_length1').value;
    let height = document.getElementById('box_unit_height1').value;
    let count = document.getElementById('box_unit_count').value;
    let wType = document.querySelector(`input[name="box_radio1"]:checked`).value;
    let result = 0;
    let targetInput = document.getElementById('weight3');
    if (checkVariables(width, length, height)) {
        if (wType === 'kg') {
            result = ((width * height * length) / 1000000).toFixed(3) + '  CBM';
        } else {
            result = (((width * height * length) / 1728) / 35.3147).toFixed(3) + '  CBM';
        }
    } else {
        alert('입력값을 확인하세요');
        return false;
    }

    targetInput.value = result;
}

function calculation_cc () {
    let width = document.getElementById('box_unit_width1').value;
    let length = document.getElementById('box_unit_length1').value;
    let height = document.getElementById('box_unit_height1').value;
    let count = document.getElementById('box_unit_count').value;
    let wType = document.querySelector(`input[name="box_radio1"]:checked`).value;
    let result = 0;
    let targetInput = document.getElementById('weight4');
    if (checkVariables(width, length, height)) {
        if (wType === 'kg') {
            result = (((Math.round(width * width * Math.PI * 1000) / 1000) * length) / 1000000).toFixed(3) + '  CBM';
        } else {
            result = (((width * height * length) / 1728) / 35.3147).toFixed(3) + '  CBM';
        }
    } else {
        alert('입력값을 확인하세요');
        return false;
    }

    targetInput.value = result;
}


function checkVariables() {
    for (let i = 0; i < arguments.length; i++) {
        // 변수가 null 또는 undefined이면 false 반환
        if (arguments[i] === null || arguments[i] === undefined) {
            return false;
        }
        // 변수가 숫자가 아니면 false 반환
        if (isNaN(arguments[i])) {
            return false;
        }
    }
    // 모든 변수가 조건을 만족하면 true 반환
    return true;
}