const form = document.getElementById('form');
const corporate = document.getElementById('title');
const username = document.getElementById('name');
const contact_type = document.getElementById('contact_type');
const phone = document.getElementById('contact');
const message = document.getElementById('content');
const yzm = document.getElementById('captcha');

form.addEventListener('submit', e => {
    e.preventDefault();
    if (checkInputs()){
        form.submit();
    }
});

function checkInputs() {
    const corporateValue = corporate.value.trim();
    const usernameValue = username.value.trim();
    const contact_typeValue = contact_type.value.trim();
    const phoneValue = phone.value.trim();
    const messageValue = message.value.trim();
    const yzmValue = yzm.value.trim();
    
    if(corporateValue === '') {
        setErrorFor(corporate, '公司名称/标题不能为空');
        return false;
    } else {
        setSuccessFor(corporate);
    }

    if(usernameValue === '') {
        setErrorFor(username, '联系人不能为空');
        return false;
    } else {
        setSuccessFor(username);
    }

    if(contact_typeValue === '') {
        setErrorFor(contact_type, '请选择回复方式');
        return false;
    } else {
        setSuccessFor(contact_type);
    }

    if(phoneValue === '') {
        setErrorFor(phone, '联系方式不能为空');
        return false;
    } else {
        setSuccessFor(phone);
    }

    if(messageValue === '') {
        setErrorFor(message, '留言内容不能为空');
        return false;
    } else {
        setSuccessFor(message);
    }
    
    if(yzmValue === '') {
        setErrorFor(yzm, '验证码不能为空');
        return false;
    } else {
        setSuccessFor(yzm);
    }
    return true;
}

function setErrorFor(input, message) {
    const formControl = input.parentElement;
    const small = formControl.querySelector('small');
    formControl.className = 'form-control error';
    small.innerText = message;
}

function setSuccessFor(input) {
    const formControl = input.parentElement;
    formControl.className = 'form-control success';
}
    
function isEmail(email) {
    return /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/.test(email);
}

/**
 +----------------------------------------------------------
 * 刷新验证码
 +----------------------------------------------------------
 */
function refreshimage() {
    var cap = document.getElementById("vcode");
    cap.src = cap.src + '?';
}