/* global alertify, store */
var feature = {
    addEventListener : !!window.addEventListener,
    querySelectorAll : !!document.querySelectorAll
};

if (feature.addEventListener && feature.querySelectorAll) {
    var keys = getKeys();
    for (var i = 0; i < keys.length; i++) {
        if (store.get(keys[i])) {
            var formId = keys[i].split('~')[1];
            document.getElementById(formId).value = store.get(keys[i]);
        }
    }
}

var timerId = window.setInterval(function() {
    var saved = false;
    var inputs = document.querySelectorAll('input[type=text], textarea');
    for (var i = 0; i < inputs.length; i++) {
        var key = getFormElement(inputs[i]).id + '~' + inputs[i].id;
        if (store.get(key) !== inputs[i].value && inputs[i].value !== '') {
            store.set(key, inputs[i].value);
            saved = true;
        }
    }
    if (saved === true) {
        alertify.logPosition('top right');
        alertify.success('Auto saved text');
    }
}, 5000);
var forms = document.querySelectorAll('form');
for (var f = 0; f < forms.length; f++) {
    var form = forms[f];
    form.addEventListener('submit', function() {
        window.clearInterval(timerId);
        var formId = form.id;
        var storedKeys = store.keys();
        for (var i = 0; i < storedKeys.length; i++) {
            if (storedKeys[i].indexOf(formId) > -1) {
                store.remove(storedKeys[i]);
            }
        }
    });
}
function getKeys() {
    var keys = [];
    var formFields = document.querySelectorAll('input[type=text], textarea');
    for (var f = 0; f < formFields.length; f++) {
        var parent = getFormElement(formFields[f]);
        if (parent !== false) {
            var key = parent.id + '~' + formFields[f].id;
            keys.push(key);
        }
    }
    return keys;
}
function getFormElement(elem) {
    if (elem.nodeName.toLowerCase() !== 'body') {
        var parent = elem.parentNode;
        if (parent.nodeName.toLowerCase() === 'form') {
            return parent;
        } else {
            return getFormElement(parent);
        }
    } else {
        return false;
    }
}