{% load avatar_tags %}
<img src="{% if url != "" %}{{ url }}{% endif %}" id="avatarImage" name="avatarForm" width="100" height="100" alt="profile picture" />
<form action="" method="POST" id="avatarForm" enctype="multipart/form-data">
    {% csrf_token %}
    <p id="uploadProgress" style="display: none;">upload progress</p>
    <progress id="progress" style="display: none;"></progress>
    <label for="file">Change Avatar:</label><input type="file" name="file" id="file" />
</form>
<div class="avatarMessage"></div>

<script type="text/javascript">
$(':file').change(function(){
    var file = this.files[0];
    var size = file.size;
    var type = file.type;
    //Your validation
    if (CheckFileType(type) != true) {
        $('.avatarMessage').html("<span class='error'>I'm sorry we do not support this type of file.  We currently only support the following formats .jpg, .png, .bmp, .jpeg</span>");
    }
    else {
        if (CheckFileSize(size) == false) {
            $('.avatarMessage').html("<span class='error'>I'm sorry the file must be less than 1MB. </span>");
        } else {
            UploadAvatar();
        }
    }
});

// supported file types
function CheckFileType(type) {
    // four default filetypes
    var fileTypes = ["image/jpg", "image/png", "image/gif", "image/bmp", "image/jpeg"];
    var i;
    for (i = 0; i < fileTypes.length; i++) {
        if (fileTypes[i] === type) {
            return true;
        }
    }
    return false;
}

function CheckFileSize(size) {
    if (size < 1048576) {
        return true;
    } else {
        return false;
    }
}

function progressHandlingFunction(e){
        if(e.lengthComputable){
            $('progress').attr({value:e.loaded,max:e.total});
        }
}

function csrfSafeMethod(method) {
    // these HTTP methods do not require CSRF protection
    return (/^(GET|HEAD|OPTIONS|TRACE)$/.test(method));
}
function sameOrigin(url) {
    // test that a given url is a same-origin URL
    // url could be relative or scheme relative or absolute
    var host = document.location.host; // host + port
    var protocol = document.location.protocol;
    var sr_origin = '//' + host;
    var origin = protocol + sr_origin;
    // Allow absolute or scheme relative URLs to same origin
    return (url == origin || url.slice(0, origin.length + 1) == origin + '/') ||
        (url == sr_origin || url.slice(0, sr_origin.length + 1) == sr_origin + '/') ||
        // or any other URL that isn't scheme relative or absolute i.e relative.
        !(/^(\/\/|http:|https:).*/.test(url));
}

// using jQuery
function getCookie(name) {
    var cookieValue = null;
    if (document.cookie && document.cookie != '') {
        var cookies = document.cookie.split(';');
        for (var i = 0; i < cookies.length; i++) {
            var cookie = jQuery.trim(cookies[i]);
            // Does this cookie string begin with the name we want?
            if (cookie.substring(0, name.length + 1) == (name + '=')) {
                cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
                break;
            }
        }
    }
    return cookieValue;
}


function UploadAvatar() {
    $('#progress').css('display', 'inherit');
    $('#uploadProgress').css('display', 'inherit');
    // var formDataIndex = $("#avatarForm").index();
    var formData = new FormData($('#avatarForm')[0]);
    var csrftoken = getCookie('csrftoken');
    $.ajax({
        beforeSend: function(xhr, settings) {
            if (!csrfSafeMethod(settings.type) && sameOrigin(settings.url)) {
                // Send the token to same-origin, relative URLs only.
                // Send the token only if the method warrants CSRF protection
                // Using the CSRFToken value acquired earlier
                xhr.setRequestHeader("X-CSRFToken", csrftoken);
            }
        },
        url: '/avatar/upload/', //Server script to process data
        type: 'POST',
        xhr: function() { // Custom XMLHttpRequest
            var myXhr = $.ajaxSettings.xhr();
            if (myXhr.upload) { // Check if upload property exists
                myXhr.upload.addEventListener('progress', progressHandlingFunction, false); // For handling the progress of the upload
            }
            return myXhr;
        },
        //Ajax events
        success: function(res) {
            $(".avatarMessage").html(res.message);
            $("#avatarImage").attr("src", res.image_url);
        },
        // Form data
        data: formData,
        //Options to tell jQuery not to process data or worry about content-type.
        cache: false,
        contentType: false,
        processData: false
    });
}


</script>