/*
 Simple OpenID Plugin
 http://code.google.com/p/openid-selector/

 This code is licensed under the New BSD License.
 */

var providers;
var openid;
(function ($) {
    openid = {
        version: '1.3', // version constant
        demo: false,
        demo_text: null,
        cookie_expires: 6 * 30, // 6 months.
        cookie_name: 'openid_provider',
        cookie_path: '/',

        img_path: 'images/',
        locale: null, // is set in openid-<locale>.js
        sprite: null, // usually equals to locale, is set in
        // openid-<locale>.js
        signin_text: null, // text on submit button on the form
        all_small: false, // output large providers w/ small icons
        no_sprite: false, // don't use sprite image
        image_title: '{provider}', // for image title

        input_id: null,
        provider_url: null,
        provider_id: null,

        /**
         * Class constructor
         *
         * @return {Void}
         */
        init: function (input_id) {
            providers = $.extend({}, providers_large, providers_small);
            var openid_btns = $('#openid_btns');
            this.input_id = input_id;
            $('#openid_choice').show();
            $('#openid_input_area').empty();
            var i = 0;
            // add box for each provider
            var id, box;
            for (id in providers_large) {
                box = this.getBoxHTML(id, providers_large[id], (this.all_small ? 'small' : 'large'), i++);
                openid_btns.append(box);
            }
            if (providers_small) {
                openid_btns.append('<br/>');
                for (id in providers_small) {
                    box = this.getBoxHTML(id, providers_small[id], 'small', i++);
                    openid_btns.append(box);
                }
            }
            $('#openid_form').submit(this.submit);
            var box_id = this.readCookie();
            if (box_id) {
                this.signin(box_id, true);
            }
        },

        /**
         * @return {String}
         */
        getBoxHTML: function (box_id, provider, box_size, index) {
            if (this.no_sprite) {
                var image_ext = box_size == 'small' ? '.ico.gif' : '.gif';
                return '<a title="' + this.image_title.replace('{provider}', provider.name) + '" href="javascript:openid.signin(\'' + box_id + '\');"'
                    + ' style="background: #FFF url(' + this.img_path + '../images.' + box_size + '/' + box_id + image_ext + ') no-repeat center center" '
                    + 'class="' + box_id + ' openid_' + box_size + '_btn"></a>';
            }
            var x = box_size == 'small' ? -index * 24 : -index * 100;
            var y = box_size == 'small' ? -60 : 0;
            return '<a title="' + this.image_title.replace('{provider}', provider.name) + '" href="javascript:openid.signin(\'' + box_id + '\');"'
                + ' style="background: #FFF url(' + this.img_path + 'openid-providers-' + this.sprite + '.png); background-position: ' + x + 'px ' + y + 'px" '
                + 'class="' + box_id + ' openid_' + box_size + '_btn"></a>';
        },

        /**
         * Provider image click
         *
         * @return {Void}
         */
        signin: function (box_id, onload) {
            var provider = providers[box_id];
            if (!provider) {
                return;
            }
            this.highlight(box_id);
            this.setCookie(box_id);
            this.provider_id = box_id;
            this.provider_url = provider.url;
            // prompt user for input?
            if (provider.label) {
                this.useInputBox(provider);
            } else {
                $('#openid_input_area').empty();
                if (!onload) {
                    $('#openid_form').submit();
                }
            }
        },

        /**
         * Sign-in button click
         *
         * @return {Boolean}
         */
        submit: function () {
            var url = openid.provider_url;
            if (url) {
                url = url.replace('{username}', $('#openid_username').val());
                openid.setOpenIdUrl(url);
            }
            if (openid.demo) {
                alert(openid.demo_text + "\r\n" + document.getElementById(openid.input_id).value);
                return false;
            }
            if (url && url.indexOf("javascript:") == 0) {
                url = url.substr("javascript:".length);
                eval(url);
                return false;
            }
            return true;
        },

        /**
         * @return {Void}
         */
        setOpenIdUrl: function (url) {
            var hidden = document.getElementById(this.input_id);
            if (hidden != null) {
                hidden.value = url;
            } else {
                $('#openid_form').append('<input type="hidden" id="' + this.input_id + '" name="' + this.input_id + '" value="' + url + '"/>');
            }
        },

        /**
         * @return {Void}
         */
        highlight: function (box_id) {
            // remove previous highlight.
            var highlight = $('#openid_highlight');
            if (highlight) {
                highlight.replaceWith($('#openid_highlight a')[0]);
            }
            // add new highlight.
            $('.' + box_id).wrap('<div id="openid_highlight"></div>');
        },

        setCookie: function (value) {
            var date = new Date();
            date.setTime(date.getTime() + (this.cookie_expires * 24 * 60 * 60 * 1000));
            var expires = "; expires=" + date.toGMTString();
            document.cookie = this.cookie_name + "=" + value + expires + "; path=" + this.cookie_path;
        },

        readCookie: function () {
            var nameEQ = this.cookie_name + "=";
            var ca = document.cookie.split(';');
            for (var i = 0; i < ca.length; i++) {
                var c = ca[i];
                while (c.charAt(0) == ' ')
                    c = c.substring(1, c.length);
                if (c.indexOf(nameEQ) == 0)
                    return c.substring(nameEQ.length, c.length);
            }
            return null;
        },

        /**
         * @return {Void}
         */
        useInputBox: function (provider) {
            var input_area = $('#openid_input_area');
            var html = '';
            var id = 'openid_username';
            var value = '';
            var label = provider.label;
            var style = '';
            if (label) {
                html = '<p>' + label + '</p>';
            }
            if (provider.name == 'OpenID') {
                id = this.input_id;
                value = 'http://';
                style = 'background: #FFF url(' + this.img_path + 'openid-inputicon.gif) no-repeat scroll 0 50%; padding-left:18px;';
            }
            html += '<input id="' + id + '" type="text" style="' + style + '" name="' + id + '" value="' + value + '" />'
                + '<input id="openid_submit" type="submit" value="' + this.signin_text + '"/>';
            input_area.empty();
            input_area.append(html);
            $('#' + id).focus();
        },

        setDemoMode: function (demoMode) {
            this.demo = demoMode;
        }
    };
})(jQuery);