/*  Authors:
 *    Pavel Zuna <pzuna@redhat.com>
 *
 * Copyright (C) 2010 Red Hat
 * see file 'COPYING' for use and warranty information
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; version 2 only
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/

/* IPA JSON-RPC helper */

var IPA_DEFAULT_JSON_URL = '/ipa/json';

/* JSON-RPC ID counter */
var ipa_jsonrpc_id = 0;

var IPA = function() {

    var that = {};

    that.json_url = null;
    that.use_static_files = false;

    that.ajax_options = {
        type: 'POST',
        contentType: 'application/json',
        dataType: 'json',
        async: true,
        processData: false
    };

    that.messages = {};
    that.metadata = {};

    that.entities = [];
    that.entities_by_name = {};

    that.error_dialog = $('<div/>', {
        id: 'error_dialog'
    });

    /* initialize the IPA JSON-RPC helper
     * arguments:
     *   url - JSON-RPC URL to use (optional) */
    that.init = function(url, use_static_files, on_success, on_error) {
        if (url)
            that.json_url = url;

        if (use_static_files)
            that.use_static_files = use_static_files;

        $.ajaxSetup(that.ajax_options);

        ipa_cmd('json_metadata', [], {},
            function(data, text_status, xhr) {
                that.metadata = data.result.metadata;
                that.messages = data.result.messages;
                if (on_success) on_success(data, text_status, xhr);
            },
            on_error
        );
    };

    that.get_entities = function() {
        return that.entities;
    };

    that.get_entity = function(name) {
        return that.entities_by_name[name];
    };

    that.add_entity = function(entity) {
        that.entities.push(entity);
        that.entities_by_name[entity.name] = entity;
    };

    that.show_page = function(entity_name, facet_name, other_entity) {

        var entity = IPA.get_entity(entity_name);
        var facet = entity.get_facet(facet_name);

        var state = {};
        state[entity_name + '-facet'] = facet_name;
        state[entity_name + '-enroll'] = other_entity ? other_entity : '';
        $.bbq.pushState(state);
    };

    return that;
}();

/* call an IPA command over JSON-RPC
 * arguments:
 *   name - name of the command or method if objname is set
 *   args - list of positional arguments, e.g. [username]
 *   options - dict of options, e.g. {givenname: 'Pavel'}
 *   win_callback - function to call if the JSON request succeeds
 *   fail_callback - function to call if the JSON request fails
 *   objname - name of an IPA object (optional) */
function ipa_cmd(name, args, options, win_callback, fail_callback, objname)
{
    function ipa_success_handler(data, text_status, xhr) {
        if (!data) {
            var error_thrown = {
                name: 'HTTP Error '+xhr.status,
                message: data ? xhr.statusText : "No response"
            };
            ipa_error_handler.call(this, xhr, text_status, error_thrown);

        } else if (data.error) {
            var error_thrown = {
                name: 'IPA Error '+data.error.code,
                message: data.error.message
            };
            ipa_error_handler.call(this, xhr, text_status, error_thrown);

        } else if (win_callback) {
            win_callback.call(this, data, text_status, xhr);
        }
    }

    function ipa_error_handler(xhr, text_status, error_thrown) {
        IPA.error_dialog.empty();
        IPA.error_dialog.attr('title', 'Error: '+error_thrown.name);

        IPA.error_dialog.append('<p>URL: '+this.url+'</p>');
        if (error_thrown.message) {
            IPA.error_dialog.append('<p>'+error_thrown.message+'</p>');
        }

        var that = this;

        IPA.error_dialog.dialog({
            modal: true,
            width: 400,
            buttons: {
                'Retry': function() {
                    IPA.error_dialog.dialog('close');
                    ipa_cmd(name, args, options, win_callback, fail_callback, objname);
                },
                'Cancel': function() {
                    IPA.error_dialog.dialog('close');
                    fail_callback.call(that, xhr, text_status, error_thrown);
                }
            }
        });
    }

    var id = ipa_jsonrpc_id++;

    var method_name = name;

    if (objname)
        method_name = objname + '_' + name;

    var url = IPA.json_url;

    if (!url)
        url = IPA_DEFAULT_JSON_URL;

    if (IPA.use_static_files)
        url += '/' + method_name + '.json';

    var data = {
        method: method_name,
        params: [args, options],
        id: id
    };

    var request = {
        url: url,
        data: JSON.stringify(data),
        success: ipa_success_handler,
        error: ipa_error_handler
    };

    $.ajax(request);

    return (id);
}

/* parse query string into key:value dict
 * arguments:
 *   qs - query string (optional) */
function ipa_parse_qs(qs)
{
    var dict = {};

    if (!qs)
        qs = location.hash.substring(1);
    qs = qs.replace(/\+/g, ' ');

    var args = qs.split('&');
    for (var i = 0; i < args.length; ++i) {
        var parts = args[i].split('=', 2);
        var key = decodeURIComponent(parts[0]);
    if (parts.length == 2)
        dict[key] = decodeURIComponent(parts[1]);
    else
        dict[key] = key;
    }

    return (dict);
}

/* helper function used to retrieve information about an attribute */
function ipa_get_param_info(obj_name, attr)
{
    var ipa_obj = IPA.metadata[obj_name];
    if (!ipa_obj) return null;

    var takes_params = ipa_obj.takes_params;
    if (!takes_params)
        return (null);

    for (var i = 0; i < takes_params.length; ++i) {
        if (takes_params[i]['name'] == attr)
            return (takes_params[i]);
    }

    return (null);
}

/* helper function used to retrieve attr name with members of type `member` */
function ipa_get_member_attribute(obj_name, member)
{
    var ipa_obj = IPA.metadata[obj_name];
    if (!ipa_obj) return null;

    var attribute_members = ipa_obj.attribute_members;
    for (var a in attribute_members) {
        var objs = attribute_members[a];
        for (var i = 0; i < objs.length; ++i) {
            if (objs[i] == member)
                return a;
        }
    }

    return null;
}