/*
    Copyright 2012 Rustici Software

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/

/**
TinCan client library

@module TinCan
@submodule TinCan.SubStatement
**/
(function () {
    "use strict";

    /**
    @class TinCan.SubStatement
    @constructor
    @param {Object} [cfg] Configuration used to initialize.
        @param {TinCan.Agent} [cfg.actor] Actor of statement
        @param {TinCan.Verb} [cfg.verb] Verb of statement
        @param {TinCan.Activity|TinCan.Agent} [cfg.object] Alias for 'target'
        @param {TinCan.Activity|TinCan.Agent} [cfg.target] Object of statement
        @param {TinCan.Result} [cfg.result] Statement Result
        @param {TinCan.Context} [cfg.context] Statement Context
    **/
    var SubStatement = TinCan.SubStatement = function (cfg) {
        this.log("constructor");

        /**
        @property actor
        @type Object
        */
        this.actor = null;

        /**
        @property verb
        @type Object
        */
        this.verb = null;

        /**
        @property target
        @type Object
        */
        this.target = null;

        /**
        @property result
        @type Object
        */
        this.result = null;

        /**
        @property context
        @type Object
        */
        this.context = null;

        /**
        @property timestamp
        @type Date
        */
        this.timestamp = null;

        this.init(cfg);
    };

    SubStatement.prototype = {
        /**
        @property objectType
        @type String
        @default Agent
        */
        objectType: "SubStatement",

        /**
        @property LOG_SRC
        */
        LOG_SRC: "SubStatement",

        /**
        @method log
        */
        log: TinCan.prototype.log,

        /**
        @method init
        @param {Object} [options] Configuration used to initialize (see constructor)
        */
        init: function (cfg) {
            this.log("init");
            var i,
                directProps = [
                    "timestamp"
                ];

            cfg = cfg || {};

            if (cfg.hasOwnProperty("object")) {
                cfg.target = cfg.object;
            }

            if (cfg.hasOwnProperty("actor")) {
                if (typeof cfg.actor.objectType === "undefined" || cfg.actor.objectType === "Person") {
                    cfg.actor.objectType = "Agent";
                }

                if (cfg.actor.objectType === "Agent") {
                    if (cfg.actor instanceof TinCan.Agent) {
                        this.actor = cfg.actor;
                    } else {
                        this.actor = new TinCan.Agent (cfg.actor);
                    }
                } else if (cfg.actor.objectType === "Group") {
                    if (cfg.actor instanceof TinCan.Group) {
                        this.actor = cfg.actor;
                    } else {
                        this.actor = new TinCan.Group (cfg.actor);
                    }
                }
            }
            if (cfg.hasOwnProperty("verb")) {
                if (cfg.verb instanceof TinCan.Verb) {
                    this.verb = cfg.verb;
                } else {
                    this.verb = new TinCan.Verb (cfg.verb);
                }
            }
            if (cfg.hasOwnProperty("target")) {
                if (cfg.target instanceof TinCan.Activity ||
                    cfg.target instanceof TinCan.Agent ||
                    cfg.target instanceof TinCan.Group ||
                    cfg.target instanceof TinCan.SubStatement ||
                    cfg.target instanceof TinCan.StatementRef
                ) {
                    this.target = cfg.target;
                } else {
                    if (typeof cfg.target.objectType === "undefined") {
                        cfg.target.objectType = "Activity";
                    }

                    if (cfg.target.objectType === "Activity") {
                        this.target = new TinCan.Activity (cfg.target);
                    } else if (cfg.target.objectType === "Agent") {
                        this.target = new TinCan.Agent (cfg.target);
                    } else if (cfg.target.objectType === "Group") {
                        this.target = new TinCan.Group (cfg.target);
                    } else if (cfg.target.objectType === "SubStatement") {
                        this.target = new TinCan.SubStatement (cfg.target);
                    } else if (cfg.target.objectType === "StatementRef") {
                        this.target = new TinCan.StatementRef (cfg.target);
                    } else {
                        this.log("Unrecognized target type: " + cfg.target.objectType);
                    }
                }
            }
            if (cfg.hasOwnProperty("result")) {
                if (cfg.result instanceof TinCan.Result) {
                    this.result = cfg.result;
                } else {
                    this.result = new TinCan.Result (cfg.result);
                }
            }
            if (cfg.hasOwnProperty("context")) {
                if (cfg.context instanceof TinCan.Context) {
                    this.context = cfg.context;
                } else {
                    this.context = new TinCan.Context (cfg.context);
                }
            }

            for (i = 0; i < directProps.length; i += 1) {
                if (cfg.hasOwnProperty(directProps[i]) && cfg[directProps[i]] !== null) {
                    this[directProps[i]] = cfg[directProps[i]];
                }
            }
        },

        /**
        @method toString
        @return {String} String representation of the statement
        */
        toString: function (lang) {
            this.log("toString");
            return (this.actor !== null ? this.actor.toString(lang) : "") +
                    " " +
                    (this.verb !== null ? this.verb.toString(lang) : "") +
                    " " +
                    (this.target !== null ? this.target.toString(lang) : "");
        },

        /**
        @method asVersion
        @param {String} [version] Version to return (defaults to newest supported)
        */
        asVersion: function (version) {
            this.log("asVersion");
            var result,
                optionalDirectProps = [
                    "timestamp"
                ],
                optionalObjProps = [
                    "actor",
                    "verb",
                    "result",
                    "context"
                ],
                i;

            result = {
                objectType: this.objectType
            };
            version = version || TinCan.versions()[0];

            for (i = 0; i < optionalDirectProps.length; i += 1) {
                if (this[optionalDirectProps[i]] !== null) {
                    result[optionalDirectProps[i]] = this[optionalDirectProps[i]];
                }
            }
            for (i = 0; i < optionalObjProps.length; i += 1) {
                if (this[optionalObjProps[i]] !== null) {
                    result[optionalObjProps[i]] = this[optionalObjProps[i]].asVersion(version);
                }
            }
            if (this.target !== null) {
                result.object = this.target.asVersion(version);
            }

            if (version === "0.9") {
                result.objectType = "Statement";
            }

            return result;
        }
    };

    /**
    @method fromJSON
    @return {Object} SubStatement
    @static
    */
    SubStatement.fromJSON = function (subStJSON) {
        SubStatement.prototype.log("fromJSON");
        var _subSt = JSON.parse(subStJSON);

        return new SubStatement(_subSt);
    };
}());