/* model.js is where data is stored in a standard form, whatever the serializer */

IriSP.Model = {

    _SOURCE_STATUS_EMPTY : 0,

    _SOURCE_STATUS_WAITING : 1,

    _SOURCE_STATUS_READY : 2,

    _ID_AUTO_INCREMENT : 0,

    getUID : function() {

        return "autoid-" + (++this._ID_AUTO_INCREMENT);

    },

    regexpFromTextOrArray : function(_textOrArray) {

        function escapeText(_text) {

            return _text.replace(/([\\\*\+\?\|\{\[\}\]\(\)\^\$\.\#\/])/gm, '\\$1');

        }

        return new RegExp( '('

            + (

                typeof _textOrArray === "string"

                ? escapeText(_textOrArray)

                : IriSP._(_textOrArray).map(escapeText).join("|")

            )

            + ')',

            'gim'

        );

    },

    isoToDate : function(_str) {

        // http://delete.me.uk/2005/03/iso8601.html

        var regexp = "([0-9]{4})(-([0-9]{2})(-([0-9]{2})(T([0-9]{2}):([0-9]{2})(:([0-9]{2})(\.([0-9]+))?)?(Z|(([-+])([0-9]{2}):([0-9]{2})))?)?)?)?";

        var d = _str.match(new RegExp(regexp));

        var offset = 0;

        var date = new Date(d[1], 0, 1);

        if (d[3]) { date.setMonth(d[3] - 1); }

        if (d[5]) { date.setDate(d[5]); }

        if (d[7]) { date.setHours(d[7]); }

        if (d[8]) { date.setMinutes(d[8]); }

        if (d[10]) { date.setSeconds(d[10]); }

        if (d[12]) { date.setMilliseconds(Number("0." + d[12]) * 1000); }

        if (d[14]) {

            offset = (Number(d[16]) * 60) + Number(d[17]);

            offset *= ((d[15] == '-') ? 1 : -1);

        }

        offset -= date.getTimezoneOffset();

        time = (Number(date) + (offset * 60 * 1000));

        var _res = new Date();

        _res.setTime(Number(time));

        return _res;

    },

    dateToIso : function(d) {  

        function pad(n){return n<10 ? '0'+n : n}  

        return d.getUTCFullYear()+'-'  

            + pad(d.getUTCMonth()+1)+'-'  

            + pad(d.getUTCDate())+'T'  

            + pad(d.getUTCHours())+':'  

            + pad(d.getUTCMinutes())+':'  

            + pad(d.getUTCSeconds())+'Z'  

    }

}

/*

 * IriSP.Model.List is a class for a list of elements (e.g. annotations, medias, etc. that each have a distinct ID)

 */

IriSP.Model.List = function(_directory) {

    Array.call(this);

    this.directory = _directory;

    this.idIndex = [];

    if (typeof _directory == "undefined") {

        throw "Error : new IriSP.Model.List(directory): directory is undefined";

    }

}

IriSP.Model.List.prototype = new Array();

IriSP.Model.List.prototype.getElement = function(_id) {

    if (_index !== -1) {

        return this[_index];

    }

}

IriSP.Model.List.prototype.hasId = function(_id) {

    return (IriSP._(this.idIndex).indexOf(_id) !== -1);

}

/* On recent browsers, forEach and map are defined and do what we want.

 * Otherwise, we'll use the Underscore.js functions

 */

if (typeof Array.prototype.forEach === "undefined") {

    IriSP.Model.List.prototype.forEach = function(_callback) {

        var _this = this;

        IriSP._(this).forEach(function(_value, _key) {

            _callback(_value, _key, _this);

        });

    }

}

if (typeof Array.prototype.map === "undefined") {

    IriSP.Model.List.prototype.map = function(_callback) {

        var _this = this;

        return IriSP._(this).map(function(_value, _key) {

            return _callback(_value, _key, _this);

        });

    }

}

/* We override Array's filter function because it doesn't return an IriSP.Model.List

 */

IriSP.Model.List.prototype.filter = function(_callback) {

    var _this = this,

        _res = new IriSP.Model.List(this.directory);

    _res.addElements(IriSP._(this).filter(function(_value, _key) {

        return _callback(_value, _key, _this);

    }));

    return _res;

}

IriSP.Model.List.prototype.slice = function(_start, _end) {

    var _res = new IriSP.Model.List(this.directory);

    _res.addElements(Array.prototype.slice.call(this, _start, _end));

    return _res;

}

IriSP.Model.List.prototype.splice = function(_start, _end) {

    var _res = new IriSP.Model.List(this.directory);

    _res.addElements(Array.prototype.splice.call(this, _start, _end));

    this.idIndex.splice(_start, _end);

    return _res;

}

/* Array has a sort function, but it's not as interesting as Underscore.js's sortBy

 * and won't return a new IriSP.Model.List

 */

IriSP.Model.List.prototype.sortBy = function(_callback) {

    var _this = this,

        _res = new IriSP.Model.List(this.directory);

    _res.addElements(IriSP._(this).sortBy(function(_value, _key) {

        return _callback(_value, _key, _this);

    }));

    return _res;

}

/* Title and Description are basic information for (almost) all element types,

 * here we can search by these criteria

 */

IriSP.Model.List.prototype.searchByTitle = function(_text) {

    var _rgxp = IriSP.Model.regexpFromTextOrArray(_text);

    return this.filter(function(_element) {

        return _rgxp.test(_element.title);

    });

}

IriSP.Model.List.prototype.searchByDescription = function(_text) {

    var _rgxp = IriSP.Model.regexpFromTextOrArray(_text);

    return this.filter(function(_element) {

        return _rgxp.test(_element.description);

    });

}

IriSP.Model.List.prototype.searchByTextFields = function(_text) {

    var _rgxp =  IriSP.Model.regexpFromTextOrArray(_text);

    return this.filter(function(_element) {

        return _rgxp.test(_element.description) || _rgxp.test(_element.title);

    });

}

IriSP.Model.List.prototype.getTitles = function() {

    return this.map(function(_el) {

        return _el.title;

    });

}

IriSP.Model.List.prototype.addId = function(_id) {

    var _el = this.directory.getElement(_id)

    if (!this.hasId(_id) && typeof _el !== "undefined") {

        this.idIndex.push(_id);

        Array.prototype.push.call(this, _el);

    }

}

IriSP.Model.List.prototype.push = function(_el) {

    if (typeof _el === "undefined") {

        return;

    }

    var _index = (IriSP._(this.idIndex).indexOf(_el.id));

    if (_index === -1) {

        this.idIndex.push(_el.id);

        Array.prototype.push.call(this, _el);

    } else {

        this[_index] = _el;

    }

}

IriSP.Model.List.prototype.addIds = function(_array) {

    var _l = _array.length,

        _this = this;

    IriSP._(_array).forEach(function(_id) {

        _this.addId(_id);

    });

}

IriSP.Model.List.prototype.addElements = function(_array) {

    var _this = this;

    IriSP._(_array).forEach(function(_el) {

        _this.push(_el);

    });

}

IriSP.Model.List.prototype.removeId = function(_id) {

    var _index = (IriSP._(this.idIndex).indexOf(_id));

    if (_index !== -1) {

        this.splice(_index,1);

    }

}

IriSP.Model.List.prototype.removeElement = function(_el) {

    this.removeId(_el.id);

}

IriSP.Model.List.prototype.removeIds = function(_list) {

    var _this = this;

    IriSP._(_list).forEach(function(_id) {

        _this.removeId(_id);

    });

}

IriSP.Model.List.prototype.removeElements = function(_list) {

    var _this = this;

    IriSP._(_list).forEach(function(_el) {

        _this.removeElement(_el);

    });

}

/* A simple time management object, that helps converting millisecs to seconds and strings,

 * without the clumsiness of the original Date object.

 */

IriSP.Model.Time = function(_milliseconds) {

    this.milliseconds = parseInt(typeof _milliseconds !== "undefined" ? _milliseconds : 0);

}

IriSP.Model.Time.prototype.setSeconds = function(_seconds) {

    this.milliseconds = 1000 * _seconds;

}

IriSP.Model.Time.prototype.getSeconds = function() {

    return Math.floor(this.milliseconds / 1000);

}

IriSP.Model.Time.prototype.getHMS = function() {

    var _totalSeconds = Math.abs(this.getSeconds());

    return {

        hours : Math.floor(_totalSeconds / 3600),

        minutes : (Math.floor(_totalSeconds / 60) % 60),

        seconds : _totalSeconds % 60

    } 

}

IriSP.Model.Time.prototype.valueOf = function() {

    return this.milliseconds;

}

IriSP.Model.Time.prototype.toString = function() {

    function pad(_n) {

        var _res = _n.toString();

        while (_res.length < 2) {

            _res = '0' + _res;

        }

        return _res;

    }

    var _hms = this.getHMS(),

        _res = '';

    if (_hms.hours) {

        _res += pad(_hms.hours) + ':'

    }

    _res += pad(_hms.minutes) + ':' + pad(_hms.seconds);

    return _res;

}

/* IriSP.Model.Reference handles references between elements

 */

IriSP.Model.Reference = function(_source, _idRef) {

    this.source = _source;

    if (typeof _idRef === "object") {

        this.isList = true;

        this.id = IriSP._(_idRef).map(function(_id) {

            return _source.getNamespaced(_id).fullname;

        });

    } else {

        this.isList = false;

        this.id = _source.getNamespaced(_idRef).fullname;

    }

    this.refresh();

}

IriSP.Model.Reference.prototype.refresh = function() {

    if (this.isList) {

        this.contents = new IriSP.Model.List(this.source.directory);

        this.contents.addIds(this.id);

    } else {

        this.contents = this.source.directory.getElement(this.id);

    }

}

IriSP.Model.Reference.prototype.getContents = function() {

    if (typeof this.contents === "undefined" || (this.isList && this.contents.length != this.id.length)) {

        this.refresh();

    }

    return this.contents;

}

IriSP.Model.Reference.prototype.isOrHasId = function(_idRef) {

    if (this.isList) {

        return (IriSP._(this.id).indexOf(_idRef) !== -1)

    } else {

        return (this.id == _idRef);

    }