/**

 * This file contains extensions for standard javascript types

 *

 */

ONE_DAY = 86400000; // (in milliseconds)

// ========== DATE EXTENSIONS ========== ///

Date.prototype.equals = function(other) {

    /* compare with other date ignoring time differences */

    if (this.getYear() == other.getYear() && this.getMonth() == other.getMonth() && this.getDate() == other.getDate()) {

        return true;

    }

    return false;

};

Date.prototype.add = function(days) {

    var res = new Date();

    res.setTime(this.getTime() + (days * ONE_DAY));

    return res;

};

Date.prototype.sub = function(days) {

    return this.add( - days);

};

Date.prototype.iadd = function(days) {

    // in-place add

    this.setTime(this.getTime() + (days * ONE_DAY));

    // avoid strange rounding problems !!

    this.setHours(12);

};

Date.prototype.isub = function(days) {

    // in-place sub

    this.setTime(this.getTime() - (days * ONE_DAY));

};

/**

 * .. function:: Date.prototype.nextMonth()

 *

 * returns the first day of the next month

 */

Date.prototype.nextMonth = function() {

    if (this.getMonth() == 11) {

        var d = new Date(this.getFullYear() + 1, 0, 1);

        return d;

    } else {

        var d2 = new Date(this.getFullYear(), this.getMonth() + 1, 1);

        return d2;

    }

};

/**

 * .. function:: Date.prototype.getRealDay()

 *

 * returns the day of week, 0 being monday, 6 being sunday

 */

Date.prototype.getRealDay = function() {

    // getDay() returns 0 for Sunday ==> 6 for Saturday

    return (this.getDay() + 6) % 7;

};

Date.prototype.strftime = function(fmt) {

    if (this.toLocaleFormat !== undefined) { // browser dependent

        return this.toLocaleFormat(fmt);

    }

    // XXX implement at least a decent fallback implementation

    return this.getFullYear() + '/' + (this.getMonth() + 1) + '/' + this.getDate();

};

var _DATE_FORMAT_REGXES = {

    'Y': new RegExp('^-?[0-9]+'),

    'd': new RegExp('^[0-9]{1,2}'),

    'm': new RegExp('^[0-9]{1,2}'),

    'H': new RegExp('^[0-9]{1,2}'),

    'M': new RegExp('^[0-9]{1,2}')

};

/**

 * .. function:: _parseDate(datestring, format)

 *

 * _parseData does the actual parsing job needed by `strptime`

 */

function _parseDate(datestring, format) {

    var skip0 = new RegExp('^0*[0-9]+');

    var parsed = {};

    for (var i1 = 0, i2 = 0; i1 < format.length; i1++, i2++) {

        var c1 = format.charAt(i1);

        var c2 = datestring.charAt(i2);

        if (c1 == '%') {

            c1 = format.charAt(++i1);

            var data = _DATE_FORMAT_REGXES[c1].exec(datestring.substring(i2));

            if (!data.length) {

                return null;

            }

            data = data[0];

            i2 += data.length - 1;

            var value = parseInt(data, 10);

            if (isNaN(value)) {

                return null;

            }

            parsed[c1] = value;

            continue;

        }

        if (c1 != c2) {

            return null;

        }

    }

    return parsed;

}

/**

 * .. function:: strptime(datestring, format)

 *

 * basic implementation of strptime. The only recognized formats

 * defined in _DATE_FORMAT_REGEXES (i.e. %Y, %d, %m, %H, %M)

 */

function strptime(datestring, format) {

    var parsed = _parseDate(datestring, format);

    if (!parsed) {

        return null;

    }

    // create initial date (!!! year=0 means 1900 !!!)

    var date = new Date(0, 0, 1, 0, 0);

    date.setFullYear(0); // reset to year 0

    if (parsed.Y) {

        date.setFullYear(parsed.Y);

    }

    if (parsed.m) {

        if (parsed.m < 1 || parsed.m > 12) {

            return null;

        }

        // !!! month indexes start at 0 in javascript !!!

        date.setMonth(parsed.m - 1);

    }

    if (parsed.d) {

        if (parsed.m < 1 || parsed.m > 31) {

            return null;

        }

        date.setDate(parsed.d);

    }

    if (parsed.H) {

        if (parsed.H < 0 || parsed.H > 23) {

            return null;

        }

        date.setHours(parsed.H);

    }

    if (parsed.M) {

        if (parsed.M < 0 || parsed.M > 59) {

            return null;

        }

        date.setMinutes(parsed.M);

    }

    return date;

}

// ========== END OF DATE EXTENSIONS ========== ///

// ========== STRING EXTENSIONS ========== //

/**

 * .. function:: String.prototype.startswith(prefix)

 *

 * python-like startsWith method for js strings

 * >>>

 */

String.prototype.startswith = function(prefix) {

    return this.indexOf(prefix) == 0;

};

/**

 * .. function:: String.prototype.endswith(suffix)

 *

 * python-like endsWith method for js strings

 */

String.prototype.endswith = function(suffix) {

    var startPos = this.length - suffix.length;

    if (startPos < 0) {

        return false;

    }

    return this.lastIndexOf(suffix, startPos) == startPos;

};

/**

 * .. function:: String.prototype.strip()

 *

 * python-like strip method for js strings

 */

String.prototype.strip = function() {

    return this.replace(/^\s*(.*?)\s*$/, "$1");

};

// ========= class factories ========= //

/**

 * .. function:: makeUnboundMethod(meth)

 *

 * transforms a function into an unbound method

 */

function makeUnboundMethod(meth) {

    function unboundMeth(self) {

        var newargs = cw.utils.sliceList(arguments, 1);

        return meth.apply(self, newargs);

    }

    unboundMeth.__name__ = meth.__name__;

    return unboundMeth;

}

function attachMethodToClass(cls, methname, meth) {

    meth.__name__ = methname;

    // XXX : this is probably bad for memory usage

    cls.__dict__[methname] = meth;

    cls[methname] = makeUnboundMethod(meth); // for the class itself

    cls.prototype[methname] = meth; // for the instance

}

/**

 * .. function:: _isAttrSkipped(attrname)

 *

 * simple internal function that tells if the attribute should

 * be copied from baseclasses or not

 */

function _isAttrSkipped(attrname) {

    var skipped = ['__class__', '__dict__', '__bases__', 'prototype'];

    for (var i = 0; i < skipped.length; i++) {

        if (skipped[i] == attrname) {

            return true;

        }

    }

    return false;

}

/**

 * .. function:: makeConstructor(userctor)

 *

 * internal function used to build the class constructor

 */

function makeConstructor(userctor) {

    return function() {

        // this is a proxy to user's __init__

        if (userctor) {

            userctor.apply(this, arguments);

        }

    };

}

/**

 * .. function:: defclass(name, bases, classdict)

 *

 * this is a js class factory. objects returned by this function behave

 * more or less like a python class. The `class` function prototype is

 * inspired by the python `type` builtin

 * Important notes :

 *  -> methods are _STATICALLY_ attached when the class it created

 *  -> multiple inheritance was never tested, which means it doesn't work ;-)

 */

function defclass(name, bases, classdict) {

    var baseclasses = bases || [];

    // this is the static inheritance approach (<=> differs from python)

    var basemeths = {};

    var reverseLookup = [];

    for (var i = baseclasses.length - 1; i >= 0; i--) {

        reverseLookup.push(baseclasses[i]);

    }

    reverseLookup.push({

        '__dict__': classdict

    });

    for (var i = 0; i < reverseLookup.length; i++) {

        var cls = reverseLookup[i];

        for (prop in cls.__dict__) {

            // XXX hack to avoid __init__, __bases__...

            if (!_isAttrSkipped(prop)) {

                basemeths[prop] = cls.__dict__[prop];

            }

        }

    }

    var userctor = basemeths['__init__'];

    var constructor = makeConstructor(userctor);

    // python-like interface

    constructor.__name__ = name;

    constructor.__bases__ = baseclasses;

    constructor.__dict__ = {};

    constructor.prototype.__class__ = constructor;

    // make bound / unbound methods

    for (methname in basemeths) {

        attachMethodToClass(constructor, methname, basemeths[methname]);

    }

    return constructor;

}