'use strict';

Ox.polyfill = {};

(function() {
    var digits = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
    /*@
    Ox.polyfill.atob <f> see https://developer.mozilla.org/en/DOM/window.atob
        > Ox.polyfill.atob('Cg==')
        '\n'
        > Ox.polyfill.atob('Zm9v')
        'foo'
    @*/
    Ox.polyfill.atob = function(string) {
        var binary = '', ret = '';
        String(string).replace(/=/g, '').split('').forEach(function(char) {
            binary += Ox.pad(digits.indexOf(char).toString(2), 'left', 6, '0');
        });
        while (binary.length >= 8) {
            ret += Ox.char(parseInt(binary.slice(0, 8), 2));
            binary = binary.slice(8);
        }
        return ret;
    };
    /*@
    Ox.polyfill.btoa <f> see https://developer.mozilla.org/en/DOM/window.btoa
        > Ox.polyfill.btoa('\n')
        'Cg=='
        > Ox.polyfill.btoa('foo')
        'Zm9v'
    @*/
    Ox.polyfill.btoa = function(string) {
        var binary = '', ret = '';
        String(string).split('').forEach(function(char) {
            binary += Ox.pad(char.charCodeAt(0).toString(2), 'left', 8, '0');
        });
        binary = Ox.pad(binary, Math.ceil(binary.length / 6) * 6, '0')
        while (binary) {
            ret += digits[parseInt(binary.slice(0, 6), 2)];
            binary = binary.slice(6);
        }
        return Ox.pad(ret, Math.ceil(ret.length / 4) * 4, '=');
    };
}());

(function(window) {
    /*@
    Ox.polyfill.bind <f> see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/bind
        <script>
            Ox.test.object = {
                get: function() {
                    return this.value;
                },
                value: 'foo'
            };
            Ox.test.get = Ox.test.object.get;
            Ox.test.value = 'bar';
        </script>
        > Ox.test.object.get()
        'foo'
        > Ox.test.get()
        'bar'
        > Ox.polyfill.bind.call(Ox.test.get, Ox.test.object)()
        'foo'
    @*/
    Ox.polyfill.bind = function(that) {
        if (typeof this !== 'function') {
            throw new TypeError();
        }
        var args = Array.prototype.slice.call(arguments, 1),
            fn = function() {},
            this_ = this,
            ret = function() {
                return this_.apply(
                    this instanceof fn ? this : that || window,
                    args.concat(Array.prototype.slice.call(arguments))
                );
            };
        fn.prototype = this.prototype;  
        ret.prototype = new fn();
        return ret;
    };
})(this);

/*@
Ox.polyfill.every <f> see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/every
    > Ox.polyfill.every.call([0, 1, 2], function(v, i) { return v == i; })
    true
    > Ox.polyfill.every.call([true, true, false], Ox.identity)
    false
@*/
Ox.polyfill.every = function(iterator, that) {
    if (this === void 0 || this === null || typeof iterator !== 'function') {
        throw new TypeError();  
    }
    var array = Object(this), i, length = array.length >>> 0, ret = true;
    for (i = 0; i < length; i++) {  
        if (i in array && !iterator.call(that, array[i], i, array)) {
            ret = false;
            break;  
        }
    }
    return ret;
};

/*@
Ox.polyfill.filter <f> see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/filter
    > Ox.polyfill.filter.call([2, 1, 0], function(v, i) { return v == i; })
    [1]
@*/
Ox.polyfill.filter = function(iterator, that) {  
    if (this === void 0 || this === null || typeof iterator !== 'function') {
        throw new TypeError();  
    }
    var array = Object(this), i, length = array.length >>> 0, ret = [], value;
    for (i = 0; i < length; i++) {  
        // save value in case iterator mutates it
        if (i in array && iterator.call(that, value = array[i], i, array)) {
            ret.push(value);
        }  
    }
    return ret;  
};

/*@
Ox.polyfill.forEach <f> see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/forEach
    <script>
        Ox.test.array = [];
        Ox.polyfill.forEach.call([1, 2, 3], function(v, i) { Ox.test.array.push([v, i])})
    </script>
    > Ox.test.array
    [[1, 0], [2, 1], [3, 2]]
@*/
Ox.polyfill.forEach = function(iterator, that) {
    if (this === void 0 || this === null || typeof iterator !== 'function') {
        throw new TypeError();  
    }
    var array = Object(this), i, length = array.length >>> 0;
    for (i = 0; i < length; i++) {  
        if (i in array) {
            iterator.call(that, array[i], i, array);
        }
    }
};

/*@
Ox.polyfill.indexOf <f> see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/indexOf
    > Ox.polyfill.indexOf.call([1, 2, 3, 2, 1], 2)
    1
    > Ox.polyfill.indexOf.call([1, 2, 3, 2, 1], 4)
    -1
@*/
Ox.polyfill.indexOf = function(value) {  
    if (this === void 0 || this === null) {  
        throw new TypeError();  
    }  
    var array = Object(this), i, length = array.length >>> 0, ret = -1;
    for (i = 0; i < length; i++) {
        if (i in array && array[i] === value) {
            ret = i;
            break;
        }
    }
    return ret;
};

/*@
Ox.polyfill.isArray <f> see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/isArray
    > Ox.polyfill.isArray([])
    true
    > Ox.polyfill.isArray((function() { return arguments; }()))
    false
    > Ox.polyfill.isArray({0: 0, length: 1})
    false
@*/
Ox.polyfill.isArray = function(value) {
    return Object.prototype.toString.call(value) == '[object Array]';
};

/*@
Ox.polyfill.JSON <o> see https://github.com/douglascrockford/JSON-js
    > Ox.polyfill.JSON.parse('{"a": [1, 2], "b": [3, 4]}')
    {a: [1, 2], b: [3, 4]}
    > Ox.polyfill.JSON.stringify([(function(){ return arguments; }()), false, null, 0, -0, Infinity, NaN, / /, void 0])
    '[{},false,null,0,0,null,null,{},null]'
    > Ox.polyfill.JSON.stringify(new Date()).length
    24
@*/
Ox.polyfill.JSON = (function() {
    var replace = {
        '"': '\\"',
        '\b': '\\b',
        '\f': '\\f',
        '\n': '\\n',
        '\r': '\\r',
        '\t': '\\t',
        '\\': '\\\\'
    };
    function quote(value) {
        return '"' + value.split('').map(function(char) {
            return replace[char] || char;
        }).join('') + '"';
    };
    return {
        parse: function parse(string) {
            return eval('(' + string + ')');
        },
        stringify: function stringify(value) {
            var ret = 'null', type = Ox.typeOf(value);
            if (type == 'arguments' || type == 'regexp') {
                ret = '{}';
            } else if (type == 'array') {
                ret = ['[', ']'].join(
                    value.map(function(v) {
                        return stringify(v);
                    }).join(',')
                );
            } else if (type == 'boolean') {
                ret = String(value);
            } else if (type == 'date') {
                ret = Ox.splice(
                    Ox.getISODate(value, true), 19, 0,
                    '.' + String(+value).slice(-3)
                );
            } else if (type == 'number') {
                ret = isFinite(value) ? String(value) : 'null';
            } else if (type == 'object') {
                ret = ['{', '}'].join(
                    Object.keys(value).map(function(k) {
                        return quote(k) + ': ' + stringify(value[k]);
                    }).join(',')
                );
            } else if (type == 'string') {
                ret = quote(value);
            }
            return ret;
        }
    };
}());

/*@
Ox.polyfill.keys <f> see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/keys
    > Ox.polyfill.keys({a: 1, b: 2, c: 3})
    ['a', 'b', 'c']
@*/
Ox.polyfill.keys = function(object) {  
    if (object !== Object(object)) {
        throw new TypeError();  
    }
    var key, ret = [];  
    for (key in object) {
        Object.prototype.hasOwnProperty.call(object, key) && ret.push(key);
    }
    return ret;
};

/*@
Ox.polyfill.lastIndexOf <f> see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/lastIndexOf
    > Ox.polyfill.lastIndexOf.call([1, 2, 3, 2, 1], 2)
    3
    > Ox.polyfill.lastIndexOf.call([1, 2, 3, 2, 1], 4)
    -1
@*/
Ox.polyfill.lastIndexOf = function(value) {  
    if (this === void 0 || this === null) {  
        throw new TypeError();  
    }  
    var array = Object(this), i, length = array.length >>> 0, ret = -1;
    for (i = length - 1; i >= 0; i--) {
        if (i in array && array[i] === value) {
            ret = i;
            break;
        }
    }
    return ret;
};

/*@
Ox.polyfill.localStorage <o> Empty object, to be used instead of localStorage
*/
Ox.polyfill.localStorage = {};

/*@
Ox.polyfill.map <f> see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/map
    > Ox.polyfill.map.call([2, 1, 0], function(v, i) { return v == i; })
    [false, true, false]
@*/
Ox.polyfill.map = function(iterator, that) {
    if (this === void 0 || this === null || typeof iterator !== 'function') {
        throw new TypeError();
    }
    var array = Object(this), i, length = array.length >>> 0,
        ret = new Array(length);
    for (i = 0; i < length; i++) {
        if (i in array) {
            ret[i] = iterator.call(that, array[i], i, array);
        }
    }
    return ret;
};

/*@
Ox.polyfill.reduce <f> see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/reduce
    > Ox.polyfill.reduce.call([1, 2, 3], function(p, c, i) { return p + c + i; }, 1)
    10
@*/
Ox.polyfill.reduce = function(iterator, ret) {
    if (this === void 0 || this === null || typeof iterator !== 'function') {
        throw new TypeError();
    }
    var array = Object(this), i, length = array.length;
    if (!length && ret === void 0) {
        throw new TypeError();
    }
    if (ret === void 0) {
        ret = array[0];
        i = 1;
    }
    for (i = i || 0; i < length; i++) {
        if (i in array) {
            ret = iterator.call(void 0, ret, array[i], i, array);
        }
    }
    return ret;
};

/*@
Ox.polyfill.reduceRight <f> see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/reduceRight
    > Ox.polyfill.reduceRight.call([1, 2, 3], function(p, c, i) { return p + c + i; }, 1)
    10
@*/
Ox.polyfill.reduceRight = function(iterator, ret) {
    if (this === void 0 || this === null || typeof iterator !== 'function') {
        throw new TypeError();
    }
    var array = Object(this), i, length = array.length;
    if (!length && ret === void 0) {
        throw new TypeError();
    }
    if (ret === void 0) {
        ret = array[length - 1];
        i = length - 2;
    }
    for (i = i || length - 1; i >= 0; i--) {
        if (i in array) {
            ret = iterator.call(void 0, ret, array[i], i, array);
        }
    }
    return ret;
};

/*@
Ox.polyfill.some <f> see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/some
    > Ox.polyfill.some.call([2, 1, 0], function(v, i) { return v == i; })
    true
    > Ox.polyfill.some.call([false, false, false], Ox.identity)
    false
@*/
Ox.polyfill.some = function(iterator, that) {
    if (this === void 0 || this === null || typeof iterator !== 'function') {
        throw new TypeError();  
    }
    var array = Object(this), i, length = array.length >>> 0, ret = false;
    for (i = 0; i < length; i++) {  
        if (i in array && iterator.call(that, array[i], i, array)) {
            ret = true;
            break;  
        }
    }
    return ret;
};

/*@
Ox.polyfill.trim <f> see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/Trim
    > Ox.polyfill.trim.call('  foo  ')
    'foo'
@*/
Ox.polyfill.trim = function() {
    return this.replace(/^\s+|\s+$/g, '');
};

(function(window) {
    var key, log, object;
    for (key in Ox.polyfill) {
        object = key == 'bind' ? Function.prototype
            : key == 'isArray' ? Array
            : key == 'atob' || key == 'btoa'
                || key == 'JSON' || key == 'localStorage' ? window
            : key == 'keys' ? Object
            : key == 'trim' ? String.prototype
            : Array.prototype;
        if (!object[key]) {
            object[key] = Ox.polyfill[key];
        }
    }
    // In IE8, window.console.log is an object,
    // in IE9, window.console.log.apply is undefined
    // see http://stackoverflow.com/questions/5472938/does-ie9-support-console-log-and-is-it-a-real-function
    if (window.console) {
        if (typeof window.console.log !== 'function') {
            log = window.console.log;
            window.console.log = function() {
                log(Array.prototype.slice.call(arguments).join(' '));
            };
        } else if (!window.console.log.apply) {
            window.console.log = Function.prototype.bind.call(
                window.console.log, window.console
            );
        }
    }
})(this);
