"use strict";
var global = require("./global.js");
var ASSERT = require("./assert.js");
var es5 = require("./es5.js");
var haveGetters = (function(){
    try {
        var o = {};
        es5.defineProperty(o, "f", {
            get: function () {
                return 3;
            }
        });
        return o.f === 3;
    }
    catch (e) {
        return false;
    }

})();

//If the property cannot be added on the object
//returns a shallow clone of the object with the property
//attached which is fine
var ensurePropertyExpansion = function(obj, prop, value) {
    try {
        notEnumerableProp(obj, prop, value);
        return obj;
    }
    catch (e) {
        var ret = {};
        var keys = es5.keys(obj);
        for (var i = 0, len = keys.length; i < len; ++i) {
            try {
                var key = keys[i];
                ret[key] = obj[key];
            }
            catch (err) {
                ret[key] = err;
            }
        }
        notEnumerableProp(ret, prop, value);
        return ret;
    }
};

var canEvaluate = (function() {
    //Cannot feature detect CSP without triggering
    //violations

    //So assume CSP if environment is browser. This is reasonable
    //because promise throughput doesn't matter in browser and
    //promisifcation is mostly interesting to node.js anyway
    if (typeof window !== "undefined" && window !== null &&
        typeof window.document !== "undefined" &&
        typeof navigator !== "undefined" && navigator !== null &&
        typeof navigator.appName === "string" &&
        window === global) {
        return false;
    }
    return true;
})();

function deprecated(msg) {
    if (typeof console !== "undefined" && console !== null &&
        typeof console.warn === "function") {
        console.warn("Bluebird: " + msg);
    }
}

var errorObj = {e: {}};
//Try catch is not supported in optimizing
//compiler, so it is isolated
function tryCatch1(fn, receiver, arg) {
    ASSERT(typeof fn === "function");
    try {
        return fn.call(receiver, arg);
    }
    catch (e) {
        errorObj.e = e;
        return errorObj;
    }
}

function tryCatch2(fn, receiver, arg, arg2) {
    ASSERT(typeof fn === "function");
    try {
        return fn.call(receiver, arg, arg2);
    }
    catch (e) {
        errorObj.e = e;
        return errorObj;
    }
}

function tryCatchApply(fn, args, receiver) {
    ASSERT(typeof fn === "function");
    try {
        return fn.apply(receiver, args);
    }
    catch (e) {
        errorObj.e = e;
        return errorObj;
    }
}

//Un-magical enough that using this doesn't prevent
//extending classes from outside using any convention
var inherits = function(Child, Parent) {
    var hasProp = {}.hasOwnProperty;

    function T() {
        this.constructor = Child;
        this.constructor$ = Parent;
        for (var propertyName in Parent.prototype) {
            if (hasProp.call(Parent.prototype, propertyName) &&
                propertyName.charAt(propertyName.length-1) !== "$"
           ) {
                this[propertyName + "$"] = Parent.prototype[propertyName];
            }
        }
    }
    T.prototype = Parent.prototype;
    Child.prototype = new T();
    return Child.prototype;
};

function asString(val) {
    return typeof val === "string" ? val : ("" + val);
}

function isPrimitive(val) {
    return val == null || val === true || val === false ||
        typeof val === "string" || typeof val === "number";

}

function isObject(value) {
    return !isPrimitive(value);
}

function maybeWrapAsError(maybeError) {
    if (!isPrimitive(maybeError)) return maybeError;

    return new Error(asString(maybeError));
}

function withAppended(target, appendee) {
    var len = target.length;
    var ret = new Array(len + 1);
    var i;
    for (i = 0; i < len; ++i) {
        ret[i] = target[i];
    }
    ret[i] = appendee;
    return ret;
}


function notEnumerableProp(obj, name, value) {
    var descriptor = {
        value: value,
        configurable: true,
        enumerable: false,
        writable: true
    };
    es5.defineProperty(obj, name, descriptor);
    return obj;
}


var wrapsPrimitiveReceiver = (function() {
    return this !== "string";
}).call("string");

function thrower(r) {
    throw r;
}


var ret = {
    thrower: thrower,
    isArray: es5.isArray,
    haveGetters: haveGetters,
    notEnumerableProp: notEnumerableProp,
    isPrimitive: isPrimitive,
    isObject: isObject,
    ensurePropertyExpansion: ensurePropertyExpansion,
    canEvaluate: canEvaluate,
    deprecated: deprecated,
    errorObj: errorObj,
    tryCatch1: tryCatch1,
    tryCatch2: tryCatch2,
    tryCatchApply: tryCatchApply,
    inherits: inherits,
    withAppended: withAppended,
    asString: asString,
    maybeWrapAsError: maybeWrapAsError,
    wrapsPrimitiveReceiver: wrapsPrimitiveReceiver
};

module.exports = ret;
