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"use strict";
 
var extend = require("./util/core/extend");
var functionName = require("./util/core/function-name");
var valueToString = require("./util/core/value-to-string");
 
var slice = Array.prototype.slice;
var join = Array.prototype.join;
var useLeftMostCallback = -1;
var useRightMostCallback = -2;
 
var nextTick = (function () {
    Eif (typeof process === "object" && typeof process.nextTick === "function") {
        return process.nextTick;
    }
 
    if (typeof setImmediate === "function") {
        return setImmediate;
    }
 
    return function (callback) {
        setTimeout(callback, 0);
    };
})();
 
function getCallback(behavior, args) {
    var callArgAt = behavior.callArgAt;
 
    if (callArgAt >= 0) {
        return args[callArgAt];
    }
 
    var argumentList;
 
    if (callArgAt === useLeftMostCallback) {
        argumentList = args;
    }
 
    if (callArgAt === useRightMostCallback) {
        argumentList = slice.call(args).reverse();
    }
 
    var callArgProp = behavior.callArgProp;
 
    for (var i = 0, l = argumentList.length; i < l; ++i) {
        if (!callArgProp && typeof argumentList[i] === "function") {
            return argumentList[i];
        }
 
        if (callArgProp && argumentList[i] &&
            typeof argumentList[i][callArgProp] === "function") {
            return argumentList[i][callArgProp];
        }
    }
 
    return null;
}
 
function getCallbackError(behavior, func, args) {
    if (behavior.callArgAt < 0) {
        var msg;
 
        if (behavior.callArgProp) {
            msg = functionName(behavior.stub) +
                " expected to yield to '" + valueToString(behavior.callArgProp) +
                "', but no object with such a property was passed.";
        } else {
            msg = functionName(behavior.stub) +
                " expected to yield, but no callback was passed.";
        }
 
        if (args.length > 0) {
            msg += " Received [" + join.call(args, ", ") + "]";
        }
 
        return msg;
    }
 
    return "argument at index " + behavior.callArgAt + " is not a function: " + func;
}
 
function callCallback(behavior, args) {
    if (typeof behavior.callArgAt === "number") {
        var func = getCallback(behavior, args);
 
        if (typeof func !== "function") {
            throw new TypeError(getCallbackError(behavior, func, args));
        }
 
        if (behavior.callbackAsync) {
            nextTick(function () {
                func.apply(behavior.callbackContext, behavior.callbackArguments);
            });
        } else {
            func.apply(behavior.callbackContext, behavior.callbackArguments);
        }
    }
}
 
var proto = {
    create: function create(stub) {
        var behavior = extend({}, proto);
        delete behavior.create;
        delete behavior.addBehavior;
        delete behavior.createBehavior;
        behavior.stub = stub;
 
        return behavior;
    },
 
    isPresent: function isPresent() {
        return (typeof this.callArgAt === "number" ||
                this.exception ||
                typeof this.returnArgAt === "number" ||
                this.returnThis ||
                this.fakeFn ||
                this.returnValueDefined);
    },
 
    invoke: function invoke(context, args) {
        callCallback(this, args);
 
        if (this.exception) {
            throw this.exception;
        } else if (typeof this.returnArgAt === "number") {
            return args[this.returnArgAt];
        } else if (this.returnThis) {
            return context;
        } else if (this.fakeFn) {
            return this.fakeFn.apply(context, args);
        } else if (this.resolve) {
            return Promise.resolve(this.returnValue);
        } else if (this.reject) {
            return Promise.reject(this.returnValue);
        } else if (this.callsThrough) {
            return this.stub.wrappedMethod.apply(context, args);
        }
        return this.returnValue;
    },
 
    onCall: function onCall(index) {
        return this.stub.onCall(index);
    },
 
    onFirstCall: function onFirstCall() {
        return this.stub.onFirstCall();
    },
 
    onSecondCall: function onSecondCall() {
        return this.stub.onSecondCall();
    },
 
    onThirdCall: function onThirdCall() {
        return this.stub.onThirdCall();
    },
 
    withArgs: function withArgs(/* arguments */) {
        throw new Error(
            "Defining a stub by invoking \"stub.onCall(...).withArgs(...)\" " +
            "is not supported. Use \"stub.withArgs(...).onCall(...)\" " +
            "to define sequential behavior for calls with certain arguments."
        );
    }
};
 
function createAsyncVersion(syncFnName) {
    return function () {
        var result = this[syncFnName].apply(this, arguments);
        this.callbackAsync = true;
        return result;
    };
}
 
// create asynchronous versions of callsArg* and yields* methods
Object.keys(proto).forEach(function (method) {
    // need to avoid creating anotherasync versions of the newly added async methods
    Iif (method.match(/^(callsArg|yields)/) && !method.match(/Async/)) {
        proto[method + "Async"] = createAsyncVersion(method);
    }
});
 
function createBehavior(behaviorMethod) {
    return function () {
        this.defaultBehavior = this.defaultBehavior || proto.create(this);
        this.defaultBehavior[behaviorMethod].apply(this.defaultBehavior, arguments);
        return this;
    };
}
 
function addBehavior(stub, name, fn) {
    proto[name] = function () {
        fn.apply(this, [this].concat([].slice.call(arguments)));
        return this.stub || this;
    };
 
    stub[name] = createBehavior(name);
}
 
proto.addBehavior = addBehavior;
proto.createBehavior = createBehavior;
module.exports = proto;