var Promise = require('promise');

function Scratch3OperatorsBlocks(runtime) {
    /**
     * The runtime instantiating this block package.
     * @type {Runtime}
     */
    this.runtime = runtime;
}

/**
 * Retrieve the block primitives implemented by this package.
 * @return {Object.<string, Function>} Mapping of opcode to Function.
 */
Scratch3OperatorsBlocks.prototype.getPrimitives = function() {
    return {
        'math_number': this.number,
        'text': this.text,
        'operator_add': this.add,
        'operator_subtract': this.subtract,
        'operator_multiply': this.multiply,
        'operator_divide': this.divide,
        'operator_lt': this.lt,
        'operator_equals': this.equals,
        'operator_gt': this.gt,
        'operator_and': this.and,
        'operator_or': this.or,
        'operator_not': this.not,
        'operator_random': this.random
    };
};

Scratch3OperatorsBlocks.prototype.number = function (args) {
    var num = Number(args.NUM);
    if (num !== num) {
        // NaN
        return 0;
    }
    return num;
};

Scratch3OperatorsBlocks.prototype.text = function (args) {
    return String(args.TEXT);
};

Scratch3OperatorsBlocks.prototype.add = function (args) {
    return args.NUM1 + args.NUM2;
};

Scratch3OperatorsBlocks.prototype.subtract = function (args) {
    return args.NUM1 - args.NUM2;
};

Scratch3OperatorsBlocks.prototype.multiply = function (args) {
    return args.NUM1 * args.NUM2;
};

Scratch3OperatorsBlocks.prototype.divide = function (args) {
    return args.NUM1 / args.NUM2;
};

Scratch3OperatorsBlocks.prototype.lt = function (args) {
    return Boolean(args.OPERAND1 < args.OPERAND2);
};

Scratch3OperatorsBlocks.prototype.equals = function (args) {
    return Boolean(args.OPERAND1 == args.OPERAND2);
};

Scratch3OperatorsBlocks.prototype.gt = function (args) {
    return Boolean(args.OPERAND1 > args.OPERAND2);
};

Scratch3OperatorsBlocks.prototype.and = function (args) {
    return Boolean(args.OPERAND1 && args.OPERAND2);
};

Scratch3OperatorsBlocks.prototype.or = function (args) {
    return Boolean(args.OPERAND1 || args.OPERAND2);
};

Scratch3OperatorsBlocks.prototype.not = function (args) {
    return Boolean(!args.OPERAND);
};

Scratch3OperatorsBlocks.prototype.random = function (args) {
    // As a demo, this implementation of random returns after 1 second of yield.
    // @todo Match Scratch 2.0 implementation with int-truncation.
    // See: http://bit.ly/1Qc0GzC
    var examplePromise = new Promise(function(resolve) {
        setTimeout(function() {
            var res = (Math.random() * (args.TO - args.FROM)) + args.FROM;
            resolve(res);
        }, 1000);
    });
    return examplePromise;
};

module.exports = Scratch3OperatorsBlocks;