var tools = require("../tools/tools");

var log = tools.log;
var warn = tools.warn;
var replaceVars = tools.replaceVariables;

function varCommand (command, interpreter) {

    var key, val, lval, action, container, next;

    next = {doNext: true};

    interpreter.bus.trigger(
        "wse.interpreter.commands.var",
        {
            interpreter: interpreter,
            command: command
        }, 
        false
    );

    key = command.getAttribute("name") || null;
    val = command.getAttribute("value") || "1";
    action = command.getAttribute("action") || "set";

    if (key === null) {
        warn(interpreter.bus, "Command 'var' must have a 'name' attribute.", command);
        return next;
    }

    container = interpreter.runVars;

    if (action !== "set" && !(key in container || command.getAttribute("lvalue"))) {
        warn(interpreter.bus, "Undefined variable.", command);
        return next;
    }

    val  = replaceVars(val,  interpreter);

    if (action === "set") {
        container[key] = "" + val;
        return next;
    }

    lval = command.getAttribute("lvalue") || container[key];
    lval = replaceVars(lval, interpreter);

    switch (action) {

        case "delete":
            delete container[key];
            break;

        case "increase":
            container[key] = "" + (parseFloat(lval) + parseFloat(val));
            break;
        case "decrease":
            container[key] = "" + (parseFloat(lval) - parseFloat(val));
            break;
        case "multiply":
            container[key] = "" + (parseFloat(lval) * parseFloat(val));
            break;
        case "divide":
            container[key] = "" + (parseFloat(lval) / parseFloat(val));
            break;
        case "modulus":
            container[key] = "" + (parseFloat(lval) % parseFloat(val));
            break;

        case "and":
            container[key] = "" + (parseFloat(lval) && parseFloat(val));
            break;
        case "or":
            container[key] = "" + (parseFloat(lval) || parseFloat(val));
            break;
        case "not":
            container[key] = parseFloat(lval) ? "0" : "1";
            break;

        case "is_greater":
            container[key] = parseFloat(lval) > parseFloat(val) ? "1" : "0";
            break;
        case "is_less":
            container[key] = parseFloat(lval) < parseFloat(val) ? "1" : "0";
            break;
        case "is_equal":
            container[key] = parseFloat(lval) === parseFloat(val) ? "1" : "0";
            break;
        case "not_greater":
            container[key] = parseFloat(lval) <= parseFloat(val) ? "1" : "0";
            break;
        case "not_less":
            container[key] = parseFloat(lval) >= parseFloat(val) ? "1" : "0";
            break;
        case "not_equal":
            container[key] = parseFloat(lval) !== parseFloat(val) ? "1" : "0";
            break;

        case "print":
            log(interpreter.bus, "Variable '" + key + "' is: " + container[key]);
            break;

        default:
            warn(interpreter.bus, "Unknown action '" + action +
                "' defined on 'var' command.", command);
    }

    return next;
}

module.exports = varCommand;