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

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

function sub (command, interpreter) {

    var sceneId, scene, doNext, next;

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

    next = {doNext: true};
    sceneId = command.getAttribute("scene") || null;
    doNext = command.getAttribute("next") === false ? false : true;

    if (sceneId === null) {
        warn(interpreter.bus, "Missing 'scene' attribute on 'sub' command!", command);
        return next;
    }

    sceneId = replaceVars(sceneId, interpreter);
    scene = interpreter.getSceneById(sceneId);

    if (!scene) {
        logError(interpreter.bus, "No such scene '" + sceneId + "'!", command);
        return next;
    }

    log(interpreter.bus, "Entering sub scene '" + sceneId + "'...");

    interpreter.pushToCallStack();

    interpreter.currentCommands = scene.childNodes;
    interpreter.index = -1;
    interpreter.sceneId = sceneId;
    interpreter.scenePath = [];
    interpreter.currentElement = -1;

    if (command.getAttribute("names")) {
        setVars(command, interpreter);
    }

    return {
        doNext: doNext
    };
}

module.exports = sub;