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

function trigger (command, interpreter) {

    var triggerName, action, next;

    next = {doNext: true};

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

    triggerName = command.getAttribute("name") || null;
    action = command.getAttribute("action") || null;

    if (triggerName === null) {
        warn(interpreter.bus, "No name specified on trigger command.", command);
        return next;
    }

    if (action === null) {
        warn(interpreter.bus, "No action specified on trigger command " +
            "referencing trigger '" + triggerName + "'.", command);
        return next;
    }

    if (
        typeof interpreter.triggers[triggerName] === "undefined" ||
        interpreter.triggers[triggerName] === null
    ) {
        warn(interpreter.bus, "Reference to unknown trigger '" + triggerName + "'.", command);
        return next;
    }

    if (typeof interpreter.triggers[triggerName][action] !== "function") {
        warn(interpreter.bus, "Unknown action '" + action +
            "' on trigger command referencing trigger '" + triggerName + "'.", command);
        return next;
    }

    interpreter.triggers[triggerName][action](command);

    return next;
}

module.exports = trigger;