exports.handler = function (event, context) {
  try {
    console.log("event.session.application.applicationId=" + event.session.application.applicationId);

    if (event.session.application.applicationId !== "amzn1.echo-sdk-ams.app.b67c3ab5-40ec-4345-856e-21c281cfded7") {
      context.fail("Invalid Application ID");
    }

    if (event.request.type === "IntentRequest") {
        onIntent(event.request,
                 event.session,
                 function callback(sessionAttributes, speechletResponse) {
                     context.succeed(buildResponse(sessionAttributes, speechletResponse));
                 });
    } else if (event.request.type === "SessionEndedRequest") {
      context.succeed();
    }
  } catch (e) {
    context.fail("Exception"+ e.stack);
  }
};

/**
 * Called when the user specifies an intent for this skill.
 */
function onIntent(intentRequest, session, callback) {
    var intent = intentRequest.intent,
        intentName = intentRequest.intent.name;

    // Dispatch to your skill's intent handlers
    if ("IsItLitOrNahIntent" === intentName) {
        isItLitOrNah(intent, false, callback);
    } else if ("IsItLitOrNahPluralIntent" === intentName) {
        isItLitOrNah(intent, true, callback);
    } else if ("HelpIntent" === intentName) {
        help(callback);
    } else {
        throw "Invalid intent";
    }
}

// --------------- Functions that control the skill's behavior -----------------------

function isItLitOrNah(intent, isPlural, callback) {
    // If we wanted to initialize the session to have some attributes we could add those here.
    var sessionAttributes = {};
    var cardTitle = "Is It lit?";
    var random = Math.random()
    var article = isPlural ? "are" : "is"
    
    if (intent.slots.Thing.value === "it's" || intent.slots.Thing.value === "it") {
      var speechOutput = "Ayy, it is so fucking lit.";
    } else if (random < 0.5) {
      var speechOutput = "Ayy, " + intent.slots.Thing.value + " " + article + " fucking lit.";
    } else {
      var speechOutput = "Nah man. " + intent.slots.Thing.value + " " + article + " not lit.";
    }

    var shouldEndSession = true;

    callback(sessionAttributes,
             buildSpeechletResponse(cardTitle, speechOutput, shouldEndSession));
}

function help(callback) {
    // If we wanted to initialize the session to have some attributes we could add those here.
    var sessionAttributes = {};
    var cardTitle = "Help";
    var speechOutput = "I'll let you know if it's lit today. Ask is it lit.";

    var shouldEndSession = true;

    callback(sessionAttributes,
             buildSpeechletResponse(cardTitle, speechOutput, shouldEndSession));
}


// --------------- Helpers that build all of the responses -----------------------

function buildSpeechletResponse(title, output, shouldEndSession) {
    return {
        outputSpeech: {
            type: "PlainText",
            text: output
        },
        card: {
            type: "Simple",
            title: "SessionSpeechlet - " + title,
            content: "SessionSpeechlet - " + output
        },
        shouldEndSession: shouldEndSession
    }
}

function buildResponse(sessionAttributes, speechletResponse) {
    return {
        version: "1.0",
        sessionAttributes: sessionAttributes,
        response: speechletResponse
    }
}