// 1. Text strings =====================================================================================================
//    Modify these strings and messages to change the behavior of your Lambda function

var languageStrings = {
    'en': {
        'translation': {
            'WELCOME' : "Welcome to the Breakfast Sandwich Recipe skill. ",
            'TITLE'   : "Breakfast Sandwich",
            'HELP'    : "This skill will show you how to make a breakfast sandwich.  You can ask for the list of ingredients, or just say begin cooking if you are ready. Once you are cooking, just say Next to advance to the next step in the recipe. You can also pause the recipe at any time by saying Pause.",
            'STOP'    : "Okay, see you next time! "
        }
    }
    // , 'de-DE': { 'translation' : { 'WELCOME'   : "Guten Tag etc." } }
};
var data = {
  // TODO: Replace this data with your own.
    "ingredients" :
        [
            {"name": "bread",  "qty": 2, "units": "pieces of"},
            {"name": "egg",    "qty": 1, "units": ""  },
            {"name": "cheese", "qty": 1, "units": "slice of" }
        ],
    "steps" :
    [
        "Heat a frying pan on your stove over medium heat.",
        "Crack an egg in the skillet and heat until the egg becomes firm.",
        "Flip the egg with a spatula.",
        "Lay the cheese on top of the egg.",
        "Using a spatula, remove egg and cheese and place on one piece of bread.",
        "Place second piece of bread over the egg and cheese.",
        "Serve."
    ]
};

var welcomeCardImg = {
    smallImageUrl: 'https://s3.amazonaws.com/webappvui/img/breakfast_sandwich_small.png',
    largeImageUrl: 'https://s3.amazonaws.com/webappvui/img/breakfast_sandwich_large.png'
};
// 2. Skill Code =======================================================================================================

var Alexa = require('alexa-sdk');

var AWS = require('aws-sdk');  // this is defined to enable a DynamoDB connection from local testing
var AWSregion = 'us-east-1';   // eu-west-1
AWS.config.update({
    region: AWSregion
});

exports.handler = function(event, context, callback) {
    var alexa = Alexa.handler(event, context);

    // alexa.appId = 'amzn1.echo-sdk-ams.app.1234';
    // alexa.dynamoDBTableName = 'RecipeSkillTable'; // creates new table for session.attributes

    alexa.resources = languageStrings;
    alexa.registerHandlers(handlers);
    alexa.execute();

};

var handlers = {
    'LaunchRequest': function () {
        if (!this.attributes['currentStep'] ) {

            var say = this.t('WELCOME') + ' ' + this.t('HELP');
            this.emit(':askWithCard', say, say, this.t('TITLE'), this.t('WELCOME'), welcomeCardImg);

        } else {

            var say = 'Welcome back.  You were on step '
                + this.attributes['currentStep']
                + '. Say restart if you want to start over. '
                + ' Ready to continue with step '
                + (parseInt(this.attributes['currentStep']) + 1 ).toString() + '?';
            this.emit(':askWithCard', say, say, 'Continue?', say);
        }

    },

    'IngredientsIntent': function () {

        var say = "";
        var list = [];
        for (var i = 0; i < data.ingredients.length; i++) {
            var item = data.ingredients[i];
            list.push(item.qty + ' ' + item.units + ' ' + item.name);
        }
        say += sayArray(list,'and');
        say = 'The ingredients you will need are, ' + say + '. Are you ready to cook? ';

        var cardlist = list.toString().replace(/\,/g, '\n');

        this.emit(':askWithCard', say, 'Say yes if you are ready to begin cooking the recipe.', this.t('TITLE') + ' shopping list', cardlist);

    },
    'CookIntent': function () {
        this.emit('AMAZON.NextIntent');
    },
    'AMAZON.YesIntent': function () {

        this.emit('AMAZON.NextIntent');

    },
    'AMAZON.NoIntent': function () {

        this.emit(':tell', 'Okay, see you next time!');
    },
    'AMAZON.PauseIntent': function () {
        this.emit(':tell', 'Okay, you can come back to this skill to pick up where you left off.');
    },

    'AMAZON.NextIntent': function () {
        if (!this.attributes['currentStep'] ) {
            this.attributes['currentStep'] = 1;
        } else {
            this.attributes['currentStep'] = this.attributes['currentStep'] + 1;
        }
        var currentStep = this.attributes['currentStep'];
        var say = 'Step ' + currentStep + ', ' + data.steps[currentStep - 1];
        var sayOnScreen = data.steps[currentStep - 1];

        if(currentStep == data.steps.length ) {

            delete this.attributes['currentStep'];
            this.emit(':tellWithCard', say + '. <say-as interpret-as="interjection">bon appetit</say-as>', this.t('TITLE'),  say + '\nBon Appetit!', welcomeCardImg);

        } else {

            this.emit(':askWithCard', say, 'You can say Pause, Stop, or Next.', 'Step ' + currentStep, sayOnScreen);
        }

    },

    'AMAZON.RepeatIntent': function () {
        if (!this.attributes['currentStep'] ) {
            this.attributes['currentStep'] = 1;
        } else {
            this.attributes['currentStep'] = this.attributes['currentStep'] - 1;
        }

        this.emit('AMAZON.NextIntent');

    },
    'AMAZON.HelpIntent': function () {

        if (!this.attributes['currentStep']) {  // new session
            this.emit(':ask', this.t('HELP'));
        } else {
            var currentStep = this.attributes['currentStep'];
            this.emit(':ask', 'you are on step ' + currentStep + ' of the ' + this.t('TITLE') + ' recipe. Say Next to continue or Ingredients to hear the list of ingredients.');
        }

    },
    'AMAZON.StartOverIntent': function () {
        delete this.attributes['currentStep'];
        this.emit('LaunchRequest');
    },
    'AMAZON.CancelIntent': function () {
        this.emit(':tell', this.t('STOP'));
    },
    'AMAZON.StopIntent': function () {
        this.emit(':tell', this.t('STOP'));
    },
    'SessionEndedRequest': function () {
        console.log('session ended!');
        this.emit(':saveState', true);
    }

};

//    END of Intent Handlers {} ========================================================================================
// 3. Helper Function  =================================================================================================

function sayArray(myData, andor) {
    //say items in an array with commas and conjunctions.
    // the first argument is an array [] of items
    // the second argument is the list penultimate word; and/or/nor etc.

    var listString = '';

    if (myData.length == 1) {
        //just say the one item
        listString = myData[0];
    } else {
        if (myData.length == 2) {
            //add the conjuction between the two words
            listString = myData[0] + ' ' + andor + ' ' + myData[1];
        } else if (myData.length == 4 && andor=='and'){
            //read the four words in pairs when the conjuction is and
            listString=myData[0]+" and "+myData[1]+", as well as, "
                + myData[2]+" and "+myData[3];

        }  else {
            //build an oxford comma separated list
            for (var i = 0; i < myData.length; i++) {
                if (i < myData.length - 2) {
                    listString = listString + myData[i] + ', ';
                } else if (i == myData.length - 2) {            //second to last
                    listString = listString + myData[i] + ', ' + andor + ' ';
                } else {                                        //last
                    listString = listString + myData[i];
                }
            }
        }
    }

    return(listString);
}

function randomArrayElement(array) {
    var i = 0;
    i = Math.floor(Math.random() * array.length);
    return(array[i]);
}