Base Code for Alan News Reader App

// Use this sample to create your own voice commands
intent('What does this app do?','What can I do here', 
       reply('This is a news project.'));

const NEWS_API_KEY = [YOUR_API_KEY];
let saved_articles = [];

/* NEWS by SOURCE*/
intent('Give me the news from $(source* (.*))', (p) => {
    let NEWS_API_URL= `http://newsapi.org/v2/top-headlines?apiKey=${NEWS_API_KEY}`;
    if(p.source.value){
        NEWS_API_URL = `${NEWS_API_URL}&sources=${p.source.value.toLowerCase().split(' ').join('-')}`;
    }
   api.request(NEWS_API_URL, (error, response, body) =>{
       const {articles} = JSON.parse(body);
       
       if(!articles.length){
           p.play('Sorry, please try searching from different source.');
           return;
       }
       
       saved_articles = articles;
       
      
       p.play({command: 'newHeadlines', articles});
       p.play(`Here are the (latest|recent) news from ${p.source.value}.`);
       
       
       p.play('Would you like me to read the headlines?');
       p.then(confirmation);

   }); 
});

/* NEWS by TERM*/
intent('What\'\s up with $(term* (.*))', (p) => {
   let NEWS_API_URL= `http://newsapi.org/v2/everything?apiKey=${NEWS_API_KEY}`;
   if(p.term.value){
        NEWS_API_URL = `${NEWS_API_URL}&q=${p.term.value}`;
    }
   api.request(NEWS_API_URL, (error, response, body) =>{
       const {articles} = JSON.parse(body);
       
       if(!articles.length){
           p.play('Sorry, please try searching from something else.');
           return;
       }
       
       saved_articles = articles;
       
      
       p.play({command: 'newHeadlines', articles});
       p.play(`Here are the (latest|recent) articles on ${p.term.value}.`);
       
       
       p.play('Would you like me to read the headlines?');
       p.then(confirmation);

   }); 
});

/* NEWS by CATEGORIES*/
const CATEGORIES = ['business', 'entertainment', 'general', 'health', 'science', 'sports', 'technology'];
const CATEGORIES_INTENT = `${CATEGORIES.map((category) => `${category}~${category}`).join('|')}|`;

intent(`(show|what is|tell me|what's|what are|what're|read) (the|) (recent|latest|) $(N news|headlines) (in|about|on|) $(C~ ${CATEGORIES_INTENT})`, 
       `(read|show|get|bring me|give me) (the|) (recent|latest) $(C~ ${CATEGORIES_INTENT}) $(N news|headlines)`,
       (p) => {

   let NEWS_API_URL= `http://newsapi.org/v2/top-headlines?apiKey=${NEWS_API_KEY}&country=us`;
   if(p.C.value){
        NEWS_API_URL = `${NEWS_API_URL}&category=${p.C.value}`;
    }
   api.request(NEWS_API_URL, (error, response, body) =>{
       const {articles} = JSON.parse(body);
       
       if(!articles.length){
           p.play('Sorry, please try searching from the existing categories.');
           return;
       }
       
       saved_articles = articles;
       
      
       p.play({command: 'newHeadlines', articles});
       if(p.C.value){
           p.play(`Here are the (latest|recent) articles for ${p.C.value}.`);
       }
       else{
           p.play(`Here are the (latest|recent) news.`);
       }
       p.play('Would you like me to read the headlines?');
       p.then(confirmation);

   }); 
});

/* CUSTOM DIALOGUE*/
const confirmation = context(() => {
    intent('yes', async (p)=>{
        for(let i=0;i<saved_articles.length;i++){
          p.play({command: 'highlight', article:saved_articles[i]});
          p.play(`${saved_articles[i].title}`);
        }
    });
    
    intent('no', (p)=>{
        p.play('Sounds good to me.');
    });
}) 
 

/* Read NUMBERED Article*/
intent('open (the|) (article|) (number|) $(number* (.*))', (p) => {
    if(p.number.value){
        p.play({command: 'open', number:p.number.value, articles: saved_articles})
    }
});

/* Go Back */
intent('(go|) back', (p) => {
   p.play('Sure, going back.');
   p.play({command:'newHeadlines', articles:[]});
});