require ('isomorphic-fetch');
const config = require ('../config/config');
var request = require ('request');
var databaseHelper = require ('./database');

var getBuildStatus = function (skillID) {
  fetch (
      `https://api.amazonalexa.com/v0/skills/${skillID}/interactionModel/locales/en-US/status`,
      {
        method: 'GET',
        headers: {
          Authorization: config.TOKEN,
        },
      }
    )
      .then (l => l.text ())
      .then (result => {
        return result;
      });
};

var refreshTokens = function () {
  return new Promise ((resolve, reject) => {
    var options = {
      method: 'POST',
      url: 'https://api.amazon.com/auth/o2/token',
      headers: {
        'cache-control': 'no-cache',
        'content-type': 'application/x-www-form-urlencoded',
      },
      form: {
        grant_type: 'refresh_token',
        refresh_token: config.REFRESH_TOKEN,
        client_id: config.CLIENT_ID,
        client_secret: config.CLIENT_SECRET,
      },
    };

    request (options, function (error, response, body) {
      if (error) reject (error);
      parsedResponse = JSON.parse (body);
      if (parsedResponse.refresh_token)
        return databaseHelper.updateTokens (
          parsedResponse.refresh_token,
          parsedResponse.access_token,
          parsedResponse.expires_in
        );
      console.log('Token refresh failed');
      console.log(body);
      reject(body);
    });
  });
};

var generateInteractionModel = function (skill) {
  let result = {};
  let allIntents = [];
  let defaultIntents = [
    {
      name: 'AMAZON.CancelIntent',
      samples: [],
    },
    {
      name: 'AMAZON.HelpIntent',
      samples: [],
    },
    {
      name: 'AMAZON.StopIntent',
      samples: [],
    },
  ];

  /*
    defaultIntents.map(intent=>{
        allIntents.push(intent);
    });
    */

  skill.intents.map (intent => {
    allIntents.push ({name: intent.intentName, samples: intent.questions});
  });


  //Special Email Intents :
  allIntents.push({
    name: 'EmailIntentLaunch',
    slots:[],
    samples: [
      'I want to send a message',
      'I would like to send a message',
      'I would like to leave a message',
      'Leave a message'
    ]
  });

  allIntents.push({
    name: 'EmailIntent',
    slots:[
      {
        'name': 'Name',
        'type': 'AMAZON.US_FIRST_NAME'
      },
      {
        'name': 'Email',
        'type': 'AMAZON.LITERAL'
      },
      {
        'name': 'Message',
        'type': 'AMAZON.LITERAL'
      },
      {
        'name': 'Data',
        'type': 'AMAZON.LITERAL'
      }
    ],
    
    
    samples: [
      'My name is {Name}',
      'I am {Name}',
      '{exampleww at wwdwdw|Data}',
      'My email is {example at efefegedd|Email}',
      'Send replay to {example at abcdefg|Email}',
      'My message is {The quick brown fox jumps over the lazy dog.The quick brown fox jumps over the lazy dog.The quick brown fox jumps over the lazy dog.|Message}'
    ]
    
  });
  
  result.interactionModel = {};

  result.interactionModel.languageModel = {
    invocationName: skill.invocationName,
    intents: allIntents,
  };

  return JSON.stringify (result);
};

var uploadSkill = function (skill) {
  return fetch (
    `https://api.amazonalexa.com/v0/skills/${skill.skillID}/interactionModel/locales/en-US`,
    {
      method: 'POST',
      headers: {
        Authorization: config.TOKEN,
      },
      body: generateInteractionModel (skill),
    }
  );
};

module.exports = {
  updateSkill: function (skill) {
    return new Promise ((resolve, reject) => {
      if (new Date () / 1000 > config.TOKEN_EXPIRES_IN) {
        refreshTokens ()
          .then (() => {
            uploadSkill (skill).then (response => {
              resolve (response.status);
            });
          })
          .catch (e => {
            reject (e);
          });
      } else {
        uploadSkill (skill)
          .then (response => {
            resolve (response.status);
          })
          .catch (e => {
            reject (e);
          });
      }
    });
  },
};