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 (result => {
    return result.text ();
  });
};

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);
      } else {
        parsedResponse = JSON.parse (body);
        if (parsedResponse.refresh_token) {
          databaseHelper
            .updateTokens (
              parsedResponse.refresh_token,
              parsedResponse.access_token,
              parsedResponse.expires_in
            )
            .then (() => {
              resolve ();
            })
            .catch (e => {
              reject (e);
            });
        } else {
          reject (body);
        }
      }
    });
  });
};

var generateInteractionModel = function (skill) {
  let result = {};
  let allIntents = [];

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

  //Built-In like intents (Amazon built-in don't work, probably something related to existance of dialog intent
  
  allIntents.push ({
    name: 'HelpIntent',
    samples: ['Help', 'Can you help me', 'I need help'],
    slots: [],
  },
  {
    name: 'CancelIntent',
    samples: ['Cancel', 'Stop', 'Please stop'],
    slots: [],
  },
  {
    name: 'YesIntent',
    samples: [
      'Yes',
      'Yes please',
      'I would like that',
      'Yes I would like that',
    ],
    slots: [],
  },
  {
    name: 'NoIntent',
    samples: ['No', 'No thank you'],
    slots: [],
  });

  //Special intent for sending message (Dialog)

  allIntents.push ({
    name: 'SendMessageIntent',
    samples: [
      'I would like to send a message',
      'I want to send a message',
      'Send message',
    ],
    slots: [
      {
        name: 'Name',
        type: 'AMAZON.US_FIRST_NAME',
        samples: ['My name is {Name}', 'I am {Name}', '{Name}'],
      },
      {
        name: 'Email',
        type: 'EmailSlot',
        samples: ['My email is {Email}', '{Email}'],
      },
      {
        name: 'Message',
        type: 'MessageSlot',
        samples: ['{Message}'],
      },
    ],
  });

  let customSlotTypes = [
    {
      name: 'EmailSlot',
      values: [
        {
          id: null,
          name: {
            value: 'bla@bla.bla',
            synonyms: [],
          },
        },
        {
          id: null,
          name: {
            value: 'bla.bla@bla.bla.bla',
            synonyms: [],
          },
        },
        {
          id: null,
          name: {
            value: 'bla_bla@bla.bla',
            synonyms: [],
          },
        },
      ],
    },
    {
      name: 'MessageSlot',
      values: [
        {
          id: null,
          name: {
            value: 'Quick brown fox jumps over lazy dog',
            synonyms: [],
          },
        },
        {
          id: null,
          name: {
            value: 'Quick brown fox jumps over lazy dog. Quick brown fox jumps over lazy dog.',
            synonyms: [],
          },
        },
        {
          id: null,
          name: {
            value: 'Quick brown fox jumps over lazy dog. Quick brown fox jumps over lazy dog. Quick brown fox jumps over lazy dog.',
            synonyms: [],
          },
        },
      ],
    },
  ];

  let dialogPrompts = [
    {
      id: 'Elicit.Intent-SendMessageIntent.IntentSlot-Name',
      variations: [
        {
          type: 'PlainText',
          value: 'What is your name ?',
        },
        {
          type: 'PlainText',
          value: 'Tell me your name',
        },
      ],
    },
    {
      id: 'Elicit.Intent-SendMessageIntent.IntentSlot-Email',
      variations: [
        {
          type: 'PlainText',
          value: 'What is your email ?',
        },
        {
          type: 'PlainText',
          value: 'Tell me your email',
        },
      ],
    },
    {
      id: 'Elicit.Intent-SendMessageIntent.IntentSlot-Message',
      variations: [
        {
          type: 'PlainText',
          value: 'What is your message',
        },
      ],
    },
  ];

  let dialogIntents = [
    {
      name: 'SendMessageIntent',
      confirmationRequired: false,
      prompts: {},
      slots: [
        {
          name: 'Name',
          type: 'AMAZON.US_FIRST_NAME',
          elicitationRequired: true,
          confirmationRequired: false,
          prompts: {
            elicitation: 'Elicit.Intent-SendMessageIntent.IntentSlot-Name',
          },
        },
        {
          name: 'Email',
          type: 'EmailSlot',
          elicitationRequired: true,
          confirmationRequired: false,
          prompts: {
            elicitation: 'Elicit.Intent-SendMessageIntent.IntentSlot-Email',
          },
        },
        {
          name: 'Message',
          type: 'MessageSlot',
          elicitationRequired: true,
          confirmationRequired: false,
          prompts: {
            elicitation: 'Elicit.Intent-SendMessageIntent.IntentSlot-Message',
          },
        },
      ],
    },
  ];

  result.interactionModel = {};

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

  result.interactionModel.prompts = dialogPrompts;
  result.interactionModel.dialog = {};
  result.interactionModel.dialog.intents = dialogIntents;

  return JSON.stringify (result);
};

var uploadSkill = function (skill) {
  let generatedInteractionModel = generateInteractionModel (skill);
  console.log(skill.skillID);
  return fetch (
    `https://api.amazonalexa.com/v1/skills/${skill.skillID}/stages/development/interactionModel/locales/en-US`,
    {
      method: 'PUT',
      headers: {
        Authorization: config.TOKEN,
      },
      body: generatedInteractionModel,
    }
  );
};

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);
          });
      }
    });
  },
};