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const functions = require('firebase-functions');
const admin = require('firebase-admin');
const Firestore = require('@google-cloud/firestore');
//const service_account = require(getKeyFileName());
const express = require('express');
const body_parser = require('body-parser');
const cors = require('cors');
const router = express.Router();


let app = express();
app.use(cors(origin: true));
app.use(body_parser.json());
app.use(body_parser.urlencoded( extended: true ));

app.use((req, res, next) => 
 res.header('Cache-Control', 'private, no-cache, no-store, must-revalidate');
 res.header('Expires', '-1');
 res.header('Pragma', 'no-cache');
 next();
);


const firestore = new Firestore(
 projectId: getProyectId(),
 keyFilename: getKeyFileName()
);
const collection_userRef = firestore.collection('users/');

let user_model = 
 userName: "",
 userId: "",
 userScore: 0,
 first_login: true,
 section: "",
 userEmail: ""
;
let user = null;

main();

// admin.initializeApp(
// credential: admin.credential.cert(service_account)
// );


function main() 
 admin.initializeApp(functions.config().firebase);


 userDao();


function userDao() 

 getUserByEmail();

 exports.getUserByEmail = functions.https.onRequest(app);

 postUser();

 exports.postUser = functions.https.onRequest(app);

 getUsers();

 exports.getUsers = functions.https.onRequest(app);

 deleteUser();

 exports.deleteUser = functions.https.onRequest(app);



function getUsers() 

 app.get('', (req, res) => 

 const users = ;

 return new Promise((resolve, reject) => 
 return collection_userRef.get().then(snapshot => 

 snapshot.forEach(doc => 
 console.log(doc.data());
 users.push(doc.data());
 );

 resolve(users);
 res.send(users);
 return users;
 ).catch(error => 
 console.log(error.message);
 reject(error);
 );
 );
 );



//using post to put user and to update it
function postUser() 

 app.post('/:user', (req, res) => 

 user = req.body;
 console.log(req.body);

 user['userScore'] = parseInt(user.userScore);
 //si el texto es true, entonces la comparacion da un true en boolean si no pues false
 user['first_login'] = (user.first_login === 'true');
 user['isSelected'] = (user.isSelected === 'true');


 return new Promise((resolve, reject) => 
 return collection_userRef.doc(user.userId).set(user).then(() => 

 console.log("USER ID: " + user.userId);

 res.send(user);
 resolve(user);
 return user;
 ).catch(error => 
 reject(error);
 );
 );

 );



function deleteUser() 
 app.delete('/:id', (req, res) => 

 let idToDelete = req.params.id;

 console.log("USER DELETED: " + idToDelete);

 let message = "message": "Usuario borrado!";

 return new Promise((resolve, reject) => 

 return collection_userRef.doc(idToDelete).delete().then(() => 

 console.log(message);

 resolve(message);
 res.send(message);
 return message;
 ).catch(error => 
 console.log(error);
 reject(error);
 res.send(error.toString());
 );

 // return collection_userRef.where("userEmail", "==", email).get().then(querySnapshot => 
 //
 // querySnapshot.forEach(doc => 
 //
 // console.log("doc info: " + doc.get("userId"));
 //
 // user = 
 // "userName": doc.get("userName"),
 // "userId": doc.get("userId"),
 // "userScore": doc.get("userScore"),
 // "first_login": doc.get("first_login"),
 // "section": doc.get("section"),
 // "userEmail": doc.get("userEmail")
 // ;
 //
 // doc.ref.delete();
 // );
 //
 //
 // resolve(message);
 // res.send(message);
 // return message;
 // ).catch(error => 
 // console.log(error.message);
 // reject(error);
 // );
 );
 );



function getUserByEmail() 

 app.get('/:email', (req, res) => 

 let user_email = req.params.email;

 console.log("USUARIO EMAIL: " + req.params.email);

 return new Promise((resolve, reject) => 
 return collection_userRef.where("userEmail", "==", user_email).get().then(snapshot => 


 snapshot.forEach(doc => 
 console.log("doc info: " + doc.get("userEmail"));
 user = 
 "userName": doc.get("userName"),
 "userId": doc.get("userId"),
 "userScore": doc.get("userScore"),
 "first_login": doc.get("first_login"),
 "section": doc.get("section"),
 "userEmail": doc.get("userEmail")
 ;
 );


 //console.log("USUARIO: " + user.userName);

 resolve(user);
 return res.send(user);
 ).catch(err => 
 reject(err);
 console.log(err.toString());
 );

 );
 );



function getKeyFileName() 
 return "./coprojedb_sdkfirebase_admin_key.json";


function getProyectId() 
 return "coprojedb";