/* eslint-disable promise/catch-or-return */
const {admin, db} = require('../util/admin');
const config = require('../util/config');

const {validateUpdateProfileInfo} = require('../util/validator');

const firebase = require('firebase');
firebase.initializeApp(config);



exports.signup = (req, res) => {
    const newUser = {
        email: req.body.email,
        handle: req.body.handle,
        password: req.body.password,
        confirmPassword: req.body.confirmPassword,
        createdAt: new Date().toISOString()
    };

    // console.log(newUser);

    let errors = {};

    const emailRegEx = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|(".+"))@(([[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;

    //Email check
    if(newUser.email.trim() === '') {
        errors.email = 'Email must not be blank.';
    }
    else if(!newUser.email.match(emailRegEx)) {
        errors.email = 'Email is invalid.';
    }

    //handle check
    if(newUser.handle.trim() === '') {
        errors.handle = 'Username must not be blank.';
    }
    else if(newUser.handle.length < 4 || newUser.handle.length > 30) {
        errors.handle = 'Username must be between 4-30 characters long.';
    }

    //Password check
    if(newUser.password.trim() === '') {
        errors.password = 'Password must not be blank.';
    }
    else if(newUser.password.length < 8 || newUser.password.length > 20) {
        errors.password = 'Password must be between 8-20 characters long.';
    }

    //Confirm password check
    if(newUser.confirmPassword !== newUser.password) {
        errors.confirmPassword = 'Passwords must match.';
    }

    //Overall check
    if(Object.keys(errors).length > 0) {
        return res.status(400).json(errors);
    }
    
    let idToken, userId;

    db.doc(`/users/${newUser.handle}`).get()
    .then(doc => {
        if(doc.exists) {
            return res.status(400).json({ handle: 'This username is already taken.' });
        }
        return firebase.auth().createUserWithEmailAndPassword(newUser.email, newUser.password);
    })
    .then(data => {
        userId = data.user.uid;
        return data.user.getIdToken();
    })
    .then(token => {
        idToken = token;
        const userCred = {
            email: req.body.email,
            handle: newUser.handle,
            createdAt: newUser.createdAt,
            userId
        }
        return db.doc(`/users/${newUser.handle}`).set(userCred);
    })
    .then(() => {
        return res.status(201).json({ idToken });
    })
    .catch(err => {
        console.error(err);
        if(err.code === 'auth/email-already-in-use') {
            return res.status(500).json({ email: 'This email is already taken.' });
        }
        return res.status(500).json({ error: err.code });
    });
};

exports.login = (req, res) => {
        const user = {
            email: req.body.email,
            password: req.body.password
        }
    
        //Auth validation
        let errors = {};
    
        //Email check
        if(user.email.trim() === '') {
            errors.email = 'Email must not be blank.';
        }
    
        //Password check
        if(user.password.trim() === '') {
            errors.password = 'Password must not be blank.';
        }
    
        //Overall check
        if(Object.keys(errors).length > 0) {
            return res.status(400).json(errors);
        }
    
        firebase.auth().signInWithEmailAndPassword(user.email, user.password)
        .then(data => {
            return data.user.getIdToken();
        })
        .then(token => {
            return res.json({token});
        })
        .catch(err => {
            console.error(err);
            if(err.code === 'auth/wrong-password') {
                return res.status(403).json({ general: 'Invalid credentials. Please try again.' });
            }
            return res.status(500).json({ error: err.code });
        });
    };

exports.getProfileInfo = (req, res) => {
    // FIXME: Delete this after login is implemented
    req.user = {};
    req.user.handle = 'itsjimmy';

    db.collection('users').doc(req.user.handle).get()
        .then((data) => {
            return res.status(200).json(data.data());
        })
        .catch((err) => {
            console.error(err);
            return res.status(500).json(err);
        });
};

exports.updateProfileInfo = (req, res) => {
    // FIXME: Delete this after login is implemented
    req.user = {};
    req.user.handle = 'itsjimmy';

    // TODO: Add functionality for adding/updating profile images

    
    // Data validation
    const {valid, errors, profileData} = validateUpdateProfileInfo(req.body);
    if (!valid) return res.status(400).json(errors);
    

    // Update the database entry for this user
    db.collection('users').doc(req.user.handle).set(profileData, {merge: true})
        .then(() => {
            console.log(`${req.user.handle}'s profile info has been updated.`)
            return res.status(201).json({general: `${req.user.handle}'s profile info has been updated.`});
        })
        .catch((err) => {
            console.error(err);
            return res.status(500).json({
                error: 'Error updating profile data'
            });
        })
};

exports.getUserDetails = (req, res) => {
    let userData = {};
    db.doc(`/users/${req.params.handle}`).get().then((doc) => {
            if (doc.exists) {
                userData.user = doc.data();
                return db.collection('post').where('userHandle', '==', req.params.handle)
                    .orderBy('createdAt', 'desc').get();
            } else {
                return res.status(404).json({
                    error: 'User not found'
                });
            }
        })
        .then((data) => {
            userData.posts = [];
            data.forEach((doc) => {
                userData.posts.push({
                    body: doc.data().body,
                    createAt: doc.data().createAt,
                    userHandle: doc.data().userHandle,
                    userImage: doc.data().userImage,
                    likeCount: doc.data().likeCount,
                    commentCount: doc.data().commentCount,
                    postId: doc.id
                });
            });
            return res.json(userData);
        })
        .catch((err) => {
            console.error(err);
            return res.status(500).json({ error: err.code});
        });
};