var bcrypt = require('bcrypt');
var salt = bcrypt.genSaltSync(10);
var path = require('path');
const api_version = path.resolve(__dirname, '..').split(path.sep).pop();
const jwt = require('jsonwebtoken')
const { passwordEmail, register } = require('../utils/email')
const fs = require('fs');
var uuid = require('uuid');
const tokenSecret = fs.readFileSync(path.resolve(
    __dirname, '..', 'utils/files/secret-token.key')
    , { encoding: 'utf-8' });
class auth {

    constructor(connection) {
        this.connection = connection
    }

    async signin(application, req) {
        try {
            const base64Credentials = req.headers.authorization.split(' ')[1];
            const credentials = Buffer.from(base64Credentials, 'base64').toString('ascii');
            var credentialArray = credentials.split(':');
            var email = credentialArray[0];
            var pwd = credentialArray[1];

            var userModel = await new application.app[api_version].models.user(this.connection);
            var data = await userModel.getOne({ email: email })

            if (data != null) {
                if (bcrypt.compareSync(pwd, data.password)) {
                    return await this.generateToken(data);
                } else {
                    return { code: 401, error: 'Unauthorized access' }
                }
            } else {
                return { code: 401, error: 'Unauthorized access' }
            }
        } catch (error) {
            console.log("error model auth signin --> " + error);
            return { code: 500, error: 'Internal Server Error' }
        }
    }

    async signup(application, req) {
        try {
            var email = req.body.email;
            var pwd = bcrypt.hashSync(req.body.password, salt)
            var userModel = new application.app[api_version].models.user(this.connection);

            var data = await userModel.insertOne(email, pwd)
            if (data.code == 200) {
                var mailOptions = {
                    from: 'demo@andrealmeida.net',
                    to: email,
                    sub: 'demo: registo completo 🚀'
                };

                await register(mailOptions.from, mailOptions.to, mailOptions)
                return { code: 200, 'message': 'User created sucessfully!' };
            } else {
                return { code: data.code, error: data.error }
            }
        } catch (error) {
            console.log("error model auth signup --> " + error.stack);
            return { code: 500, error: 'Internal Server Error' }
        }
    }

    async requestpassword(application, req) {
        try {
            var user_model = new application.app[api_version].models.user(this.connection);
            var data = await user_model.getOne({ email: req.body.email })

            if (data != null) {
                let now = new Date()
                let ts = now.getTime() / 1000
                let randomUUID = uuid.v1() + "_" + Math.floor(ts);
                let confirmUUID = await user_model.getOne({ 'recover_token': randomUUID })

                if (confirmUUID == null) {
                    data.recover_token = randomUUID
                    data.recover_token_update = ts
                    await data.save()

                    var mailOptions = {
                        from: 'demo@andrealmeida.net',
                        to: data.email,
                        recover_token: data.recover_token,
                        sub: 'demo: recuperação de conta 🚀'
                    };

                    await passwordEmail(mailOptions.from, mailOptions.to, mailOptions)
                    return { code: 200, message: "Email sent" }
                } else {
                    return { code: 400, error: 'Bad Request' }
                }
            } else {
                return { code: 400, error: 'Bad Request' }
            }
        } catch (error) {
            console.log("error requestpassword --> " + error);
            return { code: 500, error: 'Internal Server Error' }
        }
    }

    async recoverpassword(application, req) {
        try {
            var user_model = new application.app[api_version].models.user(this.connection);
            var data = await user_model.getOne({ 'email': req.body.email, 'recover_token': req.body.recover_token })

            if (data != null) {
                data.password = bcrypt.hashSync(req.body.password, salt)
                data.recover_password = null;
                data.recover_token = null
                data.recover_token_update = null
                await data.save()
                return await this.generateToken(data)
            } else {
                return { code: 400, error: 'Bad Request' }
            }
        } catch (error) {
            console.log("error recoverpassword --> " + error);
            return { code: 500, error: 'Internal Server Error' }
        }
    }

    async changepassword(application, req) {
        try {
            var user_model = new application.app[api_version].models.user(this.connection);
            const auth_token = req.headers.hasOwnProperty('auth_token') ? req.headers.auth_token : req.headers.authorization

            var data = await user_model.getOne({ 'auth_token': auth_token, 'email': req.body.email })

            if (data != null) {
                data.password = bcrypt.hashSync(req.body.password, salt)
                await data.save()
                return await this.generateToken(data)
            } else {
                return { code: 400, error: 'Bad Request' }
            }
        } catch (error) {
            console.log("error changepassword --> " + error);
            return { code: 500, error: 'Internal Server Error' }
        }
    }

    async generateToken(user_model) {
        let now = new Date()
        let ts = Math.floor(now / 1000)

        let auth_expire = 60 * 60 // 1 hour
        var auth_token = jwt.sign({
            id: user_model.id
        }, tokenSecret, { expiresIn: auth_expire });

        user_model.auth_token = auth_token
        user_model.auth_token_update = ts
        await user_model.save()

        return {
            code: 200,
            result: {
                "user": {
                    "id": user_model.id,
                    "email": user_model.email,
                },
                "auth": {
                    "token": auth_token,
                    "created": ts,
                    "expires": ts + auth_expire
                }
            }
        }
    }

    async deleteaccount(application, req) {
        try {
            const auth_token = req.headers.hasOwnProperty('auth_token') ? req.headers.auth_token : req.headers.authorization

            var userModel = new application.app[api_version].models.user(this.connection);
            let result = await userModel.deleteOne(auth_token)

            if (result.code === 200) {
                return { code: result.code, 'message': 'User deleted successfully!' };
            } else {
                return { code: 400, error: 'User not found' }
            }
        } catch (error) {
            console.log("error model auth signup --> " + error.stack);
            return { code: 500, error: 'Internal Server Error' }
        }
    }
}

module.exports = function (application) {
    return auth;
}