const bcrypt = require('bcrypt');
const iocane = require("iocane");
const diskLogic = require('logic/disk.js');
// const dockerComposeLogic = require('logic/docker-compose.js');
// const lnapiService = require('services/lnapi.js');
const bashService = require('services/bash.js');
const NodeError = require('models/errors.js').NodeError;
const JWTHelper = require('utils/jwt.js');
const constants = require('utils/const.js');
const UUID = require('utils/UUID.js');

const saltRounds = 10;
const SYSTEM_USER = UUID.fetchBootUUID() || 'admin';

let devicePassword = '';
let changePasswordStatus;

resetChangePasswordStatus();

function resetChangePasswordStatus() {
    changePasswordStatus = { percent: 0 };
}

async function sleepSeconds(seconds) {
    return new Promise(resolve => {
        setTimeout(resolve, seconds * constants.TIME.ONE_SECOND_IN_MILLIS);
    });
}

// Caches the password.
function cachePassword(password) {
    devicePassword = password;
}

// Gets the cached the password.
function getCachedPassword() {
    return devicePassword;
}

// Change the device and lnd password.
async function changePassword(currentPassword, newPassword, jwt) {

    // restart lnd
    resetChangePasswordStatus();
    changePasswordStatus.percent = 1; // eslint-disable-line no-magic-numbers
    // await dockerComposeLogic.dockerComposeStop({ service: constants.SERVICES.LND });
    changePasswordStatus.percent = 40; // eslint-disable-line no-magic-numbers
    // await dockerComposeLogic.dockerComposeUpSingleService({ service: constants.SERVICES.LND });

    let complete = false;
    let attempt = 0;
    const MAX_ATTEMPTS = 20;

    do {
        try {
            attempt++;

            // call lnapi to change password
            changePasswordStatus.percent = 60 + attempt; // eslint-disable-line no-magic-numbers
            // await lnapiService.changePassword(currentPassword, newPassword, jwt);

            // make new password file
            const credentials = hashCredentials(SYSTEM_USER, newPassword);

            // replace user file
            await diskLogic.deleteUserFile();
            await diskLogic.writeUserFile({ password: credentials.password });

            // update ssh password
            await hashAccountPassword(newPassword);

            complete = true;

            // cache the password for later use
            cachePassword(newPassword);

            changePasswordStatus.percent = 100;
        } catch (error) {

            // wait for lnd to boot up
            if (error.response.status === constants.STATUS_CODES.BAD_GATEWAY) {
                await sleepSeconds(1);

                // user supplied incorrect credentials
            } else if (error.response.status === constants.STATUS_CODES.FORBIDDEN) {
                changePasswordStatus.forbidden = true;

                // unknown error occurred
            } else {
                changePasswordStatus.error = true;
                changePasswordStatus.percent = 100;

                throw error;
            }
        }
    } while (!complete && attempt < MAX_ATTEMPTS && !changePasswordStatus.unauthorized && !changePasswordStatus.error);

    if (!complete && attempt === MAX_ATTEMPTS) {
        changePasswordStatus.error = true;
        changePasswordStatus.percent = 100;

        throw new Error('Unable to change password. Lnd would not restart properly.');
    }

}

function getChangePasswordStatus() {
    return changePasswordStatus;
}

// Returns an object with the hashed credentials inside.
function hashCredentials(username, password) {
    const hash = bcrypt.hashSync(password, saltRounds);

    return { password: hash, username, plainTextPassword: password };
}

// Returns true if the user is registered otherwise false.
async function isRegistered() {
    try {
        await diskLogic.readUserFile();

        return { registered: true };
    } catch (error) {
        return { registered: false };
    }
}

// Log the user into the device. Caches the password if login is successful. Then returns jwt.
async function login(user) {
    try {
        const jwt = await JWTHelper.generateJWT(user.username);

        // Cache plain text password
        // cachePassword(user.plainTextPassword);
        cachePassword(user.password);

        return { jwt: jwt };

    } catch (error) {
        console.log(error);
        throw new NodeError('Unable to generate JWT');
    }
}

async function seed(user) {

    //Decrypt mnemonic seed
    try {
        const { seed } = await diskLogic.readUserFile();

        const decryptedSeed = await iocane.createSession().decrypt(seed, user.plainTextPassword);

        return { seed: decryptedSeed.split(",") };

    } catch (error) {
        throw new NodeError('Unable to decrypt mnemonic seed');
    }
}

// Registers the the user to the device. Returns an error if a user already exists.
async function register(user, seed) {
    if ((await isRegistered()).registered) {
        throw new NodeError('User already exists', 400); // eslint-disable-line no-magic-numbers
    }

    //Encrypt mnemonic seed for storage
    let encryptedSeed;
    try {
        encryptedSeed = await iocane.createSession().encrypt(seed.join(), user.plainTextPassword);
    } catch (error) {
        throw new NodeError('Unable to encrypt mnemonic seed');
    }

    //save user
    try {
        await diskLogic.writeUserFile({ name: user.name, password: user.password, seed: encryptedSeed });
    } catch (error) {
        throw new NodeError('Unable to register user');
    }

    //generate JWt
    let jwt;
    try {
        jwt = await JWTHelper.generateJWT(user.username);
    } catch (error) {
        throw new NodeError('Unable to generate JWT');
    }

    //initialize lnd wallet
    try {
        // await lnapiService.initializeWallet(user.plainTextPassword, seed, jwt);
    } catch (error) {
        await diskLogic.deleteUserFile();
        throw new NodeError(error.response.data);
    }

    //return token
    return { jwt: jwt };
}

// Generate and return a new jwt token.
async function refresh(user) {
    try {
        const jwt = await JWTHelper.generateJWT(user.username);

        return { jwt: jwt };
    } catch (error) {
        throw new NodeError('Unable to generate JWT');
    }
}


module.exports = {
    changePassword,
    getCachedPassword,
    getChangePasswordStatus,
    hashCredentials,
    isRegistered,
    seed,
    login,
    register,
    refresh,
};