const User = use('App/Models/User');
const Service = use('App/Models/Service');
const Workspace = use('App/Models/Workspace');
const { validateAll } = use('Validator');
const Env = use('Env');

const atob = require('atob');
const btoa = require('btoa');
const fetch = require('node-fetch');
const { v4: uuid } = require('uuid');
const crypto = require('crypto');

const franzRequest = (route, method, auth) =>
  new Promise((resolve, reject) => {
    const base = 'https://api.franzinfra.com/v1/';
    const user =
      'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Ferdi/5.3.0-beta.1 Chrome/69.0.3497.128 Electron/4.2.4 Safari/537.36';

    try {
      fetch(base + route, {
        method,
        headers: {
          Authorization: `Bearer ${auth}`,
          'User-Agent': user,
        },
      })
        .then(data => data.json())
        .then(json => resolve(json));
    } catch (e) {
      reject();
    }
  });

class UserController {
  // Register a new user
  async signup({ request, response, auth }) {
    if (Env.get('IS_REGISTRATION_ENABLED') == 'false') {
      // eslint-disable-line eqeqeq
      return response.status(401).send({
        message: 'Registration is disabled on this server',
        status: 401,
      });
    }

    // Validate user input
    const validation = await validateAll(request.all(), {
      firstname: 'required',
      lastname: 'required',
      email: 'required|email|unique:users,email',
      password: 'required',
    });

    if (validation.fails()) {
      return response.status(401).send({
        message: 'Invalid POST arguments',
        messages: validation.messages(),
        status: 401,
      });
    }

    const data = request.only(['firstname', 'lastname', 'email', 'password']);

    // Create user in DB
    let user;
    try {
      user = await User.create({
        email: data.email,
        password: data.password,
        username: data.firstname,
        lastname: data.lastname,
      });
    } catch (e) {
      return response.status(401).send({
        message: 'E-Mail Address already in use',
        status: 401,
      });
    }

    // Generate new auth token
    const token = await auth.generate(user);

    return response.send({
      message: 'Successfully created account',
      token: token.token,
    });
  }

  // Login using an existing user
  async login({ request, response, auth }) {
    if (!request.header('Authorization')) {
      return response.status(401).send({
        message: 'Please provide authorization',
        status: 401,
      });
    }

    // Get auth data from auth token
    const authHeader = atob(
      request.header('Authorization').replace('Basic ', ''),
    ).split(':');

    // Check if user with email exists
    const user = await User.query().where('email', authHeader[0]).first();
    if (!user || !user.email) {
      return response.status(401).send({
        message: 'User credentials not valid (Invalid mail)',
        code: 'invalid-credentials',
        status: 401,
      });
    }

    // Try to login
    let token;
    try {
      token = await auth.attempt(user.email, authHeader[1]);
    } catch (e) {
      return response.status(401).send({
        message: 'User credentials not valid',
        code: 'invalid-credentials',
        status: 401,
      });
    }

    return response.send({
      message: 'Successfully logged in',
      token: token.token,
    });
  }

  // Return information about the current user
  async me({ response, auth }) {
    try {
      await auth.getUser();
    } catch (error) {
      response.send('Missing or invalid api token');
    }

    const settings =
      typeof auth.user.settings === 'string'
        ? JSON.parse(auth.user.settings)
        : auth.user.settings;

    return response.send({
      accountType: 'individual',
      beta: false,
      donor: {},
      email: auth.user.email,
      emailValidated: true,
      features: {},
      firstname: auth.user.username,
      id: '82c1cf9d-ab58-4da2-b55e-aaa41d2142d8',
      isPremium: true,
      isSubscriptionOwner: true,
      lastname: auth.user.lastname,
      locale: 'en-US',
      ...(settings || {}),
    });
  }

  async updateMe({ request, response, auth }) {
    let settings = auth.user.settings || {};
    if (typeof settings === 'string') {
      settings = JSON.parse(settings);
    }

    const newSettings = {
      ...settings,
      ...request.all(),
    };

    // eslint-disable-next-line no-param-reassign
    auth.user.settings = JSON.stringify(newSettings);
    await auth.user.save();

    return response.send({
      data: {
        accountType: 'individual',
        beta: false,
        donor: {},
        email: auth.user.email,
        emailValidated: true,
        features: {},
        firstname: auth.user.username,
        id: '82c1cf9d-ab58-4da2-b55e-aaa41d2142d8',
        isPremium: true,
        isSubscriptionOwner: true,
        lastname: auth.user.lastname,
        locale: 'en-US',
        ...(newSettings || {}),
      },
      status: ['data-updated'],
    });
  }

  async import({ request, response, view }) {
    if (Env.get('IS_REGISTRATION_ENABLED') == 'false') {
      // eslint-disable-line eqeqeq
      return response.status(401).send({
        message: 'Registration is disabled on this server',
        status: 401,
      });
    }

    // Validate user input
    const validation = await validateAll(request.all(), {
      email: 'required|email|unique:users,email',
      password: 'required',
    });
    if (validation.fails()) {
      let errorMessage =
        'There was an error while trying to import your account:\n';
      for (const message of validation.messages()) {
        if (message.validation === 'required') {
          errorMessage += `- Please make sure to supply your ${message.field}\n`;
        } else if (message.validation === 'unique') {
          errorMessage += '- There is already a user with this email.\n';
        } else {
          errorMessage += `${message.message}\n`;
        }
      }
      return view.render('others.message', {
        heading: 'Error while importing',
        text: errorMessage,
      });
    }

    const { email, password } = request.all();

    const hashedPassword = crypto
      .createHash('sha256')
      .update(password)
      .digest('base64');

    if (Env.get('CONNECT_WITH_FRANZ') == 'false') {
      // eslint-disable-line eqeqeq
      await User.create({
        email,
        password: hashedPassword,
        username: 'Franz',
        lastname: 'Franz',
      });

      return response.send(
        "Your account has been created but due to this server's configuration, we could not import your Franz account data.\n\nIf you are the server owner, please set CONNECT_WITH_FRANZ to true to enable account imports.",
      );
    }

    const base = 'https://api.franzinfra.com/v1/';
    const userAgent =
      'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Ferdi/5.3.0-beta.1 Chrome/69.0.3497.128 Electron/4.2.4 Safari/537.36';

    // Try to get an authentication token
    let token;
    try {
      const basicToken = btoa(`${email}:${hashedPassword}`);
      const loginBody = {
        isZendeskLogin: false,
      };

      const rawResponse = await fetch(`${base}auth/login`, {
        method: 'POST',
        body: JSON.stringify(loginBody),
        headers: {
          Authorization: `Basic ${basicToken}`,
          'User-Agent': userAgent,
          'Content-Type': 'application/json',
          accept: '*/*',
          'x-franz-source': 'Web',
        },
      });
      const content = await rawResponse.json();

      if (!content.message || content.message !== 'Successfully logged in') {
        const errorMessage =
          'Could not login into Franz with your supplied credentials. Please check and try again';
        return response.status(401).send(errorMessage);
      }

      token = content.token;
    } catch (e) {
      return response.status(401).send({
        message: 'Cannot login to Franz',
        error: e,
      });
    }

    // Get user information
    let userInf = false;
    try {
      userInf = await franzRequest('me', 'GET', token);
    } catch (e) {
      const errorMessage = `Could not get your user info from Franz. Please check your credentials or try again later.\nError: ${e}`;
      return response.status(401).send(errorMessage);
    }
    if (!userInf) {
      const errorMessage =
        'Could not get your user info from Franz. Please check your credentials or try again later';
      return response.status(401).send(errorMessage);
    }

    // Create user in DB
    let user;
    try {
      user = await User.create({
        email: userInf.email,
        password: hashedPassword,
        username: userInf.firstname,
        lastname: userInf.lastname,
      });
    } catch (e) {
      const errorMessage = `Could not create your user in our system.\nError: ${e}`;
      return response.status(401).send(errorMessage);
    }

    const serviceIdTranslation = {};

    // Import services
    try {
      const services = await franzRequest('me/services', 'GET', token);

      for (const service of services) {
        // Get new, unused uuid
        let serviceId;
        do {
          serviceId = uuid();
        } while (
          (await Service.query().where('serviceId', serviceId).fetch()).rows
            .length > 0
        ); // eslint-disable-line no-await-in-loop

        await Service.create({
          // eslint-disable-line no-await-in-loop
          userId: user.id,
          serviceId,
          name: service.name,
          recipeId: service.recipeId,
          settings: JSON.stringify(service),
        });

        serviceIdTranslation[service.id] = serviceId;
      }
    } catch (e) {
      const errorMessage = `Could not import your services into our system.\nError: ${e}`;
      return response.status(401).send(errorMessage);
    }

    // Import workspaces
    try {
      const workspaces = await franzRequest('workspace', 'GET', token);

      for (const workspace of workspaces) {
        let workspaceId;
        do {
          workspaceId = uuid();
        } while (
          (await Workspace.query().where('workspaceId', workspaceId).fetch())
            .rows.length > 0
        ); // eslint-disable-line no-await-in-loop

        const services = workspace.services.map(
          service => serviceIdTranslation[service],
        );

        await Workspace.create({
          // eslint-disable-line no-await-in-loop
          userId: user.id,
          workspaceId,
          name: workspace.name,
          order: workspace.order,
          services: JSON.stringify(services),
          data: JSON.stringify({}),
        });
      }
    } catch (e) {
      const errorMessage = `Could not import your workspaces into our system.\nError: ${e}`;
      return response.status(401).send(errorMessage);
    }

    return response.send(
      'Your account has been imported. You can now use your Franz account in Ferdi.',
    );
  }
}

module.exports = UserController;