#!/usr/bin/env node

/**
 * Module dependencies.
 */

const util = require('./util');
const program = require('commander');
const inquirer = require('inquirer');
const {graphql} = require('graphql');
const {stripIndent} = require('common-tags');
const Table = require('cli-table');

// Make things colorful!
require('colors');

// Register the autocomplete plugin.
inquirer.registerPrompt('autocomplete', require('inquirer-autocomplete-prompt'));

const schema = require('../graph/schema');
const Context = require('../graph/context');
const UsersService = require('../services/users');
const UserModel = require('../models/user');
const CommentModel = require('../models/comment');
const ActionModel = require('../models/action');
const USER_ROLES = require('../models/enum/user_roles');
const mongoose = require('../services/mongoose');
const databaseVerifications = require('./verifications/database');

// Register the shutdown criteria.
util.onshutdown([
  () => mongoose.disconnect()
]);

/**
 * Deletes a user and cleans up their associated verifications.
 */
async function deleteUser(userID) {

  try {

    // Find the user we're removing.
    const user = await UserModel.findOne({id: userID});
    if (!user) {
      throw new Error(`user with id ${userID} not found`);
    }

    printUserAsTable(user);

    console.warn(stripIndent`

    This will delete the above user.

    This might take a long time if there is a lot of data, please confirm that
    you want to continue.
    `);
    const {confirm} = await inquirer.prompt({
      type: 'confirm',
      name: 'confirm',
      message: 'Continue',
      default: false,
    });
    if (!confirm) {
      return util.shutdown();
    }

    console.warn('Removing user\'s actions');

    // Remove all the user's actions.
    await ActionModel
      .where({user_id: user.id})
      .setOptions({multi: true})
      .remove();

    console.warn('Removing user\'s comments');

    // Remove all the user's comments.
    await CommentModel
      .where({author_id: user.id})
      .setOptions({multi: true})
      .remove();

    console.warn('Updating the database indexes');

    // Update the counts that might have changed.
    for (const verification of databaseVerifications) {
      await verification({fix: true, limit: Infinity, batch: 1000});
    }

    console.warn('Removing the user');

    // Remove the user.
    await user.remove();

    util.shutdown();
  } catch (err) {
    console.error(err);
    util.shutdown(1);
  }
}

function printUserAsTable(user) {
  let table = new Table({});

  table.push(
    {'ID': user.id.gray},
    {'Username': user.username},
    {'Emails': user.emails},
    {'Tags': user.tags ? user.tags.map(({tag: {name}}) => name) : ''},
    {'Role': user.role},
    {'Verified': user.hasVerifiedEmail},
    {'Username': user.status.username.status},
    {'Banned': user.banned},
    {'Suspension': user.suspended ? `Until ${user.status.suspension.until}` : false},
  );

  console.log(table.toString());
}

/**
 * Searches for users based on their username and email address.
 */
async function searchUsers() {
  const ctx = Context.forSystem();
  const searchQuery = `
    query SearchUsers($value: String) {
      users(query: {value: $value}) {
        nodes {
          id
          username
          role
          profiles {
            id
            provider
          }
        }
      }
    }
  `;

  try {
    const answers = await inquirer.prompt({
      type: 'autocomplete',
      name: 'userID',
      message: 'Search for a user',
      source: async (answers, value) => {
        if (value === null) {
          value = '';
        }

        const {data, errors} = await graphql(schema, searchQuery, {}, ctx, {
          value,
        });
        if (errors && errors.length > 0) {
          throw errors[0];
        }

        if (data.users === null) {
          return [];
        }

        return data.users.nodes.map((user) => {
          const emails = user.emails.join(', ');
          return {
            name: `${user.username} (${emails}) ${user.id.gray} - ${user.role.gray}`,
            value: user.id,
          };
        });
      }
    });

    const {userID} = answers;
    const user = await UserModel.findOne({id: userID});

    printUserAsTable(user);
    util.shutdown(0);
  } catch (err) {
    console.error(err);
    util.shutdown(1);
  }
}

/**
 * Adds a role to a user
 * @param  {String} userUD id of the user to add the role to
 * @param  {String} role   the role to add
 */
async function setUserRole(userID) {
  try {
    const {role} = await inquirer.prompt([
      {
        name: 'role',
        message: 'User Role',
        type: 'list',
        choices: USER_ROLES
      }
    ]);

    await UsersService.setRole(userID, role);

    console.log(`Set User ${userID} to the ${role} role.`);
    util.shutdown();
  } catch (err) {
    console.error(err);
    util.shutdown(1);
  }

}

/**
 * Verifies an email address for a user.
 *
 * @param userID the user's id
 * @param email  the user's email address to be verified, otherwise verifies the
 *               first email if there is one, if there are multiple, you get a
 *               prompt.
 */
async function verifyUserEmail(userID, email) {
  try {

    // Get the user.
    const user = await UserModel.findOne({id: userID});
    if (!user) {
      throw new Error(`user with ID ${userID} cannot be found`);
    }

    // Get all the user's email addresses.
    const emails = user.emails;
    if (emails.length === 0) {
      throw new Error('user did not have any email addresses');
    }

    if (!email && emails.length === 1) {

      // The email wasn't passed, and there is only one option.
      email = emails[0];
    } else if (!emails.includes(email)){

      // The email passed doesn't belong to this user.
      throw new Error(`user does not have the email ${email}`);
    } else if (emails.length > 1) {

      // The email wasn't passed, and there is more than one choice.
      const answers = await inquirer.prompt([
        {
          name: 'email',
          message: 'Select Email to Verify',
          type: 'list',
          choices: emails
        }
      ]);

      email = answers.email;
    }

    // Verify the email.
    await UsersService.confirmEmail(userID, email);
    console.log(`User ${userID} had their email ${email} verified.`);
    util.shutdown();
  } catch (err) {
    console.error(err);
    util.shutdown(1);
  }
}

//==============================================================================
// Setting up the program command line arguments.
//==============================================================================

program
  .command('delete <userID>')
  .description('delete a user')
  .action(deleteUser);

program
  .command('search')
  .description('searches for a user based on their stored username and email')
  .action(searchUsers);

program
  .command('set-role <userID> <role>')
  .description('sets the role on a user')
  .action(setUserRole);

program
  .command('verify <userID> <email>')
  .description('verifies the given user\'s email address')
  .action(verifyUserEmail);

program.parse(process.argv);

// If there is no command listed, output help.
if (!process.argv.slice(2).length) {
  program.outputHelp();
  util.shutdown();
}