#!/usr/bin/env node

/**
 * Setup the debug paramater.
 */

process.env.DEBUG = process.env.TALK_DEBUG;

/**
 * Module dependencies.
 */

const program = require('commander');
const pkg = require('../package.json');
const prompt = require('prompt');
const User = require('../models/user');
const mongoose = require('../mongoose');
const util = require('../util');
const Table = require('cli-table');

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

/**
 * Prompts for input and registers a user based on those.
 */
function createUser(options) {
  return new Promise((resolve, reject) => {

    if (options.flag_mode) {
      return resolve({
        email: options.email,
        password: options.password,
        displayName: options.name,
      });
    }

    prompt.start();

    prompt.get([
      {
        name: 'email',
        description: 'Email',
        format: 'email',
        required: true
      },
      {
        name: 'password',
        description: 'Password',
        hidden: true,
        required: true
      },
      {
        name: 'confirmPassword',
        description: 'Confirm Password',
        hidden: true,
        required: true
      },
      {
        name: 'displayName',
        description: 'Display Name',
        required: true
      }
    ], (err, result) => {
      if (err) {
        return reject(err);
      }

      if (result.password !== result.confirmPassword) {
        return reject(new Error('Passwords do not match'));
      }

      resolve(result);
    });
  })
  .then((result) => {
    return User.createLocalUser(result.email.trim(), result.password.trim(), result.displayName.trim());
  })
  .then((user) => {
    console.log(`Created user ${user.id}.`);
    util.shutdown();
  })
  .catch((err) => {
    console.error(err);
    util.shutdown();
  });
}

/**
 * Deletes a user.
 */
function deleteUser(userID) {
  User
    .findOneAndRemove({
      id: userID
    })
    .then(() => {
      console.log('Deleted user');
      util.shutdown();
    })
    .catch((err) => {
      console.error(err);
      util.shutdown();
    });
}

/**
 * Changes the password for a user.
 */
function passwd(userID) {
  prompt.start();

  prompt.get([
    {
      name: 'password',
      description: 'Password',
      hidden: true,
      required: true
    },
    {
      name: 'confirmPassword',
      description: 'Confirm Password',
      hidden: true,
      required: true
    }
  ], (err, result) => {
    if (err) {
      console.error(err);
      util.shutdown();
      return;
    }

    if (result.password !== result.confirmPassword) {
      console.error(new Error('Password mismatch'));
      util.shutdown(1);
      return;
    }

    User
      .changePassword(userID, result.password)
      .then(() => {
        console.log('Password changed.');
        util.shutdown();
      })
      .catch((err) => {
        console.error(err);
        util.shutdown(1);
      });
  });
}

/**
 * Updates the user from the options array.
 */
function updateUser(userID, options) {
  const updates = [];

  if (options.email && typeof options.email === 'string' && options.email.length > 0) {
    let q = User.update({
      'id': userID,
      'profiles.provider': 'local'
    }, {
      $set: {
        'profiles.$.id': options.email
      }
    });

    updates.push(q);
  }

  if (options.name && typeof options.name === 'string' && options.name.length > 0) {
    let q = User.update({
      'id': userID
    }, {
      $set: {
        displayName: options.name
      }
    });

    updates.push(q);
  }

  Promise
    .all(updates.map((q) => q.exec()))
    .then(() => {
      console.log(`User ${userID} updated.`);
      util.shutdown();
    })
    .catch((err) => {
      console.error(err);
      util.shutdown(1);
    });
}

/**
 * Lists all the users registered in the database.
 */
function listUsers() {
  User
    .all()
    .then((users) => {
      let table = new Table({
        head: [
          'ID',
          'Display Name',
          'Profiles',
          'Roles',
          'State'
        ]
      });

      users.forEach((user) => {
        table.push([
          user.id,
          user.displayName,
          user.profiles.map((p) => p.provider).join(', '),
          user.roles.join(', '),
          user.disabled ? 'Disabled' : 'Enabled'
        ]);
      });

      console.log(table.toString());
      util.shutdown();
    })
    .catch((err) => {
      console.error(err);
      util.shutdown(1);
    });
}

/**
 * Merges two users using the specified ID's.
 * @param  {String} dstUserID id of the user to which is the target of the merge
 * @param  {String} srcUserID id of the user to which is the source of the merge
 */
function mergeUsers(dstUserID, srcUserID) {
  User
    .mergeUsers(dstUserID, srcUserID)
    .then(() => {
      console.log(`User ${srcUserID} was merged into user ${dstUserID}.`);
      util.shutdown();
    })
    .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
 */
function addRole(userID, role) {
  User
    .addRoleToUser(userID, role)
    .then(() => {
      console.log(`Added the ${role} role to User ${userID}.`);
      util.shutdown();
    })
    .catch((err) => {
      console.error(err);
      util.shutdown(1);
    });
}

/**
 * Removes a role from a user
 * @param  {String} userUD id of the user to remove the role from
 * @param  {String} role   the role to remove
 */
function removeRole(userID, role) {
  User
    .removeRoleFromUser(userID, role)
    .then(() => {
      console.log(`Removed the ${role} role from User ${userID}.`);
      util.shutdown();
    })
    .catch((err) => {
      console.error(err);
      util.shutdown(1);
    });
}

/**
 * Disable a given user.
 * @param  {String} userID the ID of a user to disable
 */
function disableUser(userID) {
  User
    .disableUser(userID)
    .then(() => {
      console.log(`User ${userID} was disabled.`);
      util.shutdown();
    })
    .catch((err) => {
      console.error(err);
      util.shutdown(1);
    });
}

/**
 * Enabled a given user.
 * @param  {String} userID the ID of a user to enable
 */
function enableUser(userID) {
  User
    .enableUser(userID)
    .then(() => {
      console.log(`User ${userID} was enabled.`);
      util.shutdown();
    })
    .catch((err) => {
      console.error(err);
      util.shutdown(1);
    });
}

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

program
  .version(pkg.version);

program
  .command('create')
  .option('--email [email]', 'Email to use')
  .option('--password [password]', 'Password to use')
  .option('--name [name]', 'Name to use')
  .option('-f, --flag_mode', 'Source from flags instead of prompting')
  .description('create a new user')
  .action(createUser);

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

program
  .command('passwd <userID>')
  .description('change a password for a user')
  .action(passwd);

program
  .command('update <userID>')
  .option('--email [email]', 'Email to use')
  .option('--name [name]', 'Name to use')
  .description('update a user')
  .action(updateUser);

program
  .command('list')
  .description('list all the users in the database')
  .action(listUsers);

program
  .command('merge <dstUserID> <srcUserID>')
  .description('merge srcUser into the dstUser')
  .action(mergeUsers);

program
  .command('addrole <userID> <role>')
  .description('adds a role to a given user')
  .action(addRole);

program
  .command('removerole <userID> <role>')
  .description('removes a role from a given user')
  .action(removeRole);

program
  .command('disable <userID>')
  .description('disable a given user from logging in')
  .action(disableUser);

program
  .command('enable <userID>')
  .description('enable a given user from logging in')
  .action(enableUser);

program.parse(process.argv);

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