#!/usr/bin/env node

/**
 * Module dependencies.
 */

const program = require('./commander');
const inquirer = require('inquirer');
const UsersService = require('../services/users');
const UserModel = require('../models/user');
const mongoose = require('../services/mongoose');
const util = require('./util');
const Table = require('cli-table');

const validateRequired = (msg = 'Field is required', len = 1) => (input) => {
  if (input && input.length >= len) {
    return true;
  }

  return msg;
};

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

function getUserCreateAnswers(options) {
  if (options.flag_mode) {

    let user = {
      email: options.email,
      password: options.password,
      confirmPassword: options.password,
      username: options.name,
      roles: []
    };

    if (options.role && UserModel.USER_ROLES.indexOf(options.role) > -1) {
      user.roles = [options.role];
    }

    return Promise.resolve(user);
  }

  return inquirer.prompt([
    {
      name: 'email',
      message: 'Email',
      format: 'email',
      validate: validateRequired('Email is required')
    },
    {
      name: 'password',
      message: 'Password',
      type: 'password',
      filter: (password) => {
        return UsersService
          .isValidPassword(password)
          .catch((err) => {
            throw err.message;
          });
      }
    },
    {
      name: 'confirmPassword',
      message: 'Confirm Password',
      type: 'password',
      filter: (confirmPassword) => {
        return UsersService
          .isValidPassword(confirmPassword)
          .catch((err) => {
            throw err.message;
          });
      }
    },
    {
      name: 'username',
      message: 'Username',
      filter: (username) => {
        return UsersService
          .isValidDisplayName(username)
          .catch((err) => {
            throw err.message;
          });
      }
    },
    {
      name: 'roles',
      message: 'User Role',
      type: 'checkbox',
      choices: UserModel.USER_ROLES
    }
  ]);
}

/**
 * Prompts for input and registers a user based on those.
 */
function createUser(options) {
  getUserCreateAnswers(options)
    .then((answers) => {
      if (answers.password !== answers.confirmPassword) {
        return Promise.reject(new Error('Passwords do not match'));
      }

      return answers;
    })
    .then((answers) => {
      return UsersService
        .createLocalUser(answers.email.trim(), answers.password.trim(), answers.username.trim())
        .then((user) => {
          console.log(`Created user ${user.id}.`);

          if (answers.roles.length > 0) {
            return Promise.all(answers.roles.map((role) => {
              return UsersService
                .addRoleToUser(user.id, role)
                .then(() => {
                  console.log(`Added the role ${role} to User ${user.id}.`);
                });
            }));
          }
        });
    })
    .then(() => {
      util.shutdown();
    })
    .catch((err) => {
      console.error(err);
      util.shutdown();
    });
}

/**
 * Deletes a user.
 */
function deleteUser(userID) {
  UserModel
    .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) {
  inquirer.prompt([
    {
      name: 'password',
      message: 'Password',
      type: 'password',
      validate: validateRequired('Password is required')
    },
    {
      name: 'confirmPassword',
      message: 'Confirm Password',
      type: 'password',
      validate: validateRequired('Confirm Password is required')
    }
  ])
  .then((answers) => {
    if (answers.password !== answers.confirmPassword) {
      return Promise.reject(new Error('Password mismatch'));
    }

    return UsersService.changePassword(userID, answers.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 = UserModel.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 = UserModel.update({
      'id': userID
    }, {
      $set: {
        username: 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() {
  UsersService
    .all()
    .then((users) => {
      let table = new Table({
        head: [
          'ID',
          'Username',
          'Profiles',
          'Roles',
          'Status',
          'State'
        ]
      });

      users.forEach((user) => {
        table.push([
          user.id,
          user.username,
          user.profiles.map((p) => p.provider).join(', '),
          user.roles.join(', '),
          user.status,
          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) {
  UsersService
    .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) {

  if (UserModel.USER_ROLES.indexOf(role) === -1) {
    console.error(`Role '${role}' is not supported. Supported roles are ${UserModel.USER_ROLES.join(', ')}.`);
    util.shutdown(1);
    return;
  }

  UsersService
    .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) {

  if (UserModel.USER_ROLES.indexOf(role) === -1) {
    console.error(`Role '${role}' is not supported. Supported roles are ${UserModel.USER_ROLES.join(', ')}.`);
    util.shutdown(1);
    return;
  }

  UsersService
    .removeRoleFromUser(userID, role)
    .then(() => {
      console.log(`Removed the ${role} role from User ${userID}.`);
      util.shutdown();
    })
    .catch((err) => {
      console.error(err);
      util.shutdown(1);
    });
}

/**
 * Ban a user
 * @param  {String} userID id of the user to ban
 */
function ban(userID) {
  UsersService
    .setStatus(userID, 'BANNED')
    .then(() => {
      console.log(`Banned the User ${userID}.`);
      util.shutdown();
    })
    .catch((err) => {
      console.error(err);
      util.shutdown(1);
    });
}

/**
 * Unban a user
 * @param  {String} userUD id of the user to remove the role from
 */
function unban(userID) {
  UsersService
    .setStatus(userID, 'ACTIVE')
    .then(() => {
      console.log(`Unban the 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) {
  UsersService
    .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) {
  UsersService
    .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
  .command('create')
  .option('--email [email]', 'Email to use')
  .option('--password [password]', 'Password to use')
  .option('--name [name]', 'Name to use')
  .option('--role [role]', 'Role to add')
  .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('ban <userID>')
  .description('ban a given user')
  .action(ban);

program
  .command('uban <userID>')
  .description('unban a given user')
  .action(unban);

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();
}