#!/usr/bin/env ruby

require "thor"

class DiscourseCLI < Thor
  class_option :verbose, default: false, aliases: :v

  desc "remap", "Remap a string sequence accross all tables"
  def remap(from, to)
    load_rails

    puts "Rewriting all occurences of #{from} to #{to}"
    puts "THIS TASK WILL REWRITE DATA, ARE YOU SURE (type YES)"
    text = STDIN.gets
    if text.strip != "YES"
      puts "aborting."
      exit
    end

    sql = "SELECT table_name, column_name
FROM information_schema.columns
WHERE table_schema='public' and (data_type like 'char%' or data_type like 'text%')"

    cnn = ActiveRecord::Base.connection.raw_connection

    results = cnn.async_exec(sql).to_a

    results.each do |result|
      table_name = result["table_name"]
      column_name = result["column_name"]
      puts "Remapping #{table_name} #{column_name}"
      result = cnn.async_exec("UPDATE #{table_name}
                      SET #{column_name} = replace(#{column_name}, $1, $2)
                      WHERE NOT #{column_name} IS NULL
                        AND #{column_name} <> replace(#{column_name}, $1, $2)", [from, to])
      puts "#{result.cmd_tuples} rows affected!"
    end

  end

  desc "backup", "Backup a discourse forum"
  def backup(filename = nil)
    load_rails
    require "backup_restore"
    require "export/exporter"

    puts "Starting export..."
    backup = Export::Exporter.new(Discourse.system_user.id).run
    if filename.present?
      puts "Moving '#{backup}' to '#{filename}'"
      FileUtils.mv(backup, filename)
      backup = filename
    end
    puts "Export done."
    puts "Output file is in: #{backup}", ""
  end

  desc "export", "Backup a Discourse forum"
  def export
    backup
  end

  desc "restore", "Restore a Discourse backup"
  def restore(filename)
    load_rails
    require "backup_restore"
    require "import/importer"

    begin
      puts "Starting restore: #{filename}"
      Import::Importer.new(Discourse.system_user.id, filename).run
      puts 'Restore done.'
    rescue Import::FilenameMissingError
      puts '', 'The filename argument was missing.', ''
      usage
    rescue Import::ImportDisabledError
      puts '', 'Restores are not allowed.', 'An admin needs to set allow_restore to true in the site settings before restores can be run.', ''
      puts 'Restore cancelled.', ''
    end
  end

  desc "import", "Restore a Discourse backup"
  def import(filename)
    restore(filename)
  end

  desc "rollback", "Rollback to the previous working state"
  def rollback
    load_rails
    require "backup_restore"

    puts 'Rolling back if needed..'
    BackupRestore.rollback!
    puts 'Done.'
  end

  desc "enable_restore", "Allow restore operations"
  def enable_restore
    load_rails
    require "site_setting"

    SiteSetting.allow_restore = true
    puts 'Restore are now permitted. Disable them with `disable_restore`'
  end

  desc "disable_restore", "Forbid restore operations"
  def disable_restore
    load_rails
    require "site_setting"

    SiteSetting.allow_restore = false
    puts 'Restore are now forbidden. Enable them with `enable_restore`'
  end

  desc "enable_readonly", "Enable the readonly mode"
  def enable_readonly
    load_rails

    Discourse.enable_readonly_mode
    puts 'The site is now in readonly mode.'
  end

  desc "disable_readonly", "Disable the readonly mode"
  def disable_readonly
    load_rails

    Discourse.disable_readonly_mode
    puts 'The site is now fully operable.'
  end

  desc "request_refresh", "Ask all clients to refresh the browser"
  def request_refresh
    load_rails

    Discourse.request_refresh!
    puts 'Requests sent. Clients will refresh on next navigation.'
  end

  private

  def load_rails
    require File.expand_path(File.dirname(__FILE__) + "/../config/environment")
  end

  def schemaless(url)
    url.gsub(/^https?:/, "")
  end

end

DiscourseCLI.start(ARGV)