#!/usr/bin/env ruby

require "thor"

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

  desc "remap [--global,--regex] FROM TO", "Remap a string sequence accross all tables"
  long_desc <<-LONGDESC
    Replace a string sequence FROM with TO across all tables.

    With --global option, the remapping is run on ***ALL***
    databases. Instead of just running on the current database, run on
    every database on this machine. This option is useful for
    multi-site setups.

    With --regex option, use PostgreSQL function regexp_replace to do
    the remapping. Enabling this interprets FROM as a PostgreSQL
    regular expression. TO can contain references to captures in the
    FROM match. See the "Regular Expression Details" section and
    "regexp_replace" documentation in the PostgreSQL manual for more
    details.


    Examples:

    discourse remap talk.foo.com talk.bar.com # renaming a Discourse domain name

    discourse remap --regex "\[\/?color(=[^\]]*)*]" "" # removing "color" bbcodes
  LONGDESC
  option :global, :type => :boolean
  option :regex, :type => :boolean
  def remap(from, to)
    load_rails

    if options[:regex]
      puts "Rewriting all occurences of #{from} to #{to} using regexp_replace"
    else
      puts "Rewriting all occurences of #{from} to #{to}"
    end
    puts "THIS TASK WILL REWRITE DATA, ARE YOU SURE (type YES)"
    puts "WILL RUN ON ALL #{RailsMultisite::ConnectionManagement.all_dbs.length} DBS" if options[:global]
    text = STDIN.gets
    if text.strip != "YES"
      puts "aborting."
      exit
    end

    if options[:global]
      RailsMultisite::ConnectionManagement.each_connection do |db|
        puts "","Remapping tables on #{db}...",""
        do_remap(from, to, options[:regex])
      end
    else
      do_remap(from, to, options[:regex])
    end
  end

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

    puts "Starting backup..."
    backuper = BackupRestore::Backuper.new(Discourse.system_user.id)
    backup = backuper.run
    if filename.present?
      puts "Moving '#{backup}' to '#{filename}'"
      puts "Including version number into '#{filename}'"
      version_string = File.basename(backup)[/-#{BackupRestore::VERSION_PREFIX}\d{14}/]
      filename = filename.dup.insert(filename.index('.'), version_string)
      FileUtils.mv(backup, filename)
      backup = filename
    end
    puts "Backup done."
    puts "Output file is in: #{backup}", ""

    exit(1) unless backuper.success
  end

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

  desc "restore", "Restore a Discourse backup"
  def restore(filename=nil)

    if !filename
      puts "You must provide a filename to restore. Did you mean one of the following?\n\n"

      Dir["public/backups/default/*"].each do |f|
        puts "script/discourse restore #{File.basename(f)}"
      end

      return
    end

    load_rails
    require "backup_restore/backup_restore"
    require "backup_restore/restorer"

    begin
      puts "Starting restore: #{filename}"
      restorer = BackupRestore::Restorer.new(Discourse.system_user.id, filename: filename)
      restorer.run
      puts 'Restore done.'
    rescue BackupRestore::FilenameMissingError
      puts '', 'The filename argument was missing.', ''
      usage
    rescue BackupRestore::RestoreDisabledError
      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

    exit(1) unless restorer.try(:success)
  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

  desc "export_category", "Export a category, all its topics, and all users who posted in those topics"
  def export_category(category_id, filename=nil)
    raise "Category id argument is missing!" unless category_id

    load_rails
    load_import_export
    ImportExport.export_category(category_id, filename)
    puts "", "Done", ""
  end

  desc "import_category", "Import a category, its topics and the users from the output of the export_category command"
  def import_category(filename)
    raise "File name argument missing!" unless filename

    puts "Starting import from #{filename}..."
    load_rails
    load_import_export
    ImportExport.import_category(filename)
    puts "", "Done", ""
  end

  desc "export_topics", "Export topics and all users who posted in that topic. Accepts multiple topic id's"
  def export_topics(*topic_ids)
    puts "Starting export of topics...", ""
    load_rails
    load_import_export
    ImportExport.export_topics(topic_ids)
    puts "", "Done", ""
  end

  desc "import_topics", "Import topics and their users from the output of the export_topic command"
  def import_topics(filename)
    raise "File name argument missing!" unless filename

    puts "Starting import from #{filename}..."
    load_rails
    load_import_export
    ImportExport.import_topics(filename)
    puts "", "Done", ""
  end

  private

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

  def load_import_export
    require File.expand_path(File.dirname(__FILE__) + "/../lib/import_export/import_export")
  end

  def do_remap(from, to, regex=false)
    sql = "SELECT table_name, column_name
FROM information_schema.columns
WHERE table_schema='public' and (data_type like 'char%' or data_type like 'text%') and is_updatable = 'YES'"

    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}"
      begin
        result = if regex
          cnn.async_exec("UPDATE #{table_name}
            SET #{column_name} = regexp_replace(#{column_name}, $1, $2, 'g')
            WHERE NOT #{column_name} IS NULL
              AND #{column_name} <> regexp_replace(#{column_name}, $1, $2, 'g')", [from, to])
        else
          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])
        end
        puts "#{result.cmd_tuples} rows affected!"
      rescue => ex
        puts "Error: #{ex}"
      end
    end
  end


end

DiscourseCLI.start(ARGV)