require 'net/ssh'
require 'pathname'
require 'fileutils'
require "resolv"
namespace :create_site do
  desc "Detect sites"
  task :detect_sites,[:detect_name] => :environment do |task,args|
    Multithread.where(:key=>'detect_sites').each{|thread| thread.destroy if (thread.status["status"] == "error" || thread.status["status"] == "finish")}
    Multithread.where(:key=>'detect_sites').destroy
    @thread = Multithread.where(:key=>'detect_sites').first
    @type = "exec_all"
    if @thread.nil?
      begin
        @thread = Multithread.create(:key=>'detect_sites',:status=>{"infos"=>[],"status"=>"detecting"})
        if( args.detect_name.nil? rescue true)
            site_servers = SiteServer.all.where(:active=>true).to_a
        else
            site_servers = SiteServer.where(:server_name=>args.detect_name).to_a
        end
        site_servers.each do |site_server|
          @site_server = site_server
          update_thread_infos("<span style='color: skyblue;'>"+@site_server.server_name+"</span>")
          @password = @site_server.password
          begin
            begin 
              Net::SSH.start(@site_server.ip , @site_server.account , password: @site_server.password) do |ssh|
              end
            rescue Net::SSH::HostKeyMismatch
              system("ssh-keygen -f \"$HOME/.ssh/known_hosts\" -R #{@site_server.ip}")
            rescue Errno::ENOTTY
              system("ssh-add \"$HOME/.ssh/id_rsa\"")
            rescue => e
              update_thread_infos(e.to_s)
              next
            end
            Net::SSH.start(@site_server.ip , @site_server.account , password: @site_server.password) do |ssh|
              certbot_path = exec_ssh_command_by_sudo_and_see_output(ssh,"bash -l -c 'which certbot certbot-auto'",false,true).strip.split("\n")[0]
              @site_server.has_certbot = certbot_path.present?
              @site_server.save
              if @site_server.has_certbot
                update_thread_infos("Checking certbot renew cronjob...")
                crontab_lines = exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' crontab -l",false,false)
                certbot_renew_command = crontab_lines.select{|l| l.include?("certbot") && l.include?("renew")}[0]
                unless certbot_renew_command
                  update_thread_infos("Add certbot renew cronjob!")
                  certbot_renew_command = "30 2 * * 1 #{certbot_path} renew --no-self-upgrade --post-hook 'sudo service nginx restart' > /var/log/le-renew.log"
                  update_thread_infos(certbot_renew_command)
                  exec_ssh_command_by_sudo_and_see_output(ssh,"CRON=\"#{certbot_renew_command}\" && (sudo -p 'sudo password:' crontab -l; echo \"\$CRON\" ) | sudo -p 'sudo password:' crontab -",false)
                end
              end
              nginx_include_dir = exec_command_by_user(ssh,'grep include /etc/nginx/nginx.conf | grep -v "\#\|include /etc/nginx/mime.types\|include /etc/nginx/conf.d/\*.conf\|/etc/nginx/sites-enabled/\*"')
              nginx_include_dir = nginx_include_dir.gsub(/include|;|\n/,'').strip
              domain_name = @site_server.domain_name#'serv.rulingcom.com'
              server_names = exec_command_by_user(ssh,"grep -H 'server_name' -r #{nginx_include_dir}")
              server_names_array = server_names.scan(/(.*):[ \t]*server_name[ \t]+(.*);/)
              server_names_array = server_names_array.group_by{|v| v[0]}

              server_names_array.each do |nginx_file, server_name_with_file|
                org_server_names_for_site = server_name_with_file.map{|v| v[1].split(/[ |\t]+/)}.flatten.uniq
                server_names_for_site = org_server_names_for_site - ["localhost","127.0.0.1"]
                server_name_list = []
                server_names_for_site.each do |server_name_for_site|
                  if !server_name_for_site.include?(domain_name)
                    if server_name_for_site.match(Regexp.union(Resolv::IPv4::Regex, Resolv::IPv6::Regex)).nil? #Not filter IP address
                      next if !`nslookup "#{server_name_for_site}"`.include?(@site_server.ip)
                    end
                  end
                  server_name_list << server_name_for_site
                end
                if server_name_list.blank?
                  tmp = org_server_names_for_site & ["localhost","127.0.0.1"]
                  if (tmp).length != 0
                    server_name_list = tmp + [@site_server.ip]
                  end
                end
                server_name = server_name_list.join(' ')
                nginx_file_content = exec_ssh_command_by_sudo_and_see_output(ssh,"cat #{nginx_file}",false,true)
                site_path = Pathname.new(exec_ssh_command_by_sudo_and_see_output(ssh,"echo `grep root #{nginx_file} | grep -v -e '#.*root'`",false,true).to_s.split("\n").first.to_s.strip.split(";").select{|s| s.present? && s.include?("root")}.first.split("root").last.to_s.strip).dirname.to_s rescue nil
                next if site_path.nil?
                if site_path.present? && exec_ssh_command_by_sudo(ssh,"ls #{site_path}").split.length != 0 &&  exec_ssh_command_by_sudo(ssh,"ls #{site_path}/Gemfile").include?("No such file or directory")
                  SiteConstruct.where(:server_type => @site_server.server_name , :domain_name=>server_name).destroy
                  next
                end
                path = Pathname.new(site_path).dirname.to_s
                site_name = Pathname.new(site_path).basename.to_s
                server_type = @site_server.server_name
                port = exec_ssh_command_by_sudo_and_see_output(ssh,"grep 'listen' #{nginx_file} | grep -v -e '#.*listen'",false).flat_map{|s| s.split(/(\r\n|\n)/)}.map{|s| s.match(/listen\s+(\d+)/)[1] rescue nil}.select{|s| s.present?}.uniq
                db_name = exec_ssh_command_by_sudo(ssh,"echo `cat #{site_path}/config/mongoid.yml | grep 'database'`").split("database:").last.strip
                db_name = site_name.gsub("-","_") if db_name.include?("No such file or directory")
                unicorn_sock_path = exec_ssh_command_by_sudo(ssh,"echo `grep 'server unix' #{nginx_file}  | grep -v -e '#.*server unix'`").strip.split("server unix").last.strip.split(":").last.strip rescue (site_path+"/tmp/unicorn.sock")
                if Pathname.new(path).basename.to_s == "orbit_sites" || Pathname.new(path).basename.to_s == "housing_sites" || Pathname.new(path).basename.to_s == "dev_sites" || Pathname.new(path).dirname.to_s == "/home"
                  school_name = nil
                  site_type = "Gravity"
                else
                  school_name = Pathname.new(path).basename.to_s
                  site_type = "School"
                end
                pid_infos = exec_ssh_command_by_sudo(ssh,"fuser #{unicorn_sock_path}").to_s.strip.gsub("\n","")
                if pid_infos.length != 0 && !pid_infos.include?("not exist") &&  !pid_infos.include?("No such file or directory")
                  status = "finish"
                else
                  bundle_show_info = exec_ssh_command_by_sudo(ssh,"bash -l -c 'cd #{site_path};bundle show'")
                  if bundle_show_info.include?("is not yet checked out") || bundle_show_info.include?("No such file or directory")
                    status = ""
                  else
                    status = "closed"
                  end
                end
                site_constructs = SiteConstruct.where(:server_type => server_type , :nginx_file=>nginx_file).to_a
                site_construct = site_constructs[0]
                Array(site_constructs[1..-1]).each do |s|
                  s.destroy
                end
                cert_ver_added_text = exec_command_by_user(ssh,"cat #{nginx_file}").scan(/[ \t]*location(?:(?!location.*{).)+{#add_by_site_module.*}/m)[0]
                update_thread_infos("Detect <a href='#{((port[0] == "443") ? "https" : "http")}://#{server_name}#{((port[0]=="80" || port[0]=="443") ? "" : (':'+port[0]))}'>#{server_name}</a>".html_safe) rescue nil
                if site_construct.nil?
                  site_construct = SiteConstruct.create(:server_type=>server_type,:site_name=>site_name,:domain_name=>server_name,:nginx_file=>nginx_file,:db_name=>db_name,:port=>port,:path=>path,:site_type=>site_type,:school_name=>school_name,:user_id=>User.first.id,:status=>status,:cert_ver_added_text=>cert_ver_added_text)
                else
                  site_construct.update(:server_type=>server_type,:site_name=>site_name,:domain_name=>server_name,:nginx_file=>nginx_file,:db_name=>db_name,:port=>port,:path=>path,:site_type=>site_type,:school_name=>school_name,:user_id=>User.first.id,:status=>status,:cert_ver_added_text=>cert_ver_added_text)
                end
                default_rails_env = 'development'
                enable_rails_env = ['development','production']
                rails_env = default_rails_env
                cmd_output = exec_ssh_command_by_sudo_and_see_output(ssh,"ps -o args= -p `cat #{site_construct.path}/#{site_construct.site_name}/tmp/pids/unicorn.pid`",false) rescue []
                enable_rails_env.each do |env|
                  if( cmd_output[0].include?(env) rescue false)
                    rails_env = env
                    break
                  elsif( cmd_output[0].include?("No such file or directory") rescue false)
                    site_construct.update(:status => "closed")
                    break
                  end
                end
                site_construct.update(:rails_env => rails_env)
                crt_file_path = nginx_file_content.match(/(?<=!#|^)\s*ssl_certificate\s+(.*)/)[1].split(';').first rescue ''
                private_key_path = nginx_file_content.match(/(?<=!#|^)\s*ssl_certificate_key\s+(.*)/)[1].split(';').first rescue ''
                site_cert = nil
                if crt_file_path.present? || private_key_path.present?
                  site_cert = site_construct.site_cert
                  if site_cert.nil?
                    site_cert = SiteCert.where(:source_paths=>[crt_file_path,private_key_path]).first
                    site_cert = SiteCert.new if site_cert.nil?
                  end
                  if true #site_cert.source_paths.count == 0
                    site_cert["cert_file"] = File.basename(crt_file_path)
                    cert_file_store_path = site_cert.cert_file.file.file
                    crt_file_content = exec_ssh_command_by_sudo_and_see_output(ssh,"cat #{crt_file_path}",false).select{|s| s.present?}.join("\n").strip.split(/(\r\n|\n)/).select{|s| s.present?}.join("\n")
                    FileUtils.mkdir_p(File.dirname(cert_file_store_path)) unless Dir.exist?(File.dirname(cert_file_store_path))
                    File.open(cert_file_store_path,'w+'){|f| f.write(crt_file_content)}
                    site_cert["private_key"] = File.basename(private_key_path)
                    private_key_store_path = site_cert.private_key.file.file
                    private_key_content = exec_ssh_command_by_sudo_and_see_output(ssh,"cat #{private_key_path}",false).select{|s| s.present?}.join("\n").strip.split(/(\r\n|\n)/).select{|s| s.present?}.join("\n")
                    FileUtils.mkdir_p(File.dirname(private_key_store_path)) unless Dir.exist?(File.dirname(private_key_store_path))
                    File.open(private_key_store_path,'w+'){|f| f.write(private_key_content)}
                    site_cert.source_paths = [crt_file_path,private_key_path]
                    site_cert.is_certbot = private_key_path.include?("letsencrypt")
                    site_cert.save
                    site_construct.update(:site_cert=>site_cert)
                  end
                  if nginx_file_content.match(/\s*return\s+30[12]\s+https:\/\/\$host\$request_uri\s*;/)
                    site_construct.update(:redirect_to_https => true)
                  else
                    site_construct.update(:redirect_to_https => false)
                  end
                end
              end
              update_thread_infos("Detecting Backup Setting on #{site_server.server_name}...")
              crontab_lines = exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' crontab -l;crontab -l",false,false)
              file_backups = crontab_lines.select{|s| s.match(/^\s*[^\s#]/) && s.include?('rsnapshot')}.map{|s| SiteServerFileBackup.read_from_crontab_line(s)}.compact
              rsnapshot_confs_path = ([SiteServerFileBackup::DefaultConf] + file_backups.map{|time, rsnapshot_conf_path, period| rsnapshot_conf_path}).uniq
              retain_settings = {}
              backup_dir_info = {}
              snapshot_root_info = {}
              rsnapshot_confs_path.each do |rsnapshot_conf_path|
                backup_retain_lines = exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' grep -E '^\\s*retain\\s+' #{rsnapshot_conf_path}",false,false).map{|s| s.strip}.select{|s| s.present?}
                backup_retain_lines = backup_retain_lines
                next if backup_retain_lines.blank?
                part_retain_settings = backup_retain_lines.map{|s| (s.strip.split(/\s+/)[1..2] rescue nil)}.compact.to_h
                retain_settings[rsnapshot_conf_path] = part_retain_settings

                backup_dir_subinfo = exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' grep -E '^\s*backup' #{rsnapshot_conf_path}",false,false).map{|s| s.strip}.select{|s| s.present?} # ex: ["backup\t/home/rulingcom\tlocalhost/"]
                backup_dir_info[rsnapshot_conf_path] = backup_dir_subinfo.map{|s| s.strip.split(/\s+/)[1..2]}

                snapshot_root_subinfo = exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' grep -E '^\s*snapshot_root' #{rsnapshot_conf_path}",false,false).map{|s| s.strip}.select{|s| s.present?}.last # ex: "snapshot_root\t/home/backup/orbit"
                snapshot_root_info[rsnapshot_conf_path] = snapshot_root_subinfo.strip.split(/\s+/)[1] rescue nil #only single snapshot_root in a conf
              end
              file_backups_group = file_backups.group_by{|time, rsnapshot_conf_path, period| rsnapshot_conf_path}
              file_backup_ids = []
              retain_settings.each do |rsnapshot_conf_path, part_retain_settings|
                path = snapshot_root_info[rsnapshot_conf_path]
                if path.nil?
                  path = '/home/backup/orbit'
                end
                backup_dir_subinfo = backup_dir_info[rsnapshot_conf_path]
                tmp = file_backups_group[rsnapshot_conf_path]
                unused_period = part_retain_settings.map{|period_text, retain_count| SiteServerFileBackup::PeriodsTypes.index(period_text).to_i} - tmp.map{|time, rsnapshot_conf_path, period| period}
                unused_retain_settings = unused_period.map{|period| [period, part_retain_settings[SiteServerFileBackup::PeriodsTypes[period]]]}
                backup_dir_subinfo.each do |backup_dir, backup_prefix|
                  unused_retain_settings.each do |period, retain_count|
                    file_backup_data = {:site_server=>@site_server, :disable=>true, :period=>period, :path=>path, :retain_count=>retain_count, :rsnapshot_conf_path=>rsnapshot_conf_path, :backup_dir=>backup_dir, :backup_prefix=>backup_prefix}
                    file_backup = SiteServerFileBackup.where(file_backup_data.except(:disable)).first
                    if file_backup.nil?
                      file_backup = SiteServerFileBackup.create(file_backup_data)
                    else
                      file_backup.update_attributes(file_backup_data)
                    end
                    file_backup_ids << file_backup.id
                  end
                  tmp.each do |time, rsnapshot_conf_path, period|
                    retain_count = part_retain_settings[SiteServerFileBackup::PeriodsTypes[period]]
                    if retain_count
                      file_backup_data = {:site_server=>@site_server, :disable=>false, :backup_time=>time, :path=>path, :period=>period, :retain_count=>retain_count, :rsnapshot_conf_path=>rsnapshot_conf_path, :backup_dir=>backup_dir, :backup_prefix=>backup_prefix}
                      file_backup = SiteServerFileBackup.where(file_backup_data.except(:disable)).first
                      if file_backup.nil?
                        file_backup = SiteServerFileBackup.create(file_backup_data)
                      else
                        file_backup.update_attributes(file_backup_data)
                      end
                      file_backup_ids << file_backup.id
                    end
                  end
                end
              end
              SiteServerFileBackup.where(:id.in=>file_backup_ids).update_all(:need_rewrite=>false)
              db_backup_ids = []
              db_backup_infos = crontab_lines.select{|s| s.match(/^\s*[^\s#]/) && s.include?('mongodump')}.map{|s| SiteServerDbBackup.read_from_crontab_line(s, crontab_lines)}.compact
              db_backup_infos.each do |backup_time, path, period, retain_count|
                next if backup_time.nil?
                db_backup_data = {:site_server=>@site_server, :disable=>false, :period=>period, :path=>path, :backup_time=>backup_time, :retain_count=>retain_count}
                db_backup = SiteServerDbBackup.where(db_backup_data.except(:disable)).first
                if db_backup.nil?
                  db_backup = SiteServerDbBackup.create(db_backup_data)
                else
                  db_backup.update_attributes(db_backup_data)
                end
                db_backup_ids << db_backup.id
              end
              SiteServerDbBackup.where(:id.in=>db_backup_ids).update_all(:need_rewrite=>false)
              update_thread_infos("Finish detecting Backup Setting on #{site_server.server_name}!")
            end
          end
        end
        SiteConstruct.where(:domain_name.in => [nil,'','localhost','127.0.0.1']).destroy
        @thread.update(:status=>@thread.status.merge({"status"=>"finish"}))
      rescue => e
        puts [e,e.backtrace]
        @thread.update(:status=>{"infos"=>@thread.status["infos"].push(e.to_s),"status"=>"error"})
      end
    end
  end
  def exec_ssh_command_by_sudo(session,command)
    output = session.exec!("echo '#{@password}' | sudo -S #{command}")
    # output = session.exec!("echo '#{@password}' | sudo -S -s #{command}")
    if output.include?("sudo:") && output.include?("command not found")
      output = session.exec!(command)
    end
    return output.encode!("UTF-8", :invalid => :replace, :undef => :replace, :replace => '')
  end
  def update_thread_infos(info)
    puts info
    @thread.status["infos"] = @thread.status["infos"].push(info)
    @thread.save!
    return @thread.status["infos"]
  end
end