require 'net/ssh'
require 'pathname'
namespace :exec_commands do
  desc "Exec commands Script"
  task :exec_commands,[:site_construct_id,:commands,:type,:server_name] => :environment do |task,args|
    @type = args.type
    if !args.site_construct_id.blank?
      @site_construct = SiteConstruct.find(args.site_construct_id)
      site_server = SiteServer.where(:server_name=>@site_construct.server_type).first
      site_servers = [site_server]
    else
      @site_construct = nil
      site_servers = SiteServer.where(:server_name.in=>args.server_name.split("////")).to_a
    end
    if args.type == "exec_all"
      Multithread.where(:key=>'execing_commands').each{|thread| thread.destroy if (thread.status["status"] == "error" || thread.status["status"] == "finish")}
      @thread = Multithread.where(:key=>'execing_commands').first
    else
      @thread = nil
    end
    if @thread.nil?
      begin
        if @thread.nil? && args.type == "exec_all"
          @thread = Multithread.create(:key=>'execing_commands',:status=>{"infos"=>[],"status"=>"execing"})
        end
        site_servers.each do |site_server|
          ip = site_server.ip
          user = site_server.account
          password = site_server.password
          @password = password
          begin 
            Net::SSH.start(ip , user , password: password) do |ssh|
            end
          rescue Net::SSH::HostKeyMismatch
            system("ssh-keygen -f \"$HOME/.ssh/known_hosts\" -R #{ip}")
          rescue Errno::ENOTTY
            system("ssh-add \"$HOME/.ssh/id_rsa\"")
          end
          Net::SSH.start(ip , user , password: password) do |ssh|
            @site_construct.update!(:infos=>[]) rescue nil
            if args.type == 'close_site'
              exec_ssh_command_by_sudo_and_see_output(ssh,"chmod 777 #{@site_construct.path}/#{@site_construct.site_name} -R",false)
              exec_ssh_command_by_sudo_and_see_output(ssh,"bash -l -c 'kill -s TERM `fuser #{@site_construct.path}/#{@site_construct.site_name}/tmp/unicorn.sock`'",false)
              update_infos_for_exec("finish closing #{@site_construct.site_name}")
              @site_construct.update(:status =>"closed")
            elsif args.type == 'open_site'
              default_rails_env = 'development'
              enable_rails_env = ['development','production']
              rails_env = default_rails_env
              log_files = exec_ssh_command_by_sudo_and_see_output(ssh,"ls -t '#{@site_construct.path}/#{@site_construct.site_name}/log'",false).flat_map{|output| output.split(/(\r\n|\t|\n|\s+)/)}.select{|output| output.present? && /(\r\n|\t|\n|\s+)/.match(output).nil?} rescue []
              log_files.each do |log_file|
                if( enable_rails_env.include?(log_file.sub('.log','')) rescue false)
                  rails_env = log_file.sub('.log','')
                  break
                end
              end
              update_infos_for_exec("starting site to #{rails_env}")
              outputs = exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' chmod 777 #{@site_construct.path}/#{@site_construct.site_name} -R",false)
              output = exec_ssh_command_by_sudo_and_see_output(ssh,"bash -l -c 'cd #{@site_construct.path}/#{@site_construct.site_name}\nkill -s TERM `fuser tmp/unicorn.sock`\nsudo -p \"sudo password:\" kill -s TERM `sudo -p \"sudo password:\" fuser tmp/unicorn.sock`\nsudo -p \"sudo password:\" rm -f tmp/pids/unicorn.pid\nbundle exec unicorn_rails -c config/unicorn.rb -D -E #{rails_env}\n'",false)
              if output.include? "bundle install"
                update_infos_for_exec("not yet bundle install")
                outputs = exec_ssh_command_by_sudo_and_see_output(ssh,"bash -l -c 'cd #{@site_construct.path}/#{@site_construct.site_name};bundle install'")
                if outputs.join("\n").include? "Username for"
                  update_infos_for_exec("Cannot finish bundle install.")
                  update_infos_for_exec("This site include an private git project.")
                  @site_construct.update(:status =>"error")
                  break
                end
              end
              update_infos_for_exec("finish starting #{@site_construct.site_name}")
              @site_construct.update(:status =>"finish")
            elsif args.type == 'exec_all'
              sites = SiteConstruct.where(:server_type=>args.server_name).to_a
              commands = args.commands.split("////").select{|c| c != ""} rescue [args.commands]
              sites.each do |site_construct|
                @site_construct = site_construct
                @site_construct.update!(:infos=>[])
                exec_ssh_command_by_sudo(ssh,"chmod 777 #{@site_construct.path}/#{@site_construct.site_name} -R")
                commands.each do |command|
                  exec_ssh_command_by_sudo_and_see_output(ssh,"bash -l -c 'cd #{@site_construct.path}/#{@site_construct.site_name};#{command}'")
                end
              end
            else
              exec_ssh_command_by_sudo(ssh,"chmod 777 #{@site_construct.path}/#{@site_construct.site_name} -R")
              commands = args.commands.split("////").select{|c| c != ""} rescue [args.commands]
              commands.each do |command|
                exec_ssh_command_by_sudo_and_see_output(ssh,"bash -l -c 'cd #{@site_construct.path}/#{@site_construct.site_name};#{command}'")
              end
            end
          end
        end
        if !@thread.nil?
          @thread.update(:status=>@thread.status.merge({"status"=>"finish"}))
        end
      rescue => e
        if !@thread.nil?
          @thread.update(:status=>{"infos"=>@thread.status["infos"].push(e.message),"status"=>"error"})
          @thread.update(:status=>{"infos"=>@thread.status["infos"].push(e.backtrace.join("\n")),"status"=>"error"})
        end
        if !@site_construct.nil?
          @site_construct.update(:status =>"error",:infos=>@site_construct.infos.push("#{e.message}"))
          @site_construct.update(:status =>"error",:infos=>@site_construct.infos.push("#{e.backtrace.join("\n")}"))
        end
      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
  end
  def update_infos_for_exec(info,update_last=false)
    if update_last && !@site_construct.infos.empty?
      @site_construct.infos[-1] += info.to_s
    else
      @site_construct.infos = @site_construct.infos.push(info.to_s)
    end
    @site_construct.save!
    return @site_construct.infos
  end
  def update_thread_infos_for_exec(info,update_last=false)
    if update_last && !@thread.status["infos"].empty?
      @thread.status["infos"][-1] += info.to_s
    else
      @thread.status["infos"] = @thread.status["infos"].push(info.to_s)
    end
    @thread.save!
    return @thread.status["infos"]
  end
  def exec_ssh_command_and_see_output(session,command,update=true)
    outputs = []
    @flag = (@type == "exec_all")
    if update
      update_thread_infos_for_exec("execing #{command} on  on <a href='#{((@site_construct.port == "443") ? "https" : "http")}://#{@site_construct.domain_name}#{((@site_construct.port=="80" || @site_construct.port=="443") ? "" : (':'+@site_construct.port))}'>#{@site_construct.domain_name}</a>") if @flag
      update_infos_for_exec("execing #{command}")
    end
    session.open_channel do |channel|
      channel.request_pty do |channel, success|
        channel.exec(command) do |ch, success|
          abort "could not execute command: #{command}" unless success
          channel.on_data do |ch, data|
            print "#{data}"
            if data.include? "\n" || outputs.empty?
              outputs.push(data.to_s)
              if update
                update_thread_infos_for_exec(data) if @flag
                update_infos_for_exec(data)
              end
            else
              outputs[-1] += data.to_s rescue ""
              if update
                update_thread_infos_for_exec(data,true) if @flag
                update_infos_for_exec(data,true)
              end
            end
            if data.to_s.include?("sudo password:") || data.to_s.include?("Password:")
              channel.send_data "#{@password}\n"
            end
          end
          channel.on_close do |ch|
            if update
              update_thread_infos_for_exec("finish execing #{command} on <a href='#{((@site_construct.port == "443") ? "https" : "http")}://#{@site_construct.domain_name}#{((@site_construct.port=="80" || @site_construct.port=="443") ? "" : (':'+@site_construct.port))}'>#{@site_construct.domain_name}</a>") if @flag
              update_infos_for_exec("finish execing #{command}")
            end
          end
        end
      end
    end
    session.loop
    return outputs
  end
  def exec_ssh_command_by_sudo_and_see_output(session,command,update=true)
    outputs = exec_ssh_command_and_see_output(session,command,update)
    if outputs.join("\n").include?("Permission denied") || outputs.join("\n").include?("Operation not permitted")
      outputs = exec_ssh_command_and_see_output(session,"sudo -p 'sudo password:' #{command}",update)
    end
    return outputs
  end
end