require 'net/ssh'
require 'pathname'
namespace :create_site do
  desc "Copy Site from another site"
  task :copy_site,[:ip,:user,:password,:site_name,:domain_name,:port,:db_name,:path,:site_construct_id,:template_site_construct_id] => :environment do |task,args|
    @password = args.password
    template_site = SiteConstruct.find(args.template_site_construct_id)
    if args.site_construct_id.blank?
      @site_construct = SiteConstruct.new
      @site_construct.server_type = (SiteServer.where(:ip=>args.ip).first.server_name rescue args.ip)
      @site_construct.site_name = args.site_name
      @site_construct.domain_name = args.domain_name
      @site_construct.db_name = args.db_name
      @site_construct.port = args.port
      @site_construct.path = args.path
      @site_construct.school_name = args.site_name.split(/[-_]/)
      @site_construct.user_id = User.first.id.to_s
      @site_construct.save
    else
      @site_construct = SiteConstruct.find(args.site_construct_id)
    end
    begin
      @site_construct.update(:status=>"creating")
      @site_construct.update!(:infos=>[])
      begin 
        Net::SSH.start(args.ip , args.user , password: args.password) do |ssh|
        end
      rescue Net::SSH::HostKeyMismatch
        system("ssh-keygen -f \"$HOME/.ssh/known_hosts\" -R #{args.ip}")
      rescue Errno::ENOTTY
        system("ssh-add \"$HOME/.ssh/id_rsa\"")
      end
      Net::SSH.start(args.ip , args.user , password: args.password) do |ssh|
        update_infos("setting nginx for #{args.site_name}")
        nginx_setting_texts = ('upstream '+args.site_name+'_sock {\n'+
          '  server unix:'+args.path+'/'+args.site_name+'/tmp/unicorn.sock;\n'+
          '}\n'+
          'server {\n'+
          '  listen '+args.port+';\n\n'+
          '  root '+args.path+'/'+args.site_name+'/public;\n\n'+
          'server_name '+args.domain_name+';\n\n'+
          '  client_max_body_size 500m;\n\n'+
          '  location / {\n'+
          '    try_files \$uri \$uri/index.html \$uri.html @app;\n'+
          '  }\n\n'+
          '  location @app {\n'+
          '    proxy_redirect     off;\n'+
          '    proxy_set_header   X-Forwarded-For \$proxy_add_x_forwarded_for;\n'+
          '    proxy_set_header   Host  \$http_host;\n'+
          '    proxy_connect_timeout   360;\n'+
          'proxy_pass http://'+args.site_name+'_sock;\n'+
          '  }\n'+
          '}')
        exec_ssh_command_by_sudo_for_create(ssh,"touch /etc/nginx/orbit_sites/#{args.site_name}")
        exec_ssh_command_by_sudo_for_create(ssh,"sh -c \"echo '#{nginx_setting_texts}' >  /etc/nginx/orbit_sites/#{args.site_name}\"")
        update_infos("restarting nginx")
        exec_ssh_command_by_sudo_for_create(ssh,"sudo -p 'sudo password:' service nginx restart")
        update_infos("finish restarting nginx")
        exec_ssh_command_by_sudo_for_create(ssh,"mkdir -p #{args.path}")
        
        update_infos("copying site's files for #{args.site_name}")
        exec_ssh_command_for_create(ssh,"sudo -p 'sudo password:' apt-get install -y rsync")
        if @site_construct.server_type == template_site.server_type
            exec_ssh_command_for_create(ssh,"rsync -arv --delete --exclude={tmp/cache/,tmp/unicorn.sock,tmp/pids/*} #{template_site.path}/#{template_site.site_name}/ #{args.path}/#{args.site_name}/",true)
        else
            server = SiteServer.where(:server_name => template_site.server_type).first
            exec_ssh_command_for_create(ssh,"sudo -p 'sudo password:' apt-get install -y sshpass")
            outputs = exec_ssh_command_for_create(ssh,"sshpass -p \"#{server.password}\" rsync -arv --delete --exclude={tmp/cache/,tmp/unicorn.sock,tmp/pids/*} #{server.account}@#{server.ip}:#{template_site.path}/#{template_site.site_name}/ #{args.path}/#{args.site_name}/",true)
            if outputs.join("\n").include?("Host key verification failed")
                exec_ssh_command_by_sudo_for_create(session,"ssh-keygen -f \"$HOME/.ssh/known_hosts\" -R #{server.ip}")
                exec_ssh_command_by_sudo_for_create(session,"ssh-keyscan -H #{server.ip} >> ~/.ssh/known_hosts")
                exec_ssh_command_for_create(ssh,"sshpass -p \"#{server.password}\" rsync -arv --delete --exclude={tmp/cache/,tmp/unicorn.sock,tmp/pids/*} #{server.account}@#{server.ip}:#{template_site.path}/#{template_site.site_name}/ #{args.path}/#{args.site_name}/",true)
            end
        end
        update_infos("Finish copying site's files for #{args.site_name}!")

        exec_ssh_command_by_sudo_for_create(ssh,"sudo -p 'sudo password:' chown #{args.user}:#{args.user} #{args.path}/#{args.site_name} -R")
        exec_ssh_command_by_sudo_for_create(ssh,"sudo -p 'sudo password:' chmod 777 #{args.path}/#{args.site_name} -R")
        db_setting_text = ssh.exec!("cat #{args.path}/#{args.site_name}/config/mongoid.yml")
        update_infos("setting dbname to #{args.db_name}")
        exec_ssh_command_by_sudo_for_create(ssh,"sh -c \"echo '#{db_setting_text.gsub(template_site.db_name,args.db_name)}' > #{args.path}/#{args.site_name}/config/mongoid.yml\"",true)
        
        update_infos("copying db from #{template_site.db_name} to #{args.db_name}")
        if @site_construct.server_type == template_site.server_type
            exec_ssh_command_by_sudo_for_create(ssh,"mongodump -d #{template_site.db_name} -o #{args.path}/#{args.site_name}/dump_xxxx")
            exec_ssh_command_by_sudo_for_create(ssh,"mongorestore --drop -d #{args.db_name} #{args.path}/#{args.site_name}/dump_xxxx/#{template_site.db_name}")
            exec_ssh_command_by_sudo_for_create(ssh,"rm -rf #{args.path}/#{args.site_name}/dump_xxxx")
        else
            exec_ssh_command_by_sudo_for_create(ssh,"sshpass -p '#{server.password}' ssh #{server.account}@#{server.ip} 'mongodump -d #{template_site.db_name} -o #{template_site.path}/#{template_site.site_name}/dump_xxxx'")
            exec_ssh_command_for_create(ssh,"sshpass -p \"#{server.password}\" rsync -arv --delete #{server.account}@#{server.ip}:#{template_site.path}/#{template_site.site_name}/dump_xxxx/ #{args.path}/#{args.site_name}/dump_xxxx/")
            exec_ssh_command_by_sudo_for_create(ssh,"mongorestore --drop -d #{args.db_name} #{args.path}/#{args.site_name}/dump_xxxx/#{template_site.db_name}")
            exec_ssh_command_by_sudo_for_create(ssh,"rm -rf #{args.path}/#{args.site_name}/dump_xxxx")
            exec_ssh_command_by_sudo_for_create(ssh,"sshpass -p '#{server.password}' ssh #{server.account}@#{server.ip} 'rm -rf #{template_site.path}/#{template_site.site_name}/dump_xxxx'")
        end
        update_infos("Finish copying database!")

        update_infos("execing bundle install...")
        exec_ssh_command_by_sudo_for_create(ssh,"bash -l -c 'cd #{args.path}/#{args.site_name}\nbundle install'",true)
        exec_ssh_command_by_sudo_for_create(ssh,"bash -l -c 'cd #{args.path}/#{args.site_name}\nbundle install'")
        update_infos("finish execing bundle install")
        update_infos("starting #{args.site_name} web server to development")
        outputs = exec_ssh_command_by_sudo_for_create(ssh,"bash -l -c 'cd #{args.path}/#{args.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 development\n'")
        if outputs.include? "not writable"
            exec_ssh_command_by_sudo_for_create(ssh,"sudo -p 'sudo password:' chown #{args.user}:#{args.user} #{args.path}/#{args.site_name} -R")
            exec_ssh_command_by_sudo_for_create(ssh,"sudo -p 'sudo password:' chmod 777 #{args.path}/#{args.site_name} -R")
        end
        update_infos("finish creating #{args.site_name}")
        exec_ssh_command_by_sudo_for_create(ssh,"chmod 777 #{args.path}/#{args.site_name} -R")
        @site_construct.update(:status =>"finish")
        puts "finish creating #{args.site_name} on #{args.ip}"
      end
    rescue =>e
      @site_construct.update(:status =>"error",:infos=>@site_construct.infos.push("#{e}"))
    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_thread_infos_for_exec(info,update_last=false)
    if update_last
      @thread.status["infos"][-1] += info
    else
      @thread.status["infos"] = @thread.status["infos"].push(info)
    end
    @thread.save!
    return @thread.status["infos"]
  end
  def exec_ssh_command_for_create(session,command,update=false)
    outputs = []
    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|
            outputs.push(data)
            print "#{data}"
            if update
              if data.include? "\n"
                update_infos_for_exec(data)
              else
                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
        end
      end
    end
    session.loop
    return outputs
  end
  def exec_ssh_command_by_sudo_for_create(session,command,update=false)
    outputs = exec_ssh_command_for_create(session,command,update)
    if outputs.join("\n").include?("Permission denied") || outputs.join("\n").include?("Operation not permitted")
      outputs = exec_ssh_command_for_create(session,"sudo -p 'sudo password:' #{command}",update)
    end
    return outputs.join("\n")
  end
  def update_infos_for_exec(info,update_last=false)
    if update_last && !@site_construct.infos.empty?
      @site_construct.infos[-1] += info
    else
      @site_construct.infos = @site_construct.infos.push(info)
    end
    @site_construct.save!
    return @site_construct.infos
  end
  def update_infos(info)
    puts info
    @site_construct.infos = @site_construct.infos.push(info)
    @site_construct.save!
    return @site_construct.infos
  end
end