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,:only_copy_installed_module] => :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.gsub(" ","")
      @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 = @site_construct.generate_nginx_text
        exec_ssh_command_by_sudo_for_create(ssh,"touch /etc/nginx/orbit_sites/#{@site_construct.get_site_name}")
        exec_ssh_command_by_sudo_for_create(ssh,"sh -c \"echo '#{nginx_setting_texts}' >  /etc/nginx/orbit_sites/#{@site_construct.get_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")
        extra_exclude_path = ""
        if args.only_copy_installed_module == true || args.only_copy_installed_module == "true"
          extra_exclude_path = ",public/uploads/"
        end
        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/*#{extra_exclude_path}} #{template_site.path}/#{template_site.get_site_name}/ #{args.path}/#{@site_construct.get_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/*#{extra_exclude_path}} #{server.account}@#{server.ip}:#{template_site.path}/#{template_site.get_site_name}/ #{args.path}/#{@site_construct.get_site_name}/",true)
            if outputs.join("\n").include?("Host key verification failed")
                exec_ssh_command_by_sudo_for_create(ssh,"ssh-keygen -f \"$HOME/.ssh/known_hosts\" -R #{server.ip}")
                exec_ssh_command_by_sudo_for_create(ssh,"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/*#{extra_exclude_path}} #{server.account}@#{server.ip}:#{template_site.path}/#{template_site.get_site_name}/ #{args.path}/#{@site_construct.get_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}/#{@site_construct.get_site_name} -R")
        exec_ssh_command_by_sudo_for_create(ssh,"sudo -p 'sudo password:' chmod 777 #{args.path}/#{@site_construct.get_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}/#{@site_construct.get_site_name}/config/mongoid.yml\"",true)
        unless args.only_copy_installed_module == true || args.only_copy_installed_module == "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}/#{@site_construct.get_site_name}/dump_xxxx")
              exec_ssh_command_by_sudo_for_create(ssh,"mongorestore --drop -d #{args.db_name} #{args.path}/#{@site_construct.get_site_name}/dump_xxxx/#{template_site.db_name}")
              exec_ssh_command_by_sudo_for_create(ssh,"rm -rf #{args.path}/#{@site_construct.get_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.get_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}/#{@site_construct.get_site_name}/dump_xxxx/#{template_site.db_name}")
              exec_ssh_command_by_sudo_for_create(ssh,"rm -rf #{args.path}/#{@site_construct.get_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.get_site_name}/dump_xxxx'")
          end
          update_infos("Finish copying database!")
        end
        update_infos("Checking extensions!")
        extensions = ["downloaded_extensions.rb","built_in_extensions.rb"]
        extensions.each do |extension_file|
            outputs = exec_ssh_command_by_sudo_for_create(ssh,"cat #{args.path}/#{@site_construct.get_site_name}/#{extension_file}")
            next if outputs.blank?
            if !outputs.include?("No such file or directory")
                read_lines = outputs.split("\n").map{|l| l.split('#').first}
                include_path_lines = read_lines.select{|l| (l.include?("path") rescue false)}
                include_path_lines.each do |line|
                    path = line.split(/[:>]/).last.gsub(/[\'\"]/,"").strip
                    absolute_path = (path[0] == "/") ? path : ("#{template_site.path}/#{template_site.get_site_name}/#{path}")
                    absolute_path = (absolute_path[-1] == "/") ? absolute_path : (absolute_path + "/")
                    if @site_construct.server_type == template_site.server_type
                        exec_ssh_command_for_create(ssh,"rsync -arv --delete #{absolute_path} #{args.path}/#{args.site_name}/#{Pathname.new(absolute_path).basename}/")
                    else
                        server = SiteServer.where(:server_name => template_site.server_type).first
                        exec_ssh_command_for_create(ssh,"sshpass -p \"#{server.password}\" rsync -arv --delete #{server.account}@#{server.ip}:#{absolute_path} #{args.path}/#{args.site_name}/#{Pathname.new(absolute_path).basename}/")
                    end
                    outputs = outputs.gsub(path,"#{args.path}/#{args.site_name}/#{Pathname.new(absolute_path).basename}/")
                end
                if include_path_lines.count != 0
                    exec_ssh_command_by_sudo_for_create(ssh,"sh -c \"echo '#{outputs.gsub("\"","\\\"").gsub("'","\\\"")}' > #{args.path}/#{@site_construct.get_site_name}/#{extension_file}\"")
                end
            end
        end
        update_infos("Finish checking extensions!")

        update_infos("execing bundle install...")
        exec_ssh_command_by_sudo_for_create(ssh,"bash -l -c 'cd #{args.path}/#{@site_construct.get_site_name}\nbundle install'",true)
        exec_ssh_command_by_sudo_for_create(ssh,"bash -l -c 'cd #{args.path}/#{@site_construct.get_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}/#{@site_construct.get_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" rescue false)
            exec_ssh_command_by_sudo_for_create(ssh,"sudo -p 'sudo password:' chown #{args.user}:#{args.user} #{args.path}/#{@site_construct.get_site_name} -R")
            exec_ssh_command_by_sudo_for_create(ssh,"sudo -p 'sudo password:' chmod 777 #{args.path}/#{@site_construct.get_site_name} -R")
        end
        update_infos("finish creating #{args.site_name}")
        exec_ssh_command_by_sudo_for_create(ssh,"chmod 777 #{args.path}/#{@site_construct.get_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