require_dependency "educode_sales/application_controller"

module EducodeSales
  class UploadFilesController < ApplicationController

    def index
      respond_to do |format|
        format.html do
        end
        format.json do
          @files = Attachment.where(description: "business", container_id:params[:business_id])
          if params[:sort].present? && params[:sort][:field]
            @files = @files.order("#{params[:sort][:field]} #{params[:sort][:order]}")
          else
            @files = @files.order("created_on desc")
          end
          @files = @files.page(params[:page]).per(params[:limit])
        end
      end
    end

    def create
      folder = edu_setting('attachment_folder')
        upload_file = params["file"]
        raise "未上传文件" unless upload_file
        save_path = File.join(folder)
        ext = file_ext(upload_file.original_filename)
        local_path, digest = file_save_to_local(save_path, upload_file.tempfile, ext)
        content_type = upload_file.content_type.presence || 'application/octet-stream'
        disk_filename = local_path[save_path.size + 1, local_path.size]
        @attachment = Attachment.where(disk_filename: disk_filename,
                                       author_id: @current_admin.id).first
        if @attachment.blank?
          @attachment = Attachment.new
          @attachment.filename = upload_file.original_filename
          @attachment.description = "business"
          @attachment.disk_filename = local_path[save_path.size + 1, local_path.size]
          @attachment.filesize = upload_file.tempfile.size
          @attachment.content_type = content_type
          @attachment.digest = digest
          @attachment.author_id = @current_admin.id
          @attachment.container_id = params[:business_id]
          @attachment.save!
        else
          logger.info "文件已存在，id = #{@attachment.id}, filename = #{@attachment.filename}"
        end
        render_success
    end

    def destroy
      folder = edu_setting('attachment_folder')
      file = Attachment.find(params[:id])
      file.destroy
      File.delete(folder.to_s + '/' + file.disk_filename) if FileTest::exist?(folder.to_s + '/' + file.disk_filename)
      render_success
    end

    def download
      folder = edu_setting('attachment_folder')
      file = Attachment.find_by_id(params[:id])
      raise "未找到文件" unless file
      send_file(folder.to_s + '/' + file.disk_filename, filename: file.title, stream: true, type: file.content_type.presence || 'application/octet-stream')
    end

    def edu_setting name
      EduSetting.get(name)
    end


    def file_ext(file_name)
      ext = ''
      exts = file_name.split(".")
      if exts.size > 1
        ext = ".#{exts.last}"
      end
      ext
    end

    def file_save_to_local(save_path, temp_file, ext)
      unless Dir.exists?(save_path)
        FileUtils.mkdir_p(save_path) ##不成功这里会抛异常
      end

      digest = md5_file(temp_file)
      digest = "#{digest}_#{(Time.now.to_f * 1000).to_i}"
      local_file_path = File.join(save_path, digest) + ext
      save_temp_file(temp_file, local_file_path)

      [local_file_path, digest]
    end


    def md5_file(temp_file)
      md5 = Digest::MD5.new
      temp_file.rewind
      while (buffer = temp_file.read(8192))
        md5.update(buffer)
      end
      md5.hexdigest
    end

    def save_temp_file(temp_file, save_file_path)
      File.open(save_file_path, 'wb') do |f|
        temp_file.rewind
        while (buffer = temp_file.read(8192))
          f.write(buffer)
        end
      end
    end

  end
end