# Redmine - project management software
# Copyright (C) 2006-2013  Jean-Philippe Lang
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

class AttachmentsController < ApplicationController
  layout "users_base"

  before_filter :find_project, :only => [:show, :download, :thumbnail, :destroy, :delete_homework]#, :except => [:upload, :autocomplete]
  before_filter :file_readable, :read_authorize, :only => [:show, :thumbnail]#Modified by young
  before_filter :delete_authorize, :only => [:destroy]
  before_filter :authorize_global, :only => [:upload]
  before_filter :authorize_attachment_download1, :only => [:download]
  before_filter :has_login
  #before_filter :login_without_softapplication, only: [:download]
  accept_api_auth :show, :download, :upload
  require 'iconv'
  include AttachmentsHelper
  include ApplicationHelper

  def show
    respond_to do |format|
      format.html {
        if @attachment.is_diff?
          @diff = File.new(@attachment.diskfile, "rb").read
          @diff_type = params[:type] || User.current.pref[:diff_type] || 'inline'
          @diff_type = 'inline' unless %w(inline sbs).include?(@diff_type)
          # Save diff type as user preference
          if User.current.logged? && @diff_type != User.current.pref[:diff_type]
            User.current.pref[:diff_type] = @diff_type
            User.current.preference.save
          end
          render :action => 'diff'
        elsif @attachment.is_text? && @attachment.filesize <= Setting.file_max_size_displayed.to_i.kilobyte
          @content = File.new(@attachment.diskfile, "rb").read
          # 编码为非 UTF-8先进行间接转码
          # 部分unicode编码不直接支持转为 UTF-8
          # modify by nwb
          if @content.encoding.name != 'UTF-8'
            @content = @content.force_encoding('GBK')
            @content = @content.encode('UTF-8')
          end
          render :action => 'file'
        else
          download
        end
      }
      format.api
    end
  rescue  Encoding::InvalidByteSequenceError => e
    render :action => 'file'
  end

  def pdf?(file)
    file.downcase.end_with?(".pdf")
  end

  def direct_download
    @attachment.increment_download
    send_file @attachment.diskfile, :filename => filename_for_content_disposition(@attachment.filename),
              :type => detect_content_type(@attachment),
              :disposition => 'attachment'    #inline can open in browser
  end

  def direct_download_history
    @attachment_history = AttachmentHistory.find(params[:id])
    @attachment_history.increment_download
    send_file @attachment_history.diskfile_history, :filename => filename_for_content_disposition(@attachment_history.filename),
              :type => detect_content_type(@attachment_history),
              :disposition => 'attachment'    #inline can open in browser
  end

  def download_history
    @attachment_history = AttachmentHistory.find(params[:id])
    candown = attachment_history_candown @attachment_history
    if candown || User.current.admin? || User.current.id == @attachment_history.author_id
      if stale?(:etag => @attachment_history.digest)
        if params[:preview] == 'true'
          convered_file = @attachment_history.diskfile_history
          #如果本身不是pdf文件，则先寻找是不是已转换化，如果没有则转化
          unless pdf?(convered_file)
            convered_file = File.join(Rails.root, "files", "convered_office", @attachment.disk_filename + ".pdf")
            unless File.exist?(convered_file)
              office = Trustie::Utils::Office.new(@attachment_history.diskfile)
              office.conver(convered_file)
            end
          end
          if File.exist?(convered_file) && pdf?(convered_file)
            send_file convered_file,  :type => 'application/pdf; charset=utf-8', :disposition => 'inline'
          else
            direct_download_history
          end
        else
          # 记录用户行为
          record_user_actions(params[:id])
          # 直接下载历史版本
          direct_download_history
        end
      end
    else
      render_403 :message => :notice_not_authorized
    end
  rescue => e
    redirect_to "http://" + (Setting.host_name.to_s) +"/file_not_found.html"
  end

  def record_user_actions id
    if params[:action] == "download_history"
      UserActions.create(:action_id => id, :action_type => "AttachmentHistory", :user_id => User.current.id) unless id.nil?
    elsif params[:action] == "download"
      UserActions.create(:action_id => id, :action_type => "Attachment", :user_id => User.current.id) unless id.nil?
    end
  end

  def download
    # modify by nwb
    # 下载添加权限设置
    candown = attachment_candown @attachment
    if candown || User.current.admin? || User.current.id == @attachment.author_id
      if stale?(:etag => @attachment.digest)
        if params[:preview] == 'true'
          convered_file = @attachment.diskfile
          #如果本身不是pdf文件，则先寻找是不是已转换化，如果没有则转化
          unless pdf?(convered_file)
            convered_file = File.join(Rails.root, "files", "convered_office", @attachment.disk_filename + ".pdf")
            unless File.exist?(convered_file)
              office = Trustie::Utils::Office.new(@attachment.diskfile)
              office.conver(convered_file)
            end
          end
          if File.exist?(convered_file) && pdf?(convered_file)
            send_file convered_file,  :type => 'application/pdf; charset=utf-8', :disposition => 'inline'
          else
            direct_download
          end
        else
          # 记录用户行为
          record_user_actions(params[:id])
          direct_download
        end
      end
    else
      render_403 :message => :notice_not_authorized
    end
  rescue => e
    redirect_to "http://" + (Setting.host_name.to_s) +"/file_not_found.html"
  end

  #更新资源文件类型
  def updateType
    @attachment = Attachment.find(params[:attachmentid])
    if  @attachment != nil
      @attachment.attachtype =  params[:newtype]
      @attachment.save
      render :text =>'success'
    else
      render :text=>'error'
    end
  end

  # 更新文件密级
  def updateFileDense
    @attachment = Attachment.find(params[:attachmentid])
    if  @attachment != nil
      filedense = params[:newtype].to_s
      # d =  Iconv.conv("unicodebig","utf-8",filedense)
      if filedense == "%E5%85%AC%E5%BC%80" #l(:field_is_public)
        @attachment.is_public = 1
      else
        @attachment.is_public = 0
      end
      @attachment.save
      @newfiledense = filedense
    end
    respond_to do |format|
      format.js
    end
  end

  def update_file_dense
    @attachment = Attachment.find(params[:attachmentid])
    if  @attachment != nil
      filedense = params[:newtype].to_s
      if filedense == "1"
        @attachment.is_public = 1
      else
        @attachment.is_public = 0
      end
      @attachment.save
      @newfiledense = filedense
    end
    respond_to do |format|
      format.js
    end
  end

  def thumbnail
    if @attachment.thumbnailable? && thumbnail = @attachment.thumbnail(:size => params[:size])
      if stale?(:etag => thumbnail)
        send_file thumbnail,
                  :filename => filename_for_content_disposition(@attachment.filename),
                  :type => detect_content_type(@attachment),
                  :disposition => 'inline'
      end
    else
      # No thumbnail for the attachment or thumbnail could not be created
      render :nothing => true, :status => 404
    end
  end


  def upload
    # Make sure that API users get used to set this content type
    # as it won't trigger Rails' automatic parsing of the request body for parameters
    unless request.content_type == 'application/octet-stream'
      render :nothing => true, :status => 406
      return
    end

    @attachment = Attachment.new(:file => request.raw_post)
    @attachment.author = User.current
    if !params[:project].nil?
      @attachment.container_type = 'Project'
      @attachment.container_id = params[:project].split("?")[0]
    end
    @attachment.filename = params[:filename].presence || Redmine::Utils.random_hex(16)
    saved = @attachment.save
    respond_to do |format|
      format.js
      format.api {
        if saved
          render :action => 'upload', :status => :created
        else
          render_validation_errors(@attachment)
        end
      }
    end
  end

  def upload_attachment_version
    @flag = false
    Attachment.transaction do
      @old_attachment = Attachment.find params[:old_attachment_id]
      #取出当前上传的文件
      @attachment = Attachment.find(params[:attachments ].first[1][:attachment_id])
      #将需要修改的记录保存到历史记录
      @history = AttachmentHistory.new
      @history.attributes = @old_attachment.attributes.dup.except("id")
      @history.attachment_id = params[:old_attachment_id]
      #需要更新版本号，需要拿到原来该文件最大的历史版本号
      @old_history = @old_attachment.attachment_histories.reorder('version desc').first
      @history.version =  @old_history.nil? ? 1 :  @old_history.version + 1
      @history.save  #历史记录保存完毕
      #将最新保存的记录 数据替换到 需要修改的文件记录
      @old_attachment.attributes = @attachment.attributes.dup.except("id","container_id","container_type","is_public","downloads", "quotes")
      # 如果附件描述被修改，则保存附件
      unless params[:description] == @attachment.description
        @old_attachment.description = params[:description]
      end
      @old_attachment.save
      #删除当前记录
      @attachment.delete
      @flag = true
    end

    respond_to do |format|
      format.js
    end
  end

  def destroy
    if @attachment.container.respond_to?(:init_journal)
      @attachment.container.init_journal(User.current)
    end
    if @attachment.container
      if @attachment.container_type == "Issue"
        @attachment.destroy
      else
        @attachment.container.attachments.delete(@attachment)
      end
    else
      @attachment.destroy
    end

    respond_to do |format|
      if !@attachment.container.nil? &&
          (@attachment.container.is_a?(Course) || ((@attachment.container.has_attribute?(:course) || @attachment.container.has_attribute?(:course_id) )  &&
              @attachment.container.course ) || ((@attachment.container.has_attribute?(:board) || @attachment.container.has_attribute?(:board_id)) &&
              @attachment.container.board && @attachment.container.board.course ) || @attachment.container.is_a?(StudentWorksScore) ||  @attachment.container.is_a?(HomeworkCommon) ||
              @attachment.container.is_a?(StudentWork))
        if @attachment.container.is_a?(News)
          format.html { redirect_to_referer_or news_path(@attachment.container) }
        elsif @attachment.container.is_a?(StudentWorksScore)
          @is_destroy = true unless params[:attachment_id] #根据ID删除页面对应的数据，js刷新页面
          format.js
        elsif @attachment.container.is_a?(HomeworkCommon)
          @is_destroy = true unless params[:attachment_id] #根据ID删除页面对应的数据，js刷新页面
          format.js
        elsif @attachment.container.is_a?(StudentWork)
          @is_destroy = true unless params[:attachment_id] #根据ID删除页面对应的数据，js刷新页面
          format.js
        elsif @attachment.container.is_a?(Message)
          format.html { redirect_to_referer_or new_board_message_path(@attachment.container) }
        elsif @attachment.container.is_a?(BlogComment)
          format.html { redirect_to_referer_or user_blog_blog_comment_path(:user_id=>@attachment.container.author.id,:blog_id=>@attachment.container.blog_id,:id=>@attachment.container.id)}
        elsif @course.nil?
          format.html { redirect_to_referer_or forum_memo_path(@attachment.container.forum, @attachment.container) }
        else
          format.html { redirect_to_referer_or course_path(@course) }
        end
      elsif !@attachment.container.nil? && @attachment.container.is_a?(Softapplication)
        format.html { redirect_to_referer_or softapplications_path(@attachment.container) }
      elsif !@attachment.container.nil? && @attachment.container.is_a?(Bid)
        format.html { redirect_to_referer_or respond_path(@attachment.container) }
      elsif !@attachment.container.nil? && @attachment.container.is_a?(PhoneAppVersion)
        format.html { redirect_to_referer_or mobile_version_path }
      elsif !@attachment.container.nil? && @attachment.container.is_a?(OrgSubfield)
        format.html {redirect_to_referer_or org_subfield_files_path(@attachment.container)}
      elsif !@attachment.container.nil? && @attachment.container.is_a?(OrgDocumentComment)
        format.html {redirect_to_referer_or org_document_comment_path(@attachment.container)}
      else
        if @project.nil?
          format.html { redirect_to_referer_or forum_memo_path(@attachment.container.forum, @attachment.container) }
        else
          format.html { redirect_to_referer_or project_path(@project) }
        end
      end

      format.js
    end
  end

  def delete_homework
    @bid = @attachment.container.bid
    # Make sure association callbacks are called
    container = @attachment.container
    @attachment.container.attachments.delete(@attachment)
    #if container.attachments.empty?
    #container.delete
    #end

    respond_to do |format|
      format.html { redirect_to_referer_or respond_path(@bid) }
      format.js
    end
  end

  #删除竞赛作品的附件
  def delete_softapplications
    @attachment = Attachment.find params[:id]
    @softapplication = @attachment.container if @attachment!=nil
    @attachment.container.attachments.delete(@attachment)  if @attachment!=nil
    respond_to do |format|
      format.html { redirect_to_referer_or edit_softapplication_path(@softapplication) }
      #format.js
    end
  end

  def autocomplete
    # modify by nwb
    if params[:project_id]
      @project = Project.find_by_id(params[:project_id])
    elsif params[:course_id]
      @course = Course.find_by_id(params[:course_id])
    end

    respond_to do |format|
      format.js
    end
  end

  def add_exist_file_to_project
    classname = params[:class_name]
    class_id  = params[:class_id]
    attachments = params[:attachment][:attach]

    obj = Object.const_get(classname).find_by_id(class_id)
    attachments.collect do |attach_id|
      ori = Attachment.find_by_id(attach_id)
      next if ori.blank?
      attach_copied_obj = ori.copy
      attach_copied_obj.tag_list.add(ori.tag_list) # tag关联
      attach_copied_obj.container = obj
      attach_copied_obj.created_on = Time.now
      attach_copied_obj.author_id = User.current.id
      if attach_copied_obj.attachtype == nil
        attach_copied_obj.attachtype = 1
      end
      @obj = obj
      @save_flag = attach_copied_obj.save
      @save_message = attach_copied_obj.errors.full_messages
    end

    respond_to do |format|
      format.js
    end
  rescue NoMethodError
    @save_flag = false
    @save_message = [] << l(:error_attachment_empty)
    respond_to do |format|
      format.js
    end
  end

  def add_exist_file_to_course
    class_id  = params[:class_id]
    attachments = params[:attachment][:attach]

    obj = Course.find_by_id(class_id)
    attachments.collect do |attach_id|
      ori = Attachment.find_by_id(attach_id)
      next if ori.blank?
      attach_copied_obj = ori.copy
      attach_copied_obj.tag_list.add(ori.tag_list) # tag关联
      attach_copied_obj.container = obj
      attach_copied_obj.created_on = Time.now
      attach_copied_obj.author_id = User.current.id
      if attach_copied_obj.attachtype == nil
        attach_copied_obj.attachtype = 4
      end
      @obj = obj
      @save_flag = attach_copied_obj.save
      @save_message = attach_copied_obj.errors.full_messages
    end

    respond_to do |format|
      format.js
    end
  rescue NoMethodError
    @save_flag = false
    @save_message = [] << l(:error_attachment_empty)
    respond_to do |format|
      format.js
    end
  end

  def add_exist_file_to_projects
    file = Attachment.find(params[:file_id])
    projects = params[:projects][:project]
    @message = ""
    projects.each do |project|
      c = Project.find(project);
      if project_contains_attachment?(c,file)
        if @message && @message == ""
          @message += l(:label_project_prompt) + c.name + l(:label_contain_resource) + file.filename + l(:label_quote_resource_failed)
          next
        else
          @message +=  "<br/>" + l(:label_project_prompt) + c.name + l(:label_contain_resource) + file.filename + l(:label_quote_resource_failed)
          next
        end
      end
      attach_copied_obj = file.copy
      attach_copied_obj.tag_list.add(file.tag_list) # tag关联
      attach_copied_obj.container = c
      attach_copied_obj.created_on = Time.now
      attach_copied_obj.author_id = User.current.id
      attach_copied_obj.copy_from = file.copy_from.nil? ? file.id : file.copy_from
      if attach_copied_obj.attachtype == nil
        attach_copied_obj.attachtype = 4
      end
      @obj = c
      @save_flag = attach_copied_obj.save
      @save_message = attach_copied_obj.errors.full_messages
      update_quotes attach_copied_obj
    end
    respond_to do |format|
      format.js
    end
  rescue NoMethodError
    @save_flag = false
    @save_message = [] << l(:label_project_empty_select)
    respond_to do |format|
      format.js
    end
  end

  def add_exist_file_to_courses
    file = Attachment.find(params[:file_id])
    courses = params[:courses][:course]
    @message = ""
    courses.each do |course|
      c = Course.find(course);
      if course_contains_attachment?(c,file)
        if @message && @message == ""
          @message += l(:label_course_prompt) + c.name + l(:label_contain_resource) + file.filename + l(:label_quote_resource_failed)
          next
        else
          @message +=  "<br/>" + l(:label_course_prompt) + c.name + l(:label_contain_resource) + file.filename + l(:label_quote_resource_failed)
          next
        end
      end
      attach_copied_obj = file.copy
      attach_copied_obj.tag_list.add(file.tag_list) # tag关联
      attach_copied_obj.container = c
      attach_copied_obj.created_on = Time.now
      attach_copied_obj.author_id = User.current.id
      attach_copied_obj.copy_from = file.copy_from.nil? ? file.id : file.copy_from
      if attach_copied_obj.attachtype == nil
        attach_copied_obj.attachtype = 4
      end
      @obj = c
      @save_flag = attach_copied_obj.save
      @save_message = attach_copied_obj.errors.full_messages
      update_quotes attach_copied_obj
    end
    respond_to do |format|
      format.js
    end
  rescue NoMethodError
    @save_flag = false
    @save_message = [] << l(:label_course_empty_select)
    respond_to do |format|
      format.js
    end
  end

  def add_exist_file_to_org_subfield
    file = Attachment.find(params[:file_id])
    org_subfields = params[:org_subfields][:org_subfield]
    @message = ""
    org_subfields.each do |org_subfield|
      s = OrgSubfield.find(org_subfield)
      if s.attachments.include?file
        if @message && @message == ""
          @message += l(:label_resource_subfield_prompt) + c.name + l(:label_contain_resource) + file.filename + l(:label_quote_resource_failed)
          next
        else
          @message +=  "<br/>" + l(:label_resource_subfield_prompt) + c.name + l(:label_contain_resource) + file.filename + l(:label_quote_resource_failed)
          next
        end
      end
      attach_copied_obj = file.copy
      attach_copied_obj.tag_list.add(file.tag_list) # tag关联
      attach_copied_obj.container = s
      attach_copied_obj.created_on = Time.now
      attach_copied_obj.author_id = User.current.id
      attach_copied_obj.copy_from = file.copy_from.nil? ? file.id : file.copy_from
      if attach_copied_obj.attachtype == nil
        attach_copied_obj.attachtype = 4
      end
      @obj = s
      @save_flag = attach_copied_obj.save
      @save_message = attach_copied_obj.errors.full_messages
      update_quotes attach_copied_obj
    end
    respond_to do |format|
      format.js
    end
  rescue NoMethodError
    @save_flag = false
    @save_message = [] << l(:label_resource_subfield_empty_select)
    respond_to do |format|
      format.js
    end
  end

  def update_quotes attachment
    if attachment.copy_from
      attachments = Attachment.find_by_sql("select * from attachments where copy_from = #{attachment.copy_from} or id =  #{attachment.copy_from}")
    else
      attachments = Attachment.find_by_sql("select * from attachments where copy_from = #{attachment.id} or id = #{attachment.copy_from}")
    end
    attachment.quotes = get_qute_number attachment
    attachment.save
    attachments.each do |att|
      att.quotes = attachment.quotes
      att.save
    end
  end

  #找到文件的所有的历史版本
  def attachment_versions
    @attachment = Attachment.find(params[:id])
    @attachment_histories = @attachment.attachment_histories
    respond_to do |format|
      format.js
    end
  end

  #找到文件的所有的历史版本及当前版本
  def attachment_history_download
    @attachment = Attachment.find(params[:id])
    @attachment_histories = @attachment.attachment_histories
    respond_to do |format|
      format.js
    end
  end

  private
  def find_project
    @attachment = Attachment.find(params[:id])
    # Show 404 if the filename in the url is wrong
    # modify by nwb
    raise ActiveRecord::RecordNotFound if params[:filename] && params[:filename] != @attachment.filename
    if @attachment.container_type == 'Course'
      @course = @attachment.course
    elsif  !@attachment.container.nil? && (@attachment.container.has_attribute?(:course) || @attachment.container.has_attribute?(:course_id)) && @attachment.container.course
      @course = @attachment.container.course
    elsif !@attachment.container.nil? && ((@attachment.container.has_attribute?(:board) || @attachment.container.has_attribute?(:board_id)) && @attachment.container.board &&
        @attachment.container.board.course)
      @course = @attachment.container.board.course
    else
      unless @attachment.container_type == 'Syllabus' || @attachment.container_type == 'Bid' ||  @attachment.container_type == 'Organization' || @attachment.container_type == 'HomeworkAttach' || @attachment.container_type == 'Memo' || @attachment.container_type == 'Softapplication' || @attachment.container_type == 'PhoneAppVersion' || @attachment.container_type == 'StudentWorksScore'|| @attachment.container_type == 'StudentWork'
        @project = @attachment.project
      end
    end
  rescue ActiveRecord::RecordNotFound
    render_404
  end

  # Checks that the file exists and is readable
  def file_readable
    if @attachment.readable?
      true
    else
      logger.error "Cannot send attachment, #{@attachment.diskfile} does not exist or is unreadable."
      render_404
    end
  end

  def read_authorize
    if @attachment.container_type == "HomeworkAttach" || @attachment.container_type == 'Bid'
      true
      #User.current.allowed_to?(:view_homework_attaches, @attachment.project) ? true : deny_access
    else
      @attachment.visible? ? true : deny_access
    end
  end

  def delete_authorize
    @attachment.deletable? ? true : deny_access
  end

  def detect_content_type(attachment)
    content_type = attachment.content_type
    if content_type.blank?
      content_type = Redmine::MimeType.of(attachment.filename)
    end
    content_type.to_s
  end

  def login_without_softapplication
    referer = request.headers['Referer']
    require_login unless referer =~ /softapplication/ || @attachment.container_type == "Memo"
  end

  def  renderTag
    @attachmentNew = Attachment.find(params[:attchmentId])
    respond_to do |format|
      format.js
    end
  end

  def has_login
    unless (@attachment && @attachment.container_type == "Organization").nil?
      unless (@attachment && @attachment.container_type == "PhoneAppVersion").nil?
        render_403 if  !User.current.logged? && !(@attachment.container_type == 'OrgSubfield' && @attachment.container.organization.allow_guest_download) && !(@attachment.container_type == 'OrgDocumentComment' && @attachment.container.organization.allow_guest_download)
      end
    end
  end
end