# 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.

require "digest/md5"
require "fileutils"
require 'elasticsearch/model'
class Attachment < ActiveRecord::Base
  belongs_to :container, :polymorphic => true
  belongs_to :project, foreign_key: 'container_id', conditions: "attachments.container_type = 'Project'"
  belongs_to :shixun, foreign_key: 'container_id', conditions: "attachments.container_type = 'Shixun'"
  belongs_to :course, foreign_key: 'container_id', conditions: "attachments.container_type = 'Course'"
  belongs_to :challenge, foreign_key: 'container_id', conditions: "attachments.container_type = 'Challenge'"
  belongs_to :org_subfield, foreign_key: 'container_id', conditions: "attachements.container_type = 'OrgSubfield'"
  belongs_to :organization, foreign_key: 'container_id', conditions: "attachements.container_type = 'Organization'"
  belongs_to :syllabus, foreign_key: 'container_id', conditions: "attachements.container_type = 'Syllabus'"
  belongs_to :softapplication, foreign_key: 'container_id', conditions: "attachments.container_type = 'Softapplication'"
  belongs_to :author, :class_name => "User", :foreign_key => "author_id"
  belongs_to :attachmentstype,  :foreign_key => "attachtype",:primary_key => "id"
  belongs_to :resource_bank
  belongs_to :inform, foreign_key: 'container_id', conditions: "attachments.container_type = 'Inform'"
  belongs_to :competition_module_md_content, foreign_key: 'container_id', conditions: "attachments.container_type = 'CompetitionModuleMdContent'"
  belongs_to :memo, foreign_key: 'container_id', conditions: "attachments.container_type = 'Memo'"
  belongs_to :career, foreign_key: 'container_id', conditions: "attachments.container_type = 'Career'"
  belongs_to :school, foreign_key: 'container_id', conditions: "attachments.container_type = 'School'"
  belongs_to :ec_template, foreign_key: 'container_id', conditions: "attachments.container_type = 'EcTemplate'"

  # 被ForgeActivity虚拟关联
  has_many :forge_acts, :class_name => 'ForgeActivity',:as =>:forge_act ,:dependent => :destroy
  has_many :forwards, :as => :from, :dependent => :destroy
  # 课程动态
  has_many :course_acts, :class_name => 'CourseActivity',:as =>:course_act ,:dependent => :destroy
  # end
  include UserScoreHelper
  has_many :attachment_histories, :dependent => :destroy
  has_many :apply_resources, :dependent => :destroy
  has_many :attachment_group_settings, :dependent => :destroy

  validates :filename, presence: true, length: {maximum: 254}
  validates :author, presence: true
  validates :disk_filename, length: {maximum: 254}
  # validates :description, length: {maximum: 254}
  validate :validate_max_file_size

  #elasticsearch
  include Elasticsearch::Model
  include ApplicationHelper
  #elasticsearch kaminari init
  Kaminari::Hooks.init
  Elasticsearch::Model::Response::Response.__send__ :include, Elasticsearch::Model::Response::Pagination::Kaminari
  settings index: { number_of_shards: 5 } do
    mappings dynamic: 'false' do
      indexes :filename, analyzer: 'smartcn',index_options: 'offsets'
      indexes :downloads, index:"not_analyzed",index_options: 'offsets'
    end
  end


  acts_as_taggable
  acts_as_event :title => :filename,
                :url => Proc.new {|o| {:controller => 'attachments', :action => 'download', :id => o.id, :filename => o.filename}}

  #课程资源文件
  acts_as_activity_provider :type => 'course_files',
                            :is_public => 'attachments.is_public',
                            :permission => :view_files,
                            :author_key => :author_id,
                            :find_options => {:select => "#{Attachment.table_name}.*",
                                              :joins => "LEFT JOIN #{Course.table_name}  ON ( #{Attachment.table_name}.container_type='Course' AND #{Attachment.table_name}.container_id = #{Course.table_name}.id )"}

  acts_as_activity_provider :type => 'files',
                            :is_public => 'attachments.is_public',
                            :permission => :view_files,
                            :author_key => :author_id,
                            :find_options => { :select => "#{Attachment.table_name}.*",
                                              :joins => "LEFT JOIN #{Version.table_name} ON #{Attachment.table_name}.container_type='Version' AND #{Version.table_name}.id = #{Attachment.table_name}.container_id " +
                                                        "LEFT JOIN #{Project.table_name} ON #{Version.table_name}.project_id = #{Project.table_name}.id OR ( #{Attachment.table_name}.container_type='Project' AND #{Attachment.table_name}.container_id = #{Project.table_name}.id )"}

  acts_as_activity_provider :type => 'documents',
                            :is_public => 'documents.is_public',
                            :permission => :view_documents,
                            :author_key => :author_id,
                            :find_options => {:select => "#{Attachment.table_name}.*",
                                              :joins => "LEFT JOIN #{Document.table_name} ON #{Attachment.table_name}.container_type='Document' AND #{Document.table_name}.id = #{Attachment.table_name}.container_id " +
                                                        "LEFT JOIN #{Project.table_name} ON #{Document.table_name}.project_id = #{Project.table_name}.id"}

  cattr_accessor :storage_path
  @@storage_path = Redmine::Configuration['attachments_storage_path'] || File.join(Rails.root, "files")

  cattr_accessor :thumbnails_storage_path
  @@thumbnails_storage_path = File.join(Rails.root, "tmp", "thumbnails")

  before_save :files_to_final_location
  after_save :act_as_course_activity
  after_create :office_conver, :be_user_score
  after_update :office_conver, :be_user_score
  after_destroy :delete_from_disk,:down_user_score, :decrease_attchments_count, :down_course_score

  # add by nwb
  # 获取所有可公开的资源文件列表
  scope :public_attachments, lambda {
    #joins(Project.table_name).where("container_type = 'Project' and ")
    joins("LEFT JOIN #{Project.table_name} ON #{Attachment.table_name}.container_type='Project' AND #{Project.table_name}.id = #{Attachment.table_name}.container_id and #{Project.table_name}.is_public=1 " +
              " LEFT JOIN #{Document.table_name} ON #{Attachment.table_name}.container_type='Project' AND #{Document.table_name}.project_id in "+self.public_project_id +
              " LEFT JOIN #{Issue.table_name} ON #{Attachment.table_name}.container_type='Project' AND #{Issue.table_name}.project_id in "+self.public_project_id +
              " LEFT JOIN #{Version.table_name} ON #{Attachment.table_name}.container_type='Project' AND #{Version.table_name}.project_id in "+self.public_project_id +
              " LEFT JOIN #{WikiPage.table_name} ON #{Attachment.table_name}.container_type='WikiPage' AND #{WikiPage.table_name}.parent_id in "+self.public_wiki_id +
              " LEFT JOIN #{Message.table_name} ON #{Attachment.table_name}.container_type='Message' AND #{Message.table_name}.parent_id in "+self.public_board_id +
              " LEFT JOIN #{Course.table_name} ON #{Attachment.table_name}.container_type='Course' AND #{Course.table_name}.is_public=1 " +
              " LEFT JOIN #{News.table_name} ON #{Attachment.table_name}.container_type='News' AND (#{News.table_name}.project_id in "+self.public_project_id + " OR #{News.table_name}.course_id in " + self.public_course_id + ")" +
              " LEFT JOIN #{HomeworkAttach.table_name} ON #{Attachment.table_name}.container_type='HomeworkAttach' AND #{HomeworkAttach.table_name}.bid_id in "+self.public_bid_id)
  }
  scope :indexable,lambda { where('is_public = 1 and ((container_type in ("Principal")) ' +
                                      'or (container_type = "Course" and container_id in( SELECT `courses`.id FROM `courses` WHERE (courses.status <> 9 AND courses.is_public = 1)) )'+
                                      'or (container_type = "Project" and container_id in(SELECT `projects`.id FROM `projects` WHERE (projects.status <> 9 AND projects.is_public = 1) ))' +')')} #用于elastic建索引的scope
  def self.search(query)
    __elasticsearch__.search(
        {
            query: {
                multi_match: {
                    query: query,
                    type:"most_fields",
                    operator: "or",
                    fields: ['filename']
                }
            },
            sort:{
                _score:{order:"desc"},
                downloads: {order:"desc"}

            },
            highlight: {
                pre_tags: ['<span class="c_red">'],
                post_tags: ['</span>'],
                fields: {
                    filename: {}
                }
            }
        }
    )
  end

  def get_apply_resource_status attachment_id, author_id
    status = ApplyResource.where("attachment_id =? and user_id =?", attachment_id, author_id).first.try(:status)
    status == 2 
  end

  # add by nwb
  # 公开的项目id列表
  def self.public_project_id
    idlist = "("
    projects=Project.all_public
    count = projects.count
    for i in 0...count
      project = projects[i]
      idlist+="'" + project.id.to_s + "'"
      if i != count-1
        idlist+=","
      end
    end
    idlist += ")"
    idlist
  end

  # add by nwb
  # 公开的课程id列表
  def self.public_course_id
    idlist = "("
    courses=Course.all_public
    count = courses.count
    for i in 0...count
      course = courses[i]
      idlist+="'" + course.id.to_s + "'"
      if i != count-1
        idlist = idlist + ","
      end
    end
    idlist += ")"
    idlist
  end

  # add by nwb
  # 公开的wiki id列表
  def self.public_wiki_id
    idlist = "("
    wikis=Wiki.where("project_id in " + public_project_id)
    count = wikis.count
    for i in 0...count
      wiki = wikis[i]
      idlist+="'" + wiki.id.to_s + "'"
      if i != count-1
        idlist = idlist + ","
      end
    end
    idlist += ")"
    idlist
  end

  # add by nwb
  # 公开的board id列表
  def self.public_board_id
    idlist = "("
    boards=Board.where("project_id in " + public_project_id + " or course_id in " + public_course_id)
    count = boards.count
    for i in 0...count
      board = boards[i]
      idlist+="'" + board.id.to_s + "'"
      if i != count-1
        idlist = idlist + ","
      end
    end
    idlist += ")"
    idlist
  end

  # add by nwb
  # 公开的bid id列表
  def self.public_bid_id
    idlist = "("
    bids=Bid.where("reward_type=3")
    count = bids.count
    for i in 0...count
      bid = bids[i]
      idlist+="'" + bid.id.to_s + "'"
      if i != count-1
        idlist = idlist + ","
      end
    end
    idlist += ")"
    idlist
  end

  # Returns an unsaved copy of the attachment
  def copy(attributes=nil)
    copy = self.class.new
    copy.attributes = self.attributes.dup.except("id", "downloads")
    copy.attributes = attributes if attributes
    copy
  end

  #获取资源的后缀类型
  def suffix_type
    childArr = self.filename.split('.')
    suffix = '*'
    if childArr.length > 1
      suffix = childArr[childArr.length-1]
    end
    suffix
  end

  #获取用来显示的后缀名称
  def show_suffix_type
    suffix = 'other'
    temp = self.suffix_type.downcase
    if self.attachmentstype && self.attachmentstype.suffixArr.include?(temp)
      suffix = temp
    end
    suffix
  end

  # 文件密级的字符描述
  def file_dense_str
    if self.is_public == 1
      dense = l(:field_is_public)
    else
      dense =  l(:field_is_private)
    end
    dense
  end

  # 文件可设置的密级列表
  def file_dense_list
    denselist = [l(:field_is_public),l(:field_is_private)]
  end

  def suffixArr
    @@SuffixArr
  end

  def validate_max_file_size
    max_file_size = Setting.course_attachment_max_size.to_i.kilobytes > Setting.attachment_max_size.to_i.kilobytes ? Setting.course_attachment_max_size.to_i.kilobytes : Setting.attachment_max_size.to_i.kilobytes
    if @temp_file && self.filesize > max_file_size
      errors.add(:base, l(:error_attachment_too_big, :max_size => max_file_size))
    end
  end

  def file=(incoming_file)
    unless incoming_file.nil?
      @temp_file = incoming_file
      # 允许上传文件大小为0的文件
      #if @temp_file.size > 0
        if @temp_file.respond_to?(:original_filename)
          self.filename = @temp_file.original_filename
          self.filename.force_encoding("UTF-8") if filename.respond_to?(:force_encoding)
        end
        if @temp_file.respond_to?(:content_type)
          self.content_type = @temp_file.content_type.to_s.chomp
        end
        if content_type.blank? && filename.present?
          self.content_type = Redmine::MimeType.of(filename)
        end
        self.filesize = @temp_file.size
      #end
    end
  end

  def file
    nil
  end

  def filename=(arg)
    write_attribute :filename, sanitize_filename(arg.to_s)
    filename
  end

  def office_conver
    # 不在这里做后台转换，换为点击时做转换
    # return unless %w(Project Course).include? (self.container_type)
    # saved_path = File.join(Rails.root, "files", "convered_office")
    # unless Dir.exist?(saved_path)
    #   Dir.mkdir(saved_path)
    # end
    # convered_file = File.join(saved_path, self.disk_filename + ".pdf")
    # OfficeConverTask.new.conver(self.diskfile, convered_file)
  end

  # Copies the temporary file to its final location
  # and computes its MD5 hash
  def files_to_final_location
    # # 允许上传文件大小为0的文件
    if @temp_file# && (@temp_file.size > 0)
      self.disk_directory = target_directory
      self.disk_filename = Attachment.disk_filename(filename, disk_directory)
      logger.info("Saving attachment '#{self.diskfile}' (#{@temp_file.size} bytes)")
      path = File.dirname(diskfile)
      unless File.directory?(path)
        FileUtils.mkdir_p(path)
      end
      md5 = Digest::MD5.new
      File.open(diskfile, "wb") do |f|
        if @temp_file.respond_to?(:read)
          buffer = ""
          while (buffer = @temp_file.read(8192))
            f.write(buffer)
            md5.update(buffer)
          end
        else
          f.write(@temp_file)
          md5.update(@temp_file)
        end
      end

      self.digest = md5.hexdigest
      logger.info("Saved attachment '#{diskfile}' - #{digest} (#{File.size(diskfile)} bytes)")
    end
    @temp_file = nil
    # Don't save the content type if it's longer than the authorized length
    if self.content_type && self.content_type.length > 255
      self.content_type = nil
    end
  end

  # Deletes the file from the file system if it's not referenced by other attachments
  def delete_from_disk
    #资源存在，且历史记录为0 且 该资源没有存在任何拷贝才能删除资源
    if Attachment.where("disk_filename = ? AND id <> ?", disk_filename, id).empty?  && self.attachment_histories.count == 0 && Attachment.where('copy_from = ?',self.id) .count == 0
      delete_from_disk!
    end
  end

  # 有了历史记录的数据记录是不能被删除的。
  # true 能被删除 false 不能被删除
  # 2016.10.14 修改成可以删除，删除时候添加提示全部删除
  def destroyable
    self.attachment_histories.count == 0
  end

  # Returns file's location on disk
  def diskfile
    File.join(self.class.storage_path, disk_directory.to_s, disk_filename.to_s)
  end

  #标题
  def title
    title = filename.to_s
    if description.present?
      title << " (#{description})"
    end
    title
  end

  def increment_download
    increment!(:downloads)
  end

  def project
    container.try(:project)
  end

  def course
    Course === container ? container : nil
  end

  def visible?(user=User.current)
    if container_id
      container && container.attachments_visible?(user)
    else
      author == user
    end
  end

  def deletable?(user=User.current)
    if container_id
      container && (container.is_a?(Project) ? container.attachments_deletable?(user) : true )
    else
      author == user
    end
  end

  def image?
    !!(self.filename =~ /\.(bmp|gif|jpg|jpe|jpeg|png)$/i)
  end

  def pack?
    !!(self.filename =~ /\.(zip|rar|tar|gz|exe|jar|7z|iso)$/i)
  end

  def thumbnailable?
    image?
  end

  # Returns the full path the attachment thumbnail, or nil
  # if the thumbnail cannot be generated.
  def thumbnail(options={})
    if thumbnailable? && readable?
      size = options[:size].to_i
      if size > 0
        # Limit the number of thumbnails per image
        size = (size / 50) * 50
        # Maximum thumbnail size
        size = 800 if size > 800
      else
        size = Setting.thumbnails_size.to_i
      end
      size = 100 unless size > 0
      target = File.join(self.class.thumbnails_storage_path, "#{id}_#{digest}_#{size}.thumb")
      begin
        Redmine::Thumbnail.generate(self.diskfile, target, size)
      rescue => e
        logger.error "An error occured while generating thumbnail for #{disk_filename} to #{target}\nException was: #{e.message}" if logger
        return nil
      end
    end
  end

  # Deletes all thumbnails
  def self.clear_thumbnails
    Dir.glob(File.join(thumbnails_storage_path, "*.thumb")).each do |file|
      File.delete file
    end
  end

  def is_text?
    Redmine::MimeType.is_type?('text', filename)
  end

  def is_diff?
    self.filename =~ /\.(patch|diff)$/i
  end

  # Returns true if the file is readable
  def readable?
    File.readable?(diskfile)
  end

  # Returns the attachment token
  def token
    "#{id}.#{digest}"
  end

  # Finds an attachment that matches the given token and that has no container
  def self.find_by_token(token)
    attachment = find_by_token_only(token)
    attachment if attachment.container.nil?
  end

  # Finds an attachment that matches the given token
  def self.find_by_token_only(token)
    if token.to_s =~ /^(\d+)\.([0-9a-f]+)$/
      attachment_id, attachment_digest = $1, $2
      attachment = Attachment.where(:id => attachment_id, :digest => attachment_digest).first
    end
  end

  # Bulk attaches a set of files to an object
  #
  # Returns a Hash of the results:
  # :files => array of the attached files
  # :unsaved => array of the files that could not be attached
  def self.attach_files(obj, attachments)
    result = obj.save_attachments(attachments, User.current)
    obj.attach_saved_attachments
    result
  end


  def self.attach_filesex(obj, attachments,attachment_type)
    result = obj.save_attachmentsex(attachments, User.current,attachment_type)
    obj.attach_saved_attachments
    result
  end

  def self.attach_filesex_public(obj, attachments,attachment_type, is_public)
    result = obj.save_attachmentsex_public(attachments, User.current,attachment_type, is_public)
    obj.attach_saved_attachments
    result
  end

  def self.latest_attach(attachments, filename)
    attachments.sort_by(&:created_on).reverse.detect {
      |att| att.filename.downcase == filename.downcase
     }
  end

  def self.prune(age=1.day)
    Attachment.where("created_on < ? AND (container_type IS NULL OR container_type = '')", Time.now - age).destroy_all
  end

  # Moves an existing attachment to its target directory
  def move_to_target_directory!
    if !new_record? & readable?
      src = diskfile
      self.disk_directory = target_directory
      dest = diskfile
      if src != dest && FileUtils.mkdir_p(File.dirname(dest)) && FileUtils.mv(src, dest)
        update_column :disk_directory, disk_directory
      end
    end
  end

  # Moves existing attachments that are stored at the root of the files
  # directory (ie. created before Redmine 2.3) to their target subdirectories
  def self.move_from_root_to_target_directory
    Attachment.where("disk_directory IS NULL OR disk_directory = ''").find_each do |attachment|
      attachment.move_to_target_directory!
    end
  end

  # 获取资源申请状态
  def get_status_by_attach user_id
    ApplyResource.where("user_id =? and attachment_id =?", user_id, self.id).first.try(:status)
  end

  private

  # Physically deletes the file from the file system
  def delete_from_disk!
    if disk_filename.present? && File.exist?(diskfile)
      File.delete(diskfile)
    end
  end

  def sanitize_filename(value)
    # get only the filename, not the whole path
    just_filename = value.gsub(/^.*(\\|\/)/, '')

    # Finally, replace invalid characters with underscore
    @filename = just_filename.gsub(/[\/\?\%\*\:\|\"\'<>]+/, '_')
  end

  # Returns the subdirectory in which the attachment will be saved
  def target_directory
    time = created_on || DateTime.now
    time.strftime("%Y/%m")
  end

  # Returns an ASCII or hashed filename that do not
  # exists yet in the given subdirectory
  def self.disk_filename(filename, directory=nil)
    timestamp = DateTime.now.strftime("%y%m%d%H%M%S")
    ascii = ''
    if filename =~ %r{^[a-zA-Z0-9_\.\-]*$}
      ascii = filename
    else
      ascii = Digest::MD5.hexdigest(filename)
      # keep the extension if any
      ascii << $1 if filename =~ %r{(\.[a-zA-Z0-9]+)$}
    end
    while File.exist?(File.join(storage_path, directory.to_s, "#{timestamp}_#{ascii}"))
      timestamp.succ!
    end
    "#{timestamp}_#{ascii}"
  end


  # update user score
  def be_user_score
    if self.container_id_changed?
      type = self.container_type
      types = %w|Document News Version Project Issue Message WikiPage|
      if types.include?(type)
        #UserScore.project(:push_file, self.author,self, { attachment_id: self.id })

      end
    end
    update_attachment(self.author,1)
    if self.container_type == 'Project'
      update_attachment(self.author,2,self.container)
    end

  end

  #删除附件时重新统计用户的附件数量得分
  def down_user_score
    update_attachment(self.author,1)
    if self.container_type == 'Project'
      update_attachment(self.author,2,self.container)
    end
  end

  # Time 2015-03-02 17:42:48
  # Author lizanle
  # Description 上传该项目的文档资料也要保存一份在公共表中
  def act_as_forge_activity
    if self.container_type == 'Project'  && self.forge_acts.empty?
     self.forge_acts << ForgeActivity.new(:user_id => self.author_id,
                                            :project_id => self.container_id)
    end
  end

  #课程动态公共表记录
  def act_as_course_activity
    if self.container_type == "Course"
      if self.is_publish == 0
        self.course_acts.destroy_all
      else
        if self.is_publish == 1 && self.course_acts.empty?
          self.course_acts << CourseActivity.new(:user_id => self.author_id,:course_id => self.container_id)
        end
      end
    end
  end

  def create_attachment_ealasticsearch_index
    if self.is_public == 1 && ( (self.container_type == 'Project' &&  Project.find(self.container_id).is_public == 1) ||
        ( self.container_type == 'Course' && Course.find(self.container_id).is_public == 1) ||
        self.container_type == 'Principal')
         self.__elasticsearch__.index_document
    end
  end

  def update_attachment_ealasticsearch_index
    if self.is_public == 1 && ( ((self.container_type == 'Project' or self.container_type == 'Version') &&  Project.find(self.container_id).is_public == 1) ||
        ( self.container_type == 'Course' && Course.find(self.container_id).is_public == 1) ||
        self.container_type == 'Principal')
       begin
        self.__elasticsearch__.update_document
       rescue => e
       end
    else
      begin
      self.__elasticsearch__.delete_document
      rescue => e
      end
    end
  end

  def delete_attachment_ealasticsearch_index
    begin
      self.__elasticsearch__.delete_document
    rescue => e
    end
  end

  def decrease_attchments_count
    if self.container_type == "Project" && !self.project.project_score.nil?
      attach_count = self.container.project_score.attach_num - 1
      self.container.project_score.update_attribute(:attach_num, attach_count < 0 ? 0 : attach_count)
    end
  end

  def down_course_score
    if self.container_type == "Course"
      down_course_score_num(self.container_id, self.author_id, "Attachment")
    end
  end
end

# Delete the previous articles index in Elasticsearch
# Attachment.__elasticsearch__.client.indices.delete index: Attachment.index_name rescue nil
#
# # Create the new index with the new mapping
# Attachment.__elasticsearch__.client.indices.create \
#   index: Attachment.index_name,
#   body: { settings: Attachment.settings.to_hash, mappings: Attachment.mappings.to_hash }

# Index all article records from the DB to Elasticsearch
#暂时只做公开课程/项目里的公开资源 和其他的公开资源
#Attachment.where('is_public = 1 and ((container_type in ("Principal")) ' +
#   'or (container_type = "Course" and container_id in( SELECT `courses`.id FROM `courses` WHERE (courses.status <> 9 AND courses.is_public = 1)) )'+
#    'or (container_type = "Project" and container_id in(SELECT `projects`.id FROM `projects` WHERE (projects.status <> 9 AND projects.is_public = 1) ))' +')').import :force=>true