# Redmine - project management software
# Copyright (C) 2006-2011  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
  before_filter :find_project, :except => :upload
  before_filter :file_readable, :read_authorize, :only => [:show, :download]
  before_filter :delete_authorize, :only => :destroy
  before_filter :authorize_global, :only => :upload

  accept_api_auth :show, :download, :upload

  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
          render :action => 'file'
        else
          download
        end
      }
      format.api
    end
  end

  def download
    if @attachment.container.is_a?(Version) || @attachment.container.is_a?(Project)
      @attachment.increment_download
    end

    # images are sent inline
    send_file @attachment.diskfile, :filename => filename_for_content_disposition(@attachment.filename),
                                    :type => detect_content_type(@attachment),
                                    :disposition => (@attachment.image? ? 'inline' : 'attachment')

  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.body)
    @attachment.author = User.current
    @attachment.filename = ActiveSupport::SecureRandom.hex(16)

    if @attachment.save
      respond_to do |format|
        format.api { render :action => 'upload', :status => :created }
      end
    else
      respond_to do |format|
        format.api { render_validation_errors(@attachment) }
      end
    end
  end

  verify :method => :delete, :only => :destroy
  def destroy
    # Make sure association callbacks are called
    @attachment.container.attachments.delete(@attachment)
    redirect_to :back
  rescue ::ActionController::RedirectBackError
    redirect_to :controller => 'projects', :action => 'show', :id => @project
  end

private
  def find_project
    @attachment = Attachment.find(params[:id])
    # Show 404 if the filename in the url is wrong
    raise ActiveRecord::RecordNotFound if params[:filename] && params[:filename] != @attachment.filename
    @project = @attachment.project
  rescue ActiveRecord::RecordNotFound
    render_404
  end

  # Checks that the file exists and is readable
  def file_readable
    @attachment.readable? ? true : render_404
  end

  def read_authorize
    @attachment.visible? ? true : deny_access
  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
end