# encoding: utf-8
#
# Redmine - project management software
# Copyright (C) 2006-2015  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 'rbpdf'

module Redmine
  module Export
    module PDF
      include ActionView::Helpers::TextHelper
      include ActionView::Helpers::NumberHelper
      include IssuesHelper

      class ITCPDF < RBPDF
        include Redmine::I18n
        attr_accessor :footer_date

        def initialize(lang, orientation='P')
          @@k_path_cache = Rails.root.join('tmp', 'pdf')
          FileUtils.mkdir_p @@k_path_cache unless File::exist?(@@k_path_cache)
          set_language_if_valid lang
          super(orientation, 'mm', 'A4')
          set_print_header(false)
          set_rtl(l(:direction) == 'rtl')
          set_temp_rtl(l(:direction) == 'rtl' ? 'R' : 'L')

          @font_for_content = l(:general_pdf_fontname)
          @font_for_footer  = l(:general_pdf_fontname)
          set_creator(Redmine::Info.app_name)
          set_font(@font_for_content)

          set_header_font([@font_for_content, '', 10])
          set_footer_font([@font_for_content, '', 8])
          set_default_monospaced_font(@font_for_content)
        end

        def SetFontStyle(style, size)
          style.delete!('B') if current_language.to_s.downcase == 'th' # FreeSerif Bold Thai font has problem.
          set_font(@font_for_content, style, size)
        end

        def fix_text_encoding(txt)
          RDMPdfEncoding::rdm_from_utf8(txt, "UTF-8")
        end

        def formatted_text(text)
          html = Redmine::WikiFormatting.to_html(Setting.text_formatting, text)
          # Strip {{toc}} tags
          html.gsub!(/<p>\{\{([<>]?)toc\}\}<\/p>/i, '')
          html
        end

        def RDMCell(w ,h=0, txt='', border=0, ln=0, align='', fill=0, link='')
          cell(w, h, txt, border, ln, align, fill, link)
        end

        def RDMMultiCell(w, h=0, txt='', border=0, align='', fill=0, ln=1)
          multi_cell(w, h, txt, border, align, fill, ln)
        end

        def RDMwriteHTMLCell(w, h, x, y, txt='', attachments=[], border=0, ln=1, fill=0)
          @attachments = attachments

          css_tag = ' <style>
          table, td {
            border: 2px #ff0000 solid;
          }
          th {  background-color:#EEEEEE; padding: 4px; white-space:nowrap; text-align: center;  font-style: bold;}
          pre {
            background-color: #fafafa;
          }
          </style>'

          writeHTMLCell(w, h, x, y,
            css_tag + formatted_text(txt),
            border, ln, fill)
        end

        def get_image_filename(attrname)
          atta = RDMPdfEncoding.attach(@attachments, attrname, "UTF-8")
          if atta
            return atta.diskfile
          else
            return nil
          end
        end

        def get_sever_url(url)
          if !empty_string(url) and (url[0, 1] == '/')
            Setting.host_name.split('/')[0] + url
          else
            url
          end
        end

        def Footer
          set_font(@font_for_footer, 'I', 8)
          set_x(15)
          if get_rtl
            RDMCell(0, 5, @footer_date, 0, 0, 'R')
          else
            RDMCell(0, 5, @footer_date, 0, 0, 'L')
          end
          set_x(-30)
          RDMCell(0, 5, get_alias_num_page() + '/' + get_alias_nb_pages(), 0, 0, 'C')
        end
      end

      def is_cjk?
        case current_language.to_s.downcase
        when 'ja', 'zh-tw', 'zh', 'ko'
          true
        else
          false
        end
      end

      # fetch row values
      def fetch_row_values(issue, query, level)
        query.inline_columns.collect do |column|
          s = if column.is_a?(QueryCustomFieldColumn)
            cv = issue.visible_custom_field_values.detect {|v| v.custom_field_id == column.custom_field.id}
            show_value(cv, false)
          else
            value = issue.send(column.name)
            if column.name == :subject
              value = "  " * level + value
            end
            if value.is_a?(Date)
              format_date(value)
            elsif value.is_a?(Time)
              format_time(value)
            else
              value
            end
          end
          s.to_s
        end
      end

      # calculate columns width
      def calc_col_width(issues, query, table_width, pdf)
        # calculate statistics
        #  by captions
        pdf.SetFontStyle('B',8)
        margins = pdf.get_margins
        col_padding = margins['cell']
        col_width_min = query.inline_columns.map {|v| pdf.get_string_width(v.caption) + col_padding}
        col_width_max = Array.new(col_width_min)
        col_width_avg = Array.new(col_width_min)
        col_min = pdf.get_string_width('OO') + col_padding * 2
        if table_width > col_min * col_width_avg.length
          table_width -= col_min * col_width_avg.length
        else
          col_min = pdf.get_string_width('O') + col_padding * 2
          if table_width > col_min * col_width_avg.length
            table_width -= col_min * col_width_avg.length
          else
            ratio = table_width / col_width_avg.inject(0, :+)
            return col_width = col_width_avg.map {|w| w * ratio}
          end
        end
        word_width_max = query.inline_columns.map {|c|
          n = 10
          c.caption.split.each {|w|
            x = pdf.get_string_width(w) + col_padding
            n = x if n < x
          }
          n
        }

        #  by properties of issues
        pdf.SetFontStyle('',8)
        k = 1
        issue_list(issues) {|issue, level|
          k += 1
          values = fetch_row_values(issue, query, level)
          values.each_with_index {|v,i|
            n = pdf.get_string_width(v) + col_padding * 2
            col_width_max[i] = n if col_width_max[i] < n
            col_width_min[i] = n if col_width_min[i] > n
            col_width_avg[i] += n
            v.split.each {|w|
              x = pdf.get_string_width(w) + col_padding
              word_width_max[i] = x if word_width_max[i] < x
            }
          }
        }
        col_width_avg.map! {|x| x / k}

        # calculate columns width
        ratio = table_width / col_width_avg.inject(0, :+)
        col_width = col_width_avg.map {|w| w * ratio}

        # correct max word width if too many columns
        ratio = table_width / word_width_max.inject(0, :+)
        word_width_max.map! {|v| v * ratio} if ratio < 1

        # correct and lock width of some columns
        done = 1
        col_fix = []
        col_width.each_with_index do |w,i|
          if w > col_width_max[i]
            col_width[i] = col_width_max[i]
            col_fix[i] = 1
            done = 0
          elsif w < word_width_max[i]
            col_width[i] = word_width_max[i]
            col_fix[i] = 1
            done = 0
          else
            col_fix[i] = 0
          end
        end

        # iterate while need to correct and lock coluns width
        while done == 0
          # calculate free & locked columns width
          done = 1
          ratio = table_width / col_width.inject(0, :+)

          # correct columns width
          col_width.each_with_index do |w,i|
            if col_fix[i] == 0
              col_width[i] = w * ratio

              # check if column width less then max word width
              if col_width[i] < word_width_max[i]
                col_width[i] = word_width_max[i]
                col_fix[i] = 1
                done = 0
              elsif col_width[i] > col_width_max[i]
                col_width[i] = col_width_max[i]
                col_fix[i] = 1
                done = 0
              end
            end
          end
        end

        ratio = table_width / col_width.inject(0, :+)
        col_width.map! {|v| v * ratio + col_min}
        col_width
      end

      def render_table_header(pdf, query, col_width, row_height, table_width)
        # headers
        pdf.SetFontStyle('B',8)
        pdf.set_fill_color(230, 230, 230)

        base_x     = pdf.get_x
        base_y     = pdf.get_y
        max_height = get_issues_to_pdf_write_cells(pdf, query.inline_columns, col_width, true)

        # write the cells on page
        issues_to_pdf_write_cells(pdf, query.inline_columns, col_width, max_height, true)
        pdf.set_xy(base_x, base_y + max_height)

        # rows
        pdf.SetFontStyle('',8)
        pdf.set_fill_color(255, 255, 255)
      end

      # Returns a PDF string of a list of issues
      def issues_to_pdf(issues, project, query)
        pdf = ITCPDF.new(current_language, "L")
        title = query.new_record? ? l(:label_issue_plural) : query.name
        title = "#{project} - #{title}" if project
        pdf.set_title(title)
        pdf.alias_nb_pages
        pdf.footer_date = format_date(Date.today)
        pdf.set_auto_page_break(false)
        pdf.add_page("L")

        # Landscape A4 = 210 x 297 mm
        page_height   = pdf.get_page_height # 210
        page_width    = pdf.get_page_width  # 297
        left_margin   = pdf.get_original_margins['left'] # 10
        right_margin  = pdf.get_original_margins['right'] # 10
        bottom_margin = pdf.get_footer_margin
        row_height    = 4

        # column widths
        table_width = page_width - right_margin - left_margin
        col_width = []
        unless query.inline_columns.empty?
          col_width = calc_col_width(issues, query, table_width, pdf)
          table_width = col_width.inject(0, :+)
        end

        # use full width if the description is displayed
        if table_width > 0 && query.has_column?(:description)
          col_width = col_width.map {|w| w * (page_width - right_margin - left_margin) / table_width}
          table_width = col_width.inject(0, :+)
        end

        # title
        pdf.SetFontStyle('B',11)
        pdf.RDMCell(190,10, title)
        pdf.ln

        render_table_header(pdf, query, col_width, row_height, table_width)
        previous_group = false
        issue_list(issues) do |issue, level|
          if query.grouped? &&
               (group = query.group_by_column.value(issue)) != previous_group
            pdf.SetFontStyle('B',10)
            group_label = group.blank? ? 'None' : group.to_s.dup
            group_label << " (#{query.issue_count_by_group[group]})"
            pdf.bookmark group_label, 0, -1
            pdf.RDMCell(table_width, row_height * 2, group_label, 1, 1, 'L')
            pdf.SetFontStyle('',8)
            previous_group = group
          end

          # fetch row values
          col_values = fetch_row_values(issue, query, level)

          # make new page if it doesn't fit on the current one
          base_y     = pdf.get_y
          max_height = get_issues_to_pdf_write_cells(pdf, col_values, col_width)
          space_left = page_height - base_y - bottom_margin
          if max_height > space_left
            pdf.add_page("L")
            render_table_header(pdf, query, col_width, row_height, table_width)
            base_y = pdf.get_y
          end

          # write the cells on page
          issues_to_pdf_write_cells(pdf, col_values, col_width, max_height)
          pdf.set_y(base_y + max_height)

          if query.has_column?(:description) && issue.description?
            pdf.set_x(10)
            pdf.set_auto_page_break(true, bottom_margin)
            pdf.RDMwriteHTMLCell(0, 5, 10, '', issue.description.to_s, issue.attachments, "LRBT")
            pdf.set_auto_page_break(false)
          end
        end

        if issues.size == Setting.issues_export_limit.to_i
          pdf.SetFontStyle('B',10)
          pdf.RDMCell(0, row_height, '...')
        end
        pdf.output
      end

      # returns the maximum height of MultiCells
      def get_issues_to_pdf_write_cells(pdf, col_values, col_widths, head=false)
        heights = []
        col_values.each_with_index do |column, i|
          heights << pdf.get_string_height(col_widths[i], head ? column.caption : column)
        end
        return heights.max
      end

      # Renders MultiCells and returns the maximum height used
      def issues_to_pdf_write_cells(pdf, col_values, col_widths, row_height, head=false)
        col_values.each_with_index do |column, i|
          pdf.RDMMultiCell(col_widths[i], row_height, head ? column.caption : column.strip, 1, '', 1, 0)
        end
      end

      # Draw lines to close the row (MultiCell border drawing in not uniform)
      #
      #  parameter "col_id_width" is not used. it is kept for compatibility.
      def issues_to_pdf_draw_borders(pdf, top_x, top_y, lower_y,
                                     col_id_width, col_widths, rtl=false)
        col_x = top_x
        pdf.line(col_x, top_y, col_x, lower_y)    # id right border
        col_widths.each do |width|
          if rtl
            col_x -= width
          else
            col_x += width
          end
          pdf.line(col_x, top_y, col_x, lower_y)  # columns right border
        end
        pdf.line(top_x, top_y, top_x, lower_y)    # left border
        pdf.line(top_x, lower_y, col_x, lower_y)  # bottom border
      end

      # Returns a PDF string of a single issue
      def issue_to_pdf(issue, assoc={})
        pdf = ITCPDF.new(current_language)
        pdf.set_title("#{issue.project} - #{issue.tracker} ##{issue.id}")
        pdf.alias_nb_pages
        pdf.footer_date = format_date(Date.today)
        pdf.add_page
        pdf.SetFontStyle('B',11)
        buf = "#{issue.project} - #{issue.tracker} ##{issue.id}"
        pdf.RDMMultiCell(190, 5, buf)
        pdf.SetFontStyle('',8)
        base_x = pdf.get_x
        i = 1
        issue.ancestors.visible.each do |ancestor|
          pdf.set_x(base_x + i)
          buf = "#{ancestor.tracker} # #{ancestor.id} (#{ancestor.status.to_s}): #{ancestor.subject}"
          pdf.RDMMultiCell(190 - i, 5, buf)
          i += 1 if i < 35
        end
        pdf.SetFontStyle('B',11)
        pdf.RDMMultiCell(190 - i, 5, issue.subject.to_s)
        pdf.SetFontStyle('',8)
        pdf.RDMMultiCell(190, 5, "#{format_time(issue.created_on)} - #{issue.author}")
        pdf.ln

        left = []
        left << [l(:field_status), issue.status] unless issue.hidden_attribute?('status_id')
        left << [l(:field_priority), issue.priority] unless issue.hidden_attribute?('priority_id')
        left << [l(:field_assigned_to), issue.assigned_to] unless issue.disabled_core_fields.include?('assigned_to_id') or issue.hidden_attribute?('assigned_to_id')
        left << [l(:field_category), issue.category] unless issue.disabled_core_fields.include?('category_id') or issue.hidden_attribute?('category_id')
        left << [l(:field_fixed_version), issue.fixed_version] unless issue.disabled_core_fields.include?('fixed_version_id') or issue.hidden_attribute?('fixed_version_id')

        right = []
        right << [l(:field_start_date), format_date(issue.start_date)] unless issue.disabled_core_fields.include?('start_date') or issue.hidden_attribute?('start_date')
        right << [l(:field_due_date), format_date(issue.due_date)] unless issue.disabled_core_fields.include?('due_date') or issue.hidden_attribute?('due_date')
        right << [l(:field_done_ratio), "#{issue.done_ratio}%"] unless issue.disabled_core_fields.include?('done_ratio') or issue.hidden_attribute?('done_ratio')
        right << [l(:field_estimated_hours), l_hours(issue.estimated_hours)] unless issue.disabled_core_fields.include?('estimated_hours') or issue.hidden_attribute?('estimated_hours')
        right << [l(:label_spent_time), l_hours(issue.total_spent_hours)] if User.current.allowed_to?(:view_time_entries, issue.project)

        rows = left.size > right.size ? left.size : right.size
        while left.size < rows
          left << nil
        end
        while right.size < rows
          right << nil
        end

        half = (issue.visible_custom_field_values.size / 2.0).ceil
        issue.visible_custom_field_values.each_with_index do |custom_value, i|
          (i < half ? left : right) << [custom_value.custom_field.name, show_value(custom_value, false)]
        end

        if pdf.get_rtl
          border_first_top = 'RT'
          border_last_top  = 'LT'
          border_first = 'R'
          border_last  = 'L'
        else
          border_first_top = 'LT'
          border_last_top  = 'RT'
          border_first = 'L'
          border_last  = 'R'
        end

        rows = left.size > right.size ? left.size : right.size
        rows.times do |i|
          heights = []
          pdf.SetFontStyle('B',9)
          item = left[i]
          heights << pdf.get_string_height(35, item ? "#{item.first}:" : "")
          item = right[i]
          heights << pdf.get_string_height(35, item ? "#{item.first}:" : "")
          pdf.SetFontStyle('',9)
          item = left[i]
          heights << pdf.get_string_height(60, item ? item.last.to_s  : "")
          item = right[i]
          heights << pdf.get_string_height(60, item ? item.last.to_s  : "")
          height = heights.max

          item = left[i]
          pdf.SetFontStyle('B',9)
          pdf.RDMMultiCell(35, height, item ? "#{item.first}:" : "", (i == 0 ? border_first_top : border_first), '', 0, 0)
          pdf.SetFontStyle('',9)
          pdf.RDMMultiCell(60, height, item ? item.last.to_s : "", (i == 0 ? border_last_top : border_last), '', 0, 0)

          item = right[i]
          pdf.SetFontStyle('B',9)
          pdf.RDMMultiCell(35, height, item ? "#{item.first}:" : "",  (i == 0 ? border_first_top : border_first), '', 0, 0)
          pdf.SetFontStyle('',9)
          pdf.RDMMultiCell(60, height, item ? item.last.to_s : "", (i == 0 ? border_last_top : border_last), '', 0, 2)

          pdf.set_x(base_x)
        end

        pdf.SetFontStyle('B',9)
        pdf.RDMCell(35+155, 5, l(:field_description), "LRT", 1)
        pdf.SetFontStyle('',9)

        # Set resize image scale
        pdf.set_image_scale(1.6)
        pdf.RDMwriteHTMLCell(35+155, 5, '', '',
              issue.description.to_s, issue.attachments, "LRB")

        unless issue.leaf?
          truncate_length = (!is_cjk? ? 90 : 65)
          pdf.SetFontStyle('B',9)
          pdf.RDMCell(35+155,5, l(:label_subtask_plural) + ":", "LTR")
          pdf.ln
          issue_list(issue.descendants.visible.sort_by(&:lft)) do |child, level|
            buf = "#{child.tracker} # #{child.id}: #{child.subject}".
                    truncate(truncate_length)
            level = 10 if level >= 10
            pdf.SetFontStyle('',8)
            pdf.RDMCell(35+135,5, (level >=1 ? "  " * level : "") + buf, border_first)
            pdf.SetFontStyle('B',8)
            pdf.RDMCell(20,5, child.status.to_s, border_last)
            pdf.ln
          end
        end

        relations = issue.relations.select { |r| r.other_issue(issue).visible? }
        unless relations.empty?
          truncate_length = (!is_cjk? ? 80 : 60)
          pdf.SetFontStyle('B',9)
          pdf.RDMCell(35+155,5, l(:label_related_issues) + ":", "LTR")
          pdf.ln
          relations.each do |relation|
            buf = ""
            buf += "#{l(relation.label_for(issue))} "
            if relation.delay && relation.delay != 0
              buf += "(#{l('datetime.distance_in_words.x_days', :count => relation.delay)}) "
            end
            if Setting.cross_project_issue_relations?
              buf += "#{relation.other_issue(issue).project} - "
            end
            buf += "#{relation.other_issue(issue).tracker}" +
                   " # #{relation.other_issue(issue).id}: #{relation.other_issue(issue).subject}"
            buf = buf.truncate(truncate_length)
            pdf.SetFontStyle('', 8)
            pdf.RDMCell(35+155-60, 5, buf, border_first)
            pdf.SetFontStyle('B',8)
            pdf.RDMCell(20,5, relation.other_issue(issue).status.to_s, "")
            pdf.RDMCell(20,5, format_date(relation.other_issue(issue).start_date), "")
            pdf.RDMCell(20,5, format_date(relation.other_issue(issue).due_date), border_last)
            pdf.ln
          end
        end
        pdf.RDMCell(190,5, "", "T")
        pdf.ln

        if issue.changesets.any? &&
             User.current.allowed_to?(:view_changesets, issue.project)
          pdf.SetFontStyle('B',9)
          pdf.RDMCell(190,5, l(:label_associated_revisions), "B")
          pdf.ln
          for changeset in issue.changesets
            pdf.SetFontStyle('B',8)
            csstr  = "#{l(:label_revision)} #{changeset.format_identifier} - "
            csstr += format_time(changeset.committed_on) + " - " + changeset.author.to_s
            pdf.RDMCell(190, 5, csstr)
            pdf.ln
            unless changeset.comments.blank?
              pdf.SetFontStyle('',8)
              pdf.RDMwriteHTMLCell(190,5,'','',
                    changeset.comments.to_s, issue.attachments, "")
            end
            pdf.ln
          end
        end

        if assoc[:journals].present?
          pdf.SetFontStyle('B',9)
          pdf.RDMCell(190,5, l(:label_history), "B")
          pdf.ln
          assoc[:journals].each do |journal|
            pdf.SetFontStyle('B',8)
            title = "##{journal.indice} - #{format_time(journal.created_on)} - #{journal.user}"
            title << " (#{l(:field_private_notes)})" if journal.private_notes?
            pdf.RDMCell(190,5, title)
            pdf.ln
            pdf.SetFontStyle('I',8)
            details_to_strings(journal.visible_details, true).each do |string|
              pdf.RDMMultiCell(190,5, "- " + string)
            end
            if journal.notes?
              pdf.ln unless journal.details.empty?
              pdf.SetFontStyle('',8)
              pdf.RDMwriteHTMLCell(190,5,'','',
                    journal.notes.to_s, issue.attachments, "")
            end
            pdf.ln
          end
        end

        if issue.attachments.any?
          pdf.SetFontStyle('B',9)
          pdf.RDMCell(190,5, l(:label_attachment_plural), "B")
          pdf.ln
          for attachment in issue.attachments
            pdf.SetFontStyle('',8)
            pdf.RDMCell(80,5, attachment.filename)
            pdf.RDMCell(20,5, number_to_human_size(attachment.filesize),0,0,"R")
            pdf.RDMCell(25,5, format_date(attachment.created_on),0,0,"R")
            pdf.RDMCell(65,5, attachment.author.name,0,0,"R")
            pdf.ln
          end
        end
        pdf.output
      end

      # Returns a PDF string of a set of wiki pages
      def wiki_pages_to_pdf(pages, project)
        pdf = ITCPDF.new(current_language)
        pdf.set_title(project.name)
        pdf.alias_nb_pages
        pdf.footer_date = format_date(Date.today)
        pdf.add_page
        pdf.SetFontStyle('B',11)
        pdf.RDMMultiCell(190,5, project.name)
        pdf.ln
        # Set resize image scale
        pdf.set_image_scale(1.6)
        pdf.SetFontStyle('',9)
        write_page_hierarchy(pdf, pages.group_by(&:parent_id))
        pdf.output
      end

      # Returns a PDF string of a single wiki page
      def wiki_page_to_pdf(page, project)
        pdf = ITCPDF.new(current_language)
        pdf.set_title("#{project} - #{page.title}")
        pdf.alias_nb_pages
        pdf.footer_date = format_date(Date.today)
        pdf.add_page
        pdf.SetFontStyle('B',11)
        pdf.RDMMultiCell(190,5,
             "#{project} - #{page.title} - # #{page.content.version}")
        pdf.ln
        # Set resize image scale
        pdf.set_image_scale(1.6)
        pdf.SetFontStyle('',9)
        write_wiki_page(pdf, page)
        pdf.output
      end

      def write_page_hierarchy(pdf, pages, node=nil, level=0)
        if pages[node]
          pages[node].each do |page|
            if @new_page
              pdf.add_page
            else
              @new_page = true
            end
            pdf.bookmark page.title, level
            write_wiki_page(pdf, page)
            write_page_hierarchy(pdf, pages, page.id, level + 1) if pages[page.id]
          end
        end
      end

      def write_wiki_page(pdf, page)
        pdf.RDMwriteHTMLCell(190,5,'','',
              page.content.text.to_s, page.attachments, 0)
        if page.attachments.any?
          pdf.ln(5)
          pdf.SetFontStyle('B',9)
          pdf.RDMCell(190,5, l(:label_attachment_plural), "B")
          pdf.ln
          for attachment in page.attachments
            pdf.SetFontStyle('',8)
            pdf.RDMCell(80,5, attachment.filename)
            pdf.RDMCell(20,5, number_to_human_size(attachment.filesize),0,0,"R")
            pdf.RDMCell(25,5, format_date(attachment.created_on),0,0,"R")
            pdf.RDMCell(65,5, attachment.author.name,0,0,"R")
            pdf.ln
          end
        end
      end

      class RDMPdfEncoding
        def self.rdm_from_utf8(txt, encoding)
          txt ||= ''
          txt = Redmine::CodesetUtil.from_utf8(txt, encoding)
          if txt.respond_to?(:force_encoding)
            txt.force_encoding('ASCII-8BIT')
          end
          txt
        end

        def self.attach(attachments, filename, encoding)
          filename_utf8 = Redmine::CodesetUtil.to_utf8(filename, encoding)
          atta = nil
          if filename_utf8 =~ /^[^\/"]+\.(gif|jpg|jpe|jpeg|png)$/i
            atta = Attachment.latest_attach(attachments, filename_utf8)
          end
          if atta && atta.readable? && atta.visible?
            return atta
          else
            return nil
          end
        end
      end
    end
  end
end