# redMine - project management software
# Copyright (C) 2006  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 'iconv'

module RepositoriesHelper
  def format_revision(revision)
    if revision.respond_to? :format_identifier
      revision.format_identifier
    else
      revision.to_s
    end
  end

  def truncate_at_line_break(text, length = 255)
    if text
      text.gsub(%r{^(.{#{length}}[^\n]*)\n.+$}m, '\\1...')
    end
  end

  def render_properties(properties)
    unless properties.nil? || properties.empty?
      content = ''
      properties.keys.sort.each do |property|
        content << content_tag('li', "<b>#{h property}</b>: <span>#{h properties[property]}</span>")
      end
      content_tag('ul', content, :class => 'properties')
    end
  end

  def render_changeset_changes
    changes = @changeset.changes.find(:all, :limit => 1000, :order => 'path').collect do |change|
      case change.action
      when 'A'
        # Detects moved/copied files
        if !change.from_path.blank?
          change.action = @changeset.changes.detect {|c| c.action == 'D' && c.path == change.from_path} ? 'R' : 'C'
        end
        change
      when 'D'
        @changeset.changes.detect {|c| c.from_path == change.path} ? nil : change
      else
        change
      end
   end.compact
    
    tree = { }
    changes.each do |change|
      p = tree
      dirs = change.path.to_s.split('/').select {|d| !d.blank?}
      path = ''
      dirs.each do |dir|
        path += '/' + dir
        p[:s] ||= {}
        p = p[:s]
        p[path] ||= {}
        p = p[path]
      end
      p[:c] = change
    end
    
    render_changes_tree(tree[:s])
  end

  def render_changes_tree(tree)
    return '' if tree.nil?

    output = ''
    output << '<ul>'
    tree.keys.sort.each do |file|
      style = 'change'
      text = File.basename(h(file))
      if s = tree[file][:s]
        style << ' folder'
        path_param = to_path_param(@repository.relative_path(file))
        text = link_to(text, :controller => 'repositories',
                             :action => 'show',
                             :id => @project,
                             :path => path_param,
                             :rev => @changeset.identifier)
        output << "<li class='#{style}'>#{text}</li>"
        output << render_changes_tree(s)
      elsif c = tree[file][:c]
        style << " change-#{c.action}"
        path_param = to_path_param(@repository.relative_path(c.path))
        text = link_to(text, :controller => 'repositories',
                             :action => 'entry',
                             :id => @project,
                             :path => path_param,
                             :rev => @changeset.identifier) unless c.action == 'D'
        text << " - #{c.revision}" unless c.revision.blank?
        text << ' (' + link_to('diff', :controller => 'repositories',
                                       :action => 'diff',
                                       :id => @project,
                                       :path => path_param,
                                       :rev => @changeset.identifier) + ') ' if c.action == 'M'
        text << ' ' + content_tag('span', c.from_path, :class => 'copied-from') unless c.from_path.blank?
        output << "<li class='#{style}'>#{text}</li>"
      end
    end
    output << '</ul>'
    output
  end

  def to_utf8(str)
    return str if str.blank?
    if str.respond_to?(:force_encoding)
      str.force_encoding('UTF-8')
    else
      # TODO:
      # Japanese Shift_JIS(CP932) is not compatible with ASCII.
      # UTF-7 and Japanese ISO-2022-JP are 7bits clean.
      return str if /\A[\r\n\t\x20-\x7e]*\Z/n.match(str) # for us-ascii
    end

    @encodings ||= Setting.repositories_encodings.split(',').collect(&:strip)
    @encodings.each do |encoding|
      begin
        return Iconv.conv('UTF-8', encoding, str)
      rescue Iconv::Failure
        # do nothing here and try the next encoding
      end
    end
    str = replace_invalid_utf8(str)
  end

  def replace_invalid_utf8(str)
    if str.respond_to?(:force_encoding)
      str.force_encoding('UTF-8')
      if ! str.valid_encoding?
        str = str.encode("US-ASCII", :invalid => :replace,
              :undef => :replace, :replace => '?').encode("UTF-8")
      end
    end
    str
  end

  def repository_field_tags(form, repository)
    method = repository.class.name.demodulize.underscore + "_field_tags"
    if repository.is_a?(Repository) &&
        respond_to?(method) && method != 'repository_field_tags'
      send(method, form, repository)
    end
  end

  def scm_select_tag(repository)
    scm_options = [["--- #{l(:actionview_instancetag_blank_option)} ---", '']]
    Redmine::Scm::Base.all.each do |scm|
    if Setting.enabled_scm.include?(scm) ||
          (repository && repository.class.name.demodulize == scm)
        scm_options << ["Repository::#{scm}".constantize.scm_name, scm]
      end
    end
    select_tag('repository_scm', 
               options_for_select(scm_options, repository.class.name.demodulize),
               :disabled => (repository && !repository.new_record?),
               :onchange => remote_function(
                  :url => {
                      :controller => 'repositories',
                      :action => 'edit',
                      :id => @project
                        },
               :method => :get,
               :with => "Form.serialize(this.form)")
               )
  end

  def with_leading_slash(path)
    path.to_s.starts_with?('/') ? path : "/#{path}"
  end

  def without_leading_slash(path)
    path.gsub(%r{^/+}, '')
  end

  def subversion_field_tags(form, repository)
      content_tag('p', form.text_field(:url, :size => 60, :required => true,
                       :disabled => (repository && !repository.root_url.blank?)) +
                       '<br />(file:///, http://, https://, svn://, svn+[tunnelscheme]://)') +
      content_tag('p', form.text_field(:login, :size => 30)) +
      content_tag('p', form.password_field(
                            :password, :size => 30, :name => 'ignore',
                            :value => ((repository.new_record? || repository.password.blank?) ? '' : ('x'*15)),
                            :onfocus => "this.value=''; this.name='repository[password]';",
                            :onchange => "this.name='repository[password]';"))
  end

  def darcs_field_tags(form, repository)
      content_tag('p', form.text_field(:url, :label => 'Root directory',
                       :size => 60, :required => true,
                       :disabled => (repository && !repository.new_record?))) +
      content_tag('p', form.select(:log_encoding, [nil] + Setting::ENCODINGS,
                                 :label => 'Commit messages encoding', :required => true))
  end

  def mercurial_field_tags(form, repository)
    content_tag('p', form.text_field(:url, :label => 'Root directory',
                       :size => 60, :required => true,
                       :disabled => (repository && !repository.root_url.blank?)) +
                       '<br />local repository (e.g. /hgrepo, c:\hgrepo)' ) +
    content_tag('p', form.select(
                        :path_encoding, [nil] + Setting::ENCODINGS,
                        :label => 'Path encoding') +
                        '<br />Default: UTF-8')
  end

  def git_field_tags(form, repository)
      content_tag('p', form.text_field(:url, :label => 'Path to repository',
                       :size => 60, :required => true,
                       :disabled => (repository && !repository.root_url.blank?)) +
                       '<br />a bare and local repository (e.g. /gitrepo, c:\gitrepo)')
  end

  def cvs_field_tags(form, repository)
      content_tag('p', form.text_field(:root_url,
                       :label => 'CVSROOT', :size => 60, :required => true,
                       :disabled => !repository.new_record?)) +
      content_tag('p', form.text_field(:url, :label => 'Module',
                       :size => 30, :required => true,
                       :disabled => !repository.new_record?)) +
      content_tag('p', form.select(:log_encoding, [nil] + Setting::ENCODINGS,
                                 :label => 'Commit messages encoding', :required => true))
  end

  def bazaar_field_tags(form, repository)
      content_tag('p', form.text_field(:url, :label => 'Root directory',
                       :size => 60, :required => true,
                       :disabled => (repository && !repository.new_record?))) +
      content_tag('p', form.select(:log_encoding, [nil] + Setting::ENCODINGS,
                                 :label => 'Commit messages encoding', :required => true))
  end

  def filesystem_field_tags(form, repository)
    content_tag('p', form.text_field(:url, :label => 'Root directory',
                     :size => 60, :required => true,
                     :disabled => (repository && !repository.root_url.blank?))) +
    content_tag('p', form.select(
                        :path_encoding, [nil] + Setting::ENCODINGS,
                        :label => 'Path encoding') +
                        '<br />Default: UTF-8')
  end
end