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# 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.

require 'redmine/scm/adapters/abstract_adapter'

require 'rexml/document'

module Redmine

  module Scm

    module Adapters

      class DarcsAdapter < AbstractAdapter

        # Darcs executable name

        DARCS_BIN = Redmine::Configuration['scm_darcs_command'] || "darcs"

        class << self

          def client_command

            @@bin    ||= DARCS_BIN

          end

          def sq_bin

            @@sq_bin ||= shell_quote_command

          end

          def client_version

            @@client_version ||= (darcs_binary_version || [])

          end

          def client_available

            !client_version.empty?

          end

          def darcs_binary_version

            darcsversion = darcs_binary_version_from_command_line.dup

            if darcsversion.respond_to?(:force_encoding)

              darcsversion.force_encoding('ASCII-8BIT')

            end

            if m = darcsversion.match(%r{\A(.*?)((\d+\.)+\d+)})

              m[2].scan(%r{\d+}).collect(&:to_i)

            end

          end

          def darcs_binary_version_from_command_line

            shellout("#{sq_bin} --version") { |io| io.read }.to_s

          end

        end

        def initialize(url, root_url=nil, login=nil, password=nil,

                       path_encoding=nil)

          @url = url

          @root_url = url

        end

        def supports_cat?

          # cat supported in darcs 2.0.0 and higher

          self.class.client_version_above?([2, 0, 0])

        end

        # Get info about the darcs repository

        def info

          rev = revisions(nil,nil,nil,{:limit => 1})

          rev ? Info.new({:root_url => @url, :lastrev => rev.last}) : nil

        end

        # Returns an Entries collection

        # or nil if the given path doesn't exist in the repository

        def entries(path=nil, identifier=nil, options={})

          path_prefix = (path.blank? ? '' : "#{path}/")

          if path.blank?

            path = ( self.class.client_version_above?([2, 2, 0]) ? @url : '.' )

          end

          entries = Entries.new

          cmd = "#{self.class.sq_bin} annotate --repodir #{shell_quote @url} --xml-output"

          cmd << " --match #{shell_quote("hash #{identifier}")}" if identifier

          cmd << " #{shell_quote path}"

          shellout(cmd) do |io|

            begin

              doc = REXML::Document.new(io)

              if doc.root.name == 'directory'

                doc.elements.each('directory/*') do |element|

                  next unless ['file', 'directory'].include? element.name

                  entries << entry_from_xml(element, path_prefix)

                end

              elsif doc.root.name == 'file'

                entries << entry_from_xml(doc.root, path_prefix)

              end

            rescue

            end

          end

          return nil if $? && $?.exitstatus != 0

          entries.compact.sort_by_name

        end

        def revisions(path=nil, identifier_from=nil, identifier_to=nil, options={})

          path = '.' if path.blank?

          revisions = Revisions.new

          cmd = "#{self.class.sq_bin} changes --repodir #{shell_quote @url} --xml-output"

          cmd << " --from-match #{shell_quote("hash #{identifier_from}")}" if identifier_from

          cmd << " --last #{options[:limit].to_i}" if options[:limit]

          shellout(cmd) do |io|

            begin

              doc = REXML::Document.new(io)

              doc.elements.each("changelog/patch") do |patch|

                message = patch.elements['name'].text

                message << "\n" + patch.elements['comment'].text.gsub(/\*\*\*END OF DESCRIPTION\*\*\*.*\z/m, '') if patch.elements['comment']

                revisions << Revision.new({:identifier => nil,

                              :author => patch.attributes['author'],

                              :scmid => patch.attributes['hash'],

                              :time => Time.parse(patch.attributes['local_date']),

                              :message => message,

                              :paths => (options[:with_path] ? get_paths_for_patch(patch.attributes['hash']) : nil)

                            })

              end

            rescue

            end

          end

          return nil if $? && $?.exitstatus != 0

          revisions

        end

        def diff(path, identifier_from, identifier_to=nil)

          path = '*' if path.blank?

          cmd = "#{self.class.sq_bin} diff --repodir #{shell_quote @url}"

          if identifier_to.nil?

            cmd << " --match #{shell_quote("hash #{identifier_from}")}"

          else

            cmd << " --to-match #{shell_quote("hash #{identifier_from}")}"

            cmd << " --from-match #{shell_quote("hash #{identifier_to}")}"

          end

          cmd << " -u #{shell_quote path}"

          diff = []

          shellout(cmd) do |io|

            io.each_line do |line|

              diff << line

            end

          end

          return nil if $? && $?.exitstatus != 0

          diff

        end

        def cat(path, identifier=nil)

          cmd = "#{self.class.sq_bin} show content --repodir #{shell_quote @url}"

          cmd << " --match #{shell_quote("hash #{identifier}")}" if identifier

          cmd << " #{shell_quote path}"

          cat = nil

          shellout(cmd) do |io|

            io.binmode

            cat = io.read

          end

          return nil if $? && $?.exitstatus != 0

          cat

        end

        private

        # Returns an Entry from the given XML element

        # or nil if the entry was deleted

        def entry_from_xml(element, path_prefix)

          modified_element = element.elements['modified']

          if modified_element.elements['modified_how'].text.match(/removed/)

            return nil

          end

          Entry.new({:name => element.attributes['name'],

                     :path => path_prefix + element.attributes['name'],

                     :kind => element.name == 'file' ? 'file' : 'dir',

                     :size => nil,

                     :lastrev => Revision.new({

                       :identifier => nil,

                       :scmid => modified_element.elements['patch'].attributes['hash']

                       })

                     })

        end

        def get_paths_for_patch(hash)

          paths = get_paths_for_patch_raw(hash)

          if self.class.client_version_above?([2, 4])

            orig_paths = paths

            paths = []

            add_paths = []

            add_paths_name = []

            mod_paths = []

            other_paths = []

            orig_paths.each do |path|

              if path[:action] == 'A'

                add_paths << path

                add_paths_name << path[:path]

              elsif path[:action] == 'M'

                mod_paths << path

              else

                other_paths << path

              end

            end

            add_paths_name.each do |add_path|

              mod_paths.delete_if { |m| m[:path] == add_path }

            end

            paths.concat add_paths

            paths.concat mod_paths

            paths.concat other_paths

          end

          paths

        end

        # Retrieve changed paths for a single patch

        def get_paths_for_patch_raw(hash)

          cmd = "#{self.class.sq_bin} annotate --repodir #{shell_quote @url} --summary --xml-output"

          cmd << " --match #{shell_quote("hash #{hash}")} "

          paths = []

          shellout(cmd) do |io|

            begin

              # Darcs xml output has multiple root elements in this case (tested with darcs 1.0.7)

              # A root element is added so that REXML doesn't raise an error

              doc = REXML::Document.new("<fake_root>" + io.read + "</fake_root>")

              doc.elements.each('fake_root/summary/*') do |modif|

                paths << {:action => modif.name[0,1].upcase,

                          :path => "/" + modif.text.chomp.gsub(/^\s*/, '')

                         }

              end

            rescue

            end

          end

          paths

        rescue CommandFailed

          paths

        end

      end

    end

  end

end