require 'stringio'
require 'rexml/document'

module BuildMaster

class SvnDriver    
    def SvnDriver::from_path(directory)
        return SvnDriver.new(directory)
    end
    
    attr_reader :work_dir, :repository_url
    
    def initialize(work_dir, repository_root = nil, repository_url = nil)
        @system = work_dir.system
        @work_dir = work_dir
        @repository_root = repository_root
        @repository_url = repository_url
    end
    
    def repository_root
      load_svn_info unless @repository_root
      return @repository_root
    end
    
    def repository_url
      if (not @repository_url)
        @repository_url = "#{repository_root}/trunk"
      end
      return @repository_url
    end
    
    def status
        command_for_path('status')
    end
    
    def update
        command_for_path('update')
    end
    
    def commit(comment)
        command_for_path('commit', " -m \"#{comment}\"") 
    end
    
    def tag(tag_name)
        @system.shell("svn copy #{repository_url} #{repository_root}/tags/#{tag_name} -m \"ruby buildmaster\"")
    end
    
    def checkout(output)
        @system.shell("svn checkout #{repository_root}/trunk #{output}")
    end
    
    def command(command)
        command_for_path(command)
    end
    
    private
    def load_svn_info
      info = @system.shell_output("svn info #{work_dir.path}")
      StringIO.new(info).each_line do |line|
        index = line.index(':')
        if (index)
          property = line[0, index].strip
          value = line[index + 1, line.length - index - 1].strip
          if (property == 'Repository Root')
            @repository_root = value
          elsif (property == 'URL')
            @repository_url = value
          end
        end
      end
    end
    
    def command_for_path(svn_command, argument='')
        @system.shell("svn #{svn_command} #{@work_dir.path}#{argument}")
    end
end

end