require 'autobuild/config'
require 'autobuild/subcommand'
require 'autobuild/importer'

module Autobuild
    class DarcsImporter < Importer
        # Creates a new importer which gets the source from the Darcs repository
        # +source+ # The following values are allowed in +options+:
        # [:get] options to give to 'darcs get'.
        # [:pull] options to give to 'darcs pull'.
        #
        # This importer uses the 'darcs' tool to perform the import. It defaults
        # to 'darcs' and can be configured by doing 
        #   Autobuild.programs['darcs'] = 'my_darcs_tool'
        def initialize(source, options = {})
            @source   = source
            @program  = Autobuild.tool('darcs')
            super(options.merge(repository_id: source))
            @pull = [*options[:pull]]
            @get  = [*options[:get]]
        end
        
        private

        def update(package, options = Hash.new) # :nodoc:
            if options[:only_local]
                package.warn "%s: the darcs importer does not support local updates, skipping"
                return false
            end
            if !File.directory?( File.join(package.srcdir, '_darcs') )
                raise ConfigException.new(package, 'import'),
                    "#{package.srcdir} is not a Darcs repository"
            end

            package.run(:import, @program, 
               'pull', '--all', "--repodir=#{package.srcdir}", '--set-scripts-executable', @source, *@pull, retry: true)
            true # no easy to know if package was updated, keep previous behavior
        end

        def checkout(package, options = Hash.new) # :nodoc:
            basedir = File.dirname(package.srcdir)
            unless File.directory?(basedir)
                FileUtils.mkdir_p(basedir)
            end

            package.run(:import, @program, 
               'get', '--set-scripts-executable', @source, package.srcdir, *@get, retry: true)
        end
    end

    # Returns the Darcs importer which will get the source from the Darcs repository
    # +source+. The allowed values in +options+ are described in DarcsImporter.new.
    def self.darcs(source, options = {})
        DarcsImporter.new(source, options)
    end
end