require 'fileutils'
require 'jar_dependencies'
require 'jars/version'
require 'jars/maven_factory'
require 'jars/gemspec_artifacts'

module Jars
  class LockDown

    attr_reader :debug, :verbose

    def initialize( debug, verbose )
      @debug = debug
      @verbose = verbose
    end

    def maven_new
      factory = MavenFactory.new( {}, @debug, @verbose )
      pom = File.expand_path( '../lock_down_pom.rb', __FILE__ )
      m = factory.maven_new( pom )
      m[ 'jruby.plugins.version' ] = Jars::JRUBY_PLUGINS_VERSION
      m[ 'dependency.plugin.version' ] = Jars::DEPENDENCY_PLUGIN_VERSION
      m[ 'jars.basedir' ] = File.expand_path( basedir )
      jarfile = File.expand_path( Jars.jarfile )
      m[ 'jars.jarfile' ] = jarfile if File.exists?( jarfile )
      attach_jar_coordinates_from_bundler_dependencies( m )
      m
    end
    private :maven_new

    def maven
      @maven ||= maven_new
    end

    def basedir
      File.expand_path( '.' )
    end

    def attach_jar_coordinates_from_bundler_dependencies( maven )
      load_path = $LOAD_PATH.dup
      require 'bundler'
      #TODO make this group a commandline option
      Bundler.setup( 'default' )
      maven.property( "jars.bundler", true )
      done = []
      index = 0
      cwd = File.expand_path( "." )
      Gem.loaded_specs.each do |name, spec|
        # if gemspec is local then include all dependencies
        maven.attach_jars( spec, cwd == spec.full_gem_path )
      end
    rescue Exception => e
      case e.class.to_s
      when 'LoadError'
        if Jars.verbose?
          warn e.message
          warn "no bundler found - ignore Gemfile if exists"
        end
      when 'Bundler::GemfileNotFound'
        # do nothing then as we have bundler but no Gemfile
      when 'Bundler::GemNotFound'
        warn "can not setup bundler with #{Bundler.default_lockfile}"
        raise e
      else
        # reraise exception so user sees it
        raise e
      end
    ensure
      $LOAD_PATH.replace( load_path )
    end

    def lock_down( options = {} )
      vendor_dir = File.expand_path( options[ :vendor_dir ] ) if options[ :vendor_dir ]
      out = File.expand_path( '.jars.output' )
      tree = File.expand_path( '.jars.tree' )
      maven.property( 'jars.outputFile', out )
      maven.property( 'maven.repo.local', Jars.local_maven_repo )
      maven.property( 'jars.home', vendor_dir ) if vendor_dir
      maven.property( 'jars.lock', File.expand_path( Jars.lock ) )
      maven.property( 'jars.force', options[ :force ] == true )
      maven.property( 'jars.update', options[ :update ] ) if options[ :update ]
      # tell not to use Jars.lock as part of POM when running mvn
      maven.property( 'jars.skip.lock', true )

      args = [ 'gem:jars-lock' ]
      if options[ :tree ]
        args += [ 'dependency:tree', '-P -gemfile.lock', '-DoutputFile=' + tree ]
      end

      puts
      puts '-- jar root dependencies --'
      puts
      status = maven.exec( *args )
      exit 1 unless status
      if File.exists?( tree )
        puts
        puts '-- jar dependency tree --'
        puts
        puts File.read( tree )
        puts
      end
      puts
      puts File.read( out ).gsub( /#{File.dirname(out)}\//, '' )
      puts
    ensure
      FileUtils.rm_f out
      FileUtils.rm_f tree
    end
  end
end