require 'jar_dependencies'
require 'jars/maven_factory'

module Jars
  class MavenExec
    def find_spec(allow_no_file)
      specs = Dir['*.gemspec']
      case specs.size
      when 0
        raise 'no gemspec found' unless allow_no_file
      when 1
        specs.first
      else
        raise 'more then one gemspec found. please specify a specfile' unless allow_no_file
      end
    end
    private :find_spec

    attr_reader :basedir, :spec, :specfile

    def initialize(spec = nil)
      @options = {}
      setup(spec)
    rescue StandardError, LoadError => e
      # If spec load fails, skip looking for jar-dependencies
      warn 'jar-dependencies: ' + e.to_s
      warn e.backtrace.join("\n") if Jars.verbose?
    end

    def setup(spec = nil, allow_no_file = false)
      spec ||= find_spec(allow_no_file)

      case spec
      when String
        @specfile = File.expand_path(spec)
        @basedir = File.dirname(@specfile)
        Dir.chdir(@basedir) do
          spec = eval(File.read(@specfile), TOPLEVEL_BINDING, @specfile)
        end
      when Gem::Specification
        if File.exist?(spec.spec_file)
          @basedir = spec.gem_dir
          @specfile = spec.spec_file
        else
          # this happens with bundle and local gems
          # there the spec_file is "not installed" but inside
          # the gem_dir directory
          Dir.chdir(spec.gem_dir) do
            setup(nil, true)
          end
        end
      when NilClass
      else
        Jars.debug('spec must be either String or Gem::Specification. ' +
                   'File an issue on github if you need it.')
      end
      @spec = spec
    end

    def ruby_maven_install_options=(options)
      @options = options
    end

    def resolve_dependencies_list(file)
      factory = MavenFactory.new(@options)
      maven = factory.maven_new(File.expand_path('../gemspec_pom.rb', __FILE__))

      is_local_file = File.expand_path(File.dirname(@specfile)) == File.expand_path(Dir.pwd)
      maven.attach_jars(@spec, is_local_file)

      maven['jars.specfile'] = @specfile.to_s
      maven['outputAbsoluteArtifactFilename'] = 'true'
      maven['includeTypes'] = 'jar'
      maven['outputScope'] = 'true'
      maven['useRepositoryLayout'] = 'true'
      maven['outputDirectory'] = Jars.home.to_s
      maven['outputFile'] = file.to_s

      maven.exec('dependency:copy-dependencies', 'dependency:list')
    end
  end
end