class KPM::Installer

def self.build_default_config(all_kb_versions=nil)
  all_kb_versions ||= KillbillServerArtifact.versions(KillbillServerArtifact::KILLBILL_ARTIFACT_ID,
                                                      KillbillServerArtifact::KILLBILL_PACKAGING,
                                                      KillbillServerArtifact::KILLBILL_CLASSIFIER,
                                                      nil,
                                                      true).to_a
  latest_stable_version = Gem::Version.new('0.0.0')
  all_kb_versions.each do |kb_version|
    version = Gem::Version.new(kb_version) rescue nil
    next if version.nil?
    major, minor, patch, pre = version.segments
    next if !pre.nil? || minor.nil? || minor.to_i.odd?
    latest_stable_version = version if version > latest_stable_version
  end
  # Note: we assume no unstable version of Kaui is published today
  {'killbill' => {'version' => latest_stable_version.to_s, 'plugins' => {'ruby' => [{'name' => 'kpm'}]}}, 'kaui' => {'version' => 'LATEST'}}
end

def self.from_file(config_path=nil, logger=nil)
  if config_path.nil?
    # Install Kill Bill, Kaui and the KPM plugin by default
    config = build_default_config
  else
    config = YAML::load_file(config_path)
  end
  Installer.new(config, logger)
end

def clean_up_descriptors(bundles_dir)
  removed_plugins = clean_up_plugin_identifiers(bundles_dir)
  clean_up_sha1s(removed_plugins, bundles_dir)
end

def clean_up_plugin_identifiers(bundles_dir)
  inspector = KPM::Inspector.new
  installed_plugins = inspector.inspect(bundles_dir)
  plugins_installation_path = File.join(bundles_dir, 'plugins')
  plugins_manager = KPM::PluginsManager.new(plugins_installation_path, @logger)
  plugin_identifiers = plugins_manager.read_plugin_identifiers
  removed_identifiers = []
  plugin_identifiers.each do |plugin_key, plugin|
    if !installed_plugins.has_key?(plugin['plugin_name'])
      _, plugin_entry = plugins_manager.get_identifier_key_and_entry(plugin_key)
      plugins_manager.remove_plugin_identifier_key(plugin_key)
      removed_identifiers << plugin_entry
    end
  end
  removed_identifiers
end

def clean_up_sha1s(removed_plugins, plugins_dir)
  sha1checker = KPM::Sha1Checker.from_file(File.join(plugins_dir, KPM::BaseInstaller::SHA1_FILENAME))
  removed_plugins.each do |removed|
    coordinates = KPM::Coordinates.build_coordinates(group_id: removed['group_id'],
                                                     artifact_id: removed['artifact_id'],
                                                     packaging: removed['packaging'],
                                                     classifier: removed['classifier'],
                                                     version: removed['version'])
    sha1checker.remove_entry!(coordinates)
  end
end

def initialize(raw_config, logger=nil)
  @config = raw_config['killbill']
  @kaui_config = raw_config['kaui']
  if logger.nil?
    logger = Logger.new(STDOUT)
    logger.level = Logger::INFO
  end
  nexus_config = !@config.nil? ? @config['nexus'] : (!@kaui_config.nil? ? @kaui_config['nexus'] : nil)
  nexus_ssl_verify = !nexus_config.nil? ? nexus_config['ssl_verify'] : true
  super(logger, nexus_config, nexus_ssl_verify)
end

def install(force_download=false, verify_sha1=true)
  bundles_dir = !@config.nil? ? @config['plugins_dir'] : (!@kaui_config.nil? ? @kaui_config['plugins_dir'] : nil)
  bundles_dir ||= DEFAULT_BUNDLES_DIR
  help = nil
  unless @config.nil?
    help = install_tomcat if @config['webapp_path'].nil?
    install_killbill_server(@config['group_id'], @config['artifact_id'], @config['packaging'], @config['classifier'], @config['version'], @config['webapp_path'], bundles_dir, force_download, verify_sha1)
    install_plugins(bundles_dir, @config['version'], force_download, verify_sha1)
    unless @config['default_bundles'] == false
      install_default_bundles(bundles_dir, @config['default_bundles_version'], @config['version'], force_download, verify_sha1)
    end
    clean_up_descriptors(bundles_dir)
  end
  unless @kaui_config.nil?
    if @kaui_config['webapp_path'].nil?
      @logger.warn('No webapp_path specified for Kaui, aborting installation')
      return
    end
    install_kaui(@kaui_config['group_id'], @kaui_config['artifact_id'], @kaui_config['packaging'], @kaui_config['classifier'], @kaui_config['version'], @kaui_config['webapp_path'], bundles_dir, force_download, verify_sha1)
  end
  help
end

def install_java_plugins(bundles_dir, raw_kb_version, force_download, verify_sha1)
  return if @config['plugins'].nil? or @config['plugins']['java'].nil?
  infos = []
  @config['plugins']['java'].each do |plugin|
    infos << install_plugin(plugin['name'], raw_kb_version, plugin['group_id'], plugin['artifact_id'], plugin['packaging'], plugin['classifier'], plugin['version'], bundles_dir, 'java', force_download, verify_sha1, false)
  end
  infos
end

def install_plugins(bundles_dir, raw_kb_version, force_download, verify_sha1)
  install_java_plugins(bundles_dir, raw_kb_version, force_download, verify_sha1)
  install_ruby_plugins(bundles_dir, raw_kb_version, force_download, verify_sha1)
end

def install_ruby_plugins(bundles_dir, raw_kb_version, force_download, verify_sha1)
  return if @config['plugins'].nil? or @config['plugins']['ruby'].nil?
  verify_jruby_jar=true
  infos = []
  @config['plugins']['ruby'].each do |plugin|
    infos << install_plugin(plugin['name'], raw_kb_version, plugin['group_id'], plugin['artifact_id'], plugin['packaging'], plugin['classifier'], plugin['version'], bundles_dir, 'ruby', force_download, verify_sha1, verify_jruby_jar)
    verify_jruby_jar=false
  end
  infos
end

def install_tomcat(dir=Dir.pwd)
  # Download and unpack Tomcat
  manager = KPM::TomcatManager.new(dir, @logger)
  manager.download
  # Update main config
  root_war_path = manager.setup
  @config['webapp_path'] = root_war_path
  unless @kaui_config.nil?
    @kaui_config['webapp_path'] = Pathname.new(File.dirname(root_war_path)).join('kaui.war').to_s
  end
  # Help message
  manager.help
end