module JenkinsPipelineBuilder
  class ExtensionSet
    SET_METHODS = %i[
      name
      plugin_id
      jenkins_name
      description
      announced
      type
    ].freeze

    SET_METHODS.each do |method_name|
      define_method method_name do |value = nil|
        return settings[method_name] if value.nil?

        settings[method_name] = value
      end
    end

    attr_accessor :blocks, :extensions, :settings

    def initialize(type, path = nil, &block)
      @blocks = {}
      @settings = {}
      @extensions = []

      instance_eval(&block)

      blocks.each do |version, settings|
        add_extension type, version, settings, path
      end
    end

    def clear_installed_version
      @version = nil
    end

    def installed_version=(version)
      @version = Gem::Version.new version
    end

    def add_extension(type, version, settings, path = nil)
      ext = JenkinsPipelineBuilder::Extension.new
      ext.min_version version
      ext.type type
      self.settings.merge(settings).each do |key, value|
        ext.send key, value
      end

      ext.path path unless ext.path
      extensions << ext
    end

    def installed_version
      return @version if @version

      reg = JenkinsPipelineBuilder.registry
      version = reg.versions[settings[:plugin_id]]
      raise "Plugin #{settings[:name]} is not installed (plugin_id: #{settings[:plugin_id]})" if version.nil?

      self.installed_version = version
      @version
    end

    def extension
      # TODO: Support multiple xml sections for the native to jenkins plugins
      return extensions.first if settings[:plugin_id] == 'builtin'

      extension = versions[highest_allowed_version]

      unless extension
        raise %(Can't find version of #{name} lte #{installed_version}.
          Available versions: #{versions.keys.map(&:to_s)})
      end
      extension
    end

    def merge(other_set)
      mismatch = []
      SET_METHODS.each do |method_name|
        val1 = settings[method_name]
        val2 = other_set.settings[method_name]
        mismatch << "The values for #{method_name} do not match '#{val1}' : '#{val2}'" unless val1 == val2
      end
      mismatch.each do |error|
        logger.error error
      end
      raise 'Values did not match, cannot merge extension sets' if mismatch.any?

      self.extensions = versions.merge(other_set.versions).values
    end

    def parameters(params)
      version = @min_version || '0'

      blocks[version] = {} unless blocks[version]
      blocks[version][:parameters] = params
    end

    def xml(path: false, version: '0', &block)
      if @min_version
        version = @min_version
      elsif version != '0'
        deprecation_warning(settings[:name], 'xml')
      end
      unless block
        raise "no block found for version #{version}" unless blocks.key version

        return blocks[version][:block]
      end
      store_xml version, block, path
    end

    def version(ver, &block)
      @min_version = ver
      yield block
    end

    %i[after before].each do |method_name|
      define_method method_name do |version: '0', &block|
        if @min_version
          version = @min_version
        elsif version != '0'
          deprecation_warning(settings[:name], method_name)
        end

        return instance_variable_get(method_name) unless block

        blocks[version] = {} unless blocks[version]
        blocks[version][method_name] = block
      end
    end

    def valid?
      valid = errors.empty?
      unless valid
        name ||= 'A plugin with no name provided'
        logger.error "Encountered errors while registering #{name}"
        logger.error errors.map { |k, v| "#{k}: #{v}" }.join(', ')
      end
      valid
    end

    def errors
      errors = {}
      errors['ExtensionSet'] = 'no extensions successfully registered' if extensions.empty?
      extensions.each do |ext|
        ver = ext.min_version || 'unknown'
        errors["#{ext.name} version #{ver}"] = ext.errors unless ext.valid?
      end
      errors
    end

    def versions
      # Don't memoize this, it will prevent local overrides
      extensions.each_with_object({}) do |ext, hash|
        hash[Gem::Version.new(ext.min_version)] = ext
      end
    end

    private

    def logger
      JenkinsPipelineBuilder.logger
    end

    def highest_allowed_version
      ordered_version_list.each do |version|
        return version if version <= installed_version
      end
    end

    def store_xml(version, block, path)
      if blocks[version]
        blocks[version].merge!(xml: block, path: path)
      else
        blocks[version] = { xml: block, path: path }
      end
    end

    def ordered_version_list
      versions.keys.sort.reverse
    end

    def deprecation_warning(name, block)
      logger.warn %(WARNING: #{name} set the version in the #{block} block, this is deprecated.
      Please use a version block.)
    end
  end
end