require "json"

module Bibliothecary
  module Parsers
    class Packagist
      include Bibliothecary::Analyser

      def self.mapping
        {
          match_filename("composer.json") => {
            kind: "manifest",
            parser: :parse_manifest,
          },
          match_filename("composer.lock") => {
            kind: "lockfile",
            parser: :parse_lockfile,
          },
        }
      end

      add_multi_parser(Bibliothecary::MultiParsers::CycloneDX)
      add_multi_parser(Bibliothecary::MultiParsers::DependenciesCSV)
      add_multi_parser(Bibliothecary::MultiParsers::Spdx)

      def self.parse_lockfile(file_contents, options: {}) # rubocop:disable Lint/UnusedMethodArgument
        manifest = JSON.parse file_contents
        manifest.fetch("packages",[]).map do |dependency|
          requirement = dependency["version"]

          # Store Drupal version if Drupal, but include the original manifest version for reference
          original_requirement, requirement = requirement, dependency.dig("source", "reference") if is_drupal_module(dependency)

          Dependency.new(
            name: dependency["name"],
            requirement: requirement,
            type: "runtime",
            original_requirement: original_requirement
          )
        end + manifest.fetch("packages-dev",[]).map do |dependency|
          requirement = dependency["version"]

          # Store Drupal version if Drupal, but include the original manifest version for reference
          original_requirement, requirement = requirement, dependency.dig("source", "reference") if is_drupal_module(dependency)

          Dependency.new(
            name: dependency["name"],
            requirement: requirement,
            type: "development",
            original_requirement: original_requirement
          )
        end
      end

      def self.parse_manifest(file_contents, options: {}) # rubocop:disable Lint/UnusedMethodArgument
        manifest = JSON.parse file_contents
        map_dependencies(manifest, "require", "runtime") +
        map_dependencies(manifest, "require-dev", "development")
      end

      # Drupal hosts its own Composer repository, where its "modules" are indexed and searchable. The best way to
      # confirm that Drupal's repo is being used is if its in the "repositories" in composer.json
      # (https://support.acquia.com/hc/en-us/articles/360048081273-Using-Composer-to-manage-dependencies-in-Drupal-8-and-9),
      # but you may only have composer.lock, so we test if the type is "drupal-*" (e.g. "drupal-module" or "drupal-theme")
      # The Drupal team also setup its own mapper of Composer semver -> Drupal tool-specfic versions
      # (https://www.drupal.org/project/project_composer/issues/2622450),
      # so we return the Drupal requirement instead of semver requirement if it's here
      # (https://www.drupal.org/docs/develop/using-composer/using-composer-to-install-drupal-and-manage-dependencies#s-about-semantic-versioning)
      private_class_method def self.is_drupal_module(dependency)
        dependency["type"] =~ /drupal/ && dependency.dig("source", "reference")
      end
    end
  end
end