require 'gemnasium/parser'
require 'yaml'

module Bibliothecary
  module Parsers
    class CocoaPods
      include Bibliothecary::Analyser
      extend Bibliothecary::MultiParsers::BundlerLikeManifest

      NAME_VERSION = '(?! )(.*?)(?: \(([^-]*)(?:-(.*))?\))?'.freeze
      NAME_VERSION_4 = /^ {4}#{NAME_VERSION}$/

      def self.mapping
        {
          match_filename("Podfile") => {
            kind: 'manifest',
            parser: :parse_podfile
          },
          match_extension(".podspec") => {
            kind: 'manifest',
            parser: :parse_podspec,
            can_have_lockfile: false
          },
          match_filename("Podfile.lock") => {
            kind: 'lockfile',
            parser: :parse_podfile_lock
          },
          match_extension(".podspec.json") => {
            kind: 'manifest',
            parser: :parse_json_manifest,
            can_have_lockfile: false
          }
        }
      end

      add_multi_parser(Bibliothecary::MultiParsers::DependenciesCSV)

      def self.parse_podfile_lock(file_contents, options: {})
        manifest = YAML.load file_contents
        manifest['PODS'].map do |row|
          pod = row.is_a?(String) ? row : row.keys.first
          match = pod.match(/(.+?)\s\((.+?)\)/i)
          {
            name: match[1].split('/').first,
            requirement: match[2],
            type: 'runtime'
          }
        end.compact
      end

      def self.parse_podspec(file_contents, options: {})
        manifest = Gemnasium::Parser.send(:podspec, file_contents)
        parse_ruby_manifest(manifest)
      end

      def self.parse_podfile(file_contents, options: {})
        manifest = Gemnasium::Parser.send(:podfile, file_contents)
        parse_ruby_manifest(manifest)
      end

      def self.parse_json_manifest(file_contents, options: {})
        manifest = JSON.parse(file_contents)
        manifest['dependencies'].inject([]) do |deps, dep|
          deps.push({
            name: dep[0],
            requirement: dep[1],
            type: 'runtime'
          })
        end.uniq
      end
    end
  end
end