# frozen_string_literal: true
require_relative 'asset_type'
require 'singleton'
module KCommercial
  module Resources
    class GitSourceManager
      include Singleton

      # The shared manager
      # @return [CocoaDepot::Resources::GitSourceManager]
      def self.shared
        GitSourceManager.instance
      end

      attr_reader :repos_dir

      def home_dir
        @home_dir ||= Pathname.new(ENV['CP_HOME_DIR'] || '~/.cocoadepot-resources').expand_path
        @home_dir.mkpath unless @home_dir.exist?
        @home_dir
      end

      def repos_dir
        @repos_dir ||= home_dir.join('repos')
        @repos_dir.mkpath unless @repos_dir.exist?
        @repos_dir
      end

      def sources
        @sources ||= {}
      end

      # Get the git source with name or url
      # @param [String] url
      # @return [GitSource]
      def source_with_url(url)
        name = name_for_url(url)
        sources[name] ||= begin
                             path = repos_dir.join(name)
                             GitSource.new(url, path)
                           end
        sources[name]
      end

      # Returns a suitable repository name for `url`.
      #
      # @example A GitHub.com URL
      #
      #          name_for_url('https://github.com/Artsy/Specs.git')
      #            # "artsy"
      #          name_for_url('https://github.com/Artsy/Specs.git')
      #            # "artsy-1"
      #
      # @example A non-Github.com URL
      #
      #          name_for_url('https://sourceforge.org/Artsy/Specs.git')
      #            # sourceforge-artsy-specs
      #
      # @example A file URL
      #
      #           name_for_url('file:///Artsy/Specs.git')
      #             # artsy-specs
      #
      # @param  [#to_s] url
      #         The URL of the source.
      #
      # @return [String] A suitable repository name for `url`.
      #
      def name_for_url(url)
        base_from_host_and_path = lambda do |host, path|
          if host && !host.empty?
            base = host.split('.')[-2] || host
            base += '-'
          else
            base = ''
          end

          base + path.gsub(/.git$/, '').gsub(%r{^/}, '').split('/').join('-')
        end

        case url.to_s.downcase
        when %r{github.com[:/]+(.+)/(.+)}
          base = Regexp.last_match[1]
        when %r{^\S+@(\S+)[:/]+(.+)$}
          host, path = Regexp.last_match.captures
          base = base_from_host_and_path[host, path]
        when URI.regexp
          url = URI(url.downcase)
          base = base_from_host_and_path[url.host, url.path]
        else
          base = url.to_s.downcase
        end

        name = base
        # infinity = 1.0 / 0
        # (1..infinity).each do |i|
        #   break unless source_dir(name).exist?
        #   name = "#{base}-#{i}"
        # end
        name
      end

      # @return [Pathname] The path of the source with the given name.
      #
      # @param  [String] name
      #         The name of the source.
      #
      def source_dir(name)
        repos_dir + name
      end

    end
  end
end