require 'rest-client'

module Codestatus
  module Repositories
    class BitbucketRepository
      BITBUCKET_API_ENDPOINT = 'https://api.bitbucket.org/2.0/' #repositories/atlassian/aui
      def initialize(slug)
        # 'atlassian/aui'
        @slug = slug
      end

      # This combined status is generated by the rule of GitHub's
      #   https://developer.github.com/v3/repos/statuses/#get-the-combined-status-for-a-specific-ref
      def status(ref = main_branch)
        statuses = statuses(ref)

        sha = statuses['values'].map {|x| x.dig('commit', 'hash') }.compact.first
        states = statuses['values'].map { |status| status['state'] }

        state = if states.any? { |x| ['STOPPED', 'FAILED'].include?(x) }
                  BuildStatus::FAILURE
                elsif states.empty? || states.all? { |x| x == 'INPROGRESS' }
                  BuildStatus::PENDING
                elsif states.all? { |x| x == 'SUCCESSFUL' }
                  BuildStatus::SUCCESS
                else
                  BuildStatus::UNDEFINED
                end

        BuildStatus.new(sha: sha, status: state)
      end

      attr_reader :slug

      private

      def main_branch
        repository.dig('mainbranch', 'name')
      end

      def repository
        @repository ||= JSON.parse(client.get(repository_uri))
      end

      def repository_uri
        File.join(BITBUCKET_API_ENDPOINT, 'repositories', slug)
      end

      def client
        RestClient
      end

      # https://developer.atlassian.com/bitbucket/api/2/reference/resource/repositories/%7Busername%7D/%7Brepo_slug%7D/commit/%7Bnode%7D/statuses
      #   example: https://api.bitbucket.org/2.0/repositories/atlassian/aui/commit/master/statuses
      def statuses(ref)
        @statuses ||= JSON.parse(client.get(statuses_uri(ref)))
      end

      def statuses_uri(ref)
        File.join(BITBUCKET_API_ENDPOINT, 'repositories', slug, 'commit', ref, 'statuses')
      end
    end
  end
end