# frozen_string_literal: true

module Sentry
  class Client
    Error = Class.new(StandardError)
    MissingKeysError = Class.new(StandardError)

    attr_accessor :url, :token

    def initialize(api_url, token)
      @url = api_url
      @token = token
    end

    def list_issues(issue_status:, limit:)
      issues = get_issues(issue_status: issue_status, limit: limit)

      handle_mapping_exceptions do
        map_to_errors(issues)
      end
    end

    def list_projects
      projects = get_projects

      handle_mapping_exceptions do
        map_to_projects(projects)
      end
    end

    private

    def handle_mapping_exceptions(&block)
      yield
    rescue KeyError => e
      Gitlab::Sentry.track_acceptable_exception(e)
      raise Client::MissingKeysError, "Sentry API response is missing keys. #{e.message}"
    end

    def request_params
      {
        headers: {
          'Authorization' => "Bearer #{@token}"
        },
        follow_redirects: false
      }
    end

    def http_get(url, params = {})
      response = handle_request_exceptions do
        Gitlab::HTTP.get(url, **request_params.merge(params))
      end

      handle_response(response)
    end

    def get_issues(issue_status:, limit:)
      http_get(issues_api_url, query: {
        query: "is:#{issue_status}",
        limit: limit
      })
    end

    def get_projects
      http_get(projects_api_url)
    end

    def handle_request_exceptions
      yield
    rescue Gitlab::HTTP::Error => e
      Gitlab::Sentry.track_acceptable_exception(e)
      raise_error 'Error when connecting to Sentry'
    rescue Net::OpenTimeout
      raise_error 'Connection to Sentry timed out'
    rescue SocketError
      raise_error 'Received SocketError when trying to connect to Sentry'
    rescue OpenSSL::SSL::SSLError
      raise_error 'Sentry returned invalid SSL data'
    rescue Errno::ECONNREFUSED
      raise_error 'Connection refused'
    rescue => e
      Gitlab::Sentry.track_acceptable_exception(e)
      raise_error "Sentry request failed due to #{e.class}"
    end

    def handle_response(response)
      unless response.code == 200
        raise_error "Sentry response status code: #{response.code}"
      end

      response
    end

    def raise_error(message)
      raise Client::Error, message
    end

    def projects_api_url
      projects_url = URI(@url)
      projects_url.path = '/api/0/projects/'

      projects_url
    end

    def issues_api_url
      issues_url = URI(@url + '/issues/')
      issues_url.path.squeeze!('/')

      issues_url
    end

    def map_to_errors(issues)
      issues.map(&method(:map_to_error))
    end

    def map_to_projects(projects)
      projects.map(&method(:map_to_project))
    end

    def issue_url(id)
      issues_url = @url + "/issues/#{id}"
      issues_url = ErrorTracking::ProjectErrorTrackingSetting.extract_sentry_external_url(issues_url)

      uri = URI(issues_url)
      uri.path.squeeze!('/')

      uri.to_s
    end

    def map_to_error(issue)
      id = issue.fetch('id')

      count = issue.fetch('count', nil)

      frequency = issue.dig('stats', '24h')
      message = issue.dig('metadata', 'value')

      external_url = issue_url(id)

      Gitlab::ErrorTracking::Error.new(
        id: id,
        first_seen: issue.fetch('firstSeen', nil),
        last_seen: issue.fetch('lastSeen', nil),
        title: issue.fetch('title', nil),
        type: issue.fetch('type', nil),
        user_count: issue.fetch('userCount', nil),
        count: count,
        message: message,
        culprit: issue.fetch('culprit', nil),
        external_url: external_url,
        short_id: issue.fetch('shortId', nil),
        status: issue.fetch('status', nil),
        frequency: frequency,
        project_id: issue.dig('project', 'id'),
        project_name: issue.dig('project', 'name'),
        project_slug: issue.dig('project', 'slug')
      )
    end

    def map_to_project(project)
      organization = project.fetch('organization')

      Gitlab::ErrorTracking::Project.new(
        id: project.fetch('id', nil),
        name: project.fetch('name'),
        slug: project.fetch('slug'),
        status: project.dig('status'),
        organization_name: organization.fetch('name'),
        organization_id: organization.fetch('id', nil),
        organization_slug: organization.fetch('slug')
      )
    end
  end
end