import { baseApi } from '@ema-platform/api';
import type {
  Exam,
  ListResponse,
  CreateExamPayload,
  UpdateExamPayload,
  AssignQuestionsPayload,
  RandomQuestionsPayload,
  ExamRegistration,
  RecordAttendancePayload,
  ExamIncident,
  CreateIncidentPayload,
  ResolveIncidentPayload,
  RegradeOutcome,
  GradingSheet,
} from '../types/exam';

const examApi = baseApi.injectEndpoints({
  endpoints: (builder) => ({
    getExams: builder.query<ListResponse<Exam>, void>({
      query: () => '/exams?q=i=questions',
      providesTags: ['Api'],
    }),
    getExam: builder.query<Exam, string>({
      // Nested relation so CHOICE questions carry their options here too —
      // needed to print real answer choices instead of blank A/B/C/D lines.
      query: (id) => `/exams/${id}?i=questions,questions.options`,
      providesTags: ['Api'],
    }),
    createExam: builder.mutation<Exam, CreateExamPayload>({
      query: (body) => ({ url: '/exams', method: 'POST', body }),
      invalidatesTags: ['Api'],
    }),
    updateExam: builder.mutation<Exam, UpdateExamPayload>({
      query: ({ id, ...body }) => ({
        url: `/exams/${id}`,
        method: 'PUT',
        body,
      }),
      invalidatesTags: ['Api'],
    }),
    deleteExam: builder.mutation<void, string>({
      query: (id) => ({ url: `/exams/${id}`, method: 'DELETE' }),
      invalidatesTags: ['Api'],
    }),
    assignQuestions: builder.mutation<Exam, AssignQuestionsPayload>({
      query: ({ examId, questionIds, remark }) => ({
        url: `/exams/${examId}/questions`,
        method: 'POST',
        body: { examId, questionIds, remark },
      }),
      invalidatesTags: ['Api'],
    }),
    /** Server-side draw from the approved bank (US-EXAM-005). */
    selectRandomQuestions: builder.mutation<Exam, RandomQuestionsPayload>({
      query: ({ examId, count }) => ({
        url: `/exams/${examId}/questions/random`,
        method: 'POST',
        body: { count },
      }),
      invalidatesTags: ['Api'],
    }),
    // --- Candidates and attendance (US-EXAM-007/009) ---------------------
    getExamRegistrations: builder.query<ExamRegistration[], string>({
      query: (examId) => `/exams/${examId}/registrations`,
      providesTags: ['Api'],
    }),
    recordAttendance: builder.mutation<ExamRegistration, RecordAttendancePayload>({
      query: ({ registrationId, ...body }) => ({
        url: `/exams/registrations/${registrationId}/attendance`,
        method: 'POST',
        body,
      }),
      invalidatesTags: ['Api'],
    }),
    // --- Session incidents (US-EXAM-010) ---------------------------------
    getExamIncidents: builder.query<ExamIncident[], string>({
      query: (examId) => `/exams/${examId}/incidents`,
      providesTags: ['Api'],
    }),
    recordIncident: builder.mutation<ExamIncident, CreateIncidentPayload>({
      query: ({ examId, ...body }) => ({
        url: `/exams/${examId}/incidents`,
        method: 'POST',
        body,
      }),
      invalidatesTags: ['Api'],
    }),
    resolveIncident: builder.mutation<ExamIncident, ResolveIncidentPayload>({
      query: ({ incidentId, ...body }) => ({
        url: `/exams/incidents/${incidentId}/resolve`,
        method: 'POST',
        body,
      }),
      invalidatesTags: ['Api'],
    }),
    /** Staff-triggered re-run of auto-grading for one finalized attempt. */
    regradeAttempt: builder.mutation<RegradeOutcome, string>({
      query: (attemptId) => ({
        url: `/exam-attempts/${attemptId}/regrade`,
        method: 'POST',
      }),
      invalidatesTags: ['Api'],
    }),
    /** The candidate's answers plus auto-computable CHOICE scores, for RecordResultModal. */
    getGradingSheet: builder.query<
      GradingSheet,
      { examId: string; profileId: string }
    >({
      query: ({ examId, profileId }) =>
        `/exam-attempts/exam/${examId}/candidate/${profileId}/grading-sheet`,
      providesTags: ['Api'],
    }),
  }),
  overrideExisting: false,
});

export const {
  useGetExamsQuery,
  useGetExamQuery,
  useCreateExamMutation,
  useUpdateExamMutation,
  useDeleteExamMutation,
  useAssignQuestionsMutation,
  useSelectRandomQuestionsMutation,
  useGetExamRegistrationsQuery,
  useRecordAttendanceMutation,
  useGetExamIncidentsQuery,
  useRecordIncidentMutation,
  useResolveIncidentMutation,
  useRegradeAttemptMutation,
  useGetGradingSheetQuery,
} = examApi;