import type {
  AssignmentCreate,
  AssignmentUpdate,
  AssignmentValidateRequest,
  DayPartCreate,
  DayPartUpdate,
  EditionUpdate,
  LoginRequest,
  MagicLinkRequest,
  PlanningNotificationRequest,
  PositionCreate,
  PositionUpdate,
  ShiftCreate,
  ShiftUpdate,
  VerifyRequest,
  VolunteerCreate,
  VolunteerUpdate,
} from './schema';
import { getAuthToken, notifyUnauthorized } from './session';
import { ApiError, type PlanningApi } from './types';

// Implémentation HTTP réelle. En dev, Vite proxifie `/api` vers le back-end.
export function createHttpApi(baseUrl: string): PlanningApi {
  async function request<T>(path: string, init?: RequestInit): Promise<T> {
    const token = getAuthToken();
    const res = await fetch(`${baseUrl}${path}`, {
      ...init,
      headers: {
        'Content-Type': 'application/json',
        ...(token ? { Authorization: `Bearer ${token}` } : {}),
        ...init?.headers,
      },
      credentials: 'include',
    });

    if (res.status === 204) return undefined as T;

    const isJson = res.headers.get('content-type')?.includes('application/json');
    const body: unknown = isJson ? await res.json() : await res.text();

    if (!res.ok) {
      const detail =
        body && typeof body === 'object' && 'detail' in body
          ? (body as { detail: unknown }).detail
          : body;
      const code =
        detail && typeof detail === 'object' && 'code' in detail
          ? String((detail as { code: unknown }).code)
          : 'error.generic';
      const violations =
        detail && typeof detail === 'object' && 'violations' in detail
          ? ((detail as { violations: [] }).violations ?? [])
          : [];
      if (res.status === 401 && !path.includes('/auth/')) notifyUnauthorized();
      throw new ApiError(res.status, code, violations);
    }
    return body as T;
  }

  const query = (params: Record<string, string | undefined>) => {
    const search = new URLSearchParams();
    for (const [key, value] of Object.entries(params)) {
      if (value != null) search.set(key, value);
    }
    const str = search.toString();
    return str ? `?${str}` : '';
  };

  const base = (editionId: string) => `/editions/${editionId}`;

  return {
    editions: {
      get: (editionId) => request(base(editionId)),
      update: (editionId, body: EditionUpdate) =>
        request(base(editionId), { method: 'PATCH', body: JSON.stringify(body) }),
    },
    dayParts: {
      list: (editionId) => request(`${base(editionId)}/day-parts`),
      create: (editionId, body: DayPartCreate) =>
        request(`${base(editionId)}/day-parts`, { method: 'POST', body: JSON.stringify(body) }),
      update: (editionId, id, body: DayPartUpdate) =>
        request(`${base(editionId)}/day-parts/${id}`, { method: 'PATCH', body: JSON.stringify(body) }),
      remove: (editionId, id) =>
        request(`${base(editionId)}/day-parts/${id}`, { method: 'DELETE' }),
    },
    volunteers: {
      list: (editionId) => request(`${base(editionId)}/volunteers`),
      get: (editionId, id) => request(`${base(editionId)}/volunteers/${id}`),
      create: (editionId, body: VolunteerCreate) =>
        request(`${base(editionId)}/volunteers`, { method: 'POST', body: JSON.stringify(body) }),
      update: (editionId, id, body: VolunteerUpdate) =>
        request(`${base(editionId)}/volunteers/${id}`, { method: 'PATCH', body: JSON.stringify(body) }),
      remove: (editionId, id) =>
        request(`${base(editionId)}/volunteers/${id}`, { method: 'DELETE' }),
    },
    positions: {
      list: (editionId) => request(`${base(editionId)}/positions`),
      get: (editionId, id) => request(`${base(editionId)}/positions/${id}`),
      create: (editionId, body: PositionCreate) =>
        request(`${base(editionId)}/positions`, { method: 'POST', body: JSON.stringify(body) }),
      update: (editionId, id, body: PositionUpdate) =>
        request(`${base(editionId)}/positions/${id}`, { method: 'PATCH', body: JSON.stringify(body) }),
      remove: (editionId, id) =>
        request(`${base(editionId)}/positions/${id}`, { method: 'DELETE' }),
      generateShifts: (editionId, id) =>
        request(`${base(editionId)}/positions/${id}/generate-shifts`, { method: 'POST' }),
    },
    shifts: {
      list: (editionId, params) =>
        request(`${base(editionId)}/shifts${query({ position_id: params?.positionId })}`),
      get: (editionId, id) => request(`${base(editionId)}/shifts/${id}`),
      create: (editionId, body: ShiftCreate) =>
        request(`${base(editionId)}/shifts`, { method: 'POST', body: JSON.stringify(body) }),
      update: (editionId, id, body: ShiftUpdate) =>
        request(`${base(editionId)}/shifts/${id}`, { method: 'PATCH', body: JSON.stringify(body) }),
      remove: (editionId, id) => request(`${base(editionId)}/shifts/${id}`, { method: 'DELETE' }),
    },
    assignments: {
      list: (editionId, params) =>
        request(
          `${base(editionId)}/assignments${query({
            volunteer_id: params?.volunteerId,
            shift_id: params?.shiftId,
          })}`,
        ),
      get: (editionId, id) => request(`${base(editionId)}/assignments/${id}`),
      create: (editionId, body: AssignmentCreate) =>
        request(`${base(editionId)}/assignments`, { method: 'POST', body: JSON.stringify(body) }),
      update: (editionId, id, body: AssignmentUpdate) =>
        request(`${base(editionId)}/assignments/${id}`, { method: 'PATCH', body: JSON.stringify(body) }),
      remove: (editionId, id) =>
        request(`${base(editionId)}/assignments/${id}`, { method: 'DELETE' }),
      validate: (editionId, body: AssignmentValidateRequest) =>
        request(`${base(editionId)}/assignments/validate`, {
          method: 'POST',
          body: JSON.stringify(body),
        }),
    },
    matrix: {
      get: (editionId) => request(`${base(editionId)}/matrix`),
    },
    notifications: {
      sendPlanning: (editionId, body: PlanningNotificationRequest) =>
        request(`${base(editionId)}/notifications/planning`, {
          method: 'POST',
          body: JSON.stringify(body),
        }),
    },
    auth: {
      login: (editionId, body: LoginRequest) =>
        request(`${base(editionId)}/auth/login`, { method: 'POST', body: JSON.stringify(body) }),
      requestMagicLink: (editionId, body: MagicLinkRequest) =>
        request(`${base(editionId)}/auth/magic-link`, { method: 'POST', body: JSON.stringify(body) }),
      verifyMagicLink: (editionId, body: VerifyRequest) =>
        request(`${base(editionId)}/auth/verify`, { method: 'POST', body: JSON.stringify(body) }),
      me: () => request(`/auth/me`),
    },
  };
}