import type {
  AccountCreate,
  AccountUpdate,
  ArtistCreate,
  ArtistUpdate,
  AssignmentCreate,
  AssignmentUpdate,
  AssignmentValidateRequest,
  BadgeFieldsSet,
  BadgeGenerateRequest,
  BadgeSizeUpdate,
  DayPartCreate,
  DayPartUpdate,
  EditionUpdate,
  FormFieldsSet,
  FormPaymentOptionCreate,
  FormPaymentOptionUpdate,
  FormTemplateUpdate,
  ImportMapping,
  LoginRequest,
  MagicLinkRequest,
  MecenatInfoSubmit,
  PlanningNotificationRequest,
  PositionCreate,
  PositionSheetsRequest,
  PositionUpdate,
  PublicFormSubmission,
  ShiftCreate,
  ShiftUpdate,
  VerifyRequest,
  VolunteerCreate,
  VolunteerUpdate,
  AttendanceUpdate,
} 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();
    // Pour un envoi `multipart/form-data`, on laisse le navigateur fixer
    // lui-même l'en-tête `Content-Type` (avec la frontière).
    const isForm = init?.body instanceof FormData;
    const res = await fetch(`${baseUrl}${path}`, {
      ...init,
      headers: {
        ...(isForm ? {} : { '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();
      const requestId = res.headers.get('X-Request-ID');
      if (res.status >= 500) {
        console.error(`API ${res.status} ${path} — référence ${requestId ?? '?'}`, detail);
      }
      throw new ApiError(res.status, code, violations, requestId);
    }
    return body as T;
  }

  // Réponses binaires (images du badge, PDF généré) : pas de JSON, on ne
  // veut que les octets (ou `null` pour une image absente, en 404).
  async function requestBlob(path: string, init?: RequestInit): Promise<Blob | null> {
    const token = getAuthToken();
    const isForm = init?.body instanceof FormData;
    const res = await fetch(`${baseUrl}${path}`, {
      ...init,
      headers: {
        ...(isForm ? {} : { 'Content-Type': 'application/json' }),
        ...(token ? { Authorization: `Bearer ${token}` } : {}),
        ...init?.headers,
      },
      credentials: 'include',
    });
    if (res.status === 404) return null;
    if (!res.ok) {
      let code = 'error.generic';
      try {
        const body = (await res.json()) as { detail?: { code?: string } };
        code = body.detail?.code ?? code;
      } catch {
        // Corps non JSON (ex. erreur réseau) : garde le code générique.
      }
      if (res.status === 401) notifyUnauthorized();
      throw new ApiError(res.status, code, [], res.headers.get('X-Request-ID'));
    }
    return res.blob();
  }

  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' }),
    },
    artists: {
      list: (editionId) => request(`${base(editionId)}/artists`),
      create: (editionId, body: ArtistCreate) =>
        request(`${base(editionId)}/artists`, { method: 'POST', body: JSON.stringify(body) }),
      update: (editionId, id, body: ArtistUpdate) =>
        request(`${base(editionId)}/artists/${id}`, { method: 'PATCH', body: JSON.stringify(body) }),
      remove: (editionId, id) =>
        request(`${base(editionId)}/artists/${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' }),
      planning: (editionId, id) =>
        request(`${base(editionId)}/volunteers/${id}/planning`),
      photoBlob: (editionId, id) => requestBlob(`${base(editionId)}/volunteers/${id}/photo`),
      setPhoto: (editionId, id, file: File) => {
        const form = new FormData();
        form.append('file', file);
        return request(`${base(editionId)}/volunteers/${id}/photo`, { method: 'PUT', body: form });
      },
      removePhoto: (editionId, id) =>
        request(`${base(editionId)}/volunteers/${id}/photo`, { method: 'DELETE' }),
      exportXlsx: async (editionId) => {
        const blob = await requestBlob(`${base(editionId)}/volunteers/export`);
        if (!blob) throw new ApiError(500, 'error.generic', []);
        return blob;
      },
      exportMecenatReceipts: async (editionId) => {
        const blob = await requestBlob(`${base(editionId)}/volunteers/mecenat-receipts`);
        if (!blob) throw new ApiError(500, 'error.generic', []);
        return blob;
      },
    },
    accounts: {
      list: (editionId) => request(`${base(editionId)}/accounts`),
      create: (editionId, body: AccountCreate) =>
        request(`${base(editionId)}/accounts`, { method: 'POST', body: JSON.stringify(body) }),
      update: (editionId, id, body: AccountUpdate) =>
        request(`${base(editionId)}/accounts/${id}`, { method: 'PATCH', body: JSON.stringify(body) }),
      remove: (editionId, id) =>
        request(`${base(editionId)}/accounts/${id}`, { method: 'DELETE' }),
    },
    imports: {
      analyze: (editionId, file: File) => {
        const form = new FormData();
        form.append('file', file);
        return request(`${base(editionId)}/import/analyze`, { method: 'POST', body: form });
      },
      execute: (editionId, file: File, mapping: ImportMapping) => {
        const form = new FormData();
        form.append('file', file);
        form.append('mapping', JSON.stringify(mapping));
        return request(`${base(editionId)}/import/execute`, { method: 'POST', body: form });
      },
    },
    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' }),
      setAttendance: (editionId, id, body: AttendanceUpdate) =>
        request(`${base(editionId)}/assignments/${id}/attendance`, {
          method: 'PUT',
          body: JSON.stringify(body),
        }),
      validate: (editionId, body: AssignmentValidateRequest) =>
        request(`${base(editionId)}/assignments/validate`, {
          method: 'POST',
          body: JSON.stringify(body),
        }),
    },
    matrix: {
      get: (editionId) => request(`${base(editionId)}/matrix`),
    },
    stats: {
      get: (editionId) => request(`${base(editionId)}/stats`),
    },
    badges: {
      getTemplate: (editionId) => request(`${base(editionId)}/badges/template`),
      uploadFrontImage: (editionId, file: File) => {
        const form = new FormData();
        form.append('file', file);
        return request(`${base(editionId)}/badges/template/front-image`, {
          method: 'PUT',
          body: form,
        });
      },
      uploadBackImage: (editionId, file: File) => {
        const form = new FormData();
        form.append('file', file);
        return request(`${base(editionId)}/badges/template/back-image`, {
          method: 'PUT',
          body: form,
        });
      },
      frontImageBlob: (editionId) => requestBlob(`${base(editionId)}/badges/template/front-image`),
      backImageBlob: (editionId) => requestBlob(`${base(editionId)}/badges/template/back-image`),
      setFields: (editionId, body: BadgeFieldsSet) =>
        request(`${base(editionId)}/badges/template/fields`, {
          method: 'PUT',
          body: JSON.stringify(body),
        }),
      setSize: (editionId, body: BadgeSizeUpdate) =>
        request(`${base(editionId)}/badges/template/size`, {
          method: 'PUT',
          body: JSON.stringify(body),
        }),
      generate: async (editionId, body: BadgeGenerateRequest) => {
        const blob = await requestBlob(`${base(editionId)}/badges/generate`, {
          method: 'POST',
          body: JSON.stringify(body),
        });
        if (!blob) throw new ApiError(500, 'error.generic', []);
        return blob;
      },
    },
    forms: {
      getTemplate: (editionId) => request(`${base(editionId)}/form`),
      setFields: (editionId, body: FormFieldsSet) =>
        request(`${base(editionId)}/form/fields`, {
          method: 'PUT',
          body: JSON.stringify(body),
        }),
      setOpen: (editionId, body: FormTemplateUpdate) =>
        request(`${base(editionId)}/form`, { method: 'PATCH', body: JSON.stringify(body) }),
      uploadLogo: (editionId, file: File) => {
        const form = new FormData();
        form.append('file', file);
        return request(`${base(editionId)}/form/logo`, { method: 'PUT', body: form });
      },
      regenerateToken: (editionId) =>
        request(`${base(editionId)}/form/regenerate-token`, { method: 'POST' }),
      getPublicConfig: (editionId, token) =>
        request(`${base(editionId)}/form/public?token=${encodeURIComponent(token)}`),
      logoBlob: (editionId, token) =>
        requestBlob(`${base(editionId)}/form/logo?token=${encodeURIComponent(token)}`),
      submitPublic: (editionId, token, body: PublicFormSubmission) => {
        const form = new FormData();
        form.append('access_token', token);
        form.append('first_name', body.first_name);
        form.append('last_name', body.last_name);
        form.append('hcaptcha_token', body.hcaptcha_token);
        if (body.email) form.append('email', body.email);
        if (body.phone) form.append('phone', body.phone);
        if (body.comment) form.append('comment', body.comment);
        if (body.companion_wish_note) form.append('companion_wish_note', body.companion_wish_note);
        if (body.available !== undefined) form.append('available', String(body.available));
        if (body.payment_option_id) form.append('payment_option_id', body.payment_option_id);
        if (body.payment_amount) form.append('payment_amount', body.payment_amount);
        if (body.position_wish_ids) {
          form.append('position_wish_ids', JSON.stringify(body.position_wish_ids));
        }
        if (body.artist_wish_ids) {
          form.append('artist_wish_ids', JSON.stringify(body.artist_wish_ids));
        }
        if (body.photo) form.append('photo', body.photo);
        return request(`${base(editionId)}/form/public/submit`, { method: 'POST', body: form });
      },
      paymentOptions: {
        list: (editionId) => request(`${base(editionId)}/form/payment-options`),
        create: (editionId, body: FormPaymentOptionCreate) =>
          request(`${base(editionId)}/form/payment-options`, {
            method: 'POST',
            body: JSON.stringify(body),
          }),
        update: (editionId, id, body: FormPaymentOptionUpdate) =>
          request(`${base(editionId)}/form/payment-options/${id}`, {
            method: 'PATCH',
            body: JSON.stringify(body),
          }),
        remove: (editionId, id) =>
          request(`${base(editionId)}/form/payment-options/${id}`, { method: 'DELETE' }),
      },
      submitMecenatInfo: (editionId, token, body: MecenatInfoSubmit) =>
        request(`${base(editionId)}/form/public/pending/${token}/mecenat-info`, {
          method: 'POST',
          body: JSON.stringify(body),
        }),
      getPendingStatus: (editionId, token) =>
        request(`${base(editionId)}/form/public/pending/${token}`),
      retryPendingPayment: (editionId, token) =>
        request(`${base(editionId)}/form/public/pending/${token}/retry-payment`, {
          method: 'POST',
        }),
    },
    positionSheets: {
      generate: async (editionId, body: PositionSheetsRequest) => {
        const blob = await requestBlob(`${base(editionId)}/position-sheets/generate`, {
          method: 'POST',
          body: JSON.stringify(body),
        });
        if (!blob) throw new ApiError(500, 'error.generic', []);
        return blob;
      },
    },
    solver: {
      run: (editionId) =>
        request(`${base(editionId)}/solver/suggestions`, { method: 'POST' }),
    },
    notifications: {
      sendPlanning: (editionId, body: PlanningNotificationRequest) =>
        request(`${base(editionId)}/notifications/planning`, {
          method: 'POST',
          body: JSON.stringify(body),
        }),
      sendTest: (editionId, email: string) =>
        request(`${base(editionId)}/notifications/test`, {
          method: 'POST',
          body: JSON.stringify({ email }),
        }),
    },
    auth: {
      login: (editionId, body: LoginRequest) =>
        request(`${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`),
    },
  };
}