import type { CalendarConnectionStatus, CalendarProvider, ConnectedCalendar } from "../types/calendar";
import type { ChildProfile } from "@family-planner/types";
import type {
  ScheduleUploadResponse,
  IngestionStatusResponse,
  IngestionConfigResponse,
  DiagnoseUploadResponse,
  RepairIngestionResponse,
  ApiSuccessResponse
} from "../types/api";

export const API_BASE_URL =
  import.meta.env.VITE_API_URL ?? "http://localhost:5000/api";

type HttpVerb = "GET" | "POST" | "PATCH" | "DELETE";

async function request<TResponse>(
  path: string,
  method: HttpVerb,
  body?: unknown
): Promise<TResponse> {
  const response = await fetch(`${API_BASE_URL}${path}`, {
    method,
    headers: {
      "Content-Type": "application/json",
      "Cache-Control": "no-cache" // Force le backend à retourner 200 au lieu de 304
    },
    body: body ? JSON.stringify(body) : undefined
  });

  if (!response.ok) {
    throw new Error(`API error ${response.status}`);
  }

  // Gérer 304 Not Modified (pas de body, utiliser le cache navigateur)
  if (response.status === 304) {
    throw new Error("Data not modified (304) - this should not happen with Cache-Control: no-cache");
  }

  if (response.status === 204) {
    return undefined as TResponse;
  }

  const contentLength = response.headers.get("Content-Length");
  if (contentLength === "0" || response.status === 202) {
    return undefined as TResponse;
  }

  const contentType = response.headers.get("Content-Type") ?? "";
  if (!contentType.includes("application/json")) {
    return undefined as TResponse;
  }

  return (await response.json()) as TResponse;
}

export const apiClient = {
  get: <T>(path: string) => request<T>(path, "GET"),
  post: <T>(path: string, payload: unknown) => request<T>(path, "POST", payload),
  patch: <T>(path: string, payload: unknown) => request<T>(path, "PATCH", payload),
  delete: <T>(path: string) => request<T>(path, "DELETE")
};

export const uploadAvatar = async (
  file: File
): Promise<{ url: string; filename: string }> => {
  const formData = new FormData();
  formData.append("avatar", file);

  const response = await fetch(`${API_BASE_URL}/uploads/avatar`, {
    method: "POST",
    body: formData
  });

  if (!response.ok) {
    throw new Error(`Upload error ${response.status}`);
  }

  return (await response.json()) as { url: string; filename: string };
};

export const uploadPlanning = async (
  childId: string,
  file: File
): Promise<ScheduleUploadResponse> => {
  const form = new FormData();
  form.append("childId", childId);
  form.append("planning", file);
  const response = await fetch(`${API_BASE_URL}/uploads/planning`, {
    method: "POST",
    body: form
  });
  if (!response.ok) {
    throw new Error(`Upload planning error ${response.status}`);
  }
  return (await response.json()) as ScheduleUploadResponse;
};

export const listAvatars = async (): Promise<Array<{ filename: string; url: string }>> => {
  const response = await fetch(`${API_BASE_URL}/uploads/avatars`);
  if (!response.ok) {
    throw new Error(`Gallery error ${response.status}`);
  }
  return (await response.json()) as Array<{ filename: string; url: string }>;
};

// Ingestion helper endpoints (proxied via backend)
export const getIngestionStatus = async (): Promise<IngestionStatusResponse> => {
  const response = await fetch(`${API_BASE_URL}/ingestion/status`);
  return (await response.json()) as IngestionStatusResponse;
};

export const getIngestionConfig = async (): Promise<IngestionConfigResponse> => {
  const response = await fetch(`${API_BASE_URL}/ingestion/config`);
  return (await response.json()) as IngestionConfigResponse;
};

export const setOpenAIConfig = async (apiKey: string, model?: string): Promise<ApiSuccessResponse> => {
  const response = await fetch(`${API_BASE_URL}/ingestion/config/openai`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ apiKey, model })
  });
  if (!response.ok) {
    throw new Error("Config update failed");
  }
  return (await response.json()) as ApiSuccessResponse;
};

export const startIngestion = async (): Promise<ApiSuccessResponse> => {
  const response = await fetch(`${API_BASE_URL}/ingestion/start`, { method: "POST" });
  return (await response.json()) as ApiSuccessResponse;
};

export const diagnoseUpload = async (
  file: File
): Promise<DiagnoseUploadResponse> => {
  const form = new FormData();
  form.append("planning", file);
  const resp = await fetch(`${API_BASE_URL}/uploads/diagnose`, { method: "POST", body: form });
  if (!resp.ok) throw new Error("Diagnostic failed");
  return (await resp.json()) as DiagnoseUploadResponse;
};

export const repairIngestion = async (): Promise<RepairIngestionResponse> => {
  const resp = await fetch(`${API_BASE_URL}/ingestion/repair`, { method: "POST" });
  return (await resp.json()) as RepairIngestionResponse;
};

// Parents API
export type ParentPayload = { fullName: string; colorHex: string; email?: string; notes?: string; avatar?: ChildProfile["avatar"] };
export const listParents = async (): Promise<Array<{ id: string; fullName: string; colorHex: string; email?: string; notes?: string; avatar?: ChildProfile["avatar"]; }>> =>
  apiClient.get("/parents");
export const createParent = async (payload: ParentPayload) => apiClient.post("/parents", payload);
export const updateParent = async (parentId: string, payload: Partial<ParentPayload> & { avatar?: ChildProfile["avatar"] | null }) =>
  apiClient.patch(`/parents/${parentId}`, payload);
export const deleteParent = async (parentId: string) => apiClient.delete(`/parents/${parentId}`);

export type GrandParentPayload = ParentPayload;
export const listGrandParents = async (): Promise<Array<{ id: string; fullName: string; colorHex: string; email?: string; notes?: string; avatar?: ChildProfile["avatar"]; }>> =>
  apiClient.get("/grandparents");
export const createGrandParent = async (payload: GrandParentPayload) => apiClient.post("/grandparents", payload);
export const updateGrandParent = async (grandParentId: string, payload: Partial<GrandParentPayload> & { avatar?: ChildProfile["avatar"] | null }) =>
  apiClient.patch(`/grandparents/${grandParentId}`, payload);
export const deleteGrandParent = async (grandParentId: string) => apiClient.delete(`/grandparents/${grandParentId}`);

// Calendar integrations
type CalendarOAuthStartResponse = {
  authUrl?: string;
  url?: string;
  authorizeUrl?: string;
  state?: string;
};

type CalendarOAuthCompleteResponse = {
  success: boolean;
  email?: string;
  label?: string;
  connectionId?: string;
  profileId?: string;
};

export const startCalendarOAuth = async (
  provider: CalendarProvider,
  payload: { profileId: string; state: string }
) => apiClient.post<CalendarOAuthStartResponse>(`/calendar/${provider}/oauth/start`, payload);

export const completeCalendarOAuth = async (payload: {
  provider: CalendarProvider;
  state: string;
  code?: string;
  error?: string;
  profileId?: string;
}) => apiClient.post<CalendarOAuthCompleteResponse>("/calendar/oauth/complete", payload);

export const connectCalendarWithCredentials = async (
  provider: CalendarProvider,
  payload: { profileId: string; email: string; password: string; label?: string; shareWithFamily?: boolean }
) => apiClient.post<{ connection: ConnectedCalendar }>(`/calendar/${provider}/credentials`, payload);

export const listCalendarConnections = async (profileId: string) =>
  apiClient.get<ConnectedCalendar[]>(`/calendar/${profileId}/connections`);

export const refreshCalendarConnection = async (profileId: string, connectionId: string) =>
  apiClient.post<{ status: CalendarConnectionStatus; lastSyncedAt?: string }>(
    `/calendar/${profileId}/connections/${connectionId}/refresh`,
    {}
  );

export const removeCalendarConnection = async (profileId: string, connectionId: string) =>
  apiClient.delete(`/calendar/${profileId}/connections/${connectionId}`);

// Holidays and Personal Leaves API
import type { Holiday, PersonalLeave, SchoolRegion } from "@family-planner/types";

export const getHolidays = async (region?: SchoolRegion, year?: number): Promise<{ holidays: Holiday[] }> => {
  const params = new URLSearchParams();
  if (region) params.append("region", region);
  if (year) params.append("year", year.toString());
  return apiClient.get(`/holidays?${params.toString()}`);
};

export const getPublicHolidays = async (year?: number): Promise<{ holidays: Holiday[] }> => {
  const params = new URLSearchParams();
  if (year) params.append("year", year.toString());
  return apiClient.get(`/holidays/public?${params.toString()}`);
};

export const getSchoolHolidays = async (region?: SchoolRegion, year?: number): Promise<{ holidays: Holiday[] }> => {
  const params = new URLSearchParams();
  if (region) params.append("region", region);
  if (year) params.append("year", year.toString());
  return apiClient.get(`/holidays/school?${params.toString()}`);
};

export const getPersonalLeaves = async (profileId?: string): Promise<{ leaves: PersonalLeave[] }> => {
  const params = new URLSearchParams();
  if (profileId) params.append("profileId", profileId);
  return apiClient.get(`/personal-leaves?${params.toString()}`);
};