import type {
  AuthResult,
  Catalog,
  CrisisResource,
  DemoPersona,
  DialogEvent,
  Focus,
  MedsReference,
  Reply,
  Results,
  TodayPlan,
} from "./types";

// Web: same-origin /api/v1 (Vite proxy in dev). Mobile shell: set VITE_API_BASE to the absolute API URL at build.
const BASE: string = import.meta.env.VITE_API_BASE ?? "/api/v1";

export class ApiError extends Error {
  constructor(
    readonly status: number,
    message: string,
  ) {
    super(message);
  }
}

async function request<T>(path: string, init?: RequestInit): Promise<T> {
  let res: Response;
  try {
    res = await fetch(`${BASE}${path}`, {
      ...init,
      headers: { "Content-Type": "application/json", ...init?.headers },
    });
  } catch {
    throw new ApiError(0, "network");
  }
  if (!res.ok) throw new ApiError(res.status, res.statusText);
  return (await res.json()) as T;
}

const post = <T>(path: string, body?: unknown) =>
  request<T>(path, { method: "POST", body: body === undefined ? undefined : JSON.stringify(body) });

export const api = {
  signInEmias: (code: string) => post<AuthResult>("/auth/emias", { code }),
  signInEmiasDemo: (personaToken: string) => post<AuthResult>("/auth/emias/demo", { persona_token: personaToken }),
  signInAnonymous: (focus: Focus) => post<AuthResult>("/auth/anonymous", { focus }),
  demoPersonas: () => request<DemoPersona[]>("/patient/demo-personas"),
  crisisResources: () => request<CrisisResource[]>("/crisis/resources"),
  catalog: () => request<Catalog>("/instruments/catalog"),
  medsReference: () => request<MedsReference>("/meds/reference"),
  today: (token: string) => request<TodayPlan>(`/me/${encodeURIComponent(token)}/today`),
  results: (token: string) => request<Results>(`/me/${encodeURIComponent(token)}/results`),
  sendEvent: async (token: string, event: DialogEvent) =>
    (await post<{ replies: Reply[] }>(`/dialog/${encodeURIComponent(token)}/events`, event)).replies,
  outbox: async (token: string) =>
    (await request<{ replies: Reply[] }>(`/dialog/${encodeURIComponent(token)}/outbox`)).replies,
};