frontend/src/api.ts

import type { AdminModelsSnapshot, WorldSnapshot } from "./types";

const API_BASE = import.meta.env.VITE_WORLD_SIMULATOR_API ?? defaultApiBase();
const ADMIN_TOKEN_STORAGE_KEY = "world-simulator-admin-token";

function defaultApiBase(): string {
  if (window.location.hostname === "127.0.0.1" && window.location.port === "5173") {
    return "http://127.0.0.1:8000";
  }
  return window.location.origin;
}

export class ApiResponseError extends Error {
  readonly status: number;

  constructor(message: string, status: number) {
    super(message);
    this.name = "ApiResponseError";
    this.status = status;
  }
}

export async function fetchWorldSnapshot(
  signal?: AbortSignal,
  options: { warmup?: boolean } = {},
): Promise<WorldSnapshot> {
  const url = new URL(`${API_BASE}/scene/state`, window.location.origin);
  if (options.warmup) {
    url.searchParams.set("warmup", "1");
  }

  const response = await fetch(url, { signal });
  if (!response.ok) {
    throw new ApiResponseError(`World snapshot failed: ${response.status}`, response.status);
  }
  return (await response.json()) as WorldSnapshot;
}

export async function tickWorld(): Promise<void> {
  const response = await fetch(`${API_BASE}/tick`, { method: "POST" });
  if (!response.ok) {
    throw new ApiResponseError(`World tick failed: ${response.status}`, response.status);
  }
}

export async function fetchAdminModels(signal?: AbortSignal): Promise<AdminModelsSnapshot> {
  const response = await fetch(`${API_BASE}/admin/models`, {
    headers: adminHeaders(),
    signal,
  });
  if (!response.ok) {
    throw new ApiResponseError(`Model profiles failed: ${response.status}`, response.status);
  }
  return (await response.json()) as AdminModelsSnapshot;
}

export async function setNpcModelProfile(npcId: string, profileId: string): Promise<void> {
  const response = await fetch(`${API_BASE}/admin/npcs/${encodeURIComponent(npcId)}/model`, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      ...adminHeaders(),
    },
    body: JSON.stringify({ profile_id: profileId }),
  });
  if (!response.ok) {
    throw new ApiResponseError(`NPC model switch failed: ${response.status}`, response.status);
  }
}

function adminHeaders(): Record<string, string> {
  return {
    "X-Admin-Token": adminToken(),
  };
}

function adminToken(): string {
  return (
    import.meta.env.VITE_WORLD_SIMULATOR_ADMIN_TOKEN ||
    window.localStorage.getItem(ADMIN_TOKEN_STORAGE_KEY) ||
    "dev-admin-token"
  );
}