/**
 * 路由契约的形状(编码规范 §8.1 / §9.2)。
 *
 * 前端只经 `shared/typed-fetch` + 本目录的路由契约与服务端交互;组件内禁止裸 fetch。
 * **禁止 Hono RPC 客户端** —— 它要求前端 import 后端类型,违反 §5.1。
 */
import type { z } from 'zod';

export const HTTP_METHODS = ['GET', 'POST', 'PUT', 'PATCH', 'DELETE'] as const;
export type HttpMethod = (typeof HTTP_METHODS)[number];

/**
 * 一条路由契约。`path` 用 `:name` 表示路径参数,与 `params` 的键一一对应。
 * body 只在 POST/PATCH 上有意义;GET 用 query。
 */
export type RouteContract<
  TParams extends z.ZodTypeAny = z.ZodTypeAny,
  TQuery extends z.ZodTypeAny = z.ZodTypeAny,
  TBody extends z.ZodTypeAny = z.ZodTypeAny,
  TOutput extends z.ZodTypeAny = z.ZodTypeAny,
> = {
  readonly method: HttpMethod;
  readonly path: string;
  readonly params?: TParams;
  readonly query?: TQuery;
  readonly body?: TBody;
  readonly output: TOutput;
};

export type RouteOutput<R extends RouteContract> = z.infer<R['output']>;
export type RouteBody<R extends RouteContract> = R['body'] extends z.ZodTypeAny
  ? z.infer<R['body']>
  : never;

/** 结构化错误:前端按 code 分辨,不解析文案 */
export const API_ERROR_CODES = [
  'unauthenticated',
  'forbidden',
  'not-found',
  'validation-failed',
  'conflict',
  'precondition-failed',
  'internal',
] as const;
export type ApiErrorCode = (typeof API_ERROR_CODES)[number];

export type ApiError = {
  readonly code: ApiErrorCode;
  readonly message: string;
  readonly detail?: unknown;
};