/**
 * 日志拦截器
 *
 * 在开发模式下记录请求/响应/错误日志。
 * 原始 Dart: lib/core/net/interceptor/app_interceptor.dart 中的日志部分。
 */
import type { FetchHook } from "ofetch";

const TAG = "[API]";

function isDev(): boolean {
  return process.env.NODE_ENV !== "production";
}

function getRequestUrl(request: Request | string): string {
  return typeof request === "string" ? request : request.url;
}

function getRequestMethod(
  request: Request | string,
  options: { method?: string }
): string {
  return request instanceof Request ? request.method : options.method ?? "GET";
}

function formatBody(body: unknown): string {
  if (body === undefined || body === null) return "";
  try {
    if (body instanceof FormData) {
      const entries: string[] = [];
      body.forEach((value, key) => {
        if (value instanceof File) {
          entries.push(`${key}=File(${value.name})`);
        } else {
          entries.push(`${key}=${String(value)}`);
        }
      });
      return `FormData{${entries.join(", ")}}`;
    }
    return JSON.stringify(body);
  } catch {
    return String(body);
  }
}

export const onRequestLogging: FetchHook = async (ctx) => {
  if (!isDev()) return;
  const method = getRequestMethod(ctx.request, ctx.options);
  const url = getRequestUrl(ctx.request);
  console.log(
    `${TAG} → ${method} ${url}`,
    ctx.options.body !== undefined ? formatBody(ctx.options.body) : ""
  );
};

export const onResponseLogging: FetchHook = async (ctx) => {
  if (!isDev() || !ctx.response) return;
  const method = getRequestMethod(ctx.request, ctx.options);
  const url = getRequestUrl(ctx.request);
  console.log(
    `${TAG} ← ${ctx.response.status} ${method} ${url}`,
    formatBody(ctx.response._data)
  );
};

export const onErrorLogging: FetchHook = async (ctx) => {
  if (!isDev()) return;
  const status = ctx.response?.status ?? "N/A";
  const method = getRequestMethod(ctx.request, ctx.options);
  const url = getRequestUrl(ctx.request);
  console.error(
    `${TAG} ✕ ${status} ${method} ${url}`,
    ctx.error?.message ?? "Unknown error"
  );
};

/**
 * 兼容旧接口的 FetchHooks 形式（保留以备兼容）
 */
export const loggingInterceptor = {
  onRequest: onRequestLogging,
  onResponse: onResponseLogging,
  onResponseError: onErrorLogging,
  onRequestError: onErrorLogging,
};