import type { HttpResult, HttpSpec, Transport, WsSession, WsSpec } from "@opsxdb/core";
import { browserTransport } from "./browser";

/**
 * HTTP goes through Gin POST /v1/proxy/http.
 * WS (MVP): falls back to browser WebSocket — custom headers require
 * desktop/Gin tunnel later (Week 2).
 */
export function ginProxyTransport(baseUrl: string): Transport {
  const root = baseUrl.replace(/\/$/, "");

  return {
    async http(spec: HttpSpec): Promise<HttpResult> {
      const res = await fetch(`${root}/v1/proxy/http`, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(spec),
      });
      if (!res.ok) {
        const text = await res.text();
        throw new Error(`gin-proxy HTTP ${res.status}: ${text}`);
      }
      return (await res.json()) as HttpResult;
    },

    ws(spec: WsSpec): WsSession {
      // TODO(week2): custom headers need desktop/Gin WS tunnel.
      // For MVP, fall back to browser WebSocket (no custom headers).
      console.warn(
        "[opsxdb/transport] gin-proxy WS falls back to browser WebSocket; custom headers need desktop/Gin tunnel later",
      );
      return browserTransport.ws(spec);
    },
  };
}