import type { JsonRecord, JsonValue } from "../common/types.js";
import { AgentRunError } from "../common/errors.js";

export class ManagerClient {
  constructor(readonly baseUrl: string) {}

  async get(path: string): Promise<JsonValue> {
    return this.request("GET", path);
  }

  async post(path: string, body: JsonValue): Promise<JsonValue> {
    return this.request("POST", path, body);
  }

  async put(path: string, body: JsonValue): Promise<JsonValue> {
    return this.request("PUT", path, body);
  }

  async patch(path: string, body: JsonValue): Promise<JsonValue> {
    return this.request("PATCH", path, body);
  }

  async delete(path: string): Promise<JsonValue> {
    return this.request("DELETE", path);
  }

  private async request(method: string, path: string, body?: JsonValue): Promise<JsonValue> {
    const init: RequestInit = { method };
    if (body !== undefined) {
      init.headers = { "content-type": "application/json" };
      init.body = JSON.stringify(body);
    }
    const response = await fetch(new URL(path, this.baseUrl), init);
    const text = await response.text();
    if (text.trim().length === 0) throw new AgentRunError("infra-failed", `manager returned empty response for ${method} ${path}`, { httpStatus: 502 });
    const envelope = JSON.parse(text) as JsonRecord;
    if (envelope.ok !== true) throw new AgentRunError(typeof envelope.failureKind === "string" ? envelope.failureKind as never : "infra-failed", typeof envelope.message === "string" ? envelope.message : `manager request failed: ${method} ${path}`, { httpStatus: response.status, details: envelope });
    return envelope.data ?? null;
  }
}