import { ApiHttpClient } from "./ApiHttpClient.js";

export class ChatClientApi {
  constructor(http = new ApiHttpClient(), pollMs = 700, timeoutMs = 120000) {
    this.http = http;
    this.pollMs = pollMs;
    this.timeoutMs = timeoutMs;
  }

  async createDialog(ragSessionId) {
    const response = await this.http.request("/api/chat/dialogs", {
      method: "POST",
      body: JSON.stringify({ rag_session_id: ragSessionId })
    });
    return response.dialog_session_id;
  }

  async sendMessage(payload) {
    const queued = await this.http.request("/api/chat/messages", {
      method: "POST",
      body: JSON.stringify({
        dialog_session_id: payload.dialog_session_id,
        rag_session_id: payload.rag_session_id,
        message: payload.message,
        attachments: payload.attachments || []
      })
    });

    const taskId = queued.task_id;
    const started = Date.now();
    while (Date.now() - started < this.timeoutMs) {
      const status = await this.http.request(`/api/tasks/${encodeURIComponent(taskId)}`);
      if (status.status === "done") return status;
      if (status.status === "error") {
        throw new Error(status.error?.desc || "Task failed");
      }
      await this.#sleep(this.pollMs);
    }
    throw new Error("Task polling timeout");
  }

  #sleep(ms) {
    return new Promise((resolve) => setTimeout(resolve, ms));
  }
}