import { describe, expect, it } from "bun:test";

import { FrontendActionCoordinator, FrontendActionError } from "../../src/frontendAction/coordinator.js";
import type { FrontendActionRequest } from "../../src/frontendAction/types.js";

const start = (coordinator: FrontendActionCoordinator, sessionId = "session-1") => {
  let emitted: FrontendActionRequest | undefined;
  coordinator.registerSink(sessionId, (request) => { emitted = request; });
  const pending = coordinator.request({ sessionId, toolCallId: "call-1", name: "zoom_to_map", params: { x: 117.2, y: 39.1 } });
  if (!emitted) throw new Error("request was not emitted");
  return { emitted, pending };
};

describe("FrontendActionCoordinator", () => {
  it("emits once and resolves with a validated browser result", async () => {
    const coordinator = new FrontendActionCoordinator();
    const { emitted, pending } = start(coordinator);
    const result = { version: "frontend-action-result@1" as const, actionId: emitted.actionId, status: "succeeded" as const, output: { zoom: 14 }, completedAt: Date.now() };
    expect(coordinator.submitResult("session-1", result).duplicate).toBe(false);
    expect((await pending).output).toEqual({ zoom: 14 });
    expect(coordinator.submitResult("session-1", result).duplicate).toBe(true);
  });

  it("rejects conflicting terminal results and cross-session submissions", async () => {
    const coordinator = new FrontendActionCoordinator();
    const { emitted, pending } = start(coordinator);
    const result = { version: "frontend-action-result@1" as const, actionId: emitted.actionId, status: "succeeded" as const, output: {}, completedAt: Date.now() };
    expect(() => coordinator.submitResult("other", result)).toThrow("session mismatch");
    coordinator.submitResult("session-1", result);
    await pending;
    expect(() => coordinator.submitResult("session-1", { ...result, completedAt: result.completedAt + 1 })).toThrow("conflicts");
  });

  it("cancels all pending actions for a session", async () => {
    const coordinator = new FrontendActionCoordinator();
    const { pending } = start(coordinator);
    coordinator.cancelSession("session-1");
    expect((await pending).status).toBe("cancelled");
  });

  it("validates params and requires an active browser sink", () => {
    const coordinator = new FrontendActionCoordinator();
    expect(() => coordinator.request({ sessionId: "s", toolCallId: "c", name: "zoom_to_map", params: { x: "bad", y: 1 } })).toThrow(FrontendActionError);
    coordinator.registerSink("s", () => undefined);
    expect(() => coordinator.request({ sessionId: "s", toolCallId: "c", name: "unknown", params: {} })).toThrow("unknown frontend action");
  });

  it("requires a valid time range when opening history data", async () => {
    const coordinator = new FrontendActionCoordinator();
    let emitted: FrontendActionRequest | undefined;
    coordinator.registerSink("s", (request) => { emitted = request; });
    expect(() => coordinator.request({
      sessionId: "s",
      toolCallId: "c",
      name: "view_history",
      params: { feature_infos: [["node-1", "junction"]], data_type: "realtime" },
    })).toThrow("invalid frontend action params");
    expect(() => coordinator.request({
      sessionId: "s",
      toolCallId: "c",
      name: "view_history",
      params: {
        feature_infos: [["node-1", "junction"]],
        data_type: "realtime",
        start_time: "2026-07-14T00:00:00Z",
        end_time: "2026-07-14T00:00:00Z",
      },
    })).toThrow("invalid frontend action params");
    const pending = coordinator.request({
      sessionId: "s",
      toolCallId: "c",
      name: "view_history",
      params: {
        feature_infos: [["node-1", "junction"]],
        data_type: "realtime",
        start_time: "2026-07-14T00:00:00Z",
        end_time: "2026-07-14T01:00:00Z",
      },
    });
    if (!emitted) throw new Error("request was not emitted");
    coordinator.submitResult("s", {
      version: "frontend-action-result@1",
      actionId: emitted.actionId,
      status: "succeeded",
      output: { component: "HistoryPanel", rendered: true, itemCount: 1 },
      completedAt: Date.now(),
    });
    await expect(pending).resolves.toMatchObject({ status: "succeeded" });
  });
});