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

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

const items = [
  { sensor_id: "MP01", level: "high" },
  { sensor_id: "MP02", level: "medium" },
] as const;

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

describe("FrontendActionCoordinator", () => {
  it("registers only the two view-risk SCADA actions with 15 second expiry", () => {
    expect(frontendActionRegistry).toEqual([
      expect.objectContaining({ id: "render_scada_analysis", risk: "view", timeoutMs: 15_000 }),
      expect.objectContaining({ id: "clear_scada_analysis", risk: "view", timeoutMs: 15_000 }),
    ]);
  });

  it("emits once and resolves with validated browser output", async () => {
    const coordinator = new FrontendActionCoordinator();
    const { emitted, pending } = start(coordinator);
    expect(emitted).toMatchObject({
      name: "render_scada_analysis",
      risk: "view",
      replayPolicy: "never",
      params: { items },
    });
    expect(emitted.expiresAt - emitted.issuedAt).toBe(15_000);
    const result = {
      version: "frontend-action-result@1" as const,
      actionId: emitted.actionId,
      status: "succeeded" as const,
      output: {
        rendered_ids: ["MP01", "MP02"],
        missing_ids: [],
        level_counts: { high: 1, medium: 1, low: 0, unrated: 0 },
        fitted: true as const,
      },
      completedAt: Date.now(),
    };
    expect(coordinator.submitResult("session-1", result).duplicate).toBe(false);
    expect((await pending).output).toEqual(result.output);
    expect(coordinator.submitResult("session-1", result).duplicate).toBe(true);
  });

  it("does not replay never-policy actions when the browser sink reconnects", async () => {
    const coordinator = new FrontendActionCoordinator();
    const emitted: FrontendActionRequest[] = [];
    const unregister = coordinator.registerSink("session-1", (request) => emitted.push(request));
    const pending = coordinator.request({
      sessionId: "session-1",
      toolCallId: "call-no-replay",
      name: "clear_scada_analysis",
      params: {},
    });
    unregister();
    coordinator.registerSink("session-1", (request) => emitted.push(request));
    expect(emitted).toHaveLength(1);
    coordinator.submitResult("session-1", {
      version: "frontend-action-result@1",
      actionId: emitted[0].actionId,
      status: "succeeded",
      output: { cleared: true },
      completedAt: Date.now(),
    });
    await pending;
  });

  it("accepts clear output and rejects invalid successful output", async () => {
    const coordinator = new FrontendActionCoordinator();
    const { emitted, pending } = start(coordinator, "clear_scada_analysis", {});
    expect(() => coordinator.submitResult("session-1", {
      version: "frontend-action-result@1",
      actionId: emitted.actionId,
      status: "succeeded",
      output: { cleared: false },
      completedAt: Date.now(),
    })).toThrow("invalid frontend action output");
    coordinator.submitResult("session-1", {
      version: "frontend-action-result@1",
      actionId: emitted.actionId,
      status: "succeeded",
      output: { cleared: true },
      completedAt: Date.now(),
    });
    expect((await pending).output).toEqual({ cleared: true });
  });

  it("validates item count, unique IDs, ID length, and levels", () => {
    const coordinator = new FrontendActionCoordinator();
    coordinator.registerSink("s", () => undefined);
    const request = (value: unknown) => coordinator.request({
      sessionId: "s",
      toolCallId: "call-validation",
      name: "render_scada_analysis",
      params: value,
    });
    expect(() => request({ items: [] })).toThrow(FrontendActionError);
    expect(() => request({ items: Array.from({ length: 101 }, (_, index) => ({ sensor_id: `MP${index}`, level: "low" })) })).toThrow("invalid frontend action params");
    expect(() => request({ items: [{ sensor_id: "MP01", level: "high" }, { sensor_id: "MP01", level: "low" }] })).toThrow("invalid frontend action params");
    expect(() => request({ items: [{ sensor_id: "x".repeat(129), level: "low" }] })).toThrow("invalid frontend action params");
    expect(() => request({ items: [{ sensor_id: "MP01", level: "critical" }] })).toThrow("invalid frontend action params");
  });

  it("keeps terminal results idempotent and rejects conflicts", async () => {
    const coordinator = new FrontendActionCoordinator();
    const { emitted, pending } = start(coordinator, "clear_scada_analysis", {});
    const result = {
      version: "frontend-action-result@1" as const,
      actionId: emitted.actionId,
      status: "succeeded" as const,
      output: { cleared: true as const },
      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");
  });
});