import { beforeEach, describe, expect, it, vi } from "vitest";
import "./executor-test-helpers.js";
import { TaskExecutor } from "../executor.js";
import { createMockStore, resetExecutorMocks } from "./executor-test-helpers.js";

/**
 * FNXC:AgentReflection 2026-07-04-00:00:
 * FN-7528: `signalTaskComplete` is the single seam every executor completion call site routes
 * through. These tests assert the deterministic, non-LLM post-task performance capture fires
 * exactly once per completion (guarded by reflectionService/settings.reflectionEnabled/assigned
 * agent id) and never blocks completion when capture fails.
 */
describe("TaskExecutor post-task reflection capture (FN-7528)", () => {
  beforeEach(() => {
    resetExecutorMocks();
  });

  function makeTask(overrides: Record<string, unknown> = {}) {
    return {
      id: "FN-7528",
      description: "Test task",
      column: "in-review",
      dependencies: [],
      steps: [],
      currentStep: 0,
      log: [],
      assignedAgentId: "agent-1",
      createdAt: new Date().toISOString(),
      updatedAt: new Date().toISOString(),
      ...overrides,
    } as any;
  }

  it("invokes reflectionService.captureTaskPerformance once when reflectionEnabled and an agent is assigned", async () => {
    const store = createMockStore();
    store.getSettings.mockResolvedValue({
      maxConcurrent: 2,
      maxWorktrees: 4,
      pollIntervalMs: 15000,
      groupOverlappingFiles: false,
      autoMerge: false,
      reflectionEnabled: true,
    });

    const captureTaskPerformance = vi.fn().mockResolvedValue(null);
    const executor = new TaskExecutor(store as any, "/tmp/test", {
      reflectionService: { captureTaskPerformance } as any,
    });

    const task = makeTask();
    (executor as any).signalTaskComplete(task);
    // Fire-and-forget: flush the microtask queue.
    await new Promise((resolve) => setImmediate(resolve));

    expect(captureTaskPerformance).toHaveBeenCalledTimes(1);
    expect(captureTaskPerformance).toHaveBeenCalledWith("agent-1", "FN-7528");
  });

  it("does not capture a second time for the same task", async () => {
    const store = createMockStore();
    store.getSettings.mockResolvedValue({ reflectionEnabled: true });

    const captureTaskPerformance = vi.fn().mockResolvedValue(null);
    const executor = new TaskExecutor(store as any, "/tmp/test", {
      reflectionService: { captureTaskPerformance } as any,
    });

    const task = makeTask();
    (executor as any).signalTaskComplete(task);
    (executor as any).signalTaskComplete(task);
    await new Promise((resolve) => setImmediate(resolve));

    expect(captureTaskPerformance).toHaveBeenCalledTimes(1);
  });

  it("skips capture when settings.reflectionEnabled is false", async () => {
    const store = createMockStore();
    store.getSettings.mockResolvedValue({ reflectionEnabled: false });

    const captureTaskPerformance = vi.fn().mockResolvedValue(null);
    const executor = new TaskExecutor(store as any, "/tmp/test", {
      reflectionService: { captureTaskPerformance } as any,
    });

    (executor as any).signalTaskComplete(makeTask());
    await new Promise((resolve) => setImmediate(resolve));

    expect(captureTaskPerformance).not.toHaveBeenCalled();
  });

  it("skips capture when no agent is assigned", async () => {
    const store = createMockStore();
    store.getSettings.mockResolvedValue({ reflectionEnabled: true });

    const captureTaskPerformance = vi.fn().mockResolvedValue(null);
    const executor = new TaskExecutor(store as any, "/tmp/test", {
      reflectionService: { captureTaskPerformance } as any,
    });

    (executor as any).signalTaskComplete(makeTask({ assignedAgentId: undefined }));
    await new Promise((resolve) => setImmediate(resolve));

    expect(captureTaskPerformance).not.toHaveBeenCalled();
  });

  it("never blocks or fails completion when capture throws (best-effort)", async () => {
    const store = createMockStore();
    store.getSettings.mockResolvedValue({ reflectionEnabled: true });

    const captureTaskPerformance = vi.fn().mockRejectedValue(new Error("capture failed"));
    const onComplete = vi.fn();
    const executor = new TaskExecutor(store as any, "/tmp/test", {
      reflectionService: { captureTaskPerformance } as any,
      onComplete,
    });

    expect(() => (executor as any).signalTaskComplete(makeTask())).not.toThrow();
    expect(onComplete).toHaveBeenCalledTimes(1);
    await new Promise((resolve) => setImmediate(resolve));
    expect(captureTaskPerformance).toHaveBeenCalledTimes(1);
  });

  it("still forwards to the configured onComplete callback", async () => {
    const store = createMockStore();
    store.getSettings.mockResolvedValue({ reflectionEnabled: true });

    const onComplete = vi.fn();
    const executor = new TaskExecutor(store as any, "/tmp/test", { onComplete });

    const task = makeTask();
    (executor as any).signalTaskComplete(task);

    expect(onComplete).toHaveBeenCalledWith(task);
  });
});