import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';

import { MemberWorkSyncEventQueue } from '@features/member-work-sync/main/infrastructure/MemberWorkSyncEventQueue';

describe('MemberWorkSyncEventQueue', () => {
  beforeEach(() => {
    vi.useFakeTimers();
  });

  afterEach(() => {
    vi.useRealTimers();
  });

  it('coalesces duplicate member events into one queue reconcile', async () => {
    const reconciles: unknown[] = [];
    const auditEvents: string[] = [];
    const queue = new MemberWorkSyncEventQueue({
      quietWindowMs: 100,
      reconcile: async (request, context) => {
        reconciles.push({ request, context });
      },
      isTeamActive: () => true,
      auditJournal: {
        append: async (event) => {
          auditEvents.push(event.event);
        },
      },
    });

    queue.enqueue({ teamName: 'team-a', memberName: 'bob', triggerReason: 'task_changed' });
    queue.enqueue({ teamName: 'team-a', memberName: 'bob', triggerReason: 'inbox_changed' });

    await vi.advanceTimersByTimeAsync(100);

    expect(reconciles).toHaveLength(1);
    expect(reconciles[0]).toMatchObject({
      request: { teamName: 'team-a', memberName: 'bob' },
      context: {
        reconciledBy: 'queue',
        triggerReasons: ['inbox_changed', 'task_changed'],
      },
    });
    expect(queue.getDiagnostics()).toMatchObject({ reconciled: 1, coalesced: 1 });
    expect(auditEvents).toEqual(['queue_enqueued', 'queue_coalesced', 'queue_reconciled']);
    await queue.stop();
  });

  it('bounds coalescing so noisy event streams cannot starve reconcile forever', async () => {
    const reconciles: unknown[] = [];
    const queue = new MemberWorkSyncEventQueue({
      quietWindowMs: 100,
      triggerTiming: {
        task_changed: { runAfterMs: 100, maxCoalesceWaitMs: 250 },
      },
      reconcile: async (request, context) => {
        reconciles.push({ request, context });
      },
      isTeamActive: () => true,
    });

    queue.enqueue({ teamName: 'team-a', memberName: 'bob', triggerReason: 'task_changed' });
    await vi.advanceTimersByTimeAsync(90);
    queue.enqueue({ teamName: 'team-a', memberName: 'bob', triggerReason: 'task_changed' });
    await vi.advanceTimersByTimeAsync(90);
    queue.enqueue({ teamName: 'team-a', memberName: 'bob', triggerReason: 'task_changed' });
    await vi.advanceTimersByTimeAsync(69);

    expect(reconciles).toHaveLength(0);
    expect(queue.getDiagnostics()).toMatchObject({
      queued: 1,
      queuedItems: [
        {
          memberName: 'bob',
          triggerReasonCounts: { task_changed: 3 },
        },
      ],
    });

    await vi.advanceTimersByTimeAsync(1);

    expect(reconciles).toHaveLength(1);
    await queue.stop();
  });

  it('lets manual refresh expedite an already queued delayed reconcile', async () => {
    const reconciles: unknown[] = [];
    const queue = new MemberWorkSyncEventQueue({
      triggerTiming: {
        task_changed: { runAfterMs: 1_000, maxCoalesceWaitMs: 5_000 },
        manual_refresh: { runAfterMs: 0, maxCoalesceWaitMs: 0 },
      },
      reconcile: async (request, context) => {
        reconciles.push({ request, context });
      },
      isTeamActive: () => true,
    });

    queue.enqueue({ teamName: 'team-a', memberName: 'bob', triggerReason: 'task_changed' });
    await vi.advanceTimersByTimeAsync(100);
    queue.enqueue({ teamName: 'team-a', memberName: 'bob', triggerReason: 'manual_refresh' });
    await vi.advanceTimersByTimeAsync(1);

    expect(reconciles).toHaveLength(1);
    expect(reconciles[0]).toMatchObject({
      context: { triggerReasons: ['manual_refresh', 'task_changed'] },
    });
    await queue.stop();
  });

  it('does not let legacy quiet window override delay manual refresh', async () => {
    const reconciles: unknown[] = [];
    const queue = new MemberWorkSyncEventQueue({
      quietWindowMs: 10_000,
      reconcile: async (request, context) => {
        reconciles.push({ request, context });
      },
      isTeamActive: () => true,
    });

    queue.enqueue({ teamName: 'team-a', memberName: 'bob', triggerReason: 'manual_refresh' });
    await vi.advanceTimersByTimeAsync(1);

    expect(reconciles).toHaveLength(1);
    await queue.stop();
  });

  it('uses explicit fast timing for proof-missing recovery triggers', async () => {
    const reconciles: unknown[] = [];
    const queue = new MemberWorkSyncEventQueue({
      reconcile: async (request, context) => {
        reconciles.push({ request, context });
      },
      isTeamActive: () => true,
    });

    queue.enqueue({
      teamName: 'team-a',
      memberName: 'bob',
      triggerReason: 'proof_missing_recovery',
    });

    await vi.advanceTimersByTimeAsync(4_999);
    expect(reconciles).toHaveLength(0);

    await vi.advanceTimersByTimeAsync(1);
    expect(reconciles).toHaveLength(1);
    expect(reconciles[0]).toMatchObject({
      context: { triggerReasons: ['proof_missing_recovery'] },
    });
    await queue.stop();
  });

  it('passes proof-missing recovery context into queued reconcile', async () => {
    const reconciles: unknown[] = [];
    const queue = new MemberWorkSyncEventQueue({
      reconcile: async (request, context) => {
        reconciles.push({ request, context });
      },
      isTeamActive: () => true,
    });

    queue.enqueue({
      teamName: 'team-a',
      memberName: 'bob',
      triggerReason: 'proof_missing_recovery',
      runAfterMs: 0,
      recovery: {
        kind: 'proof_missing',
        intentKey: 'proof-missing:message-1',
        originalMessageId: 'message-1',
        taskIds: ['task-a'],
      },
    });

    await vi.advanceTimersByTimeAsync(1);

    expect(reconciles).toHaveLength(1);
    expect(reconciles[0]).toMatchObject({
      request: { teamName: 'team-a', memberName: 'bob' },
      context: {
        reconciledBy: 'queue',
        triggerReasons: ['proof_missing_recovery'],
        recovery: {
          kind: 'proof_missing',
          intentKey: 'proof-missing:message-1',
          originalMessageId: 'message-1',
          taskIds: ['task-a'],
        },
      },
    });
    await queue.stop();
  });

  it('does not let a later quiet-window event delay a queued manual refresh', async () => {
    const reconciles: unknown[] = [];
    const queue = new MemberWorkSyncEventQueue({
      triggerTiming: {
        task_changed: { runAfterMs: 1_000, maxCoalesceWaitMs: 5_000 },
      },
      reconcile: async (request, context) => {
        reconciles.push({ request, context });
      },
      isTeamActive: () => true,
    });

    queue.enqueue({ teamName: 'team-a', memberName: 'bob', triggerReason: 'manual_refresh' });
    queue.enqueue({ teamName: 'team-a', memberName: 'bob', triggerReason: 'task_changed' });
    await vi.advanceTimersByTimeAsync(1);

    expect(reconciles).toHaveLength(1);
    expect(reconciles[0]).toMatchObject({
      context: { triggerReasons: ['manual_refresh', 'task_changed'] },
    });
    await queue.stop();
  });

  it('drops queued work for inactive teams without reconciling', async () => {
    const reconcile = vi.fn();
    const queue = new MemberWorkSyncEventQueue({
      quietWindowMs: 1,
      reconcile,
      isTeamActive: () => false,
    });

    queue.enqueue({ teamName: 'team-a', memberName: 'bob', triggerReason: 'task_changed' });
    await vi.advanceTimersByTimeAsync(1);

    expect(reconcile).not.toHaveBeenCalled();
    expect(queue.getDiagnostics()).toMatchObject({ dropped: 1, reconciled: 0 });
    await queue.stop();
  });

  it('runs one follow-up pass when events arrive during an active reconcile', async () => {
    let release: () => void = () => {
      throw new Error('reconcile did not start');
    };
    const reconciles: unknown[] = [];
    const queue = new MemberWorkSyncEventQueue({
      quietWindowMs: 1,
      reconcile: async (request, context) => {
        reconciles.push({ request, context });
        if (reconciles.length === 1) {
          await new Promise<void>((resolve) => {
            release = resolve;
          });
        }
      },
      isTeamActive: () => true,
    });

    queue.enqueue({ teamName: 'team-a', memberName: 'bob', triggerReason: 'task_changed' });
    await vi.advanceTimersByTimeAsync(1);
    queue.enqueue({ teamName: 'team-a', memberName: 'bob', triggerReason: 'tool_finished' });

    release();
    await vi.advanceTimersByTimeAsync(1);

    expect(reconciles).toHaveLength(2);
    expect(reconciles[1]).toMatchObject({
      context: { reconciledBy: 'queue', triggerReasons: ['task_changed', 'tool_finished'] },
    });
    await queue.stop();
  });

  it('lets manual refresh request an immediate follow-up after an active reconcile', async () => {
    let release: () => void = () => {
      throw new Error('reconcile did not start');
    };
    const reconciles: unknown[] = [];
    const queue = new MemberWorkSyncEventQueue({
      reconcile: async (request, context) => {
        reconciles.push({ request, context });
        if (reconciles.length === 1) {
          await new Promise<void>((resolve) => {
            release = resolve;
          });
        }
      },
      isTeamActive: () => true,
    });

    queue.enqueue({
      teamName: 'team-a',
      memberName: 'bob',
      triggerReason: 'config_changed',
      runAfterMs: 0,
    });
    await vi.advanceTimersByTimeAsync(0);
    queue.enqueue({ teamName: 'team-a', memberName: 'bob', triggerReason: 'manual_refresh' });

    release();
    await vi.advanceTimersByTimeAsync(1);

    expect(reconciles).toHaveLength(2);
    expect(reconciles[1]).toMatchObject({
      context: { triggerReasons: ['config_changed', 'manual_refresh'] },
    });
    await queue.stop();
  });

  it('does not let a later event delay a due item waiting behind concurrency', async () => {
    let release: () => void = () => {
      throw new Error('reconcile did not start');
    };
    const reconciles: unknown[] = [];
    const queue = new MemberWorkSyncEventQueue({
      concurrency: 1,
      triggerTiming: {
        task_changed: { runAfterMs: 0, maxCoalesceWaitMs: 5_000 },
        inbox_changed: { runAfterMs: 1_000, maxCoalesceWaitMs: 5_000 },
      },
      reconcile: async (request, context) => {
        reconciles.push({ request, context });
        if (reconciles.length === 1) {
          await new Promise<void>((resolve) => {
            release = resolve;
          });
        }
      },
      isTeamActive: () => true,
    });

    queue.enqueue({ teamName: 'team-a', memberName: 'alice', triggerReason: 'task_changed' });
    queue.enqueue({ teamName: 'team-a', memberName: 'bob', triggerReason: 'task_changed' });
    await vi.advanceTimersByTimeAsync(0);

    queue.enqueue({ teamName: 'team-a', memberName: 'bob', triggerReason: 'inbox_changed' });
    release();
    await vi.advanceTimersByTimeAsync(1);

    expect(reconciles).toHaveLength(2);
    expect(reconciles[1]).toMatchObject({
      request: { memberName: 'bob' },
      context: { triggerReasons: ['inbox_changed', 'task_changed'] },
    });
    await queue.stop();
  });

  it('does not spin timers while concurrency is saturated', async () => {
    let release: () => void = () => {
      throw new Error('reconcile did not start');
    };
    const reconciles: unknown[] = [];
    const queue = new MemberWorkSyncEventQueue({
      quietWindowMs: 1,
      concurrency: 1,
      reconcile: async (request) => {
        reconciles.push(request);
        if (reconciles.length === 1) {
          await new Promise<void>((resolve) => {
            release = resolve;
          });
        }
      },
      isTeamActive: () => true,
    });

    queue.enqueue({ teamName: 'team-a', memberName: 'alice', triggerReason: 'task_changed' });
    queue.enqueue({ teamName: 'team-a', memberName: 'bob', triggerReason: 'task_changed' });

    await vi.advanceTimersByTimeAsync(1);
    await vi.advanceTimersByTimeAsync(1_000);

    expect(reconciles).toHaveLength(1);
    expect(queue.getDiagnostics()).toMatchObject({ queued: 1, running: 1 });

    release();
    await vi.advanceTimersByTimeAsync(1);

    expect(reconciles).toHaveLength(2);
    await queue.stop();
  });
});