/**
 * Quality Review Tests
 *
 * Tests for the quality-review dispatch hook that intercepts agent:stopped
 * events and spawns a review agent when conditions are met.
 */

import { describe, it, expect, vi, beforeEach } from 'vitest';
import { computeQualifyingFiles, shouldRunQualityReview, runQualityReview } from './quality-review.js';
import type { BranchManager } from '../git/branch-manager.js';
import type { AgentRepository } from '../db/repositories/agent-repository.js';
import type { TaskRepository } from '../db/repositories/task-repository.js';
import type { InitiativeRepository } from '../db/repositories/initiative-repository.js';
import type { PhaseRepository } from '../db/repositories/phase-repository.js';
import type { AgentManager } from '../agent/types.js';
import type { createModuleLogger } from '../logger/index.js';

type Logger = ReturnType<typeof createModuleLogger>;

// ---------------------------------------------------------------------------
// Mock helpers
// ---------------------------------------------------------------------------

function createBranchManagerMock(): BranchManager {
  return {
    ensureBranch: vi.fn(),
    mergeBranch: vi.fn(),
    diffBranches: vi.fn(),
    diffBranchesStat: vi.fn().mockResolvedValue([]),
    diffFileSingle: vi.fn(),
    getHeadCommitHash: vi.fn(),
    deleteBranch: vi.fn(),
    branchExists: vi.fn(),
    remoteBranchExists: vi.fn(),
    listCommits: vi.fn(),
    diffCommit: vi.fn(),
    getMergeBase: vi.fn(),
    pushBranch: vi.fn(),
    checkMergeability: vi.fn(),
    fetchRemote: vi.fn(),
    fastForwardBranch: vi.fn(),
    updateRef: vi.fn(),
  } as unknown as BranchManager;
}

function createAgentRepositoryMock(): AgentRepository {
  return {
    findById: vi.fn().mockResolvedValue({ id: 'a1', mode: 'execute' }),
    findByTaskId: vi.fn(),
    findAll: vi.fn(),
    create: vi.fn(),
    update: vi.fn(),
    delete: vi.fn(),
  } as unknown as AgentRepository;
}

function createTaskRepositoryMock(): TaskRepository {
  return {
    findById: vi.fn().mockResolvedValue({
      id: 't1',
      status: 'in_progress',
      initiativeId: 'i1',
      phaseId: 'p1',
    }),
    findByPhaseId: vi.fn(),
    findByInitiativeId: vi.fn(),
    create: vi.fn(),
    update: vi.fn().mockResolvedValue(undefined),
    delete: vi.fn(),
  } as unknown as TaskRepository;
}

function createInitiativeRepositoryMock(): InitiativeRepository {
  return {
    findById: vi.fn().mockResolvedValue({
      id: 'i1',
      qualityReview: true,
      branch: 'cw/test',
    }),
    findAll: vi.fn(),
    findByStatus: vi.fn(),
    create: vi.fn(),
    update: vi.fn(),
    delete: vi.fn(),
  } as unknown as InitiativeRepository;
}

function createPhaseRepositoryMock(): PhaseRepository {
  return {
    findById: vi.fn().mockResolvedValue({ id: 'p1', name: 'impl', initiativeId: 'i1' }),
    findByInitiativeId: vi.fn(),
    create: vi.fn(),
    update: vi.fn(),
    delete: vi.fn(),
  } as unknown as PhaseRepository;
}

function createAgentManagerMock(): AgentManager {
  return {
    spawn: vi.fn().mockResolvedValue({ id: 'review-agent-1' }),
    stop: vi.fn(),
    list: vi.fn(),
    resume: vi.fn(),
    delete: vi.fn(),
    getStatus: vi.fn(),
    answerQuestion: vi.fn(),
    spawnWithLifecycle: vi.fn(),
  } as unknown as AgentManager;
}

function createLoggerMock(): Logger {
  return {
    info: vi.fn(),
    error: vi.fn(),
    warn: vi.fn(),
    debug: vi.fn(),
    trace: vi.fn(),
    fatal: vi.fn(),
    child: vi.fn(),
  } as unknown as Logger;
}

// ---------------------------------------------------------------------------
// computeQualifyingFiles
// ---------------------------------------------------------------------------

describe('computeQualifyingFiles', () => {
  let branchManager: BranchManager;

  beforeEach(() => {
    branchManager = createBranchManagerMock();
  });

  it('includes .ts files', async () => {
    vi.mocked(branchManager.diffBranchesStat).mockResolvedValue([
      { path: 'src/foo.ts', status: 'modified', additions: 5, deletions: 2 },
    ]);
    expect(await computeQualifyingFiles(branchManager, '/repo', 'task-branch', 'base')).toEqual(['src/foo.ts']);
  });

  it('includes .tsx and .js files', async () => {
    vi.mocked(branchManager.diffBranchesStat).mockResolvedValue([
      { path: 'src/Comp.tsx', status: 'modified', additions: 3, deletions: 1 },
      { path: 'src/util.js', status: 'added', additions: 10, deletions: 0 },
    ]);
    const result = await computeQualifyingFiles(branchManager, '/repo', 'task-branch', 'base');
    expect(result).toContain('src/Comp.tsx');
    expect(result).toContain('src/util.js');
  });

  it('excludes *.gen.ts files', async () => {
    vi.mocked(branchManager.diffBranchesStat).mockResolvedValue([
      { path: 'src/routeTree.gen.ts', status: 'modified', additions: 1, deletions: 0 },
    ]);
    expect(await computeQualifyingFiles(branchManager, '/repo', 'branch', 'base')).toEqual([]);
  });

  it('excludes files starting with dist/', async () => {
    vi.mocked(branchManager.diffBranchesStat).mockResolvedValue([
      { path: 'dist/index.js', status: 'modified', additions: 1, deletions: 0 },
    ]);
    expect(await computeQualifyingFiles(branchManager, '/repo', 'branch', 'base')).toEqual([]);
  });

  it('excludes files containing /dist/', async () => {
    vi.mocked(branchManager.diffBranchesStat).mockResolvedValue([
      { path: 'packages/foo/dist/bar.js', status: 'modified', additions: 1, deletions: 0 },
    ]);
    expect(await computeQualifyingFiles(branchManager, '/repo', 'branch', 'base')).toEqual([]);
  });

  it('returns empty array when diffBranchesStat throws', async () => {
    vi.mocked(branchManager.diffBranchesStat).mockRejectedValue(new Error('branch not found'));
    expect(await computeQualifyingFiles(branchManager, '/repo', 'branch', 'base')).toEqual([]);
  });

  it('returns only qualifying files from a mixed set', async () => {
    vi.mocked(branchManager.diffBranchesStat).mockResolvedValue([
      { path: 'src/foo.ts', status: 'modified', additions: 5, deletions: 2 },
      { path: 'src/routeTree.gen.ts', status: 'modified', additions: 1, deletions: 0 },
      { path: 'dist/bundle.js', status: 'modified', additions: 1, deletions: 0 },
      { path: 'src/bar.tsx', status: 'added', additions: 10, deletions: 0 },
      { path: 'README.md', status: 'modified', additions: 2, deletions: 0 },
    ]);
    const result = await computeQualifyingFiles(branchManager, '/repo', 'branch', 'base');
    expect(result).toEqual(['src/foo.ts', 'src/bar.tsx']);
  });
});

// ---------------------------------------------------------------------------
// shouldRunQualityReview
// ---------------------------------------------------------------------------

describe('shouldRunQualityReview', () => {
  let branchManager: BranchManager;
  let agentRepository: AgentRepository;
  let taskRepository: TaskRepository;
  let initiativeRepository: InitiativeRepository;
  let phaseRepository: PhaseRepository;

  // Base params where all conditions pass
  let params: Parameters<typeof shouldRunQualityReview>[0];

  beforeEach(() => {
    branchManager = createBranchManagerMock();
    agentRepository = createAgentRepositoryMock();
    taskRepository = createTaskRepositoryMock();
    initiativeRepository = createInitiativeRepositoryMock();
    phaseRepository = createPhaseRepositoryMock();

    // Default diffBranchesStat returns qualifying file
    vi.mocked(branchManager.diffBranchesStat).mockResolvedValue([
      { path: 'src/foo.ts', status: 'modified', additions: 5, deletions: 2 },
    ]);

    params = {
      agentId: 'a1',
      taskId: 't1',
      stopReason: 'task_complete',
      agentRepository,
      taskRepository,
      initiativeRepository,
      phaseRepository,
      branchManager,
      repoPath: '/repo',
    };
  });

  it('returns false when stopReason is not task_complete', async () => {
    const result = await shouldRunQualityReview({ ...params, stopReason: 'error' });
    expect(result).toEqual({ run: false, qualifyingFiles: [] });
  });

  it('returns false when agent is not found', async () => {
    vi.mocked(agentRepository.findById).mockResolvedValue(undefined as any);
    const result = await shouldRunQualityReview(params);
    expect(result).toEqual({ run: false, qualifyingFiles: [] });
  });

  it('returns false when agent mode is errand', async () => {
    vi.mocked(agentRepository.findById).mockResolvedValue({ id: 'a1', mode: 'errand' } as any);
    const result = await shouldRunQualityReview(params);
    expect(result).toEqual({ run: false, qualifyingFiles: [] });
  });

  it('returns false when task is not found', async () => {
    vi.mocked(taskRepository.findById).mockResolvedValue(undefined as any);
    const result = await shouldRunQualityReview(params);
    expect(result).toEqual({ run: false, qualifyingFiles: [] });
  });

  it('returns false when task status is quality_review (recursion guard)', async () => {
    vi.mocked(taskRepository.findById).mockResolvedValue({
      id: 't1',
      status: 'quality_review',
      initiativeId: 'i1',
      phaseId: 'p1',
    } as any);
    const result = await shouldRunQualityReview(params);
    expect(result).toEqual({ run: false, qualifyingFiles: [] });
  });

  it('returns false when task status is not in_progress', async () => {
    vi.mocked(taskRepository.findById).mockResolvedValue({
      id: 't1',
      status: 'pending',
      initiativeId: 'i1',
      phaseId: 'p1',
    } as any);
    const result = await shouldRunQualityReview(params);
    expect(result).toEqual({ run: false, qualifyingFiles: [] });
  });

  it('returns false when task has no initiativeId', async () => {
    vi.mocked(taskRepository.findById).mockResolvedValue({
      id: 't1',
      status: 'in_progress',
      initiativeId: null,
      phaseId: 'p1',
    } as any);
    const result = await shouldRunQualityReview(params);
    expect(result).toEqual({ run: false, qualifyingFiles: [] });
  });

  it('returns false when initiative is not found', async () => {
    vi.mocked(initiativeRepository.findById).mockResolvedValue(undefined as any);
    const result = await shouldRunQualityReview(params);
    expect(result).toEqual({ run: false, qualifyingFiles: [] });
  });

  it('returns false when initiative qualityReview is false', async () => {
    vi.mocked(initiativeRepository.findById).mockResolvedValue({
      id: 'i1',
      qualityReview: false,
      branch: 'cw/test',
    } as any);
    const result = await shouldRunQualityReview(params);
    expect(result).toEqual({ run: false, qualifyingFiles: [] });
  });

  it('returns false when task has no phaseId', async () => {
    vi.mocked(taskRepository.findById).mockResolvedValue({
      id: 't1',
      status: 'in_progress',
      initiativeId: 'i1',
      phaseId: null,
    } as any);
    const result = await shouldRunQualityReview(params);
    expect(result).toEqual({ run: false, qualifyingFiles: [] });
  });

  it('returns false when phase is not found', async () => {
    vi.mocked(phaseRepository.findById).mockResolvedValue(undefined as any);
    const result = await shouldRunQualityReview(params);
    expect(result).toEqual({ run: false, qualifyingFiles: [] });
  });

  it('returns false when initiative has no branch', async () => {
    vi.mocked(initiativeRepository.findById).mockResolvedValue({
      id: 'i1',
      qualityReview: true,
      branch: null,
    } as any);
    const result = await shouldRunQualityReview(params);
    expect(result).toEqual({ run: false, qualifyingFiles: [] });
  });

  it('returns false when no qualifying files in changeset', async () => {
    vi.mocked(branchManager.diffBranchesStat).mockResolvedValue([
      { path: 'src/routeTree.gen.ts', status: 'modified', additions: 1, deletions: 0 },
    ]);
    const result = await shouldRunQualityReview(params);
    expect(result).toEqual({ run: false, qualifyingFiles: [] });
  });

  it('returns true with qualifying files when all conditions pass', async () => {
    const result = await shouldRunQualityReview(params);
    expect(result.run).toBe(true);
    expect(result.qualifyingFiles).toContain('src/foo.ts');
  });
});

// ---------------------------------------------------------------------------
// runQualityReview
// ---------------------------------------------------------------------------

describe('runQualityReview', () => {
  let taskRepository: TaskRepository;
  let agentManager: AgentManager;
  let log: Logger;

  let params: Parameters<typeof runQualityReview>[0];

  beforeEach(() => {
    taskRepository = createTaskRepositoryMock();
    agentManager = createAgentManagerMock();
    log = createLoggerMock();

    params = {
      taskId: 't1',
      taskBranch: 'cw/test-task-t1',
      baseBranch: 'cw/test-phase-impl',
      initiativeId: 'i1',
      qualifyingFiles: ['src/foo.ts', 'src/bar.ts'],
      taskRepository,
      agentManager,
      log,
    };
  });

  it('transitions task to quality_review before spawning', async () => {
    await runQualityReview(params);
    expect(taskRepository.update).toHaveBeenCalledWith('t1', { status: 'quality_review' });
    // update called BEFORE spawn
    const updateOrder = vi.mocked(taskRepository.update).mock.invocationCallOrder[0]!;
    const spawnOrder = vi.mocked(agentManager.spawn).mock.invocationCallOrder[0]!;
    expect(updateOrder).toBeLessThan(spawnOrder);
  });

  it('spawns agent with mode execute on the task branch', async () => {
    await runQualityReview(params);
    expect(agentManager.spawn).toHaveBeenCalledWith(
      expect.objectContaining({
        mode: 'execute',
        branchName: 'cw/test-task-t1',
        baseBranch: 'cw/test-phase-impl',
      }),
    );
  });

  it('includes qualifying files in the prompt', async () => {
    await runQualityReview(params);
    const spawnArgs = vi.mocked(agentManager.spawn).mock.calls[0]![0];
    expect(spawnArgs.prompt).toContain('src/foo.ts');
    expect(spawnArgs.prompt).toContain('src/bar.ts');
    expect(spawnArgs.prompt).toContain('/simplify');
  });

  it('spawns with taskId and initiativeId', async () => {
    await runQualityReview(params);
    expect(agentManager.spawn).toHaveBeenCalledWith(
      expect.objectContaining({
        taskId: 't1',
        initiativeId: 'i1',
      }),
    );
  });

  it('on spawn failure: marks task completed and does not throw', async () => {
    vi.mocked(agentManager.spawn).mockRejectedValue(new Error('spawn failed'));
    await expect(runQualityReview(params)).resolves.toBeUndefined();
    // Last call to update should set status to completed
    const updateCalls = vi.mocked(taskRepository.update).mock.calls;
    const lastCall = updateCalls[updateCalls.length - 1]!;
    expect(lastCall).toEqual(['t1', { status: 'completed' }]);
  });

  it('logs info after successful spawn', async () => {
    await runQualityReview(params);
    expect(log.info).toHaveBeenCalledWith(
      expect.objectContaining({ taskId: 't1', reviewAgentId: 'review-agent-1' }),
      expect.any(String),
    );
  });

  it('logs error on spawn failure', async () => {
    vi.mocked(agentManager.spawn).mockRejectedValue(new Error('spawn failed'));
    await runQualityReview(params);
    expect(log.error).toHaveBeenCalledWith(
      expect.objectContaining({ taskId: 't1' }),
      expect.any(String),
    );
  });
});