/**
 * ExecutionOrchestrator Tests
 *
 * Tests phase completion transitions, especially when initiative has no branch.
 */

import { describe, it, expect, vi, beforeEach } from 'vitest';
import { ExecutionOrchestrator } from './orchestrator.js';
import { ensureProjectClone } from '../git/project-clones.js';
import type { BranchManager } from '../git/branch-manager.js';

vi.mock('../git/project-clones.js', () => ({
  ensureProjectClone: vi.fn().mockResolvedValue('/tmp/test-workspace/clones/test'),
}));
import type { PhaseRepository } from '../db/repositories/phase-repository.js';
import type { TaskRepository } from '../db/repositories/task-repository.js';
import type { InitiativeRepository } from '../db/repositories/initiative-repository.js';
import type { ProjectRepository } from '../db/repositories/project-repository.js';
import type { DispatchManager, PhaseDispatchManager } from '../dispatch/types.js';
import type { ConflictResolutionService } from '../coordination/conflict-resolution-service.js';
import type { EventBus, TaskCompletedEvent, DomainEvent } from '../events/types.js';

function createMockEventBus(): EventBus & { handlers: Map<string, Function[]>; emitted: DomainEvent[] } {
  const handlers = new Map<string, Function[]>();
  const emitted: DomainEvent[] = [];
  return {
    handlers,
    emitted,
    emit: vi.fn((event: DomainEvent) => {
      emitted.push(event);
      const fns = handlers.get(event.type) ?? [];
      for (const fn of fns) fn(event);
    }),
    on: vi.fn((type: string, handler: Function) => {
      const fns = handlers.get(type) ?? [];
      fns.push(handler);
      handlers.set(type, fns);
    }),
    off: vi.fn(),
    once: vi.fn(),
  };
}

function createMocks() {
  const branchManager: BranchManager = {
    ensureBranch: vi.fn(),
    mergeBranch: vi.fn().mockResolvedValue({ success: true, message: 'merged', previousRef: 'abc000' }),
    diffBranches: vi.fn().mockResolvedValue(''),
    diffBranchesStat: vi.fn().mockResolvedValue([]),
    diffFileSingle: vi.fn().mockResolvedValue(''),
    deleteBranch: vi.fn(),
    branchExists: vi.fn().mockResolvedValue(true),
    remoteBranchExists: vi.fn().mockResolvedValue(false),
    listCommits: vi.fn().mockResolvedValue([]),
    diffCommit: vi.fn().mockResolvedValue(''),
    getMergeBase: vi.fn().mockResolvedValue('abc123'),
    pushBranch: vi.fn(),
    checkMergeability: vi.fn().mockResolvedValue({ mergeable: true }),
    fetchRemote: vi.fn(),
    fastForwardBranch: vi.fn(),
    updateRef: vi.fn(),
  };

  const phaseRepository = {
    findById: vi.fn(),
    findByInitiativeId: vi.fn().mockResolvedValue([]),
    update: vi.fn().mockImplementation(async (id: string, data: any) => ({ id, ...data })),
    create: vi.fn(),
  } as unknown as PhaseRepository;

  const taskRepository = {
    findById: vi.fn(),
    findByPhaseId: vi.fn().mockResolvedValue([]),
    findByInitiativeId: vi.fn().mockResolvedValue([]),
  } as unknown as TaskRepository;

  const initiativeRepository = {
    findById: vi.fn(),
    findByStatus: vi.fn().mockResolvedValue([]),
    update: vi.fn(),
  } as unknown as InitiativeRepository;

  const projectRepository = {
    findProjectsByInitiativeId: vi.fn().mockResolvedValue([]),
  } as unknown as ProjectRepository;

  const phaseDispatchManager: PhaseDispatchManager = {
    queuePhase: vi.fn(),
    getNextDispatchablePhase: vi.fn().mockResolvedValue(null),
    dispatchNextPhase: vi.fn().mockResolvedValue({ success: false, phaseId: '', reason: 'none' }),
    completePhase: vi.fn(),
    blockPhase: vi.fn(),
    getPhaseQueueState: vi.fn().mockResolvedValue({ queued: [], ready: [], blocked: [] }),
  };

  const dispatchManager = {
    queue: vi.fn(),
    getNextDispatchable: vi.fn().mockResolvedValue(null),
    dispatchNext: vi.fn().mockResolvedValue({ success: false, taskId: '' }),
    completeTask: vi.fn(),
    blockTask: vi.fn(),
    retryBlockedTask: vi.fn(),
    getQueueState: vi.fn().mockResolvedValue({ queued: [], ready: [], blocked: [] }),
  } as unknown as DispatchManager;

  const conflictResolutionService: ConflictResolutionService = {
    handleConflict: vi.fn(),
  };

  const eventBus = createMockEventBus();

  return {
    branchManager,
    phaseRepository,
    taskRepository,
    initiativeRepository,
    projectRepository,
    phaseDispatchManager,
    dispatchManager,
    conflictResolutionService,
    eventBus,
  };
}

function createOrchestrator(mocks: ReturnType<typeof createMocks>) {
  const orchestrator = new ExecutionOrchestrator(
    mocks.branchManager,
    mocks.phaseRepository,
    mocks.taskRepository,
    mocks.initiativeRepository,
    mocks.projectRepository,
    mocks.phaseDispatchManager,
    mocks.dispatchManager,
    mocks.conflictResolutionService,
    mocks.eventBus,
    '/tmp/test-workspace',
  );
  orchestrator.start();
  return orchestrator;
}

function emitTaskCompleted(eventBus: ReturnType<typeof createMockEventBus>, taskId: string) {
  const event: TaskCompletedEvent = {
    type: 'task:completed',
    timestamp: new Date(),
    payload: { taskId, agentId: 'agent-1', success: true, message: 'done' },
  };
  eventBus.emit(event);
}

describe('ExecutionOrchestrator', () => {
  let mocks: ReturnType<typeof createMocks>;

  beforeEach(() => {
    mocks = createMocks();
  });

  describe('phase completion when initiative has no branch', () => {
    it('should transition phase to pending_review in review mode even without a branch', async () => {
      const task = {
        id: 'task-1',
        phaseId: 'phase-1',
        initiativeId: 'init-1',
        category: 'execute',
        status: 'completed',
      };
      const phase = { id: 'phase-1', initiativeId: 'init-1', name: 'Phase 1', status: 'in_progress' };
      const initiative = { id: 'init-1', branch: null, executionMode: 'review_per_phase' };

      vi.mocked(mocks.taskRepository.findById).mockResolvedValue(task as any);
      vi.mocked(mocks.phaseRepository.findById).mockResolvedValue(phase as any);
      vi.mocked(mocks.initiativeRepository.findById).mockResolvedValue(initiative as any);
      vi.mocked(mocks.taskRepository.findByPhaseId).mockResolvedValue([task] as any);

      createOrchestrator(mocks);

      emitTaskCompleted(mocks.eventBus, 'task-1');

      // Allow async handler to complete
      await vi.waitFor(() => {
        expect(mocks.phaseRepository.update).toHaveBeenCalledWith('phase-1', { status: 'pending_review' });
      });
    });

    it('should complete phase in yolo mode even without a branch', async () => {
      const task = {
        id: 'task-1',
        phaseId: 'phase-1',
        initiativeId: 'init-1',
        category: 'execute',
        status: 'completed',
      };
      const phase = { id: 'phase-1', initiativeId: 'init-1', name: 'Phase 1', status: 'in_progress' };
      const initiative = { id: 'init-1', branch: null, executionMode: 'yolo' };

      vi.mocked(mocks.taskRepository.findById).mockResolvedValue(task as any);
      vi.mocked(mocks.phaseRepository.findById).mockResolvedValue(phase as any);
      vi.mocked(mocks.initiativeRepository.findById).mockResolvedValue(initiative as any);
      vi.mocked(mocks.initiativeRepository.findByStatus).mockResolvedValue([]);
      vi.mocked(mocks.taskRepository.findByPhaseId).mockResolvedValue([task] as any);
      vi.mocked(mocks.phaseRepository.findByInitiativeId).mockResolvedValue([phase] as any);

      createOrchestrator(mocks);

      emitTaskCompleted(mocks.eventBus, 'task-1');

      await vi.waitFor(() => {
        expect(mocks.phaseDispatchManager.completePhase).toHaveBeenCalledWith('phase-1');
      });

      // Should NOT have attempted any branch merges
      expect(mocks.branchManager.mergeBranch).not.toHaveBeenCalled();
    });
  });

  describe('phase completion when merge fails', () => {
    it('should still check phase completion even if task merge throws', async () => {
      const task = {
        id: 'task-1',
        phaseId: 'phase-1',
        initiativeId: 'init-1',
        category: 'execute',
        status: 'completed',
      };
      const phase = { id: 'phase-1', initiativeId: 'init-1', name: 'Phase 1', status: 'in_progress' };
      const initiative = { id: 'init-1', branch: 'cw/test', executionMode: 'review_per_phase' };
      const project = { id: 'proj-1', name: 'test', url: 'https://example.com', defaultBranch: 'main' };

      vi.mocked(mocks.taskRepository.findById).mockResolvedValue(task as any);
      vi.mocked(mocks.phaseRepository.findById).mockResolvedValue(phase as any);
      vi.mocked(mocks.initiativeRepository.findById).mockResolvedValue(initiative as any);
      vi.mocked(mocks.taskRepository.findByPhaseId).mockResolvedValue([task] as any);
      vi.mocked(mocks.projectRepository.findProjectsByInitiativeId).mockResolvedValue([project] as any);
      // Merge fails
      vi.mocked(mocks.branchManager.mergeBranch).mockResolvedValue({
        success: false,
        message: 'conflict',
        conflicts: ['file.ts'],
      });

      createOrchestrator(mocks);

      emitTaskCompleted(mocks.eventBus, 'task-1');

      // Phase should still transition despite merge failure
      await vi.waitFor(() => {
        expect(mocks.phaseRepository.update).toHaveBeenCalledWith('phase-1', { status: 'pending_review' });
      });
    });
  });

  describe('phase completion with branch (normal flow)', () => {
    it('should merge task branch and transition phase when all tasks done', async () => {
      const task = {
        id: 'task-1',
        phaseId: 'phase-1',
        initiativeId: 'init-1',
        category: 'execute',
        status: 'completed',
      };
      const phase = { id: 'phase-1', initiativeId: 'init-1', name: 'Phase 1', status: 'in_progress' };
      const initiative = { id: 'init-1', branch: 'cw/test', executionMode: 'review_per_phase' };
      const project = { id: 'proj-1', name: 'test', url: 'https://example.com', defaultBranch: 'main' };

      vi.mocked(mocks.taskRepository.findById).mockResolvedValue(task as any);
      vi.mocked(mocks.phaseRepository.findById).mockResolvedValue(phase as any);
      vi.mocked(mocks.initiativeRepository.findById).mockResolvedValue(initiative as any);
      vi.mocked(mocks.taskRepository.findByPhaseId).mockResolvedValue([task] as any);
      vi.mocked(mocks.projectRepository.findProjectsByInitiativeId).mockResolvedValue([project] as any);
      vi.mocked(mocks.branchManager.branchExists).mockResolvedValue(true);
      vi.mocked(mocks.branchManager.mergeBranch).mockResolvedValue({ success: true, message: 'ok' });

      createOrchestrator(mocks);

      emitTaskCompleted(mocks.eventBus, 'task-1');

      await vi.waitFor(() => {
        expect(mocks.phaseRepository.update).toHaveBeenCalledWith('phase-1', { status: 'pending_review' });
      });
    });

    it('should not transition phase when some tasks are still pending', async () => {
      const task1 = {
        id: 'task-1',
        phaseId: 'phase-1',
        initiativeId: 'init-1',
        category: 'execute',
        status: 'completed',
      };
      const task2 = {
        id: 'task-2',
        phaseId: 'phase-1',
        initiativeId: 'init-1',
        category: 'execute',
        status: 'pending',
      };
      const phase = { id: 'phase-1', initiativeId: 'init-1', name: 'Phase 1', status: 'in_progress' };
      const initiative = { id: 'init-1', branch: 'cw/test', executionMode: 'review_per_phase' };

      vi.mocked(mocks.taskRepository.findById).mockResolvedValue(task1 as any);
      vi.mocked(mocks.phaseRepository.findById).mockResolvedValue(phase as any);
      vi.mocked(mocks.initiativeRepository.findById).mockResolvedValue(initiative as any);
      vi.mocked(mocks.taskRepository.findByPhaseId).mockResolvedValue([task1, task2] as any);
      vi.mocked(mocks.projectRepository.findProjectsByInitiativeId).mockResolvedValue([]);

      createOrchestrator(mocks);

      emitTaskCompleted(mocks.eventBus, 'task-1');

      // Give the async handler time to run
      await new Promise((r) => setTimeout(r, 50));

      expect(mocks.phaseRepository.update).not.toHaveBeenCalled();
      expect(mocks.phaseDispatchManager.completePhase).not.toHaveBeenCalled();
    });
  });

  describe('approveInitiative', () => {
    function setupApproveTest(mocks: ReturnType<typeof createMocks>) {
      const initiative = { id: 'init-1', branch: 'cw/test', status: 'pending_review' };
      const project = { id: 'proj-1', name: 'test', url: 'https://example.com', defaultBranch: 'main' };
      vi.mocked(mocks.initiativeRepository.findById).mockResolvedValue(initiative as any);
      vi.mocked(mocks.projectRepository.findProjectsByInitiativeId).mockResolvedValue([project] as any);
      vi.mocked(mocks.branchManager.branchExists).mockResolvedValue(true);
      vi.mocked(mocks.branchManager.mergeBranch).mockResolvedValue({ success: true, message: 'ok', previousRef: 'abc000' });
      return { initiative, project };
    }

    it('should roll back merge when push fails', async () => {
      setupApproveTest(mocks);
      vi.mocked(mocks.branchManager.pushBranch).mockRejectedValue(new Error('non-fast-forward'));

      const orchestrator = createOrchestrator(mocks);

      await expect(orchestrator.approveInitiative('init-1', 'merge_and_push')).rejects.toThrow('non-fast-forward');

      // Should have rolled back the merge by restoring the previous ref
      expect(mocks.branchManager.updateRef).toHaveBeenCalledWith(
        expect.any(String),
        'main',
        'abc000',
      );

      // Should NOT have marked initiative as completed
      expect(mocks.initiativeRepository.update).not.toHaveBeenCalled();
    });

    it('should complete initiative when push succeeds', async () => {
      setupApproveTest(mocks);

      const orchestrator = createOrchestrator(mocks);

      await orchestrator.approveInitiative('init-1', 'merge_and_push');

      expect(mocks.branchManager.updateRef).not.toHaveBeenCalled();
      expect(mocks.initiativeRepository.update).toHaveBeenCalledWith('init-1', { status: 'completed' });
    });

    it('should not attempt rollback for push_branch strategy', async () => {
      setupApproveTest(mocks);
      vi.mocked(mocks.branchManager.pushBranch).mockRejectedValue(new Error('auth failed'));

      const orchestrator = createOrchestrator(mocks);

      await expect(orchestrator.approveInitiative('init-1', 'push_branch')).rejects.toThrow('auth failed');

      // No merge happened, so no rollback needed
      expect(mocks.branchManager.updateRef).not.toHaveBeenCalled();
    });
  });
});