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

vi.mock('electron', () => ({ default: { ipcMain: { handle: vi.fn() }, dialog: {}, shell: {} } }));
vi.mock('../../src/main/services/GitClient.js');
vi.mock('node:fs/promises', () => ({ mkdir: vi.fn(async () => undefined) }));

import electron from 'electron';
import { mkdir } from 'node:fs/promises';
import { GitClient } from '../../src/main/services/GitClient.js';
import { registerSettingsApi } from '../../src/main/ipc/settingsApi.js';
import type { SettingsIpcDeps } from '../../src/main/ipc/settingsApi.js';

function getHandler(channel: string): (...args: unknown[]) => unknown {
  const handle = (electron.ipcMain as unknown as { handle: ReturnType<typeof vi.fn> }).handle;
  const call = handle.mock.calls.find((c) => c[0] === channel);
  if (!call) throw new Error(`channel ${channel} not registered`);
  return call[1] as (...args: unknown[]) => unknown;
}

function makeDeps() {
  const gitInstance = {
    isRepo: vi.fn(async () => false),
    hasRemote: vi.fn(async () => false),
    run: vi.fn(async () => ({ stdout: '', stderr: '', exitCode: 0 }))
  };
  (GitClient as unknown as ReturnType<typeof vi.fn>).mockImplementation(function () { return gitInstance; });

  const syncSvc = {
    getSyncDir: vi.fn(() => '/tmp/sync'),
    listConflicts: vi.fn(() => [] as { path: string; localText: string; remoteText: string }[]),
    resolveConflict: vi.fn(async () => ({ ok: true as const })),
    getLastStatus: vi.fn(() => ({ lastAt: null as string | null, lastResult: null as { ok: boolean } | null }))
  };
  const settings = {
    getSyncRepoUrl: vi.fn(async () => 'git@host:u/r.git'),
    setSyncRepoUrl: vi.fn(async () => {}),
    isAutoSyncEnabled: vi.fn(async () => false),
    getSyncIntervalMin: vi.fn(async () => 30),
    getAll: vi.fn(async () => ({})),
    setAiEnabled: vi.fn(async () => {}),
    setOnboardingCompleted: vi.fn(async () => {}),
    isAiEnabled: vi.fn(async () => true)
  };

  const deps: Partial<SettingsIpcDeps> = {
    backup: { runDaily: vi.fn(async () => ({ snapshotted: false })) } as never,
    exportSvc: {} as never,
    importSvc: {} as never,
    syncSvc: syncSvc as never,
    telemetry: { exportTo: vi.fn(async () => ({ eventCount: 0 })) } as never,
    settings: settings as never,
    getInboxWindow: () => null
  };

  return { gitInstance, syncSvc, settings, deps };
}

describe('sync IPC channels', () => {
  beforeEach(() => {
    (electron.ipcMain as unknown as { handle: ReturnType<typeof vi.fn> }).handle.mockClear();
    vi.clearAllMocks();
  });

  it('5 sync channels registered', () => {
    const { deps } = makeDeps();
    registerSettingsApi(deps as SettingsIpcDeps);

    const handle = (electron.ipcMain as unknown as { handle: ReturnType<typeof vi.fn> }).handle;
    const channels = handle.mock.calls.map((c) => c[0]);
    expect(channels).toContain('settings:configure-sync');
    expect(channels).toContain('settings:test-sync-connection');
    expect(channels).toContain('sync:list-conflicts');
    expect(channels).toContain('sync:resolve-conflict');
    expect(channels).toContain('sync:get-status');
  });

  describe('settings:configure-sync', () => {
    it('null URL → setSyncRepoUrl(null), no git init', async () => {
      const { deps, settings, gitInstance } = makeDeps();
      registerSettingsApi(deps as SettingsIpcDeps);
      const h = getHandler('settings:configure-sync');
      const r = await h({}, null);
      expect(settings.setSyncRepoUrl).toHaveBeenCalledWith(null);
      expect(gitInstance.run).not.toHaveBeenCalled();
      expect(r).toEqual({ ok: true });
    });

    it('empty string URL → treated as null', async () => {
      const { deps, settings, gitInstance } = makeDeps();
      registerSettingsApi(deps as SettingsIpcDeps);
      const h = getHandler('settings:configure-sync');
      const r = await h({}, '   ');
      expect(settings.setSyncRepoUrl).toHaveBeenCalledWith(null);
      expect(gitInstance.run).not.toHaveBeenCalled();
      expect(r).toEqual({ ok: true });
    });

    it('valid URL → isRepo=false → git init + remote add', async () => {
      const { deps, gitInstance } = makeDeps();
      gitInstance.isRepo.mockResolvedValue(false);
      gitInstance.hasRemote.mockResolvedValue(false);
      registerSettingsApi(deps as SettingsIpcDeps);
      const h = getHandler('settings:configure-sync');
      const r = await h({}, 'git@github.com:user/repo.git');
      expect(gitInstance.run).toHaveBeenCalledWith(['init']);
      expect(gitInstance.run).toHaveBeenCalledWith(['remote', 'add', 'origin', 'git@github.com:user/repo.git']);
      expect(r).toEqual({ ok: true });
    });

    // Regression: syncDir 미생성 상태에서 `git -C <syncDir> init` 호출 시
    // git 이 chdir 실패로 죽음 → mkdir(recursive) 가 init 보다 먼저 호출되어야 함.
    // (runSync 의 line 135 패턴과 동일.)
    it('mkdir(syncDir, recursive) 가 git init 전에 호출됨', async () => {
      const { deps, gitInstance } = makeDeps();
      gitInstance.isRepo.mockResolvedValue(false);
      const callOrder: string[] = [];
      (mkdir as unknown as ReturnType<typeof vi.fn>).mockImplementationOnce(async () => { callOrder.push('mkdir'); });
      (gitInstance.run as unknown as ReturnType<typeof vi.fn>).mockImplementation(async (args: string[]) => {
        callOrder.push(`git:${args[0]}`);
        return { stdout: '', stderr: '', exitCode: 0 };
      });
      registerSettingsApi(deps as SettingsIpcDeps);
      const h = getHandler('settings:configure-sync');
      await h({}, 'git@github.com:user/repo.git');
      expect(mkdir).toHaveBeenCalledWith('/tmp/sync', { recursive: true });
      expect(callOrder.indexOf('mkdir')).toBeLessThan(callOrder.indexOf('git:init'));
    });

    it('valid URL → isRepo=true, hasRemote=true → remote set-url', async () => {
      const { deps, gitInstance } = makeDeps();
      gitInstance.isRepo.mockResolvedValue(true);
      gitInstance.hasRemote.mockResolvedValue(true);
      registerSettingsApi(deps as SettingsIpcDeps);
      const h = getHandler('settings:configure-sync');
      const r = await h({}, 'git@github.com:user/new-repo.git');
      expect(gitInstance.run).toHaveBeenCalledWith(['remote', 'set-url', 'origin', 'git@github.com:user/new-repo.git']);
      expect(r).toEqual({ ok: true });
    });

    it('git init failure → ok: false', async () => {
      const { deps, gitInstance } = makeDeps();
      gitInstance.isRepo.mockResolvedValue(false);
      gitInstance.run.mockResolvedValue({ stdout: '', stderr: 'permission denied', exitCode: 1 });
      registerSettingsApi(deps as SettingsIpcDeps);
      const h = getHandler('settings:configure-sync');
      const r = await h({}, 'git@github.com:user/repo.git');
      expect(r).toMatchObject({ ok: false, reason: expect.stringContaining('git init failed') });
    });

    it('setSyncRepoUrl throws → ok: false', async () => {
      const { deps, settings } = makeDeps();
      settings.setSyncRepoUrl.mockRejectedValue(new Error('disk full'));
      registerSettingsApi(deps as SettingsIpcDeps);
      const h = getHandler('settings:configure-sync');
      const r = await h({}, 'git@github.com:user/repo.git');
      expect(r).toMatchObject({ ok: false, reason: expect.stringContaining('persist failed') });
    });
  });

  describe('settings:test-sync-connection', () => {
    it('not initialized → ok: false, reason: not_initialized', async () => {
      const { deps, gitInstance } = makeDeps();
      gitInstance.isRepo.mockResolvedValue(false);
      registerSettingsApi(deps as SettingsIpcDeps);
      const h = getHandler('settings:test-sync-connection');
      const r = await h({});
      expect(r).toEqual({ ok: false, reason: 'not_initialized' });
    });

    it('ls-remote success → ok: true', async () => {
      const { deps, gitInstance } = makeDeps();
      gitInstance.isRepo.mockResolvedValue(true);
      gitInstance.run.mockResolvedValue({ stdout: 'abc123\trefs/heads/main', stderr: '', exitCode: 0 });
      registerSettingsApi(deps as SettingsIpcDeps);
      const h = getHandler('settings:test-sync-connection');
      const r = await h({});
      expect(gitInstance.run).toHaveBeenCalledWith(['ls-remote', 'origin']);
      expect(r).toEqual({ ok: true });
    });

    it('ls-remote failure → ok: false', async () => {
      const { deps, gitInstance } = makeDeps();
      gitInstance.isRepo.mockResolvedValue(true);
      gitInstance.run.mockResolvedValue({ stdout: '', stderr: 'connection refused', exitCode: 128 });
      registerSettingsApi(deps as SettingsIpcDeps);
      const h = getHandler('settings:test-sync-connection');
      const r = await h({});
      expect(r).toMatchObject({ ok: false, reason: 'connection refused' });
    });
  });

  describe('sync:list-conflicts', () => {
    it('returns syncSvc.listConflicts() result', () => {
      const { deps, syncSvc } = makeDeps();
      const conflicts = [{ path: 'notes/abc.md', localText: 'local', remoteText: 'remote' }];
      syncSvc.listConflicts.mockReturnValue(conflicts);
      registerSettingsApi(deps as SettingsIpcDeps);
      const h = getHandler('sync:list-conflicts');
      const r = h({});
      expect(r).toEqual(conflicts);
    });
  });

  describe('sync:resolve-conflict', () => {
    it('valid choice "local" → delegates to syncSvc.resolveConflict (path)', async () => {
      const { deps, syncSvc } = makeDeps();
      registerSettingsApi(deps as SettingsIpcDeps);
      const h = getHandler('sync:resolve-conflict');
      const r = await h({}, 'notes/note-1.md', 'local');
      expect(syncSvc.resolveConflict).toHaveBeenCalledWith('notes/note-1.md', 'local');
      expect(r).toEqual({ ok: true });
    });

    it('valid choice "remote" → delegates to syncSvc.resolveConflict (path)', async () => {
      const { deps, syncSvc } = makeDeps();
      registerSettingsApi(deps as SettingsIpcDeps);
      const h = getHandler('sync:resolve-conflict');
      await h({}, 'notes/note-2.md', 'remote');
      expect(syncSvc.resolveConflict).toHaveBeenCalledWith('notes/note-2.md', 'remote');
    });

    it('invalid choice → ok: false, reason: invalid choice', async () => {
      const { deps, syncSvc } = makeDeps();
      registerSettingsApi(deps as SettingsIpcDeps);
      const h = getHandler('sync:resolve-conflict');
      const r = await h({}, 'notes/note-1.md', 'both');
      expect(syncSvc.resolveConflict).not.toHaveBeenCalled();
      expect(r).toEqual({ ok: false, reason: 'invalid choice' });
    });
  });

  describe('sync:get-status', () => {
    it('auto-sync disabled → nextAt: null', async () => {
      const { deps, syncSvc, settings } = makeDeps();
      settings.isAutoSyncEnabled.mockResolvedValue(false);
      syncSvc.getLastStatus.mockReturnValue({ lastAt: '2026-05-09T10:00:00.000Z', lastResult: { ok: true } });
      registerSettingsApi(deps as SettingsIpcDeps);
      const h = getHandler('sync:get-status');
      const r = await h({});
      expect(r).toMatchObject({ lastAt: '2026-05-09T10:00:00.000Z', lastResult: { ok: true }, nextAt: null });
    });

    it('auto-sync enabled → nextAt computed from lastAt + interval', async () => {
      const { deps, syncSvc, settings } = makeDeps();
      settings.isAutoSyncEnabled.mockResolvedValue(true);
      settings.getSyncIntervalMin.mockResolvedValue(30);
      syncSvc.getLastStatus.mockReturnValue({ lastAt: '2026-05-09T10:00:00.000Z', lastResult: { ok: true } });
      registerSettingsApi(deps as SettingsIpcDeps);
      const h = getHandler('sync:get-status');
      const r = (await h({})) as { lastAt: string; nextAt: string };
      const expectedNextAt = new Date(new Date('2026-05-09T10:00:00.000Z').getTime() + 30 * 60 * 1000).toISOString();
      expect(r.nextAt).toBe(expectedNextAt);
    });

    it('no previous sync + auto-sync enabled → nextAt based on Date.now()', async () => {
      const { deps, syncSvc, settings } = makeDeps();
      settings.isAutoSyncEnabled.mockResolvedValue(true);
      settings.getSyncIntervalMin.mockResolvedValue(15);
      syncSvc.getLastStatus.mockReturnValue({ lastAt: null, lastResult: null });
      registerSettingsApi(deps as SettingsIpcDeps);
      const h = getHandler('sync:get-status');
      const before = Date.now();
      const r = (await h({})) as { lastAt: null; nextAt: string };
      const after = Date.now();
      const nextAtMs = new Date(r.nextAt).getTime();
      expect(nextAtMs).toBeGreaterThanOrEqual(before + 15 * 60 * 1000);
      expect(nextAtMs).toBeLessThanOrEqual(after + 15 * 60 * 1000);
      expect(r.lastAt).toBeNull();
    });
  });
});