import assert from 'node:assert/strict';
import { execFileSync, spawnSync } from 'node:child_process';
import {
  chmodSync,
  mkdirSync,
  mkdtempSync,
  readFileSync,
  realpathSync,
  rmSync,
  symlinkSync,
  writeFileSync,
} from 'node:fs';
import { homedir } from 'node:os';
import { delimiter, dirname, join, resolve } from 'node:path';
import { test } from 'node:test';
import { fileURLToPath } from 'node:url';

const repoRoot = resolve(dirname(fileURLToPath(import.meta.url)), '..');
const packageJson = JSON.parse(
  readFileSync(join(repoRoot, 'package.json'), 'utf8'),
);

test('pre-commit hook fixes staged imports and formatting without swallowing unstaged work', () => {
  assertGuardChildInheritsPoisonedEnvironment();

  assert.equal(packageJson.scripts.prepare, 'husky');
  assert.equal(packageJson.scripts['format:staged'], 'lint-staged');
  assert.deepEqual(packageJson['lint-staged'], {
    '*.{js,mjs,cjs,ts,tsx}': [
      'node scripts/lint-staged-eslint.mjs',
      'prettier --write',
    ],
    '*.rs': ['node scripts/lint-staged-rustfmt.mjs'],
  });
  assertHookClearsGitEnvironment(
    'pre-commit',
    readFileSync(join(repoRoot, '.husky', 'pre-commit'), 'utf8'),
    'npm run format:staged',
  );

  const tempRepo = createTempDirectory('genarrative-git-hooks-');
  try {
    git(tempRepo, 'init', '--quiet');
    git(tempRepo, 'config', 'user.email', 'git-hooks-test@example.invalid');
    git(tempRepo, 'config', 'user.name', 'Git Hooks Test');
    writeFileSync(
      join(tempRepo, '.eslintrc.cjs'),
      `module.exports = ${JSON.stringify({
        root: true,
        ignorePatterns: ['ignored/**'],
        parserOptions: { ecmaVersion: 'latest', sourceType: 'module' },
        plugins: ['simple-import-sort'],
        rules: { 'simple-import-sort/imports': 'error' },
      })};\n`,
    );
    writeFileSync(
      join(tempRepo, '.prettierrc.json'),
      JSON.stringify({ singleQuote: true, semi: true, trailingComma: 'all' }),
    );
    symlinkSync(
      join(repoRoot, 'node_modules'),
      join(tempRepo, 'node_modules'),
      // Windows directory symlinks require an elevated token unless Developer
      // Mode is enabled; junctions provide the same fixture semantics without
      // that privilege requirement.
      process.platform === 'win32' ? 'junction' : 'dir',
    );

    const sourcePath = join(tempRepo, 'sample.ts');
    const partialPath = join(tempRepo, 'partial.ts');
    const ignoredDir = join(tempRepo, 'ignored');
    const ignoredPath = join(ignoredDir, 'legacy.ts');
    mkdirSync(ignoredDir);
    writeFileSync(
      sourcePath,
      "import { alpha } from './alpha';\nimport { zebra } from './zebra';\n\nvoid alpha;\nvoid zebra;\n",
    );
    writeFileSync(partialPath, 'const original = 1;\nconst keep = 2;\n');
    writeFileSync(
      ignoredPath,
      "import { zebra } from './zebra';\nimport { alpha } from './alpha';\nvoid zebra; void alpha;\n",
    );
    git(
      tempRepo,
      'add',
      'sample.ts',
      'partial.ts',
      'ignored/legacy.ts',
      '.eslintrc.cjs',
      '.prettierrc.json',
    );
    git(
      tempRepo,
      '-c',
      'commit.gpgsign=false',
      'commit',
      '--quiet',
      '-m',
      'baseline',
    );

    writeFileSync(
      sourcePath,
      "import { zebra } from './zebra';\nimport { alpha } from './alpha';\nconst staged={value:1}\nvoid zebra; void alpha; void staged;\n",
    );
    writeFileSync(partialPath, 'const original={value:1}\nconst keep = 2;\n');
    writeFileSync(
      ignoredPath,
      "import { zebra } from './zebra';\nimport { alpha } from './alpha';\nvoid zebra; void alpha;\n// staged ignored change\n",
    );
    git(tempRepo, 'add', 'sample.ts', 'partial.ts', 'ignored/legacy.ts');
    writeFileSync(
      partialPath,
      'const original={value:1}\nconst keep={unstaged:true}\n',
    );

    const lintStagedConfig = {
      '*.{js,mjs,cjs,ts,tsx}': [
        `node ${JSON.stringify(join(repoRoot, 'scripts', 'lint-staged-eslint.mjs'))}`,
        'prettier --write',
      ],
    };

    const lintStaged = spawnSync(
      process.execPath,
      [
        join(repoRoot, 'node_modules', 'lint-staged', 'bin', 'lint-staged.js'),
        '--config',
        '-',
      ],
      {
        cwd: tempRepo,
        encoding: 'utf8',
        env: {
          ...isolatedGitEnvironment(),
          PATH: `${join(repoRoot, 'node_modules', '.bin')}${delimiter}${process.env.PATH ?? ''}`,
        },
        input: JSON.stringify(lintStagedConfig),
      },
    );

    assert.equal(
      lintStaged.status,
      0,
      `${lintStaged.stdout ?? ''}${lintStaged.stderr ?? ''}`,
    );
    assert.equal(
      git(tempRepo, 'show', ':sample.ts'),
      "import { alpha } from './alpha';\nimport { zebra } from './zebra';\nconst staged = { value: 1 };\nvoid zebra;\nvoid alpha;\nvoid staged;\n",
    );
    assert.equal(
      git(tempRepo, 'show', ':partial.ts'),
      'const original = { value: 1 };\nconst keep = 2;\n',
    );
    assert.equal(
      readFileSync(partialPath, 'utf8').replaceAll('\r\n', '\n'),
      'const original = { value: 1 };\nconst keep={unstaged:true}\n',
    );
    assert.equal(
      git(tempRepo, 'show', ':ignored/legacy.ts'),
      "import { zebra } from './zebra';\nimport { alpha } from './alpha';\nvoid zebra;\nvoid alpha;\n// staged ignored change\n",
    );
  } finally {
    rmSync(tempRepo, { force: true, recursive: true });
  }
});

test('pre-push runs repository parity only for master updates', () => {
  assertGuardChildInheritsPoisonedEnvironment();

  const tempDir = createTempDirectory('genarrative-pre-push-');
  try {
    const npmLog = join(tempDir, 'repo', 'npm.log');
    const tempRepo = join(tempDir, 'repo');
    mkdirSync(tempRepo);
    git(tempRepo, 'init', '--quiet');
    git(tempRepo, 'config', 'user.email', 'git-hooks-test@example.invalid');
    git(tempRepo, 'config', 'user.name', 'Git Hooks Test');
    writeFileSync(join(tempRepo, 'tracked.txt'), 'baseline\n');
    git(tempRepo, 'add', 'tracked.txt');
    git(
      tempRepo,
      '-c',
      'commit.gpgsign=false',
      'commit',
      '--quiet',
      '-m',
      'baseline',
    );
    const localSha = git(tempRepo, 'rev-parse', 'HEAD').trim();
    writeFileSync(
      join(tempRepo, 'git'),
      `#!/usr/bin/env bash
if [[ "$1" == 'rev-parse' && "$2" == 'HEAD' ]]; then
  printf '%s\\n' '${localSha}'
  exit 0
fi
if [[ "$1" == 'diff' ]]; then exit 0; fi
exit 1
`,
    );
    chmodSync(join(tempRepo, 'git'), 0o755);
    writeFileSync(
      join(tempRepo, 'pre-push-master.sh'),
      readFileSync(join(repoRoot, 'scripts', 'pre-push-master.sh'), 'utf8'),
    );
    writeFileSync(
      join(tempRepo, 'npm'),
      '#!/usr/bin/env bash\nprintf \'%s\\n\' "$*" >> npm.log\n',
    );
    chmodSync(join(tempRepo, 'npm'), 0o755);
    const spawnHook = (input) => {
      writeFileSync(join(tempRepo, 'push.input'), input);
      return spawnSync(
        'bash',
        [
          '-c',
          'PATH="$PWD:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"; export PATH; source ./pre-push-master.sh origin example.invalid < push.input',
        ],
        {
          cwd: tempRepo,
          encoding: 'utf8',
          env: isolatedGitEnvironment(),
        },
      );
    };
    const featurePush = spawnHook(
      'refs/heads/feature 1111111111111111111111111111111111111111 refs/heads/feature 2222222222222222222222222222222222222222\n',
    );
    assert.equal(featurePush.status, 0, featurePush.stderr);
    assert.equal(readFileOrEmpty(npmLog), '');

    const masterPush = spawnHook(
      `refs/heads/master ${localSha} refs/heads/master 2222222222222222222222222222222222222222\n`,
    );
    assert.equal(masterPush.status, 0, masterPush.stderr);
    assert.equal(
      readFileSync(npmLog, 'utf8'),
      `run check:repository-ci -- 2222222222222222222222222222222222222222 ${localSha}\n`,
    );
  } finally {
    rmSync(tempDir, { force: true, recursive: true });
  }
});

test('hook fixtures do not mutate the calling linked worktree or its index', () => {
  const tempDir = createTempDirectory('genarrative-hook-isolation-');
  try {
    const outerRepo = join(tempDir, 'outer');
    const worktree = join(tempDir, 'worktree');
    mkdirSync(outerRepo);
    git(outerRepo, 'init', '--quiet');
    git(outerRepo, 'config', 'user.email', 'outer@example.invalid');
    git(outerRepo, 'config', 'user.name', 'Outer Repository');
    writeFileSync(join(outerRepo, 'sentinel.txt'), 'committed\n');
    git(outerRepo, 'add', 'sentinel.txt');
    git(
      outerRepo,
      '-c',
      'commit.gpgsign=false',
      'commit',
      '--quiet',
      '-m',
      'sentinel',
    );
    git(
      outerRepo,
      'worktree',
      'add',
      '--quiet',
      '-b',
      'fixture-caller',
      worktree,
    );
    writeFileSync(join(worktree, 'sentinel.txt'), 'staged\n');
    git(worktree, 'add', 'sentinel.txt');
    writeFileSync(join(worktree, 'sentinel.txt'), 'unstaged\n');
    const gitDir = git(worktree, 'rev-parse', '--absolute-git-dir').trim();
    const indexPath = join(gitDir, 'index');
    const before = {
      refs: git(outerRepo, 'show-ref'),
      config: readFileSync(join(outerRepo, '.git', 'config'), 'utf8'),
      index: readFileSync(indexPath),
      status: git(worktree, 'status', '--porcelain'),
    };
    const result = spawnSync(
      process.execPath,
      [
        '--test',
        '--test-reporter=tap',
        '--test-name-pattern=^pre-(commit|push)',
        fileURLToPath(import.meta.url),
      ],
      {
        cwd: worktree,
        encoding: 'utf8',
        env: {
          ...isolatedGitEnvironment(),
          NODE_TEST_CONTEXT: undefined,
          GENARRATIVE_HOOK_GUARD_CHILD: '1',
          GIT_DIR: gitDir,
          GIT_COMMON_DIR: join(outerRepo, '.git'),
          GIT_WORK_TREE: worktree,
          GIT_INDEX_FILE: indexPath,
          GIT_PREFIX: '',
          GIT_CONFIG_COUNT: '1',
          GIT_CONFIG_KEY_0: 'core.worktree',
          GIT_CONFIG_VALUE_0: worktree,
        },
      },
    );
    assert.equal(
      result.status,
      0,
      `${result.stdout ?? ''}${result.stderr ?? ''}`,
    );
    assert.match(result.stdout, /# pass 2\b/u);
    assert.equal(git(outerRepo, 'show-ref'), before.refs);
    assert.equal(
      readFileSync(join(outerRepo, '.git', 'config'), 'utf8'),
      before.config,
    );
    assert.deepEqual(readFileSync(indexPath), before.index);
    assert.equal(git(worktree, 'status', '--porcelain'), before.status);
    assert.equal(
      readFileSync(join(worktree, 'sentinel.txt'), 'utf8'),
      'unstaged\n',
    );
  } finally {
    rmSync(tempDir, { force: true, recursive: true });
  }
});

test('Gitea Repository checks and master pre-push share the same repository command', () => {
  const workflow = readFileSync(
    join(repoRoot, '.gitea', 'workflows', 'project-ci.yml'),
    'utf8',
  );
  const repositoryScript = readFileSync(
    join(repoRoot, 'scripts', 'check-repository-ci.sh'),
    'utf8',
  );
  const prePushHook = readFileSync(
    join(repoRoot, '.husky', 'pre-push'),
    'utf8',
  );

  assert.match(workflow, /run: npm run check:repository-ci/u);
  assert.equal(
    (workflow.match(/npm run check:repository-ci/gu) ?? []).length,
    1,
  );
  assert.match(repositoryScript, /npm run lint/u);
  assert.match(
    repositoryScript,
    /SPACETIME_SCHEMA_BASE_REF="\$\{base_ref\}" npm run lint/u,
  );
  assert.match(
    repositoryScript,
    /npm run lint[\s\S]*npm run test -- apps\/ai-game-creator-shell\/tests\/appSurface\.test\.ts[\s\S]*npm run build/u,
  );
  assert.match(repositoryScript, /npm run build/u);
  assert.match(repositoryScript, /git diff --check/u);
  assertHookClearsGitEnvironment(
    'pre-push',
    prePushHook,
    'npm run check:pre-push-master -- "$@"',
  );
  assert.match(
    repositoryScript,
    /^unset GIT_DIR GIT_WORK_TREE GIT_INDEX_FILE GIT_COMMON_DIR/mu,
  );
});

function readFileOrEmpty(path) {
  try {
    return readFileSync(path, 'utf8');
  } catch (error) {
    if (error?.code === 'ENOENT') {
      return '';
    }
    throw error;
  }
}

function toBashPath(path) {
  const windowsDrive = /^([A-Za-z]):[\\/](.*)$/u.exec(path);
  if (windowsDrive) {
    return `/mnt/${windowsDrive[1].toLowerCase()}/${windowsDrive[2].replaceAll('\\', '/')}`;
  }
  return path;
}

function git(cwd, ...args) {
  const env = isolatedGitEnvironment();
  assertFixtureRepository(cwd, env);
  return execFileSync(
    'git',
    ['--no-pager', '-c', `core.hooksPath=${nullDevice}`, ...args],
    {
      cwd,
      encoding: 'utf8',
      env,
    },
  );
}

// 夹具命令必须落在夹具自己的仓库：继承的 GIT_DIR/GIT_WORK_TREE 优先级高于 cwd，曾让夹具把
// 身份、core.bare 与 core.worktree 写进调用方的真实仓库。
function assertFixtureRepository(cwd, env) {
  const probe = spawnSync('git', ['rev-parse', '--show-toplevel'], {
    cwd,
    encoding: 'utf8',
    env,
  });
  if (probe.status !== 0) {
    // 此时夹具目录还不是仓库（例如首次 git init），命令本身会把它建起来。
    return;
  }
  const toplevel = realpathSync.native(probe.stdout.trim());
  const expected = realpathSync.native(resolve(cwd));
  assert.equal(
    toplevel,
    expected,
    `夹具 Git 命令会落到外部仓库：cwd=${expected} toplevel=${toplevel}`,
  );
}

function isolatedGitEnvironment() {
  // Git hooks export repository/index paths that override cwd, including in
  // linked worktrees. Fixture Git and lint-staged must never inherit them.
  return Object.fromEntries(
    Object.entries(process.env).filter(([name]) => !/^GIT_/iu.test(name)),
  );
}

// 守卫用例把本文件跑在毒化环境里；子进程必须真的继承 GIT_DIR，否则断言会空转。
function assertGuardChildInheritsPoisonedEnvironment() {
  if (process.env.GENARRATIVE_HOOK_GUARD_CHILD !== '1') {
    return;
  }
  assert.ok(process.env.GIT_DIR, '守卫子进程必须继承 GIT_DIR');
  assert.equal(
    Object.hasOwn(isolatedGitEnvironment(), 'GIT_DIR'),
    false,
    '夹具子进程环境必须清除 GIT_DIR',
  );
}

function assertHookClearsGitEnvironment(hookName, contents, command) {
  const lines = contents.trimEnd().split('\n');
  assert.equal(
    lines.at(-1),
    command,
    `${hookName} 最后一行必须保持原有钩子命令`,
  );
  const unsetLine = lines.find((line) => line.startsWith('unset '));
  assert.ok(unsetLine, `${hookName} 必须先清除 Git 注入的仓库定位变量`);
  const cleared = new Set(unsetLine.split(/\s+/u));
  for (const variable of [
    'GIT_DIR',
    'GIT_WORK_TREE',
    'GIT_INDEX_FILE',
    'GIT_COMMON_DIR',
  ]) {
    assert.ok(cleared.has(variable), `${hookName} 必须清除 ${variable}`);
  }
}

const nullDevice = process.platform === 'win32' ? 'NUL' : '/dev/null';

function createTempDirectory(prefix) {
  const tempRoot = join(homedir(), 'data', 'tmp');
  mkdirSync(tempRoot, { recursive: true });
  return mkdtempSync(join(tempRoot, prefix));
}