import { describe, it, beforeEach, mock } from "node:test";
import assert from "node:assert";

describe("createWorktree", () => {
  beforeEach(() => {
    // モックをセットアップ
  });

  it("should create worktree with valid name", async () => {
    // テスト実装
  });

  it("should fail with invalid name", async () => {
    // エラーケースをテスト
  });
});

import { mock } from "node:test";

// ファイルシステムをモック
mock.module("node:fs/promises", {
  namedExports: {
    mkdir: mock.fn(() => Promise.resolve()),
    access: mock.fn(() => Promise.reject(new Error("Not found")))
  }
});

// 子プロセスをモック
mock.module("node:child_process", {
  namedExports: {
    spawn: mock.fn(() => mockProcess)
  }
});

const mockGitExecutor = {
  execute: mock.fn((args: string[]) => {
    if (args[0] === "worktree" && args[1] === "list") {
      return Result.ok("worktree /path/to/main\nHEAD abc123");
    }
    return Result.error(new Error("Command failed"));
  })
};

const mockFs = {
  access: mock.fn(async (path: string) => {
    if (path === "/tmp/phantom/repo") {
      throw new Error("ENOENT");
    }
  }),
  mkdir: mock.fn(async () => {})
};

const mockProcess = {
  stdout: { on: mock.fn() },
  stderr: { on: mock.fn() },
  on: mock.fn((event, callback) => {
    if (event === "exit") {
      callback(0);
    }
  })
};

it("should return ok result on success", async () => {
  const result = await createWorktree("feature");
  assert.strictEqual(result.ok, true);
  if (result.ok) {
    assert.strictEqual(result.value.name, "feature");
  }
});

it("should return error result on failure", async () => {
  const result = await createWorktree("../invalid");
  assert.strictEqual(result.ok, false);
  if (!result.ok) {
    assert.match(result.error.message, /invalid/i);
  }
});

describe("error handling", () => {
  it("should handle git command failure", async () => {
    mockGit.execute.mockReturnValue(
      Result.error(new Error("Git failed"))
    );
    
    const result = await operation();
    assert.strictEqual(result.ok, false);
  });

  it("should handle file system errors", async () => {
    mockFs.access.mockRejectedValue(new Error("Permission denied"));
    
    const result = await operation();
    assert.strictEqual(result.ok, false);
  });
});

it("should call git with correct arguments", async () => {
  await createWorktree("feature", "main");
  
  assert.strictEqual(mockGit.execute.mock.calls.length, 1);
  assert.deepStrictEqual(
    mockGit.execute.mock.calls[0].arguments[0],
    ["worktree", "add", "--detach", "/tmp/phantom/repo/feature", "main"]
  );
});

const fixtures = {
  validWorktree: {
    name: "feature-test",
    branch: "main",
    path: "/tmp/phantom/repo/feature-test"
  },
  
  gitWorktreeList: `worktree /path/to/main
HEAD abc123
branch refs/heads/main

worktree /tmp/phantom/repo/feature
HEAD def456
branch refs/heads/feature`,

  invalidNames: [
    "",
    ".",
    "..",
    "../escape",
    "with/slash",
    "with space"
  ]
};

function createMockGitExecutor(responses: Record<string, Result<string>>) {
  return {
    execute: mock.fn((args: string[]) => {
      const key = args.join(" ");
      return responses[key] || Result.error(new Error("Not mocked"));
    })
  };
}

function assertResultOk<T>(result: Result<T>): asserts result is { ok: true; value: T } {
  assert.strictEqual(result.ok, true, "Expected ok result");
}

// 良い: 説明的な振る舞い
it("should create worktree with custom branch name")
it("should return error when name contains invalid characters")
it("should cleanup resources on failure")

// 悪い: 実装に焦点を当てている
it("should call git command")
it("should set property")
it("should work")

// 良い: 特定のアサーション
assert.strictEqual(result.ok, true);
assert.strictEqual(worktree.name, "feature");
assert.match(error.message, /already exists/);

// 悪い: 汎用的なアサーション
assert(result.ok);
assert(worktree);
assert(error);

// クリーンな状態のためにbeforeEachを使用
beforeEach(() => {
  mock.module("node:fs/promises", {
    namedExports: createMockFs()
  });
});

// テスト後のクリーンアップ
afterEach(() => {
  mock.reset();
});

// 一時的なデバッグロギング
it("should handle complex scenario", async () => {
  const result = await operation();
  
  // デバッグ出力
  console.log("Result:", JSON.stringify(result, null, 2));
  console.log("Mock calls:", mockGit.execute.mock.calls);
  
  assert.strictEqual(result.ok, true);
});

it("should handle any valid worktree name", () => {
  for (const name of generateValidNames()) {
    const result = validateWorktreeName(name);
    assert.strictEqual(result.ok, true);
  }
});

it("should complete within performance budget", async () => {
  const start = performance.now();
  await operation();
  const duration = performance.now() - start;
  
  assert(duration < 100, `Operation took ${duration}ms`);
});