import { describe, expect, test } from 'vitest';

import {
  normalizeWindowsPath,
  parseWindowsProcessSnapshot,
  selectProcessTreeIds,
  selectWorktreeOwnedProcessIds,
} from './dev-windows-process.mjs';

function processEntry(overrides) {
  return {
    ProcessId: 1,
    ParentProcessId: 0,
    Name: 'node.exe',
    ExecutablePath: null,
    CommandLine: null,
    ...overrides,
  };
}

describe('Windows 进程快照解析', () => {
  test('单个进程对象也归一为数组', () => {
    const single = parseWindowsProcessSnapshot(
      JSON.stringify({ ProcessId: 42, ParentProcessId: 1 }),
    );
    expect(single).toHaveLength(1);
    expect(single[0].ProcessId).toBe(42);
  });

  test('空输出和非法 JSON 返回空数组', () => {
    expect(parseWindowsProcessSnapshot('')).toEqual([]);
    expect(parseWindowsProcessSnapshot('null')).toEqual([]);
    expect(parseWindowsProcessSnapshot('not json')).toEqual([]);
  });

  test('路径归一化去掉 \\\\?\\ 前缀、尾部分隔符并忽略大小写', () => {
    expect(
      normalizeWindowsPath('\\\\?\\C:\\Repo\\target\\debug\\api-server.exe'),
    ).toBe('c:\\repo\\target\\debug\\api-server.exe');
    expect(normalizeWindowsPath('C:\\Repo\\data\\')).toBe('c:\\repo\\data');
    expect(normalizeWindowsPath(null)).toBe('');
  });
});

describe('按根 PID 遍历进程树', () => {
  test('中间层进程已从快照消失时无法再到达更深的后代', () => {
    // cmd(10) -> wrapper(20) -> api-server(30)。Ctrl+C 先杀掉 10 和 20，
    // 快照里只剩 30（ParentProcessId 仍指向已消失的 20），父链断开后
    // 按根 PID 遍历只能拿到根自己，这正是后端被漏杀的原因。
    const snapshot = [
      processEntry({
        ProcessId: 30,
        ParentProcessId: 20,
        Name: 'api-server.exe',
      }),
    ];
    expect(selectProcessTreeIds(snapshot, 10)).toEqual([10]);
  });

  test('根已退出但中间层仍在快照里时仍可收全后代', () => {
    const snapshot = [
      processEntry({ ProcessId: 20, ParentProcessId: 10, Name: 'cargo.exe' }),
      processEntry({
        ProcessId: 30,
        ParentProcessId: 20,
        Name: 'api-server.exe',
      }),
    ];
    expect(selectProcessTreeIds(snapshot, 10).sort((a, b) => a - b)).toEqual([
      10, 20, 30,
    ]);
  });

  test('父链完整时能收全后代', () => {
    const snapshot = [
      processEntry({ ProcessId: 10, ParentProcessId: 1, Name: 'cmd.exe' }),
      processEntry({ ProcessId: 20, ParentProcessId: 10, Name: 'cargo.exe' }),
      processEntry({
        ProcessId: 30,
        ParentProcessId: 20,
        Name: 'api-server.exe',
      }),
      processEntry({ ProcessId: 40, ParentProcessId: 1, Name: 'other.exe' }),
    ];
    expect(selectProcessTreeIds(snapshot, 10).sort((a, b) => a - b)).toEqual([
      10, 20, 30,
    ]);
  });
});

describe('按身份匹配本工作树后端进程', () => {
  const apiServerExePath = 'C:\\Repo\\server-rs\\target\\debug\\api-server.exe';
  const spacetimeDataDir =
    'C:\\Repo\\server-rs\\.spacetimedb\\ai-game-creator\\data';

  test('只收本工作树的 api-server.exe 与同一 data-dir 的 SpacetimeDB', () => {
    const snapshot = [
      processEntry({
        ProcessId: 100,
        Name: 'api-server.exe',
        ExecutablePath: apiServerExePath,
        CommandLine: '"server-rs\\target\\debug\\api-server.exe"',
      }),
      processEntry({
        ProcessId: 101,
        Name: 'api-server.exe',
        ExecutablePath: 'C:\\Other\\server-rs\\target\\debug\\api-server.exe',
      }),
      processEntry({
        ProcessId: 102,
        Name: 'spacetimedb-standalone.exe',
        ExecutablePath:
          'C:\\Users\\me\\SpacetimeDB\\spacetimedb-standalone.exe',
        CommandLine: `spacetimedb-standalone.exe start --data-dir ${spacetimeDataDir} --listen-addr 127.0.0.1:3101`,
      }),
      processEntry({
        ProcessId: 103,
        Name: 'spacetimedb-standalone.exe',
        CommandLine:
          'spacetimedb-standalone.exe start --data-dir C:\\Other\\data --listen-addr 127.0.0.1:3101',
      }),
      processEntry({
        ProcessId: 104,
        Name: 'node.exe',
        CommandLine: `node dev.mjs --spacetime-data-dir ${spacetimeDataDir}`,
      }),
    ];

    expect(
      selectWorktreeOwnedProcessIds(snapshot, {
        apiServerExePath,
        spacetimeDataDir,
      }).sort((a, b) => a - b),
    ).toEqual([100, 102]);
  });

  test('只给 api-server 路径时不会误伤 SpacetimeDB', () => {
    const snapshot = [
      processEntry({
        ProcessId: 100,
        Name: 'api-server.exe',
        ExecutablePath: apiServerExePath,
      }),
      processEntry({
        ProcessId: 102,
        Name: 'spacetimedb-standalone.exe',
        CommandLine: `--data-dir ${spacetimeDataDir}`,
      }),
    ];

    expect(
      selectWorktreeOwnedProcessIds(snapshot, { apiServerExePath }),
    ).toEqual([100]);
  });

  test('排除自身进程且路径大小写不敏感', () => {
    const snapshot = [
      processEntry({
        ProcessId: 200,
        Name: 'api-server.exe',
        ExecutablePath: apiServerExePath.toUpperCase(),
      }),
    ];

    expect(
      selectWorktreeOwnedProcessIds(snapshot, {
        apiServerExePath,
        selfPid: 200,
      }),
    ).toEqual([]);
    expect(
      selectWorktreeOwnedProcessIds(snapshot, { apiServerExePath }),
    ).toEqual([200]);
  });

  test('没有可匹配身份时返回空数组', () => {
    const snapshot = [processEntry({ ProcessId: 100, Name: 'api-server.exe' })];
    expect(selectWorktreeOwnedProcessIds(snapshot, {})).toEqual([]);
  });
});