import { EventEmitter } from 'node:events';
import { existsSync, mkdtempSync, rmSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';

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

import {
  readCargoTarget,
  resolveEditorFeatures,
} from '../scripts/cargo-features.mjs';
import {
  isProcessGroupAlive,
  spawnChild,
  terminateChildTree,
} from '../scripts/start-dev-stack.mjs';
import {
  buildTauriArguments,
  buildTauriDevProcessEnv,
  prepareBundledResourcesBeforeTauri,
  runTauriDev as runTauriDevImpl,
  withDevCargoFeatures,
} from '../scripts/start-tauri-dev.mjs';

const testEndpoint = {
  host: '127.0.0.1',
  port: 10005,
  url: 'http://127.0.0.1:10005/',
  markerUrl: 'http://127.0.0.1:10005/__agc_dev_server.json',
  portRange: { start: 10000, end: 10099, label: '10000-10099' },
};
const resolveTestEndpoint = async () => testEndpoint;
const runTauriDev = (
  argv: string[],
  options: Parameters<typeof runTauriDevImpl>[1],
) =>
  runTauriDevImpl(argv, {
    prepareFrontend: async () => {},
    // 随包资源准备会读取真实上游包与仓库插件工作区；需要断言的用例自行注入。
    prepareResources: () => {},
    ...options,
  });

async function waitForFile(path: string, timeoutMs = 5000) {
  const deadline = Date.now() + timeoutMs;
  while (Date.now() < deadline) {
    if (existsSync(path)) {
      return;
    }
    await new Promise((resolveWait) => setTimeout(resolveWait, 25));
  }
  throw new Error(`等待测试进程标记超时: ${path}`);
}

describe('AI 游戏创作 Tauri dev 启动参数', () => {
  test('开发构建默认带上 Cocos 编辑器 feature', () => {
    expect(
      withDevCargoFeatures(['--no-watch'], ['cocos-editor-execute']),
    ).toEqual(['--features=cocos-editor-execute', '--no-watch']);
    expect(withDevCargoFeatures(['--no-watch'], [])).toEqual(['--no-watch']);
    expect(
      withDevCargoFeatures(
        ['--features', 'custom-feature'],
        ['cocos-editor-execute'],
      ),
    ).toEqual(['--features', 'custom-feature']);
  });

  test('普通 dev 参数原样交给 Tauri CLI', () => {
    expect(buildTauriArguments(['--no-watch'], testEndpoint.url)).toEqual([
      'dev',
      '--no-watch',
      '--config',
      '{"build":{"devUrl":"http://127.0.0.1:10005/","beforeDevCommand":""}}',
    ]);
  });

  test('动态 devUrl 配置位于用户 Tauri 配置之后且不越过参数分隔符', () => {
    expect(
      buildTauriArguments(
        ['--config', 'custom.json', '--', '--', '--example-app-arg'],
        testEndpoint.url,
      ),
    ).toEqual([
      'dev',
      '--config',
      'custom.json',
      '--config',
      '{"build":{"devUrl":"http://127.0.0.1:10005/","beforeDevCommand":""}}',
      '--',
      '--',
      '--example-app-arg',
    ]);
  });

  test('单个启动器分隔符后的参数进入应用而不是 Cargo', () => {
    expect(
      buildTauriArguments(
        ['--', '--config-dir', 'C:\\temp\\agc-dev-config'],
        testEndpoint.url,
      ),
    ).toEqual([
      'dev',
      '--config',
      '{"build":{"devUrl":"http://127.0.0.1:10005/","beforeDevCommand":""}}',
      '--',
      '--',
      '--config-dir',
      'C:\\temp\\agc-dev-config',
    ]);
  });
});

describe('AI 游戏创作 Tauri dev 生命周期', () => {
  test('前端就绪前不启动 Tauri，准备失败时清理自有服务', async () => {
    const spawnCli = vi.fn();
    const frontend = { pid: 1234 };
    const terminateTree = vi.fn(async () => ({ stopped: true }));
    await expect(
      runTauriDev([], {
        resolveDevEndpoint: resolveTestEndpoint,
        preflight: async () => {},
        prepareFrontend: async (_, { onChild }) => {
          onChild(frontend);
          expect(spawnCli).not.toHaveBeenCalled();
          throw new Error('backend failed');
        },
        spawnCli,
        terminateTree,
      }),
    ).rejects.toThrow('backend failed');
    expect(spawnCli).not.toHaveBeenCalled();
    expect(terminateTree).toHaveBeenCalledWith(frontend);
  });
  test('动态端口预检失败时不启动 Tauri CLI', async () => {
    const spawnCli = vi.fn();

    await expect(
      runTauriDev([], {
        resolveDevEndpoint: resolveTestEndpoint,
        preflight: async () => {
          throw new Error('stale AGC Vite');
        },
        spawnCli,
      }),
    ).rejects.toThrow('stale AGC Vite');

    expect(spawnCli).not.toHaveBeenCalled();
  });

  test('预检先于 CLI 启动且 CLI 退出后始终清理进程树', async () => {
    const order: string[] = [];
    const child = Object.assign(new EventEmitter(), {
      pid: 1234,
      exitCode: 1,
      signalCode: null,
      kill: vi.fn(),
    });
    const result = await runTauriDev([], {
      resolveDevEndpoint: resolveTestEndpoint,
      preflight: async () => {
        order.push('preflight');
      },
      prepareFrontend: async () => {
        order.push('frontend-ready');
      },
      prepareResources: (features) => {
        expect(Array.isArray(features)).toBe(true);
        order.push('resources');
      },
      spawnCli: () => {
        order.push('spawn');
        return child;
      },
      waitForCli: async () => {
        order.push('exit');
        return { type: 'exit', code: 1, signal: null };
      },
      terminateTree: async (receivedChild) => {
        expect(receivedChild).toBe(child);
        order.push('cleanup');
        return { stopped: true, forced: false };
      },
    });

    expect(result).toBe(1);
    expect(order).toEqual([
      'preflight',
      'resources',
      'frontend-ready',
      'spawn',
      'exit',
      'cleanup',
    ]);
  });

  const posixTest = process.platform === 'win32' ? test.skip : test;

  posixTest('Tauri CLI leader 先退出后仍收束同 PGID 的客户端后代', async () => {
    const tempDir = mkdtempSync(join(tmpdir(), 'agc-tauri-tree-'));
    const readyPath = join(tempDir, 'client-ready');
    const stoppedPath = join(tempDir, 'client-stopped');
    const descendantSource = `
      const { writeFileSync } = require('node:fs');
      const [readyPath, stoppedPath] = process.argv.slice(1);
      process.on('SIGTERM', () => {
        writeFileSync(stoppedPath, 'stopped');
        process.exit(0);
      });
      writeFileSync(readyPath, 'ready');
      setInterval(() => {}, 1000);
    `;
    const leaderSource = `
      const { existsSync } = require('node:fs');
      const { spawn } = require('node:child_process');
      const [readyPath, stoppedPath, descendantSource] = process.argv.slice(1);
      const descendant = spawn(
        process.execPath,
        ['-e', descendantSource, readyPath, stoppedPath],
        { stdio: 'ignore' },
      );
      descendant.unref();
      const timer = setInterval(() => {
        if (existsSync(readyPath)) {
          clearInterval(timer);
          process.exit(42);
        }
      }, 10);
    `;
    let cliChild;
    try {
      const result = await runTauriDev([], {
        resolveDevEndpoint: resolveTestEndpoint,
        preflight: async () => {},
        spawnCli: () => {
          cliChild = spawnChild(
            process.execPath,
            ['-e', leaderSource, readyPath, stoppedPath, descendantSource],
            { cwd: process.cwd() },
          );
          return cliChild;
        },
      });

      expect(result).toBe(42);
      await waitForFile(stoppedPath);
    } finally {
      if (Number.isInteger(cliChild?.pid)) {
        try {
          process.kill(-cliChild.pid, 'SIGKILL');
        } catch {
          // 进程组已经由启动器收束。
        }
      }
      rmSync(tempDir, { recursive: true, force: true });
    }
  });

  posixTest('客户端后代忽略 TERM 时在有界宽限后升级 KILL', async () => {
    const tempDir = mkdtempSync(join(tmpdir(), 'agc-tauri-force-tree-'));
    const readyPath = join(tempDir, 'client-ready');
    const descendantSource = `
      const { writeFileSync } = require('node:fs');
      const [readyPath] = process.argv.slice(1);
      process.on('SIGTERM', () => {});
      writeFileSync(readyPath, 'ready');
      setInterval(() => {}, 1000);
    `;
    const leaderSource = `
      const { existsSync } = require('node:fs');
      const { spawn } = require('node:child_process');
      const [readyPath, descendantSource] = process.argv.slice(1);
      const descendant = spawn(
        process.execPath,
        ['-e', descendantSource, readyPath],
        { stdio: 'ignore' },
      );
      descendant.unref();
      const timer = setInterval(() => {
        if (existsSync(readyPath)) {
          clearInterval(timer);
          process.exit(42);
        }
      }, 10);
    `;
    let cliChild;
    try {
      const result = await runTauriDev([], {
        resolveDevEndpoint: resolveTestEndpoint,
        preflight: async () => {},
        spawnCli: () => {
          cliChild = spawnChild(
            process.execPath,
            ['-e', leaderSource, readyPath, descendantSource],
            { cwd: process.cwd() },
          );
          return cliChild;
        },
        terminateTree: (child) =>
          terminateChildTree(child, {
            gracefulTimeoutMs: 50,
            forceTimeoutMs: 2000,
          }),
      });

      expect(result).toBe(42);
      expect(isProcessGroupAlive(cliChild.pid)).toBe(false);
    } finally {
      if (Number.isInteger(cliChild?.pid)) {
        try {
          process.kill(-cliChild.pid, 'SIGKILL');
        } catch {
          // 进程组已经由启动器强制收束。
        }
      }
      rmSync(tempDir, { recursive: true, force: true });
    }
  });
});

describe('AI 游戏创作 Tauri dev 进程环境', () => {
  const posixTest = process.platform === 'win32' ? test.skip : test;

  // 本机 `~/.cargo/config.toml` 或仓库级 Cargo 配置里的 sccache wrapper 只有在环境变量
  // 非空时才会被覆盖；这里必须显式写入要交给 Tauri Cargo 的 wrapper 决策结果。
  posixTest('本地 dev 不把 sccache 交给 Tauri Cargo', () => {
    const warn = vi.spyOn(console, 'warn').mockImplementation(() => {});
    try {
      const env = buildTauriDevProcessEnv(testEndpoint, {
        RUSTC_WRAPPER: 'sccache',
        CARGO_BUILD_RUSTC_WRAPPER: 'sccache',
      });

      expect(env.RUSTC_WRAPPER).toBe('/usr/bin/env');
      expect(env.CARGO_BUILD_RUSTC_WRAPPER).toBe('/usr/bin/env');
    } finally {
      warn.mockRestore();
    }
  });

  posixTest('未显式配置 wrapper 时清空两个变量', () => {
    const warn = vi.spyOn(console, 'warn').mockImplementation(() => {});
    try {
      const env = buildTauriDevProcessEnv(testEndpoint, {
        CARGO_TERM_COLOR: 'never',
      });

      expect(env.RUSTC_WRAPPER).toBe('');
      expect(env.CARGO_BUILD_RUSTC_WRAPPER).toBe('');
      expect(env.CARGO_TERM_COLOR).toBe('never');
    } finally {
      warn.mockRestore();
    }
  });

  posixTest('保留显式自定义 wrapper 且不改写调用方 env', () => {
    const warn = vi.spyOn(console, 'warn').mockImplementation(() => {});
    try {
      const input = { RUSTC_WRAPPER: '/opt/custom/rustc-wrapper' };
      const env = buildTauriDevProcessEnv(testEndpoint, input);

      expect(env.RUSTC_WRAPPER).toBe('/opt/custom/rustc-wrapper');
      expect(env.CARGO_BUILD_RUSTC_WRAPPER).toBe('/opt/custom/rustc-wrapper');
      expect(env.GENARRATIVE_AGC_VITE_PORT).toBe(String(testEndpoint.port));
      expect(input).toEqual({ RUSTC_WRAPPER: '/opt/custom/rustc-wrapper' });
    } finally {
      warn.mockRestore();
    }
  });
});

describe('AI 游戏创作 Tauri dev 随包资源准备目标', () => {
  const windowsFeatures = [
    'cocos-editor-execute',
    'unity-editor-execute',
    'godot-editor-execute',
  ];
  // buildTauriArguments 注入的动态 devUrl 配置：最终交给 Tauri 的参数里长这样。
  const devConfig =
    '{"build":{"devUrl":"http://127.0.0.1:10005/","beforeDevCommand":""}}';

  test('显式 --target 决定 staging 目标，未指定或属于应用参数时回落宿主目标', () => {
    const calls: [string, string[]][] = [];
    const hostTarget = 'aarch64-apple-darwin';
    const prepare = (options: {
      target: string;
      features: Iterable<string>;
    }) => {
      calls.push([options.target, [...options.features]]);
      return [];
    };

    for (const argv of [
      ['dev', '--config', devConfig],
      ['dev', '--target', 'x86_64-apple-darwin', '--config', devConfig],
      ['dev', '--target=x86_64-pc-windows-msvc', '--config', devConfig],
      // 启动器把 `--` 之后的参数交给应用（补成第二段分隔符）：不能拿它改随包资源目标。
      [
        'dev',
        '--config',
        devConfig,
        '--',
        '--',
        '--target=x86_64-pc-windows-msvc',
      ],
    ]) {
      prepareBundledResourcesBeforeTauri(windowsFeatures, argv, {
        hostTarget,
        prepare,
        log: () => {},
      });
    }

    expect(calls.map(([target]) => target)).toEqual([
      hostTarget,
      'x86_64-apple-darwin',
      'x86_64-pc-windows-msvc',
      hostTarget,
    ]);
    expect(calls[0][1]).toEqual(windowsFeatures);
  });

  test('宿主平台不受声明覆盖时跳过准备，且不为其新增随包支持', () => {
    const prepare = vi.fn();
    const log = vi.fn();

    prepareBundledResourcesBeforeTauri(
      windowsFeatures,
      ['dev', '--config', devConfig],
      { hostTarget: null, prepare, log },
    );

    expect(prepare).not.toHaveBeenCalled();
    expect(log.mock.calls.flat().join('\n')).toContain('跳过随包资源准备');
  });

  async function runCapturingDev(argv: string[]) {
    const prepared: unknown[][] = [];
    const spawned: string[][] = [];
    const child = Object.assign(new EventEmitter(), {
      pid: 1234,
      exitCode: 0,
      signalCode: null,
      kill: vi.fn(),
    });
    const result = await runTauriDev(argv, {
      resolveDevEndpoint: resolveTestEndpoint,
      preflight: async () => {},
      prepareResources: (...args: unknown[]) => {
        prepared.push(args);
      },
      spawnCli: (args: string[]) => {
        spawned.push(args);
        return child;
      },
      waitForCli: async () => ({ type: 'exit', code: 0, signal: null }),
      terminateTree: async () => ({ stopped: true, forced: false }),
    });
    return { result, prepared, spawned };
  }

  test('显式 -f 优先于环境变量，并同时决定随包资源 feature 与 cargo 参数', async () => {
    vi.stubEnv('AGC_DEV_CARGO_FEATURES', 'template-library-fixtures');
    try {
      const { result, prepared, spawned } = await runCapturingDev([
        '-f',
        'custom-feature',
      ]);

      expect(result).toBe(0);
      expect(prepared.map(([features]) => features)).toEqual([
        ['custom-feature'],
      ]);
      expect(spawned[0].slice(0, 3)).toEqual(['dev', '-f', 'custom-feature']);
      expect(spawned[0]).not.toContain(
        `--features=${windowsFeatures.join(',')}`,
      );
      // 随包资源准备拿到的是最终交给 Tauri 的参数，不是启动器收到的原始参数。
      expect(prepared[0][1]).toEqual(spawned[0]);
    } finally {
      vi.unstubAllEnvs();
    }
  });

  test('显式 --target 同时进入随包资源准备与 Tauri 参数', async () => {
    vi.stubEnv('AGC_DEV_CARGO_FEATURES', '');
    try {
      const { result, prepared, spawned } = await runCapturingDev([
        '--target',
        'x86_64-apple-darwin',
      ]);

      expect(result).toBe(0);
      expect(prepared.map(([features]) => features)).toEqual([[]]);
      expect(prepared[0][1]).toEqual([
        'dev',
        '--target',
        'x86_64-apple-darwin',
        '--config',
        devConfig,
      ]);
      expect(spawned[0]).toEqual(prepared[0][1]);
    } finally {
      vi.unstubAllEnvs();
    }
  });

  test('启动器 `--` 之后的应用参数不参与 staging feature 解析', async () => {
    vi.stubEnv('AGC_DEV_CARGO_FEATURES', '');
    try {
      const { result, prepared, spawned } = await runCapturingDev([
        '--',
        '--features=app-tool',
      ]);

      expect(result).toBe(0);
      expect(prepared.map(([features]) => features)).toEqual([[]]);
      expect(spawned[0]).toEqual([
        'dev',
        '--config',
        devConfig,
        '--',
        '--',
        '--features=app-tool',
      ]);
      expect(prepared[0][1]).toEqual(spawned[0]);
    } finally {
      vi.unstubAllEnvs();
    }
  });

  test('空串 AGC_DEV_CARGO_FEATURES 关闭默认 feature，staging 与 cargo 都不带 feature', async () => {
    vi.stubEnv('AGC_DEV_CARGO_FEATURES', '');
    try {
      const { result, prepared, spawned } = await runCapturingDev([]);

      expect(result).toBe(0);
      expect(prepared.map(([features]) => features)).toEqual([[]]);
      expect(
        spawned[0].some((argument) => argument.startsWith('--features')),
      ).toBe(false);
    } finally {
      vi.unstubAllEnvs();
    }
  });

  test('环境变量只在不与显式 CLI 冲突时生效', () => {
    vi.stubEnv('AGC_DEV_CARGO_FEATURES', 'template-library-fixtures');
    try {
      expect(
        resolveEditorFeatures({
          argv: ['dev', '--config', devConfig],
          target: 'win32',
        }),
      ).toEqual(['template-library-fixtures']);
      expect(
        resolveEditorFeatures({
          argv: ['dev', '-f', 'cli-feature', '--config', devConfig],
          target: 'win32',
        }),
      ).toEqual(['cli-feature']);
    } finally {
      vi.unstubAllEnvs();
    }
  });
});

describe('AI 游戏创作 Tauri dev 目标与 feature 解析', () => {
  test('目标只从构建参数区解析，取值缺失、取到选项或重复都失败关闭', () => {
    expect(readCargoTarget([])).toBeUndefined();
    expect(readCargoTarget(['--no-watch'])).toBeUndefined();
    expect(readCargoTarget(['-t', 'x86_64-apple-darwin'])).toBe(
      'x86_64-apple-darwin',
    );
    expect(readCargoTarget(['--target=x86_64-apple-darwin'])).toBe(
      'x86_64-apple-darwin',
    );
    // runner 参数由 Tauri 追加给 cargo：仍然算构建目标。
    expect(
      readCargoTarget(['build', '--', '--target=aarch64-apple-darwin']),
    ).toBe('aarch64-apple-darwin');
    // 第二个 `--` 之后是应用参数。
    expect(
      readCargoTarget(['dev', '--', '--', '--target=aarch64-apple-darwin']),
    ).toBeUndefined();
    expect(() => readCargoTarget(['--target'])).toThrow('缺少有效目标');
    expect(() => readCargoTarget(['--target', '--no-watch'])).toThrow(
      '缺少有效目标',
    );
    expect(() => readCargoTarget(['--target', 'a', '-t', 'b'])).toThrow(
      '不能重复指定',
    );
  });

  test('feature 解析覆盖 -f 拼写、合并多个 flag 并止步于应用参数', () => {
    const cases: [string[], string[]][] = [
      [
        ['-f', 'a,b'],
        ['a', 'b'],
      ],
      [['-fa'], ['a']],
      [['--features=explicit'], ['explicit']],
      // Cargo 会合并多个 feature flag：staging 必须拿到同一集合。
      [
        ['--features', 'a', '-f', 'b'],
        ['a', 'b'],
      ],
      // 显式给空集合即关闭默认，而不是回落默认值。
      [['--features='], []],
      // 第二个 `--` 之后是应用参数。
      [
        ['dev', '--config', '{}', '--', '--', '-f', 'app-feature'],
        [
          'cocos-editor-execute',
          'unity-editor-execute',
          'godot-editor-execute',
        ],
      ],
    ];

    for (const [argv, expected] of cases) {
      expect(resolveEditorFeatures({ argv, target: 'win32', env: {} })).toEqual(
        expected,
      );
    }
  });
});