import electronBinaryPath from 'electron';
import { _electron as electron, expect, test as base, type ElectronApplication, type Page } from '@playwright/test';
import { mkdir, mkdtemp, rm } from 'node:fs/promises';
import { createServer } from 'node:net';
import { tmpdir } from 'node:os';
import { join, resolve } from 'node:path';

type LaunchElectronOptions = {
  skipSetup?: boolean;
};

type IpcMockConfig = {
  gatewayStatus?: Record<string, unknown>;
  gatewayRpc?: Record<string, unknown>;
  hostApi?: Record<string, unknown>;
};

type ElectronFixtures = {
  electronApp: ElectronApplication;
  page: Page;
  homeDir: string;
  userDataDir: string;
  launchElectronApp: (options?: LaunchElectronOptions) => Promise<ElectronApplication>;
};

const repoRoot = resolve(process.cwd());
const electronEntry = join(repoRoot, 'dist-electron/main/index.js');

async function allocatePort(): Promise<number> {
  return await new Promise((resolvePort, reject) => {
    const server = createServer();
    server.once('error', reject);
    server.listen(0, '127.0.0.1', () => {
      const address = server.address();
      if (!address || typeof address === 'string') {
        server.close(() => reject(new Error('Failed to allocate an ephemeral port')));
        return;
      }
      const { port } = address;
      server.close((error) => {
        if (error) {
          reject(error);
          return;
        }
        resolvePort(port);
      });
    });
  });
}

async function getStableWindow(app: ElectronApplication): Promise<Page> {
  const deadline = Date.now() + 30_000;
  let page = await app.firstWindow();

  while (Date.now() < deadline) {
    const openWindows = app.windows().filter((candidate) => !candidate.isClosed());
    const currentWindow = openWindows.at(-1) ?? page;

    if (currentWindow && !currentWindow.isClosed()) {
      try {
        await currentWindow.waitForLoadState('domcontentloaded', { timeout: 2_000 });
        return currentWindow;
      } catch (error) {
        if (!String(error).includes('has been closed')) {
          throw error;
        }
      }
    }

    try {
      page = await app.waitForEvent('window', { timeout: 2_000 });
    } catch {
      // Keep polling until a stable window is available or the deadline expires.
    }
  }

  throw new Error('No stable Electron window became available');
}

async function closeElectronApp(app: ElectronApplication, timeoutMs = 5_000): Promise<void> {
  let closed = false;

  await Promise.race([
    (async () => {
      const [closeResult] = await Promise.allSettled([
        app.waitForEvent('close', { timeout: timeoutMs }),
        app.evaluate(({ app: electronApp }) => {
          electronApp.quit();
        }),
      ]);

      if (closeResult.status === 'fulfilled') {
        closed = true;
      }
    })(),
    new Promise((resolve) => setTimeout(resolve, timeoutMs)),
  ]);

  if (closed) {
    return;
  }

  try {
    await app.close();
    return;
  } catch {
    // Fall through to process kill if Playwright cannot close the app cleanly.
  }

  try {
    app.process().kill('SIGKILL');
  } catch {
    // Ignore process kill failures during e2e teardown.
  }
}

async function launchClawXElectron(
  homeDir: string,
  userDataDir: string,
  options: LaunchElectronOptions = {},
): Promise<ElectronApplication> {
  const hostApiPort = await allocatePort();
  const electronEnv = process.platform === 'linux'
    ? { ELECTRON_DISABLE_SANDBOX: '1' }
    : {};
  return await electron.launch({
    executablePath: electronBinaryPath,
    args: [electronEntry],
    env: {
      ...process.env,
      ...electronEnv,
      HOME: homeDir,
      USERPROFILE: homeDir,
      APPDATA: join(homeDir, 'AppData', 'Roaming'),
      LOCALAPPDATA: join(homeDir, 'AppData', 'Local'),
      XDG_CONFIG_HOME: join(homeDir, '.config'),
      CLAWX_E2E: '1',
      CLAWX_USER_DATA_DIR: userDataDir,
      ...(options.skipSetup ? { CLAWX_E2E_SKIP_SETUP: '1' } : {}),
      CLAWX_PORT_CLAWX_HOST_API: String(hostApiPort),
    },
    timeout: 90_000,
  });
}

export const test = base.extend<ElectronFixtures>({
  homeDir: async ({ browserName: _browserName }, provideHomeDir) => {
    const homeDir = await mkdtemp(join(tmpdir(), 'clawx-e2e-home-'));
    await mkdir(join(homeDir, '.config'), { recursive: true });
    await mkdir(join(homeDir, 'AppData', 'Local'), { recursive: true });
    await mkdir(join(homeDir, 'AppData', 'Roaming'), { recursive: true });
    try {
      await provideHomeDir(homeDir);
    } finally {
      await rm(homeDir, { recursive: true, force: true });
    }
  },

  userDataDir: async ({ browserName: _browserName }, provideUserDataDir) => {
    const userDataDir = await mkdtemp(join(tmpdir(), 'clawx-e2e-user-data-'));
    try {
      await provideUserDataDir(userDataDir);
    } finally {
      await rm(userDataDir, { recursive: true, force: true });
    }
  },

  launchElectronApp: async ({ homeDir, userDataDir }, provideLauncher) => {
    await provideLauncher(async (options?: LaunchElectronOptions) => await launchClawXElectron(homeDir, userDataDir, options));
  },

  electronApp: async ({ launchElectronApp }, provideElectronApp) => {
    const app = await launchElectronApp();
    let appClosed = false;
    app.once('close', () => {
      appClosed = true;
    });

    try {
      await provideElectronApp(app);
    } finally {
      if (!appClosed) {
        await closeElectronApp(app);
      }
    }
  },

  page: async ({ electronApp }, providePage) => {
    const page = await getStableWindow(electronApp);
    await providePage(page);
  },
});

export async function completeSetup(page: Page): Promise<void> {
  await expect(page.getByTestId('setup-page')).toBeVisible();
  await page.getByTestId('setup-skip-button').click();
  await expect(page.getByTestId('main-layout')).toBeVisible();
}

export { closeElectronApp };
export { getStableWindow };
export { expect };

export async function installIpcMocks(
  app: ElectronApplication,
  config: IpcMockConfig,
): Promise<void> {
  await app.evaluate(
    async ({ app: _app }, mockConfig) => {
      const { ipcMain } = process.mainModule!.require('electron') as typeof import('electron');
      const stableStringify = (value: unknown): string => {
        if (value == null || typeof value !== 'object') return JSON.stringify(value);
        if (Array.isArray(value)) return `[${value.map((item) => stableStringify(item)).join(',')}]`;
        const entries = Object.entries(value as Record<string, unknown>)
          .sort(([left], [right]) => left.localeCompare(right))
          .map(([key, entryValue]) => `${JSON.stringify(key)}:${stableStringify(entryValue)}`);
        return `{${entries.join(',')}}`;
      };

      if (mockConfig.gatewayRpc) {
        ipcMain.removeHandler('gateway:rpc');
        ipcMain.handle('gateway:rpc', async (_event: unknown, method: string, payload: unknown) => {
          const key = stableStringify([method, payload ?? null]);
          if (key in mockConfig.gatewayRpc!) {
            return mockConfig.gatewayRpc![key];
          }
          const fallbackKey = stableStringify([method, null]);
          if (fallbackKey in mockConfig.gatewayRpc!) {
            return mockConfig.gatewayRpc![fallbackKey];
          }
          return { success: true, result: {} };
        });
      }

      if (mockConfig.hostApi) {
        ipcMain.removeHandler('hostapi:fetch');
        ipcMain.handle('hostapi:fetch', async (_event: unknown, request: { path?: string; method?: string }) => {
          const key = stableStringify([request?.path ?? '', request?.method ?? 'GET']);
          if (key in mockConfig.hostApi!) {
            return mockConfig.hostApi![key];
          }
          return {
            ok: true,
            data: { status: 200, ok: true, json: {} },
          };
        });
      }

      if (mockConfig.gatewayStatus) {
        ipcMain.removeHandler('gateway:status');
        ipcMain.handle('gateway:status', async () => mockConfig.gatewayStatus);
      }
    },
    config,
  );
}