import { resolve } from 'node:path';
import { fileURLToPath } from 'node:url';

import {
  preflightExistingVite,
  resolveDevStackProfile,
  spawnChild,
  stopChild,
  terminateChildTree,
  waitForChildTermination,
} from './start-dev-stack.mjs';

const appRoot = fileURLToPath(new URL('..', import.meta.url));
const repoRoot = resolve(appRoot, '../..');
const tauriCliPath = resolve(repoRoot, 'node_modules/@tauri-apps/cli/tauri.js');

function parseLauncherArguments(argv) {
  const args = [...argv];
  const appRun = args[0] === '--app-run';
  if (appRun) {
    args.shift();
  }
  const gameChat = args[0] === '--game-chat';
  if (gameChat) {
    args.shift();
  }
  if (appRun && gameChat) {
    throw new Error('app-run profile 不能与 game-chat 入口同时使用');
  }
  return { appRun, gameChat, args };
}

function buildTauriArguments(argv) {
  const { appRun, gameChat, args } = parseLauncherArguments(argv);
  if (appRun) {
    return [
      'dev',
      '--config',
      'src-tauri/tauri.app-run-dev.conf.json',
      ...args,
    ];
  }
  if (gameChat) {
    return ['dev', '--', '--', '--game-chat', ...args];
  }
  return ['dev', ...args];
}

function spawnTauriCli(argv, { profileName = 'default' } = {}) {
  return spawnChild(process.execPath, [tauriCliPath, ...argv], {
    cwd: appRoot,
    env: {
      ...process.env,
      GENARRATIVE_AGC_DEV_PROFILE: profileName,
    },
    shell: false,
  });
}

async function runTauriDev(
  argv = process.argv.slice(2),
  {
    preflight = preflightExistingVite,
    spawnCli = spawnTauriCli,
    waitForCli = waitForChildTermination,
    terminateTree = terminateChildTree,
  } = {},
) {
  const { appRun } = parseLauncherArguments(argv);
  const profile = resolveDevStackProfile(appRun ? 'app-run' : 'default');
  await preflight({ profile });

  const tauriArguments = buildTauriArguments(argv);
  const child = spawnCli(tauriArguments, { profileName: profile.name });
  let resolveShutdown;
  let shutdownSignal = '';
  let repeatedSignal = false;
  const shutdownRequested = new Promise((resolveRequest) => {
    resolveShutdown = resolveRequest;
  });
  const signalHandlers = new Map();

  for (const signal of ['SIGINT', 'SIGTERM']) {
    const handler = () => {
      if (!shutdownSignal) {
        shutdownSignal = signal;
        stopChild(child, 'SIGTERM');
        resolveShutdown(signal);
        return;
      }
      repeatedSignal = true;
      stopChild(child, 'SIGKILL');
    };
    signalHandlers.set(signal, handler);
    process.on(signal, handler);
  }

  try {
    const childResult = waitForCli(child);
    const outcome = await Promise.race([
      childResult.then((failure) => ({ type: 'exit', failure })),
      shutdownRequested.then((signal) => ({ type: 'signal', signal })),
    ]);
    const cleanup = await terminateTree(child, {
      gracefulTimeoutMs: repeatedSignal ? 0 : 2500,
    });
    if (!cleanup.stopped) {
      console.error(
        '[ai-game-creator-shell] Tauri dev exited, but its process tree could not be fully stopped.',
      );
      return 1;
    }

    if (outcome.type === 'signal') {
      return 1;
    }
    const { failure } = outcome;
    return failure.type === 'error' || failure.signal ? 1 : (failure.code ?? 0);
  } finally {
    for (const [signal, handler] of signalHandlers) {
      process.off(signal, handler);
    }
  }
}

function isDirectModuleExecution() {
  return Boolean(
    process.argv[1] &&
      resolve(process.argv[1]) === fileURLToPath(import.meta.url),
  );
}

export {
  buildTauriArguments,
  isDirectModuleExecution,
  parseLauncherArguments,
  runTauriDev,
  spawnTauriCli,
};

if (isDirectModuleExecution()) {
  try {
    process.exitCode = await runTauriDev();
  } catch (error) {
    console.error(
      `[ai-game-creator-shell] ${error instanceof Error ? error.message : String(error)}`,
    );
    process.exitCode = 1;
  }
}