import { existsSync, readFileSync } from 'node:fs';
import { isAbsolute, resolve } from 'node:path';
import { spawn } from 'node:child_process';

const root = resolve(import.meta.dirname, '..');
const localEnvPath = resolve(root, '.env.local');

const parseEnvFile = (path) => {
  if (!existsSync(path)) return {};
  const result = {};
  for (const rawLine of readFileSync(path, 'utf8').split(/\r?\n/u)) {
    const line = rawLine.trim();
    if (!line || line.startsWith('#')) continue;
    const separator = line.indexOf('=');
    if (separator < 1) throw new Error(`Invalid environment line in ${path}: ${rawLine}`);
    const key = line.slice(0, separator).trim();
    let value = line.slice(separator + 1).trim();
    if ((value.startsWith('"') && value.endsWith('"')) || (value.startsWith("'") && value.endsWith("'"))) {
      value = value.slice(1, -1);
    }
    result[key] = value;
  }
  return result;
};

const localEnv = parseEnvFile(localEnvPath);
const pathDefaults = {
  BOTSU_DRAWING_STORE_ROOT: '.data/drawings',
  BOTSU_DOCUMENT_STORE_ROOT: '.data/documents',
  BOTSU_COOKIE_STORE_ROOT: '.data/cookies',
  BOTSU_TCG_STORE_ROOT: '.data/tcg',
  BOTSU_MOODBOARD_STORE_ROOT: '.data/moodboard',
  BOTSU_RADIO_STORE_ROOT: '.data/radio',
  TCG_CATALOG_INDEX_PATH: '.data/tcg/catalog-index.json',
  EMOJI_KITCHEN_ROOT: '.data/emoji-kitchen/stickers',
};

const env = {
  BOTSU_DEV_HOST: '127.0.0.1',
  BOTSU_DEV_PORT: '5173',
  BOTSU_DEV_ALLOWED_HOSTS: 'localhost,127.0.0.1',
  BOTSU_PRESENCE_PROXY_URL: 'http://127.0.0.1:8091',
  HOST: '127.0.0.1',
  PORT: '8091',
  PRESENCE_ALLOWED_ORIGIN: 'http://127.0.0.1:5173,http://localhost:5173',
  MATRIX_HOMESERVER: 'botsu.net',
  ...localEnv,
  ...process.env,
};

for (const [key, value] of Object.entries(pathDefaults)) {
  const configured = env[key] ?? value;
  env[key] = isAbsolute(configured) ? configured : resolve(root, configured);
}

const npm = process.platform === 'win32' ? 'npm.cmd' : 'npm';
const children = [
  spawn(npm, ['run', 'dev:api'], { cwd: root, env, stdio: 'inherit', detached: process.platform !== 'win32' }),
  spawn(npm, ['run', 'dev:client'], { cwd: root, env, stdio: 'inherit', detached: process.platform !== 'win32' }),
];

let stopping = false;
const stop = (signal = 'SIGTERM') => {
  if (stopping) return;
  stopping = true;
  for (const child of children) {
    if (!child.pid || child.exitCode !== null) continue;
    try {
      process.kill(process.platform === 'win32' ? child.pid : -child.pid, signal);
    } catch (error) {
      if (error.code !== 'ESRCH') throw error;
    }
  }
};

for (const signal of ['SIGINT', 'SIGTERM']) {
  process.once(signal, () => stop(signal));
}

for (const child of children) {
  child.once('error', (error) => {
    console.error(error);
    stop();
    process.exitCode = 1;
  });
  child.once('exit', (code, signal) => {
    if (!stopping) {
      if (code !== 0) console.error(`Local service stopped (${signal ?? `exit ${code}`}).`);
      stop();
      process.exitCode = code ?? 1;
    }
  });
}