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

const here = path.dirname(fileURLToPath(import.meta.url));
export const SERVER_ROOT = path.resolve(here, '..');
export const REPO_ROOT = path.resolve(SERVER_ROOT, '..');

dotenv.config({ path: path.join(REPO_ROOT, '.env') });

function int(name, fallback) {
  const raw = process.env[name];
  if (raw === undefined || raw === '') return fallback;
  const value = Number.parseInt(raw, 10);
  if (Number.isNaN(value)) throw new Error(`Umgebungsvariable ${name} muss eine Zahl sein (ist: "${raw}")`);
  return value;
}

function bool(name, fallback) {
  const raw = process.env[name];
  if (raw === undefined || raw === '') return fallback;
  return ['1', 'true', 'yes', 'ja', 'on'].includes(raw.toLowerCase());
}

function str(name, fallback = '') {
  const raw = process.env[name];
  return raw === undefined || raw === '' ? fallback : raw;
}

export function loadConfig(overrides = {}) {
  const config = {
    port: int('PORT', 3000),
    publicUrl: str('PUBLIC_URL', 'http://localhost:5173').replace(/\/$/, ''),
    databaseFile: path.resolve(REPO_ROOT, str('DATABASE_FILE', 'data/cs2-mapveto.db')),
    mapPoolFile: path.resolve(REPO_ROOT, str('MAP_POOL_FILE', 'server/config/map-pools.json')),
    createMatchPassword: str('CREATE_MATCH_PASSWORD'),
    requireFullTeams: bool('REQUIRE_FULL_TEAMS', false),
    trustProxy: bool('TRUST_PROXY', false),

    serverAdapter: str('SERVER_ADAPTER', 'demo'),
    idleTimeoutMinutes: int('SERVER_IDLE_TIMEOUT_MINUTES', 30),
    maxLifetimeHours: int('SERVER_MAX_LIFETIME_HOURS', 8),
    statusPollSeconds: int('SERVER_STATUS_POLL_SECONDS', 5),
    reaperIntervalSeconds: int('SERVER_REAPER_INTERVAL_SECONDS', 60),

    match: {
      tvDelaySeconds: int('CS2_TV_DELAY', 90),
      tvEnabled: bool('CS2_TV_ENABLE', true),
      maxRoundsCompetitive: int('CS2_MAXROUNDS_COMPETITIVE', 24),
      maxRoundsWingman: int('CS2_MAXROUNDS_WINGMAN', 16),
      overtime: bool('CS2_OVERTIME', true),
      extraCommands: str('CS2_EXTRA_COMMANDS')
        .split(';')
        .map((c) => c.trim())
        .filter(Boolean),
    },

    demo: {
      startSeconds: int('DEMO_START_SECONDS', 20),
      failFirstConfigure: bool('DEMO_FAIL_FIRST_CONFIGURE', false),
    },

    docker: {
      bin: str('DOCKER_BIN', 'docker'),
      image: str('CS2_DOCKER_IMAGE', 'cm2network/cs2:latest'),
      host: str('CS2_PUBLIC_HOST'),
      rconHost: str('CS2_RCON_HOST', '127.0.0.1'),
      portRangeStart: int('CS2_PORT_RANGE_START', 27015),
      portRangeEnd: int('CS2_PORT_RANGE_END', 27115),
      gslt: str('CS2_GSLT'),
      volume: str('CS2_DOCKER_VOLUME', 'cs2-mapveto-gamefiles'),
      extraArgs: str('CS2_DOCKER_EXTRA_ARGS'),
      startTimeoutMinutes: int('CS2_START_TIMEOUT_MINUTES', 20),
    },

    staticPool: {
      // Format: host:port:rconPasswort[:tvPort], mehrere durch Komma getrennt
      servers: str('CS2_STATIC_SERVERS')
        .split(',')
        .map((s) => s.trim())
        .filter(Boolean)
        .map(parseStaticServer),
    },
  };
  return deepMerge(config, overrides);
}

function parseStaticServer(entry) {
  const parts = entry.split(':');
  if (parts.length < 3) {
    throw new Error(`CS2_STATIC_SERVERS-Eintrag "${entry}" hat nicht das Format host:port:rconPasswort[:tvPort]`);
  }
  const [host, port, ...rest] = parts;
  let tvPort = null;
  // Das Passwort darf Doppelpunkte enthalten; ein abschließender rein numerischer Teil ist der TV-Port.
  if (rest.length > 1 && /^\d+$/.test(rest[rest.length - 1])) tvPort = Number(rest.pop());
  return { host, port: Number(port), rconPassword: rest.join(':'), tvPort: tvPort ?? Number(port) + 5 };
}

function deepMerge(target, source) {
  for (const [key, value] of Object.entries(source)) {
    if (value && typeof value === 'object' && !Array.isArray(value) && typeof target[key] === 'object') {
      deepMerge(target[key], value);
    } else {
      target[key] = value;
    }
  }
  return target;
}