/**
 * Centralised, typed configuration loaded from environment (.env at repo root).
 * Nothing else in the bot reads process.env directly.
 */
import "dotenv/config";

function req(name: string): string {
  const v = process.env[name];
  if (!v) throw new Error(`Missing required env var: ${name} (see .env.example)`);
  return v;
}

function opt(name: string, fallback = ""): string {
  return process.env[name] ?? fallback;
}

export type StreamBackend = "selfbot" | "novnc" | "screenshot" | "none";

export const config = {
  // --- Normal Discord bot (voice I/O, slash commands) ---
  botToken: req("DISCORD_BOT_TOKEN"),
  appId: req("DISCORD_APP_ID"),
  guildId: req("DISCORD_GUILD_ID"),

  // --- Python brain bridge ---
  bridgeUrl: opt("BRIDGE_URL", "http://127.0.0.1:8765"),

  // --- VNC screen broadcast ---
  // selfbot   = real live "Go Live" stream via a user (burner) account token
  // novnc     = post a noVNC web link the channel can open in a browser
  // screenshot= periodically upload VNC screenshots
  // none      = disable screen sharing
  streamBackend: (opt("STREAM_BACKEND", "selfbot") as StreamBackend),

  // x11grab source for the VNC display (TigerVNC runs the desktop on :1)
  vncDisplay: opt("VNC_DISPLAY", ":1"),
  vncResolution: opt("VNC_RESOLUTION", "1920x1080"),
  vncFramerate: parseInt(opt("VNC_FRAMERATE", "30"), 10),
  vncBitrateKbps: parseInt(opt("VNC_BITRATE_KBPS", "4000"), 10),

  // selfbot backend (ToS-risk; use a throwaway account token, never your main)
  selfbotToken: opt("DISCORD_SELFBOT_TOKEN"),

  // novnc backend
  novncUrl: opt("NOVNC_URL", ""),

  // screenshot backend
  screenshotIntervalSec: parseInt(opt("SCREENSHOT_INTERVAL_SEC", "5"), 10),

  // --- Voice behaviour ---
  // Min/max captured utterance bounds (ms) before forwarding to the brain.
  silenceMs: parseInt(opt("VOICE_SILENCE_MS", "800"), 10),
};

export type AppConfig = typeof config;