// Discord-Rechtebits. Die Werte sind ein 64-Bit-Feld und werden in der API
// als Dezimalstring uebertragen - deshalb BigInt und nicht number.
//
// Kein `enum`: Node fuehrt die .ts-Dateien direkt aus und entfernt nur Typen,
// ein enum waere zur Laufzeit weg (ADR-0001, `erasableSyntaxOnly`).

export const P = {
  CREATE_INSTANT_INVITE: 1n << 0n,
  KICK_MEMBERS: 1n << 1n,
  BAN_MEMBERS: 1n << 2n,
  ADMINISTRATOR: 1n << 3n,
  MANAGE_CHANNELS: 1n << 4n,
  MANAGE_GUILD: 1n << 5n,
  ADD_REACTIONS: 1n << 6n,
  VIEW_AUDIT_LOG: 1n << 7n,
  PRIORITY_SPEAKER: 1n << 8n,
  STREAM: 1n << 9n,
  VIEW_CHANNEL: 1n << 10n,
  SEND_MESSAGES: 1n << 11n,
  SEND_TTS_MESSAGES: 1n << 12n,
  MANAGE_MESSAGES: 1n << 13n,
  EMBED_LINKS: 1n << 14n,
  ATTACH_FILES: 1n << 15n,
  READ_MESSAGE_HISTORY: 1n << 16n,
  MENTION_EVERYONE: 1n << 17n,
  USE_EXTERNAL_EMOJIS: 1n << 18n,
  VIEW_GUILD_INSIGHTS: 1n << 19n,
  CONNECT: 1n << 20n,
  SPEAK: 1n << 21n,
  MUTE_MEMBERS: 1n << 22n,
  DEAFEN_MEMBERS: 1n << 23n,
  MOVE_MEMBERS: 1n << 24n,
  USE_VAD: 1n << 25n,
  CHANGE_NICKNAME: 1n << 26n,
  MANAGE_NICKNAMES: 1n << 27n,
  MANAGE_ROLES: 1n << 28n,
  MANAGE_WEBHOOKS: 1n << 29n,
  MANAGE_GUILD_EXPRESSIONS: 1n << 30n,
  USE_APPLICATION_COMMANDS: 1n << 31n,
  REQUEST_TO_SPEAK: 1n << 32n,
  MANAGE_EVENTS: 1n << 33n,
  MANAGE_THREADS: 1n << 34n,
  CREATE_PUBLIC_THREADS: 1n << 35n,
  CREATE_PRIVATE_THREADS: 1n << 36n,
  USE_EXTERNAL_STICKERS: 1n << 37n,
  SEND_MESSAGES_IN_THREADS: 1n << 38n,
  USE_EMBEDDED_ACTIVITIES: 1n << 39n,
  MODERATE_MEMBERS: 1n << 40n,
  USE_SOUNDBOARD: 1n << 42n,
  CREATE_EVENTS: 1n << 44n,
  USE_EXTERNAL_SOUNDS: 1n << 45n,
  SEND_VOICE_MESSAGES: 1n << 46n,
  SEND_POLLS: 1n << 49n,
} as const;

export type PermName = keyof typeof P;

/** Vereinigt mehrere Rechte zu einem Bitfeld. */
export function bits(...names: PermName[]): bigint {
  let out = 0n;
  for (const n of names) out |= P[n];
  return out;
}

/** Wie die API es erwartet: Dezimalstring. */
export const str = (v: bigint): string => v.toString();

/** Namen eines Bitfelds - nur fuer die Vorschau und Fehlermeldungen. */
export function names(value: bigint): PermName[] {
  const out: PermName[] = [];
  for (const [name, bit] of Object.entries(P) as Array<[PermName, bigint]>) {
    if ((value & bit) === bit) out.push(name);
  }
  return out;
}