import { Role } from '@roleypoly/types';

export const evaluatePermission = <T extends number | bigint>(
  haystack: T,
  needle: T
): boolean => {
  return (haystack & needle) === needle;
};

export const hasPermission = (roles: Role[], permission: bigint): boolean => {
  const aggregateRoles = roles.reduce(
    (acc, role) => acc | BigInt(role.permissions),
    BigInt(0)
  );
  return evaluatePermission(aggregateRoles, permission);
};

export const hasPermissionOrAdmin = (roles: Role[], permission: bigint): boolean =>
  hasPermission(roles, permission | permissions.ADMINISTRATOR);

export const permissions = {
  // IMPORTANT: Only uncomment what's actually used. All are left for convenience.

  // CREATE_INSTANT_INVITE: BigInt(0x1),
  // KICK_MEMBERS: BigInt(0x2),
  // BAN_MEMBERS: BigInt(0x4),
  ADMINISTRATOR: BigInt(0x8),
  // MANAGE_CHANNELS: BigInt(0x10),
  // MANAGE_GUILD: BigInt(0x20),
  // ADD_REACTIONS: BigInt(0x40),
  // VIEW_AUDIT_LOG: BigInt(0x80),
  // VIEW_CHANNEL: BigInt(0x400),
  // SEND_MESSAGES: BigInt(0x800),
  // SEND_TTS_MESSAGES: BigInt(0x1000),
  // MANAGE_MESSAGES: BigInt(0x2000),
  // EMBED_LINKS: BigInt(0x4000),
  // ATTACH_FILES: BigInt(0x8000),
  // READ_MESSAGE_HISTORY: BigInt(0x10000),
  // MENTION_EVERYONE: BigInt(0x20000),
  // USE_EXTERNAL_EMOJIS: BigInt(0x40000),
  // VIEW_GUILD_INSIGHTS: BigInt(0x80000),
  // CONNECT: BigInt(0x100000),
  // SPEAK: BigInt(0x200000),
  // MUTE_MEMBERS: BigInt(0x400000),
  // DEAFEN_MEMBERS: BigInt(0x800000),
  // MOVE_MEMBERS: BigInt(0x1000000),
  // USE_VAD: BigInt(0x2000000),
  // PRIORITY_SPEAKER: BigInt(0x100),
  // STREAM: BigInt(0x200),
  // CHANGE_NICKNAME: BigInt(0x4000000),
  // MANAGE_NICKNAMES: BigInt(0x8000000),
  MANAGE_ROLES: BigInt(0x10000000),
  // MANAGE_WEBHOOKS: BigInt(0x20000000),
  // MANAGE_EMOJIS: BigInt(0x40000000),
};