discordeno/utils/permissions.ts

import { Permission, Permissions } from "../types/permission.ts"
import { Role_Data } from "../types/role.ts"
import { cache } from "./cache.ts"

export const member_has_permission = (
  member_id: string,
  owner_id: string,
  role_data: Role_Data[],
  member_role_ids: string[],
  permissions: Permission[]
) => {
  if (member_id === owner_id) return true

  const permissionBits = role_data
    .filter(role => member_role_ids.includes(role.id))
    .reduce((bits, data) => {
      bits |= data.permissions

      return bits
    }, 0)

  if (permissionBits & Permissions.ADMINISTRATOR) return true

  return permissions.every(permission => permissionBits & Permissions[permission])
}

export const bot_has_permission = (guild_id: string, bot_id: string, permissions: Permissions[]) => {
  const guild = cache.guilds.get(guild_id)
  if (!guild) return false

  const member = guild.members.get(bot_id)
  if (!member) return false

  const permissionBits = [...guild.roles().values()]
    .map(role => role.raw())
    .filter(role => member.roles().includes(role.id))
    .reduce((bits, data) => {
      bits |= data.permissions

      return bits
    }, 0)

  if (permissionBits & Permissions.ADMINISTRATOR) return true

  return permissions.every(permission => permissionBits & permission)
}

export const calculate_permissions = (permission_bits: number) => {
  return Object.keys(Permissions).filter(perm => {
    return permission_bits & Permissions[perm as Permission]
  })
}