'use strict';

const BitField = require('./BitField');

/**
 * Data structure that makes it easy to interact with a permission bitfield. All {@link GuildMember}s have a set of
 * permissions in their guild, and each channel in the guild may also have {@link PermissionOverwrites} for the member
 * that override their default permissions.
 * @extends {BitField}
 */
class Permissions extends BitField {
  /**
   * @name Permissions
   * @kind constructor
   * @memberof Permissions
   * @param {PermissionResolvable} [bits=0] Bit(s) to read from
   */

  /**
   * Data that can be resolved to give a permission number. This can be:
   * * A string (see {@link Permissions.FLAGS})
   * * A permission number
   * * An instance of Permissions
   * * An Array of PermissionResolvable
   * @typedef {string|number|Permissions|PermissionResolvable[]} PermissionResolvable
   */

  /**
   * Checks whether the bitfield has a permission, or any of multiple permissions.
   * @param {PermissionResolvable} permission Permission(s) to check for
   * @param {boolean} [checkAdmin=true] Whether to allow the administrator permission to override
   * @returns {boolean}
   */
  any(permission, checkAdmin = true) {
    return (checkAdmin && super.has(this.constructor.FLAGS.ADMINISTRATOR)) || super.any(permission);
  }

  /**
   * Checks whether the bitfield has a permission, or multiple permissions.
   * @param {PermissionResolvable} permission Permission(s) to check for
   * @param {boolean} [checkAdmin=true] Whether to allow the administrator permission to override
   * @returns {boolean}
   */
  has(permission, checkAdmin = true) {
    return (checkAdmin && super.has(this.constructor.FLAGS.ADMINISTRATOR)) || super.has(permission);
  }
}

/**
 * Numeric permission flags. All available properties:
 * * `ADMINISTRATOR` (implicitly has *all* permissions, and bypasses all channel overwrites)
 * * `CREATE_INSTANT_INVITE` (create invitations to the guild)
 * * `KICK_MEMBERS`
 * * `BAN_MEMBERS`
 * * `MANAGE_CHANNELS` (edit and reorder channels)
 * * `MANAGE_GUILD` (edit the guild information, region, etc.)
 * * `ADD_REACTIONS` (add new reactions to messages)
 * * `VIEW_AUDIT_LOG`
 * * `PRIORITY_SPEAKER`
 * * `STREAM`
 * * `VIEW_CHANNEL`
 * * `SEND_MESSAGES`
 * * `SEND_TTS_MESSAGES`
 * * `MANAGE_MESSAGES` (delete messages and reactions)
 * * `EMBED_LINKS` (links posted will have a preview embedded)
 * * `ATTACH_FILES`
 * * `READ_MESSAGE_HISTORY` (view messages that were posted prior to opening Discord)
 * * `MENTION_EVERYONE`
 * * `USE_EXTERNAL_EMOJIS` (use emojis from different guilds)
 * * `VIEW_GUILD_INSIGHTS`
 * * `CONNECT` (connect to a voice channel)
 * * `SPEAK` (speak in a voice channel)
 * * `MUTE_MEMBERS` (mute members across all voice channels)
 * * `DEAFEN_MEMBERS` (deafen members across all voice channels)
 * * `MOVE_MEMBERS` (move members between voice channels)
 * * `USE_VAD` (use voice activity detection)
 * * `CHANGE_NICKNAME`
 * * `MANAGE_NICKNAMES` (change other members' nicknames)
 * * `MANAGE_ROLES`
 * * `MANAGE_WEBHOOKS`
 * * `MANAGE_EMOJIS`
 * @type {Object}
 * @see {@link https://discord.com/developers/docs/topics/permissions}
 */
Permissions.FLAGS = {
  CREATE_INSTANT_INVITE: 1 << 0,
  KICK_MEMBERS: 1 << 1,
  BAN_MEMBERS: 1 << 2,
  ADMINISTRATOR: 1 << 3,
  MANAGE_CHANNELS: 1 << 4,
  MANAGE_GUILD: 1 << 5,
  ADD_REACTIONS: 1 << 6,
  VIEW_AUDIT_LOG: 1 << 7,
  PRIORITY_SPEAKER: 1 << 8,
  STREAM: 1 << 9,
  VIEW_CHANNEL: 1 << 10,
  SEND_MESSAGES: 1 << 11,
  SEND_TTS_MESSAGES: 1 << 12,
  MANAGE_MESSAGES: 1 << 13,
  EMBED_LINKS: 1 << 14,
  ATTACH_FILES: 1 << 15,
  READ_MESSAGE_HISTORY: 1 << 16,
  MENTION_EVERYONE: 1 << 17,
  USE_EXTERNAL_EMOJIS: 1 << 18,
  VIEW_GUILD_INSIGHTS: 1 << 19,
  CONNECT: 1 << 20,
  SPEAK: 1 << 21,
  MUTE_MEMBERS: 1 << 22,
  DEAFEN_MEMBERS: 1 << 23,
  MOVE_MEMBERS: 1 << 24,
  USE_VAD: 1 << 25,
  CHANGE_NICKNAME: 1 << 26,
  MANAGE_NICKNAMES: 1 << 27,
  MANAGE_ROLES: 1 << 28,
  MANAGE_WEBHOOKS: 1 << 29,
  MANAGE_EMOJIS: 1 << 30,
};

/**
 * Bitfield representing every permission combined
 * @type {number}
 */
Permissions.ALL = Object.values(Permissions.FLAGS).reduce((all, p) => all | p, 0);

/**
 * Bitfield representing the default permissions for users
 * @type {number}
 */
Permissions.DEFAULT = 104324673;

module.exports = Permissions;