'use strict';

const Base = require('./Base');
const { GuildScheduledEvent } = require('./GuildScheduledEvent');
const IntegrationApplication = require('./IntegrationApplication');
const InviteStageInstance = require('./InviteStageInstance');
const { Error } = require('../errors');
const { Endpoints } = require('../util/Constants');
const Permissions = require('../util/Permissions');

// TODO: Convert `inviter` and `channel` in this class to a getter.

/**
 * Represents an invitation to a guild channel.
 * @extends {Base}
 */
class Invite extends Base {
  constructor(client, data) {
    super(client);
    this._patch(data);
  }

  _patch(data) {
    const InviteGuild = require('./InviteGuild');
    /**
     * The guild the invite is for including welcome screen data if present
     * @type {?(Guild|InviteGuild)}
     */
    this.guild ??= null;
    if (data.guild) {
      this.guild = this.client.guilds.resolve(data.guild.id) ?? new InviteGuild(this.client, data.guild);
    }

    if ('code' in data) {
      /**
       * The code for this invite
       * @type {string}
       */
      this.code = data.code;
    }

    if ('approximate_presence_count' in data) {
      /**
       * The approximate number of online members of the guild this invite is for
       * <info>This is only available when the invite was fetched through {@link Client#fetchInvite}.</info>
       * @type {?number}
       */
      this.presenceCount = data.approximate_presence_count;
    } else {
      this.presenceCount ??= null;
    }

    if ('approximate_member_count' in data) {
      /**
       * The approximate total number of members of the guild this invite is for
       * <info>This is only available when the invite was fetched through {@link Client#fetchInvite}.</info>
       * @type {?number}
       */
      this.memberCount = data.approximate_member_count;
    } else {
      this.memberCount ??= null;
    }

    if ('temporary' in data) {
      /**
       * Whether or not this invite only grants temporary membership
       * <info>This is only available when the invite was fetched through {@link GuildInviteManager#fetch}
       * or created through {@link GuildInviteManager#create}.</info>
       * @type {?boolean}
       */
      this.temporary = data.temporary ?? null;
    } else {
      this.temporary ??= null;
    }

    if ('max_age' in data) {
      /**
       * The maximum age of the invite, in seconds, 0 if never expires
       * <info>This is only available when the invite was fetched through {@link GuildInviteManager#fetch}
       * or created through {@link GuildInviteManager#create}.</info>
       * @type {?number}
       */
      this.maxAge = data.max_age;
    } else {
      this.maxAge ??= null;
    }

    if ('uses' in data) {
      /**
       * How many times this invite has been used
       * <info>This is only available when the invite was fetched through {@link GuildInviteManager#fetch}
       * or created through {@link GuildInviteManager#create}.</info>
       * @type {?number}
       */
      this.uses = data.uses;
    } else {
      this.uses ??= null;
    }

    if ('max_uses' in data) {
      /**
       * The maximum uses of this invite
       * <info>This is only available when the invite was fetched through {@link GuildInviteManager#fetch}
       * or created through {@link GuildInviteManager#create}.</info>
       * @type {?number}
       */
      this.maxUses = data.max_uses;
    } else {
      this.maxUses ??= null;
    }

    if ('inviter_id' in data) {
      /**
       * The user's id who created this invite
       * @type {?Snowflake}
       */
      this.inviterId = data.inviter_id;
      this.inviter = this.client.users.resolve(data.inviter_id);
    } else {
      this.inviterId ??= null;
    }

    if ('inviter' in data) {
      /**
       * The user who created this invite
       * @type {?User}
       */
      this.inviter ??= this.client.users._add(data.inviter);
      this.inviterId = data.inviter.id;
    } else {
      this.inviter ??= null;
    }

    if ('target_user' in data) {
      /**
       * The user whose stream to display for this voice channel stream invite
       * @type {?User}
       */
      this.targetUser = this.client.users._add(data.target_user);
    } else {
      this.targetUser ??= null;
    }

    if ('target_application' in data) {
      /**
       * The embedded application to open for this voice channel embedded application invite
       * @type {?IntegrationApplication}
       */
      this.targetApplication = new IntegrationApplication(this.client, data.target_application);
    } else {
      this.targetApplication ??= null;
    }

    /**
     * The type of the invite target:
     * * 1: STREAM
     * * 2: EMBEDDED_APPLICATION
     * @typedef {number} TargetType
     * @see {@link https://discord.com/developers/docs/resources/invite#invite-object-invite-target-types}
     */

    if ('target_type' in data) {
      /**
       * The target type
       * @type {?TargetType}
       */
      this.targetType = data.target_type;
    } else {
      this.targetType ??= null;
    }

    if ('channel_id' in data) {
      /**
       * The channel's id this invite is for
       * @type {Snowflake}
       */
      this.channelId = data.channel_id;
      this.channel = this.client.channels.cache.get(data.channel_id);
    }

    if ('channel' in data) {
      /**
       * The channel this invite is for
       * @type {Channel}
       */
      this.channel ??= this.client.channels._add(data.channel, this.guild, { cache: false });
      this.channelId ??= data.channel.id;
    }

    if ('created_at' in data) {
      /**
       * The timestamp this invite was created at
       * @type {?number}
       */
      this.createdTimestamp = new Date(data.created_at).getTime();
    } else {
      this.createdTimestamp ??= null;
    }

    if ('expires_at' in data) this._expiresTimestamp = new Date(data.expires_at).getTime();
    else this._expiresTimestamp ??= null;

    if ('stage_instance' in data) {
      /**
       * The stage instance data if there is a public {@link StageInstance} in the stage channel this invite is for
       * @type {?InviteStageInstance}
       */
      this.stageInstance = new InviteStageInstance(this.client, data.stage_instance, this.channel.id, this.guild.id);
    } else {
      this.stageInstance ??= null;
    }

    if ('guild_scheduled_event' in data) {
      /**
       * The guild scheduled event data if there is a {@link GuildScheduledEvent} in the channel this invite is for
       * @type {?GuildScheduledEvent}
       */
      this.guildScheduledEvent = new GuildScheduledEvent(this.client, data.guild_scheduled_event);
    } else {
      this.guildScheduledEvent ??= null;
    }
  }

  /**
   * The time the invite was created at
   * @type {?Date}
   * @readonly
   */
  get createdAt() {
    return this.createdTimestamp ? new Date(this.createdTimestamp) : null;
  }

  /**
   * Whether the invite is deletable by the client user
   * @type {boolean}
   * @readonly
   */
  get deletable() {
    const guild = this.guild;
    if (!guild || !this.client.guilds.cache.has(guild.id)) return false;
    if (!guild.me) throw new Error('GUILD_UNCACHED_ME');
    return (
      this.channel.permissionsFor(this.client.user).has(Permissions.FLAGS.MANAGE_CHANNELS, false) ||
      guild.me.permissions.has(Permissions.FLAGS.MANAGE_GUILD)
    );
  }

  /**
   * The timestamp the invite will expire at
   * @type {?number}
   * @readonly
   */
  get expiresTimestamp() {
    return (
      this._expiresTimestamp ??
      (this.createdTimestamp && this.maxAge ? this.createdTimestamp + this.maxAge * 1_000 : null)
    );
  }

  /**
   * The time the invite will expire at
   * @type {?Date}
   * @readonly
   */
  get expiresAt() {
    const { expiresTimestamp } = this;
    return expiresTimestamp ? new Date(expiresTimestamp) : null;
  }

  /**
   * The URL to the invite
   * @type {string}
   * @readonly
   */
  get url() {
    return Endpoints.invite(this.client.options.http.invite, this.code);
  }

  /**
   * Deletes this invite.
   * @param {string} [reason] Reason for deleting this invite
   * @returns {Promise<Invite>}
   */
  async delete(reason) {
    await this.client.api.invites[this.code].delete({ reason });
    return this;
  }

  /**
   * When concatenated with a string, this automatically concatenates the invite's URL instead of the object.
   * @returns {string}
   * @example
   * // Logs: Invite: https://discord.gg/A1b2C3
   * console.log(`Invite: ${invite}`);
   */
  toString() {
    return this.url;
  }

  toJSON() {
    return super.toJSON({
      url: true,
      expiresTimestamp: true,
      presenceCount: false,
      memberCount: false,
      uses: false,
      channel: 'channelId',
      inviter: 'inviterId',
      guild: 'guildId',
    });
  }

  valueOf() {
    return this.code;
  }

  /**
   * Join this Guild using this invite.
   * @returns {Promise<Invite>}
   * @example
   * await client.fetchInvite('code').then(async invite => {
   *   await invite.acceptInvite();
   * });
   */
  async acceptInvite() {
    return await this.client.api.invite(this.code).post({ versioned: false });
  }

}

/**
 * Regular expression that globally matches Discord invite links
 * @type {RegExp}
 */
Invite.INVITES_PATTERN = /discord(?:(?:app)?\.com\/invite|\.gg(?:\/invite)?)\/([\w-]{2,255})/gi;

module.exports = Invite;