'use strict';

const process = require('node:process');
const { Collection } = require('@discordjs/collection');
const CachedManager = require('./CachedManager');
const { TypeError } = require('../errors');
const PermissionOverwrites = require('../structures/PermissionOverwrites');
const { Role } = require('../structures/Role');
const { OverwriteTypes } = require('../util/Constants');

let cacheWarningEmitted = false;

/**
 * Manages API methods for guild channel permission overwrites and stores their cache.
 * @extends {CachedManager}
 */
class PermissionOverwriteManager extends CachedManager {
  constructor(channel, iterable) {
    super(channel.client, PermissionOverwrites);
    if (!cacheWarningEmitted && this._cache.constructor.name !== 'Collection') {
      cacheWarningEmitted = true;
      process.emitWarning(
        `Overriding the cache handling for ${this.constructor.name} is unsupported and breaks functionality.`,
        'UnsupportedCacheOverwriteWarning',
      );
    }

    /**
     * The channel of the permission overwrite this manager belongs to
     * @type {GuildChannel}
     */
    this.channel = channel;

    if (iterable) {
      for (const item of iterable) {
        this._add(item);
      }
    }
  }

  /**
   * The cache of this Manager
   * @type {Collection<Snowflake, PermissionOverwrites>}
   * @name PermissionOverwriteManager#cache
   */

  _add(data, cache) {
    return super._add(data, cache, { extras: [this.channel] });
  }

  /**
   * Replaces the permission overwrites in this channel.
   * @param {OverwriteResolvable[]|Collection<Snowflake, OverwriteResolvable>} overwrites
   * Permission overwrites the channel gets updated with
   * @param {string} [reason] Reason for updating the channel overwrites
   * @returns {Promise<GuildChannel>}
   * @example
   * message.channel.permissionOverwrites.set([
   *   {
   *      id: message.author.id,
   *      deny: [Permissions.FLAGS.VIEW_CHANNEL],
   *   },
   * ], 'Needed to change permissions');
   */
  set(overwrites, reason) {
    if (!Array.isArray(overwrites) && !(overwrites instanceof Collection)) {
      return Promise.reject(
        new TypeError('INVALID_TYPE', 'overwrites', 'Array or Collection of Permission Overwrites', true),
      );
    }
    return this.channel.edit({ permissionOverwrites: overwrites, reason });
  }

  /**
   * Extra information about the overwrite
   * @typedef {Object} GuildChannelOverwriteOptions
   * @property {string} [reason] Reason for creating/editing this overwrite
   * @property {number} [type] The type of overwrite, either `0` for a role or `1` for a member. Use this to bypass
   * automatic resolution of type that results in an error for uncached structure
   */

  /**
   * Creates or edits permission overwrites for a user or role in this channel.
   * @param {RoleResolvable|UserResolvable} userOrRole The user or role to update
   * @param {PermissionOverwriteOptions} options The options for the update
   * @param {GuildChannelOverwriteOptions} [overwriteOptions] The extra information for the update
   * @param {PermissionOverwrites} [existing] The existing overwrites to merge with this update
   * @returns {Promise<GuildChannel>}
   * @private
   */
  async upsert(userOrRole, options, overwriteOptions = {}, existing) {
    let userOrRoleId = this.channel.guild.roles.resolveId(userOrRole) ?? this.client.users.resolveId(userOrRole);
    let { type, reason } = overwriteOptions;
    if (typeof type !== 'number') {
      userOrRole = this.channel.guild.roles.resolve(userOrRole) ?? this.client.users.resolve(userOrRole);
      if (!userOrRole) throw new TypeError('INVALID_TYPE', 'parameter', 'User nor a Role');
      type = userOrRole instanceof Role ? OverwriteTypes.role : OverwriteTypes.member;
    }

    const { allow, deny } = PermissionOverwrites.resolveOverwriteOptions(options, existing);

    await this.client.api
      .channels(this.channel.id)
      .permissions(userOrRoleId)
      .put({
        data: { id: userOrRoleId, type, allow, deny },
        reason,
      });
    return this.channel;
  }

  /**
   * Creates permission overwrites for a user or role in this channel, or replaces them if already present.
   * @param {RoleResolvable|UserResolvable} userOrRole The user or role to update
   * @param {PermissionOverwriteOptions} options The options for the update
   * @param {GuildChannelOverwriteOptions} [overwriteOptions] The extra information for the update
   * @returns {Promise<GuildChannel>}
   * @example
   * // Create or Replace permission overwrites for a message author
   * message.channel.permissionOverwrites.create(message.author, {
   *   SEND_MESSAGES: false
   * })
   *   .then(channel => console.log(channel.permissionOverwrites.cache.get(message.author.id)))
   *   .catch(console.error);
   */
  create(userOrRole, options, overwriteOptions) {
    return this.upsert(userOrRole, options, overwriteOptions);
  }

  /**
   * Edits permission overwrites for a user or role in this channel, or creates an entry if not already present.
   * @param {RoleResolvable|UserResolvable} userOrRole The user or role to update
   * @param {PermissionOverwriteOptions} options The options for the update
   * @param {GuildChannelOverwriteOptions} [overwriteOptions] The extra information for the update
   * @returns {Promise<GuildChannel>}
   * @example
   * // Edit or Create permission overwrites for a message author
   * message.channel.permissionOverwrites.edit(message.author, {
   *   SEND_MESSAGES: false
   * })
   *   .then(channel => console.log(channel.permissionOverwrites.cache.get(message.author.id)))
   *   .catch(console.error);
   */
  edit(userOrRole, options, overwriteOptions) {
    userOrRole = this.channel.guild.roles.resolveId(userOrRole) ?? this.client.users.resolveId(userOrRole);
    const existing = this.cache.get(userOrRole);
    return this.upsert(userOrRole, options, overwriteOptions, existing);
  }

  /**
   * Deletes permission overwrites for a user or role in this channel.
   * @param {UserResolvable|RoleResolvable} userOrRole The user or role to delete
   * @param {string} [reason] The reason for deleting the overwrite
   * @returns {Promise<GuildChannel>}
   */
  async delete(userOrRole, reason) {
    const userOrRoleId = this.channel.guild.roles.resolveId(userOrRole) ?? this.client.users.resolveId(userOrRole);
    if (!userOrRoleId) throw new TypeError('INVALID_TYPE', 'parameter', 'User nor a Role');

    await this.client.api.channels(this.channel.id).permissions(userOrRoleId).delete({ reason });
    return this.channel;
  }
}

module.exports = PermissionOverwriteManager;