'use strict'

const { now } = require('pearcord-shared')

const USER_PREFS_GOSSIP_WINDOW = 4096

const userSettingsMixin = {
  _userPrefsGossipKeys: null,
  _userPrefsHealWatermark: null,

  _userPrefsGossipKey (payload) {
    if (!payload?.userId) return ''
    const at = payload.updatedAt || payload.prefsUpdatedAt || 0
    const keys = payload.patchKeys?.join(',') || Object.keys(payload.prefs || {}).slice(0, 8).join(',')
    return `prefs:${payload.userId}:${at}:${keys}`
  },

  _shouldGossipUserPrefs (payload) {
    const hash = this._userPrefsGossipKey(payload)
    if (!hash) return false
    if (!this._userPrefsGossipKeys) this._userPrefsGossipKeys = new Set()
    if (this._userPrefsGossipKeys.has(hash)) return false
    this._userPrefsGossipKeys.add(hash)
    if (this._userPrefsGossipKeys.size > USER_PREFS_GOSSIP_WINDOW) {
      const first = this._userPrefsGossipKeys.values().next().value
      if (first) this._userPrefsGossipKeys.delete(first)
    }
    return true
  },

  async _healUserPrefsOnPartition (guildId) {
    const span = this.log.time('settings.heal', {
      spanKind: 'settings.heal',
      guildId: guildId || this.guild?.guild?.id || null
    })
    try {
      if (!this.userSettings) {
        span.end({ relisted: 0, skipped: true })
        return { relisted: 0, skipped: true }
      }
      const prefs = await this.userSettings.getPrefs()
      const watermark = Date.now()
      this._userPrefsHealWatermark = watermark
      span.end({
        relisted: Object.keys(prefs || {}).length,
        watermark,
        settingsUserSection: prefs?.settingsUserSection || null
      })
      return { relisted: Object.keys(prefs || {}).length, watermark }
    } catch (err) {
      this.log.error('settings.heal error', { guildId, error: err?.message || String(err) })
      span.fail(err)
      return { relisted: 0, error: err?.message || String(err) }
    }
  },

  async _healProfileCosmeticsOnPartition (guildId) {
    const span = this.log.time('privacy.heal', {
      spanKind: 'privacy.heal',
      guildId: guildId || this.guild?.guild?.id || null
    })
    try {
      if (!this.profileCosmetics) {
        span.end({ relisted: 0, skipped: true })
        return { relisted: 0, skipped: true }
      }
      const row = await this.profileCosmetics.get().catch(() => null)
      span.end({ relisted: row ? 1 : 0, hasBanner: !!row?.bannerColor })
      return { relisted: row ? 1 : 0 }
    } catch (err) {
      this.log.error('privacy.heal error', { guildId, error: err?.message || String(err) })
      span.fail(err)
      return { relisted: 0, error: err?.message || String(err) }
    }
  }
}

module.exports = {
  userSettingsMixin,
  USER_PREFS_GOSSIP_WINDOW
}