// 头像逻辑：每个用户每天随机一次；支持自定义（自定义优先，长期保存）
import { api } from '../api/index.js'

function todayStr() {
  const d = new Date()
  return `${d.getFullYear()}-${d.getMonth() + 1}-${d.getDate()}`
}
const customKey = (uid) => `xpx_avatar_custom_${uid}`
const dailyKey = (uid) => `xpx_avatar_daily_${uid}`

export function getCustomAvatar(uid) {
  try {
    return localStorage.getItem(customKey(uid)) || ''
  } catch (e) {
    return ''
  }
}

export function setCustomAvatar(uid, url) {
  try {
    if (url) localStorage.setItem(customKey(uid), url)
    else localStorage.removeItem(customKey(uid))
  } catch (e) {
    /* ignore */
  }
}

// 立即拉取一张随机头像并写入“当日缓存”
export async function refreshDailyAvatar(uid) {
  const data = await api.getRandomAvatar()
  const url = data && data.url
  if (url) {
    try {
      localStorage.setItem(dailyKey(uid), JSON.stringify({ date: todayStr(), url }))
    } catch (e) {
      /* ignore */
    }
  }
  return url || ''
}

// 解析当前应展示的头像：自定义优先；否则用当日缓存；当日无缓存则随机一次
export async function resolveDailyAvatar(uid) {
  const custom = getCustomAvatar(uid)
  if (custom) return custom
  try {
    const raw = localStorage.getItem(dailyKey(uid))
    if (raw) {
      const obj = JSON.parse(raw)
      if (obj && obj.date === todayStr() && obj.url) return obj.url
    }
  } catch (e) {
    /* ignore */
  }
  return await refreshDailyAvatar(uid)
}