/**
 * 设计清单本地存储 —— R2 后降级为「离线兜底缓存」层（按 openid 隔离，见 keys.ts）。
 * 真实 CRUD 已走 utils/api/design.ts；本层职责：
 * - 页面 API 成功 → 回写缓存，供冷启动先展示与未迁移页面（checkout 等）读取；
 * - API 失败/断网 → 页面读缓存正常浏览；
 * - 联网刷新以服务端为准覆盖缓存，旧本地数据不做自动合并（route-r2 风险节：默认忽略）。
 */
import Taro from '@tarojs/taro'
import type { DesignItem } from '../../types'
import { assetUrl } from '../asset'
import { PRODUCT_ICON_MAP } from '../productConfig'
import { key, keyFor } from './keys'

/** 跨用户读取指定 openid 的设计清单（账号管理用） */
export function getDesignListFor(openid: string): DesignItem[] {
  try { return Taro.getStorageSync(keyFor('design_list', openid)) || [] } catch { return [] }
}

// ---------- 设计清单 ----------

export function getDesignList(): DesignItem[] {
  try { return Taro.getStorageSync(key('design_list')) || [] } catch { return [] }
}

export function setDesignList(list: DesignItem[]) {
  Taro.setStorageSync(key('design_list'), list)
}

export function addDesign(product: any, count: number): DesignItem {
  const list = getDesignList()
  const iconImg = assetUrl(product?.iconImg || PRODUCT_ICON_MAP[product?.id] || '/icon/四角星.svg')
  const item: DesignItem = {
    id: 'DSG' + Date.now(),
    productId: product.id,
    productName: product.name,
    productIcon: iconImg,
    unitPrice: product.price,
    count,
    status: 'undesigned',
    createdAt: new Date().toISOString().slice(0, 10)
  }
  setDesignList([...list, item])
  return item
}

export function updateDesign(id: string, patch: Partial<DesignItem>) {
  const list = getDesignList()
  const idx = list.findIndex(d => d.id === id)
  if (idx === -1) return
  list[idx] = { ...list[idx], ...patch }
  setDesignList(list)
}

/** 批量删除设计条目 */
export function removeDesigns(ids: string[]) {
  const list = getDesignList().filter(d => !ids.includes(d.id))
  setDesignList(list)
}

/** 根据ID删除单条设计 */
export function removeDesign(id: string) {
  const list = getDesignList().filter(d => d.id !== id)
  setDesignList(list)
}