const STORAGE_KEY = 'zy_orders_v1'

function readAll() {
  return uni.getStorageSync(STORAGE_KEY) || []
}

function writeAll(list) {
  uni.setStorageSync(STORAGE_KEY, list)
}

export function listOrders() {
  return readAll().sort((a, b) => (b.createdAt || 0) - (a.createdAt || 0))
}

export function getOrderById(id) {
  return readAll().find((x) => x.id === id) || null
}

export function upsertOrder(order) {
  const list = readAll()
  const idx = list.findIndex((x) => x.id === order.id)
  if (idx >= 0) list[idx] = order
  else list.unshift(order)
  writeAll(list)
  return order
}

export function patchOrder(id, patch) {
  const list = readAll()
  const idx = list.findIndex((x) => x.id === id)
  if (idx < 0) return null
  list[idx] = { ...list[idx], ...patch }
  writeAll(list)
  return list[idx]
}

export function ensureSeedOrders() {
  const list = readAll()
  if (list.length) return
  writeAll([])
}

export function createId(prefix) {
  const s = `${Date.now()}${Math.floor(Math.random() * 1000)}`
  return `${prefix}_${s}`
}