declare const plus: any

const DEVICE_SN_STORAGE_KEY = 'wallace:screen:sn'
const DEVICE_SN_PREFIX = 'WLS-'

const normalizeNativeId = (value: unknown) => String(value || '')
	.toUpperCase()
	.replace(/[^A-Z0-9]/g, '')
	.slice(0, 32)

const createFallbackId = () => {
	const timestamp = Date.now().toString(36).toUpperCase()
	const random = Math.random().toString(36).slice(2, 12).toUpperCase()
	return `${timestamp}${random}`
}

/**
 * APP 端优先使用 DCloud 提供的设备唯一标识 `plus.device.uuid`。
 * H5、模拟器或标识不可用时，生成应用级标识并持久化，保证同一次安装期间稳定。
 */
const getNativeDeviceId = () => {
	// #ifdef APP-PLUS
	try {
		return normalizeNativeId(plus?.device?.uuid)
	} catch {
		return ''
	}
	// #endif
	return ''
}

export const getOrCreateDeviceSn = () => {
	const saved = String(uni.getStorageSync(DEVICE_SN_STORAGE_KEY) || '')
	if (saved) return saved

	const sourceId = getNativeDeviceId() || createFallbackId()
	const sn = `${DEVICE_SN_PREFIX}${sourceId}`
	uni.setStorageSync(DEVICE_SN_STORAGE_KEY, sn)
	return sn
}