export const SCAN_BROADCAST_ACTION = 'android.intent.action.SCANRESULT'
export const SCAN_BROADCAST_EXTRA = 'value'

const DUPLICATE_WINDOW_MS = 80

let receiver = null
let activity = null
let lastScan = { value: '', receivedAt: 0 }

export function normalizeScanValue(value) {
	if (value === null || value === undefined) return ''
	return String(value).trim()
}

export function isDuplicateScan(value, receivedAt = Date.now()) {
	const duplicate = value === lastScan.value && receivedAt - lastScan.receivedAt < DUPLICATE_WINDOW_MS
	if (!duplicate) lastScan = { value, receivedAt }
	return duplicate
}

export function resetScanDeduplication() {
	lastScan = { value: '', receivedAt: 0 }
}

export function startScanBroadcast({ onScan, onError } = {}) {
	if (typeof onScan !== 'function') return () => {}

	// #ifdef APP-PLUS
	try {
		if (receiver) stopScanBroadcast()

		activity = plus.android.runtimeMainActivity()
		const IntentFilter = plus.android.importClass('android.content.IntentFilter')
		const filter = new IntentFilter()
		filter.addAction(SCAN_BROADCAST_ACTION)
		receiver = plus.android.implements('io.dcloud.feature.internal.reflect.BroadcastReceiver', {
			onReceive(context, intent) {
				try {
					plus.android.importClass(intent)
					const value = normalizeScanValue(intent.getStringExtra(SCAN_BROADCAST_EXTRA))
					if (!value || isDuplicateScan(value)) return
					onScan(value)
				} catch (error) {
					if (typeof onError === 'function') onError(error)
				}
			}
		})
		const Build = plus.android.importClass('android.os.Build')
		if (Build.VERSION.SDK_INT >= 33) {
			const Context = plus.android.importClass('android.content.Context')
			activity.registerReceiver(receiver, filter, Context.RECEIVER_EXPORTED)
		} else {
			activity.registerReceiver(receiver, filter)
		}
	} catch (error) {
		receiver = null
		activity = null
		if (typeof onError === 'function') onError(error)
	}
	// #endif

	return stopScanBroadcast
}

export function stopScanBroadcast() {
	// #ifdef APP-PLUS
	if (activity && receiver) {
		try {
			activity.unregisterReceiver(receiver)
		} catch (_) {}
	}
	// #endif
	receiver = null
	activity = null
	resetScanDeduplication()
}