package com.bitcointxoko.gudariwallet.ui

import androidx.activity.compose.rememberLauncherForActivityResult
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import com.journeyapps.barcodescanner.ScanContract
import com.journeyapps.barcodescanner.ScanOptions

/**
 * Launches the zxing-android-embedded scanner activity and calls [onScanned]
 * with the raw result string, or [onDismiss] if the user cancels.
 *
 * Camera permission is handled internally by the scanner activity — no
 * Accompanist boilerplate needed here.
 */
@Composable
fun QrScannerScreen(
    onScanned: (String) -> Unit,
    onDismiss: () -> Unit
) {
    val launcher = rememberLauncherForActivityResult(ScanContract()) { result ->
        val content = result.contents
        if (content != null) {
            onScanned(content)
        } else {
            onDismiss()
        }
    }

    // Launch the scanner as soon as this composable enters the composition.
    // The scanner activity takes over the screen; when it finishes the result
    // callback above fires and we navigate away.
    LaunchedEffect(Unit) {
        val options = ScanOptions().apply {
            setDesiredBarcodeFormats(ScanOptions.QR_CODE)
            setPrompt("")           // no bottom prompt text
            setBeepEnabled(false)   // wallet apps are usually silent
            setOrientationLocked(true)
        }
        launcher.launch(options)
    }
}