package com.aerotoss.ui.screens

import androidx.compose.foundation.layout.*
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.automirrored.filled.ArrowBack
import androidx.compose.material3.*
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import com.aerotoss.core.AeroTossManager
import com.aerotoss.model.TransferState
import com.aerotoss.ui.components.TransferProgressBar

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun ReceiveScreen(
    manager: AeroTossManager,
    onBack: () -> Unit
) {
    val incomingTransfer by manager.incomingTransfers.collectAsState(initial = null)

    Scaffold(
        topBar = {
            TopAppBar(
                title = { Text("Получение файла") },
                navigationIcon = {
                    IconButton(onClick = onBack) {
                        Icon(Icons.AutoMirrored.Filled.ArrowBack, contentDescription = "Назад")
                    }
                }
            )
        }
    ) { padding ->
        Column(
            modifier = Modifier
                .fillMaxSize()
                .padding(padding)
                .padding(16.dp),
            horizontalAlignment = Alignment.CenterHorizontally,
            verticalArrangement = Arrangement.Center
        ) {
            if (incomingTransfer == null) {
                Text(
                    "Ожидание входящих файлов...",
                    style = MaterialTheme.typography.bodyLarge
                )
                Spacer(modifier = Modifier.height(16.dp))
                CircularProgressIndicator()
                Spacer(modifier = Modifier.height(8.dp))
                Text(
                    "Убедитесь, что другое устройство\nотправляет файл на это устройство",
                    style = MaterialTheme.typography.bodySmall,
                    color = MaterialTheme.colorScheme.onSurfaceVariant
                )
            } else {
                val transfer = incomingTransfer!!
                TransferProgressBar(transfer)

                Spacer(modifier = Modifier.height(16.dp))

                when (transfer.state) {
                    TransferState.COMPLETED -> {
                        Text(
                            "Файл получен!",
                            style = MaterialTheme.typography.bodyLarge,
                            color = MaterialTheme.colorScheme.primary
                        )
                    }
                    TransferState.FAILED -> {
                        Text(
                            "Ошибка: ${transfer.error}",
                            style = MaterialTheme.typography.bodyLarge,
                            color = MaterialTheme.colorScheme.error
                        )
                    }
                    TransferState.CANCELLED -> {
                        Text(
                            "Передача отменена",
                            style = MaterialTheme.typography.bodyLarge,
                            color = MaterialTheme.colorScheme.onSurfaceVariant
                        )
                    }
                    else -> { }
                }
            }
        }
    }
}