package com.example.medilightv2android

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.BackHandler
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.compose.animation.Crossfade
import androidx.compose.animation.core.tween
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Scaffold
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.LocalContext
import app.rive.runtime.kotlin.core.Rive
import com.example.medilightv2android.services.KeychainService
import com.example.medilightv2android.services.NotificationService
import com.example.medilightv2android.ui.theme.Medilightv2androidTheme
import com.example.medilightv2android.ui.views.calibration.CalibrationView
import com.example.medilightv2android.ui.views.connection.DeviceScanView
import com.example.medilightv2android.ui.views.history.MeasurementHistoryView
import com.example.medilightv2android.ui.views.home.HomeView
import com.example.medilightv2android.ui.views.monitoring.PlacementGuideView
import com.example.medilightv2android.ui.views.monitoring.PiezoMonitoringView
import com.example.medilightv2android.ui.views.monitoring.VivamyoMonitoringView
import com.example.medilightv2android.ui.views.monitoring.UrineCameraScreen
import com.example.medilightv2android.ui.views.monitoring.VoidingDiaryView
import com.example.medilightv2android.ui.views.onboarding.OnboardingView
import com.example.medilightv2android.ui.views.personalization.PiezoPersonalizationView
import com.example.medilightv2android.ui.views.pin.PinMode
import com.example.medilightv2android.ui.views.pin.PinView
import com.example.medilightv2android.ui.views.registration.RegistrationView
import com.example.medilightv2android.ui.views.consent.ConsentView
import com.example.medilightv2android.ui.views.reminder.ReminderSettingsView
import com.example.medilightv2android.ui.views.sensorselect.SensorSelectView
import com.example.medilightv2android.ui.views.clinical.ClinicalHomeView
import com.example.medilightv2android.ui.views.clinical.ClinicalLiveView

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        // Initialize services
        Rive.init(this)
        KeychainService.init(this)
        NotificationService.getInstance(this)

        enableEdgeToEdge()
        window.addFlags(android.view.WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
        setContent {
            Medilightv2androidTheme {
                Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding ->
                    MedilightApp(modifier = Modifier.padding(innerPadding))
                }
            }
        }
    }
}

@Composable
fun MedilightApp(modifier: Modifier = Modifier) {
    val context = LocalContext.current
    val appState = remember { AppState(context) }

    // HOME에서 뒤로가기 → 앱 종료 확인
    var showExitDialog by remember { mutableStateOf(false) }
    BackHandler(enabled = appState.currentScreen == AppScreen.HOME) {
        showExitDialog = true
    }
    if (showExitDialog) {
        androidx.compose.material3.AlertDialog(
            onDismissRequest = { showExitDialog = false },
            title = { androidx.compose.material3.Text("Exit App") },
            text = { androidx.compose.material3.Text("Are you sure you want to exit?") },
            confirmButton = {
                androidx.compose.material3.TextButton(onClick = { (context as? android.app.Activity)?.finish() }) {
                    androidx.compose.material3.Text("Exit", color = Color.Red)
                }
            },
            dismissButton = {
                androidx.compose.material3.TextButton(onClick = { showExitDialog = false }) {
                    androidx.compose.material3.Text("Cancel")
                }
            }
        )
    }

    // 다른 화면에서 뒤로가기 =  바로 전 화면
    BackHandler(enabled = appState.currentScreen != AppScreen.HOME
            && appState.currentScreen != AppScreen.PIN_ENTRY) {
        when (appState.currentScreen) {
            // 메인 플로우: Home → DeviceScan → Personalization → Placement → Monitoring
            // DeviceScan Back: 임상 흐름이면 ClinicalHome으로, 아니면 HOME
            AppScreen.DEVICE_SCAN ->
                appState.currentScreen =
                    if (com.example.medilightv2android.services.ClinicalSessionStore.inClinicalFlow)
                        AppScreen.CLINICAL_HOME
                    else AppScreen.HOME
            AppScreen.PIEZO_PERSONALIZATION -> appState.currentScreen = AppScreen.DEVICE_SCAN
            // 임상 모드 측정 중이면 endMeasurement → ClinicalHome 복귀
            AppScreen.PLACEMENT_GUIDE ->
                if (com.example.medilightv2android.services.ClinicalSessionStore.currentSession != null) {
                    com.example.medilightv2android.services.ClinicalSessionStore.endMeasurement(context)
                    appState.currentScreen = AppScreen.CLINICAL_HOME
                } else appState.backFromPlacementGuide()
            AppScreen.PIEZO_MONITORING ->
                if (com.example.medilightv2android.services.ClinicalSessionStore.currentSession != null) {
                    com.example.medilightv2android.services.ClinicalSessionStore.endMeasurement(context)
                    appState.currentScreen = AppScreen.CLINICAL_HOME
                } else appState.currentScreen = AppScreen.PLACEMENT_GUIDE
            AppScreen.CLINICAL_HOME -> {
                com.example.medilightv2android.services.ClinicalSessionStore.inClinicalFlow = false
                appState.currentScreen = AppScreen.HOME
            }
            AppScreen.CLINICAL_LIVE -> {
                // 측정 폴더 finalize 후 ClinicalHome 복귀
                com.example.medilightv2android.services.ClinicalSessionStore.endMeasurement(context)
                appState.currentScreen = AppScreen.CLINICAL_HOME
            }
            // 모니터링 하위 화면 → 모니터링
            AppScreen.MEASUREMENT_HISTORY -> appState.currentScreen = AppScreen.PIEZO_MONITORING
            AppScreen.VOIDING_DIARY -> appState.currentScreen = AppScreen.PIEZO_MONITORING
            AppScreen.REMINDER_SETTINGS -> appState.currentScreen = AppScreen.PIEZO_MONITORING
            AppScreen.URINE_CAMERA -> appState.currentScreen = AppScreen.PIEZO_MONITORING
            // 기타
            AppScreen.SENSOR_SELECT -> appState.currentScreen = AppScreen.HOME
            AppScreen.VIVAMYO_MONITORING -> appState.currentScreen = AppScreen.HOME
            AppScreen.NIRS_CALIBRATION -> appState.currentScreen = AppScreen.DEVICE_SCAN
            // 온보딩/등록 (뒤로가기 막지 않되 Home으로)
            else -> appState.currentScreen = AppScreen.HOME
        }
    }

    Crossfade(
        targetState = appState.currentScreen,
        animationSpec = tween(300),
        modifier = modifier,
        label = "screen"
    ) { screen ->
        when (screen) {
            AppScreen.ONBOARDING -> OnboardingView(appState)
            AppScreen.CONSENT -> ConsentView(appState)
            AppScreen.REGISTRATION -> RegistrationView(appState)
            AppScreen.HOME -> HomeView(appState)
            AppScreen.SENSOR_SELECT -> SensorSelectView(appState)
            AppScreen.DEVICE_SCAN -> DeviceScanView(appState)
            AppScreen.NIRS_CALIBRATION -> CalibrationView(appState)
            AppScreen.PIEZO_PERSONALIZATION -> PiezoPersonalizationView(appState)
            AppScreen.PLACEMENT_GUIDE -> PlacementGuideView(appState)
            AppScreen.PIN_SETUP -> PinView(appState, PinMode.SETUP, context)
            AppScreen.PIN_ENTRY -> PinView(appState, PinMode.ENTER, context)
            AppScreen.VIVAMYO_MONITORING -> VivamyoMonitoringView(appState)
            AppScreen.PIEZO_MONITORING -> PiezoMonitoringView(appState)
            AppScreen.MEASUREMENT_HISTORY -> MeasurementHistoryView(appState)
            AppScreen.VOIDING_DIARY -> VoidingDiaryView(onBack = { appState.currentScreen = AppScreen.HOME })
            AppScreen.URINE_CAMERA -> UrineCameraScreen(
                onDone = { volume ->
                    if (volume != null && volume > 0) appState.resetLevel()
                    appState.currentScreen = AppScreen.PIEZO_MONITORING
                },
                onCancel = { appState.currentScreen = AppScreen.PIEZO_MONITORING }
            )
            AppScreen.REMINDER_SETTINGS -> ReminderSettingsView(
                onBack = { appState.backToMonitoring() }
            )
            AppScreen.CLINICAL_HOME -> ClinicalHomeView(appState)
            AppScreen.CLINICAL_LIVE -> ClinicalLiveView(appState)
        }
    }
}