package com.example.medilightv2android

import android.content.Context
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.setValue
import com.example.medilightv2android.ble.BleManager
import com.example.medilightv2android.managers.NirsManager
import com.example.medilightv2android.models.*
import com.example.medilightv2android.services.*

enum class AppScreen {
    ONBOARDING, CONSENT, REGISTRATION, HOME, SENSOR_SELECT, DEVICE_SCAN,
    NIRS_CALIBRATION, PIEZO_PERSONALIZATION, PLACEMENT_GUIDE, PIN_SETUP, PIN_ENTRY,
    VIVAMYO_MONITORING, PIEZO_MONITORING, MEASUREMENT_HISTORY,
    VOIDING_DIARY, URINE_CAMERA, REMINDER_SETTINGS
}

class AppState(private val context: Context) {
    var currentScreen by mutableStateOf(AppScreen.ONBOARDING)
    var user by mutableStateOf(User())
    var sensorMode by mutableStateOf(SensorMode.PIEZO)
    var bladderLevel by mutableStateOf(BladderLevel())
    var isDeviceConnected by mutableStateOf(false)
    var isDemoMode by mutableStateOf(false)
    var piezoSettings by mutableStateOf(PiezoSettings())
    var catheterCount = mutableIntStateOf(0)

    private val storage = UserStorage.getInstance(context)
    private val historyStore = MeasurementHistoryStore.getInstance(context)
    private val notificationService = NotificationService.getInstance(context)
    private val bleManager = BleManager.getInstance(context)
    private val reminderService = ReminderService.getInstance(context)

    init {
        loadState()
    }

    fun loadState() {
        user = storage.user
        sensorMode = storage.sensorMode
        bladderLevel = bladderLevel.copy(
            currentLevel = storage.bladderLevel,
            catheterizationThreshold = storage.catheterizationLevel
        )
        piezoSettings = storage.piezoSettings
        catheterCount.intValue = storage.catheterCount

        currentScreen = when {
            !storage.hasCompletedOnboarding -> AppScreen.ONBOARDING
            !storage.isRegistered -> AppScreen.REGISTRATION
            !storage.hasPin -> AppScreen.PIN_SETUP
            else -> AppScreen.PIN_ENTRY
        }
    }

    fun completeOnboarding() {
        storage.hasCompletedOnboarding = true
        storage.hasConsented = true
        currentScreen = AppScreen.REGISTRATION
    }

    fun completeConsent() {
        storage.hasConsented = true
        storage.consentTimestamp = System.currentTimeMillis()
        currentScreen = AppScreen.REGISTRATION
    }

    fun completeRegistration() {
        storage.user = user
        storage.isRegistered = true
        currentScreen = AppScreen.PIN_SETUP
    }

    fun goHome() {
        NirsManager.instance.stopStreaming()
        NirsManager.instance.reset()
        if (!isDemoMode) bleManager.disconnect()
        isDeviceConnected = false
        isDemoMode = false
        currentScreen = AppScreen.HOME
    }

    fun enterDemoMode() {
        isDemoMode = true
        isDeviceConnected = true
        currentScreen = if (sensorMode == SensorMode.NIRS) {
            AppScreen.VIVAMYO_MONITORING
        } else {
            AppScreen.PIEZO_MONITORING
        }
    }

    fun startFromHome() {
        sensorMode = SensorMode.PIEZO
        storage.sensorMode = SensorMode.PIEZO
        currentScreen = if (isDeviceConnected) AppScreen.PIEZO_MONITORING else AppScreen.DEVICE_SCAN
    }

    fun selectSensor(mode: SensorMode) {
        sensorMode = mode
        storage.sensorMode = mode
        currentScreen = AppScreen.DEVICE_SCAN
    }

    fun backToSensorSelect() {
        currentScreen = AppScreen.HOME
    }

    fun deviceConnected() {
        isDeviceConnected = true
        currentScreen = if (sensorMode == SensorMode.NIRS) {
            AppScreen.NIRS_CALIBRATION
        } else {
            AppScreen.PIEZO_PERSONALIZATION
        }
    }

    fun calibrationComplete() {
        currentScreen = AppScreen.VIVAMYO_MONITORING
    }

    fun personalizationComplete() {
        storage.piezoSettings = piezoSettings
        currentScreen = AppScreen.PLACEMENT_GUIDE
    }

    fun placementComplete() {
        bladderLevel = BladderLevel(currentLevel = 0, catheterizationThreshold = bladderLevel.catheterizationThreshold)
        storage.bladderLevel = 0
        currentScreen = AppScreen.PIEZO_MONITORING
    }

    fun pinSet(pin: String) {
        storage.pin = pin
        storage.hasPin = true
        currentScreen = AppScreen.HOME
    }

    fun pinVerified() {
        currentScreen = AppScreen.HOME
    }

    fun incrementLevel() {
        val previousUrgency = bladderLevel.urgency
        val newLevel = bladderLevel.copy()
        newLevel.increment()
        bladderLevel = newLevel
        storage.bladderLevel = bladderLevel.currentLevel

        val record = MeasurementRecord(
            eventType = MeasurementEventType.MEASUREMENT,
            level = bladderLevel.currentLevel,
            estimatedVolume = estimatedVolume,
            urgencyLevel = bladderLevel.urgency,
            fillPercentage = fillPercentage
        )
        historyStore.addRecord(record)

        val newUrgency = bladderLevel.urgency
        if (newUrgency != previousUrgency) {
            notificationService.sendUrgencyNotification(newUrgency, estimatedVolume)
        }
    }

    fun resetLevel() {
        val record = MeasurementRecord(
            eventType = MeasurementEventType.CATHETERIZATION,
            level = bladderLevel.currentLevel,
            estimatedVolume = estimatedVolume,
            urgencyLevel = bladderLevel.urgency,
            fillPercentage = fillPercentage
        )
        historyStore.addRecord(record)

        val newLevel = bladderLevel.copy()
        newLevel.reset()
        bladderLevel = newLevel
        storage.bladderLevel = 0
        notificationService.cancelAll()
        reminderService.reschedule()

        if (catheterCount.intValue > 0) {
            catheterCount.intValue--
            storage.catheterCount = catheterCount.intValue
        }
    }

    fun showHistory() {
        currentScreen = AppScreen.MEASUREMENT_HISTORY
    }

    fun backToMonitoring() {
        currentScreen = if (sensorMode == SensorMode.NIRS) AppScreen.VIVAMYO_MONITORING else AppScreen.PIEZO_MONITORING
    }

    fun addCatheterCount(amount: Int = 1) {
        catheterCount.intValue += amount
        storage.catheterCount = catheterCount.intValue
    }

    fun updateCatheterizationThreshold(threshold: Int) {
        bladderLevel = bladderLevel.copy(catheterizationThreshold = threshold)
        storage.catheterizationLevel = threshold
    }

    val estimatedVolume: Int
        get() {
            if (BladderLevel.MAX_LEVEL <= 0) return 0
            return (bladderLevel.currentLevel.toDouble() / BladderLevel.MAX_LEVEL * piezoSettings.maxVolume).toInt()
        }

    val fillPercentage: Double
        get() {
            if (BladderLevel.MAX_LEVEL <= 0) return 0.0
            return bladderLevel.currentLevel.toDouble() / BladderLevel.MAX_LEVEL * 100.0
        }
}