package com.example.medilightv2android.services

import android.content.Context
import androidx.compose.runtime.mutableStateOf
import com.example.medilightv2android.ble.BleManager
import com.example.medilightv2android.models.SensorMode

class MeasurementService private constructor(context: Context) {
    companion object {
        @Volatile
        private var instance: MeasurementService? = null
        fun getInstance(context: Context): MeasurementService =
            instance ?: synchronized(this) {
                instance ?: MeasurementService(context.applicationContext).also { instance = it }
            }
    }

    private val bleManager = BleManager.getInstance(context)

    val isMeasuring = mutableStateOf(false)

    fun performMeasurement(mode: SensorMode, completion: (Boolean) -> Unit) {
        isMeasuring.value = true
        when (mode) {
            SensorMode.NIRS -> performNirsMeasurement(completion)
            SensorMode.PIEZO -> performPiezoMeasurement(completion)
        }
    }

    private fun performNirsMeasurement(completion: (Boolean) -> Unit) {
        bleManager.onNirsMcjReceived = { _ ->
            isMeasuring.value = false
            completion(true)
        }
        bleManager.sendMcjQuery()
    }

    private fun performPiezoMeasurement(completion: (Boolean) -> Unit) {
        bleManager.onPiezoDataReceived = { _ ->
            isMeasuring.value = false
            completion(true)
        }
        bleManager.sendBurst(freqOption = 2, cycles = 5, delayUs = 100)
    }

    fun stop() {
        isMeasuring.value = false
        bleManager.sendPiezoStop()
    }
}