package com.example.flashlightpro

import android.hardware.camera2.CameraManager
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.OnBackPressedCallback
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Button
import androidx.compose.material3.Slider
import androidx.compose.material3.Text
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.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import com.example.flashlightpro.controller.FlashlightController
import com.example.flashlightpro.features.StrobeLightFeature

class MainActivity : ComponentActivity() {

    private lateinit var flashlightController: FlashlightController
    private var isBlinking = false

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

        val cameraManager = getSystemService(CAMERA_SERVICE) as CameraManager
        val cameraId = cameraManager.cameraIdList[0]

        val strobeLightFeature = StrobeLightFeature(cameraManager, cameraId)
        flashlightController = FlashlightController(strobeLightFeature)

        onBackPressedDispatcher.addCallback(this, object : OnBackPressedCallback(true) {
            override fun handleOnBackPressed() {
                if (isBlinking) {
                    flashlightController.stopBlinking()
                }
                finish()
            }
        })

        setContent {
            var buttonText by remember { mutableStateOf(stringResource(R.string.start_blinking)) }
            var sliderPosition by remember { mutableStateOf(0.5f) }

            MyComposeUI(
                onBlinkStartStop = {
                    isBlinking = !isBlinking
                    if (isBlinking) {
                        flashlightController.startBlinking(sliderPosition)
                        buttonText = stringResource(R.string.stop_blinking)
                    } else {
                        flashlightController.stopBlinking()
                        buttonText = stringResource(R.string.start_blinking)
                    }
                },
                onSpeedChange = { speed: Float ->
                    sliderPosition = speed
                    if (isBlinking) {
                        flashlightController.startBlinking(speed)
                    }
                },
                buttonText = buttonText,
                sliderPosition = sliderPosition
            )
        }
    }

    @Composable
    fun MyComposeUI(
        onBlinkStartStop: () -> Unit,
        onSpeedChange: (Float) -> Unit,
        buttonText: String,
        sliderPosition: Float
    ) {
        Column(
            modifier = Modifier
                .fillMaxSize()
                .padding(16.dp),
            verticalArrangement = Arrangement.SpaceBetween
        ) {
            Text(
                text = stringResource(R.string.app_name),
                modifier = Modifier.align(Alignment.CenterHorizontally)
            )

            Button(
                onClick = onBlinkStartStop,
                modifier = Modifier.align(Alignment.CenterHorizontally)
            ) {
                Text(text = buttonText)
            }

            Slider(
                value = sliderPosition,
                onValueChange = onSpeedChange,
                modifier = Modifier
                    .fillMaxWidth()
                    .padding(top = 16.dp)
            )
        }
    }

    // This is the preview Composable with no parameters
    @Preview(showBackground = true)
    @Composable
    fun PreviewMyComposeUI() {
        MyComposeUI(
            onBlinkStartStop = {},
            onSpeedChange = {},
            buttonText = stringResource(R.string.start_blinking),
            sliderPosition = 0.5f
        )
    }
}