package io.oxygenhub.android.alerts

import android.Manifest

import android.content.pm.PackageManager

import android.os.Build

import androidx.activity.compose.rememberLauncherForActivityResult

import androidx.activity.result.contract.ActivityResultContracts

import androidx.compose.foundation.layout.Arrangement

import androidx.compose.foundation.layout.Column

import androidx.compose.foundation.layout.Row

import androidx.compose.foundation.layout.fillMaxWidth

import androidx.compose.foundation.layout.padding

import androidx.compose.material3.ElevatedCard

import androidx.compose.material3.MaterialTheme

import androidx.compose.material3.Switch

import androidx.compose.material3.Text

import androidx.compose.runtime.Composable

import androidx.compose.runtime.LaunchedEffect

import androidx.compose.runtime.getValue

import androidx.compose.ui.Alignment

import androidx.compose.ui.Modifier

import androidx.compose.ui.platform.LocalContext

import androidx.compose.ui.unit.dp

import androidx.core.content.ContextCompat

import androidx.lifecycle.compose.collectAsStateWithLifecycle

/** On the Account screen: notifications when a proposal can be landed (#20), on or off. */

@Composable

fun LandAlertsCard() {

    val context = LocalContext.current

    val on by LandAlerts.on.collectAsStateWithLifecycle()

    LaunchedEffect(Unit) { LandAlerts.refresh(context) }

    // Without the permission there is nothing to show, so it stays off.

    val ask = rememberLauncherForActivityResult(ActivityResultContracts.RequestPermission()) { granted ->

        if (granted) LandAlerts.enable(context)

    }

    val turnOn = {

        val granted = Build.VERSION.SDK_INT < 33 ||

            ContextCompat.checkSelfPermission(context, Manifest.permission.POST_NOTIFICATIONS) == PackageManager.PERMISSION_GRANTED

        if (granted) LandAlerts.enable(context) else ask.launch(Manifest.permission.POST_NOTIFICATIONS)

    }

    ElevatedCard(Modifier.fillMaxWidth()) {

        Row(Modifier.padding(16.dp), verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(16.dp)) {

            Column(Modifier.weight(1f), verticalArrangement = Arrangement.spacedBy(4.dp)) {

                Text("Ready to land", style = MaterialTheme.typography.titleMedium)

                Text(

                    "Tell me when a proposal I can land has its checks and reviews settled. Checked every 15 minutes.",

                    style = MaterialTheme.typography.bodyMedium,

                    color = MaterialTheme.colorScheme.onSurfaceVariant,

                )

            }

            Switch(

                checked = on == true,

                enabled = on != null,

                onCheckedChange = { if (it) turnOn() else LandAlerts.disable(context) },

            )

        }

    }

}