/*
 * Created by sweetbread
 * Copyright (c) 2025. All rights reserved.
 */

package ru.risdeveau.geotracker

import android.Manifest
import android.content.Context
import android.content.pm.PackageManager
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.rememberLauncherForActivityResult
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.activity.result.contract.ActivityResultContracts
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.outlined.Done
import androidx.compose.material3.Button
import androidx.compose.material3.CircularProgressIndicator
import androidx.compose.material3.Icon
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.OutlinedTextField
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
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.platform.LocalContext
import androidx.compose.ui.text.TextStyle
import androidx.core.content.ContextCompat
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch
import ru.risdeveau.geotracker.ui.theme.GeoTrackerTheme
import splitties.experimental.ExperimentalSplittiesApi
import splitties.init.appCtx
import splitties.resources.appStr

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContent {
            GeoTrackerTheme {
                Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding ->
                    Box(
                        Modifier
                            .padding(innerPadding)
                            .fillMaxSize()) {
                        var screen by remember { mutableStateOf<Screen>(Screen.Loading) }

                        when (screen) {
                            Screen.Main -> {
                                Text("Hello world")
                            }

                            Screen.Settings -> {
                                Settings(Modifier.align(Alignment.Center)) {
                                    screen = Screen.Main
                                }
                            }

                            Screen.Loading -> {
                                var loading by remember { mutableStateOf(true) }

                                if (loading) {
                                    CircularProgressIndicator(Modifier.align(Alignment.Center))
                                    LaunchedEffect(true) {
                                        launch {
                                            screen = if (health(SettingsPreferences.url))
                                                Screen.Main
                                            else
                                                Screen.Settings
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}

sealed class Screen {
    object Main : Screen()
    object Settings : Screen()
    object Loading : Screen()
}

@OptIn(ExperimentalSplittiesApi::class)
@Composable
fun Settings(modifier: Modifier = Modifier, onConfirm: () -> Unit) {
    var username by remember { mutableStateOf("") }
    var url by remember { mutableStateOf("") }
    var urlIsValid by remember { mutableStateOf(false) }
    var loading by remember { mutableStateOf(false) }

    LaunchedEffect(url) {
        if (url.isNotEmpty()) {
            delay(1000)
            loading = true
            urlIsValid = health(url)
            loading = false
        }
    }

    Column (modifier = modifier, horizontalAlignment = Alignment.CenterHorizontally) {
        OutlinedTextField(
            value = username,
            onValueChange = { username = it },
            label = { Text(appStr(R.string.username)) }
        )

        OutlinedTextField(
            value = url,
            onValueChange = { url = it },
            placeholder = {
                Text("https://geo.example.com",
                    style = TextStyle(color = MaterialTheme.colorScheme.onSurfaceVariant)
                )
            },
            label = { Text(appStr(R.string.server_url)) },
            trailingIcon = {
                if (loading) CircularProgressIndicator()
                else if (urlIsValid) Icon(Icons.Outlined.Done, "Done")
            }
        )

        LocationPermissionScreen()

        Button({
            SettingsPreferences.username = username.trim()
            SettingsPreferences.url = url
            onConfirm()
        }, enabled = urlIsValid
                && !loading
                && username.trim().isNotEmpty()
                && hasLocationPermissions(appCtx)
        ) {
            Text(appStr(R.string.apply))
        }
    }
}

@Composable
fun LocationPermissionScreen() {
    val context = LocalContext.current
    val locationPermissions = arrayOf(
        Manifest.permission.ACCESS_FINE_LOCATION
    )

    val hasLocationPermissions = remember {
        mutableStateOf(
            locationPermissions.all {
                ContextCompat.checkSelfPermission(context, it) == PackageManager.PERMISSION_GRANTED
            }
        )
    }

    val permissionLauncher = rememberLauncherForActivityResult(
        contract = ActivityResultContracts.RequestMultiplePermissions()
    ) { permissions ->
        hasLocationPermissions.value = permissions.all { it.value }
    }

    if (hasLocationPermissions.value) {
        Button({}, enabled = false) {
            Icon(Icons.Outlined.Done, "Done")
            Text("Разрешения получены")
        }
    } else {
        Button(onClick = {
            permissionLauncher.launch(locationPermissions)
        }) {
            Text("Получить разрешения")
        }
    }
}

fun hasLocationPermissions(context: Context): Boolean {
    return ContextCompat.checkSelfPermission(
        context,
        Manifest.permission.ACCESS_FINE_LOCATION
    ) == PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(
        context,
        Manifest.permission.ACCESS_COARSE_LOCATION
    ) == PackageManager.PERMISSION_GRANTED
}