/*
 * Copyright (c) 2026 Meshtastic LLC
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
package org.meshtastic.core.ui.component

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.size
import androidx.compose.material3.Icon
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.vector.ImageVector
import androidx.compose.ui.unit.dp

/**
 * Generic empty-state placeholder for detail panes in list-detail layouts.
 *
 * Shows a centered icon and title, styled with [MaterialTheme.colorScheme.onSurfaceVariant]. Used by both nodes and
 * conversations adaptive screens on Android and Desktop.
 */
@Composable
fun EmptyDetailPlaceholder(icon: ImageVector, title: String, modifier: Modifier = Modifier) {
    Box(modifier = modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
        Column(horizontalAlignment = Alignment.CenterHorizontally, verticalArrangement = Arrangement.Center) {
            Icon(
                imageVector = icon,
                contentDescription = null,
                modifier = Modifier.size(64.dp),
                tint = MaterialTheme.colorScheme.onSurfaceVariant,
            )
            Spacer(modifier = Modifier.height(16.dp))
            Text(
                text = title,
                style = MaterialTheme.typography.titleLarge,
                color = MaterialTheme.colorScheme.onSurfaceVariant,
            )
        }
    }
}
