package de.waypointaudio.ui

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Edit
import androidx.compose.material.icons.filled.Explore
import androidx.compose.material3.Icon
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.unit.dp
import de.waypointaudio.R
import androidx.compose.foundation.clickable

/**
 * Modi des vereinten Kartenmoduls (v2.2.1).
 *
 *  EXPLORER — Live-Standort + read-only Wegpunkte (kein PTT, kein Atmo).
 *  EDITOR   — Bestehender Karteneditor (Long-Press neue Wegpunkte, Track-Aufzeichnung).
 *
 * ROUTE/IMPORT sind v2.2.1 noch nicht eigenständige Modi — Import/Drafts laufen
 * weiterhin über das Overflow-Menü bzw. den Karteneditor.
 */
enum class MapMode { EXPLORER, EDITOR }

/**
 * Kompakte Segmented-Control für die TopAppBar.
 * Wird im Title-Slot der jeweiligen Map/Explorer-TopAppBar gerendert, damit die
 * gemeinsame Visualisierung „eine Karte mit Modusumschalter" entsteht.
 */
@Composable
fun MapModeSegmentedHeader(
    current: MapMode,
    onChange: (MapMode) -> Unit,
    subtitle: String? = null,
    modifier: Modifier = Modifier,
    contentColor: androidx.compose.ui.graphics.Color? = null
) {
    val on = contentColor ?: MaterialTheme.colorScheme.onPrimary
    val container = on.copy(alpha = 0.14f)
    val selectedContainer = on.copy(alpha = 0.28f)

    androidx.compose.foundation.layout.Column(modifier = modifier) {
        Surface(
            shape = RoundedCornerShape(20.dp),
            color = container
        ) {
            Row(
                modifier = Modifier.padding(horizontal = 4.dp, vertical = 3.dp),
                verticalAlignment = Alignment.CenterVertically,
                horizontalArrangement = Arrangement.spacedBy(2.dp)
            ) {
                Segment(
                    label = stringResource(R.string.map_mode_explorer),
                    icon = Icons.Filled.Explore,
                    selected = current == MapMode.EXPLORER,
                    selectedColor = selectedContainer,
                    contentColor = on,
                    onClick = { if (current != MapMode.EXPLORER) onChange(MapMode.EXPLORER) }
                )
                Segment(
                    label = stringResource(R.string.map_mode_editor),
                    icon = Icons.Filled.Edit,
                    selected = current == MapMode.EDITOR,
                    selectedColor = selectedContainer,
                    contentColor = on,
                    onClick = { if (current != MapMode.EDITOR) onChange(MapMode.EDITOR) }
                )
            }
        }
        if (subtitle != null) {
            Spacer(Modifier.height(1.dp))
            Text(
                text = subtitle,
                style = MaterialTheme.typography.labelSmall,
                color = on.copy(alpha = 0.8f)
            )
        }
    }
}

@Composable
private fun Segment(
    label: String,
    icon: androidx.compose.ui.graphics.vector.ImageVector,
    selected: Boolean,
    selectedColor: androidx.compose.ui.graphics.Color,
    contentColor: androidx.compose.ui.graphics.Color,
    onClick: () -> Unit
) {
    Surface(
        shape = RoundedCornerShape(16.dp),
        color = if (selected) selectedColor else androidx.compose.ui.graphics.Color.Transparent,
        modifier = Modifier
            .clip(RoundedCornerShape(16.dp))
            .clickable(onClick = onClick)
    ) {
        Row(
            modifier = Modifier.padding(horizontal = 10.dp, vertical = 5.dp),
            verticalAlignment = Alignment.CenterVertically
        ) {
            Icon(
                icon,
                contentDescription = null,
                modifier = Modifier.size(16.dp),
                tint = contentColor
            )
            Spacer(Modifier.width(4.dp))
            Text(
                text = label,
                style = MaterialTheme.typography.labelLarge,
                color = contentColor
            )
        }
    }
}