package com.example.snapandsolve

import android.app.Application
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.heightIn
import androidx.compose.foundation.layout.offset
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.shape.CornerSize
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Add
import androidx.compose.material.icons.filled.Menu
import androidx.compose.material3.BottomAppBar
import androidx.compose.material3.Button
import androidx.compose.material3.ButtonColors
import androidx.compose.material3.ButtonDefaults
import androidx.compose.material3.Card
import androidx.compose.material3.CardColors
import androidx.compose.material3.CardDefaults
import androidx.compose.material3.CenterAlignedTopAppBar
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.FabPosition
import androidx.compose.material3.FloatingActionButton
import androidx.compose.material3.FloatingActionButtonDefaults
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.LargeFloatingActionButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.MediumTopAppBar
import androidx.compose.material3.OutlinedButton
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.material3.TopAppBarColors
import androidx.compose.material3.TopAppBarDefaults
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp
import com.example.snapandsolve.ui.theme.AppColor
import com.example.snapandsolve.ui.theme.ButtonColor
import com.example.snapandsolve.ui.theme.WidgetColor


@Composable
fun MainScreen(modifier: Modifier = Modifier, application: Application) {
    var showReport by rememberSaveable { mutableStateOf(false) }

    Scaffold(
        modifier = Modifier.fillMaxSize(),
        topBar = {
            AppTopBar()
        },
        bottomBar = {
            BottomAppBar(
                modifier = Modifier.height(120.dp),
                containerColor = AppColor,
                // contentColor = AppColor
            ) {
                Row(
                    modifier = Modifier
                        .fillMaxWidth()
                        .padding(start = 16.dp),
                    verticalAlignment = Alignment.CenterVertically
                ) {
                    IconButton(
                        onClick = {
                            /*TODO*/
                        },
                        modifier = Modifier.padding(bottom = 8.dp) // Abstand "in" der Bar
                    ) {
                        Icon(
                            Icons.Default.Menu,
                            contentDescription = "Menu",

                        )
                    }
                    Spacer(Modifier.weight(1f))
                }
            }
        },
        floatingActionButton = {
            LargeFloatingActionButton(
                onClick = {
                    showReport = true
                },
                modifier = Modifier.offset(y = 64.dp),
                containerColor = ButtonColor
            ) {
                Icon(Icons.Default.Add, contentDescription = "Add")
            }
        },
        floatingActionButtonPosition = FabPosition.Center,
    ) {
        innerPadding ->
        ContentScreen(
            modifier = Modifier.padding(innerPadding),
            application,
            showReport = showReport,
            onDismissReport = { showReport = false })
    }
}

@Composable
fun ContentScreen(
    modifier: Modifier = Modifier,
    application: Application,
    showReport: Boolean,
    onDismissReport: () -> Unit
) {
    val mapViewModel = remember { MapViewModel(application) }
    Box(modifier = modifier.fillMaxSize()) {

        // 2) Overlay
        if (showReport) {
            ReportOverlay(
                onCancel = onDismissReport,
                onAdd = { /* später */ }
            )
        }
    }
}

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun AppTopBar(
    modifier: Modifier = Modifier
) {
    MediumTopAppBar(
        title = {
            Text("Scan And Solve")
        },
        colors = TopAppBarDefaults.mediumTopAppBarColors(
            containerColor = AppColor,
            titleContentColor = Color.White
        )

    )
}

@Composable
fun ReportOverlay(
    onCancel: () -> Unit,
    onAdd: () -> Unit
) {
    // leichter Dim-Hintergrund
    Box(
        modifier = Modifier
            .fillMaxSize()
            .background(Color.Black.copy(alpha = 0.25f)),
        contentAlignment = Alignment.Center
    ) {
        Card(
            modifier = Modifier
                .fillMaxWidth(0.9f)
                .heightIn(min = 400.dp),
            shape = RoundedCornerShape(24.dp),
            colors = CardColors(
                containerColor = WidgetColor,
                contentColor = ButtonColor,
                disabledContainerColor = Color.White,
                disabledContentColor = Color.White
            )
        ) {
            Column(
                modifier = Modifier
                    .fillMaxWidth()
                    .padding(20.dp),
                verticalArrangement = Arrangement.spacedBy(16.dp)
            ) {
                Text("Schadensbeschreibung:",
                    color = Color.Black
                )

                // Platzhalter fürs Textfeld / Icons etc.
                Box(
                    modifier = Modifier
                        .fillMaxWidth()
                        .height(220.dp)
                        .background(Color.White, RoundedCornerShape(12.dp))
                )

                Row(
                    modifier = Modifier.fillMaxWidth(),
                    horizontalArrangement = Arrangement.SpaceBetween
                ) {
                    OutlinedButton(
                        onClick = onCancel,
                        colors = ButtonColors(
                            containerColor = ButtonColor,
                            contentColor = Color.White,
                            disabledContainerColor = Color.White,
                            disabledContentColor = Color.White
                        )
                    ) { Text(
                        "Abbrechen",
                        color = Color.Black
                    ) }
                    Button(onClick = onAdd) { Text("Hinzufügen") }
                }
            }
        }
    }
}