Gas-Tank-AR-App/GasTankAR/Views/TankAR/MeasurementListView.swift

//
//  MeasurementListView.swift
//  GasTankAR
//
//  Created by Dennis Nemec on 28.08.26.
//

import SwiftUI

/// Von unten einschwebendes Sheet mit den angelegten Strecken. Ist keine vorhanden,
/// wird zum Hinzufügen aufgefordert.
struct MeasurementListView: View {
    let controller: ARSessionController
    /// Startet einen neuen Messvorgang (schließt das Sheet und lässt den Nutzer zwei Punkte wählen).
    let onAddStrecke: () -> Void

    var body: some View {
        NavigationStack {
            List {
                Section("Tankmaße") {
                    Toggle("Alle anzeigen", isOn: allDimensionsBinding)

                    ForEach(TankDimension.allCases) { dimension in
                        Toggle(
                            dimension.title,
                            isOn: dimensionBinding(for: dimension)
                        )
                    }
                }

                Section("Eigene Strecken") {
                    if controller.measurements.isEmpty {
                        Text("Noch keine eigenen Strecken angelegt.")
                            .foregroundStyle(.secondary)
                    } else {
                        ForEach(controller.measurements) { measurement in
                            HStack {
                                VStack(alignment: .leading, spacing: 2) {
                                    Text(measurement.name)
                                        .font(.headline)
                                    Text(measurement.formattedDistance)
                                        .font(.subheadline)
                                        .foregroundStyle(.secondary)
                                }
                                Spacer()
                                Image(systemName: "ruler")
                                    .foregroundStyle(.secondary)
                            }
                        }
                        .onDelete { controller.deleteMeasurements(at: $0) }
                    }
                }
            }
            .navigationTitle("Strecken")
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .topBarTrailing) {
                    Button("Hinzufügen", systemImage: "plus", action: onAddStrecke)
                }
            }
        }
        .presentationDetents([.medium, .large])
    }

    private var allDimensionsBinding: Binding<Bool> {
        Binding(
            get: { TankDimension.allCases.allSatisfy { controller.visibleTankDimensions.contains($0) } },
            set: { isVisible in
                for dimension in TankDimension.allCases {
                    controller.setTankDimension(dimension, visible: isVisible)
                }
            }
        )
    }

    private func dimensionBinding(for dimension: TankDimension) -> Binding<Bool> {
        Binding(
            get: { controller.visibleTankDimensions.contains(dimension) },
            set: { controller.setTankDimension(dimension, visible: $0) }
        )
    }
}