Gas-Tank-AR-App/GasTankAR/Views/ProjectListView.swift

//
//  ProjectListView.swift
//  GasTankAR
//
//  Created by Dennis Nemec on 25.08.26.
//

import SwiftUI
import SwiftData

struct ProjectListView: View {
    @Environment(\.modelContext) private var modelContext
    @Query(sort: \Project.creationDate, order: .reverse) private var projects: [Project]

    @State private var selectedProject: Project?
    @State private var isCreatingProject = false
    @State private var isShowingSettings = false

    var body: some View {
        NavigationSplitView {
            List(selection: $selectedProject) {
                ForEach(projects) { project in
                    ProjectListItem(project: project)
                        .tag(project)
                }
                .onDelete(perform: deleteProjects)
            }
            .overlay {
                if projects.isEmpty {
                    ContentUnavailableView(
                        "Keine Projekte",
                        systemImage: "tray",
                        description: Text("Tippe auf +, um dein erstes Projekt zu erstellen.")
                    )
                }
            }
            .navigationTitle(Text("Projekte"))
            .toolbar {
                ToolbarItem(placement: .topBarTrailing) {
                    Button("Einstellungen", systemImage: "gearshape") {
                        isShowingSettings = true
                    }
                }
            }
            .sheet(isPresented: $isShowingSettings) {
                SettingsView()
            }
            .overlay(alignment: .bottomTrailing) {
                GlassEffectContainer {
                    Button {
                        isCreatingProject = true
                    } label: {
                        Image(systemName: "plus")
                            .font(.title2.weight(.semibold))
                            .frame(width: 56, height: 56)
                            .contentShape(.circle)
                    }
                    .buttonStyle(.plain)
                    .glassEffect(.regular.interactive(), in: .circle)
                }
                .padding()
                .accessibilityLabel("Projekt erstellen")
            }
            .sheet(isPresented: $isCreatingProject) {
                ProjectCreateView { project in
                    selectedProject = project
                }
            }
        } detail: {
            NavigationStack {
                if let selectedProject {
                    ProjectDetailView(project: selectedProject)
                } else {
                    ContentUnavailableView(
                        "Kein Projekt ausgewählt",
                        systemImage: "hand.point.up.left",
                        description: Text("Wähle links ein Projekt aus, um die Details zu sehen.")
                    )
                }
            }
        }
    }

    private func deleteProjects(at offsets: IndexSet) {
        for index in offsets {
            let project = projects[index]
            if project == selectedProject { selectedProject = nil }
            modelContext.delete(project)
        }
    }
}

#Preview("Gefüllt") {
    ProjectListView()
        .modelContainer(PreviewSupport.container)
}

#Preview("Leer") {
    ProjectListView()
        .modelContainer(PreviewSupport.makeEmptyContainer())
}