import SwiftUI

struct ContentView: View {
    @EnvironmentObject private var settings: AppSettings
    @StateObject private var coordinator = ConversionCoordinator()
    @State private var showSettings = false

    var body: some View {
        VStack(spacing: 16) {
            DropZoneView()

            if !coordinator.items.isEmpty {
                FileListView()

                if !coordinator.problemItems.isEmpty {
                    Text("\(coordinator.problemItems.count) Datei(en) brauchen Aufmerksamkeit.")
                        .font(.footnote)
                        .foregroundStyle(.orange)
                }

                HStack {
                    ProgressView(value: coordinator.overallProgress)
                    Button("Leeren") { coordinator.removeAll() }
                        .disabled(coordinator.isRunning)
                }
            }

            Divider()

            HStack {
                Button("Einstellungen…") { showSettings = true }
                Spacer()
                Button("Start") {
                    guard let target = settings.targetFolder else { return }
                    coordinator.start(targetFolder: target)
                }
                .keyboardShortcut(.defaultAction)
                .disabled(coordinator.items.isEmpty || coordinator.isRunning || settings.targetFolder == nil)
            }
        }
        .padding(20)
        .frame(minWidth: 520, minHeight: 460)
        .environmentObject(coordinator)
        .sheet(isPresented: $showSettings) {
            SettingsView()
        }
        .alert(
            "Zieldatei existiert bereits",
            isPresented: Binding(
                get: { !coordinator.pendingConflicts.isEmpty },
                set: { isPresented in
                    if !isPresented { coordinator.cancelConflictResolution() }
                }
            )
        ) {
            Button("Überspringen") { coordinator.resolveConflicts(overwrite: false) }
            Button("Ersetzen", role: .destructive) { coordinator.resolveConflicts(overwrite: true) }
            Button("Abbrechen", role: .cancel) { coordinator.cancelConflictResolution() }
        } message: {
            Text(conflictMessage)
        }
    }

    private var conflictMessage: String {
        let names = coordinator.pendingConflicts.map(\.fileName).joined(separator: ", ")
        return "Für folgende Datei(en) existiert die Zieldatei schon: \(names). Ersetzen oder überspringen?"
    }
}