import SwiftUI
import UniformTypeIdentifiers

struct DropZoneView: View {
    @EnvironmentObject private var settings: AppSettings
    @EnvironmentObject private var coordinator: ConversionCoordinator
    @State private var isTargeted = false

    var body: some View {
        VStack(spacing: 12) {
            Image(systemName: "arrow.down.doc")
                .font(.system(size: 36))
                .foregroundStyle(.secondary)
            Text("9:16-Dateien hierher ziehen")
                .font(.headline)
            Button("Datei(en) wählen…", action: chooseFiles)
        }
        .frame(maxWidth: .infinity, minHeight: 140)
        .background(
            RoundedRectangle(cornerRadius: 12)
                .strokeBorder(style: StrokeStyle(lineWidth: 2, dash: [6]))
                .foregroundStyle(isTargeted ? Color.accentColor : Color.secondary.opacity(0.35))
        )
        .onDrop(of: [.fileURL], isTargeted: $isTargeted, perform: handleDrop)
    }

    private func chooseFiles() {
        let panel = NSOpenPanel()
        panel.allowsMultipleSelection = true
        panel.canChooseDirectories = false
        panel.canChooseFiles = true
        panel.allowedContentTypes = [.movie, .quickTimeMovie, .mpeg4Movie]
        if let sourceFolder = settings.sourceFolder {
            panel.directoryURL = sourceFolder
        }
        guard panel.runModal() == .OK else { return }
        coordinator.addFiles(panel.urls)
    }

    private func handleDrop(providers: [NSItemProvider]) -> Bool {
        guard !providers.isEmpty else { return false }
        let group = DispatchGroup()
        var urls: [URL] = []
        for provider in providers {
            group.enter()
            _ = provider.loadObject(ofClass: URL.self) { url, _ in
                if let url { urls.append(url) }
                group.leave()
            }
        }
        group.notify(queue: .main) {
            coordinator.addFiles(urls)
        }
        return true
    }
}