import SwiftUI

struct FilesView: View {

    @EnvironmentObject
    private var content: Content

    @State
    private var selected: FileResource? = nil

    var body: some View {
        NavigationSplitView {
            List(content.files, selection: $selected) { file in
                Text(file.uniqueId)
                    .tag(file)
            }
            .toolbar {
                ToolbarItem(placement: .primaryAction) {
                    Button(action: openFilePanel) {
                        Label("Add file", systemSymbol: .plus)
                    }
                }
            }
            .navigationSplitViewColumnWidth(min: 250, ideal: 250, max: 250)
        } content: {
            if let selected {
                FileContentView(file: selected)
                    .id(selected.uniqueId)
            } else {
                Text("Select a file")
            }
        } detail: {
            if let selected {
                FileDetailView(file: selected)
            } else {
                EmptyView()
            }
        }
    }

    private func openFilePanel() {
        let panel = NSOpenPanel()
        // Sets up so user can only select a single directory
        panel.canChooseFiles = true
        panel.canChooseDirectories = false
        panel.allowsMultipleSelection = true
        panel.showsHiddenFiles = false
        panel.title = "Select files to add"
        panel.prompt = ""

        let response = panel.runModal()
        guard response == .OK else {
            print("Failed to select files to import")
            return
        }

        for url in panel.urls {
            let fileId = url.lastPathComponent
            guard !content.files.contains(where: { $0.uniqueId == fileId }) else {
                print("A file '\(fileId)' already exists")
                continue
            }
            let type = FileType(fileExtension: fileId.fileExtension)
            let file = FileResource(type: type, uniqueId: fileId, description: "")
            guard content.storage.copyFile(at: url, fileId: fileId) else {
                print("Failed to import file '\(fileId)'")
                continue
            }
            content.files.insert(file, at: 0)
        }
    }


}

#Preview {
    FilesView()
        .environmentObject(Content.mock)
}