import SwiftUI
import SwiftData
import Storage
import BookParser

struct MacLibraryView: View {
	@Environment(\.modelContext) private var modelContext
	@Query(sort: \StoredBook.lastRead, order: .reverse) private var books: [StoredBook]
	@State private var selectedBook: StoredBook?
	@State private var showFileImporter = false

	private var bookStore: BookStore {
		BookStore(
			modelContainer: modelContext.container,
			documentsDirectory: FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
		)
	}

	var body: some View {
		NavigationSplitView {
			List(books, selection: $selectedBook) { book in
				VStack(alignment: .leading) {
					Text(book.title).font(.headline)
					if let author = book.author {
						Text(author).font(.subheadline).foregroundStyle(.secondary)
					}
				}
				.tag(book)
				.contextMenu {
					Button("Delete", role: .destructive) {
						try? bookStore.deleteBook(book)
					}
				}
			}
			.navigationTitle("Library")
			.toolbar {
				Button("Import", systemImage: "plus") {
					showFileImporter = true
				}
			}
			.fileImporter(
				isPresented: $showFileImporter,
				allowedContentTypes: [.epub, .plainText],
				allowsMultipleSelection: false
			) { result in
				handleImport(result)
			}
		} detail: {
			if let selectedBook {
				MacReaderView(storedBook: selectedBook)
			} else {
				ContentUnavailableView("Select a Book", systemImage: "book", description: Text("Choose a book from the sidebar or import one."))
			}
		}
	}

	private func handleImport(_ result: Result<[URL], Error>) {
		guard case .success(let urls) = result, let url = urls.first else { return }
		guard url.startAccessingSecurityScopedResource() else { return }
		defer { url.stopAccessingSecurityScopedResource() }

		Task {
			do {
				let parsed = try BookParser.parse(url: url)
				try bookStore.importBook(from: url, title: parsed.title, author: parsed.author)
			} catch {
				print("Import failed: \(error)")
			}
		}
	}
}