import SwiftUI
import SwiftData
import Storage
import BookParser

struct LibraryView: View {
	@Environment(\.modelContext) private var modelContext
	@Query(sort: \StoredBook.lastRead, order: .reverse) private var books: [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 {
		NavigationStack {
			List {
				ForEach(books) { book in
					NavigationLink(value: book) {
						VStack(alignment: .leading) {
							Text(book.title)
								.font(.headline)
							if let author = book.author {
								Text(author)
									.font(.subheadline)
									.foregroundStyle(.secondary)
							}
						}
					}
				}
				.onDelete(perform: deleteBooks)
			}
			.navigationTitle("Library")
			.navigationDestination(for: StoredBook.self) { storedBook in
				ReaderView(storedBook: storedBook)
			}
			.toolbar {
				Button("Import", systemImage: "plus") {
					showFileImporter = true
				}
			}
			.fileImporter(
				isPresented: $showFileImporter,
				allowedContentTypes: [.epub, .plainText],
				allowsMultipleSelection: false
			) { result in
				handleImport(result)
			}
		}
	}

	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)")
			}
		}
	}

	private func deleteBooks(at offsets: IndexSet) {
		for index in offsets {
			try? bookStore.deleteBook(books[index])
		}
	}
}