import SwiftUI

struct JumpToLineView: View {
    @Binding var isPresented: Bool
    let totalLines: Int
    let onJump: (Int) -> Void
    @State private var input = ""
    @FocusState private var focused: Bool

    var body: some View {
        VStack(spacing: 16) {
            Text("Jump to Line").font(.headline)
            HStack {
                TextField("Line (1–\(totalLines))", text: $input)
                    .textFieldStyle(.roundedBorder).keyboardType(.numberPad).focused($focused).onSubmit { commit() }
                Button("Go", action: commit).buttonStyle(.borderedProminent).disabled(parsed == nil)
            }
        }
        .padding(24).frame(width: 320)
        .onAppear { focused = true }
    }

    private var parsed: Int? {
        guard let n = Int(input), n >= 1, n <= totalLines else { return nil }
        return n
    }
    private func commit() {
        guard let line = parsed else { return }
        onJump(line); isPresented = false
    }
}