import SwiftUI

/// A single-`TextField` alert — the "name a new thing" prompt shared by New Board, New Lane, and
/// New Card, so each toolbar button does not grow its own `@State` pair and `.alert` block.
private struct TitlePromptAlert: ViewModifier {
    @Binding var isPresented: Bool
    let titleText: String
    let message: String?
    let placeholder: String
    let onSubmit: (String) -> Void

    @State private var text = ""

    func body(content: Content) -> some View {
        content.alert(titleText, isPresented: $isPresented) {
            TextField(placeholder, text: $text)
            Button("Create") {
                let trimmed = text.trimmingCharacters(in: .whitespacesAndNewlines)
                text = ""
                onSubmit(trimmed)
            }
            Button("Cancel", role: .cancel) { text = "" }
        } message: {
            if let message { Text(message) }
        }
    }
}

extension View {
    /// Presents a title-only creation prompt. `onSubmit` receives the trimmed text, which may be
    /// empty — every create call this feeds (`BoardIndexStore.createBoard`, `BoardWriter.createLane`,
    /// `BoardWriter.createCard`) already treats an empty/whitespace title as "no title" and falls
    /// back to the untitled placeholder, exactly as a hand-emptied field would.
    func titlePromptAlert(
        _ titleText: String,
        isPresented: Binding<Bool>,
        message: String? = nil,
        placeholder: String = "Title",
        onSubmit: @escaping (String) -> Void
    ) -> some View {
        modifier(TitlePromptAlert(
            isPresented: isPresented,
            titleText: titleText,
            message: message,
            placeholder: placeholder,
            onSubmit: onSubmit
        ))
    }
}