import SwiftUI

extension NewTaskView {

    /// A container view that wraps form content with tap-to-dismiss keyboard functionality.
    ///
    /// This view provides a transparent overlay that appears when any text field has focus,
    /// allowing users to dismiss the keyboard by tapping anywhere outside the input fields.
    /// This improves the user experience by making it easier to exit text editing mode without
    /// needing to explicitly tap a "Done" button or similar control.
    struct Content<Content: View>: View {

        // MARK: Properties

        /// Binding to track which text field currently has keyboard focus.
        @FocusState.Binding
        var inputFocus: InputFieldFocus?

        /// The view content to display.
        private let content: Content

        // MARK: Initialization

        /// Initializes the new task content with custom form content.
        ///
        /// - Parameters:
        ///   - inputFocus: A binding to track keyboard focus state
        ///   - content: A closure that provides the view content to render
        init(
            inputFocus: FocusState<InputFieldFocus?>.Binding,
            @ViewBuilder content: () -> Content
        ) {
            self._inputFocus = inputFocus
            self.content = content()
        }

        // MARK: Body

        /// The view's body that combines the form content with a dismissal overlay.
        ///
        /// This approach allows users to tap anywhere on the screen to exit text editing
        /// mode, which is particularly useful on iOS where the keyboard can obscure
        /// significant screen space.
        var body: some View {
            ZStack {
                content

                if inputFocus != nil {
                    Color.clear
                        .contentShape(Rectangle())
                        .onTapGesture {
                            inputFocus = nil
                        }
                }
            }
        }

    }
}

// MARK: - Previews

#Preview("New todo task content") {
    struct PreviewWrapper: View {
        @FocusState
        private var inputFocus: InputFieldFocus?

        var body: some View {
            NewTaskView.Content(inputFocus: $inputFocus) {
                Form {
                    TextField(
                        "Title",
                        text: .constant(
                            "Sample Task"
                        )
                    )
                    .focused(
                        $inputFocus,
                        equals: .title
                    )
                }
            }
        }
    }

    return PreviewWrapper()
}