//
//  List.swift
//  MacBackend
//
//  Created by david-swift on 23.11.2024.
//

import SwiftUI

/// A list widget.
public struct List<Element>: SwiftUIWidget where Element: Identifiable {

    /// The elements.
    var elements: [Element]
    /// The selected element.
    var selection: Meta.Binding<Element.ID?>
    /// The content for an element.
    var content: (Element) -> Body
    /// The action at the bottom.
    var bottomAction: ((String, Icon), () -> Void)?

    /// The wrapped views.
    public var wrappedViews: [String: any Meta.AnyView] {
        elements.reduce(into: [:]) { partialResult, element in
            partialResult["\(element.id)"] = content(element)
        }
    }

    /// Initialize a list widget.
    /// - Parameters:
    ///   - elements: The elements.
    ///   - selection: The selected element.
    ///   - content: The content for an element.
    public init(
        _ elements: [Element],
        selection: Meta.Binding<Element.ID?>,
        @Meta.ViewBuilder content: @escaping (Element) -> Body
    ) {
        self.elements = elements
        self.content = content
        self.selection = selection
    }

    /// Get the SwiftUI view.
    /// - Parameter properties: The widget data.
    /// - Returns: The SwiftUI view.
    public static func view(properties: Self) -> some SwiftUI.View {
        SwiftUI.List(properties.elements, selection: properties.selection.swiftUI) { element in
            MacBackendView("\(element.id)")
        }
        .safeAreaInset(edge: .bottom, alignment: .leading) {
            if let action = properties.bottomAction {
                SwiftUI.Button {
                    action.1()
                } label: {
                    SwiftUI.Label {
                        SwiftUI.Text(action.0.0)
                    } icon: {
                        action.0.1.image
                    }
                }
                .buttonStyle(.plain)
                .foregroundStyle(.secondary)
                .symbolVariant(.circle)
                .padding([.bottom, .leading], 7)
            }
        }
    }

    /// Add a button to the bottom of the list.
    /// - Parameters:
    ///   - label: The button's label.
    ///   - icon: The button's icon.
    ///   - handler: The handler.
    /// - Returns: The list.
    public func bottomAction(_ label: String, icon: Icon, handler: @escaping () -> Void) -> Self {
        modify { $0.bottomAction = ((label, icon), handler) }
    }

}