//
//  Alert.swift
//  MacBackend
//
//  Created by david-swift on 01.12.2024.
//

import SwiftUI

/// The alert view.
public struct Alert: SwiftUIWidget {

    /// The alert's title.
    var title: String
    /// The alert's description.
    var description: String
    /// Whether the alert is presented.
    var isPresented: Meta.Binding<Bool>
    /// The alert's actions.
    var actions: [Action] = []
    /// The wrapped view.
    var child: Meta.AnyView

    /// The wrapped views.
    public var wrappedViews: [String: Meta.AnyView] {
        [.mainContent: child]
    }

    /// Initialize the alert.
    /// - Parameters:
    ///   - title: The alert's title.
    ///   - description: The alert's description.
    ///   - isPresented: Whether the alert is presented.
    ///   - child: The wrapped view.
    public init(title: String, description: String, isPresented: Meta.Binding<Bool>, child: Meta.AnyView) {
        self.title = title
        self.description = description
        self.isPresented = isPresented
        self.child = child
    }

    /// An alert action.
    enum Action {

        /// A regular button.
        case button(button: Button)
        /// A cancel button.
        case cancel(button: Button)
        /// A destructive button.
        case destructive(button: Button)

        /// Get the SwiftUI button.
        @SwiftUI.ViewBuilder var button: some SwiftUI.View {
            switch self {
            case let .button(button):
                button.button()
            case let .cancel(button):
                button.button(cancel: true)
            case let .destructive(button):
                button.button(destructive: true)
            }
        }

    }

    /// The button.
    struct Button {

        /// The button's label.
        var label: String
        /// The button's action.
        var action: () -> Void
        /// Whether it is the default action.
        var defaultAction: Bool

        /// Get the SwiftUI button.
        /// - Parameters:
        ///   - cancel: Whether it is the cancel action.
        ///   - destructive: Whether it is a destructive action.
        /// - Returns: The SwiftUI view.
        @SwiftUI.ViewBuilder
        func button(cancel: Bool = false, destructive: Bool = false) -> some SwiftUI.View {
            let button = SwiftUI.Button(
                label,
                role: cancel ? .cancel : (destructive ? .destructive : nil),
                action: action
            )
            if defaultAction {
                button
                    .keyboardShortcut(.defaultAction)
            } else {
                button
            }
        }

    }

    /// Get the SwiftUI view.
    /// - Parameter properties: The widget data.
    /// - Returns: The SwiftUI view.
    public static func view(properties: Self) -> some SwiftUI.View {
        MacBackendView(.mainContent)
            .alert(properties.title, isPresented: properties.isPresented.swiftUI) {
                SwiftUI.ForEach(Array(properties.actions.enumerated()), id: \.offset) { action in
                    action.element.button
                }
            } message: {
                SwiftUI.Text(properties.description)
            }
    }

    /// Add a button to the alert.
    /// - Parameters:
    ///   - label: The button's label.
    ///   - defaultAction: Whether it is a default action.
    ///   - action: The handler.
    /// - Returns: The alert.
    public func button(
        _ label: String,
        default defaultAction: Bool = false,
        action: @escaping () -> Void
    ) -> Self {
        modify { alert in
            alert.actions.append(.button(button: .init(label: label, action: action, defaultAction: defaultAction)))
        }
    }

    /// Add a cancel button to the alert.
    /// - Parameters:
    ///   - label: The button's label.
    ///   - defaultAction: Whether it is a default action.
    ///   - action: The handler.
    /// - Returns: The alert.
    public func cancelButton(
        _ label: String,
        default defaultAction: Bool = false,
        action: @escaping () -> Void
    ) -> Self {
        modify { alert in
            alert.actions.append(.cancel(button: .init(label: label, action: action, defaultAction: defaultAction)))
        }
    }

    /// Add a destructive button to the alert.
    /// - Parameters:
    ///   - label: The button's label.
    ///   - defaultAction: Whether it is a default action.
    ///   - action: The handler.
    /// - Returns: The alert.
    public func destructiveButton(
        _ label: String,
        default defaultAction: Bool = false,
        action: @escaping () -> Void
    ) -> Self {
        modify { alert in
            alert.actions
                .append(.destructive(button: .init(label: label, action: action, defaultAction: defaultAction)))
        }
    }

}