//
//  Button.swift
//  Adwaita
//
//  Created by auto-generation on 04.02.24.
//

import CAdw
import LevenshteinTransformations

/// The `GtkButton` widget is generally used to trigger a callback function that is
/// called when the button is pressed.
/// 
/// ![An example GtkButton](button.png)
/// 
/// The `GtkButton` widget can hold any valid child widget. That is, it can hold
/// almost any other standard `GtkWidget`. The most commonly used child is the
/// `GtkLabel`.
/// 
/// # CSS nodes
/// 
/// `GtkButton` has a single CSS node with name button. The node will get the
/// style classes .image-button or .text-button, if the content is just an
/// image or label, respectively. It may also receive the .flat style class.
/// When activating a button via the keyboard, the button will temporarily
/// gain the .keyboard-activating style class.
/// 
/// Other style classes that are commonly used with `GtkButton` include
/// .suggested-action and .destructive-action. In special cases, buttons
/// can be made round by adding the .circular style class.
/// 
/// Button-like widgets like [class@Gtk.ToggleButton], [class@Gtk.MenuButton],
/// [class@Gtk.VolumeButton], [class@Gtk.LockButton], [class@Gtk.ColorButton]
/// or [class@Gtk.FontButton] use style classes such as .toggle, .popup, .scale,
/// .lock, .color on the button node to differentiate themselves from a plain
/// `GtkButton`.
/// 
/// # Accessibility
/// 
/// `GtkButton` uses the %GTK_ACCESSIBLE_ROLE_BUTTON role.
public struct Button: Widget {

    /// Additional update functions for type extensions.
    var updateFunctions: [(ViewStorage) -> Void] = []
    /// Additional appear functions for type extensions.
    var appearFunctions: [(ViewStorage) -> Void] = []

    /// Whether the size of the button can be made smaller than the natural
    /// size of its contents.
    /// 
    /// For text buttons, setting this property will allow ellipsizing the label.
    /// 
    /// If the contents of a button are an icon or a custom widget, setting this
    /// property has no effect.
    var canShrink: Bool?
    /// The child widget.
    var child:  (() -> Body)?
    /// Whether the button has a frame.
    var hasFrame: Bool?
    /// The name of the icon used to automatically populate the button.
    var iconName: String?
    /// Text of the label inside the button, if the button contains a label widget.
    var label: String?
    /// If set, an underline in the text indicates that the following character is
    /// to be used as mnemonic.
    var useUnderline: Bool?
    /// Emitted to animate press then release.
    /// 
    /// This is an action signal. Applications should never connect
    /// to this signal, but use the [signal@Gtk.Button::clicked] signal.
    /// 
    /// The default bindings for this signal are all forms of the
    /// <kbd>␣</kbd> and <kbd>Enter</kbd> keys.
    var activate: (() -> Void)?
    /// Emitted when the button has been activated (pressed and released).
    var clicked: (() -> Void)?
    /// The application.
    var app: GTUIApp?
    /// The window.
    var window: GTUIApplicationWindow?

    /// Initialize `Button`.
    public init() {
    }

    /// Get the widget's view storage.
    /// - Parameter modifiers: The view modifiers.
    /// - Returns: The view storage.
    public func container(modifiers: [(View) -> View]) -> ViewStorage {
        let storage = ViewStorage(gtk_button_new()?.opaque())
        update(storage, modifiers: modifiers, updateProperties: true)
        if let childStorage = child?().widget(modifiers: modifiers).storage(modifiers: modifiers) {
            storage.content["child"] = [childStorage]
            gtk_button_set_child(storage.pointer?.cast(), childStorage.pointer?.cast())
        }


        for function in appearFunctions {
            function(storage)
        }
        return storage
    }

    /// Update the widget's view storage.
    /// - Parameters:
    ///     - storage: The view storage.
    ///     - modifiers: The view modifiers.
    ///     - updateProperties: Whether to update the view's properties.
    public func update(_ storage: ViewStorage, modifiers: [(View) -> View], updateProperties: Bool) {
        if let activate {
            storage.connectSignal(name: "activate", argCount: 0) {
                activate()
            }
        }
        if let clicked {
            storage.connectSignal(name: "clicked", argCount: 0) {
                clicked()
            }
        }
        storage.modify { widget in
            if let canShrink, updateProperties {
                gtk_button_set_can_shrink(widget?.cast(), canShrink.cBool)
            }
            if let widget = storage.content["child"]?.first {
                child?().widget(modifiers: modifiers).update(widget, modifiers: modifiers, updateProperties: updateProperties)
            }
            if let hasFrame, updateProperties {
                gtk_button_set_has_frame(widget?.cast(), hasFrame.cBool)
            }
            if let iconName, updateProperties {
                gtk_button_set_icon_name(widget?.cast(), iconName)
            }
            if let label, storage.content["child"] == nil, updateProperties {
                gtk_button_set_label(widget?.cast(), label)
            }
            if let useUnderline, updateProperties {
                gtk_button_set_use_underline(widget?.cast(), useUnderline.cBool)
            }


        }
        for function in updateFunctions {
            function(storage)
        }
    }

    /// Whether the size of the button can be made smaller than the natural
    /// size of its contents.
    /// 
    /// For text buttons, setting this property will allow ellipsizing the label.
    /// 
    /// If the contents of a button are an icon or a custom widget, setting this
    /// property has no effect.
    public func canShrink(_ canShrink: Bool? = true) -> Self {
        var newSelf = self
        newSelf.canShrink = canShrink
        
        return newSelf
    }

    /// The child widget.
    public func child(@ViewBuilder _ child: @escaping (() -> Body)) -> Self {
        var newSelf = self
        newSelf.child = child
        
        return newSelf
    }

    /// Whether the button has a frame.
    public func hasFrame(_ hasFrame: Bool? = true) -> Self {
        var newSelf = self
        newSelf.hasFrame = hasFrame
        
        return newSelf
    }

    /// The name of the icon used to automatically populate the button.
    public func iconName(_ iconName: String?) -> Self {
        var newSelf = self
        newSelf.iconName = iconName
        
        return newSelf
    }

    /// Text of the label inside the button, if the button contains a label widget.
    public func label(_ label: String?) -> Self {
        var newSelf = self
        newSelf.label = label
        
        return newSelf
    }

    /// If set, an underline in the text indicates that the following character is
    /// to be used as mnemonic.
    public func useUnderline(_ useUnderline: Bool? = true) -> Self {
        var newSelf = self
        newSelf.useUnderline = useUnderline
        
        return newSelf
    }

    /// Emitted to animate press then release.
    /// 
    /// This is an action signal. Applications should never connect
    /// to this signal, but use the [signal@Gtk.Button::clicked] signal.
    /// 
    /// The default bindings for this signal are all forms of the
    /// <kbd>␣</kbd> and <kbd>Enter</kbd> keys.
    public func activate(_ activate: @escaping () -> Void) -> Self {
        var newSelf = self
        newSelf.activate = activate
        return newSelf
    }

    /// Emitted when the button has been activated (pressed and released).
    public func clicked(_ clicked: @escaping () -> Void) -> Self {
        var newSelf = self
        newSelf.clicked = clicked
        return newSelf
    }

}
