//! A `WebViewHandle` represents an underlying `WKWebView`. You're passed a reference to one during your
//! `WebViewController::did_load()` method. This method is safe to store and use, however as it's
//! UI-specific it's not thread safe.
//!
//! You can use this struct to configure how a view should look and layout. It implements
//! AutoLayout - for more information, see the AutoLayout tutorial.

use objc_id::ShareId;
use objc::runtime::Object;
use objc::{msg_send, sel, sel_impl};

use crate::foundation::{id, YES, NSArray, NSString};
use crate::color::Color;
use crate::constants::BACKGROUND_COLOR;
use crate::layout::{Layout, LayoutAnchorX, LayoutAnchorY, LayoutAnchorDimension};
use crate::pasteboard::PasteboardType;

/// A clone-able handler to a `ViewController` reference in the Objective C runtime. We use this
/// instead of a stock `WKWebView` for easier recordkeeping, since it'll need to hold the `WKWebView` on that
/// side anyway.
#[derive(Debug, Default, Clone)]
pub struct WebViewHandle {
    /// A pointer to the Objective-C runtime view controller.
    pub objc: Option<ShareId<Object>>,

    /// A pointer to the Objective-C runtime top layout constraint.
    pub top: LayoutAnchorY,

    /// A pointer to the Objective-C runtime leading layout constraint.
    pub leading: LayoutAnchorX,

    /// A pointer to the Objective-C runtime trailing layout constraint.
    pub trailing: LayoutAnchorX,

    /// A pointer to the Objective-C runtime bottom layout constraint.
    pub bottom: LayoutAnchorY,

    /// A pointer to the Objective-C runtime width layout constraint.
    pub width: LayoutAnchorDimension,

    /// A pointer to the Objective-C runtime height layout constraint.
    pub height: LayoutAnchorDimension,

    /// A pointer to the Objective-C runtime center X layout constraint.
    pub center_x: LayoutAnchorX,

    /// A pointer to the Objective-C runtime center Y layout constraint.
    pub center_y: LayoutAnchorY
}

impl WebViewHandle {
    pub(crate) fn new(object: ShareId<Object>) -> Self {
        let view: id = unsafe {
            msg_send![&*object, view]
        };

        WebViewHandle {
            objc: Some(object),
            top: LayoutAnchorY::new(unsafe { msg_send![view, topAnchor] }),
            leading: LayoutAnchorX::new(unsafe { msg_send![view, leadingAnchor] }),
            trailing: LayoutAnchorX::new(unsafe { msg_send![view, trailingAnchor] }),
            bottom: LayoutAnchorY::new(unsafe { msg_send![view, bottomAnchor] }),
            width: LayoutAnchorDimension::new(unsafe { msg_send![view, widthAnchor] }),
            height: LayoutAnchorDimension::new(unsafe { msg_send![view, heightAnchor] }),
            center_x: LayoutAnchorX::new(unsafe { msg_send![view, centerXAnchor] }),
            center_y: LayoutAnchorY::new(unsafe { msg_send![view, centerYAnchor] }),
        }
    }
}