//
//  Copyright (c) 2022 Touch Instinct
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the Software), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

import CoreGraphics
import QuartzCore

public struct CALayerDrawingOperation: DrawingOperation {
    public var layer: CALayer
    public var offset: CGPoint

    public init(layer: CALayer,
                offset: CGPoint) {

        self.layer = layer
        self.offset = offset
    }

    // MARK: - DrawingOperation

    public func affectedArea(in context: CGContext? = nil) -> CGRect {
        CGRect(origin: offset, size: layer.bounds.size)
    }

    public func apply(in context: CGContext) {
        let offsetTransform = CGAffineTransform(translationX: offset.x, y: offset.y)

        context.concatenate(offsetTransform)
        layer.render(in: context)
        offsetTransform.concatenating(offsetTransform.inverted())
    }
}