//
//  Copyright (c) 2023 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 TIUIKitCore
import UIKit

extension UIButton {
    public func configureUIButton(appearance: BaseAppearance<some ViewLayout, some BaseContentLayout>,
                                  for state: UIControl.State = .normal) {

        appearance.textAttributes?
            .configure(button: self,
                       with: title(for: state),
                       for: state)

        if #available(iOS 15, *) {
            var config = configuration ?? .plain()

            configureInsets(in: &config,
                            contentInsets: appearance.contentLayout.contentInsets.replacingNan(with: .zero),
                            titleInsets: appearance.contentLayout.titleInsets.replacingNan(with: .zero),
                            imageInsets: appearance.contentLayout.imageInsets.replacingNan(with: .zero))

            configuration = config
        } else {
            contentEdgeInsets = appearance.contentLayout.contentInsets.replacingNan(with: .zero)
            titleEdgeInsets = appearance.contentLayout.titleInsets.replacingNan(with: .zero)
            imageEdgeInsets = appearance.contentLayout.imageInsets.replacingNan(with: .zero)
        }

        super.configureUIView(appearance: appearance)
    }

    @available(iOS 15.0, *)
    private func configureInsets(in config: inout UIButton.Configuration,
                                 contentInsets: UIEdgeInsets,
                                 titleInsets: UIEdgeInsets,
                                 imageInsets: UIEdgeInsets) {

        let topContentInset = contentInsets.top + titleInsets.top
        let bottomContentInset = contentInsets.bottom + titleInsets.bottom

        let fullLeadingContentInset = contentInsets.left + titleInsets.left
        let fullTrailingContentInset = contentInsets.right + titleInsets.right

        let hasNonEmptyImage = [
            config.image,
            currentImage
        ]
        .compactMap { $0 }
        .contains { !($0.size.width.isZero || $0.size.height.isZero) }

        if hasNonEmptyImage {
            let leadingContentInset: CGFloat
            let trailingContentInset: CGFloat
            let imagePadding: CGFloat

            switch config.imagePlacement {
            case .leading:
                leadingContentInset = contentInsets.left
                trailingContentInset = fullTrailingContentInset
                imagePadding = titleInsets.left + imageInsets.right

            case .trailing:
                leadingContentInset = fullLeadingContentInset
                trailingContentInset = contentInsets.right
                imagePadding = titleInsets.right + imageInsets.left

            default:
                leadingContentInset = fullLeadingContentInset
                trailingContentInset = fullTrailingContentInset
                imagePadding = .zero
            }

            config.contentInsets = NSDirectionalEdgeInsets(top: topContentInset,
                                                           leading: leadingContentInset,
                                                           bottom: bottomContentInset,
                                                           trailing: trailingContentInset)

            config.imagePadding = imagePadding
        } else {
            config.contentInsets = NSDirectionalEdgeInsets(top: topContentInset,
                                                           leading: fullLeadingContentInset,
                                                           bottom: bottomContentInset,
                                                           trailing: fullTrailingContentInset)
        }
    }
}