LeadKit/TIBottomSheet/Sources/BottomSheet/Views/ModalHeaderView.swift

//
//  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 TIUIElements
import TIUIKitCore
import UIKit

open class ModalHeaderView: BaseInitializableView, AppearanceConfigurable {

    // MARK: - Nested Types

    public enum State {
        case hidden
        case presented(Appearance)
    }

    public enum ContentViewState {
        case none
        case buttonLeft(BaseButtonStyle)
        case buttonRight(BaseButtonStyle)
        case buttons(left: BaseButtonStyle, right: BaseButtonStyle)
        case custom(view: UIView, appearance: UIView.BaseWrappedAppearance<UIView.DefaultWrappedLayout>)
    }

    // MARK: - Public properties

    public let leftButton = StatefulButton()
    public let rightButton = StatefulButton()

    public var leftButtonConstraints: SubviewConstraints?
    public var rightButtonConstraints: SubviewConstraints?
    public var customViewConstraints: SubviewConstraints?

    // MARK: - BaseInitializableView

    open override func addViews() {
        super.addViews()

        addSubviews(leftButton, rightButton)
    }

    open override func configureLayout() {
        super.configureLayout()

        [leftButton, rightButton]
            .forEach { $0.translatesAutoresizingMaskIntoConstraints = false }

        let leftButtonConstraints = SubviewConstraints(
            centerYConstraint: leftButton.centerYAnchor.constraint(equalTo: centerYAnchor),
            leadingConstraint: leftButton.leadingAnchor.constraint(equalTo: leadingAnchor),
            topConstraint: leftButton.topAnchor.constraint(equalTo: topAnchor),
            bottomConstraint: leftButton.bottomAnchor.constraint(equalTo: bottomAnchor))

        let rightButtonConstraints = SubviewConstraints(
            centerYConstraint: rightButton.centerYAnchor.constraint(equalTo: centerYAnchor),
            topConstraint: rightButton.topAnchor.constraint(equalTo: topAnchor),
            trailingConstraint: rightButton.trailingAnchor.constraint(equalTo: trailingAnchor),
            bottomConstraint: rightButton.bottomAnchor.constraint(equalTo: bottomAnchor))
        self.leftButtonConstraints = leftButtonConstraints
        self.rightButtonConstraints = rightButtonConstraints

        NSLayoutConstraint.activate(leftButtonConstraints.constraints + rightButtonConstraints.constraints)
    }

    // MARK: - AppearanceConfigurable

    open func configure(appearance: Appearance) {
        configureUIView(appearance: appearance)

        configureContentView(state: appearance.contentViewState)
    }

    open func configureContentView(state: ContentViewState) {
        var leftButtonStyle: BaseButtonStyle?
        var rightButtonStyle: BaseButtonStyle?

        switch state {
        case let .buttonLeft(style):
            leftButtonStyle = style

        case let .buttonRight(style):
            rightButtonStyle = style

        case let .buttons(left, right):
            leftButtonStyle = left
            rightButtonStyle = right

        case let .custom(view, appearance):
            configureCustomView(view, withLayout: appearance.layout)
            view.configureUIView(appearance: appearance)

        default:
            break
        }

        configure(buttonStyle: leftButtonStyle, forButton: leftButton, constraints: leftButtonConstraints)
        configure(buttonStyle: rightButtonStyle, forButton: rightButton, constraints: rightButtonConstraints)
    }

    // MARK: - Private methods

    private func configureCustomView(_ view: UIView, withLayout layout: WrappedViewLayout) {
        addSubview(view)

        view.translatesAutoresizingMaskIntoConstraints = false

        let customViewConstraints = SubviewConstraints(
            centerXConstraint: view.centerXAnchor.constraint(equalTo: centerXAnchor),
            centerYConstraint: view.centerYAnchor.constraint(equalTo: centerYAnchor),
            leadingConstraint: view.leadingAnchor.constraint(equalTo: leadingAnchor),
            topConstraint: view.topAnchor.constraint(equalTo: topAnchor),
            trailingConstraint: view.trailingAnchor.constraint(equalTo: trailingAnchor),
            bottomConstraint: view.bottomAnchor.constraint(equalTo: bottomAnchor))
        self.customViewConstraints = customViewConstraints

        NSLayoutConstraint.deactivate(customViewConstraints.centerConstraints)

        Self.configure(layout: layout, constraints: customViewConstraints)
    }

    private func configure(buttonStyle: BaseButtonStyle?,
                           forButton button: StatefulButton,
                           constraints: SubviewConstraints?) {

        guard let buttonStyle else {
            button.isHidden = true
            return
        }

        button.isHidden = false

        if let layout = buttonStyle.appearance[.normal]?.layout, let constraints {
            UIView.configure(layout: layout, constraints: constraints)
        }

        button.apply(style: buttonStyle)
    }
}

// MARK: - Appearance

extension ModalHeaderView {

    public final class Appearance: UIView.BaseWrappedAppearance<UIView.DefaultWrappedLayout>, WrappedViewAppearance {
        public static var defaultAppearance: Self {
            .init()
        }

        public var contentViewState: ContentViewState

        public init(layout: UIView.DefaultWrappedLayout = .defaultLayout,
                    backgroundColor: UIColor = .clear,
                    border: UIViewBorder = .init(),
                    shadow: UIViewShadow? = nil,
                    contentViewState: ContentViewState = .none) {

            self.contentViewState = contentViewState

            super.init(layout: layout, backgroundColor: backgroundColor, border: border, shadow: shadow)
        }
    }
}