LeadKit/TIUIElements/Sources/Views/TitleSubtitleView/BaseTitleSubtitleView/BaseTitleSubtitleView.swift

//
//  Copyright (c) 2023 Touch Instinct
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//
//  The above copyright notice and this permission notice shall be included in
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//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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import TIUIKitCore
import UIKit

open class BaseTitleSubtitleView<TitleView: UIView, SubtitleView: UIView>: BaseInitializableView {
    public let titleView = TitleView()
    public let subtitleView = SubtitleView()

    public internal(set) lazy var titleBottomToSuperviewConstraint: NSLayoutConstraint = {
        titleView.bottomAnchor.constraint(equalTo: bottomAnchor)
    }()

    public internal(set) lazy var titleBottomToSubtitleConstraint: NSLayoutConstraint = {
        titleView.bottomAnchor.constraint(equalTo: subtitleView.topAnchor)
    }()

    public internal(set) lazy var titleConstraints: SubviewConstraints = {
        let leadingConstraint = titleView.leadingAnchor.constraint(equalTo: leadingAnchor)
        let trailingConstraint = titleView.trailingAnchor.constraint(equalTo: trailingAnchor)
        let topConstraint = titleView.topAnchor.constraint(equalTo: topAnchor)

        let edgeConstraints = EdgeConstraints(leadingConstraint: leadingConstraint,
                                              trailingConstraint: trailingConstraint,
                                              topConstraint: topConstraint,
                                              bottomConstraint: titleBottomToSubtitleConstraint)

        let centerXConstraint = titleView.centerXAnchor.constraint(equalTo: centerXAnchor)
        let centerYConstraint = titleView.centerYAnchor.constraint(equalTo: centerYAnchor)

        let centerConstraints = CenterConstraints(centerXConstraint: centerXConstraint,
                                                  centerYConstraint: centerYConstraint)

        let sizeConstraints = SizeConstraints(widthConstraint: titleView.widthAnchor.constraint(equalToConstant: .zero),
                                              heightConstraint: titleView.heightAnchor.constraint(equalToConstant: .zero))

        return SubviewConstraints(edgeConstraints: edgeConstraints,
                                  centerConstraints: centerConstraints,
                                  sizeConstraints: sizeConstraints)
    }()

    public internal(set) lazy var subtitleConstraints: SubviewConstraints = {
        let leadingConstraint = subtitleView.leadingAnchor.constraint(equalTo: leadingAnchor)
        let trailingConstraint = subtitleView.trailingAnchor.constraint(equalTo: trailingAnchor)
        let bottomConstraint = subtitleView.bottomAnchor.constraint(equalTo: bottomAnchor)

        let edgeConstraints = EdgeConstraints(leadingConstraint: leadingConstraint,
                                              trailingConstraint: trailingConstraint,
                                              topConstraint: titleBottomToSubtitleConstraint,
                                              bottomConstraint: bottomConstraint)

        let centerXConstraint = subtitleView.centerXAnchor.constraint(equalTo: centerXAnchor)
        let centerYConstraint = subtitleView.centerYAnchor.constraint(equalTo: centerYAnchor)

        let centerConstraints = CenterConstraints(centerXConstraint: centerXConstraint,
                                                  centerYConstraint: centerYConstraint)

        let sizeConstraints = SizeConstraints(widthConstraint: subtitleView.widthAnchor.constraint(equalToConstant: .zero),
                                              heightConstraint: subtitleView.heightAnchor.constraint(equalToConstant: .zero))

        return SubviewConstraints(edgeConstraints: edgeConstraints,
                                  centerConstraints: centerConstraints,
                                  sizeConstraints: sizeConstraints)
    }()

    // MARK: - InitializableViewProtocol

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

        addSubviews(titleView, subtitleView)
    }

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

        [titleView, subtitleView]
            .forEach { $0.translatesAutoresizingMaskIntoConstraints = false }
    }

    // MARK: - Public methods

    open func setSubtitle(hidden: Bool) {
        guard subtitleView.isHidden != hidden else {
            return
        }

        subtitleView.isHidden = hidden
    }

    // MARK: - AppearanceConfigurable

    open func configureBaseTitleSubtitle(appearance: Appearance<some WrappedViewAppearance,
                                                                  some WrappedViewAppearance>) {

        configureUIView(appearance: appearance)

        configure(layout: appearance.layout,
                  titleLayout: appearance.titleAppearance.layout,
                  subtitleLayout: appearance.subtitleAppearance.layout,
                  subtitleHidden: subtitleView.isHidden)
    }

    public func configure(layout: some SpacedWrappedViewLayout,
                          titleLayout: some WrappedViewLayout,
                          subtitleLayout: some WrappedViewLayout,
                          subtitleHidden: Bool) {

        titleConstraints.edgeConstraints.bottomConstraint.isActive = false

        titleConstraints.edgeConstraints.bottomConstraint = subtitleHidden
            ? titleBottomToSuperviewConstraint
            : titleBottomToSubtitleConstraint

        titleConstraints.update(from: titleLayout)

        let spacing: CGFloat

        let titleBottomInset = titleLayout.insets.bottom

        if subtitleHidden {
            spacing = titleBottomInset.isFinite
                ? layout.spacing + titleBottomInset
                : layout.spacing

            subtitleConstraints.deactivate()
        } else {
            let verticalInsets = titleLayout.insets.add(\.bottom,
                                                        to: \.top,
                                                        of: subtitleLayout.insets)

            spacing = verticalInsets.isFinite
                ? layout.spacing + verticalInsets
                : layout.spacing

            subtitleConstraints.update(from: subtitleLayout)
        }

        titleBottomToSubtitleConstraint.constant = -spacing
    }
}