//
//  TooltipAlertViewController.swift
//  VDS
//
//  Created by Matt Bruce on 4/14/23.
//

import Foundation
import UIKit
import Combine
import VDSColorTokens

open class TooltipAlertViewController: UIViewController, Surfaceable, UIScrollViewDelegate {
    
    /// Set of Subscribers for any Publishers for this Control
    public var subscribers = Set<AnyCancellable>()

    //--------------------------------------------------
    // MARK: - Private Properties
    //--------------------------------------------------
    private var onClickSubscriber: AnyCancellable? {
        willSet {
            if let onClickSubscriber {
                onClickSubscriber.cancel()
            }
        }
    }
    
    private var scrollView = UIScrollView().with {
        $0.translatesAutoresizingMaskIntoConstraints = false
        $0.backgroundColor = .clear
    }

    private let modalView = View().with {
        $0.layer.cornerRadius = 8
    }

    public var contentView: UIView? = nil

    private let contentStackView = UIStackView().with {
        $0.translatesAutoresizingMaskIntoConstraints = false
        $0.axis = .vertical
        $0.distribution = .fillProportionally
        $0.spacing = 0
    }
    
    private var line = Line().with { instance in
        instance.lineViewColorConfiguration = SurfaceColorConfiguration(VDSColor.elementsLowcontrastOnlight, VDSColor.elementsLowcontrastOndark).eraseToAnyColorable()
    }
        
    //--------------------------------------------------
    // MARK: - Public Properties
    //--------------------------------------------------
    open var surface: Surface = .light { didSet { updateView() }}
    open var titleText: String? { didSet { updateView() }}
    open var titleLabel = Label().with { label in
        label.textStyle = .boldTitleMedium
    }
    
    open var contentText: String? { didSet { updateView() }}
    open var contentLabel = Label().with { label in
        label.textStyle = .bodyLarge
    }
    
    open var closeButtonText: String = "Close" { didSet { updateView() }}
    
    open lazy var closeButton: UIButton = {
        let button = UIButton(type: .system)
        button.backgroundColor = .clear
        button.setTitle("Close", for: .normal)
        button.titleLabel?.font = TextStyle.bodyLarge.font
        button.translatesAutoresizingMaskIntoConstraints = false
        return button
    }()
        
    //--------------------------------------------------
    // MARK: - Configuration
    //--------------------------------------------------
    private let containerViewBackgroundColorConfiguration = SurfaceColorConfiguration().with { instance in
        instance.lightColor = .white
        instance.darkColor = .black
    }

    private let backgroundColorConfiguration = SurfaceColorConfiguration(VDSColor.backgroundPrimaryDark, VDSColor.backgroundPrimaryLight)
    
    private let closeButtonTextColorConfiguration = SurfaceColorConfiguration(VDSColor.elementsPrimaryOnlight, VDSColor.elementsPrimaryOndark)

    private let containerViewInset = VDSLayout.Spacing.space4X.value
    private var containerBottomConstraint: NSLayoutConstraint?
    private var containerHeightConstraint: NSLayoutConstraint?
    private var contentStackViewBottomConstraint: NSLayoutConstraint?
    //--------------------------------------------------
    // MARK: - Lifecycle
    //--------------------------------------------------
    open override func viewDidLoad() {
        super.viewDidLoad()
        isModalInPresentation = true
        setup()
    }
    
    open func setup() {
        //left-right swipe
        view.publisher(for: UISwipeGestureRecognizer().with{ $0.direction = .right })
            .sink { [weak self] swipe in
            guard let self else { return }
            self.dismiss(animated: true, completion: nil)
        }.store(in: &subscribers)

        //tapping in background
        view.publisher(for: UITapGestureRecognizer().with{ $0.numberOfTapsRequired = 1 })
            .sink { [weak self] swipe in
            guard let self else { return }
            self.dismiss(animated: true, completion: nil)
        }.store(in: &subscribers)

        //clicking button
        onClickSubscriber = closeButton.publisher(for: .touchUpInside)
            .sink {[weak self] button in
            guard let self else { return }
            self.dismiss(animated: true, completion: nil)
        }

        contentStackView.addArrangedSubview(titleLabel)
        contentStackView.addArrangedSubview(contentLabel)
        scrollView.addSubview(contentStackView)
        modalView.addSubview(scrollView)
        modalView.addSubview(line)
        modalView.addSubview(closeButton)
        view.addSubview(modalView)

        // Activate constraints
        NSLayoutConstraint.activate([
            // Constraints for the floating modal view
            modalView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            modalView.centerYAnchor.constraint(equalTo: view.centerYAnchor),
            modalView.widthAnchor.constraint(equalToConstant: 296),
            modalView.heightAnchor.constraint(greaterThanOrEqualToConstant: 96),
            modalView.heightAnchor.constraint(lessThanOrEqualToConstant: 312),
           
            // Constraints for the scroll view
            scrollView.topAnchor.constraint(equalTo: modalView.topAnchor, constant: VDSLayout.Spacing.space4X.value),
            scrollView.leadingAnchor.constraint(equalTo: modalView.leadingAnchor),
            scrollView.trailingAnchor.constraint(equalTo: modalView.trailingAnchor),
            scrollView.bottomAnchor.constraint(equalTo: line.topAnchor),

            line.leadingAnchor.constraint(equalTo: modalView.leadingAnchor),
            line.trailingAnchor.constraint(equalTo: modalView.trailingAnchor),
        
            closeButton.topAnchor.constraint(equalTo: line.bottomAnchor),
            closeButton.leadingAnchor.constraint(equalTo: modalView.leadingAnchor),
            closeButton.trailingAnchor.constraint(equalTo: modalView.trailingAnchor),
            closeButton.bottomAnchor.constraint(equalTo: modalView.bottomAnchor),
            closeButton.heightAnchor.constraint(equalToConstant: 44.0),

            contentStackView.topAnchor.constraint(equalTo: scrollView.topAnchor),
            contentStackView.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor, constant: containerViewInset),
            contentStackView.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor, constant: -containerViewInset),
            contentStackView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor, constant: -containerViewInset),
            contentStackView.widthAnchor.constraint(equalTo: scrollView.widthAnchor, constant: -(containerViewInset * 2)),
            contentStackView.heightAnchor.constraint(greaterThanOrEqualTo: scrollView.heightAnchor, constant: -(containerViewInset * 2))

        ])
    }

    open func updateView() {
        view.backgroundColor = backgroundColorConfiguration.getColor(self).withAlphaComponent(0.3)
        modalView.backgroundColor = containerViewBackgroundColorConfiguration.getColor(self)
        scrollView.indicatorStyle = surface == .light ? .black : .white
        
        titleLabel.removeFromSuperview()
        contentLabel.removeFromSuperview()
        contentView?.removeFromSuperview()
        
        titleLabel.surface = surface
        contentLabel.surface = surface
        line.surface = surface
        
        titleLabel.text = titleText
        contentLabel.text = contentText
        
        titleLabel.sizeToFit()
        contentLabel.sizeToFit()
        
        var addedTitle = false
        
        if let titleText, !titleText.isEmpty {
            contentStackView.addArrangedSubview(titleLabel)
            addedTitle = true
        }
        
        var addedContent = false
        if let contentText, !contentText.isEmpty {
            contentStackView.addArrangedSubview(contentLabel)
            addedContent = true
        } else if let contentView {
            contentView.translatesAutoresizingMaskIntoConstraints = false
            if var surfaceable = contentView as? Surfaceable {
                surfaceable.surface = surface
            }
            let wrapper = View()
            wrapper.addSubview(contentView)
            contentView.pinTop()
            contentView.pinLeading()
            contentView.pinBottom()
            contentView.pinTrailingLessThanOrEqualTo()
            contentView.setNeedsLayout()
            contentStackView.addArrangedSubview(wrapper)
            addedContent = true
        }
        
        if addedTitle && addedContent {
            contentStackView.setCustomSpacing(VDSLayout.Spacing.space1X.value, after: titleLabel)
        }
        
        let closeButtonTextColor = closeButtonTextColorConfiguration.getColor(self)
        closeButton.setTitleColor(closeButtonTextColor, for: .normal)
        closeButton.setTitleColor(closeButtonTextColor, for: .highlighted)
        closeButton.setTitle(closeButtonText, for: .normal)
        
        scrollView.layoutIfNeeded()
                
    }
}