//
//  TooltipLabelAttribute.swift
//  VDS
//
//  Created by Matt Bruce on 4/27/23.
//

import Foundation
import UIKit
import Combine
import VDSCoreTokens

public class TooltipLabelAttribute: ActionLabelAttributeModel, TooltipLaunchable {
    public var id = UUID()
    public var action = PassthroughSubject<Void, Never>()
    private var subscriber: AnyCancellable?
    private var size: Tooltip.Size = .small
    public var location: Int = 0
    public var length: Int = 3
    /// Current Surface and this is used to pass down to child objects that implement Surfacable
    public var surface: Surface = .light
    public var accessibleText: String? = "Tool Tip"
    public var model: Tooltip.TooltipModel
    public var presenter: UIView?

    public func setAttribute(on attributedString: NSMutableAttributedString) {
        //update the location
        location = attributedString.string.count - 1

        //set the default color off surface for text
        var imageTintColor: UIColor = surface == .light ? VDSColor.elementsPrimaryOnlight : VDSColor.elementsPrimaryOndark

        //see if you can get the current textColor
        var originalRange = NSMakeRange(0, attributedString.length)
        if let textColor = attributedString.attribute(.foregroundColor, at: 0, effectiveRange: &originalRange) as? UIColor {
            imageTintColor = textColor
        }

        var frame = CGRect.zero
        let ratio: Double = 1.0 //0.80
        let yPosition: Double = -3
        if let font = attributedString.attribute(.font, at: 0, effectiveRange: &originalRange) as? UIFont {
            switch font.pointSize {
            case 15..<25:
                size = .medium
                frame = CGRect(x: 0, y: yPosition, width: size.value.dimensions.width * ratio, height: size.value.dimensions.height * ratio)
            case 0..<14:
                size = .small
                frame = CGRect(x: 0, y: yPosition, width: size.value.dimensions.width * ratio , height: size.value.dimensions.height * ratio)
            default:
                size = .medium
                frame = CGRect(x: 0, y: yPosition, width: size.value.dimensions.width, height: size.value.dimensions.height)
            }
        }
               
        //create the image icon and match the color of the text
        let tooltipAttribute = ImageLabelAttribute(location: location,
                                                   imageName: "info",
                                                   frame:  frame,
                                                   tintColor: imageTintColor)
        
        let spacer = NSAttributedString.spacer(for: VDSLayout.space1X)
        
        guard let tooltip = try? tooltipAttribute.getAttachment() else { return }
        attributedString.append(spacer)
        attributedString.append(NSAttributedString(attachment: tooltip))
        addHandler(on: attributedString)
    }
    
    public init(id: UUID = UUID(),
                subscriber: AnyCancellable? = nil,
                accessibleText: String? = nil,
                surface: Surface = .light,
                model: Tooltip.TooltipModel,
                presenter: UIView? = nil) {
        self.id = id
        self.subscriber = subscriber
        self.surface = surface
        self.model = model
        self.accessibleText = accessibleText ?? model.accessibleText
        self.presenter = presenter
        
        //create the tooltip click event
        self.subscriber = action.sink { [weak self] in
            guard let self else { return }
            self.presentTooltip(surface: surface, tooltipModel: model, presenter: self.presenter)
        }
    }
    
    public static func == (lhs: TooltipLabelAttribute, rhs: TooltipLabelAttribute) -> Bool {
        lhs.isEqual(rhs)
    }
    
    public func isEqual(_ equatable: TooltipLabelAttribute) -> Bool {
        return id == equatable.id && range == equatable.range
    }
}