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

import Foundation
import UIKit
import Combine
import VDSColorTokens

public class TooltipLabelAttribute: ActionLabelAttributeModel, TooltipLaunchable {
    public var id = UUID()
    public var action = PassthroughSubject<Void, Never>()
    private var subscriber: AnyCancellable?
    public var location: Int = 0
    public var length: Int = 3
    public var surface: Surface = .light
    public var accessibleText: String? = "Tool Tip"
    public var closeButtonText: String = "Close"
    public var size: Tooltip.Size = .medium
    public var title: String
    public var content: String

    public func setAttribute(on attributedString: NSMutableAttributedString) {
        //update the location
        location = attributedString.string.count
        
        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
        }
        
        //create the space in the attirbuted String for the tooltip image and click action
        let spaceForTooltip = String(repeating: " ", count: length)
        
        //find the middle of the space
        let middle = (length/2)

        //add the space to the attributed string
        attributedString.insert(NSAttributedString(string: spaceForTooltip), at: location)
        
        //create the frame in which to hold the icon
        let frame = CGRect(x: 0, y: 0, width: size.dimensions.width, height: size.dimensions.width)
        
        //create the image icon and match the color of the text
        let tooltipAttribute = ImageLabelAttribute(location: location + middle,
                                                   length: 1,
                                                   imageName: "info",
                                                   frame:  frame,
                                                   tintColor: imageTintColor)
        
        //create the action for the tooltip click
        let tooltipAction = ActionLabelAttribute(location: location - middle,
                                                 length: length + middle,
                                                 shouldUnderline: false,
                                                 action: action)
        
        //apply the attribtes to the current attributedString
        tooltipAttribute.setAttribute(on: attributedString)
        tooltipAction.setAttribute(on: attributedString)
    }
  
    public init(id: UUID = UUID(), action: PassthroughSubject<Void, Never> = PassthroughSubject<Void, Never>(), subscriber: AnyCancellable? = nil, surface: Surface, accessibleText: String? = nil, closeButtonText: String, size: Tooltip.Size, title: String, content: String) {
        self.id = id
        self.action = action
        self.subscriber = subscriber
        self.surface = surface
        self.accessibleText = accessibleText
        self.closeButtonText = closeButtonText
        self.size = size
        self.title = title
        self.content = content
        
        //create the tooltip click event
        self.subscriber = action.sink { [weak self] in
            guard let self else { return }
            self.presentTooltip(surface: self.surface,
                                title: self.title,
                                content: self.content,
                                closeButtonText: self.closeButtonText)
        }
    }
    
    public static func == (lhs: TooltipLabelAttribute, rhs: TooltipLabelAttribute) -> Bool {
        lhs.isEqual(rhs)
    }
    
    public func isEqual(_ equatable: TooltipLabelAttribute) -> Bool {
        return id == equatable.id && range == equatable.range
    }
}