//
//  Badge.swift
//  VDS
//
//  Created by Matt Bruce on 9/22/22.
//

import Foundation
import UIKit
import VDSColorTokens
import VDSFormControlsTokens
import Combine

public enum BadgeFillColor: String, Codable, CaseIterable {
    case red, yellow, green, orange, blue, black, white
}


/// Badges are visual labels used to convey status or highlight supplemental information.
@objc(VDSBadge)
public class Badge: View, Accessable {
    
    private var label = Label().with {
        $0.setContentCompressionResistancePriority(.required, for: .vertical)
        $0.adjustsFontSizeToFitWidth = false
        $0.lineBreakMode = .byTruncatingTail
        $0.textPosition = .left
        $0.typograpicalStyle = .BoldBodySmall
    }
    
    //--------------------------------------------------
    // MARK: - Public Properties
    //--------------------------------------------------
    open var fillColor: BadgeFillColor = .red { didSet { didChange() }}

    open var text: String = "" { didSet { didChange() }}

    open var maxWidth: CGFloat? { didSet { didChange() }}
    
    open var numberOfLines: Int = 1 { didSet { didChange() }}

    open var accessibilityHintEnabled: String? { didSet { didChange() }}
    
    open var accessibilityHintDisabled: String? { didSet { didChange() }}
    
    open var accessibilityValueEnabled: String? { didSet { didChange() }}
    
    open var accessibilityValueDisabled: String? { didSet { didChange() }}
    
    open var accessibilityLabelEnabled: String? { didSet { didChange() }}
    
    open var accessibilityLabelDisabled: String? { didSet { didChange() }}
           
    //--------------------------------------------------
    // MARK: - Constraints
    //--------------------------------------------------
    private var maxWidthConstraint: NSLayoutConstraint?
    private var minWidthConstraint: NSLayoutConstraint?

    //functions
    //--------------------------------------------------
    // MARK: - Lifecycle
    //--------------------------------------------------
  
    open override func setup() {
        super.setup()
        
        isAccessibilityElement = true
        accessibilityTraits = .staticText
        layer.cornerRadius = VDSFormControls.borderradius

        addSubview(label)
        label.pinToSuperView(.init(top: 2, left: 4, bottom: 2, right: 4))
        
        maxWidthConstraint = label.widthAnchor.constraint(lessThanOrEqualToConstant: 100)
        minWidthConstraint = label.widthAnchor.constraint(greaterThanOrEqualToConstant: 23)
        minWidthConstraint?.isActive = true
        
    }
    
    public override func reset() {
        super.reset()
        label.reset()
        label.lineBreakMode = .byTruncatingTail
        label.textPosition = .left
        label.typograpicalStyle = .BoldBodySmall
        
        fillColor = .red
        text = ""
        maxWidth = nil
        numberOfLines = 1
        accessibilityHintEnabled = nil
        accessibilityHintDisabled = nil
        accessibilityValueEnabled = nil
        accessibilityValueDisabled = nil
        accessibilityLabelEnabled = nil
        accessibilityLabelDisabled = nil

        setAccessibilityLabel()
    }
    
    //--------------------------------------------------
    // MARK: - Configuration
    //--------------------------------------------------
    private var backgroundColorConfig: StateColorConfiguration<BadgeFillColor> = {
        let config = StateColorConfiguration<BadgeFillColor>()
        config.setSurfaceColors(VDSColor.backgroundBrandhighlight, VDSColor.backgroundBrandhighlight, forState: .red)
        config.setSurfaceColors(VDSColor.paletteYellow62, VDSColor.paletteYellow62, forState: .yellow)
        config.setSurfaceColors(VDSColor.paletteGreen26, VDSColor.paletteGreen34, forState: .green)
        config.setSurfaceColors(VDSColor.paletteOrange39, VDSColor.paletteOrange46, forState: .orange)
        config.setSurfaceColors(VDSColor.paletteBlue35, VDSColor.paletteBlue45, forState: .blue)
        config.setSurfaceColors(VDSColor.paletteBlack, VDSColor.paletteBlack, forState: .black)
        config.setSurfaceColors(VDSColor.paletteWhite, VDSColor.paletteWhite, forState: .white)
        return config
    }()
    
    private var textColorConfig = ViewColorConfiguration()
    
    public func updateTextColorConfig() {
        textColorConfig.reset()
        
        switch fillColor {
            
        case .red, .black:
            textColorConfig.setSurfaceColors(VDSColor.elementsPrimaryOndark, VDSColor.elementsPrimaryOndark, forDisabled: false)
            textColorConfig.setSurfaceColors(VDSColor.elementsPrimaryOndark, VDSColor.elementsPrimaryOndark, forDisabled: true)
            
        case .yellow, .white:
            textColorConfig.setSurfaceColors(VDSColor.elementsPrimaryOnlight, VDSColor.elementsPrimaryOnlight, forDisabled: false)
            textColorConfig.setSurfaceColors(VDSColor.elementsPrimaryOnlight, VDSColor.elementsPrimaryOnlight, forDisabled: true)
            
        case .orange, .green, .blue:
            textColorConfig.setSurfaceColors(VDSColor.elementsPrimaryOndark, VDSColor.elementsPrimaryOnlight, forDisabled: false)
            textColorConfig.setSurfaceColors(VDSColor.elementsPrimaryOndark, VDSColor.elementsPrimaryOnlight, forDisabled: true)
        }
    }
    
    //--------------------------------------------------
    // MARK: - State
    //--------------------------------------------------
    open override func updateView() {
        updateTextColorConfig()
        
        backgroundColor = backgroundColorConfig.getColor(surface, forState: fillColor)

        label.textColorConfiguration = textColorConfig.eraseToAnyColorable()
        label.numberOfLines = numberOfLines
        label.text = text
        label.surface = surface
        label.disabled = disabled
        
        if let maxWidth = maxWidth, let minWidth = minWidthConstraint?.constant, maxWidth > minWidth  {
            maxWidthConstraint?.constant = maxWidth
            maxWidthConstraint?.isActive = true
        } else {
            maxWidthConstraint?.isActive = false
        }
        
        setAccessibilityLabel()
    }
    
}