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

import Foundation
import UIKit
import VDSColorTokens
import VDSFormControlsTokens
import Combine

/// Badges are visual labels used to convey status or highlight supplemental information.
@objc(VDSBadge)
open class Badge: View {
    //--------------------------------------------------
    // MARK: - Enums
    //--------------------------------------------------
    public enum FillColor: String, CaseIterable {
        case red, yellow, green, orange, blue, black, white
    }
    
    //--------------------------------------------------
    // MARK: - Public Properties
    //--------------------------------------------------
    open var label = Label().with {
        $0.setContentCompressionResistancePriority(.required, for: .vertical)
        $0.adjustsFontSizeToFitWidth = false
        $0.lineBreakMode = .byTruncatingTail
        $0.textPosition = .left
        $0.textStyle = .boldBodySmall
    }
    
    open var fillColor: FillColor = .red { didSet { didChange() }}

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

    open var maxWidth: CGFloat? { didSet { didChange() }}
    
    open var numberOfLines: Int = 1 { didSet { didChange() }}
           
    //--------------------------------------------------
    // MARK: - Constraints
    //--------------------------------------------------
    private var maxWidthConstraint: NSLayoutConstraint?
    private var minWidthConstraint: NSLayoutConstraint?

    //--------------------------------------------------
    // MARK: - Lifecycle
    //--------------------------------------------------

    open override func setup() {
        super.setup()
        
        accessibilityElements = [label]
        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
        
    }
    
    open override func reset() {
        super.reset()
        label.reset()
        label.lineBreakMode = .byTruncatingTail
        label.textPosition = .left
        label.textStyle = .boldBodySmall
        
        fillColor = .red
        text = ""
        maxWidth = nil
        numberOfLines = 1
    }
    
    //--------------------------------------------------
    // MARK: - Configuration
    //--------------------------------------------------
    private var backgroundColorConfig: AnyColorable = {
        let config = KeyedColorConfiguration<Badge, FillColor>(keyPath: \.fillColor)
        config.setSurfaceColors(VDSColor.backgroundBrandhighlight, VDSColor.backgroundBrandhighlight, forKey: .red)
        config.setSurfaceColors(VDSColor.paletteYellow62, VDSColor.paletteYellow62, forKey: .yellow)
        config.setSurfaceColors(VDSColor.paletteGreen26, VDSColor.paletteGreen34, forKey: .green)
        config.setSurfaceColors(VDSColor.paletteOrange39, VDSColor.paletteOrange46, forKey: .orange)
        config.setSurfaceColors(VDSColor.paletteBlue35, VDSColor.paletteBlue45, forKey: .blue)
        config.setSurfaceColors(VDSColor.paletteBlack, VDSColor.paletteBlack, forKey: .black)
        config.setSurfaceColors(VDSColor.paletteWhite, VDSColor.paletteWhite, forKey: .white)
        return config.eraseToAnyColorable()
    }()
    
    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(self)

        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
        }
    }
}