//
//  LabelAttributeUnderline.swift
//  VDS
//
//  Created by Matt Bruce on 8/3/22.
//

import Foundation
import UIKit

public struct UnderlineLabelAttribute: LabelAttributeModel {

    public func isEqual(_ equatable: UnderlineLabelAttribute) -> Bool {
        return id == equatable.id
        && range == equatable.range
        && color == equatable.color
        && style == equatable.style
        && pattern == equatable.pattern
    }
    
    public var id = UUID()
    public var location: Int
    public var length: Int
    public var color: UIColor?
    public var style: UnderlineStyle = .single
    public var pattern: UnderlineStyle.Pattern?
    
    public var underlineValue: NSUnderlineStyle {
        if let pattern = pattern?.value() {
            return NSUnderlineStyle(rawValue: style.value() | pattern)
        } else {
            return NSUnderlineStyle(rawValue: style.value())
        }
    }
    
    public init(location: Int, length: Int, style: UnderlineStyle = .single, color: UIColor? = nil, pattern: UnderlineStyle.Pattern? = nil) {
        self.location = location
        self.length = length
        self.color = color
        self.style = style
        self.pattern = pattern
    }
    
    public func setAttribute(on attributedString: NSMutableAttributedString) {
        attributedString.addAttribute(.underlineStyle, value: underlineValue.rawValue, range: range)
        if let color = color {
            attributedString.addAttribute(.underlineColor, value: color, range: range)
        }
    }
}

public enum UnderlineStyle: String, Codable {
    case none
    case single
    case thick
    case double
    
    func value() -> Int {
        switch self {
        case .none:
            return 0
            
        case .single:
            return NSUnderlineStyle.single.rawValue
            
        case .thick:
            return NSUnderlineStyle.thick.rawValue
            
        case .double:
            return NSUnderlineStyle.double.rawValue
        }
    }
    
    public enum Pattern: String, Codable {
        case dot
        case dash
        case dashDot
        case dashDotDot
        case byWord
        
        func value() -> Int {
            switch self {
            case .dot:
                return NSUnderlineStyle.patternDot.rawValue
                
            case .dash:
                return NSUnderlineStyle.patternDash.rawValue
                
            case .dashDot:
                return NSUnderlineStyle.patternDashDot.rawValue
                
            case .dashDotDot:
                return NSUnderlineStyle.patternDashDotDot.rawValue
                
            case .byWord:
                return NSUnderlineStyle.byWord.rawValue
            }
        }
    }
}