//
//  Typography+Additional.swift
//  VDS
//
//  Created by Matt Bruce on 7/21/23.
//

import Foundation
import UIKit
import VDSCoreTokens

//MARK: Alignments
extension TextStyle {
    
    /// Alignments Available for the TextStyle
    public var aligments: [TextAlignment] {
        return [.left, .center]
    }
}

//MARK: Fonts
extension TextStyle {
    
    /// Font for the TextStyle.
    public var font: UIFont {
        return fontFace.font(ofSize: pointSize)
    }
}

//MARK: Style Helper
extension TextStyle {
    
    /// Default style used if no style is given.
    public static var defaultStyle: TextStyle { return bodyLarge }

    
    /// Find a TextStyle based off a Name.
    /// - Parameter name: Name of the TextStyle you want to find.
    /// - Returns: TextStyle for the given name.
    public static func textStyle(for name: String) -> TextStyle? {
        guard let style = TextStyle.allCases.first(where: {$0.rawValue == name }) else { return nil }
        return style
    }
    
    /// Returns a TextStyle based off a Font-Name and Size
    /// - Parameters:
    ///   - fontName: Name of the font you want to find.
    ///   - size: PointSize of the Font you want to find.
    /// - Returns: The exact TextStyle based on the FontName and Point Size.
    public static func style(for fontName: String, size: CGFloat) -> TextStyle? {
        //filter all styles by fontName
        let styles = allCases.filter{$0.fontFace.fontName == fontName }.sorted { lhs, rhs in lhs.pointSize < rhs.pointSize }
        
        //if there are no styles then return nil
        guard styles.count > 0 else { return nil }
        
        //if there is an exact match on a style with this pointSize then return it
        if let style = styles.first(where: {$0.pointSize == size }) {
            return style
            
        } else if let largerIndex = styles.firstIndex(where: { $0.pointSize > size}) { //find the closet one to pointSize
          return styles[max(largerIndex - 1, 0)]
            
        } else { //return the last style
            return styles.last!
        }
    }
}

extension TextStyle: CustomDebugStringConvertible {
    
    /// Used for showing the TextStyle Properties.
    public var debugDescription: String {
        "Name: \(self.rawValue) FontFace: \(font.fontName) FontWeight: \(self.rawValue.hasPrefix("bold") ? "bold" : "normal") PointSize: \(font.pointSize) LetterSpacing: \(letterSpacing) LineHeight: \(lineHeight)"
    }
}