//
//  Extensions.swift
//  
//
//  Created by Thibaut Schmitt on 13/12/2021.
//

import Foundation

// MARK: - String

public extension String {
    func removeCharacters(from forbiddenChars: CharacterSet) -> String {
        let passed = self.unicodeScalars.filter { !forbiddenChars.contains($0) }
        return String(String.UnicodeScalarView(passed))
    }
    
    func removeCharacters(from: String) -> String {
        return removeCharacters(from: CharacterSet(charactersIn: from))
    }
    
    func removeTrailingWhitespace() -> String {
        var newString = self
        
        while newString.last?.isWhitespace == true {
            newString = String(newString.dropLast())
        }
        
        return newString
    }
    
    func colorComponent()  -> (alpha: String, red: String, green: String, blue: String) {
        var alpha: String = "FF"
        var red: String
        var green: String
        var blue: String

        var colorClean = self
                .replacingOccurrences(of: "#", with: "")
                .replacingOccurrences(of: "0x", with: "")

        if colorClean.count == 8 {
            alpha = String(colorClean.prefix(2))
            colorClean = String(colorClean.dropFirst(2))
        }
        
        red = String(colorClean.prefix(2))
        colorClean = String(colorClean.dropFirst(2))
        green = String(colorClean.prefix(2))
        colorClean = String(colorClean.dropFirst(2))
        blue = String(colorClean.prefix(2))
        return (alpha: alpha, red: red, green: green, blue: blue)
    }
}

// MARK: - Sequence

extension Sequence where Iterator.Element: Hashable {
    public func unique() -> [Iterator.Element] {
        var seen: [Iterator.Element: Bool] = [:]
        return self.filter { seen.updateValue(true, forKey: $0) == nil }
    }
}