//
//  ContentView.swift
//  Button
//
//  Created by Sungwook Baek on 2023/09/26.
//

import SwiftUI
import Highlight

struct ContentView: View {
    @State var jsonString = NSMutableAttributedString(string: "")
    var body: some View {
        HighlightTextView(text: $jsonString)
    }
}

#Preview {
    ContentView()
}

struct HighlightTextView: UIViewRepresentable {
    @Binding var text: NSMutableAttributedString
    
    func makeUIView(context: Context) -> UITextView {
        let textView = UITextView()
        textView.keyboardType = .asciiCapable
        textView.autocapitalizationType = .none
        textView.delegate = context.coordinator
        textView.attributedText = text
        return textView
    }

    func updateUIView(_ uiView: UITextView, context: Context) {
        let selectedRange = uiView.selectedRange
        uiView.attributedText = text
        uiView.selectedRange = selectedRange
    }
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }
        
    class Coordinator: NSObject, UITextViewDelegate {
        var parent: HighlightTextView
        
        init(_ parent: HighlightTextView) {
            self.parent = parent
        }
        
        func textViewDidChange(_ textView: UITextView) {
            let highligher = JsonSyntaxHighlightProvider.shared.highlight( textView.attributedText.string, as: .json)
            let selectedRange = textView.selectedRange
            textView.attributedText = highligher
            textView.selectedRange = selectedRange
        }
    }
}