//
//  NavigationBar.swift
//  Gemini-iOS
//
//  Created by Shadowfacts on 9/28/20.
//

import SwiftUI
import BrowserCore

struct NavigationBar: View {
    @ObservedObject var navigator: NavigationManager
    @State private var urlFieldContents: String
    
    @Environment(\.colorScheme) var colorScheme: ColorScheme
    
    init(navigator: NavigationManager) {
        self.navigator = navigator
        self._urlFieldContents = State(initialValue: navigator.currentURL.absoluteString)
    }
    
    var body: some View {
        VStack(spacing: 0) {
            TextField("URL", text: $urlFieldContents, onCommit: commitURL)
                .keyboardType(.URL)
                .autocapitalization(.none)
                .disableAutocorrection(true)
                .textFieldStyle(RoundedBorderTextFieldStyle())
                .padding([.leading, .trailing, .bottom])
            
            Rectangle()
                .frame(height: 1)
                .foregroundColor(Color(white: colorScheme == .dark ? 0.25 : 0.75))
        }
        .background(Color(UIColor.systemBackground).edgesIgnoringSafeArea(.top))
        .onReceive(navigator.$currentURL) { (newURL) in
            urlFieldContents = newURL.absoluteString
        }
    }
    
    private func commitURL() {
        guard let url = URL(string: urlFieldContents) else { return }
        navigator.changeURL(url)
    }
}

struct NavigationBar_Previews: PreviewProvider {
    static var previews: some View {
        NavigationBar(navigator: NavigationManager(url: URL(string: "gemini://localhost/overview.gmi")!))
    }
}