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

import SwiftUI
import BrowserCore

struct ToolBar: View {
    @ObservedObject var navigator: NavigationManager
    let shareCurrentURL: () -> Void
    @State private var showPreferencesSheet = false
    
    @Environment(\.colorScheme) var colorScheme: ColorScheme
    
    var body: some View {
        VStack(spacing: 4) {
            Rectangle()
                .frame(height: 1)
                .foregroundColor(Color(white: colorScheme == .dark ? 0.25 : 0.75))
            
            HStack {
                // use a group because this exceeds the 10 view limit :/
                Group {
                    Spacer()
                    
                    Button(action: navigator.back) {
                        Image(systemName: "arrow.left")
                            .font(.system(size: 24))
                    }
                    .accessibility(label: Text("Back"))
                    .hoverEffect(.highlight)
                    .contextMenu {
                        ForEach(Array(navigator.backStack.suffix(5).enumerated()), id: \.1) { (index, url) in
                            Button {
                                navigator.back(count: min(5, navigator.backStack.count) - index)
                            } label: {
                                Text(verbatim: urlForDisplay(url))
                            }
                        }
                    }
                    .disabled(navigator.backStack.isEmpty)
                    
                    Spacer()
                    
                    Button(action: navigator.forward) {
                        Image(systemName: "arrow.right")
                            .font(.system(size: 24))
                    }
                    .accessibility(label: Text("Forward"))
                    .hoverEffect(.highlight)
                    .contextMenu {
                        ForEach(navigator.forwardStack.prefix(5).enumerated().reversed(), id: \.1) { (index, url) in
                            Button {
                                navigator.forward(count: index + 1)
                            } label: {
                                Text(verbatim: urlForDisplay(url))
                            }
                        }
                    }
                    .disabled(navigator.forwardStack.isEmpty)
                    
                    Spacer()
                    
                    Button(action: navigator.reload) {
                        Image(systemName: "arrow.clockwise")
                            .font(.system(size: 24))
                    }
                    .accessibility(label: Text("Reload"))
                    .hoverEffect(.highlight)
                    
                    Spacer()
                    
                    Button(action: shareCurrentURL) {
                        Image(systemName: "square.and.arrow.up")
                            .font(.system(size: 24))
                    }
                    .accessibility(label: Text("Share"))
                    .hoverEffect(.highlight)
                    
                    Spacer()
                    
                    Button(action: {
                        showPreferencesSheet = true
                    }, label: {
                        Image(systemName: "gear")
                            .font(.system(size: 24))
                    })
                    .accessibility(label: Text("Preferences"))
                    .hoverEffect(.highlight)
                }
                
                Spacer()
            }
            
        }
        .padding(.bottom, 4)
        .background(Color(UIColor.systemBackground).edgesIgnoringSafeArea(.bottom))
        .sheet(isPresented: $showPreferencesSheet, content: {
            PreferencesView(presented: $showPreferencesSheet)
        })
    }
    
    private func urlForDisplay(_ url: URL) -> String {
        var str = url.host!
        if let port = url.port,
           url.scheme != "gemini" || port != 1965 {
            str += ":\(port)"
        }
        str += url.path
        return str
    }
}

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