import SwiftUI

struct HomeView: View {

    @Environment(\.scenePhase)
    private var scenePhase

    @EnvironmentObject
    private var viewModel: ViewModel

    private let falsePositiveURL = URL(string: "https://www.sr2.uk/contact")!
    private let statusURL = URL(string:
        "https://status.sr2.uk/")!
    private let tosURL = URL(string: "https://www.sr2.uk/terms")!
    private let privacyPolicyURL = URL(string: "https://www.sr2.uk/privacy")!

    var body: some View {
        NavigationCompat {
            List {
                
                // Main toggle section
                Section {
                    HStack {
                        VStack(alignment: .leading, spacing: 4) {
                            Text(NSLocalizedString("DNS Protection", comment: ""))
                                .font(.headline)
                            Text(viewModel.isDnsEnabled ? NSLocalizedString("Active", comment: "") : NSLocalizedString("Inactive", comment: ""))
                                .font(.caption)
                                .foregroundStyle(viewModel.isDnsEnabled ? .green : .secondary)
                        }

                        Spacer()

                        Toggle("", isOn: $viewModel.isDnsEnabled)
                            .labelsHidden()
                            .disabled(true)
                            .tint(.green)
                    }
                    .padding(.vertical, 4)
                }

                if !viewModel.isDnsEnabled {
                    Section {
                        VStack(alignment: .leading, spacing: 4) {
                            Text(String(format: NSLocalizedString("To enable %@:", comment: ""), ViewModel.title))
                            Text(String(format: NSLocalizedString("%1$@ Tap \"%2$@\"", comment: ""), "–", NSLocalizedString("Open Settings", comment: "")))
                            Text(String(format: NSLocalizedString("%1$@ Go to General", comment: ""), "–"))
                            Text(String(format: NSLocalizedString("%1$@ VPN & Network", comment: ""), "–"))
                            Text(String(format: NSLocalizedString("%1$@ DNS", comment: ""), "–"))
                            Text(String(format: NSLocalizedString("%1$@ Select \"%2$@\"", comment: ""), "–", viewModel.blocklist.title))

                            Spacer()

                            Button {
                                if let url = URL(string: UIApplication.openSettingsURLString) {
                                    UIApplication.shared.open(url)
                                }
                            } label: {
                                Text(NSLocalizedString("Open Settings", comment: ""))
                                    .frame(maxWidth: .infinity, minHeight: 32)
                            }
                            .buttonStyle(.borderedProminent)
                        }
                    }
                }

                // Blocklist selection
                Section {
                    ForEach(BlocklistOption.allCases) { option in
                        BlocklistRow(
                            option: option,
                            isSelected: viewModel.blocklist == option
                        )
                        .contentShape(Rectangle())
                        .onTapGesture {
                            guard option.enabled else { return }
                            withAnimation(.spring(duration: 0.3)) {
                                viewModel.blocklist = option
                            }
                        }
                        .opacity(option.enabled ? 1 : 0.6)
                    }
                } header: {
                    Text(NSLocalizedString("Blocklist", comment: ""))
                } footer: {
                    Text(NSLocalizedString("Select the level of protection for your DNS queries", comment: ""))
                }

                // Status section
                if viewModel.isDnsEnabled {
                    Section {
                        HStack {
                            Label(NSLocalizedString("Status", comment: ""), systemImage: "checkmark.circle.fill")
                                .foregroundStyle(.green)
                            Spacer()
                            Text(NSLocalizedString("Connected", comment: ""))
                                .foregroundStyle(.secondary)
                        }

                        HStack {
                            Label(NSLocalizedString("Server", comment: ""), systemImage: "server.rack")
                            Spacer()
                            Text(viewModel.blocklist.server)
                                .foregroundStyle(.secondary)
                                .font(.system(.body, design: .monospaced))
                        }
                        
                        HStack {
                            Label("IPv4", systemImage: "globe")
                            Spacer()
                            Text(viewModel.blocklist.ipv4)
                                .foregroundStyle(.secondary)
                                .font(.system(.body, design: .monospaced))
                        }
                        
                        HStack {
                            Label("IPv6", systemImage: "globe")
                            Spacer()
                            Text(viewModel.blocklist.ipv6)
                                .foregroundStyle(.secondary)
                                .font(.system(.body, design: .monospaced))
                        }

                        HStack {
                            Label(NSLocalizedString("Domains in blocklist", comment: ""), systemImage: "xmark.shield.fill")
                            Spacer()
                            BlockedCount()
                                .foregroundStyle(.secondary)
                        }
                    } header: {
                        Text(NSLocalizedString("Connection Details", comment: ""))
                    }
                }

                // Support section
                Section {
                    Link(destination: falsePositiveURL) {
                        HStack {
                            Label {
                                Text(NSLocalizedString("Report False Positive", comment: ""))
                            } icon: {
                                Image(systemName: "exclamationmark.bubble")
                                    .foregroundStyle(.orange)
                            }

                            Spacer()

                            Image(systemName: "arrow.up.right.square")
                                .font(.caption)
                                .foregroundStyle(.secondary)
                        }
                    }.foregroundStyle(.primary)
                } footer: {
                    Text(NSLocalizedString("Submit incorrectly blocked domains for review", comment: ""))
                }
                
                // Service status section
                Section {
                    Link(destination: statusURL) {
                        HStack(spacing: 12) {
                            Circle()
                                .fill(viewModel.summaryStatus.color)
                                .frame(width: 12, height: 12)
                            
                            VStack(alignment: .leading, spacing: 4) {
                                Text(NSLocalizedString("Service Status", comment: ""))
                                    .font(.headline)
                                Text(viewModel.summaryStatus.description)
                                    .font(.caption)
                                    .foregroundStyle(.secondary)
                            }
                            
                            Spacer()
                            
                            Image(systemName: "arrow.up.right.square")
                                .font(.caption)
                                .foregroundStyle(.secondary)
                        }
                        .padding(.vertical, 4)
                    }.foregroundStyle(.primary)

                    Link(destination: tosURL) {
                        HStack(spacing: 12) {
                            Image(systemName: "doc.text")
                            Text(NSLocalizedString("Terms of Service", comment: ""))
                            Spacer()
                            Image(systemName: "arrow.up.right.square")
                                .font(.caption)
                                .foregroundStyle(.secondary)
                            
                        }
                    }.foregroundStyle(.primary)
                    
                    Link(destination: privacyPolicyURL) {
                        HStack(spacing: 12) {
                            Image(systemName: "doc.text")
                            Text(NSLocalizedString("Privacy Policy", comment: ""))
                            Spacer()
                            Image(systemName: "arrow.up.right.square")
                                .font(.caption)
                                .foregroundStyle(.secondary)
                            
                        }
                    }.foregroundStyle(.primary)
                }
            }
            .navigationTitle(ViewModel.title)
            .animation(.default, value: viewModel.isDnsEnabled)
            .onChange(of: scenePhase) { newPhase in
                if newPhase == .active {
                    Task {
                        await viewModel.refreshConfig()
                    }
                }
            }
        }
    }
}

#Preview {
    HomeView()
        .environmentObject(ViewModel())
}