import SwiftUI

struct SettingsView: View {

    @EnvironmentObject
    var database: Database

    @Binding
    var isPresented: Bool

    var body: some View {
        VStack(alignment: .leading, spacing: 3) {
            HStack {
                Text("Settings")
                    .font(.title2)
                    .bold()
                Spacer()
                Button(action: hide) {
                    Image(systemSymbol: .xmarkCircleFill)
                        .foregroundColor(.gray)
                        .font(.system(size: 26))
                }
            }
            Text("Statistics")
                .font(.footnote)
                .textCase(.uppercase)
                .foregroundColor(.secondary)
                .padding(.top)
            Group {
            SettingsStatisticRow(label: "Caps", value: "\(database.numberOfCaps)")
            SettingsStatisticRow(label: "Total images", value: "\(database.numberOfImages)")
            SettingsStatisticRow(label: "Images per cap", value: String(format: "%.1f", database.averageImageCount))
            }.padding(.horizontal)
            Text("Classifier")
                .font(.footnote)
                .textCase(.uppercase)
                .foregroundColor(.secondary)
                .padding(.top)
            Group {
                SettingsStatisticRow(label: "Version", value: "\(database.classifierVersion)")
                SettingsStatisticRow(label: "Recognized caps", value: "\(database.classifierClassCount)")
            }.padding(.horizontal)
            Text("Storage")
                .font(.footnote)
                .textCase(.uppercase)
                .foregroundColor(.secondary)
                .padding(.top)
            Group {
                SettingsStatisticRow(label: "Image cache", value: byteString(database.imageCacheSize))
                SettingsStatisticRow(label: "Database", value: byteString(database.databaseSize))
                SettingsStatisticRow(label: "Classifier", value: byteString(database.classifierSize))
            }.padding(.horizontal)

            Spacer()
        }
        .padding(.horizontal)
    }

    private func hide() {
        isPresented = false
    }

    private func byteString(_ count: Int) -> String {
        ByteCountFormatter.string(fromByteCount: Int64(count), countStyle: .file)
    }
}

struct SettingsView_Previews: PreviewProvider {
    static var previews: some View {
        SettingsView(isPresented: .constant(true))
            .environmentObject(Database.mock)
            .previewLayout(.fixed(width: 375, height: 330))
    }
}