Sesame-iOS/Sesame/HistoryView.swift

import SwiftUI

struct HistoryView: View {

    let history: HistoryManagerProtocol

    @State
    private var items: [HistoryItem] = []

    @State
    private var unlockCount = 0

    private var percentage: Double {
        guard items.count > 0 else {
            return 0
        }
        return Double(unlockCount * 100) / Double(items.count)
    }

    var body: some View {
        NavigationView {
            List {
                HStack {
                    Text("\(items.count) requests")
                        .foregroundColor(.primary)
                        .font(.body)
                    Spacer()
                    Text(String(format: "%d successful (%.1f %%)", unlockCount, percentage))
                        .foregroundColor(.secondary)
                        .font(.footnote)
                }
                ForEach(items) {entry in
                    HistoryListItem(entry: entry)
                }
            }
            .navigationTitle("History")
        }
        .onAppear {
            load()
        }
    }

    private func load() {
        Task {
            let entries = history.loadEntries()
            DispatchQueue.main.async {
                items = entries
                unlockCount = items.count {
                    $0.response == .openSesame
                }
            }
        }
    }
}

struct HistoryView_Previews: PreviewProvider {
    static var previews: some View {
        HistoryView(history: HistoryManagerMock())
    }
}