import SwiftUI

struct HistoryView: View {

    @ObservedObject
    var history: HistoryManager

    private var unlockCount: Int {
        history.entries.count {
            $0.response == .openSesame
        }
    }

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

    var body: some View {
        NavigationView {
            List {
                HStack {
                    VStack(alignment: .leading) {
                        Text("\(history.entries.count) requests")
                            .foregroundColor(.primary)
                            .font(.body)
                        Text(String(format: "%.1f %% success", percentage))
                            .foregroundColor(.secondary)
                            .font(.footnote)
                    }
                    Spacer()
                }
                .listRowBackground(Color.clear)

                ForEach(history.entries) { item in
                    NavigationLink {
                        HistoryItemDetail(item: item, history: history)
                    } label: {
                        HistoryListRow(item: item)
                    }
                    .swipeActions(edge: .trailing) {
                        Button {
                            delete(item: item)
                        } label: {
                            Label("Delete", systemSymbol: .trash)
                        }.tint(.red)
                    }
                }
            }
            .navigationTitle("History")
        }
    }

    private func delete(item: HistoryItem) {
        guard history.delete(item: item) else {
            return
        }
    }
}

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