import SwiftUI
import SFSafeSymbols

private let df: DateFormatter = {
    let df = DateFormatter()
    df.locale = .current
    df.dateStyle = .short
    df.timeStyle = .short
    return df
}()

struct DeviceInfoView: View {
    
    private let storageWarnBytes = 500
    
    let info: DeviceInfo

    @Binding
    var isPresented: Bool
    
    private var runTimeString: String {
        let number = info.numberOfSecondsRunning
        guard number >= 60 else {
            return "\(number) seconds"
        }
        let minutes = number / 60
        guard minutes > 1 else {
            return "1 minute"
        }
        guard minutes >= 60 else {
            return "\(minutes) minutes"
        }
        let hours = minutes / 60
        guard hours > 1 else {
            return "1 hour"
        }
        guard hours >= 60 else {
            return "\(hours) hours"
        }
        let days = hours / 24
        guard days > 1 else {
            return "1 day"
        }
        return "\(days) days"
    }
    
    private var nextUpdateText: String {
        let secs = Int(info.nextMeasurement.timeIntervalSinceNow.rounded())
        guard secs > 1 else {
            return "Now"
        }
        return "In \(secs) seconds"
    }
    
    private var storageIcon: SFSymbol {
        if info.storageSize - info.numberOfRecordedBytes < storageWarnBytes {
            return .externaldriveTrianglebadgeExclamationmark
        }
        return .externaldrive
    }
    
    private var storageText: String {
        if info.storageSize <= 0 {
            return "\(info.numberOfRecordedBytes)"
        }
        return "\(info.numberOfRecordedBytes) / \(info.storageSize) Bytes (\(info.storageFillPercentage) %)"
    }
    
    func sensorView(_ sensor: TemperatureSensor?, id: Int) -> some View {
            VStack(alignment: .leading, spacing: 5) {
                Text("Sensor \(id)")
                    .font(.headline)
                if let sensor {
                    HStack {
                        Image(systemSymbol: sensor.temperatureIcon)
                            .frame(width: 30)
                        Text(sensor.temperatureText)
                    }
                    HStack {
                        Image(systemSymbol: .arrowTriangle2Circlepath)
                            .frame(width: 30)
                        Text(sensor.updateText)
                        Spacer()
                    }
                    HStack {
                        Image(systemSymbol: .tag)
                            .frame(width: 30)
                        Text(sensor.hexAddress)
                    }
                } else {
                    HStack {
                        Image(systemSymbol: .thermometerMediumSlash)
                            .frame(width: 30)
                        Text("Not connected")
                    }
                }
            }
    }
    
    var updateText: String {
        guard info.receivedDate.secondsToNow > 3 else {
            return "Updated Now"
        }
        return "Updated \(info.receivedDate.timePassedText)"
    }
    
    var clockOffsetText: String {
        guard info.hasDeviceStartTimeSet else {
            return "Clock not synchronized"
        }
        let offset = info.clockOffset.roundedInt
        guard abs(offset) > 1 else {
            return "No clock offset"
        }
        return "Offset: \(offset) seconds"
    }
    
    var body: some View {
        NavigationView {
            VStack(alignment: .leading, spacing: 5) {
                VStack(alignment: .leading, spacing: 5) {
                    Text("Recording")
                        .font(.headline)
                    HStack {
                        Image(systemSymbol: .power)
                            .frame(width: 30)
                        Text(df.string(from: info.deviceStartTime))
                        Spacer()
                    }
                    HStack {
                        Image(systemSymbol: .clock)
                            .frame(width: 30)
                        Text("\(runTimeString)")
                    }
                    HStack {
                        Image(systemSymbol: .clockBadgeExclamationmark)
                            .frame(width: 30)
                        Text(clockOffsetText)
                    }
                    HStack {
                        Image(systemSymbol: .stopwatch)
                            .frame(width: 30)
                        Text("Every \(info.measurementInterval) seconds")
                        Spacer()
                    }
                    HStack {
                        Image(systemSymbol: .arrowTriangle2Circlepath)
                            .frame(width: 30)
                        Text(nextUpdateText)
                        Spacer()
                    }
                }
                VStack(alignment: .leading, spacing: 5) {
                    Text("Storage")
                        .font(.headline)
                    HStack {
                        Image(systemSymbol: .speedometer)
                            .frame(width: 30)
                        Text("\(info.numberOfStoredMeasurements) Measurements (\(info.totalNumberOfMeasurements) total)")
                    }
                    HStack {
                        Image(systemSymbol: storageIcon)
                            .frame(width: 30)
                        Text(storageText)
                    }
                    HStack {
                        Image(systemSymbol: .iphoneAndArrowForward)
                            .frame(width: 30)
                        Text("\(info.transferBlockSize) Byte Block Size")
                    }
                }
                sensorView(info.sensor0, id: 0)
                sensorView(info.sensor1, id: 1)
                Spacer()
                HStack {
                    Spacer()
                    TimelineView(.periodic(from: Date(), by: 1)) { context in
                        Text(updateText)
                            .font(.footnote)
                            .textCase(.uppercase)
                    }
                    Spacer()
                }
            }
            .padding()
            .navigationTitle("Device Info")
            .navigationBarTitleDisplayMode(.large)
        }
    }
}

struct DeviceInfoView_Previews: PreviewProvider {
    static var previews: some View {
        DeviceInfoView(info: .mock, isPresented: .constant(true))
            .previewLayout(.fixed(width: 375, height: 650))
    }
}