import Foundation

/// Zustand des Solarladereglers.
struct SolarState: Equatable, Codable, Sendable {
    var batteryVoltage: Double?
    var pvVoltage: Double?
    var pvCurrent: Double?
    var pvPower: Double?
    var controllerTemperature: Double?

    var isBatteryCharging: Bool?
    var isBatteryDischarging: Bool?
    var isControllerActive: Bool?
    var isCurrentLimited: Bool?

    var hasReading: Bool {
        batteryVoltage != nil || pvVoltage != nil || pvCurrent != nil || pvPower != nil
    }

    /// Kurzer Klartext, wie bei den übrigen Geräten als "Zustand" angezeigt.
    var stateText: String? {
        guard isControllerActive != nil else { return nil }
        if isBatteryCharging == true { return "Lädt" }
        if isControllerActive == true { return "Aktiv" }
        return "Inaktiv"
    }

    func snapshot(deviceID: UUID, rssi: Int?) -> DeviceSnapshot {
        var snapshot = DeviceSnapshot(deviceID: deviceID, timestamp: Date(), rssi: rssi)
        snapshot.metrics = [
            Metric("pv_power", "Solarleistung", pvPower, unit: "W", precision: 0, primary: true),
            Metric("pv_voltage", "PV-Spannung", pvVoltage, unit: "V", precision: 1),
            Metric("pv_current", "PV-Strom", pvCurrent, unit: "A", precision: 1),
            Metric("battery_voltage", "Batteriespannung", batteryVoltage, unit: "V", precision: 2),
        ]
        if let controllerTemperature {
            snapshot.metrics.append(
                Metric("controller_temperature", "Reglertemperatur", controllerTemperature,
                      unit: "°C", precision: 0)
            )
        }
        snapshot.state = stateText
        if isCurrentLimited == true {
            snapshot.offReasons = ["PV-Strombegrenzung aktiv"]
        }
        return snapshot
    }
}