71 lines
2.0 KiB
Swift
71 lines
2.0 KiB
Swift
import Foundation
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struct DeviceTime {
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let date: Date
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let secondsSincePowerOn: Int
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let totalNumberOfMeasurements: Int
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let secondsUntilNextMeasurement: Int
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var nextMeasurement: Date {
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date.adding(seconds: secondsUntilNextMeasurement)
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}
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var deviceStartTime: Date {
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date.adding(seconds: -secondsSincePowerOn)
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}
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var estimatedMeasurementInterval: TimeInterval {
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guard totalNumberOfMeasurements > 0 else {
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return 60
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}
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return Double(secondsSincePowerOn + secondsUntilNextMeasurement) / Double(totalNumberOfMeasurements)
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}
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func measurementStartTime(measurementInterval interval: TimeInterval) -> Date {
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nextMeasurement.addingTimeInterval(-Double(totalNumberOfMeasurements) * interval)
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}
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func measurementOffset(measurementInterval interval: TimeInterval) -> TimeInterval {
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measurementStartTime(measurementInterval: interval).timeIntervalSince(deviceStartTime)
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}
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}
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extension DeviceTime: Equatable {
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}
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extension DeviceTime: Codable {
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init(from decoder: Decoder) throws {
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var container = try decoder.unkeyedContainer()
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let time = try container.decode(Double.self)
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self.date = .init(timeIntervalSince1970: time)
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self.secondsSincePowerOn = try container.decode(Int.self)
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self.totalNumberOfMeasurements = try container.decode(Int.self)
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self.secondsUntilNextMeasurement = try container.decode(Int.self)
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}
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func encode(to encoder: Encoder) throws {
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var container = encoder.unkeyedContainer()
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try container.encode(date.timeIntervalSince1970)
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try container.encode(secondsSincePowerOn)
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try container.encode(totalNumberOfMeasurements)
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try container.encode(secondsUntilNextMeasurement)
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}
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}
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extension DeviceTime {
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static var mock: DeviceTime {
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.init(
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date: .now,
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secondsSincePowerOn: 125,
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totalNumberOfMeasurements: 3,
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secondsUntilNextMeasurement: 55)
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}
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}
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