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package org.terst.nav
import android.content.Context
import java.util.Locale
enum class TempUnit { CELSIUS, FAHRENHEIT }
enum class DepthUnit { FEET, METERS }
enum class PressureUnit { HPA, INHG }
enum class SpeedUnit { KNOTS, MPH, KPH }
enum class DistanceUnit { NM, KM, MI }
/**
* Persists and applies the user's preferred display units.
* Defaults: Fahrenheit, feet, hPa, knots.
*/
class UnitPrefs(context: Context) {
private val prefs = context.getSharedPreferences("unit_prefs", Context.MODE_PRIVATE)
var tempUnit: TempUnit
get() = runCatching { TempUnit.valueOf(prefs.getString(KEY_TEMP, null) ?: "") }.getOrDefault(TempUnit.FAHRENHEIT)
set(v) { prefs.edit().putString(KEY_TEMP, v.name).apply() }
var depthUnit: DepthUnit
get() = runCatching { DepthUnit.valueOf(prefs.getString(KEY_DEPTH, null) ?: "") }.getOrDefault(DepthUnit.FEET)
set(v) { prefs.edit().putString(KEY_DEPTH, v.name).apply() }
var pressureUnit: PressureUnit
get() = runCatching { PressureUnit.valueOf(prefs.getString(KEY_PRESSURE, null) ?: "") }.getOrDefault(PressureUnit.HPA)
set(v) { prefs.edit().putString(KEY_PRESSURE, v.name).apply() }
var speedUnit: SpeedUnit
get() = runCatching { SpeedUnit.valueOf(prefs.getString(KEY_SPEED, null) ?: "") }.getOrDefault(SpeedUnit.KNOTS)
set(v) { prefs.edit().putString(KEY_SPEED, v.name).apply() }
var distanceUnit: DistanceUnit
get() = runCatching { DistanceUnit.valueOf(prefs.getString(KEY_DISTANCE, null) ?: "") }.getOrDefault(DistanceUnit.NM)
set(v) { prefs.edit().putString(KEY_DISTANCE, v.name).apply() }
fun formatTemp(tempC: Double): String = when (tempUnit) {
TempUnit.CELSIUS -> "%.0f".format(Locale.getDefault(), tempC)
TempUnit.FAHRENHEIT -> "%.0f".format(Locale.getDefault(), tempC * 9.0 / 5.0 + 32.0)
}
fun tempUnitLabel(): String = when (tempUnit) {
TempUnit.CELSIUS -> "°C"
TempUnit.FAHRENHEIT -> "°F"
}
fun formatDepth(metres: Double): String = when (depthUnit) {
DepthUnit.FEET -> "%.1f".format(Locale.getDefault(), metres * 3.28084)
DepthUnit.METERS -> "%.1f".format(Locale.getDefault(), metres)
}
fun depthUnitLabel(): String = when (depthUnit) {
DepthUnit.FEET -> "ft"
DepthUnit.METERS -> "m"
}
fun formatPressure(hpa: Float): String = when (pressureUnit) {
PressureUnit.HPA -> "%.1f".format(Locale.getDefault(), hpa)
PressureUnit.INHG -> "%.2f".format(Locale.getDefault(), hpa * 0.02953f)
}
fun pressureUnitLabel(): String = when (pressureUnit) {
PressureUnit.HPA -> "hPa"
PressureUnit.INHG -> "inHg"
}
fun formatSpeed(knots: Double): String = when (speedUnit) {
SpeedUnit.KNOTS -> "%.1f".format(Locale.getDefault(), knots)
SpeedUnit.MPH -> "%.1f".format(Locale.getDefault(), knots * 1.15078)
SpeedUnit.KPH -> "%.1f".format(Locale.getDefault(), knots * 1.852)
}
fun speedUnitLabel(): String = when (speedUnit) {
SpeedUnit.KNOTS -> "kt"
SpeedUnit.MPH -> "mph"
SpeedUnit.KPH -> "kph"
}
fun formatDistance(nm: Double): String = when (distanceUnit) {
DistanceUnit.NM -> "%.1f".format(Locale.getDefault(), nm)
DistanceUnit.KM -> "%.1f".format(Locale.getDefault(), nm * 1.852)
DistanceUnit.MI -> "%.1f".format(Locale.getDefault(), nm * 1.15078)
}
fun distanceUnitLabel(): String = when (distanceUnit) {
DistanceUnit.NM -> "nm"
DistanceUnit.KM -> "km"
DistanceUnit.MI -> "mi"
}
companion object {
private const val KEY_TEMP = "temp_unit"
private const val KEY_DEPTH = "depth_unit"
private const val KEY_PRESSURE = "pressure_unit"
private const val KEY_SPEED = "speed_unit"
private const val KEY_DISTANCE = "distance_unit"
}
}
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