package org.opentracker

import android.content.Context
import android.content.SharedPreferences
import kotlin.properties.ReadWriteProperty
import kotlin.reflect.KProperty

/** Everything the app keeps. The service reads it on every start, because a restarted sticky service gets no Intent. */
class Prefs(context: Context) {
    val raw: SharedPreferences = context.getSharedPreferences("ot", Context.MODE_PRIVATE)

    // The property name is the stored key. Renaming a property loses the setting on existing installs.
    var url by string()
    var token by string()
    var tracking by boolean()

    /** The secret behind a pairing challenge, until the browser returns with a code. */
    var pairVerifier by string()

    /** A [Mode] name. */
    var mode by string()
    var lastUploadMs by long()
    var queued by long()
    var error by string()

    /** The mode in the user's language. */
    fun modeLabel(context: Context): String? = when (mode) {
        Mode.VEHICLE.name -> context.getString(R.string.mode_vehicle)
        Mode.WALK.name -> context.getString(R.string.mode_walk)
        Mode.DWELL.name -> context.getString(R.string.mode_dwell)
        Mode.STATIONARY.name -> context.getString(R.string.mode_stationary)
        else -> null
    }

    fun asked(step: String): Boolean = raw.getBoolean("asked $step", false)

    fun markAsked(step: String) = raw.edit().putBoolean("asked $step", true).apply()

    private fun string() = pref({ getString(it, null) }, { k, v: String? -> putString(k, v) })

    private fun long() = pref({ getLong(it, 0) }, { k, v: Long -> putLong(k, v) })

    private fun boolean() = pref({ getBoolean(it, false) }, { k, v: Boolean -> putBoolean(k, v) })

    private fun <T> pref(get: SharedPreferences.(String) -> T, put: SharedPreferences.Editor.(String, T) -> Unit) =
        object : ReadWriteProperty<Any?, T> {
            override fun getValue(thisRef: Any?, property: KProperty<*>): T = raw.get(property.name)

            override fun setValue(thisRef: Any?, property: KProperty<*>, value: T) =
                raw.edit().apply { put(property.name, value) }.apply()
        }
}