PreferenceHelper.kt

import android.content.Context
import android.content.SharedPreferences
import com.google.gson.Gson
import com.google.gson.reflect.TypeToken

/**
 * Created by oakkub on 10/18/2017 AD.
 */
object PreferenceHelper {

    private const val prefsName = "trueyou_edc_prefs"

    lateinit var prefs: SharedPreferences
    lateinit var gson: Gson

    fun init(context: Context, gson: Gson) {
        this.prefs = context.applicationContext.getSharedPreferences(prefsName, Context.MODE_PRIVATE)
        this.gson = gson
    }

    fun putString(key: String, value: String) {
        checkValidPrefsKey(key)
        prefs.edit().putString(key, value).apply()
    }

    fun putInt(key: String, value: Int) {
        checkValidPrefsKey(key)
        prefs.edit().putInt(key, value).apply()
    }

    fun putBoolean(key: String, value: Boolean) {
        checkValidPrefsKey(key)
        prefs.edit().putBoolean(key, value).apply()
    }

    fun putFloat(key: String, value: Float) {
        checkValidPrefsKey(key)
        prefs.edit().putFloat(key, value).apply()
    }

    fun putLong(key: String, value: Long) {
        checkValidPrefsKey(key)
        prefs.edit().putLong(key, value).apply()
    }

    fun <E> putObject(key: String, value: E) {
        checkValidPrefsKey(key)

        val jsonData = gson.toJson(value)
        prefs.edit().putString(key, jsonData).apply()
    }

    fun getString(key: String, defValue: String): String {
        checkValidPrefsKey(key)
        return prefs.getString(key, defValue)
    }

    fun getInt(key: String, defValue: Int): Int {
        checkValidPrefsKey(key)
        return prefs.getInt(key, defValue)
    }

    fun getBoolean(key: String, defValue: Boolean): Boolean {
        checkValidPrefsKey(key)
        return prefs.getBoolean(key, defValue)
    }

    fun getFloat(key: String, defValue: Float): Float {
        checkValidPrefsKey(key)
        return prefs.getFloat(key, defValue)
    }

    fun getLong(key: String, defValue: Long): Long {
        checkValidPrefsKey(key)
        return prefs.getLong(key, defValue)
    }

    inline fun <reified E> getObject(key: String): E? {
        val dataJson = prefs.getString(key, null) ?: return null
        return gson.fromJson(dataJson, object: TypeToken<E>() {}.type)
    }

    operator fun contains(key: String): Boolean {
        checkValidPrefsKey(key)
        return prefs.contains(key)
    }

    fun remove(key: String) {
        checkValidPrefsKey(key)
        prefs.edit().remove(key).apply()
    }

    fun clear() {
        prefs.edit().clear().apply()
    }

    fun checkValidPrefsKey(key: String) {
        require(!key.isBlank()) {
            throw IllegalArgumentException("Preferences key must not empty")
        }
    }

}