package oppen.tva.io.history

import android.content.Context
import org.json.JSONArray
import org.json.JSONObject

/**
 *
 * This is a simple SharedPreferences based store for now because I don't want to get bogged down setting up Room at this point
 *
 */
class SimplePrefsCache(context: Context): CacheInterface {

    private val prefsKey = "oppen.tva.io.history.SimplePrefsCache.PREFS_KEY"
    private val prefsCacheKey = "oppen.tva.io.history.SimplePrefsCache.PREFS_CACHE_KEY"
    private val prefsActiveIndexKey = "oppen.tva.io.history.SimplePrefsCache.PREFS_ACTIVE_INDEX_KEY"
    private val prefs = context.getSharedPreferences(prefsKey, Context.MODE_PRIVATE)

    override fun getTabs(onTabs: (tabs: MutableList<Tab>, activeIndex: Int) -> Unit) {
        val activeIndex = prefs.getInt(prefsActiveIndexKey, 0)
        when (val rawJson = prefs.getString(prefsCacheKey, null)) {
            null -> onTabs(arrayListOf(), activeIndex)
            else -> {
                val tabs = mutableListOf<Tab>()
                val tabsJsonArray = JSONArray(rawJson)
                val tabCount = tabsJsonArray.length()
                for(index in 0 until tabCount){
                    val jsonTabObject = tabsJsonArray.getJSONObject(index)
                    val tabIndex = jsonTabObject.getInt("index")
                    val tab = Tab(tabIndex)
                    val jsonTabHistory = jsonTabObject.getJSONArray("history")
                    val historySize = jsonTabHistory.length()
                    for(historyIndex in 0 until historySize){
                        tab.add(jsonTabHistory.getString(historyIndex))
                    }
                    tabs.add(tab)
                }

                onTabs(tabs, activeIndex)
            }
        }
    }

    override fun update(tabs: List<Tab>, activeIndex: Int) {
        val edit = prefs.edit()
        edit.putInt(prefsActiveIndexKey, activeIndex)
        edit.putString(prefsCacheKey, tabsToJson(tabs))
        edit.apply()
    }

    private fun tabsToJson(tabs: List<Tab>): String {
        val jsonArray = JSONArray()
        tabs.forEach { tab ->
            val jsonTab = JSONObject()
            jsonTab.put("index", tab.index)

            val jsonHistoryArray = JSONArray()
            tab.history.forEach { uri ->
                jsonHistoryArray.put(uri.toString())
            }
            jsonTab.put("history", jsonHistoryArray)
            jsonArray.put(jsonTab)
        }
        val rawJsonArray = jsonArray.toString(5)
        println("Raw tabs json to store:\n$rawJsonArray")
        return rawJsonArray
    }
}