ariane/app/src/main/java/oppen/tva/io/history/BasicCache.kt

package oppen.tva.io.history

import android.content.Context
import java.net.URI
import kotlin.text.StringBuilder

/**
 *
 * This is slow, unsafe, awful, and synchronous but I don't want get bogged down implementing Room just yet
 *
 */
class BasicCache(context: Context): CacheInterface {

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

    override fun update(tabs: List<Tab>, activeIndex: Int) {
        val sb = StringBuilder()
        tabs.forEach { tab ->
            sb.append("${tab.index}$DELIM")
            tab.history.forEach { uri ->
                sb.append("$uri$DELIM")
            }
            sb.append("\n")
        }

        val edit = prefs.edit()
        val raw = sb.toString()

        println("------------------------------------")
        println(raw)
        println("------------------------------------")

        edit.putString(prefsCacheKey, sb.toString())
        edit.putInt(prefsActiveIndexKey, activeIndex)
        edit.apply()
    }

    override fun getTabs(onTabs: (tabs: MutableList<Tab>, activeIndex: Int) -> Unit) {
        val raw = prefs.getString(prefsCacheKey, null)

        println("====================================")
        println(raw)
        println("====================================")

        if (raw == null) {
            onTabs(arrayListOf(), 0)
        } else {
            val activeIndex = prefs.getInt(prefsActiveIndexKey, 0)
            val tabs = mutableListOf<Tab>()
            raw.lines().forEach { line ->
                if (line.trim().isNotEmpty()) {
                    val segs = line.split(DELIM)
                    val tabIndex = segs.first()
                    val tab = Tab(tabIndex.toInt())
                    for (index in 1 until segs.size) {
                        val address = segs[index]
                        if (address.isNotBlank()) {
                            tab.history.add(URI.create(address))
                        }
                    }
                    tabs.add(tab)
                }
            }

            onTabs(tabs, activeIndex)
        }
    }
}