package com.bitcointxoko.gudariwallet.service

import android.content.Context
import timber.log.Timber
import com.bitcointxoko.gudariwallet.api.NodeAliasClient as NodeAliasApiClient
import com.bitcointxoko.gudariwallet.data.NodeAliasCacheRepository
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow

private const val TAG = "NodeAliasService"

class NodeAliasService(
    private val apiClient: NodeAliasApiClient,   // ← injected, not duplicated
    context: Context
) {
    private val repo = NodeAliasCacheRepository(context)

    private val _aliases = MutableStateFlow<Map<String, String>>(emptyMap())
    val aliases: StateFlow<Map<String, String>> = _aliases.asStateFlow()

    suspend fun warmUp() {
        _aliases.value = repo.loadAll()
    }

    suspend fun resolve(pubkey: String): String? {
        // 1. Room cache hit
        repo.get(pubkey)?.let {
            Timber.d("ALIAS [CACHE HIT ] $pubkey → \"$it\"")
            return it
        }

        // 2. Network via api/NodeAliasService (Retrofit, typed responses)
        Timber.d("ALIAS [CACHE MISS] $pubkey — fetching from network")
        val alias = apiClient.resolveAlias(pubkey) ?: run {
            Timber.w("ALIAS [NOT FOUND ] $pubkey")
            return null
        }

        // 3. Persist to Room
        repo.put(pubkey, alias)

        // 4. Publish to StateFlow
        _aliases.value += (pubkey to alias)

        Timber.d("ALIAS [FETCHED   ] $pubkey → \"$alias\"")
        return alias
    }

    suspend fun clearPersistedCache() {
        repo.clearAll()
        _aliases.value = emptyMap()
    }
}