package com.hyperling.weather

import java.io.File

/**
 * File-based local storage manager for location entries (JVM/Desktop).
 */
class JvmStorageBackend : StorageBackend {
    private val STORAGE_DIR = File(System.getProperty("user.home"), ".nomadic-weather")
    private val STORAGE_FILE = File(STORAGE_DIR, "locations.json")

    init {
        STORAGE_DIR.mkdirs()
    }

    override fun load(): List<LocationEntry> {
        return try {
            if (STORAGE_FILE.exists()) {
                LocationSerializer.jsonToLocations(STORAGE_FILE.readText())
            } else emptyList()
        } catch (e: Exception) {
            emptyList()
        }
    }

    override fun save(locations: List<LocationEntry>) {
        try {
            STORAGE_DIR.mkdirs()
            STORAGE_FILE.writeText(LocationSerializer.locationsToJson(locations))
        } catch (e: Exception) {}
    }

    override fun saveOne(location: LocationEntry) {
        val existing = load().toMutableList()
        val idx = existing.indexOfFirst { it == location }
        if (idx >= 0) existing[idx] = location
        else {
            if (existing.size >= 8) existing.removeAt(0)
            existing.add(location)
        }
        save(existing)
    }

    override fun delete(id: Long) {
        save(load().filter { it.id != id })
    }
}

actual fun LocationStorage.getStorage(): StorageBackend = JvmStorageBackend()