package uk.silverlabs.silverdroid.config

import android.content.Context
import kotlinx.serialization.json.Json
import java.io.IOException

/**
 * Loads app configuration from assets/config.json
 * Falls back to default configuration if file doesn't exist
 */
object ConfigLoader {

    private const val CONFIG_FILE = "config.json"

    private val json = Json {
        ignoreUnknownKeys = true
        isLenient = true
        prettyPrint = true
    }

    fun loadConfig(context: Context): AppConfig {
        return try {
            val configJson = context.assets.open(CONFIG_FILE).bufferedReader().use { it.readText() }
            json.decodeFromString<AppConfig>(configJson)
        } catch (e: IOException) {
            // File doesn't exist, return default config
            getDefaultConfig()
        } catch (e: Exception) {
            // Parsing error, log and return default
            android.util.Log.e("ConfigLoader", "Error loading config", e)
            getDefaultConfig()
        }
    }

    private fun getDefaultConfig() = AppConfig(
        appName = "SilverDROID",
        targetUrl = "https://silverdesk-staging.silverlabs.uk/",
        showUrlBar = false,
        allowNavigation = true
    )

    /**
     * Example configuration for reference
     */
    fun getExampleConfig() = """
    {
      "appName": "SilverDesk Staging",
      "appVersion": "1.0.0",
      "targetUrl": "https://silverdesk-staging.silverlabs.uk/",
      "showUrlBar": false,
      "allowNavigation": true,
      "vpn": {
        "enabled": true,
        "autoConnect": true,
        "privateKey": "YOUR_PRIVATE_KEY_HERE",
        "address": "10.0.0.2/24",
        "dns": ["1.1.1.1", "1.0.0.1"],
        "peers": [
          {
            "publicKey": "SERVER_PUBLIC_KEY_HERE",
            "endpoint": "vpn.example.com:51820",
            "allowedIps": ["0.0.0.0/0"],
            "persistentKeepalive": 25
          }
        ]
      },
      "tor": {
        "enabled": false,
        "autoConnect": false,
        "useBridges": false,
        "bridges": [],
        "socksPort": 9050,
        "controlPort": 9051
      },
      "theme": {
        "primaryColor": "#1976D2",
        "backgroundColor": "#FFFFFF",
        "statusBarColor": "#1976D2"
      }
    }
    """.trimIndent()
}