package su.xserver.iikocon;

import io.vertx.core.Future;
import io.vertx.core.json.JsonObject;
import io.vertx.sqlclient.Pool;
import io.vertx.sqlclient.templates.SqlTemplate;

import java.util.Map;

public class SettingsService {
  private final Pool pool;

  public SettingsService(Pool pool) { this.pool = pool; }

  public Future<Void> initDatabase() {
    String createTable = """
        CREATE TABLE IF NOT EXISTS app_settings (
          setting_key VARCHAR(255) PRIMARY KEY,
          setting_value TEXT
        )
        """;
    return pool.query(createTable).execute()
      .compose(v -> setIfAbsent("site_name", "Admin Panel"))
      .compose(v -> setIfAbsent("site_description", "Powerful administration dashboard"))
      .compose(v -> setIfAbsent("theme", "light"))
      .compose(v -> setIfAbsent("items_per_page", "20"))
      .compose(v -> setIfAbsent("enable_registration", "true"))
      .compose(v -> setIfAbsent("maintenance_mode", "false"))
      .compose(v -> setIfAbsent("default_language", "en"))
      .compose(v -> setIfAbsent("session_timeout_minutes", "60"))
      .compose(v -> setIfAbsent("logo_url", "/assets/logo.png"))
      .mapEmpty();
  }

  private Future<Void> setIfAbsent(String key, String defaultValue) {
    return get(key).compose(existing -> {
      if (existing == null) {
        return set(key, defaultValue);
      }
      return Future.succeededFuture();
    });
  }

  public Future<String> get(String key) {
    return SqlTemplate.forQuery(pool, "SELECT setting_value FROM app_settings WHERE setting_key = #{key}")
      .execute(Map.of("key", key))
      .map(rows -> rows.iterator().hasNext() ? rows.iterator().next().getString("setting_value") : null);
  }

  public Future<Void> set(String key, String value) {
    return SqlTemplate.forUpdate(pool,
        "INSERT INTO app_settings (setting_key, setting_value) VALUES (#{key}, #{value}) " +
          "ON DUPLICATE KEY UPDATE setting_value = #{value}")
      .execute(Map.of("key", key, "value", value))
      .mapEmpty();
  }

  public Future<JsonObject> getAll() {
    return pool.query("SELECT setting_key, setting_value FROM app_settings")
      .execute()
      .map(rows -> {
        JsonObject json = new JsonObject();
        rows.forEach(row -> json.put(row.getString("setting_key"), row.getString("setting_value")));
        return json;
      });
  }
}