import { Preferences } from "@capacitor/preferences";
import { isNativeApp } from "./server-config";

/**
 * Unified storage adapter.
 * Uses Capacitor Preferences in native builds, localStorage in web builds.
 * All methods are async to keep the interface uniform.
 */
export const storage = {
  /**
   * Read a string value by key. Returns null if missing or on error.
   * @param {string} key
   * @returns {Promise<string|null>}
   */
  async get(key) {
    if (isNativeApp()) {
      try {
        const { value } = await Preferences.get({ key });
        return value;
      } catch {
        return null;
      }
    }
    try {
      return localStorage.getItem(key);
    } catch {
      return null;
    }
  },

  /**
   * Write a string value by key.
   * @param {string} key
   * @param {string} value
   * @returns {Promise<void>}
   */
  async set(key, value) {
    if (isNativeApp()) {
      try {
        await Preferences.set({ key, value });
      } catch {
        // ignore
      }
      return;
    }
    try {
      localStorage.setItem(key, value);
    } catch {
      // ignore (private mode, quota exceeded, etc.)
    }
  },

  /**
   * Remove a key.
   * @param {string} key
   * @returns {Promise<void>}
   */
  async remove(key) {
    if (isNativeApp()) {
      try {
        await Preferences.remove({ key });
      } catch {
        // ignore
      }
      return;
    }
    try {
      localStorage.removeItem(key);
    } catch {
      // ignore
    }
  },
};
