package io.flutter.plugin.common;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.json.JSONArray;
import org.json.JSONObject;

public class JSONUtil {
  private JSONUtil() {}

  /**
   * Convert the Json java representation to Java objects. Particularly used for converting
   * JSONArray and JSONObject to Lists and Maps.
   */
  public static Object unwrap(Object o) {
    if (JSONObject.NULL.equals(o) || o == null) {
      return null;
    }
    if (o instanceof Boolean
        || o instanceof Byte
        || o instanceof Character
        || o instanceof Double
        || o instanceof Float
        || o instanceof Integer
        || o instanceof Long
        || o instanceof Short
        || o instanceof String) {
      return o;
    }
    try {
      if (o instanceof JSONArray) {
        List<Object> list = new ArrayList<>();
        JSONArray array = (JSONArray) o;
        for (int i = 0; i < array.length(); i++) {
          list.add(unwrap(array.get(i)));
        }
        return list;
      }
      if (o instanceof JSONObject) {
        Map<String, Object> map = new HashMap<>();
        JSONObject jsonObject = (JSONObject) o;
        Iterator<String> keyIterator = jsonObject.keys();
        while (keyIterator.hasNext()) {
          String key = keyIterator.next();
          map.put(key, unwrap(jsonObject.get(key)));
        }
        return map;
      }
    } catch (Exception ignored) {
    }
    return null;
  }

  /** Backport of {@link JSONObject#wrap(Object)} for use on pre-KitKat systems. */
  public static Object wrap(Object o) {
    if (o == null) {
      return JSONObject.NULL;
    }
    if (o instanceof JSONArray || o instanceof JSONObject) {
      return o;
    }
    if (o.equals(JSONObject.NULL)) {
      return o;
    }
    try {
      if (o instanceof Collection) {
        JSONArray result = new JSONArray();
        for (Object e : (Collection) o) result.put(wrap(e));
        return result;
      } else if (o.getClass().isArray()) {
        JSONArray result = new JSONArray();
        int length = Array.getLength(o);
        for (int i = 0; i < length; i++) result.put(wrap(Array.get(o, i)));
        return result;
      }
      if (o instanceof Map) {
        JSONObject result = new JSONObject();
        for (Map.Entry<?, ?> entry : ((Map<?, ?>) o).entrySet())
          result.put((String) entry.getKey(), wrap(entry.getValue()));
        return result;
      }
      if (o instanceof Boolean
          || o instanceof Byte
          || o instanceof Character
          || o instanceof Double
          || o instanceof Float
          || o instanceof Integer
          || o instanceof Long
          || o instanceof Short
          || o instanceof String) {
        return o;
      }
      if (o.getClass().getPackage().getName().startsWith("java.")) {
        return o.toString();
      }
    } catch (Exception ignored) {
    }
    return null;
  }
}