package com.myfatoorahreactnative.utils;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonArray;
import com.google.gson.JsonParseException;
import com.google.gson.JsonParser;

import com.myfatoorah.sdk.entity.executepayment.MFExecutePaymentRequest;
import com.myfatoorah.sdk.entity.executepayment.MFPaymentWithSavedTokenRequest;
import com.myfatoorah.sdk.entity.sendpayment.MFSendPaymentRequest;
import com.myfatoorah.sdk.enums.MFFontFamily;
import com.myfatoorahreactnative.models.MFDirectPaymentRequest;

import java.lang.reflect.Type;
import java.util.Map;

public class MFJsonAdapterHelper<T> implements JsonDeserializer<T> {
  private boolean isUpperCaseJson = true;

  @Override
  public T deserialize(JsonElement json, Type myClassType, JsonDeserializationContext context)
    throws JsonParseException {
    JsonObject replacementJsonObject = GenerateSubClass(json);

    // TODO remove after updating native SDK
    if (myClassType == MFExecutePaymentRequest.class || myClassType == MFSendPaymentRequest.class) {
      replacementJsonObject.addProperty("CallBackUrl", MFConstants.CALL_BACK_URL);
      replacementJsonObject.addProperty("ErrorUrl", MFConstants.ERROR_URL);
    } else if (myClassType == MFDirectPaymentRequest.class) {
      JsonObject executePaymentRequest = replacementJsonObject.get("ExecutePaymentRequest").getAsJsonObject();
      executePaymentRequest.addProperty("CallBackUrl", MFConstants.CALL_BACK_URL);
      executePaymentRequest.addProperty("ErrorUrl", MFConstants.ERROR_URL);
    } else if (myClassType == MFPaymentWithSavedTokenRequest.class) {
      JsonObject executePaymentRequest = replacementJsonObject.get("ExecutePaymentRequest").getAsJsonObject();
      executePaymentRequest.addProperty("CallBackUrl", MFConstants.CALL_BACK_URL);
      executePaymentRequest.addProperty("ErrorUrl", MFConstants.ERROR_URL);
    }

    Gson gson = new GsonBuilder()
      .registerTypeAdapter(MFFontFamily.class,
        (JsonDeserializer<MFFontFamily>)
        (json2, type, ctx) -> MFFontFamily.Companion.getValue(json2.getAsString())
      )
      .create();
    return gson.fromJson(replacementJsonObject, myClassType);
  }

  public String convertJsonStringToLowercase(String jsonString) {
    isUpperCaseJson = false;
    JsonObject jsonObject = new JsonParser().parse(jsonString).getAsJsonObject();
    JsonObject map = GenerateSubClass(jsonObject);
    return new Gson().toJson(map);
  }

  public String convertJsonStringToUppercase(String jsonString) {
    isUpperCaseJson = true;
    JsonObject jsonObject = new JsonParser().parse(jsonString).getAsJsonObject();
    JsonObject map = GenerateSubClass(jsonObject);
    return new Gson().toJson(map);
  }

  private JsonObject GenerateSubClass(JsonElement json) {
    JsonObject originalJsonObject = json.getAsJsonObject();
    JsonObject replacementJsonObject = new JsonObject();
    for (Map.Entry<String, JsonElement> elementEntry : originalJsonObject.entrySet()) {
      String key = elementEntry.getKey();
      JsonElement value = originalJsonObject.get(key);
      if (isUpperCaseJson)
        key = key.substring(0, 1).toUpperCase() + key.substring(1);
      else
        key = key.substring(0, 1).toLowerCase() + key.substring(1);
      if (value.isJsonObject())
        value = HandleJsonObject(value);
      else if (value.isJsonArray())
        value = HandleJsonArray(value);
      replacementJsonObject.add(key, value);
    }
    return replacementJsonObject;
  }

  private JsonElement HandleJsonObject(JsonElement value) {
    return GenerateSubClass(value);
  }

  private JsonArray HandleJsonArray(JsonElement value) {
    JsonArray jsonArray = new JsonArray();
    for (JsonElement jsonElement : value.getAsJsonArray())
      jsonArray.add(GenerateSubClass(jsonElement));
    return jsonArray;
  }
}