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/*
 * Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance
 * with the License. A copy of the License is located at
 *
 * http://aws.amazon.com/apache2.0/
 *
 * or in the "license" file accompanying this file. This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES
 * OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions
 * and limitations under the License.
 */
package ai.djl.util;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializer;
import com.google.gson.reflect.TypeToken;

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

/** An interface containing Gson constants. */
public interface JsonUtils {

    boolean PRETTY_PRINT = Boolean.parseBoolean(Utils.getEnvOrSystemProperty("DJL_PRETTY_PRINT"));
    Gson GSON = builder().create();
    Gson GSON_PRETTY = builder().setPrettyPrinting().create();
    Type LIST_TYPE = new TypeToken>() {}.getType();

    /**
     * Returns a custom {@code GsonBuilder} instance.
     *
     * @return a custom {@code GsonBuilder} instance.
     */
    static GsonBuilder builder() {
        GsonBuilder builder =
                new GsonBuilder()
                        .setDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'")
                        .serializeSpecialFloatingPointValues()
                        .registerTypeAdapter(
                                Double.class,
                                (JsonSerializer)
                                        (src, t, ctx) -> {
                                            long v = src.longValue();
                                            if (src.equals(Double.valueOf(String.valueOf(v)))) {
                                                return new JsonPrimitive(v);
                                            }
                                            return new JsonPrimitive(src);
                                        });
        if (PRETTY_PRINT) {
            builder.setPrettyPrinting();
        }
        return builder;
    }

    /**
     * Serializes the specified object into its equivalent JSON representation.
     *
     * @param src the source object
     * @return the json string
     */
    static String toJson(Object src) {
        return GSON.toJson(src);
    }
}