/*
 * Copyright Confluent Inc
 * Copyright 2019 Red Hat
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License 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 io.apicurio.registry.utils.serde;

import org.apache.avro.Schema;
import org.apache.avro.generic.GenericContainer;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

/**
 * @author Confluent Inc.
 * @author Ales Justin
 */
class AvroSchemaUtils {

    private static final Map<String, Schema> primitiveSchemas;

    static {
        Schema.Parser parser = new Schema.Parser();
        primitiveSchemas = new HashMap<>();
        primitiveSchemas.put("Null", createPrimitiveSchema(parser, "null"));
        primitiveSchemas.put("Boolean", createPrimitiveSchema(parser, "boolean"));
        primitiveSchemas.put("Integer", createPrimitiveSchema(parser, "int"));
        primitiveSchemas.put("Long", createPrimitiveSchema(parser, "long"));
        primitiveSchemas.put("Float", createPrimitiveSchema(parser, "float"));
        primitiveSchemas.put("Double", createPrimitiveSchema(parser, "double"));
        primitiveSchemas.put("String", createPrimitiveSchema(parser, "string"));
        primitiveSchemas.put("Bytes", createPrimitiveSchema(parser, "bytes"));
    }

    private static Schema createPrimitiveSchema(Schema.Parser parser, String type) {
        String schemaString = String.format("{\"type\" : \"%s\"}", type);
        return parser.parse(schemaString);
    }

    static Schema copyOf(Schema schema) {
        return parse(schema.toString());
    }

    static Schema parse(String schema) {
        return new Schema.Parser().parse(schema);
    }

    static Map<String, Schema> getPrimitiveSchemas() {
        return Collections.unmodifiableMap(primitiveSchemas);
    }

    static Schema getSchema(Object object) {
        if (object == null) {
            return primitiveSchemas.get("Null");
        } else if (object instanceof Boolean) {
            return primitiveSchemas.get("Boolean");
        } else if (object instanceof Integer) {
            return primitiveSchemas.get("Integer");
        } else if (object instanceof Long) {
            return primitiveSchemas.get("Long");
        } else if (object instanceof Float) {
            return primitiveSchemas.get("Float");
        } else if (object instanceof Double) {
            return primitiveSchemas.get("Double");
        } else if (object instanceof CharSequence) {
            return primitiveSchemas.get("String");
        } else if (object instanceof byte[]) {
            return primitiveSchemas.get("Bytes");
        } else if (object instanceof GenericContainer) {
            return ((GenericContainer) object).getSchema();
        } else {
            throw new IllegalArgumentException(
                "Unsupported Avro type. Supported types are null, Boolean, Integer, Long, "
                + "Float, Double, String, byte[] and GenericContainer");
        }
    }
}