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/*
 * Copyright 2017 ~ 2025 the original author or authors. James Wong 
 *
 * 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 com.wl4g.infra.common.remoting.parse;

import static com.google.common.base.Charsets.UTF_8;

import java.io.IOException;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.nio.charset.Charset;
import java.util.concurrent.atomic.AtomicReference;

import com.fasterxml.jackson.core.JsonEncoding;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.PrettyPrinter;
import com.fasterxml.jackson.core.util.DefaultIndenter;
import com.fasterxml.jackson.core.util.DefaultPrettyPrinter;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.fasterxml.jackson.databind.SerializationConfig;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.ser.FilterProvider;
import com.fasterxml.jackson.databind.type.TypeFactory;
import com.wl4g.infra.common.lang.Assert2;
import com.wl4g.infra.common.reflect.ResolvableType;
import com.wl4g.infra.common.remoting.standard.HttpMediaType;

import org.apache.commons.lang3.reflect.TypeUtils;

/**
 * Abstract base class for Jackson based and content type independent
 * {@link HttpMessageParser} implementations.
 *
 * 

 * Compatible with Jackson 2.6 and higher, as of Spring 4.3.
 */
public abstract class AbstractJackson2HttpMessageParser extends AbstractGenericHttpMessageParser {

    protected ObjectMapper objectMapper;
    private Boolean prettyPrint;
    private PrettyPrinter ssePrettyPrinter;

    protected AbstractJackson2HttpMessageParser(ObjectMapper objectMapper) {
        init(objectMapper);
    }

    protected AbstractJackson2HttpMessageParser(ObjectMapper objectMapper, HttpMediaType supportedMediaType) {
        super(supportedMediaType);
        init(objectMapper);
    }

    protected AbstractJackson2HttpMessageParser(ObjectMapper objectMapper, HttpMediaType... supportedMediaTypes) {
        super(supportedMediaTypes);
        init(objectMapper);
    }

    protected void init(ObjectMapper objectMapper) {
        this.objectMapper = objectMapper;
        setDefaultCharset(UTF_8);
        DefaultPrettyPrinter prettyPrinter = new DefaultPrettyPrinter();
        prettyPrinter.indentObjectsWith(new DefaultIndenter("  ", "\ndata:"));
        this.ssePrettyPrinter = prettyPrinter;
    }

    /**
     * Set the {@code ObjectMapper} for this view. If not set, a default
     * {@link ObjectMapper#ObjectMapper() ObjectMapper} is used.
     * 

     * Setting a custom-configured {@code ObjectMapper} is one way to take
     * further control of the JSON serialization process. For example, an
     * extended {@link com.fasterxml.jackson.databind.ser.SerializerFactory} can
     * be configured that provides custom serializers for specific types. The
     * other option for refining the serialization process is to use Jackson's
     * provided annotations on the types to be serialized, in which case a
     * custom-configured ObjectMapper is unnecessary.
     */
    public void setObjectMapper(ObjectMapper objectMapper) {
        Assert2.notNull(objectMapper, "ObjectMapper must not be null");
        this.objectMapper = objectMapper;
        configurePrettyPrint();
    }

    /**
     * Return the underlying {@code ObjectMapper} for this view.
     */
    public ObjectMapper getObjectMapper() {
        return this.objectMapper;
    }

    /**
     * Whether to use the {@link DefaultPrettyPrinter} when writing JSON. This
     * is a shortcut for setting up an {@code ObjectMapper} as follows:
     * 
     * 
     * ObjectMapper mapper = new ObjectMapper();
     * mapper.configure(SerializationFeature.INDENT_OUTPUT, true);
     * converter.setObjectMapper(mapper);
     * 

     */
    public void setPrettyPrint(boolean prettyPrint) {
        this.prettyPrint = prettyPrint;
        configurePrettyPrint();
    }

    private void configurePrettyPrint() {
        if (this.prettyPrint != null) {
            this.objectMapper.configure(SerializationFeature.INDENT_OUTPUT, this.prettyPrint);
        }
    }

    @Override
    public boolean canRead(Class clazz, HttpMediaType mediaType) {
        return canRead(clazz, null, mediaType);
    }

    @Override
    public boolean canRead(Type type, Class contextClass, HttpMediaType mediaType) {
        if (!canRead(mediaType)) {
            return false;
        }
        JavaType javaType = getJavaType(type, contextClass);
        AtomicReference causeRef = new AtomicReference();
        if (this.objectMapper.canDeserialize(javaType, causeRef)) {
            return true;
        }
        logWarningIfNecessary(javaType, causeRef.get());
        return false;
    }

    @Override
    public boolean canWrite(Class clazz, HttpMediaType mediaType) {
        if (!canWrite(mediaType)) {
            return false;
        }
        AtomicReference causeRef = new AtomicReference();
        if (this.objectMapper.canSerialize(clazz, causeRef)) {
            return true;
        }
        logWarningIfNecessary(clazz, causeRef.get());
        return false;
    }

    /**
     * Determine whether to log the given exception coming from a
     * {@link ObjectMapper#canDeserialize} / {@link ObjectMapper#canSerialize}
     * check.
     * 
     * @param type
     *            the class that Jackson tested for (de-)serializability
     * @param cause
     *            the Jackson-thrown exception to evaluate (typically a
     *            {@link JsonMappingException})
     * @since 4.3
     */
    protected void logWarningIfNecessary(Type type, Throwable cause) {
        if (cause == null) {
            return;
        }

        boolean debugLevel = (cause instanceof JsonMappingException && cause.getMessage().startsWith("Can not find"));

        if (debugLevel ? logger.isDebugEnabled() : logger.isWarnEnabled()) {
            String msg = "Failed to evaluate Jackson " + (type instanceof JavaType ? "de" : "") + "serialization for type ["
                    + type + "]";
            if (debugLevel) {
                logger.debug(msg, cause);
            } else if (logger.isDebugEnabled()) {
                logger.warn(msg, cause);
            } else {
                logger.warn(msg + ": " + cause);
            }
        }
    }

    @Override
    protected Object readInternal(Class clazz, HttpInputMessage inputMessage)
            throws IOException, HttpMessageNotReadableException {

        JavaType javaType = getJavaType(clazz, null);
        return readJavaType(javaType, inputMessage);
    }

    @Override
    public Object read(Type type, Class contextClass, HttpInputMessage inputMessage)
            throws IOException, HttpMessageNotReadableException {

        JavaType javaType = getJavaType(type, contextClass);
        return readJavaType(javaType, inputMessage);
    }

    private Object readJavaType(JavaType javaType, HttpInputMessage inputMessage) {
        try {
            if (inputMessage instanceof MappingJacksonInputMessage) {
                Class deserializationView = ((MappingJacksonInputMessage) inputMessage).getDeserializationView();
                if (deserializationView != null) {
                    return this.objectMapper.readerWithView(deserializationView).forType(javaType).readValue(
                            inputMessage.getBody());
                }
            }
            return this.objectMapper.readValue(inputMessage.getBody(), javaType);
        } catch (JsonProcessingException ex) {
            throw new HttpMessageNotReadableException("JSON parse error: " + ex.getOriginalMessage(), ex);
        } catch (IOException ex) {
            throw new HttpMessageNotReadableException("I/O error while reading input message", ex);
        }
    }

    @Override
    protected void writeInternal(Object object, Type type, HttpOutputMessage outputMessage)
            throws IOException, HttpMessageNotWritableException {

        HttpMediaType contentType = outputMessage.getHeaders().getContentType();
        JsonEncoding encoding = getJsonEncoding(contentType);
        JsonGenerator generator = this.objectMapper.getFactory().createGenerator(outputMessage.getBody(), encoding);
        try {
            writePrefix(generator, object);

            Class serializationView = null;
            FilterProvider filters = null;
            Object value = object;
            JavaType javaType = null;
            if (object instanceof MappingJacksonValue) {
                MappingJacksonValue container = (MappingJacksonValue) object;
                value = container.getValue();
                serializationView = container.getSerializationView();
                filters = container.getFilters();
            }
            if (type != null && value != null && TypeUtils.isAssignable(type, value.getClass())) {
                javaType = getJavaType(type, null);
            }
            ObjectWriter objectWriter;
            if (serializationView != null) {
                objectWriter = this.objectMapper.writerWithView(serializationView);
            } else if (filters != null) {
                objectWriter = this.objectMapper.writer(filters);
            } else {
                objectWriter = this.objectMapper.writer();
            }
            if (javaType != null && javaType.isContainerType()) {
                objectWriter = objectWriter.forType(javaType);
            }
            SerializationConfig config = objectWriter.getConfig();
            if (contentType != null && contentType.isCompatibleWith(HttpMediaType.TEXT_EVENT_STREAM)
                    && config.isEnabled(SerializationFeature.INDENT_OUTPUT)) {
                objectWriter = objectWriter.with(this.ssePrettyPrinter);
            }
            objectWriter.writeValue(generator, value);

            writeSuffix(generator, object);
            generator.flush();

        } catch (JsonProcessingException ex) {
            throw new HttpMessageNotWritableException("Could not write JSON: " + ex.getOriginalMessage(), ex);
        }
    }

    /**
     * Write a prefix before the main content.
     * 
     * @param generator
     *            the generator to use for writing content.
     * @param object
     *            the object to write to the output message.
     */
    protected void writePrefix(JsonGenerator generator, Object object) throws IOException {
    }

    /**
     * Write a suffix after the main content.
     * 
     * @param generator
     *            the generator to use for writing content.
     * @param object
     *            the object to write to the output message.
     */
    protected void writeSuffix(JsonGenerator generator, Object object) throws IOException {
    }

    /**
     * Return the Jackson {@link JavaType} for the specified type and context
     * class.
     * 

     * The default implementation returns
     * {@code typeFactory.constructType(type, contextClass)}, but this can be
     * overridden in subclasses, to allow for custom generic collection
     * handling. For instance:
     * 
     * 
     * protected JavaType getJavaType(Type type) {
     *     if (type instanceof Class && List.class.isAssignableFrom((Class) type)) {
     *         return TypeFactory.collectionType(ArrayList.class, MyBean.class);
     *     } else {
     *         return super.getJavaType(type);
     *     }
     * }
     * 

     * 
     * @param type
     *            the generic type to return the Jackson JavaType for
     * @param contextClass
     *            a context class for the target type, for example a class in
     *            which the target type appears in a method signature (can be
     *            {@code null})
     * @return the Jackson JavaType
     */
    protected JavaType getJavaType(Type type, Class contextClass) {
        TypeFactory typeFactory = this.objectMapper.getTypeFactory();
        if (contextClass != null) {
            ResolvableType resolvedType = ResolvableType.forType(type);
            if (type instanceof TypeVariable) {
                ResolvableType resolvedTypeVariable = resolveVariable((TypeVariable) type,
                        ResolvableType.forClass(contextClass));
                if (resolvedTypeVariable != ResolvableType.NONE) {
                    return typeFactory.constructType(resolvedTypeVariable.resolve());
                }
            } else if (type instanceof ParameterizedType && resolvedType.hasUnresolvableGenerics()) {
                ParameterizedType parameterizedType = (ParameterizedType) type;
                Class[] generics = new Class[parameterizedType.getActualTypeArguments().length];
                Type[] typeArguments = parameterizedType.getActualTypeArguments();
                for (int i = 0; i < typeArguments.length; i++) {
                    Type typeArgument = typeArguments[i];
                    if (typeArgument instanceof TypeVariable) {
                        ResolvableType resolvedTypeArgument = resolveVariable((TypeVariable) typeArgument,
                                ResolvableType.forClass(contextClass));
                        if (resolvedTypeArgument != ResolvableType.NONE) {
                            generics[i] = resolvedTypeArgument.resolve();
                        } else {
                            generics[i] = ResolvableType.forType(typeArgument).resolve();
                        }
                    } else {
                        generics[i] = ResolvableType.forType(typeArgument).resolve();
                    }
                }
                return typeFactory
                        .constructType(ResolvableType.forClassWithGenerics(resolvedType.getRawClass(), generics).getType());
            }
        }
        return typeFactory.constructType(type);
    }

    private ResolvableType resolveVariable(TypeVariable typeVariable, ResolvableType contextType) {
        ResolvableType resolvedType;
        if (contextType.hasGenerics()) {
            resolvedType = ResolvableType.forType(typeVariable, contextType);
            if (resolvedType.resolve() != null) {
                return resolvedType;
            }
        }

        ResolvableType superType = contextType.getSuperType();
        if (superType != ResolvableType.NONE) {
            resolvedType = resolveVariable(typeVariable, superType);
            if (resolvedType.resolve() != null) {
                return resolvedType;
            }
        }
        for (ResolvableType ifc : contextType.getInterfaces()) {
            resolvedType = resolveVariable(typeVariable, ifc);
            if (resolvedType.resolve() != null) {
                return resolvedType;
            }
        }
        return ResolvableType.NONE;
    }

    /**
     * Determine the JSON encoding to use for the given content type.
     * 
     * @param contentType
     *            the media type as requested by the caller
     * @return the JSON encoding to use (never {@code null})
     */
    protected JsonEncoding getJsonEncoding(HttpMediaType contentType) {
        if (contentType != null && contentType.getCharset() != null) {
            Charset charset = contentType.getCharset();
            for (JsonEncoding encoding : JsonEncoding.values()) {
                if (charset.name().equals(encoding.getJavaName())) {
                    return encoding;
                }
            }
        }
        return JsonEncoding.UTF8;
    }

    @Override
    protected HttpMediaType getDefaultContentType(Object object) throws IOException {
        if (object instanceof MappingJacksonValue) {
            object = ((MappingJacksonValue) object).getValue();
        }
        return super.getDefaultContentType(object);
    }

    @Override
    protected Long getContentLength(Object object, HttpMediaType contentType) throws IOException {
        if (object instanceof MappingJacksonValue) {
            object = ((MappingJacksonValue) object).getValue();
        }
        return super.getContentLength(object, contentType);
    }

}    

    

    

            

    

            



    
    






    
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