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package com.jsoniter.output;

import com.jsoniter.spi.JsonException;

import com.jsoniter.spi.Encoder;

import com.jsoniter.spi.Extension;

import com.jsoniter.spi.JsoniterSpi;

import com.jsoniter.spi.TypeLiteral;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStreamWriter;

import java.lang.reflect.Modifier;

import java.lang.reflect.ParameterizedType;

import java.lang.reflect.Type;

import java.util.*;

class Codegen {

static EncodingMode mode = EncodingMode.REFLECTION_MODE;

static boolean isDoingStaticCodegen;

// only read/write when generating code with synchronized protection

private final static Map<String, CodegenResult> generatedSources = new HashMap<String, CodegenResult>();

private volatile static Map<String, Encoder> reflectionEncoders = new HashMap<String, Encoder>();

static {

String envMode = System.getenv("JSONITER_ENCODING_MODE");

if (envMode != null) {

mode = EncodingMode.valueOf(envMode);

}

}

public static void setMode(EncodingMode mode) {

Codegen.mode = mode;

}

public static Encoder getReflectionEncoder(String cacheKey, Type type) {

Encoder encoder = CodegenImplNative.NATIVE_ENCODERS.get(type);

if (encoder != null) {

return encoder;

}

encoder = reflectionEncoders.get(cacheKey);

if (encoder != null) {

return encoder;

}

synchronized (Codegen.class) {

encoder = reflectionEncoders.get(cacheKey);

if (encoder != null) {

return encoder;

}

Type[] typeArgs = new Type[0];

Class clazz;

if (type instanceof ParameterizedType) {

ParameterizedType pType = (ParameterizedType) type;

clazz = (Class) pType.getRawType();

typeArgs = pType.getActualTypeArguments();

} else {

clazz = (Class) type;

}

encoder = ReflectionEncoderFactory.create(clazz, typeArgs);

HashMap<String, Encoder> copy = new HashMap<String, Encoder>(reflectionEncoders);

copy.put(cacheKey, encoder);

reflectionEncoders = copy;

return encoder;

}

}

public static Encoder getEncoder(String cacheKey, Type type) {

Encoder encoder = JsoniterSpi.getEncoder(cacheKey);

if (encoder != null) {

return encoder;

}

return gen(cacheKey, type);

}

private static synchronized Encoder gen(String cacheKey, Type type) {

Encoder encoder = JsoniterSpi.getEncoder(cacheKey);

if (encoder != null) {

return encoder;

}

List<Extension> extensions = JsoniterSpi.getExtensions();

for (Extension extension : extensions) {

encoder = extension.createEncoder(cacheKey, type);

if (encoder != null) {

JsoniterSpi.addNewEncoder(cacheKey, encoder);

return encoder;

}

}

encoder = CodegenImplNative.NATIVE_ENCODERS.get(type);

if (encoder != null) {

JsoniterSpi.addNewEncoder(cacheKey, encoder);

return encoder;

}

Type[] typeArgs = new Type[0];

Class clazz;

if (type instanceof ParameterizedType) {

ParameterizedType pType = (ParameterizedType) type;

clazz = (Class) pType.getRawType();

typeArgs = pType.getActualTypeArguments();

} else {

clazz = (Class) type;

}

if (mode == EncodingMode.REFLECTION_MODE) {

encoder = ReflectionEncoderFactory.create(clazz, typeArgs);

JsoniterSpi.addNewEncoder(cacheKey, encoder);

return encoder;

}

if (!isDoingStaticCodegen) {

try {

encoder = (Encoder) Class.forName(cacheKey).newInstance();

JsoniterSpi.addNewEncoder(cacheKey, encoder);

return encoder;

} catch (Exception e) {

if (mode == EncodingMode.STATIC_MODE) {

throw new JsonException("static gen should provide the encoder we need, but failed to create the encoder", e);

}

}

}

clazz = chooseAccessibleSuper(clazz);

CodegenResult source = genSource(cacheKey, clazz, typeArgs);

try {

generatedSources.put(cacheKey, source);

if (isDoingStaticCodegen) {

staticGen(clazz, cacheKey, source);

} else {

encoder = DynamicCodegen.gen(clazz, cacheKey, source);

}

JsoniterSpi.addNewEncoder(cacheKey, encoder);

return encoder;

} catch (Exception e) {

String msg = "failed to generate encoder for: " + type + " with " + Arrays.toString(typeArgs) + ", exception: " + e;

msg = msg + "\n" + source;

throw new JsonException(msg, e);

}

}

private static Class chooseAccessibleSuper(Class clazz) {

if (Modifier.isPublic(clazz.getModifiers())) {

return clazz;

}

return chooseAccessibleSuper(clazz.getSuperclass());

}

public static CodegenResult getGeneratedSource(String cacheKey) {

return generatedSources.get(cacheKey);

}

private static void staticGen(Class clazz, String cacheKey, CodegenResult source) throws IOException {

createDir(cacheKey);

String fileName = cacheKey.replace('.', '/') + ".java";

FileOutputStream fileOutputStream = new FileOutputStream(fileName);

try {

OutputStreamWriter writer = new OutputStreamWriter(fileOutputStream);

try {

staticGen(clazz, cacheKey, writer, source);

} finally {

writer.close();

}

} finally {

fileOutputStream.close();

}

}

private static void staticGen(Class clazz, String cacheKey, OutputStreamWriter writer, CodegenResult source) throws IOException {

String className = cacheKey.substring(cacheKey.lastIndexOf('.') + 1);

String packageName = cacheKey.substring(0, cacheKey.lastIndexOf('.'));

writer.write("package " + packageName + ";\n");

writer.write("public class " + className + " extends com.jsoniter.spi.EmptyEncoder {\n");

writer.write(source.generateWrapperCode(clazz));

writer.write(source.toString());

writer.write("}\n");

}

private static void createDir(String cacheKey) {

String[] parts = cacheKey.split("\\.");

File parent = new File(".");

for (int i = 0; i < parts.length - 1; i++) {

String part = parts[i];

File current = new File(parent, part);

current.mkdir();

parent = current;

}

}

private static CodegenResult genSource(String cacheKey, Class clazz, Type[] typeArgs) {

if (clazz.isArray()) {

return CodegenImplArray.genArray(cacheKey, clazz);

}

if (Map.class.isAssignableFrom(clazz)) {

return CodegenImplMap.genMap(cacheKey, clazz, typeArgs);

}

if (Collection.class.isAssignableFrom(clazz)) {

return CodegenImplArray.genCollection(cacheKey, clazz, typeArgs);

}

if (clazz.isEnum()) {

return CodegenImplNative.genEnum(clazz);

}

return CodegenImplObject.genObject(clazz);

}

public static void staticGenEncoders(TypeLiteral[] typeLiterals) {

isDoingStaticCodegen = true;

for (TypeLiteral typeLiteral : typeLiterals) {

gen(typeLiteral.getEncoderCacheKey(), typeLiteral.getType());

}

}

}