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/*
 * Copyright 2019 the original author or authors.
 *
 * Licensed under the Apache, 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.gnu.org/licenses/lgpl-3.0.html
 *
 * 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.jn.easyjson.fastjson;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONException;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.parser.DefaultJSONParser;
import com.alibaba.fastjson.parser.JSONLexer;
import com.alibaba.fastjson.parser.JSONToken;
import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.serializer.JSONSerializer;
import com.jn.easyjson.core.JsonException;
import com.jn.easyjson.core.JsonHandlerAdapter;
import com.jn.easyjson.core.JsonTreeNode;
import com.jn.easyjson.core.node.JsonNullNode;
import com.jn.easyjson.core.node.JsonPrimitiveNode;
import com.jn.easyjson.core.util.JSONs;
import com.jn.easyjson.fastjson.node.FastjsonMapper;
import com.jn.langx.text.translate.StringEscapes;
import com.jn.langx.util.Objs;
import com.jn.langx.util.io.IOs;
import com.jn.langx.util.io.unicode.Utf8s;

import java.io.IOException;
import java.io.Reader;
import java.lang.reflect.Type;

public class FastJsonAdapter extends JsonHandlerAdapter {

    @Override
    public  T deserialize(String json, Type typeOfT) throws JsonException {
        try {
            return parse(json, typeOfT);
        } catch (JSONException ex) {
            boolean changed = false;
            boolean rejudge = false;
            String json2 = json;
            if (getJsonBuilder().enableDecodeHex()) {
                json2 = Utf8s.convertHexToUnicode(json2);
                rejudge = true;
            }
            if (getJsonBuilder().enableUnescapeEscapeCharacter()) {
                json2 = StringEscapes.unescapeJson(json2);
                rejudge = true;
            }
            if (rejudge) {
                changed = !Objs.equals(json, json2);
            }
            if (changed) {
                return parse(json2, typeOfT);
            }
            throw ex;
        }
    }

    private  T parse(String json, Type typeOfT) throws JSONException {
        DefaultJSONParser parser = getDelegate().getDeserializerBuilder().build(json);
        T value = parser.parseObject(typeOfT);
        parser.handleResovleTask(value);
        parser.close();
        return value;
    }

    @Override
    public  T deserialize(Reader reader, Type typeOfT) throws JsonException {
        try {
            String json = IOs.readAsString(reader);
            return deserialize(json, typeOfT);
        } catch (IOException ex) {
            throw new JsonException(ex.getMessage(), ex);
        }
    }


    @Override
    public JsonTreeNode deserialize(String json) throws JsonException {
        JsonTreeNode jsonNode = null;
        try {
            jsonNode = parseAsJsonTreeNode(json);
        } catch (JSONException ex) {
            boolean changed = false;
            boolean rejudge = false;
            String json2 = json;
            if (getJsonBuilder().enableDecodeHex()) {
                json2 = Utf8s.convertHexToUnicode(json2);
                rejudge = true;
            }
            if (getJsonBuilder().enableUnescapeEscapeCharacter()) {
                json2 = StringEscapes.unescapeJson(json2);
                rejudge = true;
            }
            if (rejudge) {
                changed = !Objs.equals(json, json2);
            }
            if (changed) {
                jsonNode =parseAsJsonTreeNode(json);
                return jsonNode;
            }
            throw ex;
        }
        return FastjsonMapper.toJsonTreeNode(jsonNode);
    }


    private JsonTreeNode parseAsJsonTreeNode(String json){
        JSON jsonNode = null;
        if (JSONs.isJsonArray(json)) {
            // jsonNode = parseArray(json);
            jsonNode = JSONArray.parseArray(json);
        } else if (JSONs.isJsonObject(json)) {
            // jsonNode = (JSONObject) parseObject(json, ParserConfig.getGlobalInstance(), JSON.DEFAULT_PARSER_FEATURE);
            jsonNode = JSONObject.parseObject(json);
        }
        if(jsonNode!=null) {
            return FastjsonMapper.toJsonTreeNode(jsonNode);
        }
        else{
            if(json==null){
                return JsonNullNode.INSTANCE;
            }else{
                return new JsonPrimitiveNode(json);
            }
        }
    }

    private static Object parseObject(String text, ParserConfig config, int features) {
        if (text == null) {
            return null;
        }

        DefaultJSONParser parser = new DefaultJSONParser(text, config, features);
        Object value = parser.parse();

        parser.handleResovleTask(value);

        // 不使用 parser.close()
        parser.getLexer().close();

        return value;
    }

    private static JSONArray parseArray(String text) {
        if (text == null) {
            return null;
        }

        DefaultJSONParser parser = new DefaultJSONParser(text, ParserConfig.getGlobalInstance());

        JSONArray array;

        JSONLexer lexer = parser.lexer;
        if (lexer.token() == JSONToken.NULL) {
            lexer.nextToken();
            array = null;
        } else if (lexer.token() == JSONToken.EOF) {
            array = null;
        } else {
            array = new JSONArray();
            parser.parseArray(array);

            parser.handleResovleTask(array);
        }

        // 不使用 parser.close()
        parser.getLexer().close();

        return array;
    }

    @Override
    public String serialize(Object src, Type typeOfT) throws JsonException {
        if (src instanceof JsonTreeNode) {
            JsonTreeNode element = (JsonTreeNode) src;
            return getDelegate().getJsonTreeSerializerBuilder().build().toJson(element);
        }
        JSONSerializer serializer = getDelegate().getSerializerBuilder().build();
        serializer.write(src);
        return serializer.toString();
    }

    @Deprecated
    public void setFastJson(FastJson fastJson) {
        setDelegate(fastJson);
    }

}