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zfoo protocol is binary serialization framework for Java/C++/js/ts/C#/Go/Lua/GDScript/Python
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/*
 * Copyright (C) 2020 The zfoo Authors
 *
 * 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.zfoo.protocol.serializer.lua;

import com.zfoo.protocol.generate.GenerateProtocolFile;
import com.zfoo.protocol.registration.field.IFieldRegistration;
import com.zfoo.protocol.registration.field.MapField;
import com.zfoo.protocol.serializer.CodeLanguage;
import com.zfoo.protocol.serializer.CutDownMapSerializer;
import com.zfoo.protocol.util.StringUtils;

import java.lang.reflect.Field;

import static com.zfoo.protocol.util.FileUtils.LS;

/**
 * @author godotg
 */
public class LuaMapSerializer implements ILuaSerializer {

    @Override
    public String fieldDefaultValue(Field field, IFieldRegistration fieldRegistration) {
        return "{}";
    }
    @Override
    public void writeObject(StringBuilder builder, String objectStr, int deep, Field field, IFieldRegistration fieldRegistration) {
        GenerateProtocolFile.addTab(builder, deep);
        if (CutDownMapSerializer.getInstance().writeObject(builder, objectStr, field, fieldRegistration, CodeLanguage.Lua)) {
            return;
        }

        MapField mapField = (MapField) fieldRegistration;
        builder.append(StringUtils.format("if {} == null then", objectStr)).append(LS);
        GenerateProtocolFile.addTab(builder, deep + 1);
        builder.append("buffer:writeInt(0)").append(LS);

        GenerateProtocolFile.addTab(builder, deep);
        builder.append("else").append(LS);

        GenerateProtocolFile.addTab(builder, deep + 1);
        builder.append(StringUtils.format("buffer:writeInt(table.mapSize({}))", objectStr)).append(LS);

        String key = "key" + GenerateProtocolFile.localVariableId++;
        String value = "value" + GenerateProtocolFile.localVariableId++;

        GenerateProtocolFile.addTab(builder, deep + 1);
        builder.append(StringUtils.format("for {}, {} in pairs({}) do", key, value, objectStr)).append(LS);
        CodeGenerateLua.luaSerializer(mapField.getMapKeyRegistration().serializer())
                .writeObject(builder, key, deep + 2, field, mapField.getMapKeyRegistration());
        CodeGenerateLua.luaSerializer(mapField.getMapValueRegistration().serializer())
                .writeObject(builder, value, deep + 2, field, mapField.getMapValueRegistration());
        GenerateProtocolFile.addTab(builder, deep + 1);
        builder.append("end").append(LS);
        GenerateProtocolFile.addTab(builder, deep);
        builder.append("end").append(LS);
    }

    @Override
    public String readObject(StringBuilder builder, int deep, Field field, IFieldRegistration fieldRegistration) {
        GenerateProtocolFile.addTab(builder, deep);
        var cutDown = CutDownMapSerializer.getInstance().readObject(builder, field, fieldRegistration, CodeLanguage.Lua);
        if (cutDown != null) {
            return cutDown;
        }

        MapField mapField = (MapField) fieldRegistration;
        String result = "result" + GenerateProtocolFile.localVariableId++;
        builder.append(StringUtils.format("local {} = {}", result)).append(LS);

        GenerateProtocolFile.addTab(builder, deep);
        String size = "size" + GenerateProtocolFile.localVariableId++;
        builder.append(StringUtils.format("local {} = buffer:readInt()", size)).append(LS);

        GenerateProtocolFile.addTab(builder, deep);
        builder.append(StringUtils.format("if {} > 0 then", size)).append(LS);

        String i = "index" + GenerateProtocolFile.localVariableId++;
        GenerateProtocolFile.addTab(builder, deep + 1);
        builder.append(StringUtils.format("for {} = 1, {} do", i, size, i)).append(LS);

        String keyObject = CodeGenerateLua.luaSerializer(mapField.getMapKeyRegistration().serializer())
                .readObject(builder, deep + 2, field, mapField.getMapKeyRegistration());


        String valueObject = CodeGenerateLua.luaSerializer(mapField.getMapValueRegistration().serializer())
                .readObject(builder, deep + 2, field, mapField.getMapValueRegistration());
        GenerateProtocolFile.addTab(builder, deep + 2);

        builder.append(StringUtils.format("{}[{}] = {}", result, keyObject, valueObject)).append(LS);
        GenerateProtocolFile.addTab(builder, deep + 1);
        builder.append("end").append(LS);
        GenerateProtocolFile.addTab(builder, deep);
        builder.append("end").append(LS);

        return result;
    }
}