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package com.alibaba.fastjson2.reader;

import com.alibaba.fastjson2.JSONException;
import com.alibaba.fastjson2.JSONReader;
import com.alibaba.fastjson2.schema.JSONSchema;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.Collections;
import java.util.Map;

class FieldReaderMapMethodReadOnly
        extends FieldReaderObject {
    FieldReaderMapMethodReadOnly(
            String fieldName,
            Type fieldType,
            Class fieldClass,
            int ordinal,
            long features,
            String format,
            JSONSchema schema,
            Method method,
            Field field
    ) {
        super(fieldName, fieldType, fieldClass, ordinal, features, format, null, null, schema, method, field, null);
    }

    @Override
    public ObjectReader getItemObjectReader(JSONReader jsonReader) {
        if (itemReader != null) {
            return itemReader;
        }

        ObjectReader objectReader = getObjectReader(jsonReader);
        if (objectReader instanceof ObjectReaderImplMap) {
            return itemReader = ObjectReaderImplString.INSTANCE;
        }

        if (objectReader instanceof ObjectReaderImplMapTyped) {
            Type valueType = ((ObjectReaderImplMapTyped) objectReader).valueType;
            return itemReader = jsonReader.getObjectReader(valueType);
        }

        return ObjectReaderImplObject.INSTANCE;
    }

    @Override
    public void accept(T object, Object value) {
        if (value == null) {
            return;
        }

        Map map;
        try {
            map = (Map) method.invoke(object);
        } catch (Exception e) {
            throw new JSONException("set " + fieldName + " error", e);
        }

        if (map == Collections.EMPTY_MAP || map == null) {
            return;
        }

        String name = map.getClass().getName();
        if ("java.util.Collections$UnmodifiableMap".equals(name)) {
            return;
        }

        if (schema != null) {
            schema.assertValidate(value);
        }

        map.putAll((Map) value);
    }

    @Override
    public void processExtra(JSONReader jsonReader, Object object) {
        Map map;
        try {
            map = (Map) method.invoke(object);
        } catch (Exception e) {
            throw new JSONException(jsonReader.info("set " + fieldName + " error"), e);
        }

        String name = jsonReader.getFieldName();

        ObjectReader itemObjectReader = getItemObjectReader(jsonReader);
        Object value = itemObjectReader.readObject(jsonReader, getItemType(), fieldName, 0);
        map.put(name, value);
    }

    public void acceptExtra(Object object, String name, Object value) {
        Map map;
        try {
            map = (Map) method.invoke(object);
        } catch (Exception e) {
            throw new JSONException("set " + fieldName + " error");
        }

        map.put(name, value);
    }

    @Override
    public boolean isReadOnly() {
        return true;
    }

    @Override
    public void readFieldValue(JSONReader jsonReader, T object) {
        if (initReader == null) {
            initReader = jsonReader
                    .getContext()
                    .getObjectReader(fieldType);
        }

        Object value;
        if (jsonReader.jsonb) {
            value = initReader.readJSONBObject(jsonReader, getItemType(), fieldName, features);
        } else {
            value = initReader.readObject(jsonReader, getItemType(), fieldName, features);
        }

        accept(object, value);
    }
}