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package com.alibaba.fastjson2.reader;

import com.alibaba.fastjson2.JSONArray;
import com.alibaba.fastjson2.JSONException;
import com.alibaba.fastjson2.JSONReader;
import com.alibaba.fastjson2.util.Fnv;
import com.alibaba.fastjson2.util.TypeUtils;

import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.function.Function;

public final class ObjectReaderImplListInt64
        implements ObjectReader {
    final Class listType;
    final Class instanceType;
    final long instanceTypeHash;

    public ObjectReaderImplListInt64(Class listType, Class instanceType) {
        this.listType = listType;
        this.instanceType = instanceType;
        this.instanceTypeHash = Fnv.hashCode64(TypeUtils.getTypeName(instanceType));
    }

    @Override
    public Object createInstance(long features) {
        if (instanceType == ArrayList.class) {
            return new ArrayList<>();
        }

        if (instanceType == LinkedList.class) {
            return new LinkedList();
        }

        try {
            return instanceType.newInstance();
        } catch (InstantiationException | IllegalAccessException e) {
            throw new JSONException("create list error, type " + instanceType);
        }
    }

    @Override
    public Object createInstance(Collection collection) {
        Collection list = (Collection) createInstance(0);
        for (Object item : collection) {
            list.add(TypeUtils.toLong(item));
        }
        return list;
    }

    @Override
    public Object readJSONBObject(JSONReader jsonReader, Type fieldType, Object fieldName, long features) {
        if (jsonReader.nextIfNull()) {
            return null;
        }

        Class listType = this.listType;

        ObjectReader objectReader = jsonReader.checkAutoType(listType, instanceTypeHash, features);
        if (objectReader != null) {
            listType = objectReader.getObjectClass();
        }

        Collection list;
        if (listType == ArrayList.class) {
            list = new ArrayList();
        } else if (listType == JSONArray.class) {
            list = new JSONArray();
        } else if (listType != null && listType != this.listType) {
            list = (Collection) objectReader.createInstance(features);
        } else {
            list = (Collection) createInstance(jsonReader.getContext().getFeatures() | features);
        }

        int entryCnt = jsonReader.startArray();
        for (int i = 0; i < entryCnt; ++i) {
            list.add(jsonReader.readInt64());
        }

        if (objectReader != null) {
            Function buildFunction = objectReader.getBuildFunction();
            if (buildFunction != null) {
                list = (Collection) buildFunction.apply(list);
            }
        }

        return list;
    }

    @Override
    public Object readObject(JSONReader jsonReader, Type fieldType, Object fieldName, long features) {
        if (jsonReader.jsonb) {
            return readJSONBObject(jsonReader, fieldType, fieldName, 0);
        }

        if (jsonReader.readIfNull()) {
            return null;
        }

        if (jsonReader.isString()) {
            Collection list = (Collection) createInstance(jsonReader.getContext().getFeatures() | features);
            String str = jsonReader.readString();
            if (str.indexOf(',') != -1) {
                String[] items = str.split(",");
                for (int i = 0; i < items.length; i++) {
                    String item = items[i];
                    list.add(
                            Long.parseLong(item));
                }
            } else {
                list.add(
                        Long.parseLong(str));
            }
            jsonReader.nextIfComma();
            return list;
        }

        boolean set = jsonReader.nextIfSet();

        if (jsonReader.current() != '[') {
            throw new JSONException(jsonReader.info("format error"));
        }
        jsonReader.next();

        Collection list;
        if (set && instanceType == Collection.class) {
            list = new LinkedHashSet();
        } else {
            list = (Collection) createInstance(jsonReader.getContext().getFeatures() | features);
        }

        for (; ; ) {
            if (jsonReader.isEnd()) {
                throw new JSONException(jsonReader.info("illegal input error"));
            }

            if (jsonReader.nextIfArrayEnd()) {
                break;
            }

            list.add(
                    jsonReader.readInt64());
        }

        jsonReader.nextIfComma();

        return list;
    }
}