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package com.alibaba.fastjson2.writer;

import com.alibaba.fastjson2.JSONB;
import com.alibaba.fastjson2.JSONException;
import com.alibaba.fastjson2.JSONWriter;
import com.alibaba.fastjson2.util.Fnv;
import com.alibaba.fastjson2.util.IOUtils;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.lang.reflect.Type;
import java.util.function.Function;
import java.util.zip.GZIPOutputStream;

import static com.alibaba.fastjson2.JSONWriter.Feature.WriteByteArrayAsBase64;

final class ObjectWriterImplInt8ValueArray
        extends ObjectWriterPrimitiveImpl {
    static final ObjectWriterImplInt8ValueArray INSTANCE = new ObjectWriterImplInt8ValueArray(null);
    static final byte[] JSONB_TYPE_NAME_BYTES = JSONB.toBytes("[B");
    static final long JSONB_TYPE_HASH = Fnv.hashCode64("[B");

    private final Function function;

    public ObjectWriterImplInt8ValueArray(Function function) {
        this.function = function;
    }

    @Override
    public void writeJSONB(JSONWriter jsonWriter, Object object, Object fieldName, Type fieldType, long features) {
        if (jsonWriter.isWriteTypeInfo(object, fieldType)) {
            if (object == byte[].class) {
                jsonWriter.writeTypeName(JSONB_TYPE_NAME_BYTES, JSONB_TYPE_HASH);
            } else {
                jsonWriter.writeTypeName(object.getClass().getName());
            }
        }

        byte[] bytes;
        if (function != null && object != null) {
            bytes = function.apply(object);
        } else {
            bytes = (byte[]) object;
        }

        jsonWriter.writeBinary(bytes);
    }

    @Override
    public void write(JSONWriter jsonWriter, Object object, Object fieldName, Type fieldType, long features) {
        if (object == null) {
            jsonWriter.writeArrayNull();
            return;
        }

        byte[] bytes;
        if (function != null) {
            bytes = function.apply(object);
        } else {
            bytes = (byte[]) object;
        }

        String format = jsonWriter.context.getDateFormat();
        if ("millis".equals(format)) {
            format = null;
        }

        if ("gzip".equals(format) || "gzip,base64".equals(format)) {
            GZIPOutputStream gzipOut = null;
            try {
                ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
                if (bytes.length < 512) {
                    gzipOut = new GZIPOutputStream(byteOut, bytes.length);
                } else {
                    gzipOut = new GZIPOutputStream(byteOut);
                }
                gzipOut.write(bytes);
                gzipOut.finish();
                bytes = byteOut.toByteArray();
            } catch (IOException ex) {
                throw new JSONException("write gzipBytes error", ex);
            } finally {
                IOUtils.close(gzipOut);
            }
        }

        if ("base64".equals(format)
                || "gzip,base64".equals(format)
                || (jsonWriter.getFeatures(features) & WriteByteArrayAsBase64.mask) != 0
        ) {
            jsonWriter.writeBase64(bytes);
            return;
        }

        jsonWriter.startArray();
        for (int i = 0; i < bytes.length; i++) {
            if (i != 0) {
                jsonWriter.writeComma();
            }
            jsonWriter.writeInt32(bytes[i]);
        }
        jsonWriter.endArray();
    }
}