package cn.iocoder.yudao.framework.common.util.json.databind;

import tools.jackson.core.JacksonException;
import tools.jackson.core.JsonParser;
import tools.jackson.core.JsonToken;
import tools.jackson.databind.DeserializationContext;
import tools.jackson.databind.ValueDeserializer;

import java.time.Instant;
import java.time.LocalDate;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;

/**
 * 基于时间戳的 LocalDate 反序列化器
 * 兼容：数字时间戳、字符串时间戳、日期字符串
 *
 * @author 老五
 */
public class TimestampLocalDateDeserializer extends ValueDeserializer<LocalDate> {

    public static final TimestampLocalDateDeserializer INSTANCE = new TimestampLocalDateDeserializer();

    private static final DateTimeFormatter DEFAULT_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd");

    @Override
    public LocalDate deserialize(JsonParser p, DeserializationContext ctxt) throws JacksonException {
        if (p.currentToken() == JsonToken.VALUE_NUMBER_INT) {
            return LocalDate.ofInstant(Instant.ofEpochMilli(p.getValueAsLong()), ZoneId.systemDefault());
        }
        String text = p.getValueAsString();
        try {
            long millis = Long.parseLong(text);
            return LocalDate.ofInstant(Instant.ofEpochMilli(millis), ZoneId.systemDefault());
        } catch (NumberFormatException e) {
            // 不是纯数字，按日期格式解析
        }
        return LocalDate.parse(text, DEFAULT_FORMATTER);
    }

}