package com.vetti.common.handle;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;

import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * @author ID
 * @date 2025/9/15 9:32
 */
public class JsonTypeHandler<T> extends BaseTypeHandler<T> {
    private static final ObjectMapper objectMapper = new ObjectMapper();
    private final Class<T> type;

    public JsonTypeHandler(Class<T> type) {
        this.type = type;
    }

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, T parameter, JdbcType jdbcType) throws SQLException {
        try {
            ps.setString(i, objectMapper.writeValueAsString(parameter));
        } catch (JsonProcessingException e) {
            throw new SQLException("Failed to convert object to JSON", e);
        }
    }

    @Override
    public T getNullableResult(ResultSet rs, String columnName) throws SQLException {
        String json = rs.getString(columnName);
        return parseJson(json);
    }

    @Override
    public T getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
        String json = rs.getString(columnIndex);
        return parseJson(json);
    }

    @Override
    public T getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
        String json = cs.getString(columnIndex);
        return parseJson(json);
    }

    private T parseJson(String json) throws SQLException {
        if (json == null) return null;
        try {
            return objectMapper.readValue(json, type);
        } catch (JsonProcessingException e) {
            throw new SQLException("Failed to parse JSON", e);
        }
    }
}
