import com.sinolife.mssp.reward.task.domain.TaskInfoExt;

import java.lang.reflect.Field;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 根据实体类生成resultMap 和 更新插入语句
 */
public class DaoTest {
    public static void main(String[] args) {
        // TaskInfoExt.class 指代实体类
        System.out.println(getResultMap(TaskInfoExt.class));
        System.out.println("----------------------------------------------------------------");
        System.out.println(getUpdateSelective(TaskInfoExt.class));
        System.out.println("----------------------------------------------------------------");
        System.out.println(getInsert(TaskInfoExt.class));
        System.out.println("----------------------------------------------------------------");
        System.out.println(getColumns(TaskInfoExt.class));
    }

    private static Pattern humpPattern = Pattern.compile("[A-Z]");

    public static String getUpdateSelective(Class<?> clazz) {

        Object obj = null;
        try {
            obj = clazz.newInstance();
        } catch (Exception e) {
            return "#Exception.反射生成实体异常#";
        }

        String clazzName = clazz.getSimpleName();
        String resultMapId = Character.toLowerCase(clazzName.charAt(0)) + clazzName.substring(1) + "Map";
        String pkgName = clazz.getName();

        StringBuilder resultMap = new StringBuilder();
        resultMap.append("<update id=\"updateSelective\" parameterType=\"");
        resultMap.append(pkgName);
        resultMap.append("\">\n");
        resultMap.append("UPDATE X_TABLE");
        resultMap.append("\n<set>\n");

        Field[] fields = clazz.getDeclaredFields();
        for (Field f : fields) {
            String property = f.getName();
            String javaType = f.getType().getName();
            if ("serialVersionUID".equals(property)) {
                continue;//忽略掉这个属性
            }
            resultMap.append("    <if test=\"");
            resultMap.append(property + "!=null\">\n");
            resultMap.append(property2Column(property).toUpperCase());
            resultMap.append("=#{" + property + ", jdbcType=" + javaType2jdbcType(javaType.toLowerCase()) + "},\n</if>\n");
        }
        resultMap.append("</set>\n");
        resultMap.append("where id = #{id,jdbcType=VARCHAR}\n");
        resultMap.append("</update>");
        return resultMap.toString();
    }

    public static String getInsert(Class<?> clazz) {
        StringBuffer sb = new StringBuffer();

        String text = getUpdateSelective(clazz);
        Pattern p = Pattern.compile("#\\{[^}]+}");
        Matcher m = p.matcher(text);

        while (m.find()) {
            sb.append(m.group()).append(",\n");
        }

        return sb.toString();
    }

    /**
     * 获取表的字段
     * @param clazz
     */
    public static String getColumns(Class<?> clazz) {
        StringBuffer sb = new StringBuffer();
        String text = getResultMap(clazz);
        Pattern p = Pattern.compile("column=[\"\\w\"]+");
        Matcher m = p.matcher(text);
        while (m.find()) {
            Pattern p1 = Pattern.compile("[\"\\w\"]+$");
            Matcher m1 = p1.matcher(m.group());

            while (m1.find()) {
                Pattern p2 = Pattern.compile("[\\w]+");
                Matcher m2 = p2.matcher(m1.group());
                while (m2.find()) {
                    sb.append(m2.group().toUpperCase()).append(",");
                }
            }
        }
        return sb.toString();
    }

    /**
     * 获取ResultMap
     * @param clazz 实体类的Class
     * @return String
     */
    public static String getResultMap(Class<?> clazz) {

        Object obj = null;
        try {
            obj = clazz.newInstance();
        } catch (Exception e) {
            return "#Exception.反射生成实体异常#";
        }

        String clazzName = clazz.getSimpleName();
        String resultMapId = Character.toLowerCase(clazzName.charAt(0)) + clazzName.substring(1) + "Map";
        String pkgName = clazz.getName();

        StringBuilder resultMap = new StringBuilder();
        resultMap.append("<resultMap id=\"");
        resultMap.append(resultMapId);
        resultMap.append("\" type=\"");
        resultMap.append(pkgName);
        resultMap.append("\">\n");

        Field[] fields = clazz.getDeclaredFields();
        for (Field f : fields) {
            String property = f.getName();
            String javaType = f.getType().getName();
            if ("serialVersionUID".equals(property)) {
                continue;//忽略掉这个属性
            }
            resultMap.append("    <result column=\"");
            resultMap.append(property2Column(property).toUpperCase());
            resultMap.append("\" property=\"");
            resultMap.append(property);
            resultMap.append("\" jdbcType=\"");
            resultMap.append(javaType2jdbcType(javaType.toLowerCase()));
            resultMap.append("\" />\n");
        }
        resultMap.append("</resultMap>");
        return resultMap.toString();
    }

    private static String property2Column(String property) {
        Matcher matcher = humpPattern.matcher(property);
        StringBuffer sb = new StringBuffer();
        while (matcher.find()) {
            matcher.appendReplacement(sb, "_" + matcher.group(0).toLowerCase());
        }
        matcher.appendTail(sb);
        return sb.toString();
    }

    private static String javaType2jdbcType(String javaType) {
        if (javaType.contains("string")) {
            return "VARCHAR";
        } else if (javaType.contains("boolean")) {
            return "BIT";
        } else if (javaType.contains("byte")) {
            return "TINYINT";
        } else if (javaType.contains("short")) {
            return "SMALLINT";
        } else if (javaType.contains("int")) {
            return "INTEGER";
        } else if (javaType.contains("long")) {
            return "BIGINT";
        } else if (javaType.contains("double")) {
            return "DOUBLE";
        } else if (javaType.contains("float")) {
            return "REAL";
        } else if (javaType.contains("date")) {
            return "TIMESTAMP";
            //return "DATE";
        } else if (javaType.contains("timestamp")) {
            return "TIMESTAMP";
        } else if (javaType.contains("time")) {
            return "TIME";
        } else if (javaType.contains("bigdecimal")) {
            return "DECIMAL";
        } else {
            return "未知类型";
        }
    }
}