package iet.ustb.sf.util;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.toolkit.SqlRunner;
import iet.ustb.sf.domain.Target;
import iet.ustb.sf.domain.TargetOption;
import iet.ustb.sf.exception.ErrorCode;
import iet.ustb.sf.exception.MyException;
import iet.ustb.sf.exception.ThrowUtils;
import iet.ustb.sf.mapper.TargetMapper;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Component;

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

/**
 * CheckUtils
 *
 * @author huangge1199
 * @since 2025/8/5 12:43:14
 */
@Component
public class CheckUtils {

    /**
     * 字符串空值验证
     *
     * @param str  字符串
     * @param name 中文名
     */
    public static void checkEmpty(String str, String name) {
        ThrowUtils.throwIf(StringUtils.isEmpty(str), ErrorCode.NULL_ERROR, name + "不能为空！");
    }

    /**
     * 表名验证
     *
     * @param tableName 表名
     */
    public static void checkTableName(String tableName) {
        checkEmpty(tableName, "表名");
        String sql = "SELECT COUNT(1) FROM information_schema.tables " +
                "WHERE table_schema = 'dwops_extension' AND table_name = '" + tableName + "'";
        long cnt = SqlRunner.db().selectCount(sql);
        ThrowUtils.throwIf(cnt <= 0, new RuntimeException("表" + tableName + "不存在！"));
    }

    /**
     * 列名验证
     *
     * @param columns   列名（多个列表以逗号分割）
     * @param tableName 表名
     */
    public static void checkColumns(String columns, String tableName) {
        checkEmpty(columns, "列名");
        String sql = "SELECT " + columns + " FROM " + tableName + " limit 5";
        SqlRunner.db().selectList(sql);
    }

    /**
     * 条件指标验证
     *
     * @param optionList 条件指标集合
     * @param tableName  表名
     */
    public static void checkSearchOption(List<TargetOption> optionList, String tableName) {
        String columns = optionList.stream().map(TargetOption::getColumnName).collect(Collectors.joining(","));
        checkColumns(columns, tableName);
        for (TargetOption option : optionList) {
            checkSingleOption(option);
        }
    }

    /**
     * 单个条件指标
     *
     * @param option 指标
     */
    public static void checkSingleOption(TargetOption option) {
        String columns = option.getColumnName();
        checkEmpty(columns, "列名");
        List<Integer> typeList = Arrays.asList(1, 2, 3);
        ThrowUtils.throwIf(
                !typeList.contains(option.getType()),
                ErrorCode.PARAMS_ERROR,
                columns + "：指标中的类型不对！"
        );
        List<String> funList;
        switch (option.getType()) {
            case 1:
                ThrowUtils.throwIf(
                        StringUtils.isEmpty(option.getFun()),
                        ErrorCode.PARAMS_ERROR,
                        columns + "：日期类型的指标，日期选项不能为空！"
                );
                funList = Arrays.asList("yesterday", "week", "nearlyWeek", "lastWeek", "month", "lastMonth",
                        "nearlyMonth", "product", "lastProduct");
                ThrowUtils.throwIf(
                        !funList.contains(option.getFun()),
                        ErrorCode.PARAMS_ERROR,
                        columns + "：日期类型的指标，日期选项不对！"
                );
                break;
            case 2:
                break;
            case 3:
                ThrowUtils.throwIf(
                        StringUtils.isEmpty(option.getFun()),
                        ErrorCode.PARAMS_ERROR,
                        columns + "：数值类型的指标，符号不能为空！"
                );
                funList = Arrays.asList(">", ">=", "<", "<=", "=", "!=", "between");
                ThrowUtils.throwIf(
                        !funList.contains(option.getFun()),
                        ErrorCode.PARAMS_ERROR,
                        columns + "：数值类型的指标，符号不对！"
                );
                ThrowUtils.throwIf(
                        StringUtils.isEmpty(option.getVal()),
                        ErrorCode.PARAMS_ERROR,
                        columns + "：数值类型的指标，值不能为空！"
                );
                if ("between".equals(option.getFun())) {
                    String[] nums = option.getVal().split(",");
                    ThrowUtils.throwIf(
                            nums.length != 2,
                            ErrorCode.PARAMS_ERROR,
                            columns + "范围条件请输入两个数值！"
                    );
                    try {
                        if (Double.parseDouble(nums[0]) > Double.parseDouble(nums[1])) {
                            throw new MyException(ErrorCode.PARAMS_ERROR, columns + "：范围条件请确保前面的值小于等于后面的值！");
                        }
                    } catch (Exception e) {
                        throw new MyException(ErrorCode.PARAMS_ERROR, columns + "：请传入两个数值！");
                    }
                }
                break;
        }
    }

    /**
     * 结果指标验证
     *
     * @param option    结果指标
     * @param tableName 表名
     */
    public static void checkResultOption(TargetOption option, String tableName) {
        String fun = option.getFun();
        checkEmpty(fun, "函数");
        List<String> funList = Arrays.asList("SUM", "AVG", "MAX", "MIN", "MEDIAN", "COUNT");
        ThrowUtils.throwIf(!funList.contains(fun), ErrorCode.PARAMS_ERROR, "方法错误！");
        checkColumns(option.getColumnName(), tableName);
    }

    /**
     * 保留指定位小数
     *
     * @param value 传入值
     * @param round 保留位数
     * @return 结果值
     */
    public static double roundToDecimalPlaces(Double value, int round) {
        BigDecimal bd = new BigDecimal(value);
        bd = bd.setScale(round, RoundingMode.HALF_UP);
        return bd.doubleValue();
    }

    /**
     * 验证指标名称是否重复
     * @param targetMapper mapper类
     * @param target 指标
     */
    public static void checkTargetNameExist(TargetMapper targetMapper, Target target) {
        QueryWrapper<Target> query = new QueryWrapper<>();
        query.eq("name", target.getName());
        Target nameCheck = targetMapper.selectOne(query);
        boolean bl = nameCheck != null && (target.getId() == null || !nameCheck.getId().equals(target.getId()));
        ThrowUtils.throwIf(bl, ErrorCode.PARAMS_ERROR, "指标名称不能重复！");
    }
}