package com.kingdee.eas.custom.perfweb.util;

/**
 * 类名称: ReportTurnoverUtil
 * 功能描述: 流失率报表SQL及计算工具
 * 创建日期: 2026-06-23
 * 作    者: 青梧
 * 版    本: 1.1
 */
public final class ReportTurnoverUtil {

    private ReportTurnoverUtil() {
    }

    /**
     * 追加主动/被动离职过滤条件
     * CFSfbdlz字段：0=主动离职，1=被动离职
     */
    public static void appendPassiveResignFilter(StringBuilder sql, boolean isPassive) {
        if (isPassive) {
            sql.append("AND (entry.CFSfbdlz = 1 OR entry.CFSfbdlz = '1') ");
        } else {
            sql.append("AND (entry.CFSfbdlz IS NULL OR entry.CFSfbdlz = 0 OR entry.CFSfbdlz = '0') ");
        }
    }

    /**
     * 计算平均流失率(百分比)
     * 流失人数 / ((期初人数 + 期末人数) / 2)
     */
    public static double calculateAvgTurnoverRate(int resignCount, int beginCount, int endCount) {
        double avgCount = (beginCount + endCount) / 2.0;
        if (avgCount == 0) {
            return 0.0;
        }
        return (resignCount / avgCount) * 100;
    }

    /**
     * 计算比率
     */
    public static double calculateRatio(int numerator, int denominator) {
        if (denominator == 0) {
            return 0.0;
        }
        return (double) numerator / denominator;
    }

    /**
     * 计算入职率(百分比)
     */
    public static double calculateEntryRate(int newEntryCount, int beginCount, int endCount) {
        return calculateAvgTurnoverRate(newEntryCount, beginCount, endCount);
    }

    /**
     * 链式推算期末在岗：期初 + 入职 - 离职。
     */
    public static int calculateDerivedEndOnDuty(int beginCount, int newEntryCount, int totalResignCount) {
        return beginCount + newEntryCount - totalResignCount;
    }

    /**
     * 合计行YTD比率(百分比)： (累计人数/当前月数) / ((1月期初+当前月期末)/2)。
     */
    public static double calculateSummaryYtdRate(int cumulativeCount, int currentMonth, int janBeginCount,
            int currentMonthEndCount) {
        if (currentMonth <= 0) {
            return 0.0;
        }
        double monthlyAvgNumerator = cumulativeCount / (double) currentMonth;
        double denominator = (janBeginCount + currentMonthEndCount) / 2.0;
        if (denominator == 0) {
            return 0.0;
        }
        return (monthlyAvgNumerator / denominator) * 100;
    }

    /**
     * 格式化为百分比字符串(两位小数)
     */
    public static String formatPercent(double rate) {
        return String.format("%.2f", rate) + "%";
    }

    /**
     * 比率转百分比字符串(两位小数)
     */
    public static String formatRatioPercent(double ratio) {
        return formatPercent(ratio * 100);
    }
}