package com.usky.vpp.util;

import com.usky.common.security.utils.SecurityUtils;
import org.springframework.util.StringUtils;

import java.lang.reflect.Method;
import java.time.LocalDateTime;
import java.util.UUID;

/**
 * VPP 审计与编号工具
 */
public final class VppAuditHelper {

    public static final int NOT_DELETED = 0;
    public static final int DELETED = 1;

    private VppAuditHelper() {
    }

    public static void fillCreate(Object entity) {
        LocalDateTime now = LocalDateTime.now();
        invokeSetter(entity, "setCreateTime", now);
        invokeSetter(entity, "setUpdateTime", now);
        invokeSetter(entity, "setDeleteFlag", NOT_DELETED);
        String auditUser = currentUsername();
        if (StringUtils.hasText(auditUser)) {
            invokeSetter(entity, "setCreatedBy", auditUser);
            invokeSetter(entity, "setUpdatedBy", auditUser);
        }
        Integer tenantId = currentTenantId();
        if (tenantId != null) {
            invokeSetter(entity, "setTenantId", tenantId);
        }
    }

    public static void fillUpdate(Object entity) {
        invokeSetter(entity, "setUpdateTime", LocalDateTime.now());
        String auditUser = currentUsername();
        if (StringUtils.hasText(auditUser)) {
            invokeSetter(entity, "setUpdatedBy", auditUser);
        }
    }

    public static void fillSoftDelete(Object entity) {
        invokeSetter(entity, "setDeleteFlag", DELETED);
        invokeSetter(entity, "setDeletedAt", LocalDateTime.now());
        fillUpdate(entity);
    }

    public static boolean isDeleted(Integer deleteFlag) {
        return deleteFlag != null && deleteFlag == DELETED;
    }

    public static String nextApplyNo() {
        return "ACC" + System.currentTimeMillis() + UUID.randomUUID().toString().substring(0, 4).toUpperCase();
    }

    private static String currentUsername() {
        try {
            return SecurityUtils.getUsername();
        } catch (Exception ex) {
            return null;
        }
    }

    private static Integer currentTenantId() {
        try {
            return SecurityUtils.getTenantId();
        } catch (Exception ex) {
            return null;
        }
    }

    private static void invokeSetter(Object entity, String method, Object value) {
        try {
            Method m = entity.getClass().getMethod(method, value.getClass());
            m.invoke(entity, value);
        } catch (Exception ignored) {
            // 部分实体无审计字段时忽略
        }
    }
}