//! 清理过期 Rate Limit 条目 Worker
//!
//! rate_limit_events 表中的持久化条目会无限增长。
//! 此 Worker 定期删除超过 1 小时的旧条目，防止数据库膨胀。

use async_trait::async_trait;
use sqlx::PgPool;
use serde::{Serialize, Deserialize};
use crate::error::SaasResult;
use super::Worker;

#[derive(Debug, Serialize, Deserialize)]
pub struct CleanupRateLimitArgs {
    pub window_secs: u64,
}

pub struct CleanupRateLimitWorker;

#[async_trait]
impl Worker for CleanupRateLimitWorker {
    type Args = CleanupRateLimitArgs;

    fn name(&self) -> &str {
        "cleanup_rate_limit"
    }

    async fn perform(&self, db: &PgPool, args: Self::Args) -> SaasResult<()> {
        let retention_secs = args.window_secs.max(3600); // 至少保留 1 小时

        let result = sqlx::query(
            "DELETE FROM rate_limit_events WHERE created_at < NOW() - ($1 || ' seconds')::interval"
        )
        .bind(retention_secs.to_string())
        .execute(db)
        .await;

        match result {
            Ok(r) => {
                let deleted = r.rows_affected();
                if deleted > 0 {
                    tracing::info!(
                        "[cleanup_rate_limit] Deleted {} expired rate limit events (retention: {}s)",
                        deleted, retention_secs
                    );
                }
            }
            Err(e) => {
                tracing::error!("[cleanup_rate_limit] Failed to clean up rate limit events: {}", e);
            }
        }

        Ok(())
    }
}