package api

import (
	"context"
	"database/sql"
	"log"
	"time"
)

func StartArchiver(ctx context.Context, db *sql.DB, archiveAfter time.Duration) {
	ticker := time.NewTicker(15 * time.Minute)
	defer ticker.Stop()

	run := func() {
		cutoff := time.Now().Add(-archiveAfter).Unix()
		res, err := db.ExecContext(ctx,
			`UPDATE alerts SET archived_at = unixepoch()
			 WHERE status = 'resolved'
			   AND archived_at IS NULL
			   AND COALESCE(ends_at, received_at) < ?`, cutoff)
		if err != nil {
			log.Printf("archiver: %v", err)
			return
		}
		if n, _ := res.RowsAffected(); n > 0 {
			log.Printf("archiver: archived %d resolved alert(s)", n)
		}
	}

	run()
	for {
		select {
		case <-ticker.C:
			run()
		case <-ctx.Done():
			return
		}
	}
}