package db

import (
	"time"

	"crypto-miner-server/internal/models"
)

// PurgeHashrateSamplesBefore deletes samples older than cutoff.
func (d *Database) PurgeHashrateSamplesBefore(cutoff time.Time) (int64, error) {
	res, err := d.Exec("DELETE FROM hashrate_samples WHERE timestamp < ?", cutoff)
	if err != nil {
		return 0, err
	}
	return res.RowsAffected()
}

// ListBuildsOlderThan returns build records created before cutoff.
func (d *Database) ListBuildsOlderThan(cutoff time.Time) ([]*models.BuildRecord, error) {
	rows, err := d.Query(`SELECT id, worker_name, server_url, wallet, threads, file_size, file_path, created_at, pool_host, pool_port, pool_tls, pool_pass FROM builds WHERE created_at < ?`, cutoff)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	var out []*models.BuildRecord
	for rows.Next() {
		b := &models.BuildRecord{}
		if err := rows.Scan(&b.ID, &b.WorkerName, &b.ServerURL, &b.Wallet, &b.Threads, &b.FileSize, &b.FilePath, &b.CreatedAt,
			&b.PoolHost, &b.PoolPort, &b.PoolTLS, &b.PoolPass); err != nil {
			return nil, err
		}
		out = append(out, b)
	}
	return out, nil
}

// DeleteBuild removes a build record by id.
func (d *Database) DeleteBuild(id string) error {
	_, err := d.Exec("DELETE FROM builds WHERE id = ?", id)
	return err
}