package postgres

import (
	"context"
	"encoding/json"
	"time"
)

type EventRow struct {
	EventID string          `json:"event_id"`
	TS      time.Time       `json:"ts"`
	Type    string          `json:"type"`
	Payload json.RawMessage `json:"payload"`
}

func (d *DB) ListRecentEvents(ctx context.Context, limit int) ([]EventRow, error) {
	if limit <= 0 {
		limit = 100
	}
	if limit > 1000 {
		limit = 1000
	}

	rows, err := d.sql.QueryContext(ctx, `
select event_id, ts, type, payload
from events
order by ts desc
limit $1
`, limit)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var out []EventRow
	for rows.Next() {
		var r EventRow
		if err := rows.Scan(&r.EventID, &r.TS, &r.Type, &r.Payload); err != nil {
			return nil, err
		}
		out = append(out, r)
	}
	if err := rows.Err(); err != nil {
		return nil, err
	}
	return out, nil
}