package httpapi

import (
	"context"
	"database/sql"
	"errors"
)

func (s *server) lookupID(ctx context.Context, query string, args ...any) (int64, error) {
	var id int64
	if err := s.ev.QueryRowContext(ctx, query, args...).Scan(&id); err != nil {
		return 0, err
	}
	return id, nil
}

// upsertImportedEntry 按「组别 + 单位 + 运动员」去重；返回 true 表示新建。
func (s *server) upsertImportedEntry(ctx context.Context, in entryDTO) (bool, error) {
	var existing int64
	var err error
	if in.AthleteID != nil {
		err = s.ev.QueryRowContext(ctx,
			`SELECT id FROM entries WHERE category_id = ? AND team_id = ? AND athlete_id = ?`,
			in.CategoryID, in.TeamID, *in.AthleteID).Scan(&existing)
	} else {
		err = s.ev.QueryRowContext(ctx,
			`SELECT id FROM entries WHERE category_id = ? AND team_id = ? AND athlete_id IS NULL`,
			in.CategoryID, in.TeamID).Scan(&existing)
	}

	switch {
	case errors.Is(err, sql.ErrNoRows):
		if _, err := s.ev.ExecContext(ctx,
			`INSERT INTO entries (event_id, category_id, team_id, athlete_id, member_names, bib, seed, status)
			 VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
			in.EventID, in.CategoryID, in.TeamID, nullI64(in.AthleteID), marshalNames(in.MemberNames),
			nullStr(in.Bib), nullStr(in.Seed), orDefault(in.Status, "registered")); err != nil {
			return false, err
		}
		return true, nil
	case err != nil:
		return false, err
	default:
		if _, err := s.ev.ExecContext(ctx,
			`UPDATE entries SET member_names = ?, bib = ?, seed = ?, status = ? WHERE id = ?`,
			marshalNames(in.MemberNames), nullStr(in.Bib), nullStr(in.Seed),
			orDefault(in.Status, "registered"), existing); err != nil {
			return false, err
		}
		return false, nil
	}
}