package history

import (
	"context"
	"fmt"
)

// SetPinned pins or unpins a persistent session. Pinning is display/order metadata
// only (like the title): both the fixed main session and sub sessions may be pinned,
// and identity/permissions never derive from it. An unknown id returns
// ErrSessionNotFound.
func (s *Store) SetPinned(ctx context.Context, sessionID string, pinned bool) error {
	res, err := s.db.ExecContext(ctx, `UPDATE chat_sessions SET pinned = ? WHERE id = ?`, pinnedValue(pinned), sessionID)
	if err != nil {
		return fmt.Errorf("history: set pinned %s: %w", sessionID, err)
	}
	n, err := res.RowsAffected()
	if err != nil {
		return fmt.Errorf("history: set pinned %s rows: %w", sessionID, err)
	}
	if n == 0 {
		return fmt.Errorf("history: set pinned %s: %w", sessionID, ErrSessionNotFound)
	}
	return nil
}

// pinnedValue maps the boolean to SQLite's 0/1 integer representation.
func pinnedValue(pinned bool) int {
	if pinned {
		return 1
	}
	return 0
}