package hostfiles

import (
	"context"
	"os"
)

// Seed stages the stopped host's wake state and descriptor-opened files tree.
// The caller owns the descriptor, origin proof and single manifest commit.
func Seed(ctx context.Context, p *Publisher, root *os.File, wake WakeState, skip func(string, bool) bool) (SyncStats, error) {
	if ctx == nil || p == nil || root == nil {
		return SyncStats{}, os.ErrInvalid
	}
	if err := ctx.Err(); err != nil {
		return SyncStats{}, err
	}
	if err := StageWake(ctx, p, wake); err != nil {
		return SyncStats{}, err
	}
	stats, err := SyncDirAt(ctx, p, root, skip)
	if err != nil {
		return stats, err
	}
	if len(stats.Unreadable) != 0 || len(stats.Retry) != 0 || len(stats.Torn) != 0 {
		return stats, os.ErrInvalid
	}
	return stats, nil
}