// Package artifact handles downloading and extracting Mithril snapshot artifacts.
// Currently stubs — HTTP range requests, resumable downloads, zstd+tar extraction
// will be implemented in the next pass.
package artifact

import (
	"context"
	"errors"
)

var ErrNotImplemented = errors.New("not yet implemented")

// Download fetches an artifact from one of the supplied locations, choosing
// the first reachable one and storing it at destPath.
// Implementation will do:
//   - parallel range-chunks over HTTP
//   - resume on partial .part file
//   - SHA-256 verification against the snapshot manifest
func Download(ctx context.Context, locations []string, destPath string) error {
	return ErrNotImplemented
}

// Extract decompresses a zstd+tar archive into targetDir.
// Will stream through zstd -> tar reader without buffering the full archive.
func Extract(ctx context.Context, archivePath, targetDir string) error {
	return ErrNotImplemented
}