package delivery

import (
	"strings"
)

// A mesh package is a Go module of a repository of the mesh's forge (ForgeModulePrefix): mesh-sdk's Go module, and an
// owner module's package (novox/hq ADR 0593 §1). The indexer alone reads which packages a module imports, their content
// digests and their latest published versions, and writes them in its state (PublishedPackages, ADR 0593 §2); a build
// writes the version it is asked into its own go.mod and go.sum (StepAsk.Packages).

// ForgeModulePrefix is the module path prefix of the Go modules the mesh's forge serves: a Go module whose path starts
// with it is a mesh package, git.novox.be/novox/<repository>[/<directory of the module in it>].
const ForgeModulePrefix = "git.novox.be/novox/"

// PackageRepository is the repository (<owner>/<name>) a mesh package is published from and the package's directory in
// it ("" for its root); false for a path that is not a forge module's.
func PackageRepository(pkg string) (repository, dir string, ok bool) {
	rest, found := strings.CutPrefix(pkg, ForgeModulePrefix)
	if !found || rest == "" {
		return "", "", false
	}
	name, dir, _ := strings.Cut(rest, "/")
	if name == "" {
		return "", "", false
	}
	return "novox/" + name, dir, true
}