package rosa

import (
	"path"
	"strings"

	"hakurei.app/internal/pkg"
)

const (
	// jobsE is expression for preferred job count set by [pkg].
	jobsE = `"$` + pkg.EnvJobs + `"`
	// jobsFlagE is expression for flag with preferred job count.
	jobsFlagE = `"-j$` + pkg.EnvJobs + `"`
	// jobsLE is expression for twice of preferred job count set by [pkg].
	jobsLE = `"$(expr ` + jobsE + ` '*' 2)"`
	// jobsLFlagE is expression for flag with double of preferred job count.
	jobsLFlagE = `"-j$(expr ` + jobsE + ` '*' 2)"`
)

// newTar wraps [pkg.NewHTTPGetTar] with a simpler function signature.
func newTar(url, checksum string, compression uint32) pkg.Artifact {
	return pkg.NewHTTPGetTar(nil, url, mustDecode(checksum), compression)
}

// newFromCPAN is a helper for downloading release from CPAN.
func newFromCPAN(author, name, version, checksum string) pkg.Artifact {
	return newTar(
		"https://cpan.metacpan.org/authors/id/"+
			author[:1]+"/"+author[:2]+"/"+author+"/"+
			name+"-"+version+".tar.gz",
		checksum,
		pkg.TarGzip,
	)
}

// newFromGitLab is a helper for downloading source from GitLab.
func newFromGitLab(domain, suffix, ref, checksum string) pkg.Artifact {
	return newTar(
		"https://"+domain+"/"+suffix+"/-/archive/"+
			ref+"/"+path.Base(suffix)+"-"+
			strings.ReplaceAll(ref, "/", "-")+".tar.bz2",
		checksum,
		pkg.TarBzip2,
	)
}

// newFromGitHub is a helper for downloading source from Microsoft Github.
func newFromGitHub(suffix, tag, checksum string) pkg.Artifact {
	return newTar(
		"https://github.com/"+suffix+
			"/archive/refs/tags/"+tag+".tar.gz",
		checksum,
		pkg.TarGzip,
	)
}

// newFromGitHubRelease is a helper for downloading release tarball from
// Microsoft Github.
func newFromGitHubRelease(
	suffix, tag, name, checksum string,
	compression uint32,
) pkg.Artifact {
	return newTar(
		"https://github.com/"+suffix+
			"/releases/download/"+tag+"/"+name,
		checksum,
		compression,
	)
}