package rosa

import (
	"sync"

	"hakurei.app/internal/pkg"
)

// PArtifact is a lazily-initialised [pkg.Artifact] preset.
type PArtifact int

const (
	Autoconf PArtifact = iota
	Bash
	Busybox
	CMake
	Coreutils
	Diffutils
	Gettext
	Git
	Go
	KernelHeaders
	Libffi
	M4
	Make
	Ninja
	Perl
	Patch
	Python
	Rsync
	Zlib

	// _presetEnd is the total number of presets and does not denote a preset.
	_presetEnd
)

var (
	// artifactsF is an array of functions for the result of [PArtifact].
	artifactsF [_presetEnd]func(t Toolchain) pkg.Artifact

	// artifacts stores the result of artifactsF.
	artifacts [_toolchainEnd][len(artifactsF)]pkg.Artifact
	// artifactsOnce is for lazy initialisation of artifacts.
	artifactsOnce [_toolchainEnd][len(artifactsF)]sync.Once
)

// Load returns the resulting [pkg.Artifact] of [PArtifact].
func (t Toolchain) Load(p PArtifact) pkg.Artifact {
	artifactsOnce[t][p].Do(func() {
		artifacts[t][p] = artifactsF[p](t)
	})
	return artifacts[t][p]
}