var (
	// QualifierKeyPattern describes a valid qualifier key:
	//
	// - The key must be composed only of ASCII letters and numbers, '.',
	//   '-' and '_' (period, dash and underscore).
	// - A key cannot start with a number.
	QualifierKeyPattern = regexp.MustCompile(`^[A-Za-z\.\-_][0-9A-Za-z\.\-_]*$`)
	// TypePattern describes a valid type:
	//
	// - The type must be composed only of ASCII letters and numbers, '.',
	// '+' and '-' (period, plus and dash).
	// - A type cannot start with a number.
	TypePattern = regexp.MustCompile(`^[A-Za-z\.\-\+][0-9A-Za-z\.\-\+]*$`)
)

var (
	// TypeAlpm is a pkg:alpm purl.
	TypeAlpm = "alpm"
	// TypeApk is a pkg:apk purl.
	TypeApk = "apk"
	// TypeBitbucket is a pkg:bitbucket purl.
	TypeBitbucket = "bitbucket"
	// TypeBitnami is a pkg:bitnami purl.
	TypeBitnami = "bitnami"
	// TypeCargo is a pkg:cargo purl.
	TypeCargo = "cargo"
	// TypeCocoapods is a pkg:cocoapods purl.
	TypeCocoapods = "cocoapods"
	// TypeComposer is a pkg:composer purl.
	TypeComposer = "composer"
	// TypeConan is a pkg:conan purl.
	TypeConan = "conan"
	// TypeConda is a pkg:conda purl.
	TypeConda = "conda"
	// TypeCran is a pkg:cran purl.
	TypeCran = "cran"
	// TypeDebian is a pkg:deb purl.
	TypeDebian = "deb"
	// TypeDocker is a pkg:docker purl.
	TypeDocker = "docker"
	// TypeGem is a pkg:gem purl.
	TypeGem = "gem"
	// TypeGeneric is a pkg:generic purl.
	TypeGeneric = "generic"
	// TypeGithub is a pkg:github purl.
	TypeGithub = "github"
	// TypeGolang is a pkg:golang purl.
	TypeGolang = "golang"
	// TypeHackage is a pkg:hackage purl.
	TypeHackage = "hackage"
	// TypeHex is a pkg:hex purl.
	TypeHex = "hex"
	// TypeHuggingface is pkg:huggingface purl.
	TypeHuggingface = "huggingface"
	// TypeMLflow is pkg:mlflow purl.
	TypeMLFlow = "mlflow"
	// TypeMaven is a pkg:maven purl.
	TypeMaven = "maven"
	// TypeNPM is a pkg:npm purl.
	TypeNPM = "npm"
	// TypeNuget is a pkg:nuget purl.
	TypeNuget = "nuget"
	// TypeOCI is a pkg:oci purl
	TypeOCI = "oci"
	// TypePub is a pkg:pub purl.
	TypePub = "pub"
	// TypePyPi is a pkg:pypi purl.
	TypePyPi = "pypi"
	// TypeQPKG is a pkg:qpkg purl.
	TypeQpkg = "qpkg"
	// TypeRPM is a pkg:rpm purl.
	TypeRPM = "rpm"
	// TypeSWID is pkg:swid purl
	TypeSWID = "swid"
	// TypeSwift is pkg:swift purl
	TypeSwift = "swift"

	// KnownTypes is a map of types that are officially supported by the spec.
	// See https://github.com/package-url/purl-spec/blob/master/PURL-TYPES.rst#known-purl-types
	KnownTypes = map[string]struct{}{
		TypeAlpm:        {},
		TypeApk:         {},
		TypeBitbucket:   {},
		TypeBitnami:     {},
		TypeCargo:       {},
		TypeCocoapods:   {},
		TypeComposer:    {},
		TypeConan:       {},
		TypeConda:       {},
		TypeCran:        {},
		TypeDebian:      {},
		TypeDocker:      {},
		TypeGem:         {},
		TypeGeneric:     {},
		TypeGithub:      {},
		TypeGolang:      {},
		TypeHackage:     {},
		TypeHex:         {},
		TypeHuggingface: {},
		TypeMaven:       {},
		TypeMLFlow:      {},
		TypeNPM:         {},
		TypeNuget:       {},
		TypeOCI:         {},
		TypePub:         {},
		TypePyPi:        {},
		TypeQpkg:        {},
		TypeRPM:         {},
		TypeSWID:        {},
		TypeSwift:       {},
	}

	TypeApache      = "apache"
	TypeAndroid     = "android"
	TypeAtom        = "atom"
	TypeBower       = "bower"
	TypeBrew        = "brew"
	TypeBuildroot   = "buildroot"
	TypeCarthage    = "carthage"
	TypeChef        = "chef"
	TypeChocolatey  = "chocolatey"
	TypeClojars     = "clojars"
	TypeCoreos      = "coreos"
	TypeCpan        = "cpan"
	TypeCtan        = "ctan"
	TypeCrystal     = "crystal"
	TypeDrupal      = "drupal"
	TypeDtype       = "dtype"
	TypeDub         = "dub"
	TypeElm         = "elm"
	TypeEclipse     = "eclipse"
	TypeGitea       = "gitea"
	TypeGitlab      = "gitlab"
	TypeGradle      = "gradle"
	TypeGuix        = "guix"
	TypeHaxe        = "haxe"
	TypeHelm        = "helm"
	TypeJulia       = "julia"
	TypeLua         = "lua"
	TypeMelpa       = "melpa"
	TypeMeteor      = "meteor"
	TypeNim         = "nim"
	TypeNix         = "nix"
	TypeOpam        = "opam"
	TypeOpenwrt     = "openwrt"
	TypeOsgi        = "osgi"
	TypeP2          = "p2"
	TypePear        = "pear"
	TypePecl        = "pecl"
	TypePERL6       = "perl6"
	TypePlatformio  = "platformio"
	TypeEbuild      = "ebuild"
	TypePuppet      = "puppet"
	TypeSourceforge = "sourceforge"
	TypeSublime     = "sublime"
	TypeTerraform   = "terraform"
	TypeVagrant     = "vagrant"
	TypeVim         = "vim"
	TypeWORDPRESS   = "wordpress"
	TypeYocto       = "yocto"

	// CandidateTypes is a map of types that are not yet officially supported by the spec,
	// but are being considered for inclusion.
	// See https://github.com/package-url/purl-spec/blob/master/PURL-TYPES.rst#other-candidate-types-to-define
	CandidateTypes = map[string]struct{}{
		TypeApache:      {},
		TypeAndroid:     {},
		TypeAtom:        {},
		TypeBower:       {},
		TypeBrew:        {},
		TypeBuildroot:   {},
		TypeCarthage:    {},
		TypeChef:        {},
		TypeChocolatey:  {},
		TypeClojars:     {},
		TypeCoreos:      {},
		TypeCpan:        {},
		TypeCtan:        {},
		TypeCrystal:     {},
		TypeDrupal:      {},
		TypeDtype:       {},
		TypeDub:         {},
		TypeElm:         {},
		TypeEclipse:     {},
		TypeGitea:       {},
		TypeGitlab:      {},
		TypeGradle:      {},
		TypeGuix:        {},
		TypeHaxe:        {},
		TypeHelm:        {},
		TypeJulia:       {},
		TypeLua:         {},
		TypeMelpa:       {},
		TypeMeteor:      {},
		TypeNim:         {},
		TypeNix:         {},
		TypeOpam:        {},
		TypeOpenwrt:     {},
		TypeOsgi:        {},
		TypeP2:          {},
		TypePear:        {},
		TypePecl:        {},
		TypePERL6:       {},
		TypePlatformio:  {},
		TypeEbuild:      {},
		TypePuppet:      {},
		TypeSourceforge: {},
		TypeSublime:     {},
		TypeTerraform:   {},
		TypeVagrant:     {},
		TypeVim:         {},
		TypeWORDPRESS:   {},
		TypeYocto:       {},
	}
)

type PackageURL struct {
	Type       string
	Namespace  string
	Name       string
	Version    string
	Qualifiers Qualifiers
	Subpath    string
}

type Qualifier struct {
	Key   string
	Value string
}

type Qualifiers []Qualifier