// Package globals holds application-wide metadata (name, version,
// commit) that is populated at build time via linker flags.
package globals

import (
	"regexp"
	"strings"
	"time"
)

// Appname is the application name, populated from main().
var Appname = "vaultik" //nolint:gochecknoglobals // set via -ldflags at build time

// DevVersion is the version a binary reports when it was built without
// git metadata: script/version emits it outside a git checkout, and an
// unstamped `go build` keeps it. goreleaser's snapshot template stamps
// it followed by "-" and the commit it was built from. It is
// deliberately not a number.
const DevVersion = "dev"

// Version is the application version, populated from main().
var Version = DevVersion //nolint:gochecknoglobals // set via -ldflags at build time

// Commit is the git commit hash, populated from main().
var Commit = "unknown" //nolint:gochecknoglobals // set via -ldflags at build time

// CommitDate is the ISO-8601 date of the commit, populated from main().
var CommitDate = "unknown" //nolint:gochecknoglobals // set via -ldflags at build time

// Author identifies the upstream author of vaultik.
const Author = "Jeffrey Paul <sneak@sneak.berlin>"

// Homepage is the canonical URL for vaultik.
const Homepage = "https://sneak.berlin/go/vaultik"

// ReleasesURL is where tagged release artifacts are published.
const ReleasesURL = "https://git.eeqj.de/sneak/vaultik/releases"

// License is the SPDX identifier for the project license.
const License = "MIT"

// Globals contains application-wide configuration and metadata.
type Globals struct {
	Appname    string
	Version    string
	Commit     string
	CommitDate string
	StartTime  time.Time
}

// New creates and returns a new Globals instance initialized with the
// package-level variables.
func New() (*Globals, error) {
	return &Globals{
		Appname:    Appname,
		Version:    Version,
		Commit:     Commit,
		CommitDate: CommitDate,
	}, nil
}

// IsDevVersion reports whether v names a development build rather than
// a release. "dev" and goreleaser's snapshot "dev-<sha>" count, and so
// does what `git describe --tags --always --dirty` gives a make or
// docker build of an untagged commit: the bare short commit, or
// tag-N-gHASH on a commit after a tag. Any version ending in "-dirty"
// counts, a modified checkout of a tag ("v1.0.0-dirty") included.
// A plain tag such as "v1.0.0" or "1.0.0" is a release.
//
// The empty string counts too. Nothing that knows its version reports
// no version, so an empty Version means the stamping failed, and the
// safe reading of "we could not establish that this is a release" is
// that it is not one. The Makefile refuses to build at all in that
// case; this is the second line of defence, for a binary linked by
// something other than the Makefile.
func IsDevVersion(v string) bool {
	if v == "" || v == DevVersion || strings.HasPrefix(v, DevVersion+"-") ||
		strings.HasSuffix(v, "-dirty") {
		return true
	}

	return regexp.MustCompile(`^(.+-[0-9]+-g)?[0-9a-f]+$`).MatchString(v)
}

// shortCommitLen is the number of commit-hash characters ShortCommit keeps.
const shortCommitLen = 12

// ShortCommit returns the first 12 chars of the commit hash, or the
// whole string if it's shorter (e.g. "unknown").
func (g *Globals) ShortCommit() string {
	if len(g.Commit) > shortCommitLen {
		return g.Commit[:shortCommitLen]
	}

	return g.Commit
}