// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package internal

import (
	"strings"

	"golang.org/x/mod/semver"
)

// TopLevelDomains contains all of the top level domains in the discovery
// database.
var TopLevelDomains = map[string]bool{
	"af":          true,
	"africa":      true,
	"ag":          true,
	"agency":      true,
	"ai":          true,
	"app":         true,
	"ar":          true,
	"as":          true,
	"at":          true,
	"au":          true,
	"beer":        true,
	"berlin":      true,
	"biz":         true,
	"blue":        true,
	"br":          true,
	"build":       true,
	"by":          true,
	"ca":          true,
	"cafe":        true,
	"casa":        true,
	"cc":          true,
	"ch":          true,
	"ci":          true,
	"city":        true,
	"cl":          true,
	"click":       true,
	"cloud":       true,
	"club":        true,
	"cn":          true,
	"co":          true,
	"codes":       true,
	"coffee":      true,
	"com":         true,
	"computer":    true,
	"consulting":  true,
	"coop":        true,
	"cx":          true,
	"cz":          true,
	"de":          true,
	"design":      true,
	"dev":         true,
	"digital":     true,
	"direct":      true,
	"dk":          true,
	"dog":         true,
	"download":    true,
	"earth":       true,
	"edu":         true,
	"ee":          true,
	"engineer":    true,
	"engineering": true,
	"es":          true,
	"eu":          true,
	"farm":        true,
	"fi":          true,
	"fm":          true,
	"fr":          true,
	"fun":         true,
	"fyi":         true,
	"ga":          true,
	"gay":         true,
	"gg":          true,
	"gmbh":        true,
	"gov":         true,
	"gq":          true,
	"gt":          true,
	"haus":        true,
	"host":        true,
	"ht":          true,
	"hu":          true,
	"icu":         true,
	"id":          true,
	"ie":          true,
	"im":          true,
	"in":          true,
	"info":        true,
	"ink":         true,
	"io":          true,
	"ir":          true,
	"is":          true,
	"it":          true,
	"jp":          true,
	"ke":          true,
	"kr":          true,
	"kz":          true,
	"la":          true,
	"land":        true,
	"lgbt":        true,
	"li":          true,
	"life":        true,
	"link":        true,
	"london":      true,
	"lt":          true,
	"lv":          true,
	"me":          true,
	"media":       true,
	"mil":         true,
	"ml":          true,
	"mn":          true,
	"moe":         true,
	"ms":          true,
	"name":        true,
	"nc":          true,
	"net":         true,
	"network":     true,
	"ninja":       true,
	"nl":          true,
	"no":          true,
	"nu":          true,
	"nz":          true,
	"one":         true,
	"online":      true,
	"org":         true,
	"pe":          true,
	"pl":          true,
	"pm":          true,
	"pro":         true,
	"pub":         true,
	"pw":          true,
	"re":          true,
	"red":         true,
	"ren":         true,
	"rip":         true,
	"ro":          true,
	"rocks":       true,
	"ru":          true,
	"run":         true,
	"school":      true,
	"science":     true,
	"se":          true,
	"services":    true,
	"sh":          true,
	"site":        true,
	"sm":          true,
	"software":    true,
	"solutions":   true,
	"space":       true,
	"st":          true,
	"std":         true,
	"studio":      true,
	"study":       true,
	"su":          true,
	"supply":      true,
	"systems":     true,
	"taxi":        true,
	"team":        true,
	"tech":        true,
	"technology":  true,
	"tf":          true,
	"th":          true,
	"tickets":     true,
	"tk":          true,
	"tm":          true,
	"to":          true,
	"today":       true,
	"tools":       true,
	"top":         true,
	"town":        true,
	"trade":       true,
	"tv":          true,
	"tw":          true,
	"ua":          true,
	"uk":          true,
	"us":          true,
	"uz":          true,
	"ve":          true,
	"vip":         true,
	"vn":          true,
	"wang":        true,
	"website":     true,
	"work":        true,
	"works":       true,
	"wtf":         true,
	"xyz":         true,
	"yandex":      true,
	"zone":        true,
}

// IsGoPkgInPathElement reports whether p is an element of a gopkg.in path.
// It returns true if p has "gopkg.in" as a prefix, or the suffix is a major
// version, for example "yaml.v2".
func IsGoPkgInPathElement(p string) bool {
	if strings.HasPrefix(strings.ToLower(p), "gopkg.in") {
		return true
	}
	parts := strings.Split(p, ".")
	if len(parts) <= 1 {
		return false
	}
	maj := parts[len(parts)-1]
	return semver.Major(maj) == maj
}