package ssl

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/x509"
	"crypto/x509/pkix"
	"fmt"
	"math/big"
	"testing"
	"time"

	"git.pcux.cn/xuans/Smail/config"
)

func TestCheckSSLCrtInfo(t *testing.T) {
	if err := config.Init(); err != nil {
		t.Fatal(err)
	}

	got, got1, match, err := CheckSSLCrtInfo()

	fmt.Println(got, got1, match, err)
}

func TestCertificateMatchesConfiguredDomainsUsesHostnameVerification(t *testing.T) {
	cert := createCertificateForDomains(t, []string{"example.com", "*.example.com"})
	parsed, err := x509.ParseCertificate(cert)
	if err != nil {
		t.Fatal(err)
	}
	if !certificateMatchesConfiguredDomains(parsed, &config.Config{
		Domain:    "example.com",
		WebDomain: "web.example.com",
		Domains:   []string{"example.com"},
	}) {
		t.Fatal("wildcard certificate did not match configured service domains")
	}
	if certificateMatchesConfiguredDomains(parsed, &config.Config{
		Domain:    "example.com",
		WebDomain: "web.other.example.com",
		Domains:   []string{"example.com"},
	}) {
		t.Fatal("certificate unexpectedly matched a domain outside its wildcard")
	}
}

func createCertificateForDomains(t *testing.T, domains []string) []byte {
	t.Helper()
	key, err := rsa.GenerateKey(rand.Reader, 2048)
	if err != nil {
		t.Fatal(err)
	}
	now := time.Now()
	template := &x509.Certificate{
		SerialNumber:          big.NewInt(1),
		Subject:               pkix.Name{CommonName: domains[0]},
		DNSNames:              domains,
		NotBefore:             now.Add(-time.Hour),
		NotAfter:              now.Add(24 * time.Hour),
		BasicConstraintsValid: true,
		IsCA:                  true,
		KeyUsage:              x509.KeyUsageCertSign | x509.KeyUsageDigitalSignature,
	}
	der, err := x509.CreateCertificate(rand.Reader, template, template, &key.PublicKey, key)
	if err != nil {
		t.Fatal(err)
	}
	return der
}

func TestDNSCertificateRequiresRootAndWildcardCoverage(t *testing.T) {
	for _, test := range []struct {
		name    string
		domains []string
		valid   bool
	}{
		{name: "root and wildcard", domains: []string{"example.com", "*.example.com"}, valid: true},
		{name: "legacy wildcard only", domains: []string{"*.example.com"}},
		{name: "root only", domains: []string{"example.com"}},
	} {
		t.Run(test.name, func(t *testing.T) {
			der := createCertificateForDomains(t, test.domains)
			cert, err := x509.ParseCertificate(der)
			if err != nil {
				t.Fatal(err)
			}
			for _, webDomain := range []string{"example.com", "web.example.com"} {
				cfg := &config.Config{Domain: "example.com", WebDomain: webDomain, SSLType: config.SSLTypeAutoDNS}
				if matched := certificateMatchesConfiguredDomains(cert, cfg); matched != test.valid {
					t.Fatalf("证书覆盖校验结果不符：web=%s matched=%t", webDomain, matched)
				}
			}
		})
	}
}