/*
Copyright 2022 CAcert Inc.
SPDX-License-Identifier: Apache-2.0

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package messages

import (
	"crypto"
	"crypto/ecdsa"
	"crypto/elliptic"
	"crypto/rand"
	"crypto/x509"
	"crypto/x509/pkix"
	"fmt"
	"math/big"
	"strings"
	"testing"
	"time"

	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"git.cacert.org/cacert-gosigner/internal/x509/signing"
)

func TestCommandCode_String(t *testing.T) {
	goodVariants := []struct {
		Name  string
		Value CommandCode
	}{
		{"undefined", CmdUndef},
		{"health", CmdHealth},
		{"fetch-crl", CmdFetchCRL},
	}

	for _, v := range goodVariants {
		t.Run(v.Name, func(t *testing.T) {
			str := v.Value.String()

			assert.NotEmpty(t, str)
		})
	}

	t.Run("unknown", func(t *testing.T) {
		var unknown CommandCode = -1

		str := unknown.String()

		assert.NotEmpty(t, str)
		assert.Equal(t, "unknown -1", str)
	})
}

func TestResponseCode_String(t *testing.T) {
	goodVariants := []struct {
		Name  string
		Value ResponseCode
	}{
		{"undefined", RespUndef},
		{"error", RespError},
		{"health", RespHealth},
		{"fetch-crl", RespFetchCRL},
	}

	for _, v := range goodVariants {
		t.Run(v.Name, func(t *testing.T) {
			str := v.Value.String()

			assert.NotEmpty(t, str)
		})
	}

	t.Run("unknown", func(t *testing.T) {
		var unknown ResponseCode = -2

		str := unknown.String()

		assert.NotEmpty(t, str)
		assert.Equal(t, "unknown -2", str)
	})
}

func TestCommandAnnounce_String(t *testing.T) {
	announce := BuildCommandAnnounce(CmdUndef)

	require.NotNil(t, announce)

	str := announce.String()

	assert.NotEmpty(t, str)
	assert.Contains(t, str, "code")
	assert.Contains(t, str, "id")
	assert.Contains(t, str, "created")
}

func TestResponseAnnounce_String(t *testing.T) {
	announce := BuildResponseAnnounce(RespUndef, uuid.NewString())

	require.NotNil(t, announce)

	str := announce.String()

	assert.NotEmpty(t, str)
	assert.Contains(t, str, "code")
	assert.Contains(t, str, "id")
	assert.Contains(t, str, "created")
}

func TestHealthCommand_String(t *testing.T) {
	command := &HealthCommand{}

	str := command.String()

	assert.Equal(t, "", str)
}

func TestFetchCRLCommand_String(t *testing.T) {
	t.Run("no-last-known", func(t *testing.T) {
		cmd := &FetchCRLCommand{IssuerID: "issuer"}

		str := cmd.String()

		assert.NotEmpty(t, str)
		assert.Contains(t, str, "issuerId")
		assert.NotContains(t, str, "lastKnownId")
		assert.NotContains(t, str, "0x")
	})

	t.Run("with-last-known", func(t *testing.T) {
		cmd := &FetchCRLCommand{
			IssuerID:    "issuer",
			LastKnownID: big.NewInt(255).Bytes(),
		}

		str := cmd.String()

		assert.NotEmpty(t, str)
		assert.Contains(t, str, "issuerId")
		assert.Contains(t, str, "lastKnownId")
		assert.Contains(t, str, "0xff")
	})
}

func TestCAProfile_String(t *testing.T) {
	profiles := []CAProfile{
		{Name: "test-client", UseFor: signing.UsageClient},
		{Name: "test-code", UseFor: signing.UsageCode},
		{Name: "test-ocsp", UseFor: signing.UsageOCSP},
		{Name: "test-org-client", UseFor: signing.UsageOrgClient},
		{Name: "test-org-code", UseFor: signing.UsageOrgCode},
		{Name: "test-org-email", UseFor: signing.UsageOrgEmail},
		{Name: "test-org-person", UseFor: signing.UsageOrgPerson},
		{Name: "test-org-server", UseFor: signing.UsageOrgServer},
		{Name: "test-org-server-client", UseFor: signing.UsageOrgServerClient},
		{Name: "test-person", UseFor: signing.UsagePerson},
		{Name: "test-server", UseFor: signing.UsageServer},
		{Name: "test-server-client", UseFor: signing.UsageServerClient},
	}

	for _, p := range profiles {
		t.Run(p.Name, func(t *testing.T) {
			str := p.String()

			assert.NotEmpty(t, str)
			assert.True(t, strings.HasPrefix(str, "profile['"))
			assert.True(t, strings.HasSuffix(str, "']"))
			assert.Contains(t, str, "': '")
			assert.Contains(t, str, p.Name)
			assert.Contains(t, str, p.UseFor.String())
		})
	}
}

func TestCAInfoCommand_String(t *testing.T) {
	c := CAInfoCommand{Name: "test"}

	str := c.String()

	assert.NotEmpty(t, str)
	assert.Contains(t, str, "test")
	assert.Contains(t, str, "name")
}

func TestCAInfoResponse_String(t *testing.T) {
	_, certBytes := createTestCertificate(t)

	info := CAInfoResponse{
		Name:    "testca",
		Signing: true,
		Profiles: []CAProfile{{
			Name:   "test",
			UseFor: signing.UsageServer,
		}},
		Certificate: certBytes,
	}

	str := info.String()

	assert.NotEmpty(t, str)
	assert.Contains(t, str, fmt.Sprintf("signing=%t", info.Signing))
	assert.Contains(t, str, "certificate name")
	assert.Contains(t, str, "profiles")

	if len(info.Profiles) == 0 {
		assert.Contains(t, str, "[]")
	}
}

func TestHealthInfo_String(t *testing.T) {
	t.Run("no-more-info", func(t *testing.T) {
		i := &HealthInfo{Source: "test1", Healthy: true}

		str := i.String()

		assert.NotEmpty(t, str)
		assert.Contains(t, str, "source")
		assert.Contains(t, str, "healthy")
		assert.Contains(t, str, "true")
		assert.NotContains(t, str, "[")
		assert.NotContains(t, str, "]")
	})

	t.Run("with-more-info", func(t *testing.T) {
		i := &HealthInfo{Source: "test2", Healthy: false, MoreInfo: map[string]string{"foo": "bar", "baz": "boo"}}

		str := i.String()

		assert.NotEmpty(t, str)
		assert.Contains(t, str, "source")
		assert.Contains(t, str, "healthy")
		assert.Contains(t, str, "false")
		assert.Contains(t, str, "['baz': 'boo', 'foo': 'bar']")
	})
}

func TestHealthResponse_String(t *testing.T) {
	t.Run("no-data", func(t *testing.T) {
		r := &HealthResponse{Version: "foo", Healthy: true}

		str := r.String()

		assert.NotEmpty(t, str)
		assert.Contains(t, str, "signer version")
		assert.Contains(t, str, "foo")
		assert.Contains(t, str, "healthy")
		assert.Contains(t, str, "true")
		assert.Contains(t, str, "[]")
	})

	t.Run("with-data", func(t *testing.T) {
		r := &HealthResponse{
			Version: "foo",
			Healthy: false,
			Info: []*HealthInfo{
				{Source: "bar", Healthy: true},
				{Source: "baz", Healthy: false, MoreInfo: map[string]string{
					"alice":  "good",
					"malory": "bad",
				}},
			},
		}

		str := r.String()
		assert.NotEmpty(t, str)
		assert.Contains(t, str, "signer version")
		assert.Contains(t, str, "foo")
		assert.Contains(t, str, "healthy")
		assert.Contains(t, str, "false")
		assert.NotContains(t, str, "[]")
		assert.Contains(t, str, "bar")
		assert.Contains(t, str, "baz")
		assert.Contains(t, str, "alice")
		assert.Contains(t, str, "good")
		assert.Contains(t, str, "malory")
		assert.Contains(t, str, "bad")
	})
}

func TestFetchCRLResponse_String(t *testing.T) {
	t.Run("unchanged", func(t *testing.T) {
		r := &FetchCRLResponse{
			IssuerID:  "deep-thought",
			IsDelta:   false,
			UnChanged: true,
			CRLNumber: big.NewInt(0x42).Bytes(),
		}

		str := r.String()

		assert.NotEmpty(t, str)
		assert.Contains(t, str, "issuer id")
		assert.Contains(t, str, "delta=false")
		assert.Contains(t, str, "unchanged=true")
		assert.Contains(t, str, "CRL number=0x42")
		assert.NotContains(t, str, "delta CRL data")
		assert.NotContains(t, str, "CERTIFICATE REVOCATION LIST")
	})

	t.Run("delta", func(t *testing.T) {
		randomBytes := make([]byte, 100)
		_, _ = rand.Read(randomBytes)

		r := &FetchCRLResponse{
			IssuerID:  "deep-thought",
			IsDelta:   true,
			UnChanged: false,
			CRLData:   randomBytes,
			CRLNumber: big.NewInt(0x42).Bytes(),
		}

		str := r.String()

		assert.NotEmpty(t, str)
		assert.Contains(t, str, "issuer id")
		assert.Contains(t, str, "delta=true")
		assert.Contains(t, str, "unchanged=false")
		assert.Contains(t, str, "CRL number=0x42")
		assert.Contains(t, str, "delta CRL data")
		assert.Contains(t, str, "100 bytes")
		assert.NotContains(t, str, "CERTIFICATE REVOCATION LIST")
	})

	t.Run("bad-crl", func(t *testing.T) {
		randomBytes := make([]byte, 100)
		_, _ = rand.Read(randomBytes)

		r := &FetchCRLResponse{
			IssuerID:  "deep-thought",
			IsDelta:   false,
			UnChanged: false,
			CRLData:   randomBytes,
			CRLNumber: big.NewInt(0x42).Bytes(),
		}

		str := r.String()

		assert.NotEmpty(t, str)
		assert.Contains(t, str, "issuer id")
		assert.Contains(t, str, "delta=false")
		assert.Contains(t, str, "unchanged=false")
		assert.Contains(t, str, "CRL number=0x42")
		assert.NotContains(t, str, "delta CRL data")
		assert.NotContains(t, str, "CERTIFICATE REVOCATION LIST")
		assert.Contains(t, str, "could not parse CRL")
	})

	t.Run("good-crl", func(t *testing.T) {
		keyPair, certBytes := createTestCertificate(t)

		cert, _ := x509.ParseCertificate(certBytes)

		list, _ := x509.CreateRevocationList(rand.Reader, &x509.RevocationList{
			Number:     big.NewInt(0x42),
			Issuer:     cert.Subject,
			ThisUpdate: time.Now(),
			NextUpdate: time.Now().Add(1 * time.Hour),
		}, cert, keyPair)

		r := &FetchCRLResponse{
			IssuerID:  "deep-thought",
			IsDelta:   false,
			UnChanged: false,
			CRLData:   list,
			CRLNumber: big.NewInt(0x42).Bytes(),
		}

		str := r.String()

		assert.NotEmpty(t, str)
		assert.Contains(t, str, "issuer id")
		assert.Contains(t, str, "delta=false")
		assert.Contains(t, str, "unchanged=false")
		assert.Contains(t, str, "CRL number=0x42")
		assert.NotContains(t, str, "delta CRL data")
		assert.Contains(t, str, "CERTIFICATE REVOCATION LIST")
		assert.NotContains(t, str, "could not parse CRL")
	})
}

func createTestCertificate(t *testing.T) (crypto.Signer, []byte) {
	t.Helper()

	keyPair, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)

	require.NoError(t, err)

	certTemplate := &x509.Certificate{
		BasicConstraintsValid: true,
		IsCA:                  true,
		Issuer:                pkix.Name{Country: []string{"un"}, Organization: []string{"Acme Ltd."}, CommonName: "foo CA"},
		KeyUsage:              x509.KeyUsageCRLSign | x509.KeyUsageCertSign,
		MaxPathLen:            0,
		MaxPathLenZero:        false,
		NotAfter:              time.Now().AddDate(5, 0, 0),
		NotBefore:             time.Now(),
		SerialNumber:          big.NewInt(1),
		SignatureAlgorithm:    x509.ECDSAWithSHA256,
		Subject:               pkix.Name{Country: []string{"un"}, Organization: []string{"Acme Ltd."}, CommonName: "foo CA"},
	}

	certBytes, err := x509.CreateCertificate(rand.Reader, certTemplate, certTemplate, keyPair.Public(), keyPair)

	require.NoError(t, err)

	return keyPair, certBytes
}

func TestErrorResponse_String(t *testing.T) {
	r := &ErrorResponse{Message: "kaput"}

	str := r.String()

	assert.NotEmpty(t, str)
	assert.Contains(t, str, "message")
	assert.Contains(t, str, "kaput")
}