package oidc

import (
	"context"
	"encoding/json"
	"errors"
	"testing"
	"time"

	"github.com/go-jose/go-jose/v4"
	"github.com/h2non/gock"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"github.com/zitadel/oidc/v3/pkg/client/rp"
	"github.com/zitadel/oidc/v3/pkg/oidc"
	"golang.org/x/oauth2"
	"golang.org/x/text/language"

	"github.com/zitadel/zitadel/internal/crypto"
	"github.com/zitadel/zitadel/internal/domain"
	"github.com/zitadel/zitadel/internal/idp"
)

func TestSession_FetchUser(t *testing.T) {
	type fields struct {
		name         string
		issuer       string
		clientID     string
		clientSecret string
		redirectURI  string
		scopes       []string
		userMapper   func(*oidc.UserInfo) idp.User
		httpMock     func(issuer string)
		authURL      string
		code         string
		tokens       *oidc.Tokens[*oidc.IDTokenClaims]
	}
	type want struct {
		err               error
		id                string
		firstName         string
		lastName          string
		displayName       string
		nickName          string
		preferredUsername string
		email             string
		isEmailVerified   bool
		phone             string
		isPhoneVerified   bool
		preferredLanguage language.Tag
		avatarURL         string
		profile           string
	}
	tests := []struct {
		name   string
		fields fields
		opts   []ProviderOpts
		want   want
	}{
		{
			name: "unauthenticated session, error",
			fields: fields{
				name:         "oidc",
				issuer:       "https://issuer.com",
				clientID:     "clientID",
				clientSecret: "clientSecret",
				redirectURI:  "redirectURI",
				scopes:       []string{"openid"},
				userMapper:   DefaultMapper,
				httpMock: func(issuer string) {
					gock.New(issuer).
						Get(oidc.DiscoveryEndpoint).
						Reply(200).
						JSON(&oidc.DiscoveryConfiguration{
							Issuer:                issuer,
							AuthorizationEndpoint: issuer + "/authorize",
							TokenEndpoint:         issuer + "/token",
							UserinfoEndpoint:      issuer + "/userinfo",
						})
					gock.New(issuer).
						Get("/userinfo").
						Reply(200).
						JSON(userinfo())
				},
				authURL: "https://issuer.com/authorize?client_id=clientID&redirect_uri=redirectURI&response_type=code&scope=openid&state=testState",
				tokens:  nil,
			},
			want: want{
				err: ErrCodeMissing,
			},
		},
		{
			name: "userinfo error",
			fields: fields{
				name:         "oidc",
				issuer:       "https://issuer.com",
				clientID:     "clientID",
				clientSecret: "clientSecret",
				redirectURI:  "redirectURI",
				scopes:       []string{"openid"},
				userMapper:   DefaultMapper,
				httpMock: func(issuer string) {
					gock.New(issuer).
						Get(oidc.DiscoveryEndpoint).
						Reply(200).
						JSON(&oidc.DiscoveryConfiguration{
							Issuer:                issuer,
							AuthorizationEndpoint: issuer + "/authorize",
							TokenEndpoint:         issuer + "/token",
							UserinfoEndpoint:      issuer + "/userinfo",
						})
					gock.New(issuer).
						Get("/userinfo").
						Reply(200).
						JSON(userinfo())
				},
				authURL: "https://issuer.com/authorize?client_id=clientID&redirect_uri=redirectURI&response_type=code&scope=openid&state=testState",
				tokens: &oidc.Tokens[*oidc.IDTokenClaims]{
					Token: &oauth2.Token{
						AccessToken: "accessToken",
						TokenType:   oidc.BearerToken,
					},
					IDTokenClaims: oidc.NewIDTokenClaims(
						"https://issuer.com",
						"sub2",
						[]string{"clientID"},
						time.Now().Add(1*time.Hour),
						time.Now().Add(-1*time.Second),
						"nonce",
						"",
						nil,
						"clientID",
						0,
					),
				},
			},
			want: want{
				err: rp.ErrUserInfoSubNotMatching,
			},
		},
		{
			name: "successful fetch",
			fields: fields{
				name:         "oidc",
				issuer:       "https://issuer.com",
				clientID:     "clientID",
				clientSecret: "clientSecret",
				redirectURI:  "redirectURI",
				scopes:       []string{"openid"},
				userMapper:   DefaultMapper,
				httpMock: func(issuer string) {
					gock.New(issuer).
						Get(oidc.DiscoveryEndpoint).
						Reply(200).
						JSON(&oidc.DiscoveryConfiguration{
							Issuer:                issuer,
							AuthorizationEndpoint: issuer + "/authorize",
							TokenEndpoint:         issuer + "/token",
							UserinfoEndpoint:      issuer + "/userinfo",
						})
					gock.New(issuer).
						Get("/userinfo").
						Reply(200).
						JSON(userinfo())
				},
				authURL: "https://issuer.com/authorize?client_id=clientID&redirect_uri=redirectURI&response_type=code&scope=openid&state=testState",
				tokens: &oidc.Tokens[*oidc.IDTokenClaims]{
					Token: &oauth2.Token{
						AccessToken: "accessToken",
						TokenType:   oidc.BearerToken,
					},
					IDTokenClaims: oidc.NewIDTokenClaims(
						"https://issuer.com",
						"sub",
						[]string{"clientID"},
						time.Now().Add(1*time.Hour),
						time.Now().Add(-1*time.Second),
						"nonce",
						"",
						nil,
						"clientID",
						0,
					),
				},
			},
			want: want{
				id:                "sub",
				firstName:         "firstname",
				lastName:          "lastname",
				displayName:       "firstname lastname",
				nickName:          "nickname",
				preferredUsername: "username",
				email:             "email",
				isEmailVerified:   true,
				phone:             "phone",
				isPhoneVerified:   true,
				preferredLanguage: language.English,
				avatarURL:         "picture",
				profile:           "profile",
			},
		},
		{
			name: "use ID token",
			fields: fields{
				name:         "oidc",
				issuer:       "https://issuer.com",
				clientID:     "clientID",
				clientSecret: "clientSecret",
				redirectURI:  "redirectURI",
				scopes:       []string{"openid"},
				userMapper:   DefaultMapper,
				httpMock: func(issuer string) {
					gock.New(issuer).
						Get(oidc.DiscoveryEndpoint).
						Reply(200).
						JSON(&oidc.DiscoveryConfiguration{
							Issuer:                issuer,
							AuthorizationEndpoint: issuer + "/authorize",
							TokenEndpoint:         issuer + "/token",
							UserinfoEndpoint:      issuer + "/userinfo",
						})
				},
				authURL: "https://issuer.com/authorize?client_id=clientID&redirect_uri=redirectURI&response_type=code&scope=openid&state=testState",
				tokens: &oidc.Tokens[*oidc.IDTokenClaims]{
					Token: &oauth2.Token{
						AccessToken: "accessToken",
						TokenType:   oidc.BearerToken,
					},
					IDTokenClaims: func() *oidc.IDTokenClaims {
						claims := oidc.NewIDTokenClaims(
							"https://issuer.com",
							"sub",
							[]string{"clientID"},
							time.Now().Add(1*time.Hour),
							time.Now().Add(-1*time.Second),
							"nonce",
							"",
							nil,
							"clientID",
							0,
						)
						claims.SetUserInfo(userinfo())
						return claims
					}(),
				},
			},
			opts: []ProviderOpts{
				WithIDTokenMapping(),
			},
			want: want{
				id:                "sub",
				firstName:         "firstname",
				lastName:          "lastname",
				displayName:       "firstname lastname",
				nickName:          "nickname",
				preferredUsername: "username",
				email:             "email",
				isEmailVerified:   true,
				phone:             "phone",
				isPhoneVerified:   true,
				preferredLanguage: language.English,
				avatarURL:         "picture",
				profile:           "profile",
			},
		},
		{
			name: "successful fetch with token exchange",
			fields: fields{
				name:         "oidc",
				issuer:       "https://issuer.com",
				clientID:     "clientID",
				clientSecret: "clientSecret",
				redirectURI:  "redirectURI",
				scopes:       []string{"openid"},
				userMapper:   DefaultMapper,
				httpMock: func(issuer string) {
					gock.New(issuer).
						Get(oidc.DiscoveryEndpoint).
						Reply(200).
						JSON(&oidc.DiscoveryConfiguration{
							Issuer:                issuer,
							AuthorizationEndpoint: issuer + "/authorize",
							TokenEndpoint:         issuer + "/token",
							JwksURI:               issuer + "/keys",
							UserinfoEndpoint:      issuer + "/userinfo",
						})
					gock.New(issuer).
						Post("/token").
						BodyString("client_id=clientID&client_secret=clientSecret&code=code&grant_type=authorization_code&redirect_uri=redirectURI").
						Reply(200).
						JSON(tokenResponse(t, issuer))
					gock.New(issuer).
						Get("/keys").
						Reply(200).
						JSON(keys(t))
					gock.New(issuer).
						Get("/userinfo").
						Reply(200).
						JSON(userinfo())
				},
				authURL: "https://issuer.com/authorize?client_id=clientID&redirect_uri=redirectURI&response_type=code&scope=openid&state=testState",
				tokens:  nil,
				code:    "code",
			},
			want: want{
				id:                "sub",
				firstName:         "firstname",
				lastName:          "lastname",
				displayName:       "firstname lastname",
				nickName:          "nickname",
				preferredUsername: "username",
				email:             "email",
				isEmailVerified:   true,
				phone:             "phone",
				isPhoneVerified:   true,
				preferredLanguage: language.English,
				avatarURL:         "picture",
				profile:           "profile",
			},
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			defer gock.Off()
			tt.fields.httpMock(tt.fields.issuer)
			a := assert.New(t)

			provider, err := New(tt.fields.name, tt.fields.issuer, tt.fields.clientID, tt.fields.clientSecret, tt.fields.redirectURI, tt.fields.scopes, tt.fields.userMapper, tt.opts...)
			require.NoError(t, err)

			session := &Session{
				Provider: provider,
				AuthURL:  tt.fields.authURL,
				Code:     tt.fields.code,
				Tokens:   tt.fields.tokens,
			}

			user, err := session.FetchUser(context.Background())
			if tt.want.err != nil && !errors.Is(err, tt.want.err) {
				a.Fail("invalid error", "expected %v, got %v", tt.want.err, err)
			}
			if tt.want.err == nil {
				require.NoError(t, err)
				a.Equal(tt.want.id, user.GetID())
				a.Equal(tt.want.firstName, user.GetFirstName())
				a.Equal(tt.want.lastName, user.GetLastName())
				a.Equal(tt.want.displayName, user.GetDisplayName())
				a.Equal(tt.want.nickName, user.GetNickname())
				a.Equal(tt.want.preferredUsername, user.GetPreferredUsername())
				a.Equal(domain.EmailAddress(tt.want.email), user.GetEmail())
				a.Equal(tt.want.isEmailVerified, user.IsEmailVerified())
				a.Equal(domain.PhoneNumber(tt.want.phone), user.GetPhone())
				a.Equal(tt.want.isPhoneVerified, user.IsPhoneVerified())
				a.Equal(tt.want.preferredLanguage, user.GetPreferredLanguage())
				a.Equal(tt.want.avatarURL, user.GetAvatarURL())
				a.Equal(tt.want.profile, user.GetProfile())
			}
		})
	}
}

func userinfo() *oidc.UserInfo {
	return &oidc.UserInfo{
		Subject: "sub",
		UserInfoProfile: oidc.UserInfoProfile{
			GivenName:         "firstname",
			FamilyName:        "lastname",
			Name:              "firstname lastname",
			Nickname:          "nickname",
			PreferredUsername: "username",
			Locale:            oidc.NewLocale(language.English),
			Picture:           "picture",
			Profile:           "profile",
		},
		UserInfoEmail: oidc.UserInfoEmail{
			Email:         "email",
			EmailVerified: oidc.Bool(true),
		},
		UserInfoPhone: oidc.UserInfoPhone{
			PhoneNumber:         "phone",
			PhoneNumberVerified: true,
		},
	}
}

func tokenResponse(t *testing.T, issuer string) *oidc.AccessTokenResponse {
	claims := oidc.NewIDTokenClaims(
		issuer,
		"sub",
		[]string{"clientID"},
		time.Now().Add(1*time.Hour),
		time.Now().Add(-1*time.Minute),
		"",
		"",
		nil,
		"clientID",
		0,
	)
	privateKey, err := crypto.BytesToPrivateKey([]byte(`-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
`))
	if err != nil {
		t.Fatal(err)
	}
	signer, err := jose.NewSigner(jose.SigningKey{Key: privateKey, Algorithm: "RS256"}, &jose.SignerOptions{})
	if err != nil {
		t.Fatal(err)
	}
	data, err := json.Marshal(claims)
	if err != nil {
		t.Fatal(err)
	}
	jws, err := signer.Sign(data)
	if err != nil {
		t.Fatal(err)
	}
	idToken, err := jws.CompactSerialize()
	if err != nil {
		t.Fatal(err)
	}
	return &oidc.AccessTokenResponse{
		AccessToken:  "accessToken",
		TokenType:    oidc.BearerToken,
		RefreshToken: "",
		ExpiresIn:    3600,
		IDToken:      idToken,
		State:        "testState",
	}
}

func keys(t *testing.T) *jose.JSONWebKeySet {
	privateKey, err := crypto.BytesToPublicKey([]byte(`-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAs38btwb3c7r0tMaQpGvB
mY+mPwMU/LpfuPoC0k2t4RsKp0fv40SMl50CRrHgk395wch8PMPYbl3+8TtYAJuy
rFALIj3Ff1UcKIk0hOH5DDsfh7/q2wFuncTmS6bifYo8CfSq2vDGnM7nZnEvxY/M
fSydZdcmIqlkUpfQmtzExw9+tSe5Dxq6gn5JtlGgLgZGt69r5iMMrTEGhhVAXzNu
MZbmlCoBru+rC8ITlTX/0V1ZcsSbL8tYWhthyu9x6yjo1bH85wiVI4gs0MhU8f2a
+kjL/KGZbR14Ua2eo6tonBZLC5DHWM2TkYXgRCDPufjcgmzN0Lm91E4P8KvBcvly
6QIDAQAB
-----END PUBLIC KEY-----
`))
	if err != nil {
		t.Fatal(err)
	}
	return &jose.JSONWebKeySet{Keys: []jose.JSONWebKey{{Key: privateKey, Algorithm: "RS256", Use: oidc.KeyUseSignature}}}
}