// Copyright 2021 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package auth

import (
	"testing"

	"code.gitea.io/gitea/models/auth"
	"code.gitea.io/gitea/models/db"
	"code.gitea.io/gitea/models/unittest"
	user_model "code.gitea.io/gitea/models/user"
	"code.gitea.io/gitea/modules/setting"
	"code.gitea.io/gitea/services/auth/source/oauth2"

	"github.com/golang-jwt/jwt/v5"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func createAndParseToken(t *testing.T, grant *auth.OAuth2Grant) *oauth2.OIDCToken {
	signingKey, err := oauth2.CreateJWTSigningKey("HS256", make([]byte, 32))
	require.NoError(t, err)
	assert.NotNil(t, signingKey)

	response, terr := newAccessTokenResponse(db.DefaultContext, grant, signingKey, signingKey)
	assert.Nil(t, terr)
	assert.NotNil(t, response)

	parsedToken, err := jwt.ParseWithClaims(response.IDToken, &oauth2.OIDCToken{}, func(token *jwt.Token) (any, error) {
		assert.NotNil(t, token.Method)
		assert.Equal(t, signingKey.SigningMethod().Alg(), token.Method.Alg())
		return signingKey.VerifyKey(), nil
	})
	require.NoError(t, err)
	assert.True(t, parsedToken.Valid)

	oidcToken, ok := parsedToken.Claims.(*oauth2.OIDCToken)
	assert.True(t, ok)
	assert.NotNil(t, oidcToken)

	return oidcToken
}

func TestNewAccessTokenResponse_OIDCToken(t *testing.T) {
	require.NoError(t, unittest.PrepareTestDatabase())

	grants, err := auth.GetOAuth2GrantsByUserID(db.DefaultContext, 3)
	require.NoError(t, err)
	assert.Len(t, grants, 1)

	// Scopes: openid
	oidcToken := createAndParseToken(t, grants[0])
	assert.Empty(t, oidcToken.Name)
	assert.Empty(t, oidcToken.PreferredUsername)
	assert.Empty(t, oidcToken.Profile)
	assert.Empty(t, oidcToken.Picture)
	assert.Empty(t, oidcToken.Website)
	assert.Empty(t, oidcToken.UpdatedAt)
	assert.Empty(t, oidcToken.Email)
	assert.False(t, oidcToken.EmailVerified)

	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 5})
	grants, err = auth.GetOAuth2GrantsByUserID(db.DefaultContext, user.ID)
	require.NoError(t, err)
	assert.Len(t, grants, 1)

	// Scopes: openid profile email
	oidcToken = createAndParseToken(t, grants[0])
	assert.Equal(t, user.Name, oidcToken.Name)
	assert.Equal(t, user.Name, oidcToken.PreferredUsername)
	assert.Equal(t, user.HTMLURL(), oidcToken.Profile)
	assert.Equal(t, user.AvatarLink(db.DefaultContext), oidcToken.Picture)
	assert.Equal(t, user.Website, oidcToken.Website)
	assert.Equal(t, user.UpdatedUnix, oidcToken.UpdatedAt)
	assert.Equal(t, user.Email, oidcToken.Email)
	assert.Equal(t, user.IsActive, oidcToken.EmailVerified)

	// set DefaultShowFullName to true
	oldDefaultShowFullName := setting.UI.DefaultShowFullName
	setting.UI.DefaultShowFullName = true
	defer func() {
		setting.UI.DefaultShowFullName = oldDefaultShowFullName
	}()

	// Scopes: openid profile email
	oidcToken = createAndParseToken(t, grants[0])
	assert.Equal(t, user.FullName, oidcToken.Name)
	assert.Equal(t, user.Name, oidcToken.PreferredUsername)
	assert.Equal(t, user.HTMLURL(), oidcToken.Profile)
	assert.Equal(t, user.AvatarLink(db.DefaultContext), oidcToken.Picture)
	assert.Equal(t, user.Website, oidcToken.Website)
	assert.Equal(t, user.UpdatedUnix, oidcToken.UpdatedAt)
	assert.Equal(t, user.Email, oidcToken.Email)
	assert.Equal(t, user.IsActive, oidcToken.EmailVerified)
}