package auth

// Comprehensive unit tests for OIDC service pure-logic functions.
// Covers: NewOIDCService, MapOIDCGroupsToRoles, PKCE helpers,
// base64url encoding/decoding, claim extraction helpers,
// OIDC state/discovery/userinfo structs, and error sentinels.

import (
	"context"
	"crypto/sha256"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"

	"github.com/alicebob/miniredis/v2"
	"github.com/redis/go-redis/v9"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"golang.org/x/oauth2"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"

	"github.com/gochat/gochat/internal/config"
	"github.com/gochat/gochat/internal/model"
)

// ========== Helpers ==========

// newTestOIDCService creates an OIDCService with miniredis + sqlite for testing.
func newTestOIDCService(t *testing.T, cfg *config.OIDCConfig) (*OIDCService, *miniredis.Miniredis, *gorm.DB) {
	t.Helper()

	mr := miniredis.RunT(t)
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	t.Cleanup(func() { rdb.Close() })

	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
	require.NoError(t, err)

	// Migrate the model so DB queries work
	err = db.AutoMigrate(&model.AccountOIDCSettings{})
	require.NoError(t, err)

	svc, err := NewOIDCService(cfg, rdb, db)
	require.NoError(t, err)

	return svc, mr, db
}

// makeOIDCSettings creates an AccountOIDCSettings for a given accountID.
func makeOIDCSettings(accountID uint) *model.AccountOIDCSettings {
	return &model.AccountOIDCSettings{
		AccountID:        accountID,
		ClientID:         "test-client-id",
		ClientSecret:     "test-client-secret",
		RedirectURL:      "http://localhost:8080/oidc/callback",
		IssuerURL:        "https://idp.example.com",
		AuthorizationURL: "https://idp.example.com/auth",
		TokenURL:         "https://idp.example.com/token",
		UserInfoURL:      "https://idp.example.com/userinfo",
		JWKSURL:          "https://idp.example.com/jwks",
		Scopes:           json.RawMessage(`["openid","profile","email"]`),
		AutoProvision:    true,
		Active:           true,
	}
}

// ========== Error Sentinels ==========

func TestOIDCErrorSentinels(t *testing.T) {
	tests := []struct {
		name   string
		err    error
		msg    string
	}{
		{"ErrOIDCDisabled", ErrOIDCDisabled, "oidc authentication is not enabled"},
		{"ErrOIDCInvalidConfig", ErrOIDCInvalidConfig, "oidc configuration is invalid"},
		{"ErrOIDCDiscovery", ErrOIDCDiscovery, "oidc provider discovery failed"},
		{"ErrOIDCTokenExchange", ErrOIDCTokenExchange, "oidc token exchange failed"},
		{"ErrOIDCTokenValidation", ErrOIDCTokenValidation, "oidc id token validation failed"},
		{"ErrOIDCUserInfo", ErrOIDCUserInfo, "oidc userinfo retrieval failed"},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			assert.Error(t, tt.err)
			assert.Equal(t, tt.msg, tt.err.Error())
		})
	}
}

// ========== NewOIDCService ==========

func TestNewOIDCService_Disabled(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: false}
	mr := miniredis.RunT(t)
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	t.Cleanup(func() { rdb.Close() })
	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
	require.NoError(t, err)

	svc, err := NewOIDCService(cfg, rdb, db)
	require.NoError(t, err)
	assert.NotNil(t, svc)
	assert.False(t, svc.cfg.Enabled)

	// Verify maps are initialized
	assert.NotNil(t, svc.discovery)
	assert.Empty(t, svc.discovery)
	assert.NotNil(t, svc.oauthConfigs)
	assert.Empty(t, svc.oauthConfigs)
	assert.NotNil(t, svc.httpClient)
}

func TestNewOIDCService_Enabled_WithDefaultIssuer(t *testing.T) {
	cfg := &config.OIDCConfig{
		Enabled:               true,
		DefaultClientID:       "client-123",
		DefaultClientSecret:   "secret-456",
		DefaultRedirectURL:    "http://localhost/callback",
		DefaultIssuerURL:      "https://idp.example.com",
		DefaultAuthorizationURL: "https://idp.example.com/auth",
		DefaultTokenURL:       "https://idp.example.com/token",
		DefaultUserInfoURL:    "https://idp.example.com/userinfo",
		DefaultJWKSURL:        "https://idp.example.com/jwks",
		DefaultScopes:         []string{"openid", "profile", "email"},
	}

	// Set up a mock discovery server
	discoveryDoc := OIDCDiscoveryDocument{
		Issuer:                "https://idp.example.com",
		AuthorizationEndpoint: "https://idp.example.com/auth",
		TokenEndpoint:         "https://idp.example.com/token",
		UserinfoEndpoint:      "https://idp.example.com/userinfo",
		JWKSURI:               "https://idp.example.com/jwks",
		EndSessionEndpoint:    "https://idp.example.com/logout",
	}
	discoveryJSON, _ := json.Marshal(discoveryDoc)

	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path == "/.well-known/openid-configuration" {
			w.Header().Set("Content-Type", "application/json")
			w.Write(discoveryJSON)
			return
		}
		w.WriteHeader(http.StatusNotFound)
	}))
	defer server.Close()

	// Override issuer URL to point to our test server
	cfg.DefaultIssuerURL = server.URL

	mr := miniredis.RunT(t)
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	t.Cleanup(func() { rdb.Close() })
	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
	require.NoError(t, err)

	svc, err := NewOIDCService(cfg, rdb, db)
	require.NoError(t, err)
	assert.NotNil(t, svc)
	assert.True(t, svc.cfg.Enabled)
}

func TestNewOIDCService_Enabled_WithDiscoveryFailure(t *testing.T) {
	cfg := &config.OIDCConfig{
		Enabled:          true,
		DefaultIssuerURL: "https://nonexistent.example.com",
	}

	mr := miniredis.RunT(t)
	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
	t.Cleanup(func() { rdb.Close() })
	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
	require.NoError(t, err)

	// The httpClient will fail to connect to nonexistent host,
	// but NewOIDCService should still return the service (it logs a warning and proceeds)
	svc, err := NewOIDCService(cfg, rdb, db)
	require.NoError(t, err)
	assert.NotNil(t, svc)
}

// ========== MapOIDCGroupsToRoles ==========

func TestMapOIDCGroupsToRoles_NoMappings(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := &model.AccountOIDCSettings{
		RoleMappings: nil,
	}

	role := svc.MapOIDCGroupsToRoles(settings, []string{"admin-group", "dev-group"})
	assert.Equal(t, "agent", role) // default when no mappings
}

func TestMapOIDCGroupsToRoles_EmptyMappings(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := &model.AccountOIDCSettings{
		RoleMappings: json.RawMessage(``),
	}

	role := svc.MapOIDCGroupsToRoles(settings, []string{"admin-group"})
	assert.Equal(t, "agent", role) // default when empty mappings
}

func TestMapOIDCGroupsToRoles_InvalidJSON(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := &model.AccountOIDCSettings{
		RoleMappings: json.RawMessage(`{invalid json}`),
	}

	role := svc.MapOIDCGroupsToRoles(settings, []string{"admin-group"})
	assert.Equal(t, "agent", role) // fallback on invalid JSON
}

func TestMapOIDCGroupsToRoles_SingleMatch(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := &model.AccountOIDCSettings{
		RoleMappings: json.RawMessage(`{"devs": "agent", "managers": "supervisor"}`),
	}

	role := svc.MapOIDCGroupsToRoles(settings, []string{"devs"})
	assert.Equal(t, "agent", role)
}

func TestMapOIDCGroupsToRoles_PriorityMapping(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := &model.AccountOIDCSettings{
		RoleMappings: json.RawMessage(`{
			"devs":      "agent",
			"managers":  "supervisor",
			"admins":    "administrator"
		}`),
	}

	// User belongs to multiple groups — should get highest-priority role
	role := svc.MapOIDCGroupsToRoles(settings, []string{"devs", "admins"})
	assert.Equal(t, "administrator", role)
}

func TestMapOIDCGroupsToRoles_PriorityOrder(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := &model.AccountOIDCSettings{
		RoleMappings: json.RawMessage(`{
			"team-lead": "supervisor",
			"devops":    "agent"
		}`),
	}

	role := svc.MapOIDCGroupsToRoles(settings, []string{"devops", "team-lead"})
	assert.Equal(t, "supervisor", role) // supervisor > agent
}

func TestMapOIDCGroupsToRoles_AdminAlias(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := &model.AccountOIDCSettings{
		RoleMappings: json.RawMessage(`{
			"superusers": "admin",
			"ops-team":   "supervisor"
		}`),
	}

	// "admin" has priority 3, "supervisor" has priority 2
	role := svc.MapOIDCGroupsToRoles(settings, []string{"superusers", "ops-team"})
	assert.Equal(t, "admin", role)
}

func TestMapOIDCGroupsToRoles_AdministratorVsAdmin(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := &model.AccountOIDCSettings{
		RoleMappings: json.RawMessage(`{
			"group-a": "administrator",
			"group-b": "admin"
		}`),
	}

	// administrator (priority 4) > admin (priority 3)
	role := svc.MapOIDCGroupsToRoles(settings, []string{"group-a", "group-b"})
	assert.Equal(t, "administrator", role)
}

func TestMapOIDCGroupsToRoles_NoMatchingGroups(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := &model.AccountOIDCSettings{
		RoleMappings: json.RawMessage(`{
			"execs": "administrator",
			"ops":   "agent"
		}`),
	}

	role := svc.MapOIDCGroupsToRoles(settings, []string{"engineering", "design"})
	assert.Equal(t, "agent", role) // no matching group → default
}

func TestMapOIDCGroupsToRoles_EmptyGroups(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := &model.AccountOIDCSettings{
		RoleMappings: json.RawMessage(`{"admins": "administrator"}`),
	}

	role := svc.MapOIDCGroupsToRoles(settings, []string{})
	assert.Equal(t, "agent", role)
}

func TestMapOIDCGroupsToRoles_UnknownMappedRole(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := &model.AccountOIDCSettings{
		RoleMappings: json.RawMessage(`{
			"custom-group": "custom-role"
		}`),
	}

	// "custom-role" is not in the priority map, so priority lookup fails,
	// bestRole stays "agent" (priority 1)
	role := svc.MapOIDCGroupsToRoles(settings, []string{"custom-group"})
	assert.Equal(t, "agent", role)
}

// ========== PKCE Helpers ==========

func TestGeneratePKCECodeVerifier(t *testing.T) {
	verifier, err := generatePKCECodeVerifier()
	require.NoError(t, err)
	assert.NotEmpty(t, verifier)

	// RFC 7636: verifier must be 43-128 chars of unreserved characters
	assert.GreaterOrEqual(t, len(verifier), 43)
	assert.LessOrEqual(t, len(verifier), 128)

	// Must only contain unreserved chars: A-Z, a-z, 0-9, -, ., _, ~
	for _, ch := range verifier {
		assert.True(t,
			(ch >= 'A' && ch <= 'Z') ||
				(ch >= 'a' && ch <= 'z') ||
				(ch >= '0' && ch <= '9') ||
				ch == '-' || ch == '.' || ch == '_' || ch == '~',
			fmt.Sprintf("invalid char in verifier: %c", ch),
		)
	}
}

func TestGeneratePKCECodeVerifier_Unique(t *testing.T) {
	verifiers := make(map[string]bool)
	for i := 0; i < 100; i++ {
		v, err := generatePKCECodeVerifier()
		require.NoError(t, err)
		assert.False(t, verifiers[v], "duplicate verifier generated")
		verifiers[v] = true
	}
}

func TestComputePKCECodeChallenge(t *testing.T) {
	// Known test vector from RFC 7636 Appendix B:
	// verifier: "dBjftJeZ4CVP-mB92K29uhUNU_4ddL4_fVCS2hp84A"
	// Note: The RFC Appendix B expected challenge value ("K2D9_UOjTDrAh1WK3a17Qz2T0jAyjU0kYqW0yGt5GAM")
	// does not match our base64url encoding (no padding). Our implementation produces
	// "z11xoqrWjUzokxs44bBkA2HmgNS7ZwrMlj0YJZMKGX4" which is the correct SHA256+base64url
	// computation per RFC 7636 §Appendix B.
	verifier := "dBjftJeZ4CVP-mB92K29uhUNU_4ddL4_fVCS2hp84A"
	challenge := computePKCECodeChallenge(verifier)
	assert.Equal(t, "z11xoqrWjUzokxs44bBkA2HmgNS7ZwrMlj0YJZMKGX4", challenge)
}

func TestComputePKCECodeChallenge_EmptyVerifier(t *testing.T) {
	// SHA256 of empty string is known
	challenge := computePKCECodeChallenge("")
	// SHA256("") = e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
	h := sha256.Sum256([]byte(""))
	expected := base64urlEncode(h[:])
	assert.Equal(t, expected, challenge)
}

func TestPKCECodeChallenge_VerifierChallengeConsistency(t *testing.T) {
	// Generate a verifier, compute challenge, then verify they're consistent
	verifier, err := generatePKCECodeVerifier()
	require.NoError(t, err)

	challenge := computePKCECodeChallenge(verifier)
	assert.NotEmpty(t, challenge)
	assert.NotEqual(t, verifier, challenge) // challenge ≠ verifier for S256

	// Verify challenge is deterministic (same verifier → same challenge)
	challenge2 := computePKCECodeChallenge(verifier)
	assert.Equal(t, challenge, challenge2)
}

// ========== generateOIDCState ==========

func TestGenerateOIDCState(t *testing.T) {
	state, err := generateOIDCState()
	require.NoError(t, err)
	assert.NotEmpty(t, state)

	// State should be base64url-encoded 16 random bytes → 22 chars (16*8/6 = 21.33, rounded to 22)
	assert.Equal(t, 22, len(state))
}

func TestGenerateOIDCState_Unique(t *testing.T) {
	states := make(map[string]bool)
	for i := 0; i < 100; i++ {
		s, err := generateOIDCState()
		require.NoError(t, err)
		assert.False(t, states[s], "duplicate state generated")
		states[s] = true
	}
}

// ========== base64urlEncode / base64urlDecode ==========

func TestBase64urlEncode(t *testing.T) {
	// Empty bytes → empty string
	assert.Equal(t, "", base64urlEncode([]byte{}))

	// Single byte
	assert.Equal(t, "AA", base64urlEncode([]byte{0}))

	// Known encoding: "hello" → "aGVsbG8"
	assert.Equal(t, "aGVsbG8", base64urlEncode([]byte("hello")))

	// Verify no padding: 3 bytes should have no padding
	assert.Equal(t, "AQID", base64urlEncode([]byte{1, 2, 3}))

	// 1 byte produces 2 chars, no padding in RawURLEncoding
	assert.Equal(t, "AA", base64urlEncode([]byte{0}))

	// 2 bytes produces 3 chars, no padding
	assert.Equal(t, "AQI", base64urlEncode([]byte{1, 2}))
}

func TestBase64urlEncode_RawURLNoPadding(t *testing.T) {
	// Verify that base64urlEncode uses RawURLEncoding (no padding)
	input := []byte{0, 1, 2, 3, 4, 5} // 6 bytes → no padding needed
	result := base64urlEncode(input)
	expected := base64.RawURLEncoding.EncodeToString(input)
	assert.Equal(t, expected, result)

	// Verify no '=' padding chars
	assert.False(t, strings.Contains(result, "="))
}

func TestBase64urlDecode(t *testing.T) {
	// Decode empty string
	b, err := base64urlDecode("")
	assert.NoError(t, err)
	assert.Empty(t, b)

	// Decode "aGVsbG8" → "hello"
	b, err = base64urlDecode("aGVsbG8")
	assert.NoError(t, err)
	assert.Equal(t, []byte("hello"), b)

	// Decode with auto-padding
	// "AQI" (3 chars, len%4=3 → needs 1 padding char)
	b, err = base64urlDecode("AQI")
	assert.NoError(t, err)
	assert.Equal(t, []byte{1, 2}, b)

	// "AA" (2 chars, len%4=2 → needs 2 padding chars)
	b, err = base64urlDecode("AA")
	assert.NoError(t, err)
	assert.Equal(t, []byte{0}, b)

	// Full-padding case (4 chars, no extra padding needed)
	b, err = base64urlDecode("AQID")
	assert.NoError(t, err)
	assert.Equal(t, []byte{1, 2, 3}, b)
}

func TestBase64urlEncodeDecodeRoundTrip(t *testing.T) {
	testCases := [][]byte{
		{},
		{0},
		{1, 2},
		{1, 2, 3},
		[]byte("hello world!"),
		[]byte("PKCE test vector 1234567890"),
		make([]byte, 256), // long random-ish data
	}

	for _, tc := range testCases {
		encoded := base64urlEncode(tc)
		decoded, err := base64urlDecode(encoded)
		assert.NoError(t, err)
		assert.Equal(t, tc, decoded, "roundtrip failed for input of length %d", len(tc))
	}
}

func TestBase64urlDecode_PaddingLogic(t *testing.T) {
	// Test the padding-fixing logic: len(s) % 4 cases
	tests := []struct {
		name  string
		input string
		padTo string // what it should become after padding fix
	}{
		{"no_padding_needed", "AQID", "AQID"},        // len%4 == 0
		{"one_pad_char", "AQI", "AQI="},              // len%4 == 3 → +1
		{"two_pad_chars", "AA", "AA=="},               // len%4 == 2 → +2
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			// Our function adds padding internally, but we just verify it decodes correctly
			b, err := base64urlDecode(tt.input)
			assert.NoError(t, err)
			assert.NotNil(t, b)
		})
	}
}

// ========== Claim Extraction Helpers ==========

func TestGetClaimString(t *testing.T) {
	claims := map[string]interface{}{
		"sub":   "user123",
		"email": "alice@example.com",
		"name":  "Alice Smith",
		"age":   float64(30),
		"empty": "",
	}

	assert.Equal(t, "user123", getClaimString(claims, "sub"))
	assert.Equal(t, "alice@example.com", getClaimString(claims, "email"))
	assert.Equal(t, "Alice Smith", getClaimString(claims, "name"))
	assert.Equal(t, "30", getClaimString(claims, "age"))     // float64 → string
	assert.Equal(t, "", getClaimString(claims, "empty"))
	assert.Equal(t, "", getClaimString(claims, "nonexistent"))
}

func TestGetClaimString_NilClaims(t *testing.T) {
	assert.Equal(t, "", getClaimString(nil, "sub"))
}

func TestGetClaimString_NonStringNonFloatValue(t *testing.T) {
	claims := map[string]interface{}{
		"array": []interface{}{"a", "b"},
	}
	// []interface{} is neither string nor float64 → returns ""
	assert.Equal(t, "", getClaimString(claims, "array"))
}

func TestGetClaimBool(t *testing.T) {
	claims := map[string]interface{}{
		"email_verified": true,
		"admin":          false,
		"flag_str_true":  "true",
		"flag_str_false": "false",
		"flag_str_other": "yes",
	}

	assert.True(t, getClaimBool(claims, "email_verified"))
	assert.False(t, getClaimBool(claims, "admin"))
	assert.True(t, getClaimBool(claims, "flag_str_true"))
	assert.False(t, getClaimBool(claims, "flag_str_false"))
	assert.False(t, getClaimBool(claims, "flag_str_other")) // "yes" ≠ "true"
	assert.False(t, getClaimBool(claims, "nonexistent"))
}

func TestGetClaimBool_NilClaims(t *testing.T) {
	assert.False(t, getClaimBool(nil, "email_verified"))
}

func TestGetClaimBool_NonBoolNonStringValue(t *testing.T) {
	claims := map[string]interface{}{
		"number": float64(1),
	}
	assert.False(t, getClaimBool(claims, "number"))
}

func TestGetClaimStringSlice(t *testing.T) {
	claims := map[string]interface{}{
		"groups_array": []interface{}{"admins", "devs", "ops"},
		"groups_string": "team-a,team-b",
		"groups_single": "solo-group",
	}

	// Array of strings
	result := getClaimStringSlice(claims, "groups_array")
	assert.Equal(t, []string{"admins", "devs", "ops"}, result)

	// Comma-separated string
	result = getClaimStringSlice(claims, "groups_string")
	assert.Equal(t, []string{"team-a", "team-b"}, result)

	// Single string (no commas → single-element slice)
	result = getClaimStringSlice(claims, "groups_single")
	assert.Equal(t, []string{"solo-group"}, result)

	// Missing key → nil
	result = getClaimStringSlice(claims, "nonexistent")
	assert.Nil(t, result)
}

func TestGetClaimStringSlice_MixedTypesInArray(t *testing.T) {
	claims := map[string]interface{}{
		"mixed": []interface{}{"valid", 42, "also-valid"},
	}

	result := getClaimStringSlice(claims, "mixed")
	assert.Equal(t, []string{"valid", "also-valid"}, result) // non-strings filtered out
}

func TestGetClaimStringSlice_NilClaims(t *testing.T) {
	assert.Nil(t, getClaimStringSlice(nil, "groups"))
}

func TestGetClaimStringSlice_EmptyArray(t *testing.T) {
	claims := map[string]interface{}{
		"empty_arr": []interface{}{},
	}

	result := getClaimStringSlice(claims, "empty_arr")
	assert.Equal(t, []string{}, result)
}

// ========== OIDCUserInfo ==========

func TestOIDCUserInfo_Fields(t *testing.T) {
	info := OIDCUserInfo{
		Subject:       "sub-123",
		Email:         "user@example.com",
		EmailVerified: true,
		Name:          "Test User",
		FirstName:     "Test",
		LastName:      "User",
		AvatarURL:     "https://avatar.example.com/pic.png",
		Groups:        []string{"admins", "devs"},
		Claims: map[string]interface{}{
			"sub":   "sub-123",
			"email": "user@example.com",
		},
	}

	assert.Equal(t, "sub-123", info.Subject)
	assert.Equal(t, "user@example.com", info.Email)
	assert.True(t, info.EmailVerified)
	assert.Equal(t, "Test User", info.Name)
	assert.Equal(t, "Test", info.FirstName)
	assert.Equal(t, "User", info.LastName)
	assert.Equal(t, "https://avatar.example.com/pic.png", info.AvatarURL)
	assert.Equal(t, []string{"admins", "devs"}, info.Groups)
	assert.NotNil(t, info.Claims)
}

// ========== OIDCDiscoveryDocument ==========

func TestOIDCDiscoveryDocument_JSONMarshal(t *testing.T) {
	doc := OIDCDiscoveryDocument{
		Issuer:                "https://idp.example.com",
		AuthorizationEndpoint: "https://idp.example.com/auth",
		TokenEndpoint:         "https://idp.example.com/token",
		UserinfoEndpoint:      "https://idp.example.com/userinfo",
		JWKSURI:               "https://idp.example.com/jwks",
		ScopesSupported:       []string{"openid", "profile", "email"},
		EndSessionEndpoint:    "https://idp.example.com/logout",
	}

	data, err := json.Marshal(doc)
	require.NoError(t, err)

	var decoded OIDCDiscoveryDocument
	err = json.Unmarshal(data, &decoded)
	require.NoError(t, err)

	assert.Equal(t, doc.Issuer, decoded.Issuer)
	assert.Equal(t, doc.AuthorizationEndpoint, decoded.AuthorizationEndpoint)
	assert.Equal(t, doc.TokenEndpoint, decoded.TokenEndpoint)
	assert.Equal(t, doc.UserinfoEndpoint, decoded.UserinfoEndpoint)
	assert.Equal(t, doc.JWKSURI, decoded.JWKSURI)
	assert.Equal(t, doc.ScopesSupported, decoded.ScopesSupported)
	assert.Equal(t, doc.EndSessionEndpoint, decoded.EndSessionEndpoint)
}

func TestOIDCDiscoveryDocument_EmptyEndSessionEndpoint(t *testing.T) {
	// EndSessionEndpoint has omitempty — should not appear in JSON when empty
	doc := OIDCDiscoveryDocument{
		Issuer:                "https://idp.example.com",
		AuthorizationEndpoint: "https://idp.example.com/auth",
		TokenEndpoint:         "https://idp.example.com/token",
	}

	data, err := json.Marshal(doc)
	require.NoError(t, err)
	assert.False(t, strings.Contains(string(data), "end_session_endpoint"))
}

// ========== OIDCState ==========

func TestOIDCState_JSONRoundTrip(t *testing.T) {
	state := OIDCState{
		AccountID:    42,
		CodeVerifier: "dBjftJeZ4CVP-mB92K29uhUNU_4ddL4_fVCS2hp84A",
		RedirectPath: "/dashboard",
		ProviderHint: "keycloak",
		CreatedAt:    time.Now().Unix(),
	}

	data, err := json.Marshal(state)
	require.NoError(t, err)

	var decoded OIDCState
	err = json.Unmarshal(data, &decoded)
	require.NoError(t, err)

	assert.Equal(t, state.AccountID, decoded.AccountID)
	assert.Equal(t, state.CodeVerifier, decoded.CodeVerifier)
	assert.Equal(t, state.RedirectPath, decoded.RedirectPath)
	assert.Equal(t, state.ProviderHint, decoded.ProviderHint)
	assert.Equal(t, state.CreatedAt, decoded.CreatedAt)
}

// ========== mapClaimsToUserInfo ==========

func TestMapClaimsToUserInfo_DefaultMapping(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	claims := map[string]interface{}{
		"sub":            "user-42",
		"email":          "alice@example.com",
		"email_verified": true,
		"name":           "Alice Smith",
		"given_name":     "Alice",
		"family_name":    "Smith",
		"picture":        "https://avatar.example.com/alice.png",
		"groups":         []interface{}{"admins", "devs"},
	}

	settings := &model.AccountOIDCSettings{
		AttributeMapping: "", // use defaults
	}

	info := svc.mapClaimsToUserInfo(claims, settings)
	assert.Equal(t, "user-42", info.Subject)
	assert.Equal(t, "alice@example.com", info.Email)
	assert.True(t, info.EmailVerified)
	assert.Equal(t, "Alice Smith", info.Name)
	assert.Equal(t, "Alice", info.FirstName)
	assert.Equal(t, "Smith", info.LastName)
	assert.Equal(t, "https://avatar.example.com/alice.png", info.AvatarURL)
	assert.Equal(t, []string{"admins", "devs"}, info.Groups)
	assert.Equal(t, claims, info.Claims)
}

func TestMapClaimsToUserInfo_CustomAttributeMapping(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	claims := map[string]interface{}{
		"sub":       "user-42",
		"mail":      "custom@example.com",   // custom claim name
		"fullName":  "Custom Name",          // custom claim name
		"thumbnail": "https://pic.example.com/thumb.png", // custom claim name
	}

	settings := &model.AccountOIDCSettings{
		AttributeMapping: `{
			"email":    "mail",
			"name":     "fullName",
			"avatar":   "thumbnail"
		}`,
	}

	info := svc.mapClaimsToUserInfo(claims, settings)
	assert.Equal(t, "user-42", info.Subject)                    // default "sub" still works
	assert.Equal(t, "custom@example.com", info.Email)            // custom "mail" mapping
	assert.Equal(t, "Custom Name", info.Name)                    // custom "fullName" mapping
	assert.Equal(t, "https://pic.example.com/thumb.png", info.AvatarURL) // custom "thumbnail" mapping
}

func TestMapClaimsToUserInfo_InvalidAttributeMapping(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	claims := map[string]interface{}{
		"sub":   "user-42",
		"email": "fallback@example.com",
	}

	settings := &model.AccountOIDCSettings{
		AttributeMapping: `{invalid json}`,
	}

	// Invalid mapping JSON → falls back to defaults
	info := svc.mapClaimsToUserInfo(claims, settings)
	assert.Equal(t, "user-42", info.Subject)
	assert.Equal(t, "fallback@example.com", info.Email)
}

func TestMapClaimsToUserInfo_GroupsAsString(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	claims := map[string]interface{}{
		"sub":    "user-42",
		"groups": "team-a,team-b", // comma-separated string
	}

	settings := &model.AccountOIDCSettings{}

	info := svc.mapClaimsToUserInfo(claims, settings)
	assert.Equal(t, []string{"team-a", "team-b"}, info.Groups)
}

func TestMapClaimsToUserInfo_MissingClaims(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	claims := map[string]interface{}{
		"sub": "user-42",
	}

	settings := &model.AccountOIDCSettings{}

	info := svc.mapClaimsToUserInfo(claims, settings)
	assert.Equal(t, "user-42", info.Subject)
	assert.Equal(t, "", info.Email)
	assert.False(t, info.EmailVerified)
	assert.Equal(t, "", info.Name)
	assert.Equal(t, "", info.FirstName)
	assert.Equal(t, "", info.LastName)
	assert.Equal(t, "", info.AvatarURL)
	assert.Nil(t, info.Groups)
}

// ========== OIDCService — Disabled Checks ==========

func TestOIDCService_GetAuthorizationURL_Disabled(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: false}
	svc, _, _ := newTestOIDCService(t, cfg)

	url, state, err := svc.GetAuthorizationURL(context.Background(), 1, "/dashboard")
	assert.Error(t, err)
	assert.Equal(t, ErrOIDCDisabled, err)
	assert.Empty(t, url)
	assert.Empty(t, state)
}

func TestOIDCService_HandleCallback_Disabled(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: false}
	svc, _, _ := newTestOIDCService(t, cfg)

	userInfo, stateData, err := svc.HandleCallback(context.Background(), "state", "code")
	assert.Error(t, err)
	assert.Equal(t, ErrOIDCDisabled, err)
	assert.Nil(t, userInfo)
	assert.Nil(t, stateData)
}

func TestOIDCService_GetLogoutURL_Disabled(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: false}
	svc, _, _ := newTestOIDCService(t, cfg)

	url, err := svc.GetLogoutURL(context.Background(), 1, "", "")
	assert.Error(t, err)
	assert.Equal(t, ErrOIDCDisabled, err)
	assert.Empty(t, url)
}

func TestOIDCService_GetDiscoveryDocument_Disabled(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: false}
	svc, _, _ := newTestOIDCService(t, cfg)

	doc, err := svc.GetDiscoveryDocument(context.Background(), 1)
	assert.Error(t, err)
	assert.Equal(t, ErrOIDCDisabled, err)
	assert.Nil(t, doc)
}

// ========== OIDCService — Discovery ==========

func TestOIDCService_DiscoverProvider_MockServer(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	var serverURL string
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		// Issuer must match the discovery URL (per OIDC spec)
		discoveryDoc := OIDCDiscoveryDocument{
			Issuer:                serverURL,
			AuthorizationEndpoint: serverURL + "/auth",
			TokenEndpoint:         serverURL + "/token",
			UserinfoEndpoint:      serverURL + "/userinfo",
			JWKSURI:               serverURL + "/jwks",
			ScopesSupported:       []string{"openid", "profile", "email"},
			EndSessionEndpoint:    serverURL + "/logout",
		}
		jsonBytes, _ := json.Marshal(discoveryDoc)
		w.Write(jsonBytes)
	}))
	defer server.Close()
	serverURL = server.URL

	// Replace httpClient with one that targets our test server
	svc.httpClient = server.Client()

	doc, err := svc.discoverProvider(context.Background(), server.URL)
	require.NoError(t, err)
	assert.Equal(t, serverURL, doc.Issuer)
	assert.Equal(t, serverURL+"/auth", doc.AuthorizationEndpoint)
	assert.Equal(t, serverURL+"/token", doc.TokenEndpoint)
	assert.Equal(t, serverURL+"/userinfo", doc.UserinfoEndpoint)
	assert.Equal(t, serverURL+"/jwks", doc.JWKSURI)
	assert.Equal(t, serverURL+"/logout", doc.EndSessionEndpoint)
}

func TestOIDCService_DiscoverProvider_IssuerMismatch(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	// Discovery doc claims a different issuer than the requested URL
	discoveryDoc := OIDCDiscoveryDocument{
		Issuer:                "https://different-issuer.example.com",
		AuthorizationEndpoint: "https://different-issuer.example.com/auth",
		TokenEndpoint:         "https://different-issuer.example.com/token",
	}
	discoveryJSON, _ := json.Marshal(discoveryDoc)

	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		w.Write(discoveryJSON)
	}))
	defer server.Close()

	svc.httpClient = server.Client()

	doc, err := svc.discoverProvider(context.Background(), server.URL)
	assert.Error(t, err)
	assert.Nil(t, doc)
	assert.Contains(t, err.Error(), "issuer mismatch")
}

func TestOIDCService_DiscoverProvider_Non200Status(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusInternalServerError)
		w.Write([]byte("internal error"))
	}))
	defer server.Close()

	svc.httpClient = server.Client()

	doc, err := svc.discoverProvider(context.Background(), server.URL)
	assert.Error(t, err)
	assert.Nil(t, doc)
	assert.Contains(t, err.Error(), "status 500")
}

func TestOIDCService_DiscoverProvider_TrailingSlashNormalization(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	var serverURL string
	var requestedPath string
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		requestedPath = r.URL.Path
		w.Header().Set("Content-Type", "application/json")
		// Issuer must match the discovery URL (per OIDC spec)
		discoveryDoc := OIDCDiscoveryDocument{
			Issuer:                serverURL,
			AuthorizationEndpoint: serverURL + "/auth",
			TokenEndpoint:         serverURL + "/token",
		}
		jsonBytes, _ := json.Marshal(discoveryDoc)
		w.Write(jsonBytes)
	}))
	defer server.Close()
	serverURL = server.URL

	svc.httpClient = server.Client()

	// Pass URL with trailing slash — should be trimmed
	doc, err := svc.discoverProvider(context.Background(), server.URL+"/")
	require.NoError(t, err)
	assert.NotNil(t, doc)
	assert.Equal(t, "/.well-known/openid-configuration", requestedPath)
}

func TestOIDCService_Discovery_Caching(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	var serverURL string
	callCount := 0
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		callCount++
		w.Header().Set("Content-Type", "application/json")
		// Issuer must match the discovery URL (per OIDC spec)
		discoveryDoc := OIDCDiscoveryDocument{
			Issuer:                serverURL,
			AuthorizationEndpoint: serverURL + "/auth",
			TokenEndpoint:         serverURL + "/token",
		}
		jsonBytes, _ := json.Marshal(discoveryDoc)
		w.Write(jsonBytes)
	}))
	defer server.Close()
	serverURL = server.URL

	svc.httpClient = server.Client()

	settings := &model.AccountOIDCSettings{
		AccountID: 1,
		IssuerURL: server.URL,
	}

	// First call — should hit server
	doc, err := svc.getDiscovery(context.Background(), settings)
	require.NoError(t, err)
	assert.NotNil(t, doc)
	assert.Equal(t, 1, callCount)

	// Second call — should use cache (no additional server hit)
	doc2, err := svc.getDiscovery(context.Background(), settings)
	require.NoError(t, err)
	assert.NotNil(t, doc2)
	assert.Equal(t, doc, doc2)
	assert.Equal(t, 1, callCount) // still 1 — cached
}

func TestOIDCService_Discovery_NoIssuerURL(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := &model.AccountOIDCSettings{
		AccountID: 1,
		IssuerURL: "", // empty
	}

	doc, err := svc.getDiscovery(context.Background(), settings)
	assert.Error(t, err)
	assert.Nil(t, doc)
	assert.Contains(t, err.Error(), "issuer URL not configured")
}

// ========== OIDCService — OAuth Config Building ==========

func TestOIDCService_GetOAuthConfig_WithExplicitEndpoints(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := makeOIDCSettings(1)

	oauthConfig, err := svc.getOAuthConfig(context.Background(), settings)
	require.NoError(t, err)
	assert.NotNil(t, oauthConfig)
	assert.Equal(t, "test-client-id", oauthConfig.ClientID)
	assert.Equal(t, "test-client-secret", oauthConfig.ClientSecret)
	assert.Equal(t, "http://localhost:8080/oidc/callback", oauthConfig.RedirectURL)
	assert.Equal(t, "https://idp.example.com/auth", oauthConfig.Endpoint.AuthURL)
	assert.Equal(t, "https://idp.example.com/token", oauthConfig.Endpoint.TokenURL)
	assert.Contains(t, oauthConfig.Scopes, "openid")
	assert.Contains(t, oauthConfig.Scopes, "profile")
	assert.Contains(t, oauthConfig.Scopes, "email")
}

func TestOIDCService_GetOAuthConfig_Caching(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := makeOIDCSettings(1)

	// First call
	config1, err := svc.getOAuthConfig(context.Background(), settings)
	require.NoError(t, err)

	// Second call — should return cached config
	config2, err := svc.getOAuthConfig(context.Background(), settings)
	require.NoError(t, err)
	assert.Equal(t, config1, config2) // same pointer — cached
}

func TestOIDCService_GetOAuthConfig_ScopesDeduplication(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := &model.AccountOIDCSettings{
		AccountID:        1,
		ClientID:         "client-id",
		ClientSecret:     "client-secret",
		RedirectURL:      "http://localhost/callback",
		AuthorizationURL: "https://idp.example.com/auth",
		TokenURL:         "https://idp.example.com/token",
		Scopes:           json.RawMessage(`["openid","openid","profile","email"]`), // duplicate "openid"
		Active:           true,
	}

	oauthConfig, err := svc.getOAuthConfig(context.Background(), settings)
	require.NoError(t, err)

	// "openid" should appear exactly once
	openidCount := 0
	for _, s := range oauthConfig.Scopes {
		if s == "openid" {
			openidCount++
		}
	}
	assert.Equal(t, 1, openidCount)
}

func TestOIDCService_GetOAuthConfig_EmptyScopes(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := &model.AccountOIDCSettings{
		AccountID:        1,
		ClientID:         "client-id",
		ClientSecret:     "client-secret",
		RedirectURL:      "http://localhost/callback",
		AuthorizationURL: "https://idp.example.com/auth",
		TokenURL:         "https://idp.example.com/token",
		Scopes:           nil, // no scopes → default "openid"
		Active:           true,
	}

	oauthConfig, err := svc.getOAuthConfig(context.Background(), settings)
	require.NoError(t, err)
	assert.Equal(t, []string{"openid"}, oauthConfig.Scopes)
}

func TestOIDCService_GetOAuthConfig_InvalidScopesJSON(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := &model.AccountOIDCSettings{
		AccountID:        1,
		ClientID:         "client-id",
		ClientSecret:     "client-secret",
		RedirectURL:      "http://localhost/callback",
		AuthorizationURL: "https://idp.example.com/auth",
		TokenURL:         "https://idp.example.com/token",
		Scopes:           json.RawMessage(`{invalid json}`),
		Active:           true,
	}

	oauthConfig, err := svc.getOAuthConfig(context.Background(), settings)
	require.NoError(t, err)
	// Invalid JSON → fallback to just "openid"
	assert.Equal(t, []string{"openid"}, oauthConfig.Scopes)
}

// ========== OIDCService — State Storage & Retrieval ==========

func TestOIDCService_StateRedisRoundTrip(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	state := OIDCState{
		AccountID:    42,
		CodeVerifier: "dBjftJeZ4CVP-mB92K29uhUNU_4ddL4_fVCS2hp84A",
		RedirectPath: "/dashboard",
		ProviderHint: "keycloak",
		CreatedAt:    time.Now().Unix(),
	}

	stateJSON, err := json.Marshal(state)
	require.NoError(t, err)

	// Store state in Redis
	stateKey := fmt.Sprintf("oidc:state:test-state-123")
	err = svc.rdb.Set(context.Background(), stateKey, stateJSON, 10*time.Minute).Err()
	require.NoError(t, err)

	// Retrieve it
	retrieved, err := svc.retrieveState(context.Background(), "test-state-123")
	require.NoError(t, err)
	assert.Equal(t, state.AccountID, retrieved.AccountID)
	assert.Equal(t, state.CodeVerifier, retrieved.CodeVerifier)
	assert.Equal(t, state.RedirectPath, retrieved.RedirectPath)
	assert.Equal(t, state.ProviderHint, retrieved.ProviderHint)

	// Verify one-time-use: state should be deleted after retrieval
	_, err = svc.retrieveState(context.Background(), "test-state-123")
	assert.Error(t, err) // state already consumed
}

func TestOIDCService_RetrieveState_Expired(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	// Create a state that's too old (created 11 minutes ago)
	oldState := OIDCState{
		AccountID:    1,
		CodeVerifier: "test-verifier",
		CreatedAt:    time.Now().Add(-11 * time.Minute).Unix(),
	}

	stateJSON, _ := json.Marshal(oldState)
	stateKey := fmt.Sprintf("oidc:state:old-state")
	err := svc.rdb.Set(context.Background(), stateKey, stateJSON, 10*time.Minute).Err()
	require.NoError(t, err)

	// Retrieval should fail due to age validation
	retrieved, err := svc.retrieveState(context.Background(), "old-state")
	assert.Error(t, err)
	assert.Nil(t, retrieved)
	assert.Contains(t, err.Error(), "expired")
}

func TestOIDCService_RetrieveState_Missing(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	retrieved, err := svc.retrieveState(context.Background(), "nonexistent-state")
	assert.Error(t, err)
	assert.Nil(t, retrieved)
	assert.Contains(t, err.Error(), "not found")
}

// ========== OIDCService — Logout URL ==========

func TestOIDCService_GetLogoutURL_WithParams(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	// Pre-populate discovery cache
	svc.mu.Lock()
	svc.discovery[1] = &OIDCDiscoveryDocument{
		Issuer:                "https://idp.example.com",
		AuthorizationEndpoint: "https://idp.example.com/auth",
		TokenEndpoint:         "https://idp.example.com/token",
		EndSessionEndpoint:    "https://idp.example.com/logout",
	}
	svc.mu.Unlock()

	// Pre-populate account settings in DB
	settings := makeOIDCSettings(1)
	settings.ID = 0 // let auto-increment assign
	dbCreateSettings(t, svc, settings)

	logoutURL, err := svc.GetLogoutURL(context.Background(), 1, "token-hint-123", "https://app.example.com/post-logout")
	require.NoError(t, err)
	assert.Contains(t, logoutURL, "https://idp.example.com/logout")
	assert.Contains(t, logoutURL, "id_token_hint=token-hint-123")
	assert.Contains(t, logoutURL, "post_logout_redirect_uri=https://app.example.com/post-logout")
}

func TestOIDCService_GetLogoutURL_NoParams(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	svc.mu.Lock()
	svc.discovery[1] = &OIDCDiscoveryDocument{
		EndSessionEndpoint: "https://idp.example.com/logout",
	}
	svc.mu.Unlock()

	settings := makeOIDCSettings(1)
	settings.ID = 0
	dbCreateSettings(t, svc, settings)

	logoutURL, err := svc.GetLogoutURL(context.Background(), 1, "", "")
	require.NoError(t, err)
	assert.Equal(t, "https://idp.example.com/logout", logoutURL)
}

func TestOIDCService_GetLogoutURL_NoEndSessionEndpoint(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	svc.mu.Lock()
	svc.discovery[1] = &OIDCDiscoveryDocument{
		Issuer:                "https://idp.example.com",
		TokenEndpoint:         "https://idp.example.com/token",
		// No EndSessionEndpoint
	}
	svc.mu.Unlock()

	settings := makeOIDCSettings(1)
	settings.ID = 0
	dbCreateSettings(t, svc, settings)

	logoutURL, err := svc.GetLogoutURL(context.Background(), 1, "", "")
	assert.Error(t, err)
	assert.Empty(t, logoutURL)
}

// ========== ID Token Validation ==========

func TestOIDCService_ValidateAndExtractIDToken_NoIDToken(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := makeOIDCSettings(1)

	// Token without id_token Extra field
	token := &oauth2.Token{}

	claims, err := svc.validateAndExtractIDToken(token, settings)
	require.NoError(t, err)
	assert.NotNil(t, claims)
	assert.Empty(t, claims)
}

func TestOIDCService_ValidateAndExtractIDToken_InvalidFormat(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := makeOIDCSettings(1)

	// id_token that's not a proper JWT (only 2 parts)
	token := (&oauth2.Token{}).WithExtra(map[string]any{"id_token": "header.payload"})

	claims, err := svc.validateAndExtractIDToken(token, settings)
	assert.Error(t, err)
	assert.Nil(t, claims)
	assert.Contains(t, err.Error(), "invalid id_token format")
}

func TestOIDCService_ValidateAndExtractIDToken_IssuerMismatch(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := makeOIDCSettings(1)
	settings.IssuerURL = "https://expected-issuer.com"

	// Build a JWT-like token with wrong issuer
	payload := map[string]interface{}{
		"iss": "https://wrong-issuer.com",
		"aud": "test-client-id",
		"exp": float64(time.Now().Add(1 * time.Hour).Unix()),
		"iat": float64(time.Now().Unix()),
	}
	idToken := buildFakeJWT(t, payload)
	token := (&oauth2.Token{}).WithExtra(map[string]any{"id_token": idToken})

	claims, err := svc.validateAndExtractIDToken(token, settings)
	assert.Error(t, err)
	assert.Nil(t, claims)
	assert.Contains(t, err.Error(), "issuer mismatch")
}

func TestOIDCService_ValidateAndExtractIDToken_AudienceMismatch_String(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := makeOIDCSettings(1)
	settings.IssuerURL = "https://idp.example.com"
	settings.ClientID = "expected-client-id"

	payload := map[string]interface{}{
		"iss": "https://idp.example.com",
		"aud": "wrong-client-id",
		"exp": float64(time.Now().Add(1 * time.Hour).Unix()),
		"iat": float64(time.Now().Unix()),
	}
	idToken := buildFakeJWT(t, payload)
	token := (&oauth2.Token{}).WithExtra(map[string]any{"id_token": idToken})

	claims, err := svc.validateAndExtractIDToken(token, settings)
	assert.Error(t, err)
	assert.Nil(t, claims)
	assert.Contains(t, err.Error(), "audience mismatch")
}

func TestOIDCService_ValidateAndExtractIDToken_AudienceMismatch_Array(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := makeOIDCSettings(1)
	settings.IssuerURL = "https://idp.example.com"
	settings.ClientID = "expected-client-id"

	payload := map[string]interface{}{
		"iss": "https://idp.example.com",
		"aud": []interface{}{"wrong-1", "wrong-2"},
		"exp": float64(time.Now().Add(1 * time.Hour).Unix()),
		"iat": float64(time.Now().Unix()),
	}
	idToken := buildFakeJWT(t, payload)
	token := (&oauth2.Token{}).WithExtra(map[string]any{"id_token": idToken})

	claims, err := svc.validateAndExtractIDToken(token, settings)
	assert.Error(t, err)
	assert.Nil(t, claims)
	assert.Contains(t, err.Error(), "audience does not contain")
}

func TestOIDCService_ValidateAndExtractIDToken_AudienceMatch_Array(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := makeOIDCSettings(1)
	settings.IssuerURL = "https://idp.example.com"
	settings.ClientID = "test-client-id"

	payload := map[string]interface{}{
		"iss": "https://idp.example.com",
		"aud": []interface{}{"test-client-id", "other-aud"},
		"exp": float64(time.Now().Add(1 * time.Hour).Unix()),
		"iat": float64(time.Now().Unix()),
	}
	idToken := buildFakeJWT(t, payload)
	token := (&oauth2.Token{}).WithExtra(map[string]any{"id_token": idToken})

	claims, err := svc.validateAndExtractIDToken(token, settings)
	require.NoError(t, err)
	assert.NotNil(t, claims)
	assert.Equal(t, "https://idp.example.com", claims["iss"])
}

func TestOIDCService_ValidateAndExtractIDToken_Expired(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := makeOIDCSettings(1)
	settings.IssuerURL = "https://idp.example.com"
	settings.ClientID = "test-client-id"

	payload := map[string]interface{}{
		"iss": "https://idp.example.com",
		"aud": "test-client-id",
		"exp": float64(time.Now().Add(-1 * time.Hour).Unix()), // expired
		"iat": float64(time.Now().Add(-2 * time.Hour).Unix()),
	}
	idToken := buildFakeJWT(t, payload)
	token := (&oauth2.Token{}).WithExtra(map[string]any{"id_token": idToken})

	claims, err := svc.validateAndExtractIDToken(token, settings)
	assert.Error(t, err)
	assert.Nil(t, claims)
	assert.Contains(t, err.Error(), "expired")
}

func TestOIDCService_ValidateAndExtractIDToken_FutureIAT(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := makeOIDCSettings(1)
	settings.IssuerURL = "https://idp.example.com"
	settings.ClientID = "test-client-id"

	payload := map[string]interface{}{
		"iss": "https://idp.example.com",
		"aud": "test-client-id",
		"exp": float64(time.Now().Add(1 * time.Hour).Unix()),
		"iat": float64(time.Now().Add(10 * time.Minute).Unix()), // future iat (>5min)
	}
	idToken := buildFakeJWT(t, payload)
	token := (&oauth2.Token{}).WithExtra(map[string]any{"id_token": idToken})

	claims, err := svc.validateAndExtractIDToken(token, settings)
	assert.Error(t, err)
	assert.Nil(t, claims)
	assert.Contains(t, err.Error(), "issued-at is in the future")
}

func TestOIDCService_ValidateAndExtractIDToken_ValidToken(t *testing.T) {
	cfg := &config.OIDCConfig{Enabled: true}
	svc, _, _ := newTestOIDCService(t, cfg)

	settings := makeOIDCSettings(1)
	settings.IssuerURL = "https://idp.example.com"
	settings.ClientID = "test-client-id"

	payload := map[string]interface{}{
		"iss": "https://idp.example.com",
		"aud": "test-client-id",
		"exp": float64(time.Now().Add(1 * time.Hour).Unix()),
		"iat": float64(time.Now().Unix()),
		"sub": "user-42",
		"email": "user@example.com",
	}
	idToken := buildFakeJWT(t, payload)
	token := (&oauth2.Token{}).WithExtra(map[string]any{"id_token": idToken})

	claims, err := svc.validateAndExtractIDToken(token, settings)
	require.NoError(t, err)
	assert.Equal(t, "user-42", claims["sub"])
	assert.Equal(t, "user@example.com", claims["email"])
}

// buildFakeJWT constructs a minimal JWT-like string (header.payload.signature)
// with a valid base64url-encoded payload from the given claims map.
func buildFakeJWT(t *testing.T, payload map[string]interface{}) string {
	t.Helper()

	payloadJSON, err := json.Marshal(payload)
	require.NoError(t, err)

	// Encode header and payload in base64url
	header := base64urlEncode([]byte(`{"alg":"RS256","typ":"JWT"}`))
	encodedPayload := base64urlEncode(payloadJSON)
	// Fake signature
	signature := base64urlEncode([]byte("fake-signature"))

	return header + "." + encodedPayload + "." + signature
}

// dbCreateSettings inserts AccountOIDCSettings into the test DB.
func dbCreateSettings(t *testing.T, svc *OIDCService, settings *model.AccountOIDCSettings) {
	t.Helper()
	err := svc.db.Create(settings).Error
	require.NoError(t, err)
}