/*
이 테스트 파일은 AuthHandler의 PasswordLogin 메서드 내 OIDC/Hydra 관련 로직을 검증합니다.
특히 Hydra Login Request 조회, 검증(Inactive 체크), 승인(Accept) 흐름을 중점적으로 테스트합니다.
*/

package handler

import (
	"baron-sso-backend/internal/domain"
	"baron-sso-backend/internal/service"
	"bytes"
	"context"
	"encoding/json"
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/gofiber/fiber/v2"
	"github.com/stretchr/testify/mock"
)

// --- Mocks ---

type MockIdentityProvider struct {
	mock.Mock
}

func (m *MockIdentityProvider) Name() string {
	return "mock-idp"
}

func (m *MockIdentityProvider) GetMetadata() (*domain.IDPMetadata, error) {
	return nil, nil
}

func (m *MockIdentityProvider) CreateUser(user *domain.BrokerUser, password string) (string, error) {
	return "", nil
}

func (m *MockIdentityProvider) SignIn(loginID, password string) (*domain.AuthInfo, error) {
	args := m.Called(loginID, password)
	if args.Get(0) == nil {
		return nil, args.Error(1)
	}
	return args.Get(0).(*domain.AuthInfo), args.Error(1)
}

func (m *MockIdentityProvider) UserExists(loginID string) (bool, error) {
	return true, nil
}

func (m *MockIdentityProvider) IssueSession(loginID string) (*domain.AuthInfo, error) {
	return nil, nil
}

func (m *MockIdentityProvider) InitiateLinkLogin(loginID, returnTo string) (*domain.LinkLoginInit, error) {
	return nil, nil
}

func (m *MockIdentityProvider) VerifyLoginCode(loginID, flowID, code string) (*domain.AuthInfo, error) {
	return nil, nil
}

func (m *MockIdentityProvider) GetPasswordPolicy() (*domain.PasswordPolicy, error) {
	return nil, nil
}

func (m *MockIdentityProvider) InitiatePasswordReset(loginID, redirectUrl string) error {
	return nil
}

func (m *MockIdentityProvider) VerifyPasswordResetToken(token string) (*domain.AuthInfo, error) {
	return nil, nil
}

func (m *MockIdentityProvider) UpdateUserPassword(loginID, newPassword string, r *http.Request) error {
	return nil
}

type MockKratosAdminService struct {
	mock.Mock
}

func (m *MockKratosAdminService) FindIdentityIDByIdentifier(ctx context.Context, identifier string) (string, error) {
	args := m.Called(ctx, identifier)
	return args.String(0), args.Error(1)
}

func (m *MockKratosAdminService) GetIdentity(ctx context.Context, id string) (*service.KratosIdentity, error) {
	args := m.Called(ctx, id)
	if args.Get(0) == nil {
		return nil, args.Error(1)
	}
	return args.Get(0).(*service.KratosIdentity), args.Error(1)
}

func (m *MockKratosAdminService) ListIdentities(ctx context.Context) ([]service.KratosIdentity, error) {
	return nil, nil
}

func (m *MockKratosAdminService) UpdateIdentity(ctx context.Context, identityID string, traits map[string]interface{}, state string) (*service.KratosIdentity, error) {
	return nil, nil
}

func (m *MockKratosAdminService) UpdateIdentityPassword(ctx context.Context, identityID, newPassword string) error {
	return nil
}

func (m *MockKratosAdminService) DeleteIdentity(ctx context.Context, identityID string) error {
	return nil
}

// --- Helper ---

func newAuthLoginTestApp(h *AuthHandler) *fiber.App {
	app := fiber.New()
	app.Post("/api/v1/auth/login", h.PasswordLogin)
	return app
}

// mockHydraTransport simulates Hydra API responses
func mockHydraTransport(handler http.Handler) http.RoundTripper {
	return roundTripFunc(func(req *http.Request) (*http.Response, error) {
		w := httptest.NewRecorder()
		handler.ServeHTTP(w, req)
		return w.Result(), nil
	})
}

// --- Tests ---

func TestPasswordLogin_OIDC_Success(t *testing.T) {
	mockIdp := new(MockIdentityProvider)

	// Mock IDP SignIn Success
	mockIdp.On("SignIn", "user@example.com", "password").Return(&domain.AuthInfo{
		SessionToken: &domain.Token{JWT: "valid-jwt"},
		Subject:      "kratos-identity-id",
	}, nil)

	// Mock Hydra Responses
	hydraHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch {
		case strings.Contains(r.URL.Path, "/oauth2/auth/requests/login") && r.Method == http.MethodGet:
			// GetLoginRequest
			challenge := r.URL.Query().Get("login_challenge")
			if challenge != "challenge-123" {
				http.Error(w, "invalid challenge", http.StatusBadRequest)
				return
			}
			json.NewEncoder(w).Encode(domain.HydraLoginRequest{
				Challenge: challenge,
				Client:    domain.HydraClient{ClientID: "client-1", Metadata: map[string]interface{}{"status": "active"}},
			})
		case strings.Contains(r.URL.Path, "/oauth2/auth/requests/login/accept") && r.Method == http.MethodPut:
			// AcceptLoginRequest
			json.NewEncoder(w).Encode(map[string]string{"redirect_to": "http://rp/cb"})
		default:
			http.NotFound(w, r)
		}
	})

	mockKratos := new(MockKratosAdminService)
	mockKratos.On("FindIdentityIDByIdentifier", mock.Anything, "user@example.com").Return("kratos-identity-id", nil)

	h := &AuthHandler{
		IdpProvider: mockIdp,
		KratosAdmin: mockKratos,
		Hydra: &service.HydraAdminService{
			AdminURL:   "http://hydra.test",
			HTTPClient: &http.Client{Transport: mockHydraTransport(hydraHandler)},
		},
	}

	app := newAuthLoginTestApp(h)

	body, _ := json.Marshal(map[string]string{
		"loginId":         "user@example.com",
		"password":        "password",
		"login_challenge": "challenge-123",
	})
	req := httptest.NewRequest(http.MethodPost, "/api/v1/auth/login", bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/json")

	resp, err := app.Test(req)
	if err != nil {
		t.Fatalf("request failed: %v", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		bodyBytes, _ := io.ReadAll(resp.Body)
		t.Fatalf("expected 200, got %d, body: %s", resp.StatusCode, string(bodyBytes))
	}

	var got map[string]interface{}
	json.NewDecoder(resp.Body).Decode(&got)
	if got["redirectTo"] != "http://rp/cb" {
		t.Errorf("expected redirectTo http://rp/cb, got %v", got["redirectTo"])
	}
	if _, ok := got["sessionJwt"]; ok {
		t.Errorf("expected OIDC response to omit sessionJwt, got %v", got["sessionJwt"])
	}
}

func TestPasswordLogin_OIDC_InactiveClient(t *testing.T) {
	mockIdp := new(MockIdentityProvider)
	mockIdp.On("SignIn", "user@example.com", "password").Return(&domain.AuthInfo{
		SessionToken: &domain.Token{JWT: "valid-jwt"},
		Subject:      "kratos-identity-id",
	}, nil)

	hydraHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if strings.Contains(r.URL.Path, "/oauth2/auth/requests/login") && r.Method == http.MethodGet {
			json.NewEncoder(w).Encode(domain.HydraLoginRequest{
				Client: domain.HydraClient{ClientID: "client-inactive", Metadata: map[string]interface{}{"status": "inactive"}},
			})
			return
		}
		http.NotFound(w, r)
	})

	mockKratos := new(MockKratosAdminService)
	mockKratos.On("FindIdentityIDByIdentifier", mock.Anything, "user@example.com").Return("kratos-identity-id", nil)

	h := &AuthHandler{
		IdpProvider: mockIdp,
		KratosAdmin: mockKratos,
		Hydra: &service.HydraAdminService{
			AdminURL:   "http://hydra.test",
			HTTPClient: &http.Client{Transport: mockHydraTransport(hydraHandler)},
		},
	}

	app := newAuthLoginTestApp(h)

	body, _ := json.Marshal(map[string]string{
		"loginId":         "user@example.com",
		"password":        "password",
		"login_challenge": "challenge-inactive",
	})
	req := httptest.NewRequest(http.MethodPost, "/api/v1/auth/login", bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/json")

	resp, err := app.Test(req)
	if err != nil {
		t.Fatalf("request failed: %v", err)
	}
	defer resp.Body.Close()

	// Should be Forbidden (403)
	if resp.StatusCode != http.StatusForbidden {
		t.Errorf("expected 403 Forbidden, got %d", resp.StatusCode)
	}
}

func TestPasswordLogin_NoOIDC_Success(t *testing.T) {
	mockIdp := new(MockIdentityProvider)
	mockIdp.On("SignIn", "user@example.com", "password").Return(&domain.AuthInfo{
		SessionToken: &domain.Token{JWT: "valid-jwt"},
		Subject:      "kratos-identity-id",
	}, nil)

	mockKratos := new(MockKratosAdminService)
	mockKratos.On("FindIdentityIDByIdentifier", mock.Anything, "user@example.com").Return("kratos-identity-id", nil)

	h := &AuthHandler{
		IdpProvider: mockIdp,
		KratosAdmin: mockKratos,
		Hydra:       service.NewHydraAdminService(),
	}

	app := newAuthLoginTestApp(h)

	body, _ := json.Marshal(map[string]string{
		"loginId":  "user@example.com",
		"password": "password",
	})
	req := httptest.NewRequest(http.MethodPost, "/api/v1/auth/login", bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/json")

	resp, err := app.Test(req)
	if err != nil {
		t.Fatalf("request failed: %v", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		t.Errorf("expected 200, got %d", resp.StatusCode)
	}
	var got map[string]string
	json.NewDecoder(resp.Body).Decode(&got)
	if got["sessionJwt"] != "valid-jwt" {
		t.Errorf("expected jwt valid-jwt, got %s", got["sessionJwt"])
	}
	// No redirectTo
	if _, ok := got["redirectTo"]; ok {
		t.Errorf("expected no redirectTo, got %s", got["redirectTo"])
	}
}

func TestPasswordLogin_InvalidCredentials_ReturnsCode(t *testing.T) {
	mockIdp := new(MockIdentityProvider)
	mockIdp.On("SignIn", "user@example.com", "wrong-password").Return(nil, errors.New("비밀번호가 일치하지 않습니다"))

	h := &AuthHandler{
		IdpProvider: mockIdp,
		KratosAdmin: service.NewKratosAdminService(),
		Hydra:       service.NewHydraAdminService(),
	}

	app := newAuthLoginTestApp(h)

	body, _ := json.Marshal(map[string]string{
		"loginId":  "user@example.com",
		"password": "wrong-password",
	})
	req := httptest.NewRequest(http.MethodPost, "/api/v1/auth/login", bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/json")

	resp, err := app.Test(req)
	if err != nil {
		t.Fatalf("request failed: %v", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusUnauthorized {
		t.Fatalf("expected 401, got %d", resp.StatusCode)
	}

	var got map[string]any
	if err := json.NewDecoder(resp.Body).Decode(&got); err != nil {
		t.Fatalf("failed to decode response: %v", err)
	}
	if got["code"] != "password_or_email_mismatch" {
		t.Fatalf("expected code=password_or_email_mismatch, got=%v", got["code"])
	}
	if got["error"] != "Invalid credentials" {
		t.Fatalf("expected error=Invalid credentials, got=%v", got["error"])
	}
}