package test

import (
	"RenewCMS/api/handlers/auth"
	"RenewCMS/api/middleware"
	"RenewCMS/api/pkg/apperr"
	"RenewCMS/api/pkg/publicuser"
	validator "RenewCMS/api/pkg/validator"
	"RenewCMS/internal/domain/user"
	"RenewCMS/internal/infrastructure/useCases"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/go-chi/chi/v5"
	"github.com/go-chi/jwtauth/v5"
)

func newGetCurrentUserRouter(userRepo *mockUserRepo, hasher *stubHasher, token *jwtauth.JWTAuth) *chi.Mux {
	getUserUseCase := useCases.NewGetUserUseCase(userRepo)
	meHandler := auth.NewMeHandler(getUserUseCase, useCases.NewGetMyAuthorUseCase(plainAuthors()))
	verificationHandler := auth.NewVerificationHandler(
		useCases.NewVerifyUserUseCase(userRepo, hasher, discardRecorder),
		useCases.NewCancelRegistrationUseCase(userRepo),
		true,
	)

	r := chi.NewRouter()
	r.Route("/v1/auth", func(r chi.Router) {
		r.Group(func(r chi.Router) {
			r.Use(jwtauth.Verifier(token))
			r.Use(jwtauth.Authenticator(token))
			r.Use(middleware.RequireCurrentToken(getUserUseCase))
			r.Get("/me", meHandler.Me)
			r.Delete("/register", verificationHandler.CancelRegistration)
		})
	})
	return r
}

func mintGetCurrentUserCookie(t *testing.T, token *jwtauth.JWTAuth, userId uint32, tokenVersion uint32) *http.Cookie {
	t.Helper()
	_, tokenString, err := token.Encode(map[string]any{"user_id": userId, "token_version": tokenVersion})
	if err != nil {
		t.Fatalf("failed to encode jwt: %v", err)
	}
	return &http.Cookie{Name: "jwt", Value: tokenString}
}

func sendGetCurrentUserRequest(router *chi.Mux, method, target string, cookie *http.Cookie) *httptest.ResponseRecorder {
	req := httptest.NewRequest(method, target, nil)
	if cookie != nil {
		req.AddCookie(cookie)
	}
	rec := httptest.NewRecorder()
	router.ServeHTTP(rec, req)
	return rec
}

func TestGetCurrentUserHttp(t *testing.T) {
	validator.InitValidator()

	t.Run("A verified user fetches their own profile", func(t *testing.T) {
		token := jwtauth.New("HS256", []byte("test-secret"), nil)
		userRepo := newMockUserRepo()
		userRepo.users[7] = user.User{
			ID:           7,
			Username:     "alice",
			Email:        "alice@example.com",
			IsVerified:   true,
			TokenVersion: 0,
		}
		router := newGetCurrentUserRouter(userRepo, &stubHasher{}, token)
		cookie := mintGetCurrentUserCookie(t, token, 7, 0)

		rec := sendGetCurrentUserRequest(router, http.MethodGet, "/v1/auth/me", cookie)

		if rec.Code != http.StatusOK {
			t.Fatalf("expected status 200, got %d: %s", rec.Code, rec.Body.String())
		}
		if got := rec.Header().Get("Cache-Control"); got != "no-store" {
			t.Errorf("expected Cache-Control no-store, got %q", got)
		}
		var body publicuser.PublicUser
		if err := json.Unmarshal(rec.Body.Bytes(), &body); err != nil {
			t.Fatalf("failed to unmarshal body: %v", err)
		}
		if body.ID != 7 || body.Username != "alice" || body.Email != "alice@example.com" || !body.IsVerified {
			t.Errorf("unexpected body: %+v", body)
		}
	})

	t.Run("An unverified user still fetches their own profile, with is_verified false, not a 403", func(t *testing.T) {
		token := jwtauth.New("HS256", []byte("test-secret"), nil)
		userRepo := newMockUserRepo()
		userRepo.users[8] = user.User{
			ID:           8,
			Username:     "bob",
			Email:        "bob@example.com",
			IsVerified:   false,
			TokenVersion: 0,
		}
		router := newGetCurrentUserRouter(userRepo, &stubHasher{}, token)
		cookie := mintGetCurrentUserCookie(t, token, 8, 0)

		rec := sendGetCurrentUserRequest(router, http.MethodGet, "/v1/auth/me", cookie)

		if rec.Code != http.StatusOK {
			t.Fatalf("expected status 200, got %d: %s", rec.Code, rec.Body.String())
		}
		if got := rec.Header().Get("Cache-Control"); got != "no-store" {
			t.Errorf("expected Cache-Control no-store, got %q", got)
		}
		var body publicuser.PublicUser
		if err := json.Unmarshal(rec.Body.Bytes(), &body); err != nil {
			t.Fatalf("failed to unmarshal body: %v", err)
		}
		if body.IsVerified {
			t.Errorf("expected is_verified false, got true")
		}
	})

	t.Run("No jwt cookie at all is refused", func(t *testing.T) {
		token := jwtauth.New("HS256", []byte("test-secret"), nil)
		userRepo := newMockUserRepo()
		userRepo.users[7] = user.User{ID: 7, Username: "alice", IsVerified: true, TokenVersion: 0}
		router := newGetCurrentUserRouter(userRepo, &stubHasher{}, token)

		rec := sendGetCurrentUserRequest(router, http.MethodGet, "/v1/auth/me", nil)

		if rec.Code != http.StatusUnauthorized {
			t.Fatalf("expected status 401, got %d: %s", rec.Code, rec.Body.String())
		}
	})

	t.Run("A jwt whose token_version no longer matches the stored user is refused", func(t *testing.T) {
		token := jwtauth.New("HS256", []byte("test-secret"), nil)
		userRepo := newMockUserRepo()
		userRepo.users[7] = user.User{ID: 7, Username: "alice", IsVerified: true, TokenVersion: 1}
		router := newGetCurrentUserRouter(userRepo, &stubHasher{}, token)
		cookie := mintGetCurrentUserCookie(t, token, 7, 0)

		rec := sendGetCurrentUserRequest(router, http.MethodGet, "/v1/auth/me", cookie)

		if rec.Code != http.StatusUnauthorized {
			t.Fatalf("expected status 401, got %d: %s", rec.Code, rec.Body.String())
		}
		if rec.Body.String() != apperr.UnauthorizedErrorMessage+"\n" {
			t.Errorf("unexpected body: %q", rec.Body.String())
		}
	})

	t.Run("A jwt minted for a since-deleted account is refused", func(t *testing.T) {
		token := jwtauth.New("HS256", []byte("test-secret"), nil)
		userRepo := newMockUserRepo()
		userRepo.users[7] = user.User{ID: 7, Username: "alice", IsVerified: false, TokenVersion: 0}
		router := newGetCurrentUserRouter(userRepo, &stubHasher{}, token)
		cookie := mintGetCurrentUserCookie(t, token, 7, 0)

		cancelRec := sendGetCurrentUserRequest(router, http.MethodDelete, "/v1/auth/register", cookie)
		if cancelRec.Code != http.StatusOK {
			t.Fatalf("expected status 200, got %d: %s", cancelRec.Code, cancelRec.Body.String())
		}

		rec := sendGetCurrentUserRequest(router, http.MethodGet, "/v1/auth/me", cookie)
		if rec.Code != http.StatusUnauthorized {
			t.Fatalf("expected status 401, got %d: %s", rec.Code, rec.Body.String())
		}
		if rec.Body.String() != apperr.UnauthorizedErrorMessage+"\n" {
			t.Errorf("unexpected body: %q", rec.Body.String())
		}
	})

	t.Run("The route is never rate-limited, unlike login and password reset", func(t *testing.T) {
		token := jwtauth.New("HS256", []byte("test-secret"), nil)
		userRepo := newMockUserRepo()
		userRepo.users[7] = user.User{ID: 7, Username: "alice", IsVerified: true, TokenVersion: 0}
		router := newGetCurrentUserRouter(userRepo, &stubHasher{}, token)
		cookie := mintGetCurrentUserCookie(t, token, 7, 0)

		for i := 0; i < 5; i++ {
			rec := sendGetCurrentUserRequest(router, http.MethodGet, "/v1/auth/me", cookie)
			if rec.Code != http.StatusOK {
				t.Fatalf("request %d: expected status 200, got %d: %s", i, rec.Code, rec.Body.String())
			}
			if rec.Code == http.StatusTooManyRequests {
				t.Fatalf("request %d: got 429", i)
			}
		}
	})
}