package web

import (
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"maisym.com/hsa/internal/auth"
	"maisym.com/hsa/internal/config"
)

func testServer() *Server {
	var key [32]byte
	copy(key[:], "web-test-key-32-bytes-padded!!!!")
	return &Server{cfg: config.Config{
		SessionKey:    key,
		RequiredGroup: "hsa-users",
		SecureCookies: false,
	}}
}

func TestStaticCSS(t *testing.T) {
	s := testServer()
	req := httptest.NewRequest(http.MethodGet, "/static/style.css", nil)
	rec := httptest.NewRecorder()
	s.Routes().ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200", rec.Code)
	}
	if !strings.Contains(rec.Body.String(), "font-family") {
		t.Errorf("CSS not served: %q", rec.Body.String())
	}
}

func TestHealthz(t *testing.T) {
	s := testServer()
	req := httptest.NewRequest(http.MethodGet, "/healthz", nil)
	rec := httptest.NewRecorder()
	s.Routes().ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200", rec.Code)
	}
	if !strings.Contains(rec.Body.String(), "ok") {
		t.Errorf("body = %q, want to contain ok", rec.Body.String())
	}
}

func TestHome_NoSession_RedirectsToLogin(t *testing.T) {
	s := testServer()
	req := httptest.NewRequest(http.MethodGet, "/", nil)
	rec := httptest.NewRecorder()
	s.Routes().ServeHTTP(rec, req)

	if rec.Code != http.StatusFound {
		t.Fatalf("status = %d, want 302", rec.Code)
	}
	if loc := rec.Header().Get("Location"); loc != "/login" {
		t.Errorf("Location = %q, want /login", loc)
	}
}

func TestHome_ValidSession_ShowsUploadForm(t *testing.T) {
	s := testServerWithStore(t)
	sess := auth.Session{Subject: "jm@example.com", Groups: []string{"hsa-users"}}
	cookie, err := auth.EncodeSession(sess, s.cfg.SessionKey)
	if err != nil {
		t.Fatal(err)
	}

	req := httptest.NewRequest(http.MethodGet, "/", nil)
	req.AddCookie(&http.Cookie{Name: sessionCookie, Value: cookie})
	rec := httptest.NewRecorder()
	s.Routes().ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200", rec.Code)
	}
	body := rec.Body.String()
	if !strings.Contains(body, "jm@example.com") {
		t.Errorf("body missing subject: %q", body)
	}
	if !strings.Contains(body, "Add receipt") {
		t.Errorf("body missing upload form: %q", body)
	}
}

func TestHome_TamperedSession_RedirectsToLogin(t *testing.T) {
	s := testServer()
	sess := auth.Session{Subject: "jm@example.com", Groups: []string{"hsa-users"}}
	cookie, _ := auth.EncodeSession(sess, s.cfg.SessionKey)
	tampered := cookie[:len(cookie)-3] + "AAA"

	req := httptest.NewRequest(http.MethodGet, "/", nil)
	req.AddCookie(&http.Cookie{Name: sessionCookie, Value: tampered})
	rec := httptest.NewRecorder()
	s.Routes().ServeHTTP(rec, req)

	if rec.Code != http.StatusFound {
		t.Fatalf("status = %d, want 302", rec.Code)
	}
	if loc := rec.Header().Get("Location"); loc != "/login" {
		t.Errorf("Location = %q, want /login", loc)
	}
}

func TestLogout_ClearsCookieAndRedirects(t *testing.T) {
	s := testServer()
	req := httptest.NewRequest(http.MethodGet, "/logout", nil)
	rec := httptest.NewRecorder()
	s.Routes().ServeHTTP(rec, req)

	if rec.Code != http.StatusFound {
		t.Fatalf("status = %d, want 302", rec.Code)
	}
	// The session cookie should be expired (MaxAge < 0).
	var cleared bool
	for _, c := range rec.Result().Cookies() {
		if c.Name == sessionCookie && c.MaxAge < 0 {
			cleared = true
		}
	}
	if !cleared {
		t.Error("logout did not clear the session cookie")
	}
}