package surf

import (
	"net/http"
	"net/http/httptest"
	"net/netip"
	"os"
	"path/filepath"
	"testing"
	"time"

	"git.golem15.com/golem15/summercms/modules/compass"
)

// Gap (b): MemoryStore's sweep goroutine (purge), not Attempt's lazy expiry.
// Construct with a short sweep and assert the internal map drops
// an expired entry without a later Attempt.

func TestMemoryStoreSweepRemovesExpiredEntry(t *testing.T) {
	s := NewMemoryStore(15 * time.Millisecond)
	t.Cleanup(func() { close(s.stop) })

	s.Attempt("k", 1, 25*time.Millisecond)
	s.mu.Lock()
	n := len(s.entries)
	s.mu.Unlock()
	if n != 1 {
		t.Fatalf("after Attempt, entries = %d", n)
	}

	deadline := time.Now().Add(200 * time.Millisecond)
	for time.Now().Before(deadline) {
		s.mu.Lock()
		n = len(s.entries)
		s.mu.Unlock()
		if n == 0 {
			return
		}
		time.Sleep(10 * time.Millisecond)
	}
	t.Fatalf("sweep did not drop expired entry, count=%d", n)
}

func TestMemoryStoreAttemptRetryAfterAndExpiry(t *testing.T) {
	s := NewMemoryStore(0)
	allowed, attempts, retryAfter := s.Attempt("k", 1, 20*time.Millisecond)
	if !allowed || attempts != 1 || retryAfter <= 0 {
		t.Fatalf("first attempt = allowed %v, attempts %d, retryAfter %s", allowed, attempts, retryAfter)
	}
	allowed, attempts, retryAfter = s.Attempt("k", 1, 20*time.Millisecond)
	if allowed || attempts != 1 || retryAfter <= 0 {
		t.Fatalf("denied attempt = allowed %v, attempts %d, retryAfter %s", allowed, attempts, retryAfter)
	}
	time.Sleep(30 * time.Millisecond)
	allowed, attempts, retryAfter = s.Attempt("k", 1, 20*time.Millisecond)
	if !allowed || attempts != 1 || retryAfter <= 0 {
		t.Fatalf("expired attempt = allowed %v, attempts %d, retryAfter %s", allowed, attempts, retryAfter)
	}
}

func TestTrustedProxiesParsesConfig(t *testing.T) {
	if TrustedProxies(nil) != nil {
		t.Fatal("nil cfg must return nil")
	}
	dir := t.TempDir()
	if err := os.WriteFile(filepath.Join(dir, "app.yaml"), []byte("name: t\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(dir, "http.yaml"), []byte("trusted_proxies:\n  - 10.0.0.0/8\n  - not-a-cidr\n  - 192.168.0.0/16\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	cfg, err := compass.Open(compass.Options{Dir: dir, Environ: []string{}})
	if err != nil {
		t.Fatal(err)
	}
	got := TrustedProxies(cfg)
	if len(got) != 2 || got[0].String() != "10.0.0.0/8" || got[1].String() != "192.168.0.0/16" {
		t.Fatalf("TrustedProxies = %v", got)
	}
}

func TestClientIPNilRequestAndEmptyXFF(t *testing.T) {
	if got := ClientIP(nil, nil); got != "" {
		t.Fatalf("nil request = %q", got)
	}
	trusted := []netip.Prefix{mustPrefix("10.0.0.0/8")}
	req := httptest.NewRequest(http.MethodGet, "/", nil)
	req.RemoteAddr = "10.0.0.1:443"
	if got := ClientIP(req, trusted); got != "10.0.0.1" {
		t.Fatalf("trusted RemoteAddr, empty XFF = %q", got)
	}
}