package engineeringdashboard

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

func TestServer_RejectsNonGETAndBadHost(t *testing.T) {
	c := NewCollector(t.TempDir(), &FakeRunner{Map: map[string]FakeResult{}})
	c.mu.Lock()
	c.current = &Snapshot{
		SchemaVersion: SchemaVersion, GenerationID: "gen_1", RevisionID: "rev_1",
		GeneratedAt: time.Now().UTC(), Repository: RepositoryIdentity{Root: "/r"},
	}
	c.mu.Unlock()
	srv, err := NewServer(c)
	if err != nil {
		t.Fatal(err)
	}
	h := srv.Handler()

	req := httptest.NewRequest(http.MethodPost, "/api/v1/snapshot", nil)
	req.Host = "127.0.0.1:8787"
	rr := httptest.NewRecorder()
	h.ServeHTTP(rr, req)
	if rr.Code != http.StatusMethodNotAllowed {
		t.Fatalf("POST: %d", rr.Code)
	}

	req = httptest.NewRequest(http.MethodGet, "/api/v1/snapshot", nil)
	req.Host = "evil.example"
	rr = httptest.NewRecorder()
	h.ServeHTTP(rr, req)
	if rr.Code != http.StatusForbidden {
		t.Fatalf("bad host: %d", rr.Code)
	}
}

func TestServer_SnapshotWithoutToken(t *testing.T) {
	c := NewCollector(t.TempDir(), &FakeRunner{Map: map[string]FakeResult{}})
	snap := Snapshot{
		SchemaVersion: SchemaVersion, GenerationID: "gen_9", RevisionID: "rev_abc",
		GeneratedAt: time.Now().UTC(), Repository: RepositoryIdentity{Root: "/repo", Branch: "dev", Head: "h"},
		Tasks: []TaskState{SampleRDevTaskFixture()},
	}
	c.mu.Lock()
	c.current = &snap
	c.mu.Unlock()
	srv, err := NewServer(c)
	if err != nil {
		t.Fatal(err)
	}
	h := srv.Handler()

	req := httptest.NewRequest(http.MethodGet, "/api/v1/snapshot", nil)
	req.Host = "127.0.0.1:8787"
	rr := httptest.NewRecorder()
	h.ServeHTTP(rr, req)
	if rr.Code != 200 {
		t.Fatalf("snapshot without token: %d %s", rr.Code, rr.Body.String())
	}
	body := rr.Body.String()
	if !strings.Contains(body, `"generation_id": "gen_9"`) || !strings.Contains(body, `"revision_id": "rev_abc"`) {
		t.Fatalf("identity missing: %s", body)
	}
	if rr.Header().Get("ETag") != `"rev_abc"` {
		t.Fatalf("etag %q", rr.Header().Get("ETag"))
	}

	req = httptest.NewRequest(http.MethodGet, "/api/v1/snapshot", nil)
	req.Host = "127.0.0.1:8787"
	req.Header.Set("If-None-Match", `"rev_abc"`)
	rr = httptest.NewRecorder()
	h.ServeHTTP(rr, req)
	if rr.Code != http.StatusNotModified {
		t.Fatalf("etag: %d", rr.Code)
	}
}

func TestServer_DocPathTraversalDenied(t *testing.T) {
	root := t.TempDir()
	writeDoc(t, root, ".doc/ops/ok.md", "# ok\n")
	c := NewCollector(root, &FakeRunner{Map: map[string]FakeResult{}})
	srv, err := NewServer(c)
	if err != nil {
		t.Fatal(err)
	}
	req := httptest.NewRequest(http.MethodGet, "/api/v1/doc/not-a-real.md", nil)
	req.Host = "127.0.0.1:8787"
	req.URL.Path = "/api/v1/doc/../../.env"
	rr := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rr, req)
	if rr.Code != http.StatusForbidden {
		t.Fatalf("got %d body=%s", rr.Code, rr.Body.String())
	}
}

func TestListenAndServe_RejectsNonLoopback(t *testing.T) {
	err := ListenAndServe("0.0.0.0:8787", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
	if err == nil || !strings.Contains(err.Error(), "loopback") {
		t.Fatalf("expected loopback reject, got %v", err)
	}
}

func TestServer_CrossOriginDenied(t *testing.T) {
	c := NewCollector(t.TempDir(), &FakeRunner{})
	c.mu.Lock()
	c.current = &Snapshot{RevisionID: "r", GenerationID: "g", GeneratedAt: time.Now().UTC()}
	c.mu.Unlock()
	srv, _ := NewServer(c)
	req := httptest.NewRequest(http.MethodGet, "/api/v1/snapshot", nil)
	req.Host = "127.0.0.1:8787"
	req.Header.Set("Origin", "https://evil.example")
	rr := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rr, req)
	if rr.Code != http.StatusForbidden {
		t.Fatalf("got %d", rr.Code)
	}
}

func TestServer_IndexHasNoTokenMachinery(t *testing.T) {
	c := NewCollector(t.TempDir(), &FakeRunner{})
	c.mu.Lock()
	c.current = &Snapshot{RevisionID: "r", GenerationID: "g", GeneratedAt: time.Now().UTC()}
	c.mu.Unlock()
	srv, err := NewServer(c)
	if err != nil {
		t.Fatal(err)
	}
	req := httptest.NewRequest(http.MethodGet, "/", nil)
	req.Host = "127.0.0.1:8787"
	rr := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rr, req)
	if rr.Code != http.StatusOK {
		t.Fatalf("index: %d %s", rr.Code, rr.Body.String())
	}
	body := rr.Body.String()
	for _, banned := range []string{"__DASHBOARD_TOKEN__", "engineering-dashboard-token", "?token="} {
		if strings.Contains(body, banned) {
			t.Fatalf("index still contains %q", banned)
		}
	}
	js, err := readAsset("assets/app.js")
	if err != nil {
		t.Fatal(err)
	}
	jsBody := string(js)
	if strings.Contains(jsBody, "token=") || strings.Contains(jsBody, "__DASHBOARD_TOKEN__") {
		t.Fatal("app.js still references token auth")
	}
	if !strings.Contains(rr.Header().Get("Content-Security-Policy"), "script-src 'self'") {
		t.Fatalf("unexpected CSP: %s", rr.Header().Get("Content-Security-Policy"))
	}
}