package router

import (
	"net/http"
	"net/http/httptest"
	"regexp"
	"strings"
	"testing"
	"vctp/version"
)

var externalAssetRefPattern = regexp.MustCompile(`\b(?:src|href)=["']https?://`)

func TestHomePageUsesLocalVersionedAssets(t *testing.T) {
	orig := version.Value
	version.Value = "1.2.3"
	defer func() { version.Value = orig }()

	app := testRouter(t, testRouterSettings(t, false))
	req := httptest.NewRequest(http.MethodGet, "/", nil)
	rr := httptest.NewRecorder()
	app.ServeHTTP(rr, req)

	if rr.Code != http.StatusOK {
		t.Fatalf("expected status %d, got %d", http.StatusOK, rr.Code)
	}
	body := rr.Body.String()

	for _, want := range []string{
		`href="/favicon.ico?v=1.2.3"`,
		`href="/favicon-16x16.png?v=1.2.3"`,
		`href="/favicon-32x32.png?v=1.2.3"`,
		`src="/assets/js/htmx@v2.0.2.min.js"`,
		`src="/assets/js/web3-charts.js?v=1.2.3"`,
		`href="/assets/css/output@1.2.3.css"`,
		`href="/assets/css/web3.css?v=1.2.3"`,
	} {
		if !strings.Contains(body, want) {
			t.Fatalf("expected response body to contain %q", want)
		}
	}

	if externalAssetRefPattern.MatchString(body) {
		t.Fatalf("home page contains external asset URL: %s", body)
	}
}

func TestSwaggerUIUsesLocalAssetsOnly(t *testing.T) {
	app := testRouter(t, testRouterSettings(t, false))
	req := httptest.NewRequest(http.MethodGet, "/swagger/", nil)
	rr := httptest.NewRecorder()
	app.ServeHTTP(rr, req)

	if rr.Code != http.StatusOK {
		t.Fatalf("expected status %d, got %d", http.StatusOK, rr.Code)
	}
	body := rr.Body.String()

	for _, want := range []string{
		`href="./swagger-ui.css"`,
		`src="./swagger-ui-bundle.js"`,
		`src="./swagger-ui-standalone-preset.js"`,
		`src="./swagger-initializer.js"`,
	} {
		if !strings.Contains(body, want) {
			t.Fatalf("expected swagger index to contain %q", want)
		}
	}

	if externalAssetRefPattern.MatchString(body) {
		t.Fatalf("swagger index contains external asset URL: %s", body)
	}
}

func TestStaticResourcesAreCacheableInReleaseMode(t *testing.T) {
	orig := version.Value
	version.Value = "1.2.3"
	defer func() { version.Value = orig }()

	app := testRouter(t, testRouterSettings(t, false))

	tests := []struct {
		path             string
		wantCacheControl string
	}{
		{path: "/assets/css/web3.css?v=1.2.3", wantCacheControl: "public, max-age=31536000, immutable"},
		{path: "/assets/js/htmx@v2.0.2.min.js", wantCacheControl: "public, max-age=31536000, immutable"},
		{path: "/favicon.ico?v=1.2.3", wantCacheControl: "public, max-age=31536000, immutable"},
		{path: "/swagger/swagger-ui.css", wantCacheControl: "public, max-age=31536000"},
		{path: "/swagger.json", wantCacheControl: "public, max-age=31536000"},
	}

	for _, tc := range tests {
		t.Run(tc.path, func(t *testing.T) {
			req := httptest.NewRequest(http.MethodGet, tc.path, nil)
			rr := httptest.NewRecorder()
			app.ServeHTTP(rr, req)

			if rr.Code != http.StatusOK {
				t.Fatalf("expected status %d for %s, got %d", http.StatusOK, tc.path, rr.Code)
			}

			if got := rr.Header().Get("Cache-Control"); got != tc.wantCacheControl {
				t.Fatalf("unexpected Cache-Control for %s: got %q want %q", tc.path, got, tc.wantCacheControl)
			}
			if got := rr.Header().Get("Vary"); got != "Accept-Encoding" {
				t.Fatalf("unexpected Vary for %s: %q", tc.path, got)
			}
			if rr.Header().Get("Expires") == "" {
				t.Fatalf("expected Expires for %s", tc.path)
			}
		})
	}
}