package main

import (
	"io/fs"
	"net/http"
	"net/http/httptest"
	"regexp"
	"testing"
)

// Every {{asset "…"}} in the templates must name an embedded file, or the page
// fails to render.
func TestTemplateAssetsExist(t *testing.T) {
	ref := regexp.MustCompile(`\{\{asset "([^"]+)"\}\}`)
	_ = fs.WalkDir(assets, "assets", func(p string, d fs.DirEntry, err error) error {
		if err != nil || d.IsDir() {
			return err
		}
		b, _ := assets.ReadFile(p)
		for _, m := range ref.FindAllSubmatch(b, -1) {
			if _, err := assetURL(string(m[1])); err != nil {
				t.Errorf("%s: %v", p, err)
			}
		}
		return nil
	})
}

func TestServeStaticCaching(t *testing.T) {
	h := serveStatic()
	get := func(url, ifNoneMatch string) *httptest.ResponseRecorder {
		r := httptest.NewRequest(http.MethodGet, url, nil)
		if ifNoneMatch != "" {
			r.Header.Set("If-None-Match", ifNoneMatch)
		}
		w := httptest.NewRecorder()
		h.ServeHTTP(w, r)
		return w
	}
	v := assetVersions["style.css"]

	versioned, _ := assetURL("style.css")
	if w := get(versioned, ""); w.Code != 200 || w.Header().Get("Cache-Control") != "public, max-age=31536000, immutable" {
		t.Errorf("versioned: %d %q", w.Code, w.Header().Get("Cache-Control"))
	}
	for _, u := range []string{"/_/style.css", "/_/style.css?v=stale"} {
		w := get(u, "")
		if w.Code != 200 || w.Header().Get("Cache-Control") != "no-cache" || w.Header().Get("ETag") != `"`+v+`"` {
			t.Errorf("%s: %d %q %q", u, w.Code, w.Header().Get("Cache-Control"), w.Header().Get("ETag"))
		}
	}
	if w := get("/_/style.css", `"`+v+`"`); w.Code != http.StatusNotModified {
		t.Errorf("revalidate: got %d, want 304", w.Code)
	}
	if w := get("/_/fonts/IosevkaSlab.woff2", ""); w.Header().Get("Cache-Control") != "public, max-age=31536000, immutable" {
		t.Errorf("font: %q", w.Header().Get("Cache-Control"))
	}
}