package brand

import (
	"bytes"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"os"
	"testing"

	"amadan.net/oficina/estilo.git/theme"
)

// The icons' colours and the apps' accents are one ring: icons.json must
// carry exactly the hues theme/apps.go does, app for app.
func TestIconHuesAreTheThemeRing(t *testing.T) {
	raw, err := os.ReadFile("icons.json")
	if err != nil {
		t.Fatal(err)
	}
	var icons []struct {
		ID  string   `json:"id"`
		Hue *float64 `json:"hue"`
	}
	if err := json.Unmarshal(raw, &icons); err != nil {
		t.Fatal(err)
	}
	seen := map[string]bool{}
	for _, icon := range icons {
		seen[icon.ID] = true
		app, ok := theme.Lookup(icon.ID)
		switch {
		case !ok:
			t.Errorf("icons.json has %q, which is not on the theme ring", icon.ID)
		case icon.ID == "oficina":
			if icon.Hue != nil {
				t.Error("Oficina's mark is every hue, not one; its icons.json hue must be null")
			}
		case icon.Hue == nil || *icon.Hue != app.Hue:
			t.Errorf("%s: icons.json hue %v, theme ring %v", icon.ID, icon.Hue, app.Hue)
		}
		if SVG(icon.ID) == nil {
			t.Errorf("%s has no generated svg/", icon.ID)
		}
	}
	for _, app := range theme.Apps() {
		if !seen[app.Slug] {
			t.Errorf("%s is on the theme ring but has no icon", app.Slug)
		}
	}
}

func TestEveryAppHasAnIcon(t *testing.T) {
	for _, slug := range []string{"oficina", "docs", "sheets", "slides", "calendar", "calls", "memoria", "fichas", "mail", "files"} {
		body := SVG(slug)
		if !bytes.HasPrefix(bytes.TrimSpace(body), []byte("<svg")) {
			t.Errorf("%s: not an svg", slug)
		}
	}
	if !bytes.Equal(SVG("meet"), SVG("calls")) {
		t.Error("meet, Calls' old name, does not give Calls' icon")
	}
	if SVG("../go.mod") != nil || SVG("") != nil || SVG("home") != nil {
		t.Error("an unknown slug returned artwork")
	}
}

func TestHandler(t *testing.T) {
	h := Handler()
	get := func(method, path string) *httptest.ResponseRecorder {
		w := httptest.NewRecorder()
		h.ServeHTTP(w, httptest.NewRequest(method, path, nil))
		return w
	}
	w := get("GET", Path("docs"))
	docs, _ := os.ReadFile("svg/docs.svg")
	if w.Code != 200 || w.Header().Get("Content-Type") != "image/svg+xml" || w.Header().Get("X-Content-Type-Options") != "nosniff" || !bytes.Equal(w.Body.Bytes(), docs) {
		t.Fatalf("GET docs: %d %q", w.Code, w.Header())
	}
	if w := get("HEAD", Path("sheets")); w.Code != 200 || w.Body.Len() != 0 {
		t.Fatalf("HEAD: %d %d", w.Code, w.Body.Len())
	}
	for _, p := range []string{Prefix + "docs", Prefix + "nope.svg", Prefix + "../brand.css", "/elsewhere/docs.svg", Prefix} {
		if w := get("GET", p); w.Code != http.StatusNotFound {
			t.Errorf("%s: %d", p, w.Code)
		}
	}
	if w := get("POST", Path("docs")); w.Code != http.StatusMethodNotAllowed {
		t.Errorf("POST: %d", w.Code)
	}
}