package server

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

func TestNewUIRendererLoadsEmbeddedAssets(t *testing.T) {
	renderer := newUIRenderer()

	if renderer == nil {
		t.Fatalf("expected ui renderer instance")
	}
	if renderer.fsys == nil {
		t.Fatalf("expected embedded UI filesystem to be available")
	}
}

func TestNewUIRendererFromFSHandlesMissingSubdirectory(t *testing.T) {
	renderer := newUIRendererFromFS(fstest.MapFS{}, "../ui-dist")
	if renderer == nil {
		t.Fatalf("expected renderer instance")
	}
	if renderer.fsys != nil {
		t.Fatalf("expected missing subdirectory to produce empty renderer, got %#v", renderer.fsys)
	}
}

func TestUIRendererServeIndexHandlesMissingAndEmbeddedAssets(t *testing.T) {
	t.Run("missing assets", func(t *testing.T) {
		renderer := &uiRenderer{}
		req := httptest.NewRequest(http.MethodGet, "/", nil)
		res := httptest.NewRecorder()

		err := renderer.ServeIndex(res, req)
		if err == nil || !strings.Contains(err.Error(), "not available") {
			t.Fatalf("expected missing UI asset error, got %v", err)
		}
	})

	t.Run("missing index file", func(t *testing.T) {
		renderer := &uiRenderer{fsys: fstest.MapFS{}}
		req := httptest.NewRequest(http.MethodGet, "/", nil)
		res := httptest.NewRecorder()

		err := renderer.ServeIndex(res, req)
		if err == nil || !strings.Contains(err.Error(), "read index") {
			t.Fatalf("expected index read error, got %v", err)
		}
	})

	t.Run("embedded index", func(t *testing.T) {
		renderer := newUIRenderer()
		req := httptest.NewRequest(http.MethodGet, "/", nil)
		res := httptest.NewRecorder()

		if err := renderer.ServeIndex(res, req); err != nil {
			t.Fatalf("expected embedded index to render, got %v", err)
		}
		if got := res.Header().Get("Content-Type"); got != "text/html; charset=utf-8" {
			t.Fatalf("expected html content type, got %q", got)
		}
		if got := res.Header().Get("Cache-Control"); got != "no-store" {
			t.Fatalf("expected no-store cache control, got %q", got)
		}
		if !strings.Contains(res.Body.String(), "Soteria Backup Console") {
			t.Fatalf("expected rendered index HTML, got %q", res.Body.String())
		}
	})
}

func TestUIRendererServeAssetRejectsInvalidPathsAndServesRealAssets(t *testing.T) {
	renderer := newUIRenderer()
	trailingSlashRenderer := &uiRenderer{fsys: fstest.MapFS{
		"assets/index.js": &fstest.MapFile{Data: []byte("console.log('ok')")},
	}}
	missingPathRenderer := &uiRenderer{fsys: fstest.MapFS{}}

	testCases := []struct {
		name   string
		method string
		path   string
		ok     bool
		use    *uiRenderer
	}{
		{name: "missing filesystem", method: http.MethodGet, path: "/assets/index-C8vHBL9g.js", ok: false, use: &uiRenderer{}},
		{name: "invalid method", method: http.MethodPost, path: "/assets/index-C8vHBL9g.js", ok: false},
		{name: "empty path", method: http.MethodGet, path: "/", ok: false},
		{name: "dot path", method: http.MethodGet, path: "/.", ok: false},
		{name: "api path", method: http.MethodGet, path: "/v1/backup", ok: false},
		{name: "parent traversal", method: http.MethodGet, path: "/../secret.txt", ok: false},
		{name: "trailing slash", method: http.MethodGet, path: "/assets/", ok: false, use: trailingSlashRenderer},
		{name: "missing file", method: http.MethodGet, path: "/assets/does-not-exist.js", ok: false, use: missingPathRenderer},
		{name: "real asset", method: http.MethodGet, path: "/assets/index-C8vHBL9g.js", ok: true},
		{name: "head asset", method: http.MethodHead, path: "/assets/index-B24a4-XK.css", ok: true},
	}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			activeRenderer := renderer
			if tc.use != nil {
				activeRenderer = tc.use
			}

			req := httptest.NewRequest(tc.method, tc.path, nil)
			res := httptest.NewRecorder()

			if got := activeRenderer.ServeAsset(res, req); got != tc.ok {
				t.Fatalf("expected ServeAsset=%v, got %v", tc.ok, got)
			}
			if tc.ok && res.Code != http.StatusOK {
				t.Fatalf("expected successful asset response, got %d", res.Code)
			}
		})
	}
}