/*************************************************************************/
/*  export.cpp                                                           */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/

#include "core/io/image_loader.h"
#include "core/io/stream_peer_ssl.h"
#include "core/io/tcp_server.h"
#include "core/io/zip_io.h"
#include "editor/editor_export.h"
#include "editor/editor_node.h"
#include "main/splash.gen.h"
#include "platform/javascript/logo.gen.h"
#include "platform/javascript/run_icon.gen.h"

class EditorHTTPServer : public RefCounted {
private:
	Ref<TCPServer> server;
	Map<String, String> mimes;
	Ref<StreamPeerTCP> tcp;
	Ref<StreamPeerSSL> ssl;
	Ref<StreamPeer> peer;
	Ref<CryptoKey> key;
	Ref<X509Certificate> cert;
	bool use_ssl = false;
	uint64_t time = 0;
	uint8_t req_buf[4096];
	int req_pos = 0;

	void _clear_client() {
		peer = Ref<StreamPeer>();
		ssl = Ref<StreamPeerSSL>();
		tcp = Ref<StreamPeerTCP>();
		memset(req_buf, 0, sizeof(req_buf));
		time = 0;
		req_pos = 0;
	}

	void _set_internal_certs(Ref<Crypto> p_crypto) {
		const String cache_path = EditorPaths::get_singleton()->get_cache_dir();
		const String key_path = cache_path.plus_file("html5_server.key");
		const String crt_path = cache_path.plus_file("html5_server.crt");
		bool regen = !FileAccess::exists(key_path) || !FileAccess::exists(crt_path);
		if (!regen) {
			key = Ref<CryptoKey>(CryptoKey::create());
			cert = Ref<X509Certificate>(X509Certificate::create());
			if (key->load(key_path) != OK || cert->load(crt_path) != OK) {
				regen = true;
			}
		}
		if (regen) {
			key = p_crypto->generate_rsa(2048);
			key->save(key_path);
			cert = p_crypto->generate_self_signed_certificate(key, "CN=godot-debug.local,O=A Game Dev,C=XXA", "20140101000000", "20340101000000");
			cert->save(crt_path);
		}
	}

public:
	EditorHTTPServer() {
		mimes["html"] = "text/html";
		mimes["js"] = "application/javascript";
		mimes["json"] = "application/json";
		mimes["pck"] = "application/octet-stream";
		mimes["png"] = "image/png";
		mimes["svg"] = "image/svg";
		mimes["wasm"] = "application/wasm";
		server.instantiate();
		stop();
	}

	void stop() {
		server->stop();
		_clear_client();
	}

	Error listen(int p_port, IPAddress p_address, bool p_use_ssl, String p_ssl_key, String p_ssl_cert) {
		use_ssl = p_use_ssl;
		if (use_ssl) {
			Ref<Crypto> crypto = Crypto::create();
			if (crypto.is_null()) {
				return ERR_UNAVAILABLE;
			}
			if (!p_ssl_key.is_empty() && !p_ssl_cert.is_empty()) {
				key = Ref<CryptoKey>(CryptoKey::create());
				Error err = key->load(p_ssl_key);
				ERR_FAIL_COND_V(err != OK, err);
				cert = Ref<X509Certificate>(X509Certificate::create());
				err = cert->load(p_ssl_cert);
				ERR_FAIL_COND_V(err != OK, err);
			} else {
				_set_internal_certs(crypto);
			}
		}
		return server->listen(p_port, p_address);
	}

	bool is_listening() const {
		return server->is_listening();
	}

	void _send_response() {
		Vector<String> psa = String((char *)req_buf).split("\r\n");
		int len = psa.size();
		ERR_FAIL_COND_MSG(len < 4, "Not enough response headers, got: " + itos(len) + ", expected >= 4.");

		Vector<String> req = psa[0].split(" ", false);
		ERR_FAIL_COND_MSG(req.size() < 2, "Invalid protocol or status code.");

		// Wrong protocol
		ERR_FAIL_COND_MSG(req[0] != "GET" || req[2] != "HTTP/1.1", "Invalid method or HTTP version.");

		const int query_index = req[1].find_char('?');
		const String path = (query_index == -1) ? req[1] : req[1].substr(0, query_index);

		const String req_file = path.get_file();
		const String req_ext = path.get_extension();
		const String cache_path = EditorPaths::get_singleton()->get_cache_dir().plus_file("web");
		const String filepath = cache_path.plus_file(req_file);

		if (!mimes.has(req_ext) || !FileAccess::exists(filepath)) {
			String s = "HTTP/1.1 404 Not Found\r\n";
			s += "Connection: Close\r\n";
			s += "\r\n";
			CharString cs = s.utf8();
			peer->put_data((const uint8_t *)cs.get_data(), cs.size() - 1);
			return;
		}
		const String ctype = mimes[req_ext];

		FileAccess *f = FileAccess::open(filepath, FileAccess::READ);
		ERR_FAIL_COND(!f);
		String s = "HTTP/1.1 200 OK\r\n";
		s += "Connection: Close\r\n";
		s += "Content-Type: " + ctype + "\r\n";
		s += "Access-Control-Allow-Origin: *\r\n";
		s += "Cross-Origin-Opener-Policy: same-origin\r\n";
		s += "Cross-Origin-Embedder-Policy: require-corp\r\n";
		s += "Cache-Control: no-store, max-age=0\r\n";
		s += "\r\n";
		CharString cs = s.utf8();
		Error err = peer->put_data((const uint8_t *)cs.get_data(), cs.size() - 1);
		if (err != OK) {
			memdelete(f);
			ERR_FAIL();
		}

		while (true) {
			uint8_t bytes[4096];
			uint64_t read = f->get_buffer(bytes, 4096);
			if (read == 0) {
				break;
			}
			err = peer->put_data(bytes, read);
			if (err != OK) {
				memdelete(f);
				ERR_FAIL();
			}
		}
		memdelete(f);
	}

	void poll() {
		if (!server->is_listening()) {
			return;
		}
		if (tcp.is_null()) {
			if (!server->is_connection_available()) {
				return;
			}
			tcp = server->take_connection();
			peer = tcp;
			time = OS::get_singleton()->get_ticks_usec();
		}
		if (OS::get_singleton()->get_ticks_usec() - time > 1000000) {
			_clear_client();
			return;
		}
		if (tcp->get_status() != StreamPeerTCP::STATUS_CONNECTED) {
			return;
		}

		if (use_ssl) {
			if (ssl.is_null()) {
				ssl = Ref<StreamPeerSSL>(StreamPeerSSL::create());
				peer = ssl;
				ssl->set_blocking_handshake_enabled(false);
				if (ssl->accept_stream(tcp, key, cert) != OK) {
					_clear_client();
					return;
				}
			}
			ssl->poll();
			if (ssl->get_status() == StreamPeerSSL::STATUS_HANDSHAKING) {
				// Still handshaking, keep waiting.
				return;
			}
			if (ssl->get_status() != StreamPeerSSL::STATUS_CONNECTED) {
				_clear_client();
				return;
			}
		}

		while (true) {
			char *r = (char *)req_buf;
			int l = req_pos - 1;
			if (l > 3 && r[l] == '\n' && r[l - 1] == '\r' && r[l - 2] == '\n' && r[l - 3] == '\r') {
				_send_response();
				_clear_client();
				return;
			}

			int read = 0;
			ERR_FAIL_COND(req_pos >= 4096);
			Error err = peer->get_partial_data(&req_buf[req_pos], 1, read);
			if (err != OK) {
				// Got an error
				_clear_client();
				return;
			} else if (read != 1) {
				// Busy, wait next poll
				return;
			}
			req_pos += read;
		}
	}
};

class EditorExportPlatformJavaScript : public EditorExportPlatform {
	GDCLASS(EditorExportPlatformJavaScript, EditorExportPlatform);

	Ref<ImageTexture> logo;
	Ref<ImageTexture> run_icon;
	Ref<ImageTexture> stop_icon;
	int menu_options = 0;

	Ref<EditorHTTPServer> server;
	bool server_quit = false;
	Mutex server_lock;
	Thread server_thread;

	enum ExportMode {
		EXPORT_MODE_NORMAL = 0,
		EXPORT_MODE_THREADS = 1,
		EXPORT_MODE_GDNATIVE = 2,
	};

	String _get_template_name(ExportMode p_mode, bool p_debug) const {
		String name = "webassembly";
		switch (p_mode) {
			case EXPORT_MODE_THREADS:
				name += "_threads";
				break;
			case EXPORT_MODE_GDNATIVE:
				name += "_gdnative";
				break;
			default:
				break;
		}
		if (p_debug) {
			name += "_debug.zip";
		} else {
			name += "_release.zip";
		}
		return name;
	}

	Ref<Image> _get_project_icon() const {
		Ref<Image> icon;
		icon.instantiate();
		const String icon_path = String(GLOBAL_GET("application/config/icon")).strip_edges();
		if (icon_path.is_empty() || ImageLoader::load_image(icon_path, icon) != OK) {
			return EditorNode::get_singleton()->get_editor_theme()->get_icon("DefaultProjectIcon", "EditorIcons")->get_image();
		}
		return icon;
	}

	Ref<Image> _get_project_splash() const {
		Ref<Image> splash;
		splash.instantiate();
		const String splash_path = String(GLOBAL_GET("application/boot_splash/image")).strip_edges();
		if (splash_path.is_empty() || ImageLoader::load_image(splash_path, splash) != OK) {
			return Ref<Image>(memnew(Image(boot_splash_png)));
		}
		return splash;
	}

	Error _extract_template(const String &p_template, const String &p_dir, const String &p_name, bool pwa);
	void _replace_strings(Map<String, String> p_replaces, Vector<uint8_t> &r_template);
	void _fix_html(Vector<uint8_t> &p_html, const Ref<EditorExportPreset> &p_preset, const String &p_name, bool p_debug, int p_flags, const Vector<SharedObject> p_shared_objects, const Dictionary &p_file_sizes);
	Error _add_manifest_icon(const String &p_path, const String &p_icon, int p_size, Array &r_arr);
	Error _build_pwa(const Ref<EditorExportPreset> &p_preset, const String p_path, const Vector<SharedObject> &p_shared_objects);
	Error _write_or_error(const uint8_t *p_content, int p_len, String p_path);

	static void _server_thread_poll(void *data);

public:
	virtual void get_preset_features(const Ref<EditorExportPreset> &p_preset, List<String> *r_features) override;

	virtual void get_export_options(List<ExportOption> *r_options) override;

	virtual String get_name() const override;
	virtual String get_os_name() const override;
	virtual Ref<Texture2D> get_logo() const override;

	virtual bool can_export(const Ref<EditorExportPreset> &p_preset, String &r_error, bool &r_missing_templates) const override;
	virtual List<String> get_binary_extensions(const Ref<EditorExportPreset> &p_preset) const override;
	virtual Error export_project(const Ref<EditorExportPreset> &p_preset, bool p_debug, const String &p_path, int p_flags = 0) override;

	virtual bool poll_export() override;
	virtual int get_options_count() const override;
	virtual String get_option_label(int p_index) const override { return p_index ? TTR("Stop HTTP Server") : TTR("Run in Browser"); }
	virtual String get_option_tooltip(int p_index) const override { return p_index ? TTR("Stop HTTP Server") : TTR("Run exported HTML in the system's default browser."); }
	virtual Ref<ImageTexture> get_option_icon(int p_index) const override;
	virtual Error run(const Ref<EditorExportPreset> &p_preset, int p_option, int p_debug_flags) override;
	virtual Ref<Texture2D> get_run_icon() const override;

	virtual void get_platform_features(List<String> *r_features) override {
		r_features->push_back("web");
		r_features->push_back(get_os_name());
	}

	virtual void resolve_platform_feature_priorities(const Ref<EditorExportPreset> &p_preset, Set<String> &p_features) override {
	}

	String get_debug_protocol() const override { return "ws://"; }

	EditorExportPlatformJavaScript();
	~EditorExportPlatformJavaScript();
};

Error EditorExportPlatformJavaScript::_extract_template(const String &p_template, const String &p_dir, const String &p_name, bool pwa) {
	FileAccess *src_f = nullptr;
	zlib_filefunc_def io = zipio_create_io_from_file(&src_f);
	unzFile pkg = unzOpen2(p_template.utf8().get_data(), &io);

	if (!pkg) {
		EditorNode::get_singleton()->show_warning(TTR("Could not open template for export:") + "\n" + p_template);
		return ERR_FILE_NOT_FOUND;
	}

	if (unzGoToFirstFile(pkg) != UNZ_OK) {
		EditorNode::get_singleton()->show_warning(TTR("Invalid export template:") + "\n" + p_template);
		unzClose(pkg);
		return ERR_FILE_CORRUPT;
	}

	do {
		//get filename
		unz_file_info info;
		char fname[16384];
		unzGetCurrentFileInfo(pkg, &info, fname, 16384, nullptr, 0, nullptr, 0);

		String file = fname;

		// Skip service worker and offline page if not exporting pwa.
		if (!pwa && (file == "godot.service.worker.js" || file == "godot.offline.html")) {
			continue;
		}
		Vector<uint8_t> data;
		data.resize(info.uncompressed_size);

		//read
		unzOpenCurrentFile(pkg);
		unzReadCurrentFile(pkg, data.ptrw(), data.size());
		unzCloseCurrentFile(pkg);

		//write
		String dst = p_dir.plus_file(file.replace("godot", p_name));
		FileAccess *f = FileAccess::open(dst, FileAccess::WRITE);
		if (!f) {
			EditorNode::get_singleton()->show_warning(TTR("Could not write file:") + "\n" + dst);
			unzClose(pkg);
			return ERR_FILE_CANT_WRITE;
		}
		f->store_buffer(data.ptr(), data.size());
		memdelete(f);

	} while (unzGoToNextFile(pkg) == UNZ_OK);
	unzClose(pkg);
	return OK;
}

Error EditorExportPlatformJavaScript::_write_or_error(const uint8_t *p_content, int p_size, String p_path) {
	FileAccess *f = FileAccess::open(p_path, FileAccess::WRITE);
	if (!f) {
		EditorNode::get_singleton()->show_warning(TTR("Could not write file:") + "\n" + p_path);
		return ERR_FILE_CANT_WRITE;
	}
	f->store_buffer(p_content, p_size);
	memdelete(f);
	return OK;
}

void EditorExportPlatformJavaScript::_replace_strings(Map<String, String> p_replaces, Vector<uint8_t> &r_template) {
	String str_template = String::utf8(reinterpret_cast<const char *>(r_template.ptr()), r_template.size());
	String out;
	Vector<String> lines = str_template.split("\n");
	for (int i = 0; i < lines.size(); i++) {
		String current_line = lines[i];
		for (Map<String, String>::Element *E = p_replaces.front(); E; E = E->next()) {
			current_line = current_line.replace(E->key(), E->get());
		}
		out += current_line + "\n";
	}
	CharString cs = out.utf8();
	r_template.resize(cs.length());
	for (int i = 0; i < cs.length(); i++) {
		r_template.write[i] = cs[i];
	}
}

void EditorExportPlatformJavaScript::_fix_html(Vector<uint8_t> &p_html, const Ref<EditorExportPreset> &p_preset, const String &p_name, bool p_debug, int p_flags, const Vector<SharedObject> p_shared_objects, const Dictionary &p_file_sizes) {
	// Engine.js config
	Dictionary config;
	Array libs;
	for (int i = 0; i < p_shared_objects.size(); i++) {
		libs.push_back(p_shared_objects[i].path.get_file());
	}
	Vector<String> flags;
	gen_export_flags(flags, p_flags & (~DEBUG_FLAG_DUMB_CLIENT));
	Array args;
	for (int i = 0; i < flags.size(); i++) {
		args.push_back(flags[i]);
	}
	config["canvasResizePolicy"] = p_preset->get("html/canvas_resize_policy");
	config["experimentalVK"] = p_preset->get("html/experimental_virtual_keyboard");
	config["gdnativeLibs"] = libs;
	config["executable"] = p_name;
	config["args"] = args;
	config["fileSizes"] = p_file_sizes;

	String head_include;
	if (p_preset->get("html/export_icon")) {
		head_include += "<link id='-gd-engine-icon' rel='icon' type='image/png' href='" + p_name + ".icon.png' />\n";
		head_include += "<link rel='apple-touch-icon' href='" + p_name + ".apple-touch-icon.png'/>\n";
	}
	if (p_preset->get("progressive_web_app/enabled")) {
		head_include += "<link rel='manifest' href='" + p_name + ".manifest.json'>\n";
		head_include += "<script type='application/javascript'>window.addEventListener('load', () => {if ('serviceWorker' in navigator) {navigator.serviceWorker.register('" +
						p_name + ".service.worker.js');}});</script>\n";
	}

	// Replaces HTML string
	const String str_config = Variant(config).to_json_string();
	const String custom_head_include = p_preset->get("html/head_include");
	Map<String, String> replaces;
	replaces["$GODOT_URL"] = p_name + ".js";
	replaces["$GODOT_PROJECT_NAME"] = ProjectSettings::get_singleton()->get_setting("application/config/name");
	replaces["$GODOT_HEAD_INCLUDE"] = head_include + custom_head_include;
	replaces["$GODOT_CONFIG"] = str_config;
	_replace_strings(replaces, p_html);
}

Error EditorExportPlatformJavaScript::_add_manifest_icon(const String &p_path, const String &p_icon, int p_size, Array &r_arr) {
	const String name = p_path.get_file().get_basename();
	const String icon_name = vformat("%s.%dx%d.png", name, p_size, p_size);
	const String icon_dest = p_path.get_base_dir().plus_file(icon_name);

	Ref<Image> icon;
	if (!p_icon.is_empty()) {
		icon.instantiate();
		const Error err = ImageLoader::load_image(p_icon, icon);
		if (err != OK) {
			EditorNode::get_singleton()->show_warning(TTR("Could not read file:") + "\n" + p_icon);
			return err;
		}
		if (icon->get_width() != p_size || icon->get_height() != p_size) {
			icon->resize(p_size, p_size);
		}
	} else {
		icon = _get_project_icon();
		icon->resize(p_size, p_size);
	}
	const Error err = icon->save_png(icon_dest);
	if (err != OK) {
		EditorNode::get_singleton()->show_warning(TTR("Could not write file:") + "\n" + icon_dest);
		return err;
	}
	Dictionary icon_dict;
	icon_dict["sizes"] = vformat("%dx%d", p_size, p_size);
	icon_dict["type"] = "image/png";
	icon_dict["src"] = icon_name;
	r_arr.push_back(icon_dict);
	return err;
}

Error EditorExportPlatformJavaScript::_build_pwa(const Ref<EditorExportPreset> &p_preset, const String p_path, const Vector<SharedObject> &p_shared_objects) {
	// Service worker
	const String dir = p_path.get_base_dir();
	const String name = p_path.get_file().get_basename();
	const ExportMode mode = (ExportMode)(int)p_preset->get("variant/export_type");
	Map<String, String> replaces;
	replaces["@GODOT_VERSION@"] = "1";
	replaces["@GODOT_NAME@"] = name;
	replaces["@GODOT_OFFLINE_PAGE@"] = name + ".offline.html";
	Array files;
	replaces["@GODOT_OPT_CACHE@"] = Variant(files).to_json_string();
	files.push_back(name + ".html");
	files.push_back(name + ".js");
	files.push_back(name + ".wasm");
	files.push_back(name + ".pck");
	files.push_back(name + ".offline.html");
	if (p_preset->get("html/export_icon")) {
		files.push_back(name + ".icon.png");
		files.push_back(name + ".apple-touch-icon.png");
	}
	if (mode == EXPORT_MODE_THREADS) {
		files.push_back(name + ".worker.js");
		files.push_back(name + ".audio.worklet.js");
	} else if (mode == EXPORT_MODE_GDNATIVE) {
		files.push_back(name + ".side.wasm");
		for (int i = 0; i < p_shared_objects.size(); i++) {
			files.push_back(p_shared_objects[i].path.get_file());
		}
	}
	replaces["@GODOT_CACHE@"] = Variant(files).to_json_string();

	const String sw_path = dir.plus_file(name + ".service.worker.js");
	Vector<uint8_t> sw;
	{
		FileAccess *f = FileAccess::open(sw_path, FileAccess::READ);
		if (!f) {
			EditorNode::get_singleton()->show_warning(TTR("Could not read file:") + "\n" + sw_path);
			return ERR_FILE_CANT_READ;
		}
		sw.resize(f->get_length());
		f->get_buffer(sw.ptrw(), sw.size());
		memdelete(f);
		f = nullptr;
	}
	_replace_strings(replaces, sw);
	Error err = _write_or_error(sw.ptr(), sw.size(), dir.plus_file(name + ".service.worker.js"));
	if (err != OK) {
		return err;
	}

	// Custom offline page
	const String offline_page = p_preset->get("progressive_web_app/offline_page");
	if (!offline_page.is_empty()) {
		DirAccess *da = DirAccess::create(DirAccess::ACCESS_FILESYSTEM);
		const String offline_dest = dir.plus_file(name + ".offline.html");
		err = da->copy(ProjectSettings::get_singleton()->globalize_path(offline_page), offline_dest);
		if (err != OK) {
			EditorNode::get_singleton()->show_warning(TTR("Could not read file:") + "\n" + offline_dest);
			return err;
		}
	}

	// Manifest
	const char *modes[4] = { "fullscreen", "standalone", "minimal-ui", "browser" };
	const char *orientations[3] = { "any", "landscape", "portrait" };
	const int display = CLAMP(int(p_preset->get("progressive_web_app/display")), 0, 4);
	const int orientation = CLAMP(int(p_preset->get("progressive_web_app/orientation")), 0, 3);

	Dictionary manifest;
	String proj_name = ProjectSettings::get_singleton()->get_setting("application/config/name");
	if (proj_name.is_empty()) {
		proj_name = "Godot Game";
	}
	manifest["name"] = proj_name;
	manifest["start_url"] = "./" + name + ".html";
	manifest["display"] = String::utf8(modes[display]);
	manifest["orientation"] = String::utf8(orientations[orientation]);
	manifest["background_color"] = "#" + p_preset->get("progressive_web_app/background_color").operator Color().to_html(false);

	Array icons_arr;
	const String icon144_path = p_preset->get("progressive_web_app/icon_144x144");
	err = _add_manifest_icon(p_path, icon144_path, 144, icons_arr);
	if (err != OK) {
		return err;
	}
	const String icon180_path = p_preset->get("progressive_web_app/icon_180x180");
	err = _add_manifest_icon(p_path, icon180_path, 180, icons_arr);
	if (err != OK) {
		return err;
	}
	const String icon512_path = p_preset->get("progressive_web_app/icon_512x512");
	err = _add_manifest_icon(p_path, icon512_path, 512, icons_arr);
	if (err != OK) {
		return err;
	}
	manifest["icons"] = icons_arr;

	CharString cs = Variant(manifest).to_json_string().utf8();
	err = _write_or_error((const uint8_t *)cs.get_data(), cs.length(), dir.plus_file(name + ".manifest.json"));
	if (err != OK) {
		return err;
	}

	return OK;
}

void EditorExportPlatformJavaScript::get_preset_features(const Ref<EditorExportPreset> &p_preset, List<String> *r_features) {
	if (p_preset->get("vram_texture_compression/for_desktop")) {
		r_features->push_back("s3tc");
	}

	if (p_preset->get("vram_texture_compression/for_mobile")) {
		String driver = ProjectSettings::get_singleton()->get("rendering/driver/driver_name");
		if (driver == "GLES2") {
			r_features->push_back("etc");
		} else if (driver == "Vulkan") {
			// FIXME: Review if this is correct.
			r_features->push_back("etc2");
		}
	}
	ExportMode mode = (ExportMode)(int)p_preset->get("variant/export_type");
	if (mode == EXPORT_MODE_THREADS) {
		r_features->push_back("threads");
	} else if (mode == EXPORT_MODE_GDNATIVE) {
		r_features->push_back("wasm32");
	}
}

void EditorExportPlatformJavaScript::get_export_options(List<ExportOption> *r_options) {
	r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "custom_template/debug", PROPERTY_HINT_GLOBAL_FILE, "*.zip"), ""));
	r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "custom_template/release", PROPERTY_HINT_GLOBAL_FILE, "*.zip"), ""));

	r_options->push_back(ExportOption(PropertyInfo(Variant::INT, "variant/export_type", PROPERTY_HINT_ENUM, "Regular,Threads,GDNative"), 0)); // Export type.
	r_options->push_back(ExportOption(PropertyInfo(Variant::BOOL, "vram_texture_compression/for_desktop"), true)); // S3TC
	r_options->push_back(ExportOption(PropertyInfo(Variant::BOOL, "vram_texture_compression/for_mobile"), false)); // ETC or ETC2, depending on renderer

	r_options->push_back(ExportOption(PropertyInfo(Variant::BOOL, "html/export_icon"), true));
	r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "html/custom_html_shell", PROPERTY_HINT_FILE, "*.html"), ""));
	r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "html/head_include", PROPERTY_HINT_MULTILINE_TEXT), ""));
	r_options->push_back(ExportOption(PropertyInfo(Variant::INT, "html/canvas_resize_policy", PROPERTY_HINT_ENUM, "None,Project,Adaptive"), 2));
	r_options->push_back(ExportOption(PropertyInfo(Variant::BOOL, "html/experimental_virtual_keyboard"), false));
	r_options->push_back(ExportOption(PropertyInfo(Variant::BOOL, "progressive_web_app/enabled"), false));
	r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "progressive_web_app/offline_page", PROPERTY_HINT_FILE, "*.html"), ""));
	r_options->push_back(ExportOption(PropertyInfo(Variant::INT, "progressive_web_app/display", PROPERTY_HINT_ENUM, "Fullscreen,Standalone,Minimal UI,Browser"), 1));
	r_options->push_back(ExportOption(PropertyInfo(Variant::INT, "progressive_web_app/orientation", PROPERTY_HINT_ENUM, "Any,Landscape,Portrait"), 0));
	r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "progressive_web_app/icon_144x144", PROPERTY_HINT_FILE, "*.png,*.webp,*.svg,*.svgz"), ""));
	r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "progressive_web_app/icon_180x180", PROPERTY_HINT_FILE, "*.png,*.webp,*.svg,*.svgz"), ""));
	r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "progressive_web_app/icon_512x512", PROPERTY_HINT_FILE, "*.png,*.webp,*.svg,*.svgz"), ""));
	r_options->push_back(ExportOption(PropertyInfo(Variant::COLOR, "progressive_web_app/background_color", PROPERTY_HINT_COLOR_NO_ALPHA), Color()));
}

String EditorExportPlatformJavaScript::get_name() const {
	return "HTML5";
}

String EditorExportPlatformJavaScript::get_os_name() const {
	return "HTML5";
}

Ref<Texture2D> EditorExportPlatformJavaScript::get_logo() const {
	return logo;
}

bool EditorExportPlatformJavaScript::can_export(const Ref<EditorExportPreset> &p_preset, String &r_error, bool &r_missing_templates) const {
	String err;
	bool valid = false;
	ExportMode mode = (ExportMode)(int)p_preset->get("variant/export_type");

	// Look for export templates (first official, and if defined custom templates).
	bool dvalid = exists_export_template(_get_template_name(mode, true), &err);
	bool rvalid = exists_export_template(_get_template_name(mode, false), &err);

	if (p_preset->get("custom_template/debug") != "") {
		dvalid = FileAccess::exists(p_preset->get("custom_template/debug"));
		if (!dvalid) {
			err += TTR("Custom debug template not found.") + "\n";
		}
	}
	if (p_preset->get("custom_template/release") != "") {
		rvalid = FileAccess::exists(p_preset->get("custom_template/release"));
		if (!rvalid) {
			err += TTR("Custom release template not found.") + "\n";
		}
	}

	valid = dvalid || rvalid;
	r_missing_templates = !valid;

	// Validate the rest of the configuration.

	if (p_preset->get("vram_texture_compression/for_mobile")) {
		String etc_error = test_etc2();
		if (etc_error != String()) {
			valid = false;
			err += etc_error;
		}
	}

	if (!err.is_empty()) {
		r_error = err;
	}

	return valid;
}

List<String> EditorExportPlatformJavaScript::get_binary_extensions(const Ref<EditorExportPreset> &p_preset) const {
	List<String> list;
	list.push_back("html");
	return list;
}

Error EditorExportPlatformJavaScript::export_project(const Ref<EditorExportPreset> &p_preset, bool p_debug, const String &p_path, int p_flags) {
	ExportNotifier notifier(*this, p_preset, p_debug, p_path, p_flags);

	const String custom_debug = p_preset->get("custom_template/debug");
	const String custom_release = p_preset->get("custom_template/release");
	const String custom_html = p_preset->get("html/custom_html_shell");
	const bool export_icon = p_preset->get("html/export_icon");
	const bool pwa = p_preset->get("progressive_web_app/enabled");

	const String base_dir = p_path.get_base_dir();
	const String base_path = p_path.get_basename();
	const String base_name = p_path.get_file().get_basename();

	// Find the correct template
	String template_path = p_debug ? custom_debug : custom_release;
	template_path = template_path.strip_edges();
	if (template_path == String()) {
		ExportMode mode = (ExportMode)(int)p_preset->get("variant/export_type");
		template_path = find_export_template(_get_template_name(mode, p_debug));
	}

	if (!DirAccess::exists(base_dir)) {
		return ERR_FILE_BAD_PATH;
	}

	if (template_path != String() && !FileAccess::exists(template_path)) {
		EditorNode::get_singleton()->show_warning(TTR("Template file not found:") + "\n" + template_path);
		return ERR_FILE_NOT_FOUND;
	}

	// Export pck and shared objects
	Vector<SharedObject> shared_objects;
	String pck_path = base_path + ".pck";
	Error error = save_pack(p_preset, pck_path, &shared_objects);
	if (error != OK) {
		EditorNode::get_singleton()->show_warning(TTR("Could not write file:") + "\n" + pck_path);
		return error;
	}
	DirAccess *da = DirAccess::create(DirAccess::ACCESS_FILESYSTEM);
	for (int i = 0; i < shared_objects.size(); i++) {
		String dst = base_dir.plus_file(shared_objects[i].path.get_file());
		error = da->copy(shared_objects[i].path, dst);
		if (error != OK) {
			EditorNode::get_singleton()->show_warning(TTR("Could not write file:") + "\n" + shared_objects[i].path.get_file());
			memdelete(da);
			return error;
		}
	}
	memdelete(da);
	da = nullptr;

	// Extract templates.
	error = _extract_template(template_path, base_dir, base_name, pwa);
	if (error) {
		return error;
	}

	// Parse generated file sizes (pck and wasm, to help show a meaningful loading bar).
	Dictionary file_sizes;
	FileAccess *f = nullptr;
	f = FileAccess::open(pck_path, FileAccess::READ);
	if (f) {
		file_sizes[pck_path.get_file()] = (uint64_t)f->get_length();
		memdelete(f);
		f = nullptr;
	}
	f = FileAccess::open(base_path + ".wasm", FileAccess::READ);
	if (f) {
		file_sizes[base_name + ".wasm"] = (uint64_t)f->get_length();
		memdelete(f);
		f = nullptr;
	}

	// Read the HTML shell file (custom or from template).
	const String html_path = custom_html.is_empty() ? base_path + ".html" : custom_html;
	Vector<uint8_t> html;
	f = FileAccess::open(html_path, FileAccess::READ);
	if (!f) {
		EditorNode::get_singleton()->show_warning(TTR("Could not read HTML shell:") + "\n" + html_path);
		return ERR_FILE_CANT_READ;
	}
	html.resize(f->get_length());
	f->get_buffer(html.ptrw(), html.size());
	memdelete(f);
	f = nullptr;

	// Generate HTML file with replaced strings.
	_fix_html(html, p_preset, base_name, p_debug, p_flags, shared_objects, file_sizes);
	Error err = _write_or_error(html.ptr(), html.size(), p_path);
	if (err != OK) {
		return err;
	}
	html.resize(0);

	// Export splash (why?)
	Ref<Image> splash = _get_project_splash();
	const String splash_png_path = base_path + ".png";
	if (splash->save_png(splash_png_path) != OK) {
		EditorNode::get_singleton()->show_warning(TTR("Could not write file:") + "\n" + splash_png_path);
		return ERR_FILE_CANT_WRITE;
	}

	// Save a favicon that can be accessed without waiting for the project to finish loading.
	// This way, the favicon can be displayed immediately when loading the page.
	if (export_icon) {
		Ref<Image> favicon = _get_project_icon();
		const String favicon_png_path = base_path + ".icon.png";
		if (favicon->save_png(favicon_png_path) != OK) {
			EditorNode::get_singleton()->show_warning(TTR("Could not write file:") + "\n" + favicon_png_path);
			return ERR_FILE_CANT_WRITE;
		}
		favicon->resize(180, 180);
		const String apple_icon_png_path = base_path + ".apple-touch-icon.png";
		if (favicon->save_png(apple_icon_png_path) != OK) {
			EditorNode::get_singleton()->show_warning(TTR("Could not write file:") + "\n" + apple_icon_png_path);
			return ERR_FILE_CANT_WRITE;
		}
	}

	// Generate the PWA worker and manifest
	if (pwa) {
		err = _build_pwa(p_preset, p_path, shared_objects);
		if (err != OK) {
			return err;
		}
	}

	return OK;
}

bool EditorExportPlatformJavaScript::poll_export() {
	Ref<EditorExportPreset> preset;

	for (int i = 0; i < EditorExport::get_singleton()->get_export_preset_count(); i++) {
		Ref<EditorExportPreset> ep = EditorExport::get_singleton()->get_export_preset(i);
		if (ep->is_runnable() && ep->get_platform() == this) {
			preset = ep;
			break;
		}
	}

	int prev = menu_options;
	menu_options = preset.is_valid();
	if (server->is_listening()) {
		if (menu_options == 0) {
			MutexLock lock(server_lock);
			server->stop();
		} else {
			menu_options += 1;
		}
	}
	return menu_options != prev;
}

Ref<ImageTexture> EditorExportPlatformJavaScript::get_option_icon(int p_index) const {
	return p_index == 1 ? stop_icon : EditorExportPlatform::get_option_icon(p_index);
}

int EditorExportPlatformJavaScript::get_options_count() const {
	return menu_options;
}

Error EditorExportPlatformJavaScript::run(const Ref<EditorExportPreset> &p_preset, int p_option, int p_debug_flags) {
	if (p_option == 1) {
		MutexLock lock(server_lock);
		server->stop();
		return OK;
	}

	const String dest = EditorPaths::get_singleton()->get_cache_dir().plus_file("web");
	DirAccessRef da = DirAccess::create(DirAccess::ACCESS_FILESYSTEM);
	if (!da->dir_exists(dest)) {
		Error err = da->make_dir_recursive(dest);
		if (err != OK) {
			EditorNode::get_singleton()->show_warning(TTR("Could not create HTTP server directory:") + "\n" + dest);
			return err;
		}
	}
	const String basepath = dest.plus_file("tmp_js_export");
	Error err = export_project(p_preset, true, basepath + ".html", p_debug_flags);
	if (err != OK) {
		// Export generates several files, clean them up on failure.
		DirAccess::remove_file_or_error(basepath + ".html");
		DirAccess::remove_file_or_error(basepath + ".offline.html");
		DirAccess::remove_file_or_error(basepath + ".js");
		DirAccess::remove_file_or_error(basepath + ".worker.js");
		DirAccess::remove_file_or_error(basepath + ".audio.worklet.js");
		DirAccess::remove_file_or_error(basepath + ".service.worker.js");
		DirAccess::remove_file_or_error(basepath + ".pck");
		DirAccess::remove_file_or_error(basepath + ".png");
		DirAccess::remove_file_or_error(basepath + ".side.wasm");
		DirAccess::remove_file_or_error(basepath + ".wasm");
		DirAccess::remove_file_or_error(basepath + ".icon.png");
		DirAccess::remove_file_or_error(basepath + ".apple-touch-icon.png");
		return err;
	}

	const uint16_t bind_port = EDITOR_GET("export/web/http_port");
	// Resolve host if needed.
	const String bind_host = EDITOR_GET("export/web/http_host");
	IPAddress bind_ip;
	if (bind_host.is_valid_ip_address()) {
		bind_ip = bind_host;
	} else {
		bind_ip = IP::get_singleton()->resolve_hostname(bind_host);
	}
	ERR_FAIL_COND_V_MSG(!bind_ip.is_valid(), ERR_INVALID_PARAMETER, "Invalid editor setting 'export/web/http_host': '" + bind_host + "'. Try using '127.0.0.1'.");

	const bool use_ssl = EDITOR_GET("export/web/use_ssl");
	const String ssl_key = EDITOR_GET("export/web/ssl_key");
	const String ssl_cert = EDITOR_GET("export/web/ssl_certificate");

	// Restart server.
	{
		MutexLock lock(server_lock);

		server->stop();
		err = server->listen(bind_port, bind_ip, use_ssl, ssl_key, ssl_cert);
	}
	if (err != OK) {
		EditorNode::get_singleton()->show_warning(TTR("Error starting HTTP server:") + "\n" + itos(err));
		return err;
	}

	OS::get_singleton()->shell_open(String((use_ssl ? "https://" : "http://") + bind_host + ":" + itos(bind_port) + "/tmp_js_export.html"));
	// FIXME: Find out how to clean up export files after running the successfully
	// exported game. Might not be trivial.
	return OK;
}

Ref<Texture2D> EditorExportPlatformJavaScript::get_run_icon() const {
	return run_icon;
}

void EditorExportPlatformJavaScript::_server_thread_poll(void *data) {
	EditorExportPlatformJavaScript *ej = (EditorExportPlatformJavaScript *)data;
	while (!ej->server_quit) {
		OS::get_singleton()->delay_usec(1000);
		{
			MutexLock lock(ej->server_lock);
			ej->server->poll();
		}
	}
}

EditorExportPlatformJavaScript::EditorExportPlatformJavaScript() {
	server.instantiate();
	server_thread.start(_server_thread_poll, this);

	Ref<Image> img = memnew(Image(_javascript_logo));
	logo.instantiate();
	logo->create_from_image(img);

	img = Ref<Image>(memnew(Image(_javascript_run_icon)));
	run_icon.instantiate();
	run_icon->create_from_image(img);

	Ref<Theme> theme = EditorNode::get_singleton()->get_editor_theme();
	if (theme.is_valid()) {
		stop_icon = theme->get_icon("Stop", "EditorIcons");
	} else {
		stop_icon.instantiate();
	}
}

EditorExportPlatformJavaScript::~EditorExportPlatformJavaScript() {
	server->stop();
	server_quit = true;
	server_thread.wait_to_finish();
}

void register_javascript_exporter() {
	EDITOR_DEF("export/web/http_host", "localhost");
	EDITOR_DEF("export/web/http_port", 8060);
	EDITOR_DEF("export/web/use_ssl", false);
	EDITOR_DEF("export/web/ssl_key", "");
	EDITOR_DEF("export/web/ssl_certificate", "");
	EditorSettings::get_singleton()->add_property_hint(PropertyInfo(Variant::INT, "export/web/http_port", PROPERTY_HINT_RANGE, "1,65535,1"));
	EditorSettings::get_singleton()->add_property_hint(PropertyInfo(Variant::STRING, "export/web/ssl_key", PROPERTY_HINT_GLOBAL_FILE, "*.key"));
	EditorSettings::get_singleton()->add_property_hint(PropertyInfo(Variant::STRING, "export/web/ssl_certificate", PROPERTY_HINT_GLOBAL_FILE, "*.crt,*.pem"));

	Ref<EditorExportPlatformJavaScript> platform;
	platform.instantiate();
	EditorExport::get_singleton()->add_export_platform(platform);
}