/*
 * Copyright 2010-2020 Gildas Lormeau
 * contact : gildas.lormeau <at> gmail.com
 * 
 * This file is part of SingleFile.
 *
 *   The code in this file is free software: you can redistribute it and/or 
 *   modify it under the terms of the GNU Affero General Public License 
 *   (GNU AGPL) as published by the Free Software Foundation, either version 3
 *   of the License, or (at your option) any later version.
 * 
 *   The code in this file is distributed in the hope that it will be useful, 
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of 
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero 
 *   General Public License for more details.
 *
 *   As additional permission under GNU AGPL version 3 section 7, you may 
 *   distribute UNMODIFIED VERSIONS OF THIS file without the copy of the GNU 
 *   AGPL normally required by section 4, provided you include this license 
 *   notice and a URL through which recipients can access the Corresponding 
 *   Source.
 */

/* global browser, window, addEventListener, removeEventListener, document, location, setTimeout, prompt, Node */

this.extension.core.content.bootstrap = this.extension.core.content.bootstrap || (() => {

	const singlefile = this.singlefile;
	const extension = this.extension;

	const MAX_CONTENT_SIZE = 32 * (1024 * 1024);

	let unloadListenerAdded, options, autoSaveEnabled, autoSaveTimeout, autoSavingPage, pageAutoSaved, previousLocationHref;
	extension.core.content.updatedResources = {};
	extension.core.content.visitDate = new Date();
	browser.runtime.sendMessage({ method: "autosave.init" }).then(message => {
		options = message.options;
		autoSaveEnabled = message.autoSaveEnabled;
		if (options && options.autoOpenEditor && detectSavedPage(document)) {
			if (document.readyState == "loading") {
				document.addEventListener("DOMContentLoaded", () => openEditor(document));
			} else {
				openEditor(document);
			}
		} else {
			refresh();
		}
	});
	browser.runtime.onMessage.addListener(message => {
		if ((autoSaveEnabled && message.method == "content.autosave") ||
			message.method == "content.maybeInit" ||
			message.method == "content.init" ||
			message.method == "content.openEditor" ||
			message.method == "devtools.resourceCommitted" ||
			message.method == "common.promptValueRequest") {
			return onMessage(message);
		}
	});
	document.addEventListener("DOMContentLoaded", init, false);
	return {};

	async function onMessage(message) {
		if (autoSaveEnabled && message.method == "content.autosave") {
			initAutoSavePage(message);
			return {};
		}
		if (message.method == "content.maybeInit") {
			init();
			return {};
		}
		if (message.method == "content.init") {
			options = message.options;
			autoSaveEnabled = message.autoSaveEnabled;
			refresh();
			return {};
		}
		if (message.method == "content.openEditor") {
			if (detectSavedPage(document)) {
				openEditor(document);
			} else {
				refresh();
			}
			return {};
		}
		if (message.method == "devtools.resourceCommitted") {
			extension.core.content.updatedResources[message.url] = { content: message.content, type: message.type, encoding: message.encoding };
			return {};
		}
		if (message.method == "common.promptValueRequest") {
			browser.runtime.sendMessage({ method: "tabs.promptValueResponse", value: prompt("SingleFile: " + message.promptMessage) });
			return {};
		}
	}

	function init() {
		if (previousLocationHref != location.href && !extension.core.processing) {
			pageAutoSaved = false;
			previousLocationHref = location.href;
			browser.runtime.sendMessage({ method: "tabs.init", savedPageDetected: detectSavedPage(document) });
			browser.runtime.sendMessage({ method: "ui.processInit" });
		}
	}

	async function initAutoSavePage(message) {
		options = message.options;
		if (document.readyState != "complete") {
			await new Promise(resolve => window.addEventListener("load", resolve));
		}
		await autoSavePage();
		if (options.autoSaveRepeat) {
			setTimeout(() => {
				if (autoSaveEnabled && !autoSavingPage) {
					pageAutoSaved = false;
					options.autoSaveDelay = 0;
					onMessage(message);
				}
			}, options.autoSaveRepeatDelay * 1000);
		}
	}

	async function autoSavePage() {
		const helper = singlefile.helper;
		if ((!autoSavingPage || autoSaveTimeout) && !pageAutoSaved) {
			autoSavingPage = true;
			if (options.autoSaveDelay && !autoSaveTimeout) {
				await new Promise(resolve => autoSaveTimeout = setTimeout(resolve, options.autoSaveDelay * 1000));
				await autoSavePage();
			} else {
				let frames = [];
				let framesSessionId;
				autoSaveTimeout = null;
				if (!options.removeFrames && window.frames && window.frames.length) {
					frames = await singlefile.processors.frameTree.getAsync(options);
				}
				framesSessionId = frames && frames.sessionId;
				if (options.userScriptEnabled && helper.waitForUserScript.callback) {
					await helper.waitForUserScript.callback(helper.ON_BEFORE_CAPTURE_EVENT_NAME);
				}
				const docData = helper.preProcessDoc(document, window, options);
				savePage(docData, frames);
				if (framesSessionId) {
					singlefile.processors.frameTree.cleanup(framesSessionId);
				}
				helper.postProcessDoc(document, docData.markedElements);
				if (options.userScriptEnabled && helper.waitForUserScript.callback) {
					await helper.waitForUserScript.callback(helper.ON_AFTER_CAPTURE_EVENT_NAME);
				}
				pageAutoSaved = true;
				autoSavingPage = false;
			}
		}
	}

	function refresh() {
		if (autoSaveEnabled && options && (options.autoSaveUnload || options.autoSaveLoadOrUnload)) {
			if (!unloadListenerAdded) {
				addEventListener("unload", onUnload);
				unloadListenerAdded = true;
			}
		} else {
			removeEventListener("unload", onUnload);
			unloadListenerAdded = false;
		}
	}

	function onUnload() {
		const helper = singlefile.helper;
		if (!pageAutoSaved || options.autoSaveUnload) {
			let frames = [];
			if (!options.removeFrames && window.frames && window.frames.length) {
				frames = singlefile.processors.frameTree.getSync(options);
			}
			if (options.userScriptEnabled && helper.waitForUserScript.callback) {
				helper.waitForUserScript.callback(helper.ON_BEFORE_CAPTURE_EVENT_NAME);
			}
			const docData = helper.preProcessDoc(document, window, options);
			savePage(docData, frames);
		}
	}

	function savePage(docData, frames) {
		const helper = singlefile.helper;
		const updatedResources = extension.core.content.updatedResources;
		const visitDate = extension.core.content.visitDate.getTime();
		Object.keys(updatedResources).forEach(url => updatedResources[url].retrieved = false);
		browser.runtime.sendMessage({
			method: "autosave.save",
			taskId: options.taskId,
			content: helper.serialize(document),
			canvases: docData.canvases,
			fonts: docData.fonts,
			stylesheets: docData.stylesheets,
			images: docData.images,
			posters: docData.posters,
			usedFonts: docData.usedFonts,
			shadowRoots: docData.shadowRoots,
			imports: docData.imports,
			referrer: docData.referrer,
			frames: frames,
			url: location.href,
			updatedResources,
			visitDate
		});
	}

	async function openEditor(document) {
		const infobarElement = document.querySelector("singlefile-infobar");
		if (infobarElement) {
			infobarElement.remove();
		}
		serializeShadowRoots(document);
		const content = singlefile.helper.serialize(document);
		for (let blockIndex = 0; blockIndex * MAX_CONTENT_SIZE < content.length; blockIndex++) {
			const message = {
				method: "editor.open",
				filename: decodeURIComponent(location.href.match(/^.*\/(.*)$/)[1])
			};
			message.truncated = content.length > MAX_CONTENT_SIZE;
			if (message.truncated) {
				message.finished = (blockIndex + 1) * MAX_CONTENT_SIZE > content.length;
				message.content = content.substring(blockIndex * MAX_CONTENT_SIZE, (blockIndex + 1) * MAX_CONTENT_SIZE);
			} else {
				message.content = content;
			}
			await browser.runtime.sendMessage(message);
		}
	}

	function detectSavedPage(document) {
		const helper = singlefile.helper;
		const firstDocumentChild = document.documentElement.firstChild;
		return firstDocumentChild.nodeType == Node.COMMENT_NODE &&
			(firstDocumentChild.textContent.includes(helper.COMMENT_HEADER) || firstDocumentChild.textContent.includes(helper.COMMENT_HEADER_LEGACY));
	}

	function serializeShadowRoots(node) {
		const SHADOW_MODE_ATTRIBUTE_NAME = "shadowmode";
		node.querySelectorAll("*").forEach(element => {
			const shadowRoot = singlefile.helper.getShadowRoot(element);
			if (shadowRoot) {
				serializeShadowRoots(shadowRoot);
				const templateElement = document.createElement("template");
				templateElement.setAttribute(SHADOW_MODE_ATTRIBUTE_NAME, "open");
				templateElement.appendChild(shadowRoot);
				element.appendChild(templateElement);
			}
		});
	}

})();