import { ensureEndingSlash, isLinkHttp } from "vuepress/shared";
import { isMobile, isSafari, isiPad } from "@vuepress/helper/client";
import { withBase } from "vuepress/client";
import { pluginOptions } from "../options.js";

//#region src/client/composables/pdf.ts
function queryStringify(options) {
	const { page, noToolbar, zoom } = options;
	let queryString = [
		`page=${page}`,
		`toolbar=${noToolbar ? 0 : 1}`,
		`zoom=${zoom}`
	].join("&");
	if (queryString) queryString = `#${queryString}`;
	return queryString;
}
function renderPDF(el, url, embedType, options) {
	if (!pluginOptions.pdf) return;
	url = isLinkHttp(url) ? url : new URL(withBase(url), typeof location !== "undefined" ? location.href : "").toString();
	const pdfOptions = pluginOptions.pdf === true ? {} : pluginOptions.pdf;
	pdfOptions.pdfjsUrl ??= "https://static.pengzhanbo.cn/pdfjs/";
	const pdfjsUrl = `${ensureEndingSlash(withBase(pdfOptions.pdfjsUrl))}web/viewer.html`;
	const queryString = queryStringify(options);
	const source = embedType === "pdfjs" ? `${pdfjsUrl}?file=${url}${queryString}` : `${url}${queryString}`;
	const tagName = embedType === "pdfjs" || embedType === "iframe" ? "iframe" : "embed";
	el.innerHTML = "";
	const pdf = document.createElement(tagName);
	pdf.className = "pdf-viewer";
	pdf.type = "application/pdf";
	pdf.title = options.title || "PDF Viewer";
	pdf.src = source;
	if (pdf instanceof HTMLIFrameElement) pdf.allow = "fullscreen";
	el.appendChild(pdf);
}
function usePDF(el, url, options) {
	if (typeof window === "undefined" || !window?.navigator?.userAgent) return;
	const { navigator } = window;
	const { userAgent } = navigator;
	const isModernBrowser = typeof window.Promise === "function";
	const isMobileDevice = isiPad(userAgent) || isMobile(userAgent);
	const isSafariDesktop = !isMobileDevice && isSafari(userAgent);
	const isFirefoxWithPDFJS = !isMobileDevice && /firefox/iu.test(userAgent) && userAgent.split("rv:").length > 1 ? Number.parseInt(userAgent.split("rv:")[1].split(".")[0], 10) > 18 : false;
	const supportsPDFs = !isMobileDevice && (isModernBrowser || isFirefoxWithPDFJS);
	if (!url) return;
	if (supportsPDFs || !isMobileDevice) return renderPDF(el, url, isSafariDesktop ? "iframe" : "embed", options);
	return renderPDF(el, url, "pdfjs", options);
}

//#endregion
export { renderPDF, usePDF };