/** @format */

function m(o, e) {
	if (["link", "go"].includes(o))
		if (e) {
			const t = document.querySelector(e);
			t
				? t.scrollIntoView({ behavior: "smooth", block: "start" })
				: window.scrollTo({ top: 0 });
		} else window.scrollTo({ top: 0 });
}
function u(o) {
	const e = new URL(o || window.location.href).href;
	return e.endsWith("/") || e.includes(".") || e.includes("#") ? e : `${e}/`;
}
function E(o) {
	(!window.history.state || window.history.state.url !== o) &&
		window.history.pushState({ url: o }, "internalLink", o);
}
function k(o) {
	document
		.querySelector(o)
		.scrollIntoView({ behavior: "smooth", block: "start" });
}
function S(o) {
	const e = u();
	return { type: "popstate", next: e };
}
function F(o) {
	var t;
	let e;
	if (o.altKey || o.ctrlKey || o.metaKey || o.shiftKey)
		return { type: "disqualified" };
	for (let r = o.target; r.parentNode; r = r.parentNode)
		if (r.nodeName === "A") {
			e = r;
			break;
		}
	if (e && e.host !== location.host)
		return (e.target = "_blank"), { type: "external" };
	if (e && "cold" in (e == null ? void 0 : e.dataset))
		return { type: "disqualified" };
	if (e != null && e.hasAttribute("href")) {
		const r = e.getAttribute("href"),
			n = new URL(r, location.href);
		if ((o.preventDefault(), r != null && r.startsWith("#")))
			return k(r), { type: "scrolled" };
		const s = (t = r.match(/#([\w'-]+)\b/g)) == null ? void 0 : t[0],
			i = u(n.href),
			c = u();
		return { type: "link", next: i, prev: c, scrollId: s };
	} else return { type: "noop" };
}
function N(o) {
	return new DOMParser().parseFromString(o, "text/html");
}
function g(o) {
	document.body.querySelectorAll("[flamethrower-preserve]").forEach((t) => {
		let r = o.body.querySelector(
			'[flamethrower-preserve][id="' + t.id + '"]'
		);
		if (r) {
			const n = t.cloneNode(!0);
			r.replaceWith(n);
		}
	}),
		document.body.replaceWith(o.body);
}
function A(o) {
	const e = (i) =>
			Array.from(i.querySelectorAll('head>:not([rel="prefetch"]')),
		t = e(document),
		r = e(o),
		{ staleNodes: n, freshNodes: s } = L(t, r);
	n.forEach((i) => i.remove()), document.head.append(...s);
}
function L(o, e) {
	const t = [],
		r = [];
	let n = 0,
		s = 0;
	for (; n < o.length || s < e.length; ) {
		const i = o[n],
			c = e[s];
		if (i != null && i.isEqualNode(c)) {
			n++, s++;
			continue;
		}
		const a = i ? r.findIndex((l) => l.isEqualNode(i)) : -1;
		if (a !== -1) {
			r.splice(a, 1), n++;
			continue;
		}
		const h = c ? t.findIndex((l) => l.isEqualNode(c)) : -1;
		if (h !== -1) {
			t.splice(h, 1), s++;
			continue;
		}
		i && t.push(i), c && r.push(c), n++, s++;
	}
	return { staleNodes: t, freshNodes: r };
}
function b() {
	document.head.querySelectorAll("[data-reload]").forEach(v),
		document.body.querySelectorAll("script").forEach(v);
}
function v(o) {
	const e = document.createElement("script"),
		t = Array.from(o.attributes);
	for (const { name: r, value: n } of t) e[r] = n;
	e.append(o.textContent), o.replaceWith(e);
}
const x = {
	log: !1,
	pageTransitions: !1,
};
class q {
	constructor(e) {
		(this.opts = e),
			(this.enabled = !0),
			(this.prefetched = /* @__PURE__ */ new Set()),
			(this.opts = { ...x, ...(e != null ? e : {}) }),
			window != null && window.history
				? (document.addEventListener("click", (t) => this.onClick(t)),
				  window.addEventListener("popstate", (t) => this.onPop(t)),
				  this.prefetch())
				: (console.warn(
						"flamethrower router not supported in this browser or environment"
				  ),
				  (this.enabled = !1));
	}
	go(e) {
		const t = window.location.href,
			r = new URL(e, location.origin).href;
		return this.reconstructDOM({ type: "go", next: r, prev: t });
	}
	back() {
		window.history.back();
	}
	forward() {
		window.history.forward();
	}
	get allLinks() {
		return Array.from(document.links).filter(
			(e) =>
				e.href.includes(document.location.origin) &&
				!e.href.includes("#") &&
				e.href !==
					(document.location.href || document.location.href + "/") &&
				!this.prefetched.has(e.href)
		);
	}
	log(...e) {
		this.opts.log && console.log(...e);
	}
	prefetch() {
		if (this.opts.prefetch === "visible") this.prefetchVisible();
		else if (this.opts.prefetch === "hover") this.prefetchOnHover();
		else return;
	}
	prefetchOnHover() {
		this.allLinks.forEach((e) => {
			const t = e.getAttribute("href");
			e.addEventListener("pointerenter", () => this.createLink(t), {
				once: !0,
			});
		});
	}
	prefetchVisible() {
		const e = {
			root: null,
			rootMargin: "0px",
			threshold: 1,
		};
		"IntersectionObserver" in window &&
			(this.observer ||
				(this.observer = new IntersectionObserver((t, r) => {
					t.forEach((n) => {
						const s = n.target.getAttribute("href");
						if (this.prefetched.has(s)) {
							r.unobserve(n.target);
							return;
						}
						n.isIntersecting &&
							(this.createLink(s), r.unobserve(n.target));
					});
				}, e)),
			this.allLinks.forEach((t) => this.observer.observe(t)));
	}
	createLink(e) {
		const t = document.createElement("link");
		(t.rel = "prefetch"),
			(t.href = e),
			(t.as = "document"),
			(t.onload = () => this.log("\u{1F329}\uFE0F prefetched", e)),
			(t.onerror = (r) => this.log("\u{1F915} can't prefetch", e, r)),
			document.head.appendChild(t),
			this.prefetched.add(e);
	}
	onClick(e) {
		this.reconstructDOM(F(e));
	}
	onPop(e) {
		this.reconstructDOM(S());
	}
	async reconstructDOM({ type: e, next: t, prev: r, scrollId: n }) {
		if (!this.enabled) {
			this.log("router disabled");
			return;
		}
		try {
			if (
				(this.log("\u26A1", e),
				["popstate", "link", "go"].includes(e) && t !== r)
			) {
				this.opts.log && console.time("\u23F1\uFE0F"),
					window.dispatchEvent(
						new CustomEvent("flamethrower:router:fetch")
					),
					e != "popstate" && E(t);
				const i = await (
						await fetch(t, { headers: { "X-Flamethrower": "1" } })
							.then((a) => {
								const h = a.body.getReader(),
									l = parseInt(
										a.headers.get("Content-Length")
									);
								let d = 0;
								return new ReadableStream({
									start(f) {
										function p() {
											h.read().then(
												({ done: y, value: w }) => {
													if (y) {
														f.close();
														return;
													}
													(d += w.length),
														window.dispatchEvent(
															new CustomEvent(
																"flamethrower:router:fetch-progress",
																{
																	detail: {
																		progress:
																			Number.isNaN(
																				l
																			)
																				? 0
																				: (d /
																						l) *
																				  100,
																		received:
																			d,
																		length:
																			l ||
																			0,
																	},
																}
															)
														),
														f.enqueue(w),
														p();
												}
											);
										}
										p();
									},
								});
							})
							.then(
								(a) =>
									new Response(a, {
										headers: {
											"Content-Type": "text/html",
										},
									})
							)
					).text(),
					c = N(i);
				A(c),
					this.opts.pageTransitions &&
					document.createDocumentTransition
						? document.createDocumentTransition().start(() => {
								g(c), b(), m(e, n);
						  })
						: (g(c), b(), m(e, n)),
					window.dispatchEvent(
						new CustomEvent("flamethrower:router:end")
					),
					setTimeout(() => {
						this.prefetch();
					}, 200),
					this.opts.log && console.timeEnd("\u23F1\uFE0F");
			}
		} catch (s) {
			return (
				window.dispatchEvent(
					new CustomEvent("flamethrower:router:error", s)
				),
				this.opts.log && console.timeEnd("\u23F1\uFE0F"),
				console.error("\u{1F4A5} router fetch failed", s),
				!1
			);
		}
	}
}
const T = (o) => {
	const e = new q(o);
	if ((o.log && console.log("\u{1F525} flamethrower engaged"), window)) {
		const t = window;
		t.flamethrower = e;
	}
	return e;
};
export { T as default };