use chrono::TimeDelta;
use maud::{Markup, PreEscaped, html};
use page::{
	RenderContext,
	servable::{Page, PageMetadata, PageTemplate},
};

use crate::components::{
	fa::FAIcon,
	md::{Markdown, meta_from_markdown},
	misc::FarLink,
};

mod handouts;
mod index;
mod notfound;

pub use handouts::handouts;
pub use index::index;
pub use notfound::notfound;

pub fn links() -> Page {
	/*
	Dead links:

	https://www.commitstrip.com/en/
	http://www.3dprintmath.com/
	*/

	page_from_markdown(
		include_str!("links.md"),
		Some("/assets/img/icon.png".to_owned()),
	)
}

pub fn betalupi() -> Page {
	page_from_markdown(
		include_str!("betalupi.md"),
		Some("/assets/img/icon.png".to_owned()),
	)
}

pub fn htwah_typesetting() -> Page {
	page_from_markdown(
		include_str!("htwah-typesetting.md"),
		Some("/assets/img/icon.png".to_owned()),
	)
}

//
// MARK: md
//

fn page_from_markdown(md: impl Into<String>, default_image: Option<String>) -> Page {
	let md: String = md.into();
	let md = Markdown::parse(&md);

	let mut meta = meta_from_markdown(&md)
		.unwrap_or(Some(PageMetadata {
			title: "Invalid frontmatter!".into(),
			..Default::default()
		}))
		.unwrap_or_default();

	if meta.image.is_none() {
		meta.image = default_image
	}

	let html = PreEscaped(md.render());

	MAIN_TEMPLATE
		.derive(meta, move |_page, ctx| {
			let html = html.clone();

			Box::pin(async move {
				html! {
					div class="wrapper" style="margin-top:3ex;" {
						@if let Some(backlinks) = backlinks(ctx) {
							(backlinks)
						}

						(html)

						(footer())
					}
				}
			})
		})
		.html_ttl(Some(TimeDelta::days(1)))
		.immutable(true)
}

//
// MARK: components
//

const MAIN_TEMPLATE: PageTemplate = PageTemplate {
	// Order matters, base htmx goes first
	scripts_linked: &["/assets/htmx.js", "/assets/htmx-json.js"],

	// TODO: use htmx for this
	scripts_inline: &["
		window.onload = function() {
			var imgs = document.querySelectorAll('.img-placeholder');

			imgs.forEach(img => {
				img.style.border = 'none';
				img.style.filter = 'blur(10px)';
				img.style.transition = 'filter 0.3s';

				var lg = new Image();
				lg.src = img.dataset.large;
				lg.onload = function () {
					img.src = img.dataset.large;
					img.style.filter = 'blur(0px)';
				};
			})
		}
	"],

	styles_inline: &[],
	styles_linked: &["/assets/css/main.css"],

	extra_meta: &[(
		"viewport",
		"width=device-width,initial-scale=1,user-scalable=no",
	)],

	..PageTemplate::const_default()
};

pub fn backlinks(ctx: &RenderContext) -> Option<Markup> {
	let mut backlinks = vec![("/", "home")];

	let mut segments = ctx.route.split("/").skip(1).collect::<Vec<_>>();
	let last = segments.pop();

	let mut end = 0;
	for s in segments {
		end += s.len();
		backlinks.push((&ctx.route[0..=end], s));
		end += 1; // trailing slash
	}

	last.map(|last| {
		html! {
			div {
				@for (url, text) in backlinks {
					a href=(url) style="padding-left:5pt;padding-right:5pt;" { (text) }
					"/"
				}

				span style="color:var(--metaColor);padding-left:5pt;padding-right:5pt;" { (last) }
			}
		}
	})
}

pub fn footer() -> Markup {
	html!(
		footer style="margin-top:10rem;" {
			hr class = "footline";
			div class = "footContainer" {
				p {
					"This site was built by hand with "
					(FarLink("https://rust-lang.org", "Rust"))
					", "
					(FarLink("https://maud.lambda.xyz", "Maud"))
					", and "
					(FarLink("https://docs.rs/axum/latest/axum", "Axum"))
					". "

					(
						FarLink(
							"https://git.betalupi.com/Mark/webpage",
							html!(
								(FAIcon::Git)
								"Source here!"
							)
						)
					)
				}
			}
		}
	)
}