use std::fmt::Write;

use camino::Utf8Path;
use chrono::{DateTime, Utc};
use hauchiwa::{Bibliography, Outline, Sack};
use hayagriva::Library;
use hypertext::{html_elements, maud, GlobalAttributes, Raw, Renderable};
use serde::Deserialize;

const CSS: &str = r#"
.slides img {
	margin-left: auto;
	margin-right: auto;
	max-height: 60vh;
}
"#;

/// Represents a slideshow
#[derive(Deserialize, Debug, Clone)]
pub(crate) struct Slideshow {
	pub title: String,
	#[serde(with = "super::isodate")]
	pub date: DateTime<Utc>,
	pub desc: Option<String>,
}

pub fn parse_content(
	content: &str,
	sack: &Sack,
	path: &Utf8Path,
	library: Option<&Library>,
) -> (String, Outline, Bibliography) {
	let parsed = content
		.split("\n-----\n")
		.map(|chunk| {
			chunk
				.split("\n---\n")
				.map(|slide| crate::text::md::parse(slide, sack, path, library).0)
				.collect::<Vec<_>>()
		})
		.map(|stack| match stack.len() > 1 {
			true => {
				let mut buffer = String::from("<section>");

				for slide in stack {
					write!(buffer, "<section>{}</section>", slide).unwrap();
				}

				buffer
			}
			false => format!("<section>{}</section>", stack[0]),
		})
		.collect::<String>();
	(parsed, Outline(vec![]), Bibliography(None))
}

pub fn as_html(
	slides: &Slideshow,
	parsed: &str,
	sack: &Sack,
	_: Outline,
	_: Bibliography,
) -> String {
	show(slides, sack, parsed)
}

pub fn show(fm: &Slideshow, sack: &Sack, slides: &str) -> String {
	crate::html::bare(
		sack,
		maud!(
			div .reveal {
				div .slides {
					(Raw(slides))
				}
			}

			style { (Raw(CSS)) }
		),
		fm.title.clone(),
		Some(&["reveal".into()]),
	)
	.unwrap()
	.render()
	.into()
}