use handlebars::Handlebars;
use std::path::Path;

const TEMPLATES_DIR: &'static str = "templates";
static TEMPLATE_FILES: &'static [(&str, &str)] =
	&[("index.html", include_str!("../templates/index.html"))];

pub struct Templates<'reg> {
	pub hb: Handlebars<'reg>,
}

pub fn load_templates<'reg>(dir: &Path) -> Templates<'reg> {
	let dir = dir.join(TEMPLATES_DIR);
	std::fs::create_dir_all(&dir).expect("Cannot create templates dir");

	for &(file, default) in TEMPLATE_FILES {
		let file_path = dir.join(file);
		if !file_path.is_file() {
			std::fs::write(file_path, default)
				.expect(&format!("Cannot write template file {}", file));
		}
	}

	let mut hb = Handlebars::new();
	for &(file, _) in TEMPLATE_FILES {
		hb.register_template_string(
			file,
			std::str::from_utf8(
				&std::fs::read(dir.join(file))
					.expect(&format!("Cannot read template file`{}`", file)),
			)
			.expect(&format!("Bad encoding in template file `{}`", file)),
		)
		.unwrap();
	}
	Templates { hb }
}