use crate::template::{find, parse, Context};
use std::fs::write;
use std::io::{Error, ErrorKind::Other, Result};
use std::path::Path;

const FILENAME: &str = "index.html";

pub fn generate(
    _: &Path,
    template_directory: &Path,
    target: &Path,
    context: &Context,
) -> Result<()> {
    if let Some(template) = find(template_directory, FILENAME) {
        let parsed_template =
            parse(&template).ok_or_else(|| Error::new(Other, "Unable to parse HTML template"))?;
        let rendered_template = parsed_template.render(context)?;
        let location = target.join(FILENAME);
        write(location, rendered_template)?;
    }
    Ok(())
}