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

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

pub fn generate(
    _: &PathBuf,
    template_directory: &PathBuf,
    target: &PathBuf,
    context: &TemplateContext,
) -> Result<()> {
    match find(template_directory, FILENAME) {
        Some(template) => {
            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)?;
        }
        None => {}
    }
    Ok(())
}