mod html;
mod rss;
mod static_files;
mod txt;

use crate::post::Post;
use crate::template::Context;
use std::io::Result;
use std::path::Path;

type Generator = fn(&Path, &Path, &Path, &Context) -> Result<()>;

pub fn generate(
    static_directory: &Path,
    template_directory: &Path,
    output_directory: &Path,
    posts: &[Post],
) -> Result<()> {
    let generators = available_generators();
    let context = Post::to_template_context(posts);
    for generator in generators {
        generator(
            static_directory,
            template_directory,
            output_directory,
            &context,
        )?;
    }
    Ok(())
}

fn available_generators() -> Vec<Generator> {
    vec![
        static_files::generate,
        // These three are actually the same. Can generalize, don't know how in rust yet.
        html::generate,
        rss::generate,
        txt::generate,
    ]
}