mod rss;
mod input;
mod download;

use std::fs;

use anyhow::Context;

fn main() -> anyhow::Result<()> {

    let args = {
        use clap::Parser;
        input::Args::parse()
    };

    let config : input::Config = {
        let config = fs::read_to_string(&args.config)
            .context("failed to read in podcast configuration file")?;

        toml::from_str(&config[..])?
    };

    let config_path = args.config.canonicalize()?;
    let Some(root) = config_path.parent() else {
        anyhow::bail!("could not get parent of configuration path for root directory")
    };

    // Updating single podcast
    if let Some(alias) = args.podcast {
        if let Some(feed_url) = config.podcasts.get(&alias) {
            download::update_podcast(&alias, root, feed_url)?;
        }
        else {
            anyhow::bail!(r#"podcast "{}" not found in configuration file"#, alias)
        }
    }
    // Updating all podcasts
    else {
        for (alias, feed_url) in config.podcasts {
            download::update_podcast(&alias, root, &feed_url)?;
        }
    }

    Ok(())
}