mod errors;
pub mod feed;
pub mod fetch;
pub mod file;
pub mod history;
pub mod network;
pub mod prelude;

#[cfg(test)]
mod test_utils;

use feed::FeedEnv;
use fetch::FetchEnv;
use file::FileEnv;
use history::HistoryEnv;
use network::NetworkEnv;
use prelude::*;

pub struct Env {
    pub feed: FeedEnv,
    pub network: NetworkEnv,
    pub history: HistoryEnv,
    pub fetch: FetchEnv,
    pub file: FileEnv,
}

pub fn run(subscriptions: &str, history: &str, site: &str, e: Env) -> Result<()> {
    for channel_name in file::read::lines_from(subscriptions, &e.file)? {
        println!("Channel: {}", channel_name);
        let feed_url = (e.feed.find)(site, &channel_name, &e.network)?;
        for entry in (e.feed.get)(&feed_url)?.entries() {
            if let Some(link) = entry.links().get(0).cloned() {
                if !(e.history.find)(&link, history, &e.file)? {
                    println!("Downloading {}: {}", &channel_name, entry.title().as_str());
                    (e.fetch.download)(&link)?;
                    (e.history.add)(&link, history)?;
                }
            }
        }
    }
    Ok(())
}