mod rss;
mod sync;
mod input;
mod manage;
mod folders;
mod playlist;
mod download;

use input::{Command, ListenStatus};

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")
    };

    match args.command {
        Command::Download { podcast } => {
            // Updating single podcast
            if let Some(alias) = podcast {
                if let Some(source) = config.podcasts.get(&alias) {
                    download::update_podcast(&alias, root, source)?;
                }
                else {
                    anyhow::bail!(r#"podcast "{}" not found in configuration file"#, alias)
                }
            }
            // Updating all podcasts
            else {
                for (alias, source) in config.podcasts {
                    download::update_podcast(&alias, root, &source)?;
                }
            }
        }
        Command::List { status, podcast } => {
            let output = folders::podcast_folder(root, &podcast);
            let spec_file = output.join(folders::SPEC_FILE);

            let spec = manage::Specification::read_from(&spec_file)?;

            for (_, episodes) in spec.feed_iter() {
                for episode in episodes {
                    if status.is_none()
                    || (episode.listened && status.is_some_and(|x| x == ListenStatus::Listened))
                    || (!episode.listened && status.is_some_and(|x| x == ListenStatus::Unlistened)) {
                        println!("{}", episode.title())
                    }
                }
            }
        }
        Command::Mark { status, podcast } => {
            let output = folders::podcast_folder(root, &podcast);
            let spec_file = output.join(folders::SPEC_FILE);

            let mut spec = manage::Specification::read_from(&spec_file)?;

            for (_, episodes) in spec.feed_iter_mut() {
                for episode in episodes {
                    episode.listened = status == ListenStatus::Listened;
                }
            }

            spec.write_to(&spec_file)?;
        }
        Command::Playlist { podcast } => {
            if let Some(alias) = podcast {
                playlist::generate_podcast_m3u(alias.as_str(), root, false)?;
                playlist::generate_podcast_m3u(alias.as_str(), root, true)?;
            } else {
                for (alias, _) in &config.podcasts {
                    playlist::generate_podcast_m3u(alias.as_str(), root, true)?;
                    playlist::generate_podcast_m3u(alias.as_str(), root, false)?;
                }
                playlist::generate_master_m3u(&config, root)?;
            }
        }
        Command::Sync { ipod_dir, download } => {
            // Sync listened podcasts
            sync::sync_listened(
                root,
                &ipod_dir.join(folders::LOCAL_PLAYLISTS_DIR).join(folders::LISTENED_PLAYLIST_PATH),
                true,
            )?;

            if download {
                // Download all new episodes
                for (alias, source) in &config.podcasts {
                    download::update_podcast(&alias, root, &source)?;
                }
            }

            // Generate updated playlist files
            for (alias, _) in &config.podcasts {
                playlist::generate_podcast_m3u(alias.as_str(), root, true)?;
                playlist::generate_podcast_m3u(alias.as_str(), root, false)?;
            }
            playlist::generate_master_m3u(&config, root)?;

            // Sync podcasts and playlists
            sync::sync(root, &config, &ipod_dir)?;
        }
    };

    Ok(())
}