mod cli;

use std::pin::pin;

use clap::{CommandFactory, Parser};
use clap_complete::{Shell, generate as generate_complete};
use crete::cluster::Cluster;
use crete::environment::PathEnvironment;
use crete::talosconfig::{get_current_context, set_context};
use crete::{get_configs_path, get_repo_path, set_repo_path};
use futures::StreamExt;
use futures::future::join_all;
use minijinja::context;
use thiserror::Error;

use crate::cli::{Cli, Commands, GlobalOpts};

#[derive(Debug, Error)]
enum Error {
    #[error("No clusters where found")]
    NoClustersFound,
}

async fn generate(opts: &GlobalOpts) -> Result<(), Error> {
    set_repo_path(&opts.repo);

    let clusters = Cluster::get_all().await;

    if clusters.is_empty() {
        return Err(Error::NoClustersFound);
    }

    let path = opts.repo.join("rendered");
    // We don't really care if this fails, as that likely mean that the directory did not exist
    tokio::fs::remove_dir_all(&path).await.ok();
    tokio::fs::create_dir_all(&path).await.unwrap();

    // Render templates
    let template_env = PathEnvironment::new(&get_repo_path().join("templates"));

    let mut stream = pin!(template_env.files());
    while let Some(template_name) = stream.next().await {
        let template = template_env.get_template(&template_name).unwrap();

        let content = template
            .render(context! {
                clusters,
                root => opts.repo
            })
            .unwrap();

        tokio::fs::write(path.join(template_name), content)
            .await
            .unwrap();
    }

    let context = get_current_context().await;

    // Remove existing config files and create output directory
    let path = get_configs_path();
    tokio::fs::remove_dir_all(&path).await.ok();
    tokio::fs::create_dir_all(&path).await.unwrap();

    // Generate config files
    join_all(clusters.iter().map(|cluster| async move {
        join_all(cluster.nodes().iter().map(|node| {
            let cluster = cluster.clone();
            async move {
                node.config_write(&cluster).await;
            }
        }))
        .await;

        // Run these commands in parallel with the the node commands
        // NOTE: These do need to happen in the correct order
        cluster.talosconfig_write().await;
    }))
    .await;

    // Merge all the cluster talosconfig files into a single file
    // Since this all modifies the same output file this has to happen sequentially
    for cluster in clusters {
        cluster.talosconfig_merge().await;
    }

    if let Some(context) = context {
        set_context(context).await;
    }

    Ok(())
}

#[tokio::main]
async fn main() -> Result<(), Error> {
    let cli = Cli::parse();

    match cli.command {
        Commands::Generate => generate(&cli.global_opts).await?,
        Commands::ShellCompletions => generate_complete(
            Shell::from_env().unwrap_or(Shell::Bash),
            &mut Cli::command(),
            "crete",
            &mut std::io::stdout(),
        ),
    };

    Ok(())
}