/*!
Main program for `pacdef`. All internal logic happens in [`pacdef_core`].
*/

#![warn(
    clippy::as_conversions,
    clippy::option_if_let_else,
    clippy::redundant_pub_crate,
    clippy::semicolon_if_nothing_returned,
    clippy::unused_self,
    clippy::unwrap_used,
    clippy::use_debug,
    clippy::use_self,
    clippy::wildcard_dependencies,
    missing_docs
)]

use std::process::{ExitCode, Termination};

use anyhow::{bail, Context, Result};

use pacdef_core::{get_args, get_config_path, get_group_dir, Config, Group, Pacdef};

fn main() -> ExitCode {
    handle_final_result(main_inner())
}

/// Skip printing the error chain when searching packages yields no results,
/// otherwise report error chain.
fn handle_final_result(result: Result<()>) -> ExitCode {
    match result {
        Ok(_) => ExitCode::SUCCESS,
        Err(ref e) => {
            let root_e = e.root_cause().downcast_ref();
            match root_e {
                Some(pacdef_core::Error::NoPackagesFound) => ExitCode::FAILURE,
                Some(_) => ExitCode::FAILURE,
                None => result.report(),
            }
        }
    }
}

fn main_inner() -> Result<()> {
    let args = get_args();

    let config_file = get_config_path().context("getting config file")?;
    let config = load_config(config_file)?;

    let group_dir = get_group_dir().context("resolving group dir")?;
    let groups = Group::load(&group_dir, config.warn_not_symlinks)
        .with_context(|| format!("loading groups under {}", group_dir.to_string_lossy()))?;

    let pacdef = Pacdef::new(args, config, groups);
    pacdef.run_action_from_arg().context("running action")
}

fn load_config(config_file: std::path::PathBuf) -> Result<Config> {
    let config = match Config::load(&config_file)
        .with_context(|| format!("loading config file {}", config_file.to_string_lossy()))
    {
        Ok(config) => config,
        Err(e) => {
            let e = e.root_cause().downcast_ref::<pacdef_core::Error>();
            match e {
                Some(pacdef_core::Error::ConfigFileNotFound) => Config::default(),
                _ => bail!("huh"),
            }
        }
    };
    Ok(config)
}