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use clap::Parser;
use figment::{
    providers::{Env, Format, Serialized, Toml},
    Figment,
};
use std::{error::Error, fs::File, sync::Arc};
use tmuxr::{Cli, Config, Finder, Paths, Result};
use tracing::info;
use tracing_subscriber::prelude::*;

fn main() -> Result<()> {
    let cli = Cli::parse();

    let config = Figment::from(Serialized::defaults(Config::default()))
        .merge(Serialized::defaults(&cli))
        .merge(Toml::file("tmuxr.toml"))
        .merge(Env::prefixed("TMUXR_"))
        .extract()
        .map_err(eprintln)?;

    init_subscriber(&cli, &config).map_err(eprintln)?;
    run(&config).map_err(eprintln)
}

fn eprintln<E: Error>(err: E) -> E {
    eprintln!("{}", err);
    err
}

fn init_subscriber(cli: &Cli, config: &Config) -> Result<()> {
    let stdout_layer = tracing_subscriber::fmt::layer()
        .pretty()
        .with_filter(cli.verbose.as_filter());

    let log_layer = if config.log_enabled {
        let file = File::create(&config.log_file)?;
        let log_layer = tracing_subscriber::fmt::layer().with_writer(Arc::new(file));
        Some(log_layer)
    } else {
        None
    };

    tracing_subscriber::registry()
        .with(stdout_layer)
        .with(log_layer)
        .init();

    Ok(())
}

#[tracing::instrument()]
pub fn run(config: &Config) -> Result<()> {
    let paths = Paths::from_provider(config)?;
    let selected = Finder::from_provider(config)?.spawn()?.find(paths)?;

    info!("{:?}", selected);

    Ok(())
}