use anyhow::{Result, anyhow};
use camino::Utf8PathBuf;
use directories::ProjectDirs;
use tracing_subscriber::Layer;
use tracing_subscriber::layer::SubscriberExt;
use tracing_subscriber::util::SubscriberInitExt;

const APP_NAME: &str = "ptcg-tools";

/// Sets up logging for the application. Since the mode we will need logging for is a TUI, we can't
/// print our logs into stdout, so we will log into a file instead.
pub async fn initialize_logging() -> Result<()> {
    let user_directory = ProjectDirs::from("cl", "bstr", APP_NAME)
        .ok_or_else(|| anyhow!("failed to get ProjectDirs"))?
        .data_dir()
        .to_path_buf();
    let user_directory = Utf8PathBuf::try_from(user_directory)?;
    tokio::fs::create_dir_all(&user_directory).await?;
    let log_path = user_directory.join(format!("{APP_NAME}.log"));
    let log_file = std::fs::File::create(log_path)?;
    let file_subscriber = tracing_subscriber::fmt::layer()
        .with_file(true)
        .with_line_number(true)
        .with_writer(log_file)
        .with_target(false)
        .with_ansi(false)
        .with_filter(tracing_subscriber::filter::EnvFilter::from(format!(
            "{APP_NAME}=debug"
        )));
    tracing_subscriber::registry().with(file_subscriber).init();
    Ok(())
}