napali 0.1.1

use color_eyre::eyre::Result;
use directories::ProjectDirs;
use lazy_static::lazy_static;
use std::path::PathBuf;
use tracing::error;
use tracing_error::ErrorLayer;
use tracing_subscriber::{
  self, prelude::__tracing_subscriber_SubscriberExt, util::SubscriberInitExt,
  Layer,
};

/// Static variable containing the current Git commit hash.
//pub static GIT_COMMIT_HASH: &str = env!("_GIT_INFO"); // FIX

lazy_static! {
    /// The project name, derived from the crate name and converted to uppercase.
    pub static ref PROJECT_NAME: String =
        env!("CARGO_CRATE_NAME").to_uppercase().to_string();
    /// Optional path to the data folder, configurable via environment variable.
    pub static ref DATA_FOLDER: Option<PathBuf> =
        std::env::var(format!("{}_DATA", PROJECT_NAME.clone()))
            .ok()
            .map(PathBuf::from);
    /// Optional path to the configuration folder, configurable via environment variable.
    pub static ref CONFIG_FOLDER: Option<PathBuf> =
        std::env::var(format!("{}_CONFIG", PROJECT_NAME.clone()))
            .ok()
            .map(PathBuf::from);
    /// Environment variable for setting the log level.
    pub static ref LOG_ENV: String = format!("{}_LOGLEVEL", PROJECT_NAME.clone());
    /// Filename for the log file.
    pub static ref LOG_FILE: String = format!("{}.log", env!("CARGO_PKG_NAME"));
}

/// Retrieves the project directory information.
///
/// # Returns
///
/// `Option<ProjectDirs>` - The project directories if available.
fn project_directory() -> Option<ProjectDirs> {
  ProjectDirs::from("com", "integrated-reasoning", env!("CARGO_PKG_NAME"))
}

/// Initializes the panic handler for the application.
///
/// Configures the panic and error handling using `color_eyre` and other utilities.
///
/// # Returns
///
/// `Result<()>` - Ok if the initialization is successful, or an error.
pub fn initialize_panic_handler() -> Result<()> {
  let (panic_hook, eyre_hook) = color_eyre::config::HookBuilder::default()
    .panic_section(format!(
      "This is a bug. Consider reporting it at {}",
      env!("CARGO_PKG_REPOSITORY")
    ))
    .capture_span_trace_by_default(false)
    .display_location_section(false)
    .display_env_section(false)
    .into_hooks();
  eyre_hook.install()?;
  std::panic::set_hook(Box::new(move |panic_info| {
    if let Ok(mut t) = crate::tui::Tui::new() {
      if let Err(r) = t.exit() {
        error!("Unable to exit Terminal: {:?}", r);
      }
    }

    #[cfg(not(debug_assertions))]
    {
      use human_panic::{handle_dump, print_msg, Metadata};
      let meta = Metadata {
        version: env!("CARGO_PKG_VERSION").into(),
        name: env!("CARGO_PKG_NAME").into(),
        authors: env!("CARGO_PKG_AUTHORS").replace(':', ", ").into(),
        homepage: env!("CARGO_PKG_HOMEPAGE").into(),
      };

      let file_path = handle_dump(&meta, panic_info);
      // prints human-panic message
      print_msg(file_path, &meta)
        .expect("human-panic: printing error message to console failed");
      eprintln!("{}", panic_hook.panic_report(panic_info)); // prints color-eyre stack trace to stderr
    }
    let msg = format!("{}", panic_hook.panic_report(panic_info));
    log::error!("Error: {}", strip_ansi_escapes::strip_str(msg));

    #[cfg(debug_assertions)]
    {
      // Better Panic stacktrace that is only enabled when debugging.
      better_panic::Settings::auto()
        .most_recent_first(false)
        .lineno_suffix(true)
        .verbosity(better_panic::Verbosity::Full)
        .create_panic_handler()(panic_info);
    }

    std::process::exit(libc::EXIT_FAILURE);
  }));
  Ok(())
}

/// Retrieves the path to the data directory.
///
/// # Returns
///
/// `PathBuf` - The path to the data directory.
pub fn get_data_dir() -> PathBuf {
  let directory = if let Some(s) = DATA_FOLDER.clone() {
    s
  } else if let Some(proj_dirs) = project_directory() {
    proj_dirs.data_local_dir().to_path_buf()
  } else {
    PathBuf::from(".").join(".data")
  };
  directory
}

/// Retrieves the path to the configuration directory.
///
/// # Returns
///
/// `PathBuf` - The path to the configuration directory.
pub fn get_config_dir() -> PathBuf {
  let directory = if let Some(s) = CONFIG_FOLDER.clone() {
    s
  } else if let Some(proj_dirs) = project_directory() {
    proj_dirs.config_local_dir().to_path_buf()
  } else {
    PathBuf::from(".").join(".config")
  };
  directory
}

/// Initializes the logging system for the application.
///
/// Configures and sets up file-based logging.
///
/// # Returns
///
/// `Result<()>` - Ok if the logging system is successfully initialized, or an error.
pub fn initialize_logging() -> Result<()> {
  let directory = get_data_dir();
  std::fs::create_dir_all(directory.clone())?;
  let log_path = directory.join(LOG_FILE.clone());
  let log_file = std::fs::File::create(log_path)?;
  std::env::set_var(
    "RUST_LOG",
    std::env::var("RUST_LOG")
      .or_else(|_| std::env::var(LOG_ENV.clone()))
      .unwrap_or_else(|_| format!("{}=info", env!("CARGO_CRATE_NAME"))),
  );
  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_default_env());
  tracing_subscriber::registry()
    .with(file_subscriber)
    .with(ErrorLayer::default())
    .init();
  Ok(())
}

/// Macro for generating `tracing` events.
///
/// Similar to `std::dbg!`, but for `tracing`. By default, the verbosity level is `DEBUG`.
///
/// # Usage
///
/// ```
/// trace_dbg!(expression);
/// trace_dbg!(target: "my_target", expression);
/// trace_dbg!(level: tracing::Level::INFO, expression);
/// ```
#[macro_export]
macro_rules! trace_dbg {
    (target: $target:expr, level: $level:expr, $ex:expr) => {{
        match $ex {
            value => {
                tracing::event!(target: $target, $level, ?value, stringify!($ex));
                value
            }
        }
    }};
    (level: $level:expr, $ex:expr) => {
        trace_dbg!(target: module_path!(), level: $level, $ex)
    };
    (target: $target:expr, $ex:expr) => {
        trace_dbg!(target: $target, level: tracing::Level::DEBUG, $ex)
    };
    ($ex:expr) => {
        trace_dbg!(level: tracing::Level::DEBUG, $ex)
    };
}

/// Generates version information for the application.
///
/// # Returns
///
/// `String` - The formatted version information string.
pub fn version() -> String {
  let author = clap::crate_authors!();

  //let commit_hash = GIT_COMMIT_HASH; // FIX
  let commit_hash = String::default();

  // let current_exe_path = PathBuf::from(clap::crate_name!()).display().to_string();
  let config_dir_path = get_config_dir().display().to_string();
  let data_dir_path = get_data_dir().display().to_string();

  format!(
    "\
{commit_hash}

Authors: {author}

Config directory: {config_dir_path}
Data directory: {data_dir_path}"
  )
}