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// Copyright 2024 MaidSafe.net limited.
//
// This SAFE Network Software is licensed to you under The General Public License (GPL), version 3.
// Unless required by applicable law or agreed to in writing, the SAFE Network Software distributed
// under the GPL Licence is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. Please review the Licences for the specific language governing
// permissions and limitations relating to use of the SAFE Network Software.

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

const VERSION_MESSAGE: &str = concat!(
    env!("CARGO_PKG_VERSION"),
    "-",
    env!("VERGEN_GIT_DESCRIBE"),
    " (",
    env!("VERGEN_BUILD_DATE"),
    ")"
);

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(())
}

pub fn get_launchpad_data_dir_path() -> Result<PathBuf> {
    let mut home_dirs = dirs_next::data_dir().expect("Data directory is obtainable");
    home_dirs.push("safe");
    home_dirs.push("launchpad");
    std::fs::create_dir_all(home_dirs.as_path())?;
    Ok(home_dirs)
}

pub fn get_config_dir() -> Result<PathBuf> {
    let config_dir = get_launchpad_data_dir_path()?.join("config");
    std::fs::create_dir_all(&config_dir)?;
    Ok(config_dir)
}

pub fn initialize_logging() -> Result<()> {
    let timestamp = chrono::Local::now().format("%Y-%m-%d_%H-%M-%S").to_string();
    let log_path = get_launchpad_data_dir_path()?
        .join("logs")
        .join(format!("log_{timestamp}"));
    std::fs::create_dir_all(&log_path)?;
    let log_file = std::fs::File::create(log_path.join("launchpad.log"))
        .context(format!("Failed to create file {log_path:?}"))?;
    std::env::set_var(
        "RUST_LOG",
        std::env::var("RUST_LOG")
            .unwrap_or_else(|_| format!("{}=trace,debug", 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(())
}

/// Similar to the `std::dbg!` macro, but generates `tracing` events rather
/// than printing to stdout.
///
/// By default, the verbosity level for the generated events is `DEBUG`, but
/// this can be customized.
#[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)
    };
}

pub fn version() -> String {
    let author = clap::crate_authors!();

    let data_dir_path = get_launchpad_data_dir_path().unwrap().display().to_string();

    format!(
        "\
{VERSION_MESSAGE}

Authors: {author}

Data directory: {data_dir_path}"
    )
}