use std::error::Error;
use std::{panic, thread};

use backtrace::Backtrace;
use bevy::prelude::*;

pub fn error_handler(In(result): In<Result<(), Box<dyn Error>>>) {
    if let Err(e) = result {
        error!("{}", e);
    }
}

fn init_panic_handler() {
    panic::set_hook(Box::new(|info| {
        let backtrace = Backtrace::default();
        let thread = thread::current();
        let thread = thread.name().unwrap_or("<unnamed>");
        let msg = match info.payload().downcast_ref::<&'static str>() {
            Some(s) => *s,
            None => match info.payload().downcast_ref::<String>() {
                Some(s) => &**s,
                None => "Box<Any>",
            },
        };
        match info.location() {
            Some(location) => {
                error!(
                    target: "panic", "thread '{}' panicked at '{}': {}:{}{:?}",
                    thread,
                    msg,
                    location.file(),
                    location.line(),
                    backtrace
                );
            }
            None => error!(
                target: "panic",
                "thread '{}' panicked at '{}'{:?}",
                thread,
                msg,
                backtrace
            ),
        }
    }));
}

#[derive(Clone, Debug, Default)]
pub struct ErrorConfig {
    pub sentry_dsn: Option<String>,
    pub version: Option<String>,
}

pub struct ErrorPlugin;

impl Plugin for ErrorPlugin {
    fn build(&self, app: &mut App) {
        if !cfg!(debug_assertions) {
            init_panic_handler();
        }
        if let Some(config) = app.world.get_resource::<ErrorConfig>() {
            if let Some(dsn) = &config.sentry_dsn {
                let release = config.version.clone().unwrap_or_else(|| "".to_string());
                let guard = sentry::init((
                    dsn.as_str(),
                    sentry::ClientOptions {
                        release: Some(release.into()),
                        ..Default::default()
                    },
                ));
                app.insert_resource(guard);
            }
        }
    }
}