#![allow(static_mut_refs)]

use embassy_sync::blocking_mutex::{raw::CriticalSectionRawMutex, Mutex};
use esp_hal::time::Instant;
use esp_println::println;
use log::{LevelFilter, Metadata, Record};

// Provides a threadsafe serial logger
pub struct RenderbugLogger {
    lock: Mutex<CriticalSectionRawMutex, ()>,
    current_level: LevelFilter,
    default_level: LevelFilter
}

impl Default for RenderbugLogger {
    fn default() -> Self {
        Self {
            lock: Mutex::new(()),
            current_level: LevelFilter::Info,
            default_level: LevelFilter::Info
        }
    }
}

static mut LOGGER: Option<RenderbugLogger> = None;

impl RenderbugLogger {
    pub fn init_logger() {
        #[cfg(feature = "rtt")]
        rtt_target::rtt_init_print!(rtt_target::ChannelMode::BlockIfFull);

        let default_level = match option_env!("LOG_LEVEL").unwrap_or("info").to_lowercase().as_str() {
            "debug" => LevelFilter::Debug,
            "warn" => LevelFilter::Warn,
            "trace" => LevelFilter::Trace,
            "error" => LevelFilter::Error,
            _ => LevelFilter::Info
        };

        unsafe { LOGGER.replace(RenderbugLogger { default_level, current_level: default_level, ..Default::default() }) };
        let logger = unsafe { LOGGER.as_mut().unwrap() };
        unsafe {
            critical_section::with(|_| {
                log::set_logger_racy(logger).ok();
                log::set_max_level_racy(default_level);
            });
        };
    }

    pub fn set_level(level: LevelFilter) {
        unsafe {
            critical_section::with(|_| {
                log::set_max_level_racy(level);
                LOGGER.as_mut().unwrap().current_level = level;
            })
        }
    }

    pub fn reset_level() {
        unsafe {
            critical_section::with(|_| {
                let logger = LOGGER.as_mut().unwrap();
                log::set_max_level_racy(logger.default_level);
                logger.current_level = logger.default_level;
            })
        }
    }
}

impl log::Log for RenderbugLogger {
    fn enabled(&self, metadata: &Metadata) -> bool {
        metadata.level() >= self.default_level
    }

    fn flush(&self) {}

    fn log(&self, record: &Record) {
        const RESET: &str = "\u{001B}[0m";
        const RED: &str = "\u{001B}[31m";
        const GREEN: &str = "\u{001B}[32m";
        const YELLOW: &str = "\u{001B}[33m";
        const BLUE: &str = "\u{001B}[34m";
        const CYAN: &str = "\u{001B}[35m";
        const GREY: &str = "\u{001B}[38;5;240m";

        let color = match record.level() {
            log::Level::Error => RED,
            log::Level::Warn => YELLOW,
            log::Level::Info => GREEN,
            log::Level::Debug => BLUE,
            log::Level::Trace => CYAN,
        };

        let filename = record.file().map_or("???", |f| {f});
        let crate_name = record.module_path_static().unwrap();
        let timestamp = Instant::now().duration_since_epoch().as_micros();
        for enabled in option_env!("LOG_CRATES").unwrap_or("").split(",") {
            if crate_name.starts_with(enabled) {
                self.lock.lock(|_| {
                    #[cfg(feature = "rtt")]
                    rtt_target::rprintln!("{}{}\t{}{}:{}{}\t{}{}", color, record.level(), GREY, filename, record.line().map_or(0, |f| {f}), RESET, record.args(), RESET);
                    
                    println!("{color}{}\t{GREY}{timestamp}\t{} {filename}:{}{RESET}\t{}{RESET}", record.level(), record.module_path_static().unwrap(), record.line().map_or(0, |f| {f}), record.args());
                });
                return;
            }
        }
    }
}