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use std::sync::Once;

extern crate pretty_env_logger;

static INIT_LOGGER_ONCE: Once = Once::new();

#[cfg(not(target_os = "android"))]
macro_rules! colored_log {
    ($buf:ident, $record:ident, $tag:ident, $term_color:literal, $level:literal) => {{
        let filename = $record.file().unwrap_or("unknown");
        let filename = &filename[filename.rfind('/').map(|pos| pos + 1).unwrap_or(0)..];
        writeln!(
            $buf,
            concat!($term_color, "{} [{}] [{}:{}] [", $level, "] {}\x1B[0m"),
            chrono::Local::now().format("%Y-%m-%d %H:%M:%S.%3f"),
            $tag,
            filename,
            $record.line().unwrap_or(0),
            $record.args()
        )
    }};
}

pub struct LogHelper;
impl LogHelper {
    pub fn init_logger(tag: &'static str, log_level: &str) {
        INIT_LOGGER_ONCE.call_once(|| LogHelper::do_init_logger(tag, log_level));
    }

    #[cfg(not(target_os = "android"))]
    fn do_init_logger(tag: &'static str, log_level_str: &str) {
        use std::io::Write;
        let log_level_filter;
        match log_level_str.as_ref() {
            "D" => log_level_filter = log::LevelFilter::Debug,
            "I" => log_level_filter = log::LevelFilter::Info,
            "W" => log_level_filter = log::LevelFilter::Warn,
            "E" => log_level_filter = log::LevelFilter::Error,
            _ => log_level_filter = log::LevelFilter::Trace,
        }

        pretty_env_logger::formatted_timed_builder()
            .format(move |buf, record| match record.level() {
                log::Level::Trace => colored_log!(buf, record, tag, "\x1B[0m", "T"),
                log::Level::Debug => colored_log!(buf, record, tag, "\x1B[92m", "D"),
                log::Level::Info => colored_log!(buf, record, tag, "\x1B[34m", "I"),
                log::Level::Warn => colored_log!(buf, record, tag, "\x1B[93m", "W"),
                log::Level::Error => colored_log!(buf, record, tag, "\x1B[31m", "E"),
            })
            .filter(None, log_level_filter)
            .init();
    }

    #[cfg(target_os = "android")]
    fn do_init_logger(tag: &str, log_level_str: &str) {
        let log_level;
        match log_level_str.as_ref() {
            "D" => log_level = log::Level::Debug,
            "I" => log_level = log::Level::Info,
            "W" => log_level = log::Level::Warn,
            "E" => log_level = log::Level::Error,
            _ => log_level = log::Level::Trace,
        }

        android_logger::init_once(
            android_logger::Config::default()
                .with_min_level(log_level)
                .with_tag("rs-ffmpeg"),
        );
    }
}

pub struct Utils;

impl Utils {
    pub fn to_u32_be(array: &[u8; 4]) -> u32 {
        ((array[0] as u32) << 24)
            + ((array[1] as u32) << 16)
            + ((array[2] as u32) << 8)
            + ((array[3] as u32) << 0)
    }

    pub fn to_u32_le(array: &[u8; 4]) -> u32 {
        ((array[0] as u32) << 0)
            + ((array[1] as u32) << 8)
            + ((array[2] as u32) << 16)
            + ((array[3] as u32) << 24)
    }
}

#[cfg(test)]
mod tests {
    use crate::{LogHelper, Utils};

    #[test]
    fn it_works() {
        LogHelper::init_logger("Test", "T");
        log::trace!("test trace");
        log::debug!("test debug");
        log::info!("test info");
        log::warn!("test warn");
        log::error!("test error");

        let n1 = Utils::to_u32_be(&[0, 0, 0, 1]);
        let n2 = Utils::to_u32_le(&[0, 0, 0, 1]);
        log::info!("n_be:{}, n_le:{}", n1, n2);
    }
}