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use std::sync::RwLock;
use std::env;
use std::fs::OpenOptions;
use std::io::Write;

use log::{self, LogRecord, LogLevel, LogLevelFilter, LogMetadata, SetLoggerError};
use time;

struct ScreenLogger;

impl log::Log for ScreenLogger {
    fn enabled(&self, metadata: &LogMetadata) -> bool {
        metadata.level() <= LogLevel::Info
    }

    fn log(&self, record: &LogRecord) {
        if self.enabled(record.metadata()) {
            let line = format!("{} - {}", record.level(), record.args());
            let mut logs = LOGS.write().unwrap();
            logs.insert(0, line);
            logs.truncate(5);
        }
        let line = format!("{} {} {}:{}] {}\n",
                           time::get_time().sec,
                           record.level(),
                           record.location().file().split("/").last().unwrap(),
                           record.location().line(),
                           record.args());

        if let Ok(path) = env::var("LOGFILE") {
            let mut f = OpenOptions::new()
                .append(true)
                .create(true)
                .open(path)
                .unwrap();
            f.write_all(line.as_bytes()).unwrap();
        }
    }
}

pub fn init_screen_log() -> Result<(), SetLoggerError> {
    log::set_logger(|max_log_level| {
        max_log_level.set(LogLevelFilter::Debug);
        Box::new(ScreenLogger)
    })
}

pub fn read_logs() -> Vec<String> {
    LOGS.read().unwrap().clone()
}

lazy_static! {
    static ref LOGS: RwLock<Vec<String>> = RwLock::new(vec![]);
}