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use log::{LevelFilter, Record, Log, Metadata, Level, SetLoggerError};
use colored::*;
use chrono::Local;
pub use log::{info, warn, error, debug, trace};

pub struct BasicLog {
  output_level: LevelFilter,
}

pub struct LoggerSettings {
  enable_debug: bool,
  enable_trace: bool,
}

impl LoggerSettings {
  pub fn new() -> Self {
    Self {
      enable_debug: false,
      enable_trace: false,
    }
  }

  pub fn enable_debug(mut self) -> Self {
    self.enable_debug = true;
    self
  }

  pub fn enable_trace(mut self) -> Self {
    self.enable_trace = true;
    self
  }
}

impl Default for LoggerSettings {
  fn default() -> Self {
    Self::new()
  }
}

impl BasicLog {
  fn set_settings(logger: &mut BasicLog, s: LoggerSettings) {
    logger.output_level = {
      if s.enable_trace {
        LevelFilter::Trace
      }
      else if s.enable_debug {
        LevelFilter::Debug
      } else {
        logger.output_level
      }
    };
  }

  #[must_use = "Must initialise logger: .init()"]
  pub fn new() -> Self {
    Self {
      output_level: LevelFilter::Info,
    }
  }

  #[must_use = "Must initialise logger: .init()"]
  pub fn new_with_settings<F>(s: F) -> Self
    where F: FnOnce(LoggerSettings) -> LoggerSettings {
      let mut logger = Self::default();
      Self::set_settings(&mut logger, s(LoggerSettings::default()));
      logger
  }

  pub fn new_with_struct(s: LoggerSettings) -> Self {
    let mut logger = Self::default();
    Self::set_settings(&mut logger, s);
    logger
  }
  
  pub fn init(self) -> Result<(), SetLoggerError> {
    log::set_max_level(self.output_level);
    log::set_boxed_logger(Box::new(self))?;
    Ok(())
  }
}

impl Default for BasicLog {
  fn default() -> Self {
    Self::new()
  }
}


impl Log for BasicLog {
  fn enabled(&self, metadata: &Metadata) -> bool {
    metadata.level().to_level_filter() <= self.output_level
  }

  fn log(&self, rec: &Record) {
    use Level::*;
    let log_type = match rec.level() {
      Error => "ERROR".bright_red(),
      Warn => "WARN".bright_yellow(),
      Info => "INFO".bright_blue(),
      Debug => "DEBUG".green(),
      Trace => "trace".bright_purple(),
    };

    let time = Local::now()
      .format("%d %B %Y %H:%M:%S,%3f");

    println!("{log_type:<5} | {time} - {msg}",
      log_type = log_type,
      time = time,
      msg = rec.args()
    )
  }

  fn flush(&self) {
      
  }
}

#[cfg(test)]
mod tests {
  use crate::BasicLog;
  use log::SetLoggerError;
  #[test]
  fn it_works() {
    assert_eq!(2 + 2, 4);
  }

  #[test]
  fn create_logger() -> Result<(), SetLoggerError> {
    BasicLog::new().init()?;
    Ok(())
  }

  #[test]
  fn set_settings() {
    use crate::LoggerSettings;
    let mut logger = BasicLog::new();
    let s = LoggerSettings::default().enable_debug();
    BasicLog::set_settings(&mut logger, s);
    assert_eq!(logger.output_level, log::LevelFilter::Debug);
  }
}