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// Copyright 2016 Victor Brekenfeld
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.

//! Module providing the FileLogger Implementation

use log::{LogLevelFilter, LogMetadata, LogRecord, SetLoggerError, set_logger, Log};
use std::io::Write;
use std::sync::Mutex;
use ::{Config, SharedLogger};
use super::logging::try_log;

/// The WriteLogger struct. Provides a Logger implementation for structs implementing `Write`, e.g. File
pub struct WriteLogger<W: Write + Send + 'static> {
    level: LogLevelFilter,
    config: Config,
    writable: Mutex<W>,
}

impl<W: Write + Send + 'static> WriteLogger<W> {

    /// init function. Globally initializes the WriteLogger as the one and only used log facility.
    ///
    /// Takes the desired `LogLevel`, `Config` and `Write` struct as arguments. They cannot be changed later on.
    /// Fails if another Logger was already initialized.
    ///
    /// # Examples
    /// ```
    /// # extern crate simplelog;
    /// # use simplelog::*;
    /// # use std::fs::File;
    /// # fn main() {
    /// let _ = WriteLogger::init(LogLevelFilter::Info, Config::default(), File::create("my_rust_bin.log").unwrap());
    /// # }
    /// ```
    pub fn init(log_level: LogLevelFilter, config: Config, writable: W) -> Result<(), SetLoggerError> {
        set_logger(|max_log_level| {
            max_log_level.set(log_level.clone());
            WriteLogger::new(log_level, config, writable)
        })
    }

    /// allows to create a new logger, that can be independently used, no matter what is globally set.
    ///
    /// no macros are provided for this case and you probably
    /// dont want to use this function, but `init()``, if you dont want to build a `CombinedLogger`.
    ///
    /// Takes the desired `LogLevel`, `Config` and `Write` struct as arguments. They cannot be changed later on.
    ///
    /// # Examples
    /// ```
    /// # extern crate simplelog;
    /// # use simplelog::*;
    /// # use std::fs::File;
    /// # fn main() {
    /// let file_logger = WriteLogger::new(LogLevelFilter::Info, Config::default(), File::create("my_rust_bin.log").unwrap());
    /// # }
    /// ```
    pub fn new(log_level: LogLevelFilter, config: Config, writable: W) -> Box<WriteLogger<W>> {
        Box::new(WriteLogger { level: log_level, config: config, writable: Mutex::new(writable) })
    }

}

impl<W: Write + Send + 'static> Log for WriteLogger<W> {

    fn enabled(&self, metadata: &LogMetadata) -> bool {
        metadata.level() <= self.level
    }

    fn log(&self, record: &LogRecord) {
        if self.enabled(record.metadata()) {
            let mut write_lock = self.writable.lock().unwrap();
            let _ = try_log(&self.config, record, &mut *write_lock);
        }
    }
}

impl<W: Write + Send + 'static> SharedLogger for WriteLogger<W> {

    fn level(&self) -> LogLevelFilter {
        self.level
    }

    fn config(&self) -> Option<&Config>
    {
        Some(&self.config)
    }

    fn as_log(self: Box<Self>) -> Box<Log> {
        Box::new(*self)
    }

}