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use crate::types::TimeZone;
use crate::{ErrorKind, Result};
use slog::{Logger, Record};
use slog_scope;
use slog_stdlog;
use slog_term;
use std::io;
use std::path::Path;
use trackable::error::ErrorKindExt;

/// Sets the logger for the log records emitted via `log` crate.
pub fn set_stdlog_logger(logger: Logger) -> Result<()> {
    let _guard = slog_scope::set_global_logger(logger);
    track!(slog_stdlog::init().map_err(|e| ErrorKind::Other.cause(e).into()))
}

pub fn module_and_line(record: &Record) -> String {
    format!("{}:{}", record.module(), record.line())
}

pub fn file_and_line(record: &Record) -> String {
    format!("{}:{}", record.file(), record.line())
}

pub fn local_file_and_line(record: &Record) -> String {
    if Path::new(record.file()).is_relative() {
        file_and_line(record)
    } else {
        module_and_line(record)
    }
}

pub fn timezone_to_timestamp_fn(timezone: TimeZone) -> fn(&mut dyn io::Write) -> io::Result<()> {
    match timezone {
        TimeZone::Utc => slog_term::timestamp_utc,
        TimeZone::Local => slog_term::timestamp_local,
    }
}