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//! # log
//!
//! Initializes the global logger.
//!

#[cfg(test)]
#[path = "./logger_test.rs"]
mod logger_test;

use colored::*;
use fern;
use log::{Level, LevelFilter};
use std::env;
use std::io::stdout;

#[cfg(test)]
fn exit(code: i32) {
    panic!(code);
}

#[cfg(not(test))]
use std::process::exit;

#[derive(Debug, PartialEq)]
/// The log levels
pub(crate) enum LogLevel {
    VERBOSE,
    INFO,
    ERROR,
}

/// The logger options used to initialize the logger
pub(crate) struct LoggerOptions {
    /// The logger level name (verbose, info, error)
    pub(crate) level: String,
    /// True to printout colorful output
    pub(crate) color: bool,
}

pub(crate) fn get_level(level_name: &str) -> LogLevel {
    let mut level = LogLevel::INFO;

    if level_name == "verbose" {
        level = LogLevel::VERBOSE;
    } else if level_name == "error" {
        level = LogLevel::ERROR;
    }

    level
}

/// Returns the current logger level name
pub(crate) fn get_log_level() -> String {
    let level = if log_enabled!(Level::Debug) {
        "verbose"
    } else if log_enabled!(Level::Info) {
        "info"
    } else {
        "error"
    };

    level.to_string()
}

fn get_name_for_filter(filter: &LevelFilter) -> String {
    let level = match filter {
        LevelFilter::Debug => Level::Debug,
        LevelFilter::Warn => Level::Warn,
        LevelFilter::Error => Level::Error,
        _ => Level::Info,
    };

    get_name_for_level(&level)
}

fn get_name_for_level(level: &Level) -> String {
    match level {
        Level::Debug => "verbose".to_string(),
        Level::Warn => "warn".to_string(),
        Level::Error => "error".to_string(),
        _ => "info".to_string(),
    }
}

fn get_formatted_name(name: &str, use_color: bool) -> ColoredString {
    if use_color {
        name.bold()
    } else {
        name.normal()
    }
}

fn get_formatted_log_level(level: &Level, use_color: bool) -> ColoredString {
    let mut level_name = get_name_for_level(&level);
    level_name = level_name.to_uppercase();

    if use_color {
        let fmt_value = match level {
            Level::Debug => level_name.cyan(),
            Level::Info => level_name.green(),
            Level::Warn => level_name.yellow(),
            Level::Error => level_name.red(),
            _ => level_name.normal(),
        };

        fmt_value.bold()
    } else {
        level_name.normal()
    }
}

/// Initializes the global logger.
///
/// # Arguments
///
/// * `level_name` - The log level name ('verbose', 'info', 'error')
pub(crate) fn init(options: &LoggerOptions) {
    let level_name = &options.level;
    let color = options.color;

    let level = get_level(level_name);

    let log_level = match level {
        LogLevel::VERBOSE => LevelFilter::Debug,
        LogLevel::INFO => LevelFilter::Info,
        LogLevel::ERROR => LevelFilter::Error,
    };
    let level_name_value = get_name_for_filter(&log_level);

    env::set_var("CARGO_MAKE_LOG_LEVEL", &level_name_value);

    let result = fern::Dispatch::new()
        .format(move |out, message, record| {
            let name = env!("CARGO_PKG_NAME");
            let record_level = record.level();

            let name_fmt = get_formatted_name(&name, color);

            let record_level_fmt = get_formatted_log_level(&record_level, color);

            out.finish(format_args!(
                "[{}] {} - {}",
                &name_fmt, &record_level_fmt, &message
            ));

            if record_level == Level::Error {
                warn!("Build Failed.");

                exit(1);
            }
        })
        .level(log_level)
        .chain(stdout())
        .apply();

    if result.is_err() {
        println!("Unable to setup logger.");
    }
}