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use std::fmt::Write;
use std::time::Duration;

pub fn format_micros(micros: i32, f: &mut dyn std::fmt::Write) -> std::fmt::Result {
    return if micros < 1_000 {
        write!(f, "{} us", micros)
    } else if micros < 10_000 {
        write!(f, "{:.2} ms", micros as f32 / 1_000.)
    } else if micros < 100_000 {
        write!(f, "{:.1} ms", micros as f32 / 1_000.)
    } else if micros < 1_000_000 {
        write!(f, "{} ms", micros / 1_000)
    } else if micros < 10_000_000 {
        write!(f, "{:.2} s", micros as f32 / 1_000_000.)
    } else if micros < 100_000_000 {
        write!(f, "{:.1} s", micros as f32 / 1_000_000.)
    } else {
        write!(f, "{} s", micros / 1_000_000)
    };
}

pub fn format_short_duration(duration_in_micros: i32) -> String {
    let mut result = String::new();
    let _ = format_micros(duration_in_micros, &mut result);
    return result;
}

pub fn format_bytes(size_in_bytes: usize, f: &mut dyn std::fmt::Write) -> std::fmt::Result {
    if size_in_bytes == 1 {
        return write!(f, "1 byte");
    } else if size_in_bytes < 1024 {
        return write!(f, "{} bytes", size_in_bytes);
    }

    let mut magnitude = 0;
    let mut size = size_in_bytes as f32;
    while size > 1024. && magnitude < 5 {
        size /= 1024.;
        magnitude += 1;
    }

    if size <= 10. {
        write!(f, "{:2} ", size)?;
    } else if size <= 100. {
        write!(f, "{:1} ", size)?;
    } else {
        write!(f, "{:0} ", size)?;
    }

    match magnitude {
        0 => write!(f, "Bytes"),
        1 => write!(f, "KiB"),
        2 => write!(f, "MiB"),
        3 => write!(f, "GiB"),
        4 => write!(f, "TiB"),
        _ => write!(f, "PiB"),
    }
}

pub fn format_size(size_in_bytes: usize) -> String {
    let mut result = String::new();
    let _ = format_bytes(size_in_bytes, &mut result);
    return result;
}

pub fn parse_size(str: impl AsRef<str>) -> anyhow::Result<usize> {
    lazy_static::lazy_static! {
        static ref NUMBER_AND_SUFFIX: regex::Regex =
            regex::Regex::new(r"^ *(\d+) *([kKmMgGtT]?).*").unwrap();
    }

    match NUMBER_AND_SUFFIX.captures(str.as_ref()) {
        Some(captures) => {
            let number = captures[1].parse::<usize>().unwrap();
            match &captures[2] {
                "k" | "K" => Ok(number * 1024),
                "m" | "M" => Ok(number * 1024* 1024),
                "g" | "G" => Ok(number * 1024* 1024* 1024),
                "t" | "T" => Ok(number * 1024* 1024* 1024* 1024),
                _ => Ok(number)
            }
        }
        None => Err(anyhow::anyhow!("Cannot parse '{}' into a size expression. Only 'k', 'm', 'g' and 't' are accepted as suffixes.", str.as_ref()))
    }
}

pub fn parse_duration(str: impl AsRef<str>) -> anyhow::Result<Duration> {
    lazy_static::lazy_static! {
        static ref NUMBER_AND_SUFFIX: regex::Regex =
            regex::Regex::new(r"^ *(\d+) *((ms|s|m|h|d|MS|S|M|H|D)?).*").unwrap();
    }

    match NUMBER_AND_SUFFIX.captures(str.as_ref()) {
        Some(captures) => {
            let number = captures[1].parse::<u64>().unwrap();
            match &captures[2] {
                "s" | "S" => Ok(Duration::from_secs(number)),
                "m" | "M" => Ok(Duration::from_secs(number * 60)),
                "h" | "H" => Ok(Duration::from_secs(number * 60 * 60)),
                "d" | "D" => Ok(Duration::from_secs(number * 60 * 60 * 24)),
                _ => Ok(Duration::from_millis(number))
            }
        }
        None => Err(anyhow::anyhow!("Cannot parse '{}' into a duration expression. Only 'ms', 's', 'm', 'h' and 'd' are accepted as suffixes.", str.as_ref()))
    }
}

pub fn format_duration(duration: Duration) -> String {
    let mut result = String::new();

    let mut value = duration.as_millis();
    {
        let days = value / (1000 * 60 * 60 * 24);
        if days > 0 {
            let _ = write!(result, "{}d", days);
            value = value % (1000 * 60 * 60 * 24);
        }
    }
    {
        let hours = value / (1000 * 60 * 60);
        if hours > 0 {
            if !result.is_empty() {
                result.push(' ');
            }
            let _ = write!(result, "{}h", hours);
            value = value % (1000 * 60 * 60);
        }
    }
    {
        let minutes = value / (1000 * 60);
        if minutes > 0 {
            if !result.is_empty() {
                result.push(' ');
            }
            let _ = write!(result, "{}m", minutes);
            value = value % (1000 * 60);
        }
    }
    {
        let seconds = value / 1000;
        if seconds > 0 {
            if !result.is_empty() {
                result.push(' ');
            }
            let _ = write!(result, "{}s", seconds);
            value = value % 1000 * 60;
        }
    }
    if value > 0 {
        if !result.is_empty() {
            result.push(' ');
        }
        let _ = write!(result, "{}ms", value);
    }

    result
}