use humansize::{FormatSizeOptions, BINARY};
use log::debug;
use regex::Regex;
use std::collections::HashMap;
use std::env;

pub fn get_meta_from_env() -> HashMap<String, String> {
    debug!("MAIN: Getting meta from KEEP_META_*");
    let re = Regex::new(r"^KEEP_META_(.+)$").unwrap();
    let mut meta_env: HashMap<String, String> = HashMap::new();
    for (key, value) in env::vars() {
        if let Some(meta_name_caps) = re.captures(key.as_str()) {
            let name = String::from(meta_name_caps.get(1).unwrap().as_str());
            debug!("MAIN: Found meta: {}={}", name.clone(), value.clone());
            meta_env.insert(name, value.clone());
        }
    }
    meta_env
}

pub fn format_size_human_readable(size: u64) -> String {
    let options = FormatSizeOptions::from(BINARY).decimal_places(1);
    humansize::format_size(size, options)
}

pub fn format_size(size: u64, human_readable: bool) -> String {
    match human_readable {
        true => format_size_human_readable(size),
        false => size.to_string(),
    }
}

pub fn string_column(s: String, column_width: usize) -> String {
    if column_width > 0 {
        match s.char_indices().nth(column_width) {
            None => s.to_string(),
            Some((idx, _)) => s[..idx].to_string(),
        }
    } else {
        s.to_string()
    }
}

pub fn size_column(size: u64, human_readable: bool, column_width: usize) -> String {
    string_column(format_size(size, human_readable), column_width)
}

pub const FORMAT_BOX_CHARS_NO_BORDER_LINE_SEPARATOR: prettytable::format::TableFormat =
    prettytable::format::FormatBuilder::new()
        .column_separator('│')
        .borders('│')
        .separators(
            &[prettytable::format::LinePosition::Top],
            prettytable::format::LineSeparator::new('─', '┬', '┌', '┐')
        )
        .separators(
            &[prettytable::format::LinePosition::Title],
            prettytable::format::LineSeparator::new('─', '┼', '├', '┤')
        )
        .separators(
            &[prettytable::format::LinePosition::Bottom],
            prettytable::format::LineSeparator::new('─', '┴', '└', '┘')
        )
        .padding(1, 1)
        .build();
}