//! The INI files the AWS tools keep (`~/.aws/credentials`, `~/.aws/config`):

//! `[section]` headings and `key = value` lines, nothing more.

use std::collections::BTreeMap;

pub type Sections = BTreeMap<String, BTreeMap<String, String>>;

pub fn parse(text: &str) -> Sections {

    let mut out = Sections::new();

    let mut current: Option<String> = None;

    for raw in text.lines() {

        let line = raw.trim();

        if line.is_empty() || line.starts_with('#') || line.starts_with(';') {

            continue;

        }

        if let Some(name) = line.strip_prefix('[').and_then(|l| l.strip_suffix(']')) {

            current = Some(name.trim().to_string());

            out.entry(name.trim().to_string()).or_default();

            continue;

        }

        if let (Some(section), Some((k, v))) = (&current, line.split_once('=')) {

            out.entry(section.clone())

                .or_default()

                .insert(k.trim().to_string(), v.trim().to_string());

        }

    }

    out

}

#[cfg(test)]

mod tests {

    use super::parse;

    #[test]

    fn sections_and_keys() {

        let s = parse("[default]\nregion = eu-west-2\n\n# a comment\n[profile work]\nregion=us-east-1\nsso_start_url = https://x\n");

        assert_eq!(s["default"]["region"], "eu-west-2");

        assert_eq!(s["profile work"]["region"], "us-east-1");

        assert_eq!(s["profile work"]["sso_start_url"], "https://x");

        assert!(parse("").is_empty());

    }

}