//! 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());
    }
}