agent-source-repository 0.1.0

use std::path::{Component, Path, PathBuf};

pub(crate) fn path_lookup_candidates(file_path: &str) -> Vec<String> {
    let path = Path::new(file_path);
    let mut candidates = Vec::new();

    candidates.push(file_path.replace('\\', "/"));
    candidates.push(normalize_path_to_slash(path));

    if let Ok(stripped) = path.strip_prefix(".") {
        candidates.push(normalize_path_to_slash(stripped));
    }

    candidates.sort();
    candidates.dedup();
    candidates
}

pub(crate) fn normalize_path_to_slash(path: &Path) -> String {
    let mut normalized = PathBuf::new();

    for component in path.components() {
        match component {
            Component::CurDir => {}
            Component::ParentDir => {
                normalized.pop();
            }
            Component::Normal(part) => normalized.push(part),
            Component::RootDir | Component::Prefix(_) => {}
        }
    }

    normalized.to_string_lossy().replace('\\', "/")
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn path_candidates_accept_plain_and_leading_dot_paths() {
        assert_eq!(
            path_lookup_candidates("./src/main.rs"),
            vec!["./src/main.rs".to_string(), "src/main.rs".to_string()]
        );
    }

    #[test]
    fn normalized_path_collapses_current_and_parent_components() {
        assert_eq!(
            normalize_path_to_slash(Path::new("./src/bin/../main.rs")),
            "src/main.rs"
        );
    }
}