mod grid_index;
mod hash;
mod interned_column;
mod llm;

pub use grid_index::GridIndex;
pub use hash::{generate_priorities, splitmix64_hash};
pub use interned_column::InternedColumn;
pub use llm::{extract_gemini_content, gemini_chat};

/// Normalize a UK postcode: uppercase, strip spaces, insert canonical space before inward code.
/// e.g. "e142dg" → "E14 2DG", "E14  2DG" → "E14 2DG", "EC1A1BB" → "EC1A 1BB"
pub fn normalize_postcode(raw: &str) -> String {
    let stripped: String = raw.chars().filter(|c| !c.is_whitespace()).collect();
    let upper = stripped.to_uppercase();
    if upper.len() >= 5 {
        let (outward, inward) = upper.split_at(upper.len() - 3);
        format!("{} {}", outward, inward)
    } else {
        upper
    }
}