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use crate::utils::*;
use walrus::*;

pub fn shrink(m: &mut Module) {
    if is_motoko_canister(m) {
        let ids = get_motoko_wasm_data_sections(m);
        for (id, mut module) in ids.into_iter() {
            shrink(&mut module);
            let blob = encode_module_as_data_section(module);
            let original_len = m.data.get(id).value.len();
            if blob.len() < original_len {
                m.data.get_mut(id).value = blob;
            }
        }
    }
    let to_remove: Vec<_> = m
        .customs
        .iter()
        .filter(|(_, section)| !section.name().starts_with("icp:"))
        .map(|(id, _)| id)
        .collect();
    for s in to_remove {
        m.customs.delete(s);
    }
    passes::gc::run(m);
}