use proc_macro2::{Span, TokenStream};
use quote::quote;
use std::{collections::BTreeMap, fs};
use syn::LitInt;
pub(crate) fn build() -> TokenStream {
    println!("cargo:rerun-if-changed=../assets/flower_pot_transformations.json");

    let flower_pot_transformation: BTreeMap<u16, u16> = serde_json::from_str(
        &fs::read_to_string("../assets/flower_pot_transformations.json").unwrap(),
    )
    .expect("Failed to parse flower_pot_transformations.json");
    let match_arms: Vec<TokenStream> = flower_pot_transformation
        .into_iter()
        .map(|(item_id, potted_block_id)| {
            let item_id_lit = LitInt::new(&item_id.to_string(), Span::call_site());
            let potted_id_lit = LitInt::new(&potted_block_id.to_string(), Span::call_site());
            quote! {
                #item_id_lit => #potted_id_lit,
            }
        })
        .collect();
    quote! {
        #[must_use]
        pub const fn get_potted_item(item_id: u16) -> u16 {
            match item_id {
                #(#match_arms)*
                _ => 0,
            }
        }
    }
}