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use proc_macro2::Span;
use syn::{DeriveInput, Meta, NestedMeta, Ident};
use crate::debug;
use crate::changes::*;

fn storage(ast: &DeriveInput, name: &Ident, ty_generics: &syn::TypeGenerics) -> proc_macro2::TokenStream{
    let storage = ast.attrs.iter()
        .filter_map(|attr| attr.parse_meta().ok().and_then(|meta| match meta {
            Meta::List(ref list) if list.path.is_ident("storage") => Some(list.clone()),
            _ => None,
        }))
        .next()
        .and_then(|list| list.nested.first().and_then(|attr| match attr {
            NestedMeta::Meta(item) => Some(item.clone()),
            _ => None,
        }))
        .and_then(|attr| match attr {
            Meta::Path(path) => Some(path.segments.first().unwrap().ident.clone()),
            _ => None,
        })
        .unwrap_or(Ident::new("DenseVec", Span::call_site()));

    let crate_name = match super::rinecs_crate_name(){
        Ok(crate_name) => crate_name,
        Err(err) => return err.to_compile_error(),
    };

    let storage = quote!(#crate_name::storage::#storage<#name #ty_generics>);

    if changes(ast){
        quote!(#crate_name::storage::Changed<#storage, #name #ty_generics>)
    }else if autochanges(ast) {
        quote!(#crate_name::storage::AutoChanged<#storage, #name #ty_generics>)
    }else{
        storage
    }
}

pub fn references_other(is_reference: bool, crate_name: &syn::Path) -> proc_macro2::TokenStream {
    if is_reference {
        quote!{
            fn references_other() -> Option<Box<dyn Fn(&#crate_name::storage::Storages, &#crate_name::Entity) -> #crate_name::Entity>>{
                use #crate_name::Storage;
                use std::borrow::Borrow;
                use std::ops::Deref;
                Some(Box::new(|storages, entity| {
                    let storage = storages.storage::<Self>().unwrap();
                    unsafe{ *Storage::get(&*storage, entity.guid()).borrow().deref() }
                }))
            }
        }
    }else{
        quote!()
    }
}


fn impl_single_tuple_struct(ast: &DeriveInput, is_reference: bool) -> proc_macro2::TokenStream {
    let name = &ast.ident;
    let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();

    let storage = storage(ast, name, &ty_generics);
    let crate_name = match super::rinecs_crate_name(){
        Ok(crate_name) => crate_name,
        Err(err) => return err.to_compile_error(),
    };

    let references_other = references_other(is_reference, &crate_name);

    if let syn::Data::Struct(struct_data) = &ast.data{
        let field = struct_data.fields.iter().next().unwrap();
        let field_ty = &field.ty;
        let param_tokens = debug::impl_debug_parameter(ast);
        let cache_guard = if is_reference {
            quote!(#crate_name::CacheGuard)
        }else{
            quote!(())
        };

        let component_tokens = quote! {
            impl #impl_generics #crate_name::Component for #name #ty_generics #where_clause {
                type Storage = #storage;
                type MutStorageCacheGuard = #cache_guard;

                fn type_name() -> &'static str{
                    concat!(module_path!(), "::", stringify!(#name #ty_generics))
                }

                fn is_reference() -> bool {
                    #is_reference
                }

                #references_other
            }

            impl #impl_generics ::std::ops::Deref for #name #ty_generics #where_clause {
                type Target = #field_ty;
                fn deref(&self) -> &#field_ty{
                    &self.0
                }
            }

            impl #impl_generics ::std::ops::DerefMut for #name #ty_generics #where_clause {
                fn deref_mut(&mut self) -> &mut #field_ty{
                    &mut self.0
                }
            }
        };
        param_tokens.into_iter().chain(component_tokens.into_iter()).collect()
    }else{
        unreachable!()
    }
}

fn impl_other_structs(ast: &DeriveInput, is_reference: bool) -> proc_macro2::TokenStream {
    let name = &ast.ident;
    let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();

    let storage = storage(ast, name, &ty_generics);
    let param_tokens = debug::impl_debug_parameter(ast);
    let crate_name = match super::rinecs_crate_name(){
        Ok(crate_name) => crate_name,
        Err(err) => return err.to_compile_error(),
    };
    let cache_guard = if is_reference {
        quote!(#crate_name::CacheGuard)
    }else{
        quote!(())
    };

    let references_other = references_other(is_reference, &crate_name);

    let component_tokens = quote! {
        impl #impl_generics #crate_name::Component for #name #ty_generics #where_clause {
            type Storage = #storage;
            type MutStorageCacheGuard = #cache_guard;

            fn type_name() -> &'static str{
                concat!(module_path!(), "::", stringify!(#name), stringify!(#ty_generics))
            }

            fn is_reference() -> bool {
                #is_reference
            }

            #references_other
        }
    };

    param_tokens.into_iter().chain(component_tokens.into_iter()).collect()
}

pub fn impl_ntoone_component(ast: &DeriveInput) -> proc_macro2::TokenStream {
    let name = &ast.ident;
    let (_, ty_generics, _) = ast.generics.split_for_impl();
    let mut generics = ast.generics.clone();
    generics.params.push(parse_quote!('c));
    let (impl_generics, _, where_clause) = generics.split_for_impl();
    let crate_name = match super::rinecs_crate_name(){
        Ok(crate_name) => crate_name,
        Err(err) => return err.to_compile_error(),
    };

    quote! {
        impl #impl_generics #crate_name::NToOneComponent<'c> for #name #ty_generics #where_clause {
        }
        impl #impl_generics #crate_name::ReferenceType for #name #ty_generics #where_clause {
            type ReferenceType = #crate_name::operators::RefData;
        }
    }
}

pub fn impl_component(ast: &DeriveInput, is_reference: bool) -> proc_macro2::TokenStream {
    match &ast.data {
		syn::Data::Struct(struct_data) => {
            match &struct_data.fields {
        		syn::Fields::Unnamed(_) => {
                    let fields = struct_data.fields.iter().collect::<Vec<_>>();
                    if fields.len() == 1{
                        return impl_single_tuple_struct(ast, is_reference);
                    }
                }
    		    _ => ()
            }
        }
        _ => ()
	}
    impl_other_structs(ast, is_reference)
}

pub fn impl_tag(ast: &DeriveInput) -> proc_macro2::TokenStream {
    let name = &ast.ident;
    let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
    let crate_name = match super::rinecs_crate_name(){
        Ok(crate_name) => crate_name,
        Err(err) => return err.to_compile_error(),
    };

    quote! {
        impl #impl_generics #crate_name::Component for #name #ty_generics #where_clause {
            type Storage = #crate_name::storage::Tags<#name #ty_generics>;
            type MutStorageCacheGuard = ();
            fn type_name() -> &'static str{
                concat!(module_path!(), "::", stringify!(#name), stringify!(#ty_generics))
            }

            fn is_reference() -> bool { false }
        }
    }
}