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#[macro_use]
extern crate pest_derive;
#[macro_use]
extern crate proc_macro_error;

mod css_parser;
mod serde_request;
mod html_parser;
mod bind;

use html_parser::dom_inner;
use proc_macro::TokenStream;
use proc_macro2::{TokenStream as TokenStream2, Span};

use crate::{
    css_parser::generate_css_string,
};
use bind::{bind_macro_fn, bind_spawn_fn, bind_rc_fn};

#[proc_macro]
#[proc_macro_error]
pub fn dom(input: TokenStream) -> TokenStream {
    dom_inner(input)
}

#[proc_macro]
#[proc_macro_error]
pub fn dom_debug(input: TokenStream) -> TokenStream {
    let stream = dom_inner(input);
    emit_warning!("debug: {:?}", stream);
    stream
}

#[proc_macro]
#[proc_macro_error]
pub fn css_block(input: TokenStream) -> TokenStream {
    let (css_str, _) = generate_css_string(input);
    let result = quote! { #css_str };
    result.into()
}

#[proc_macro]
#[proc_macro_error]
pub fn css(input: TokenStream) -> TokenStream {
    let (css_str, is_dynamic) = generate_css_string(input);
    let result = if is_dynamic {
        quote! { vertigo::Css::string(#css_str) }
    } else {
        quote! { vertigo::Css::str(#css_str) }
    };
    result.into()
}

#[proc_macro_derive(SerdeSingleRequest)]
#[proc_macro_error]
pub fn serde_single_request_macro_derive(input: TokenStream) -> TokenStream {
    let ast = syn::parse(input).unwrap();
    serde_request::impl_single_request_trait_macro(&ast)
}

#[proc_macro_derive(SerdeListRequest)]
#[proc_macro_error]
pub fn serde_list_request_macro_derive(input: TokenStream) -> TokenStream {
    let ast = syn::parse(input).unwrap();
    serde_request::impl_list_request_trait_macro(&ast)
}

#[proc_macro_derive(SerdeRequest)]
#[proc_macro_error]
pub fn serde_request_macro_derive(input: TokenStream) -> TokenStream {
    let ast = syn::parse(input).unwrap();
    let single: TokenStream2 = serde_request::impl_single_request_trait_macro(&ast).into();
    let list: TokenStream2 = serde_request::impl_list_request_trait_macro(&ast).into();
    let result = quote! {
        #single
        #list
    };
    result.into()
}

fn convert_to_tokens(input: Result<TokenStream, String>) -> TokenStream {
    match input {
        Ok(body) => {
            body
        },
        Err(message) => {
            emit_error!(Span::call_site(), "{}", message);
            let empty = "";
            quote! { #empty }.into()
        }
    }
}

#[proc_macro]
#[proc_macro_error]
pub fn bind(input: TokenStream) -> TokenStream {
    convert_to_tokens(bind_macro_fn(input))
}

#[proc_macro]
#[proc_macro_error]
pub fn bind_spawn(input: TokenStream) -> TokenStream {
    convert_to_tokens(bind_spawn_fn(input))
}

#[proc_macro]
#[proc_macro_error]
pub fn bind_rc(input: TokenStream) -> TokenStream {
    convert_to_tokens(bind_rc_fn(input))
}