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

// https://github.com/pest-parser/pest/issues/490
#[allow(clippy::upper_case_acronyms)]

mod html_parser;
mod css_parser;

use proc_macro2::{Span, TokenStream as TokenStream2};
use proc_macro::TokenStream;
use syn::{ExprLit, Lit};

use crate::html_parser::HtmlParser;
use crate::css_parser::CssParser;

#[proc_macro]
#[proc_macro_error]
pub fn html(input: TokenStream) -> TokenStream {
    let call_site = Span::call_site();
    // emit_warning!(call_site, "HTML: input: {}", input.to_string());
    let result = HtmlParser::parse_stream(call_site, &input.to_string(), true);
    // emit_warning!(call_site, "HTML: output: {}", result);
    result.into()
}

#[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()
}

fn generate_css_string(input: TokenStream) -> (TokenStream2, bool) {
    let call_site = Span::call_site();
    CssParser::parse_stream(call_site, &get_string(input))
    // let result = CssParser::parse_stream(call_site, &get_string(input));
    // emit_warning!(call_site, "CSS: output: {}", result.0);
    // result
}

fn get_string(input: TokenStream) -> String {
    match syn::parse::<ExprLit>(input) {
        Ok(str_input) => match str_input.lit {
            Lit::Str(lit_str) => lit_str.value(),
            _ => panic!("Unsupported input type"),
        },
        Err(e) => panic!("Error parsing input: {}", e),
    }
}