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extern crate proc_macro;
extern crate proc_macro2;
#[macro_use]
extern crate syn;
#[macro_use]
extern crate quote;

use proc_macro::TokenStream;
use syn::{
    parse::{Parse, ParseStream, Result},
    DeriveInput, ItemFn, ItemStruct, LitStr, Token,
};

mod utils;

#[proc_macro_attribute]
pub fn db_test(_metadata: TokenStream, input: TokenStream) -> TokenStream {
    let fn_item: ItemFn = parse_macro_input!(input as ItemFn);
    let fn_ident = fn_item.ident;
    let visibility = fn_item.vis;
    let _inputs = fn_item.decl.inputs;
    let output = fn_item.decl.output;
    let block = fn_item.block;
    (quote! {
        #[test]
        #visibility fn #fn_ident() #output {
            db_test(|conn|{
                #block
            })
        }
    })
    .into()
}

// realm_page macro stuff

#[derive(Debug)]
struct PathArgs {
    id: String,
}

mod keyword {
    syn::custom_keyword!(id);
}

impl Parse for PathArgs {
    fn parse(input: ParseStream) -> Result<Self> {
        input.parse::<keyword::id>()?;
        input.parse::<Token![=]>()?;
        let path: LitStr = input.parse()?;
        Ok(PathArgs { id: path.value() })
    }
}

#[proc_macro_attribute]
pub fn realm_page(meta: TokenStream, input: TokenStream) -> TokenStream {
    let id = parse_macro_input!(meta as PathArgs).id;

    let html_path = utils::convert_id_to_html_path(&id);
    // if id = "Pages.Foo.BarBaz", html_path should be "foo/bar-baz.html"
    // lower case, convert dot to slash, convert camel case to kabab case
    let input_clone = input.clone();
    let derive_input = parse_macro_input!(input_clone as DeriveInput);
    let struct_item: ItemStruct = parse_macro_input!(input as ItemStruct);
    let ident = struct_item.ident;

    let path = format!(
        "{}/templates/{}",
        std::env::var("CARGO_MANIFEST_DIR").unwrap_or_else(|_| ".".to_string()),
        html_path
    );
    let q = if std::path::Path::new(&path).is_file() {
        if std::env::var("DEBUG_REALM_PAGE").is_ok() {
            println!("realm_macros::debug: using {} for {}", path, id);
        }
        quote! {
            #[derive(Serialize, Template)]
            #[template(path = #path)]
            #derive_input

            impl realm::Page for #ident {
                const ID: &'static str = #id;
            }
        }
    } else {
        let source = format!("<!-- {} -->", html_path);
        if std::env::var("DEBUG_REALM_PAGE").is_ok() {
            println!("realm_macros::debug: {} not found for {}", path, id);
        }
        quote! {
            #[derive(Serialize, Template)]
            #[template(source = #source, ext = "txt")]
            #derive_input

            impl realm::Page for #ident {
                const ID: &'static str = #id;
            }
        }
    };

    q.into()
}