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extern crate proc_macro2;

use convert_case::{Case, Casing};
use quote::quote;
use syn::{parse_macro_input, Fields};

#[proc_macro_attribute]
pub fn event(
    _args: proc_macro::TokenStream,
    input: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
    let mut event_enum = parse_macro_input!(input as syn::ItemEnum);
    let event_name = &event_enum.ident;

    if event_enum.generics.params.len() > 0 {
        panic!("HPL Events does not allow generics");
    }

    let mut func_stream = proc_macro2::TokenStream::default();
    event_enum.variants.iter_mut().for_each(|variant| {
        let name = &variant.ident;
        let formated_name = name
            .to_string()
            .to_case(Case::Snake)
            .parse::<proc_macro2::TokenStream>()
            .unwrap();
        let mut new_variant: syn::Variant = syn::parse(proc_macro::TokenStream::from({
            quote! {
                #name {
                    timestamp: i64
                    // name: u8
                }
            }
        }))
        .unwrap();
        let mut func_args_stream = proc_macro2::TokenStream::default();
        let mut func_fields_stream = proc_macro2::TokenStream::default();
        if let Fields::Named(fileds) = &mut variant.fields {
            if let Fields::Named(new_fields) = &mut new_variant.fields {
                fileds.named.iter().for_each(|f| {
                    if let Some(field_name) = &f.ident {
                        // if let () = f.ty {}
                        let ty = &f.ty;
                        func_args_stream.extend::<proc_macro2::TokenStream>(quote! {
                            #field_name: #ty,
                        });
                        func_fields_stream.extend::<proc_macro2::TokenStream>(quote! {
                            #field_name,
                        });
                    }
                    new_fields.named.push(f.clone())
                });
            }
        }
        variant.fields = new_variant.fields;
        func_stream.extend::<proc_macro2::TokenStream>(quote! {
            pub fn #formated_name(#func_args_stream clock: &Clock) -> Self {
                #event_name::#name {
                    #func_fields_stream
                    timestamp: clock.unix_timestamp
                }
            }
        });
    });

    proc_macro::TokenStream::from({
        quote! {
            #[derive(borsh::BorshSerialize, borsh::BorshDeserialize)]
            #event_enum

            #[automatically_derived]
            impl #event_name {

                pub fn to_instruction(&self, wrapper_program_id: Pubkey) -> Instruction {
                    Instruction {
                        program_id: wrapper_program_id,
                        accounts: vec![],
                        data: vec![
                            crate::id().try_to_vec().unwrap(),
                            self.try_to_vec().unwrap(),
                        ]
                        .concat(),
                    }
                }

                pub fn emit_to<'info>(&self, wrapper_program: AccountInfo<'info>) -> ProgramResult {
                    invoke(
                        &self.to_instruction(wrapper_program.key()),
                        &[wrapper_program],
                    )
                }

                pub fn emit<'info>(&self, hpl_events_program: AccountInfo<'info>) -> ProgramResult {
                    if String::from("EventNxhSA3AcXD14PmXaYUiNQWwoKbLeGHtwydixRzX")
                        != hpl_events_program.key.to_string()
                    {
                        return Err(ProgramError::IncorrectProgramId);
                    };
                    self.emit_to(hpl_events_program)
                }

                #func_stream

            }
        }
    })
}