use codegen::{form_context, from_statements};

use crate::{ast::TopLevelStatement, lexer::Token, token_stream::TokenStream};

mod ast;
mod codegen;
mod lexer;
// mod llvm_ir;
mod token_stream;

// TODO:
// 1. Make it so that TopLevelStatement can only be import or function def
// 2. Make BlockLevelStatement, that has everything TopLevelStatement has now
// 3. Make it so all codegen is done with a Block-struct, that represents a
//    single proper block

#[derive(thiserror::Error, Debug)]
pub enum ReidError {
    #[error(transparent)]
    LexerError(#[from] lexer::Error),
    #[error(transparent)]
    ParserError(#[from] token_stream::Error),
    // #[error(transparent)]
    // CodegenError(#[from] codegen::Error),
}

pub fn compile(source: &str) -> Result<String, ReidError> {
    let tokens = lexer::tokenize(source)?;

    dbg!(&tokens);

    let mut token_stream = TokenStream::from(&tokens);

    let mut statements = Vec::new();

    while !matches!(token_stream.peek().unwrap_or(Token::Eof), Token::Eof) {
        let statement = token_stream.parse::<TopLevelStatement>()?;
        dbg!(&statement);
        statements.push(statement);
    }

    let mut context = form_context();
    let mut module = from_statements(&mut context, statements).unwrap();
    let text = module.print_to_string().unwrap();
    Ok(text.to_owned())
}