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use crate::Token;
use crate::TokenType;
use crate::Extras;

use logos::{Logos};
use std::convert::TryFrom;
use std::ops::Range;
use text_size::{TextRange, TextSize};

#[derive(Clone)]
pub struct Lexer<'l> {
    inner: logos::Lexer<'l, TokenType>,
}

impl<'l> Lexer<'l> {
    pub fn new(source: &'l str) -> Self {
        Self {
            inner: TokenType::lexer_with_extras(source, Extras {
                line: 1
            }),
        }
    }

    pub fn extras(&self) -> Extras {
        self.inner.extras.clone()
    }

    pub fn peek(&mut self) -> Option<Token> {
        let mut clone = self.clone();

        clone.next()
    }
}

impl<'l> Iterator for Lexer<'l> {
    type Item = Token<'l>;

    fn next(&mut self) -> Option<Self::Item> {
        let kind = self.inner.next()?;
        let slice = self.inner.slice();

        let range = {
            let Range { start, end } = self.inner.span();

            TextRange::new(
                TextSize::try_from(start).unwrap(),
                TextSize::try_from(end).unwrap(),
            )
        };

        Some(Self::Item { kind, slice, range })
    }
}