#[macro_export]
macro_rules! parser {
    ($input:expr) => {
        Parser::new(Tokenizer::from($input))
    };
}

mod blocks;
use super::Parser;
use super::Tokenizer;
use anyhow::Result;
use pretty_assertions::assert_eq;

#[test]
fn test_unsupported_keywords() -> Result<()> {
    let mut parser = parser!("enum x;");
    assert!(parser.parse().is_err());

    let mut parser = parser!("if x {}");
    assert!(parser.parse().is_err());

    let mut parser = parser!("else {}");
    assert!(parser.parse().is_err());

    Ok(())
}

#[test]
fn test_declarations() -> Result<()> {
    let input = r#"
        let x = 5;
        // The below line should fail
        let y = 234
        "#;
    let tokenizer = Tokenizer::from(input);
    let mut parser = Parser::new(tokenizer);

    let expression = parser.parse()?.unwrap();

    assert_eq!("(let x = 5)", expression.to_string());

    assert!(parser.parse().is_err());

    Ok(())
}

#[test]
fn test_const_declaration() -> Result<()> {
    let input = r#"
        const item = 20c;
        const decimal = 200.15;
        const nameConst = "str_lit";
    "#;
    let tokenizer = Tokenizer::from(input);
    let mut parser = Parser::new(tokenizer);

    assert_eq!(
        "(const item = 293.15)",
        parser.parse()?.unwrap().to_string()
    );

    assert_eq!(
        "(const decimal = 200.15)",
        parser.parse()?.unwrap().to_string()
    );

    assert_eq!(
        r#"(const nameConst = "str_lit")"#,
        parser.parse()?.unwrap().to_string()
    );

    assert_eq!(None, parser.parse()?);

    Ok(())
}

#[test]
fn test_function_expression() -> Result<()> {
    let input = r#"
            // This is a function. The parser is starting to get more complex
            fn add(x, y) {
                let z = x;
            }
        "#;

    let tokenizer = Tokenizer::from(input);
    let mut parser = Parser::new(tokenizer);

    let expression = parser.parse()?.unwrap();

    assert_eq!(
        "(fn add(x, y) { { (let z = x); } })",
        expression.to_string()
    );

    Ok(())
}

#[test]
fn test_function_invocation() -> Result<()> {
    let input = r#"
                add();
            "#;

    let tokenizer = Tokenizer::from(input);
    let mut parser = Parser::new(tokenizer);

    let expression = parser.parse()?.unwrap();

    assert_eq!("add()", expression.to_string());

    Ok(())
}

#[test]
fn test_priority_expression() -> Result<()> {
    let input = r#"
            let x = (4);
        "#;

    let tokenizer = Tokenizer::from(input);
    let mut parser = Parser::new(tokenizer);

    let expression = parser.parse()?.unwrap();

    assert_eq!("(let x = 4)", expression.to_string());

    Ok(())
}

#[test]
fn test_binary_expression() -> Result<()> {
    let expr = parser!("4 ** 2 + 5 ** 2;").parse()?.unwrap();
    assert_eq!("((4 ** 2) + (5 ** 2))", expr.to_string());

    let expr = parser!("2 ** 3 ** 4;").parse()?.unwrap();
    assert_eq!("(2 ** (3 ** 4))", expr.to_string());

    let expr = parser!("45 * 2 - 15 / 5 + 5 ** 2;").parse()?.unwrap();
    assert_eq!("(((45 * 2) - (15 / 5)) + (5 ** 2))", expr.to_string());

    let expr = parser!("(5 - 2) * 10;").parse()?.unwrap();
    assert_eq!("((5 - 2) * 10)", expr.to_string());

    Ok(())
}