use std::fmt;

#[derive(Debug, Clone, PartialEq)]
pub enum Token {
    // Keywords
    Int,
    Double,
    String,
    Bool,
    Void,
    If,
    Else,
    For,
    While,
    Return,
    Input,
    
    // Built-in MQL5 Types
    MqlTick,
    MqlRates,
    
    // Identifiers & Literals
    Identifier(String),
    IntLiteral(i64),
    DoubleLiteral(f64),
    StringLiteral(String),
    BoolLiteral(bool),
    
    // Operators
    Plus,       // +
    Minus,      // -
    Star,       // *
    Slash,      // /
    Assign,     // =
    Equals,     // ==
    NotEquals,  // !=
    Greater,    // >
    Less,       // <
    GreaterEq,  // >=
    LessEq,     // <=
    And,        // &&
    Or,         // ||
    Not,        // !
    
    // Punctuation
    OpenParen,  // (
    CloseParen, // )
    OpenBrace,  // {
    CloseBrace, // }
    OpenBracket,// [
    CloseBracket,//]
    Comma,      // ,
    Semicolon,  // ;
    Dot,        // .
    
    // EOF
    Eof,
}

impl fmt::Display for Token {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{:?}", self)
    }
}