#[derive(Debug, Clone)]
pub struct KabelError {
    pub kind: ErrorKind,
    pub message: String,
    pub hint: Option<String>,
    pub line: usize,
    pub column: usize,
    pub code: String,
}

impl KabelError {
    pub fn new(kind: ErrorKind, message: String, hint: Option<String>, line: usize, column: usize, code: String) -> Self {
        Self {
            kind,
            message,
            hint,
            line,
            column,
            code,
        }
    }
}

impl std::fmt::Display for KabelError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let caret_space: String = vec![' '; self.column].iter().collect();
        f.write_str(&format!(
            "Error {:0>4}: {1} at line {2}, column {3}\n\
                    {4}\n\
                    {5}^",
            self.kind.clone() as usize,
            self.message,
            self.line + 1,
            self.column + 1,
            self.code,
            caret_space
        ))?;
        if let Some(ref hint) = self.hint {
            f.write_str(&format!("\n{0}{1}", caret_space, hint))?;
        }
        Ok(())
    }
}

impl std::error::Error for KabelError {}

#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ErrorKind {
    UnexpectedEof,
    UnexpectedCharacter,
    UnexpectedToken,
    MissingDelimiter,
    OutOfScope,
    VariableAlreadyDeclaredVariable,
    VariableAlreadyDeclaredFunction,
    FunctionAlreadyDeclaredVariable,
    FunctionAlreadyDeclaredFunction,
    IncorrectArity,
}

impl std::fmt::Display for ErrorKind {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        use ErrorKind::*;
        match self {
            UnexpectedEof => f.write_str("Unexpected End of File"),
            UnexpectedCharacter => f.write_str("Unrecognized Charcter"),
            UnexpectedToken => f.write_str("Unrecognized Token"),
            MissingDelimiter => f.write_str("Missing delimiter"),
            OutOfScope => f.write_str("Out of scope"),
            VariableAlreadyDeclaredVariable => f.write_str("Variable already declared variable"),
            VariableAlreadyDeclaredFunction => f.write_str("Variable already declared function"),
            FunctionAlreadyDeclaredVariable => f.write_str("Function already declared variable"),
            FunctionAlreadyDeclaredFunction => f.write_str("Function already declared function"),
            IncorrectArity => f.write_str("Incorrect arity"),
        }
    }
}

impl From<ErrorKind> for usize {
    fn from(value: ErrorKind) -> Self {
        use ErrorKind::*;
        match value {
            UnexpectedEof => 0x00,
            UnexpectedCharacter => 0x01,
            UnexpectedToken => 0x02,
            MissingDelimiter => 0x03,
            OutOfScope => 0x04,
            VariableAlreadyDeclaredVariable => 0x05,
            VariableAlreadyDeclaredFunction => 0x06,
            FunctionAlreadyDeclaredVariable => 0x07,
            FunctionAlreadyDeclaredFunction => 0x08,
            IncorrectArity => 0x09,
        }
    }
}