use std::fmt::Write;
use std::io;
use tree_sitter_highlight::PropertySheetError;

#[derive(Debug)]
pub struct Error(pub Vec<String>);

pub type Result<T> = std::result::Result<T, Error>;

impl Error {
    pub fn grammar(message: &str) -> Self {
        Error(vec![format!("Grammar error: {}", message)])
    }

    pub fn regex(message: &str) -> Self {
        Error(vec![format!("Regex error: {}", message)])
    }

    pub fn undefined_symbol(name: &str) -> Self {
        Error(vec![format!("Undefined symbol `{}`", name)])
    }

    pub fn new(message: String) -> Self {
        Error(vec![message])
    }

    pub fn err<T>(message: String) -> Result<T> {
        Err(Error::new(message))
    }

    pub fn wrap<E: Into<Self>, M: ToString, F: FnOnce() -> M>(
        message_fn: F,
    ) -> impl FnOnce(E) -> Self {
        |e| {
            let mut result = e.into();
            result.0.push(message_fn().to_string());
            result
        }
    }

    pub fn message(&self) -> String {
        let mut result = self.0.last().unwrap().clone();
        if self.0.len() > 1 {
            result.push_str("\nDetails:\n");
            for msg in self.0[0..self.0.len() - 1].iter().rev() {
                writeln!(&mut result, "  {}", msg).unwrap();
            }
        }
        result
    }
}

impl From<serde_json::Error> for Error {
    fn from(error: serde_json::Error) -> Self {
        Error::new(error.to_string())
    }
}

impl From<io::Error> for Error {
    fn from(error: io::Error) -> Self {
        Error::new(error.to_string())
    }
}

impl From<rsass::Error> for Error {
    fn from(error: rsass::Error) -> Self {
        Error::new(error.to_string())
    }
}

impl From<regex_syntax::ast::Error> for Error {
    fn from(error: regex_syntax::ast::Error) -> Self {
        Error::new(error.to_string())
    }
}

impl From<String> for Error {
    fn from(error: String) -> Self {
        Error::new(error)
    }
}

impl From<PropertySheetError> for Error {
    fn from(error: PropertySheetError) -> Self {
        match error {
            PropertySheetError::InvalidFormat(e) => Self::from(e),
            PropertySheetError::InvalidRegex(e) => Self::regex(&e.to_string()),
            PropertySheetError::InvalidJSON(e) => Self::from(e),
        }
    }
}