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use crate::error::TexError;
use crate::Element;
use crate::*;

/// Used to attach elements to eachother
pub trait Attach {
    /// Takes an elemennt and pushes to &self.1
    /// Returns Result with either `()` or rank error
    fn attach(&mut self, element: Element) -> Result<(), TexError>;
}

impl Attach for Part {
    fn attach(&mut self, element: Element) -> Result<(), TexError> {
        if element.rank() > 0 {
            return Ok(self.1.push(element));
        }
        return Err(TexError::RankError);
    }
}

impl Attach for Chapter {
    fn attach(&mut self, element: Element) -> Result<(), TexError> {
        if element.rank() > 1 {
            return Ok(self.1.push(element));
        }
        return Err(TexError::RankError);
    }
}

impl Attach for Section {
    fn attach(&mut self, element: Element) -> Result<(), TexError> {
        if element.rank() > 2 {
            return Ok(self.1.push(element));
        }
        return Err(TexError::RankError);
    }
}

impl Attach for Paragraph {
    fn attach(&mut self, element: Element) -> Result<(), TexError> {
        if element.rank() > 3 {
            return Ok(self.1.as_mut().unwrap().push(element));
        }
        return Err(TexError::RankError);
    }
}

impl Attach for Environment {
    fn attach(&mut self, element: Element) -> Result<(), TexError> {
        if element.rank() > 7 {
            return Ok(self.1.push(String::from(element)));
        }
        return Err(TexError::RankError);
    }
}