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use crate::attribute_list::AttributeList;
use std::error::Error;
use syn::{parse::Parse, parse_str, Expr, ExprLit, Lit, Meta, Path};

const DEFAULT_CRATE_NAME: &str = "autophagy";

pub fn parse_crate_path(attributes: &AttributeList) -> Result<Path, Box<dyn Error>> {
    Ok(parse_string_attribute(attributes, "crate")?.unwrap_or(parse_str(DEFAULT_CRATE_NAME)?))
}

fn parse_string_attribute<T: Parse>(
    attributes: &AttributeList,
    key: &str,
) -> Result<Option<T>, Box<dyn Error>> {
    Ok(attributes
        .variables()
        .find_map(|meta| match meta {
            Meta::NameValue(name_value) => {
                if name_value.path.is_ident(key) {
                    if let Expr::Lit(ExprLit {
                        lit: Lit::Str(string),
                        ..
                    }) = &name_value.value
                    {
                        Some(string.value())
                    } else {
                        None
                    }
                } else {
                    None
                }
            }
            _ => None,
        })
        .map(|string| parse_str(&string))
        .transpose()?)
}