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use proc_macro2::TokenStream;
use quote::ToTokens;
use syn::{Ident, parse::{Parse, ParseStream, Result}, Token, Expr};

use crate::refident::RefIdent;

#[derive(Debug, PartialEq, Clone)]
pub(crate) struct ValueList {
    pub(crate) arg: Ident,
    pub(crate) values: Vec<Expr>,
}

impl Parse for ValueList {
    fn parse(input: ParseStream) -> Result<Self> {
        let arg = input.parse()?;
        let _to: Token![=>] = input.parse()?;
        let content;
        let paren = syn::bracketed!(content in input);
        let values = content
            .parse_terminated::<_, Token![,]>(Parse::parse)?
            .into_iter()
            .collect();

        let ret = Self {
            arg,
            values,
        };
        if ret.values.len() == 0 {
            Err(syn::Error::new(paren.span, "Values list should not be empty"))
        } else {
            Ok(ret)
        }
    }
}

impl RefIdent for ValueList {
    fn ident(&self) -> &Ident {
        &self.arg
    }
}

impl ToTokens for ValueList {
    fn to_tokens(&self, tokens: &mut TokenStream) {
        self.arg.to_tokens(tokens)
    }
}

#[cfg(test)]
mod should {
    use crate::test::{*, assert_eq};

    use super::*;

    mod parse_values_list {
        use super::*;
        use super::assert_eq;

        fn parse_values_list<S: AsRef<str>>(values_list: S) -> ValueList {
            parse_meta(values_list)
        }

        #[test]
        fn some_literals() {
            let literals = literal_expressions_str();
            let name = "argument";

            let values_list = parse_values_list(
                format!(r#"{} => [{}]"#, name,
                        literals
                            .iter()
                            .map(ToString::to_string)
                            .collect::<Vec<String>>()
                            .join(", "))
            );

            assert_eq!(name, &values_list.arg.to_string());
            assert_eq!(values_list.args(), to_args!(literals));
        }

        #[test]
        fn raw_code() {
            let values_list = parse_values_list(r#"no_mater => [vec![1,2,3]]"#);

            assert_eq!(values_list.args(), to_args!(["vec![1, 2, 3]"]));
        }

        #[test]
        #[should_panic]
        fn raw_code_with_parsing_error() {
            parse_values_list(r#"other => [some:<>(1,2,3)]"#);
        }

        #[test]
        #[should_panic(expected = r#"expected square brackets"#)]
        fn forget_brackets() {
            parse_values_list(r#"other => 42"#);
        }
    }
}