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use rs_es::query::Query;

pub trait VectorOfTerms<T> {
  /// Extract the elements inside `Vec<T>` into `Vec<Filter>`, if present.
  /// Every element will be mapped into a `JsonVal`.
  fn build_terms(key: &str, values: &Vec<T>) -> Vec<Query>;
}

impl VectorOfTerms<String> for Query {
  fn build_terms(key: &str, values: &Vec<String>) -> Vec<Query> {
    if values.is_empty() {
      return vec![];
    }

    vec![
      Query::build_terms(key).with_values(values.iter()
                                                .map(AsRef::as_ref)
                                                .collect::<Vec<&str>>()).build()
    ]
  }
}

macro_rules! build_vector_of_terms_impl {
  ($t:ty) => {
    impl<'a> VectorOfTerms<$t> for Query {
      fn build_terms(key: &str, values: &Vec<$t>) -> Vec<Query> {
        if values.is_empty() {
          return vec![];
        }

        vec![
          Query::build_terms(key).with_values(values.to_owned())
                                 .build()
        ]
      }
    }
  }
}

build_vector_of_terms_impl!(i32);

#[cfg(test)]
mod tests {
  use terms::*;
  use rs_es::query::Query;
  use serde_json;

  #[test]
  fn test_vector_of_terms() {
    assert!(<Query as VectorOfTerms<String>>::build_terms("work_roles", &vec![])
                                              .is_empty());

    {
      let filters = <Query as VectorOfTerms<String>>::build_terms(
                      "work_roles", &vec!["Fullstack".to_owned()]);
      assert_eq!(serde_json::to_string(&filters[0]).unwrap(),
                  "{\"terms\":{\"work_roles\":[\"Fullstack\"]}}".to_owned());
    }

    {
      let filters = <Query as VectorOfTerms<i32>>::build_terms(
                  "work_roles", &vec![1]);
      assert_eq!(serde_json::to_string(&filters[0]).unwrap(),
                  "{\"terms\":{\"work_roles\":[1]}}".to_owned());
    }
  }
}