use handlebars::*;

#[derive(Clone, Copy)]
pub struct ContainsHelper;

impl HelperDef for ContainsHelper {
    fn call<'reg: 'rc, 'rc>(&self, h: &Helper<'reg, 'rc>, r: &'reg Handlebars<'_>, ctx: &'rc Context, rc: &mut RenderContext<'reg, 'rc>, out: &mut dyn Output) -> HelperResult {
        let array = h.param(0).map(|v| serde_json::from_value::<Vec<String>>(v.value().clone()).unwrap()).ok_or(RenderError::new("Parameter not found!"))?;
        let value = h.param(1).map(|v| v.value().as_str().unwrap()).ok_or(RenderError::new("Parameter not found!"))?;

        let tmpl = if array.contains(&String::from(value)) { h.template() } else { h.inverse() };

        match tmpl {
            Some(ref t) => t.render(r, ctx, rc, out),
            None => Ok(()),
        }
    }
}