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use crate::context::Context;
use crate::decorators::{DecoratorDef, DecoratorResult};
use crate::error::RenderError;
use crate::registry::Registry;
use crate::render::{Decorator, RenderContext};

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

fn get_name<'reg: 'rc, 'rc>(d: &Decorator<'reg, 'rc>) -> Result<String, RenderError> {
    d.param(0)
        .ok_or_else(|| RenderError::new("Param required for decorator \"inline\""))
        .and_then(|v| {
            v.value()
                .as_str()
                .map(|v| v.to_owned())
                .ok_or_else(|| RenderError::new("inline name must be string"))
        })
}

impl DecoratorDef for InlineDecorator {
    fn call<'reg: 'rc, 'rc>(
        &self,
        d: &Decorator<'reg, 'rc>,
        _: &'reg Registry<'reg>,
        _: &'rc Context,
        rc: &mut RenderContext<'reg, 'rc>,
    ) -> DecoratorResult {
        let name = get_name(d)?;

        let template = d
            .template()
            .ok_or_else(|| RenderError::new("inline should have a block"))?;

        rc.set_partial(name, template);
        Ok(())
    }
}

pub static INLINE_DECORATOR: InlineDecorator = InlineDecorator;

#[cfg(test)]
mod test {
    use crate::context::Context;
    use crate::registry::Registry;
    use crate::render::{Evaluable, RenderContext};
    use crate::template::Template;

    #[test]
    fn test_inline() {
        let t0 =
            Template::compile("{{#*inline \"hello\"}}the hello world inline partial.{{/inline}}")
                .ok()
                .unwrap();

        let hbs = Registry::new();

        let ctx = Context::null();
        let mut rc = RenderContext::new(None);
        t0.elements[0].eval(&hbs, &ctx, &mut rc).unwrap();

        assert!(rc.get_partial(&"hello".to_owned()).is_some());
    }
}