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use std::collections::HashMap;
use serialize::json::ToJson;
use template::{Template, TemplateError};
use render::{Renderable, RenderError, RenderContext};
use helpers::{HelperDef};
use context::{Context};
use helpers;

pub struct Registry {
    templates: HashMap<String, Template>,
    helpers: HashMap<String, Box<HelperDef + 'static>>
}

impl Registry {
    pub fn new() -> Registry {
        let mut r = Registry {
            templates: HashMap::new(),
            helpers: HashMap::new()
        };

        r.register_helper("if", Box::new(helpers::IF_HELPER));
        r.register_helper("unless", Box::new(helpers::UNLESS_HELPER));
        r.register_helper("each", Box::new(helpers::EACH_HELPER));
        r.register_helper("with", Box::new(helpers::WITH_HELPER));
        r.register_helper("lookup", Box::new(helpers::LOOKUP_HELPER));
        r.register_helper("raw", Box::new(helpers::RAW_HELPER));
        r.register_helper(">", Box::new(helpers::INCLUDE_HELPER));
        r.register_helper("block", Box::new(helpers::BLOCK_HELPER));
        r.register_helper("partial", Box::new(helpers::PARTIAL_HELPER));
        r.register_helper("log", Box::new(helpers::LOG_HELPER));

        r
    }

    pub fn register_template(&mut self, name: &str, template: Template) {
        self.templates.insert(name.to_string(), template);
    }

    pub fn register_template_string(&mut self, name: &str, tpl_str: String) -> Result<(), TemplateError>{
        let t = Template::compile(tpl_str);
        if let Ok(tpl) = t {
            self.templates.insert(name.to_string(), tpl);
            Ok(())
        } else {
            Err(t.err().unwrap())
        }
    }

    pub fn unregister_template(&mut self, name: &String) {
        self.templates.remove(name);
    }

    pub fn register_helper(&mut self, name: &str, def: Box<HelperDef + 'static>) -> Option<Box<HelperDef + 'static>> {
        self.helpers.insert(name.to_string(), def)
    }

    pub fn get_template(&self, name: &String) -> Option<&Template> {
        self.templates.get(name)
    }

    pub fn get_helper(&self, name: &String) -> Option<&Box<HelperDef + 'static>> {
        self.helpers.get(name)
    }

    pub fn get_templates(&self) -> &HashMap<String, Template> {
        &self.templates
    }

    pub fn clear_templates(&mut self) {
        self.templates.clear();
    }

    pub fn render<T>(&self, name: &str, ctx: &T) -> Result<String, RenderError>
        where T: ToJson {
            let template = self.get_template(&name.to_string());
            let context = Context::wraps(ctx);
            let mut render_context = RenderContext::new();
            if let Some(t) = template {
                (*t).render(&context, self, &mut render_context)
            } else {
                Err(RenderError{
                    desc: "Template not found."
                })
            }
        }
}

#[cfg(test)]
mod test {
    use template::{Template};
    use registry::{Registry};
    use render::{RenderContext, Renderable, RenderError, Helper};
    use helpers::{HelperDef};
    use context::{Context};

    #[derive(Clone, Copy)]
    struct DummyHelper;

    impl HelperDef for DummyHelper {
        fn call(&self, c: &Context, h: &Helper, r: &Registry, rc: &mut RenderContext) -> Result<String, RenderError> {
            h.template().unwrap().render(c, r, rc)
        }
    }

    static DUMMY_HELPER: DummyHelper = DummyHelper;

    #[test]
    fn test_registry_operations() {
        let mut r = Registry::new();

        let t = Template::compile("<h1></h1>".to_string()).ok().unwrap();
        r.register_template("index", t.clone());

        let t2 = Template::compile("<h2></h2>".to_string()).ok().unwrap();
        r.register_template("index2", t2.clone());

        assert_eq!((*r.get_template(&("index".to_string())).unwrap()).to_string(),
                   t.to_string());
        assert_eq!(r.templates.len(), 2);

        r.unregister_template(&("index".to_string()));
        assert_eq!(r.templates.len(), 1);

        r.clear_templates();
        assert_eq!(r.templates.len(), 0);

        r.register_helper("dummy", Box::new(DUMMY_HELPER));

        // built-in helpers plus 1
        assert_eq!(r.helpers.len(), 10+1);
    }
}