mod pl;

use std::collections::HashMap;

pub struct I18n {
    store: HashMap<String, HashMap<String, &'static str>>,
    lang: String,
}

impl I18n {
    pub fn load() -> Self {
        let mut i18n = Self {
            store: HashMap::with_capacity(1_000),
            lang: "".into(),
        };
        pl::define(&mut i18n);
        let languages: js_sys::Array = seed::window().navigator().languages();
        languages.find(&mut |lang, _idx, _array| {
            let l: wasm_bindgen::JsValue = lang;
            if let Some(s) = l.as_string() {
                if i18n.store.contains_key(&s) {
                    i18n.lang = s;
                    true
                } else {
                    false
                }
            } else {
                false
            }
        });
        i18n
    }

    fn scope(&mut self, lang: &'static str) -> Scope {
        Scope { store: self, lang }
    }

    pub fn t(&self, key: &'static str) -> &'static str {
        self.store
            .get(self.lang.as_str())
            .and_then(|s| s.get(key))
            .copied()
            .unwrap_or(key)
    }

    pub fn l(&self, key: &String) -> String {
        self.store
            .get(self.lang.as_str())
            .and_then(|s| s.get(key))
            .copied()
            .map(Into::into)
            .unwrap_or_else(|| key.clone())
    }
}

pub struct Scope<'store, 'lang> {
    lang: &'lang str,
    store: &'store mut I18n,
}
impl<'store, 'lang> Scope<'store, 'lang> {
    fn define(&mut self, key: &str, value: &'static str) -> &mut Self {
        self.store
            .store
            .entry(self.lang.into())
            .or_insert_with(|| HashMap::with_capacity(1_000))
            .insert(key.into(), value);
        self
    }
}