use wasm_bindgen::JsCast;

pub struct HttpClient;

impl HttpClient {
    /// Fetch tile data with caching
    pub async fn fetch_cached(url: &str) -> Option<Vec<u8>> {
        let window = web_sys::window()?;
        let caches = window.caches().ok()?;
        let cache_name = "map-data-v5-sand";
        let cache = wasm_bindgen_futures::JsFuture::from(caches.open(cache_name)).await.ok()?;
        let cache: web_sys::Cache = cache.dyn_into().ok()?;

        let request = web_sys::Request::new_with_str(url).ok()?;
        let match_promise = cache.match_with_request(&request);
        let match_val = wasm_bindgen_futures::JsFuture::from(match_promise).await.ok()?;

        if !match_val.is_undefined() {
            let response: web_sys::Response = match_val.dyn_into().ok()?;
            let buffer_promise = response.array_buffer().ok()?;
            let buffer = wasm_bindgen_futures::JsFuture::from(buffer_promise).await.ok()?;
            let array = js_sys::Uint8Array::new(&buffer);
            return Some(array.to_vec());
        }

        // Network fetch
        let response_val = wasm_bindgen_futures::JsFuture::from(window.fetch_with_request(&request)).await.ok()?;
        let response: web_sys::Response = response_val.dyn_into().ok()?;
        
        // Clone response for cache
        let response_clone = response.clone().ok()?;
        let put_promise = cache.put_with_request(&request, &response_clone);
        wasm_bindgen_futures::JsFuture::from(put_promise).await.ok()?;

        let buffer_promise = response.array_buffer().ok()?;
        let buffer = wasm_bindgen_futures::JsFuture::from(buffer_promise).await.ok()?;
        let array = js_sys::Uint8Array::new(&buffer);
        Some(array.to_vec())
    }
}