ImHex/lib/libimhex/include/hex/helpers/http_requests_emscripten.hpp

#pragma once

#include <future>

#include <emscripten/fetch.h>

namespace hex {
    template<typename T>
    std::future<HttpRequest::Result<T>> HttpRequest::downloadFile(const std::fs::path &path) {
        return std::async(std::launch::async, [this, path] {
            std::vector<u8> response;

            // Execute the request
            auto result = this->executeImpl<T>(response);

            // Write the result to the file
            wolv::io::File file(path, wolv::io::File::Mode::Create);
            file.writeBuffer(reinterpret_cast<const u8*>(result.getData().data()), result.getData().size());

            return result;
        });
    }

    template<typename T>
    std::future<HttpRequest::Result<T>> HttpRequest::uploadFile(const std::fs::path &path, const std::string &mimeName) {
        hex::unused(path, mimeName);
        throw std::logic_error("Not implemented");
    }

    template<typename T>
    std::future<HttpRequest::Result<T>> HttpRequest::uploadFile(std::vector<u8> data, const std::string &mimeName, const std::fs::path &fileName) {
        hex::unused(data, mimeName, fileName);
        throw std::logic_error("Not implemented");
    }

    template<typename T>
    std::future<HttpRequest::Result<T>> HttpRequest::execute() {
        return std::async(std::launch::async, [this] {
            std::vector<u8> responseData;
            
            return this->executeImpl<T>(responseData);
        });
    }

    template<typename T>
    HttpRequest::Result<T> HttpRequest::executeImpl(std::vector<u8> &data) {
        strcpy(m_attr.requestMethod, m_method.c_str());
        m_attr.attributes = EMSCRIPTEN_FETCH_SYNCHRONOUS | EMSCRIPTEN_FETCH_LOAD_TO_MEMORY;

        if (!m_body.empty()) {
            m_attr.requestData = m_body.c_str();
            m_attr.requestDataSize = m_body.size();
        }

        std::vector<const char*> headers;
        for (auto it = m_headers.begin(); it != m_headers.end(); it++) {
            headers.push_back(it->first.c_str());
            headers.push_back(it->second.c_str());
        }
        headers.push_back(nullptr);
        m_attr.requestHeaders = headers.data();

        // Send request
        emscripten_fetch_t* fetch = emscripten_fetch(&m_attr, m_url.c_str());

        data.resize(fetch->numBytes);
        std::copy(fetch->data, fetch->data + fetch->numBytes, data.begin());

        return Result<T>(fetch->status, { data.begin(), data.end() });
    }

}