HostProtocolBridge.cpp

#include "HostProtocolBridge.h"

#include <type_traits>

std::optional<HostDispatchResult> DispatchHostInboundMessageJson(
    const std::wstring& jsonText,
    const ClientCallbackRegistry& callbacks) {
    // Parse the raw WebView2 JSON payload into a typed message before touching app logic.
    const auto message = ParseHostInboundMessageJson(jsonText);
    if (!message.has_value()) {
        return std::nullopt;
    }

    HostDispatchResult result;
    std::visit([&](const auto& payload) {
        using T = std::decay_t<decltype(payload)>;
        if constexpr (std::is_same_v<T, PageReadyMessage>) {
            result.isPageReady = true;
        }
        else if constexpr (std::is_same_v<T, QuestionMessage>) {
            // Question ids are the bridge contract between the page/server and native callback registry.
            const auto answerText = callbacks.Invoke(payload.id);
            if (answerText.has_value()) {
                result.answer = AnswerMessage{ payload.id, answerText.value() };
            }
        }
    }, message.value());

    return result;
}