final_text.h

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// SPDX-License-Identifier: Apache-2.0
#pragma once
 
#include <nlohmann/json.hpp>
 
#include <string>
 
namespace facade_text {
 
inline std::string extract_final_text(const char* result_json) {
    if (result_json == nullptr) {
        return {};
    }
    auto arr = nlohmann::json::parse(result_json, nullptr, false);
    if (!arr.is_array()) {
        return {};
    }
    for (auto it = arr.rbegin(); it != arr.rend(); ++it) {
        if (!it->is_object() || it->value("role", "") != "assistant") {
            continue;
        }
        auto content = it->value("content", "");
        if (!content.empty()) {
            return content;
        }
    }
    return {};
}
 
inline std::string no_response_reason(const char* result_json) {
    auto arr = (result_json != nullptr)
                   ? nlohmann::json::parse(result_json, nullptr, false)
                   : nlohmann::json();
    if (!arr.is_array()) {
        return "(no response: the engine returned no readable conversation)";
    }
 
    bool saw_assistant = false;
    for (const auto& msg : arr) {
        if (msg.is_object() && msg.value("role", "") == "assistant") {
            saw_assistant = true;
            break;
        }
    }
    if (!saw_assistant) {
        return "(no response: the turn produced no assistant message at all)";
    }
    return "(no response: the turn ended with every assistant message empty — "
           "the tier most likely stopped without calling entropic.complete)";
}
 
inline std::string final_text_or_reason(const char* result_json) {
    auto text = extract_final_text(result_json);
    return text.empty() ? no_response_reason(result_json) : text;
}
 
}  // namespace facade_text