#pragma once
#include "core/result/Result.h"

#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonObject>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QObject>

#include <functional>

namespace fincept {

/// Async HTTP client wrapping QNetworkAccessManager. Responses delivered on the Qt event loop.
class HttpClient : public QObject {
    Q_OBJECT
  public:
    static HttpClient& instance();

    using JsonCallback = std::function<void(Result<QJsonDocument>)>;

    /// `context` scopes callback lifetime — pass `this` from anything that can outlive its reply.
    /// nullptr is safe only for objects whose lifetime equals the app's (singletons).
    void get(const QString& url, JsonCallback callback, const QObject* context = nullptr);
    void post(const QString& url, const QJsonObject& body, JsonCallback callback, const QObject* context = nullptr);
    void put(const QString& url, const QJsonObject& body, JsonCallback callback, const QObject* context = nullptr);
    void del(const QString& url, JsonCallback callback, const QObject* context = nullptr);
    void del(const QString& url, const QJsonObject& body, JsonCallback callback, const QObject* context = nullptr);

    void set_auth_header(const QString& api_key);
    void set_session_token(const QString& token);
    void clear_session_token();
    void set_base_url(const QString& base);

  private:
    HttpClient();
    QNetworkRequest build_request(const QString& url) const;
    void handle_reply(QNetworkReply* reply, JsonCallback callback, const QObject* context);

    QNetworkAccessManager* nam_ = nullptr;
    QString base_url_;
    QString api_key_;
    QString session_token_;
};

} // namespace fincept