#include <cstdint>
#include <cstddef>
#include "SceTypes.hpp"
#include "prx/libc/include/General.hpp"
#include <atomic>
#include <mutex>
#include <unordered_set>

// PSN is not emulated: the user is reported as signed out and online queries fail.
static constexpr int SCE_NP_ERROR_INVALID_ARGUMENT = static_cast<int>(0x80550003);
static constexpr int SCE_NP_ERROR_SIGNED_OUT = static_cast<int>(0x80550006);
static constexpr int SCE_NP_ERROR_USER_NOT_FOUND = static_cast<int>(0x80550007);
static constexpr int SCE_NP_ERROR_CALLBACK_ALREADY_REGISTERED = static_cast<int>(0x80550008);
static constexpr int SCE_NP_ERROR_CALLBACK_NOT_REGISTERED = static_cast<int>(0x80550009);
static constexpr int SCE_NP_ERROR_REQUEST_NOT_FOUND = static_cast<int>(0x80550014);
static constexpr uint32_t NP_STATE_SIGNED_OUT = 1;
static constexpr int NP_POLL_ASYNC_FINISHED = 0;
static constexpr uint32_t NP_REACHABILITY_STATE_UNAVAILABLE = 0;

static std::atomic<int> g_nextRequest{1};

namespace {
std::mutex reachabilityMutex;
void* reachabilityCallback = nullptr;
void* reachabilityUserdata = nullptr;
std::mutex requestMutex;
std::unordered_set<int> liveRequests;

int AddRequest() {
    const int reqId = g_nextRequest.fetch_add(1, std::memory_order_relaxed);
    std::lock_guard lock(requestMutex);
    liveRequests.insert(reqId);
    return reqId;
}
}

extern "C" {

int APS5_VABI sceNpAbortRequest(int req_id) {
    (void)req_id;
    return 0;
}

int APS5_VABI sceNpCheckCallback(void) {
    return 0;
}

int APS5_VABI sceNpCheckNpAvailability(int req_id, const NpOnlineId* online_id) {
 (void)req_id;
 if (!online_id) return SCE_NP_ERROR_INVALID_ARGUMENT;
 return SCE_NP_ERROR_USER_NOT_FOUND;
}

int APS5_VABI sceNpCheckNpReachability(int req_id, int user_id) {
 (void)req_id;
 (void)user_id;
 return SCE_NP_ERROR_SIGNED_OUT;
}

int APS5_VABI sceNpCheckPremium(int req_id, const NpCheckPremiumParameter* param, NpCheckPremiumResult* result) {
    (void)req_id;
    (void)param;
    (void)result;
    return SCE_NP_ERROR_SIGNED_OUT;
}

int APS5_VABI sceNpCreateAsyncRequest(const NpCreateAsyncRequestParameter* param) {
    (void)param;
    return AddRequest();
}

int APS5_VABI sceNpCreateRequest(void) {
    return AddRequest();
}

int APS5_VABI sceNpDeleteRequest(int req_id) {
    std::lock_guard lock(requestMutex);
    liveRequests.erase(req_id);
    return 0;
}

int APS5_VABI sceNpGetAccountAge(int req_id, int user_id, uint8_t* age) {
 (void)req_id;
 (void)user_id;
 if (!age) return SCE_NP_ERROR_INVALID_ARGUMENT;
 return SCE_NP_ERROR_SIGNED_OUT;
}

int APS5_VABI sceNpGetAccountCountryA(int user_id, void* country_code) {
    (void)user_id;
    (void)country_code;
    return SCE_NP_ERROR_SIGNED_OUT;
}

int APS5_VABI sceNpGetAccountIdA(int user_id, uint64_t* account_id) {
    (void)user_id;
    (void)account_id;
    return SCE_NP_ERROR_SIGNED_OUT;
}

int APS5_VABI sceNpGetNpId(int user_id, NpId* np_id) {
    (void)user_id;
    if (!np_id) return SCE_NP_ERROR_INVALID_ARGUMENT;
    return SCE_NP_ERROR_SIGNED_OUT;
}

int APS5_VABI sceNpGetNpReachabilityState(int user_id, uint32_t* state) {
    (void)user_id;
    if (!state) return SCE_NP_ERROR_INVALID_ARGUMENT;
    *state = NP_REACHABILITY_STATE_UNAVAILABLE;
    return 0;
}

int APS5_VABI sceNpGetOnlineId(int user_id, NpOnlineId* online_id) {
    (void)user_id;
    (void)online_id;
    return SCE_NP_ERROR_SIGNED_OUT;
}

int APS5_VABI sceNpGetState(int user_id, uint32_t* state) {
    (void)user_id;
    if (!state) return SCE_NP_ERROR_INVALID_ARGUMENT;
    *state = NP_STATE_SIGNED_OUT;
    return 0;
}

int APS5_VABI sceNpHasSignedUp(int user_id, bool* has_signed_up) {
    (void)user_id;
    if (!has_signed_up) return SCE_NP_ERROR_INVALID_ARGUMENT;
    *has_signed_up = false;
    return 0;
}

int APS5_VABI sceNpPollAsync(int req_id, int* result) {
    (void)req_id;
    if (result) *result = SCE_NP_ERROR_SIGNED_OUT;
    return NP_POLL_ASYNC_FINISHED;
}

void APS5_VABI sceNpRegisterGamePresenceCallback(void* callback, void* userdata) {
 (void)callback;
 (void)userdata;
 NotImplemented_nid_no_patch(__func__);
}

int APS5_VABI sceNpRegisterNpReachabilityStateCallback(void* callback, void* userdata) {
    if (!callback) return SCE_NP_ERROR_INVALID_ARGUMENT;
    std::lock_guard lock(reachabilityMutex);
    if (reachabilityCallback) return SCE_NP_ERROR_CALLBACK_ALREADY_REGISTERED;
    reachabilityCallback = callback;
    reachabilityUserdata = userdata;
    return 0;
}

int APS5_VABI sceNpUnregisterNpReachabilityStateCallback(void) {
    std::lock_guard lock(reachabilityMutex);
    if (!reachabilityCallback) return SCE_NP_ERROR_CALLBACK_NOT_REGISTERED;
    reachabilityCallback = nullptr;
    reachabilityUserdata = nullptr;
    return 0;
}

int APS5_VABI sceNpRegisterPlusEventCallback(void* callback, void* userdata) {
    (void)userdata;
    if (!callback) return SCE_NP_ERROR_INVALID_ARGUMENT;
    return 0;
}

int APS5_VABI sceNpRegisterPremiumEventCallback(void* callback, void* userdata) {
    (void)userdata;
    if (!callback) return SCE_NP_ERROR_INVALID_ARGUMENT;
    return 0;
}

int APS5_VABI sceNpRegisterStateCallback(void* callback, void* userdata) {
    (void)userdata;
    if (!callback) return SCE_NP_ERROR_INVALID_ARGUMENT;
    return 0;
}

int APS5_VABI sceNpSetContentRestriction(const NpContentRestriction* restriction) {
 (void)restriction;
 NotImplemented_nid_no_patch(__func__);
 return 0;
}

int APS5_VABI sceNpSetNpTitleId(const NpTitleId* title_id, const NpTitleSecret* title_secret) {
    (void)title_id;
    (void)title_secret;
    return 0;
}

int APS5_VABI sceNpSetTimeout(int reqId, int32_t resolveRetry, uint32_t resolveTimeout, uint32_t connTimeout,
    uint32_t sendTimeout, uint32_t recvTimeout) {
    constexpr uint32_t minResolveTimeout = 1000000;
    constexpr uint32_t minTransferTimeout = 10000000;
    auto belowMinimum = [](uint32_t timeout, uint32_t minimum) { return timeout != 0 && timeout < minimum; };
    if (reqId <= 0 || resolveRetry < 0) return SCE_NP_ERROR_INVALID_ARGUMENT;
    if (resolveRetry == 0 && resolveTimeout == 0 && connTimeout == 0 && sendTimeout == 0 && recvTimeout == 0) {
        return SCE_NP_ERROR_INVALID_ARGUMENT;
    }
    if (belowMinimum(resolveTimeout, minResolveTimeout) || belowMinimum(connTimeout, minTransferTimeout) ||
        belowMinimum(sendTimeout, minTransferTimeout) || belowMinimum(recvTimeout, minTransferTimeout)) {
        return SCE_NP_ERROR_INVALID_ARGUMENT;
    }
    std::lock_guard lock(requestMutex);
    return liveRequests.count(reqId) ? 0 : SCE_NP_ERROR_REQUEST_NOT_FOUND;
}

int APS5_VABI sceNpUnregisterStateCallback(void) {
    return 0;
}

int APS5_VABI sceNpGetAccountLanguage2(int req_id, int user_id, void* language) {
    (void)req_id;
    (void)user_id;
    (void)language;
    return SCE_NP_ERROR_SIGNED_OUT;
}

int APS5_VABI sceNpNotifyPremiumFeature(const void* param) {
    (void)param;
    return 0;
}

int APS5_VABI sceNpRegisterStateCallbackA(void* callback, void* userdata) {
    (void)userdata;
    if (!callback) return SCE_NP_ERROR_INVALID_ARGUMENT;
    return 1;
}

int APS5_VABI sceNpUnregisterStateCallbackA(int callback_id) {
    (void)callback_id;
    return 0;
}

int APS5_VABI sceNpUnregisterPremiumEventCallback(void) {
    return 0;
}

int APS5_VABI sceNpGetUserIdByAccountId() {
    NotImplemented_nid_no_patch(__func__);
    return 0;
}

int APS5_VABI sceNpGetSandboxInfo(void* sandbox_info) {
    (void)sandbox_info;
    NotImplemented_nid_no_patch(__func__);
    return 0;
}

}