#include <cstddef>
#include <cstdint>
#include <cstring>
#include <cstdlib>
#include <charconv>
#include <stdexcept>
#include <string>
#include <string_view>
#include <system_error>
#include "prx/libc/include/Shutdown.hpp"
#include "SceTypes.hpp"
#include "prx/libc/include/General.hpp"
#include "prx/libkernel/KernelErrors.hpp"
#include "prx/libSceSystemService/SystemService.hpp"

namespace {

int ConsoleLanguage() {
    const char* configured = std::getenv("ANYPS5_LANGUAGE");
    if (configured == nullptr || configured[0] == '\0') return SYSTEM_SERVICE_PARAM_LANG_ENGLISH_US;
    const std::string_view text(configured);
    int language = -1;
    const auto [end, error] = std::from_chars(text.data(), text.data() + text.size(), language);
    if (error != std::errc{} || end != text.data() + text.size() || language < SYSTEM_SERVICE_PARAM_LANG_JAPANESE || language > SYSTEM_SERVICE_PARAM_LANG_UKRAINIAN) {
        throw std::runtime_error("sceSystemServiceParamGetInt: ANYPS5_LANGUAGE must be a console language number from " +
            std::to_string(SYSTEM_SERVICE_PARAM_LANG_JAPANESE) + " to " + std::to_string(SYSTEM_SERVICE_PARAM_LANG_UKRAINIAN) +
            ", not \"" + std::string(text) + "\"");
    }
    return language;
}

}

extern "C" {

int APS5_VABI sceSystemServiceLoadExec(const char* path, const char* const* arguments) {
    if (!path || !*path) return SYSTEM_SERVICE_ERROR_PARAMETER;
    if (std::strcmp(path, "exit") != 0) {
        NotImplemented_nid_no_patch("sceSystemServiceLoadExec: executable replacement");
    }
    (void)arguments;
    LibcRunShutdown_nid_postfix();
    std::exit(0);
}

int APS5_VABI sceSystemServiceDisableNoticeScreenSkipFlagAutoSet(void) {
 return SYSTEM_SERVICE_OK;
}

int APS5_VABI sceSystemServiceGetDisplaySafeAreaInfo(SystemServiceDisplaySafeAreaInfo* info) {
 if (info == nullptr) {
  return SYSTEM_SERVICE_ERROR_PARAMETER;
 }
 *info = SystemServiceDisplaySafeAreaInfo{};
 info->ratio = 1.0f;
 return SYSTEM_SERVICE_OK;
}

int APS5_VABI sceSystemServiceGetHdrToneMapLuminance(SystemServiceHdrToneMapLuminance* luminance) {
 if (luminance == nullptr) {
  return SYSTEM_SERVICE_ERROR_PARAMETER;
 }
 constexpr float SdrReferenceWhiteNits = 100.0f;
 luminance->max_full_frame_tone_map_luminance = SdrReferenceWhiteNits;
 luminance->max_tone_map_luminance = SdrReferenceWhiteNits;
 luminance->min_tone_map_luminance = 0.0f;
 return SYSTEM_SERVICE_OK;
}

int APS5_VABI sceSystemServiceGetNoticeScreenSkipFlag(bool* value) {
 if (value == nullptr) {
  return SYSTEM_SERVICE_ERROR_PARAMETER;
 }
 *value = false;
 return SYSTEM_SERVICE_OK;
}

int APS5_VABI sceSystemServiceGetStatus(SystemServiceStatus* status) {
 if (status == nullptr) {
  return SYSTEM_SERVICE_ERROR_PARAMETER;
 }
 *status = SystemServiceStatus{};
 return SYSTEM_SERVICE_OK;
}

int APS5_VABI sceSystemServiceHideSplashScreen(void) {
 return SYSTEM_SERVICE_OK;
}

int APS5_VABI sceSystemServiceParamGetInt(int paramId, int* value) {
 if (value == nullptr) {
  return SYSTEM_SERVICE_ERROR_PARAMETER;
 }
 switch (paramId) {
  case SYSTEM_SERVICE_PARAM_ID_LANG: *value = ConsoleLanguage(); break;
  case SYSTEM_SERVICE_PARAM_ID_DATE_FORMAT: *value = SYSTEM_SERVICE_PARAM_DATE_FORMAT_DDMMYYYY; break;
  case SYSTEM_SERVICE_PARAM_ID_TIME_FORMAT: *value = SYSTEM_SERVICE_PARAM_TIME_FORMAT_24HOUR; break;
  case SYSTEM_SERVICE_PARAM_ID_TIME_ZONE: *value = 0; break;
  case SYSTEM_SERVICE_PARAM_ID_SUMMERTIME: *value = 0; break;
  case SYSTEM_SERVICE_PARAM_ID_GAME_PARENTAL_LEVEL: *value = SYSTEM_SERVICE_PARAM_GAME_PARENTAL_OFF; break;
  case SYSTEM_SERVICE_PARAM_ID_ENTER_BUTTON_ASSIGN: *value = SYSTEM_SERVICE_PARAM_ENTER_BUTTON_CROSS; break;
  default: *value = 0; break;
 }
 return SYSTEM_SERVICE_OK;
}

int APS5_VABI sceSystemServiceParamGetString(int paramId, char* buf, size_t bufSize) {
 if (buf == nullptr || bufSize == 0) {
  return SYSTEM_SERVICE_ERROR_PARAMETER;
 }
 if (paramId != SYSTEM_SERVICE_PARAM_ID_SYSTEM_NAME) {
  NotImplemented_nid_no_patch("sceSystemServiceParamGetString: parameter other than the system name");
 }
 if (bufSize < SYSTEM_SERVICE_MAX_SYSTEM_NAME_LENGTH) {
  NotImplemented_nid_no_patch("sceSystemServiceParamGetString: buffer shorter than 65 bytes");
 }
 constexpr char SystemName[] = "PS5";
 std::memcpy(buf, SystemName, sizeof(SystemName));
 return SYSTEM_SERVICE_OK;
}

int APS5_VABI sceSystemServicePowerTick(void) {
 return SYSTEM_SERVICE_OK;
}

int APS5_VABI sceSystemServiceReceiveEvent(SystemServiceEvent* event) {
 if (event == nullptr) {
  return SYSTEM_SERVICE_ERROR_PARAMETER;
 }
 return SYSTEM_SERVICE_ERROR_NO_EVENT;
}

int APS5_VABI sceSystemServiceReportAbnormalTermination(const void* info) {
 (void)info;
 return SYSTEM_SERVICE_OK;
}

int APS5_VABI sceSystemServiceSetNoticeScreenSkipFlag(void) {
 return SYSTEM_SERVICE_OK;
}

int APS5_VABI sceSystemServiceInitializePlayerDialogParam(void* param) {
 if (param == nullptr) return SYSTEM_SERVICE_ERROR_PARAMETER;
 return SYSTEM_SERVICE_OK;
}

int APS5_VABI sceSystemServiceDisableMediaPlay() {
 return SYSTEM_SERVICE_OK;
}

int APS5_VABI sceSystemServiceReenableMediaPlay() {
 return SYSTEM_SERVICE_OK;
}

int APS5_VABI sceSystemServiceLaunchPlayerDialog(const void* param) {
 if (param == nullptr) return SYSTEM_SERVICE_ERROR_PARAMETER;
 return SYSTEM_SERVICE_OK;
}

int APS5_VABI sceSystemServiceLaunchWebBrowser(const char* uri, void* param) {
 (void)uri;
 (void)param;
 return SCE_KERNEL_ERROR_EOPNOTSUPP;
}

int APS5_VABI sceSystemServiceDisableMusicPlayer(void) {
 return SYSTEM_SERVICE_OK;
}

int APS5_VABI sceSystemServiceOpenChallengeActivity(void) {
 NotImplemented_nid_no_patch(__func__);
 return 0;
}

int APS5_VABI sceSystemServiceOpenTournamentOccurrence(void) {
 NotImplemented_nid_no_patch(__func__);
 return 0;
}

int APS5_VABI sceSystemServiceReenableMusicPlayer(void) {
 return SYSTEM_SERVICE_OK;
}

int APS5_VABI sceSystemServiceShowControllerSettings(void) {
 NotImplemented_nid_no_patch(__func__);
 return 0;
}

int APS5_VABI sceSystemServiceGetAppIdOfRunningBigApp(void) {
 return SYSTEM_SERVICE_RUNNING_APP_ID;
}

int APS5_VABI sceSystemServiceKillApp(int appId, int how, int reason, int coreDump) {
 if (appId != SYSTEM_SERVICE_RUNNING_APP_ID) {
  NotImplemented_nid_no_patch("sceSystemServiceKillApp: application other than the running title");
 }
 if (how != -1 || reason != 0 || coreDump != 0) {
  NotImplemented_nid_no_patch("sceSystemServiceKillApp: arguments other than -1, 0 and 0");
 }
 LibcExit_nid_no_patch(0);
}

}