#include "SdCardManager.h"
#include "fsfw/ipc/MutexFactory.h"
#include "fsfw/serviceinterface/ServiceInterface.h"

#include <fstream>
#include <filesystem>

SdCardManager* SdCardManager::factoryInstance = nullptr;

SdCardManager::SdCardManager() {
}

SdCardManager::~SdCardManager() {
}

void SdCardManager::create() {
    if(factoryInstance == nullptr) {
        factoryInstance = new SdCardManager();
    }
}

SdCardManager* SdCardManager::instance() {
    SdCardManager::create();
    return SdCardManager::factoryInstance;
}

ReturnValue_t SdCardManager::switchOnSdCard(sd::SdCard sdCard) {
    if(sdCardActive(sdCard)) {
        return ALREADY_ON;
    }
    return HasReturnvaluesIF::RETURN_OK;
}

ReturnValue_t SdCardManager::switchOffSdCard(sd::SdCard sdCard) {
    return HasReturnvaluesIF::RETURN_OK;
}

bool SdCardManager::sdCardActive(sd::SdCard sdCard) {
    using namespace std;
    if(not filesystem::exists("/tmp/sd_status.txt")) {
        ReturnValue_t result = updateSdCardStateFile();
        if(result != HasReturnvaluesIF::RETURN_OK) {
            return result;
        }
    }

    // Now the file should exist in any case. Still check whether it exists.
    fstream sdStatus("/tmp/sd_status.txt");
    if (not sdStatus.good()) {
        return false;
    }
    string line;
    uint8_t idx = 0;
    while (std::getline(sdStatus, line)) {
        istringstream iss(line);
        string word;
        if((sdCard == sd::SdCard::SLOT_0 and idx == 0) or
                (sdCard == sd::SdCard::SLOT_1 and idx == 1)) {
            while(iss >> word) {
                if(word == "on") {
                    return true;
                }
                else {
                    return false;
                }
            }
        }
        idx++;
    }
    return HasReturnvaluesIF::RETURN_OK;
    return false;
}

sd::SdCard SdCardManager::getPreferredSdCard() const {
    return preferredSdCard;
}

void SdCardManager::setPreferredSdCard(sd::SdCard sdCard) {
    preferredSdCard = sdCard;
}

ReturnValue_t SdCardManager::updateSdCardStateFile() {
    int result = std::system("q7hw sd info all > /tmp/sd_status.txt");
    if(result == 0) {
        return HasReturnvaluesIF::RETURN_OK;
    }
    sif::warning << "SdCardManager::updateSdCardStateFile: system call failed with code " <<
            result << std::endl;
    return HasReturnvaluesIF::RETURN_FAILED;
}