#include <string>
#include <experimental/filesystem>
#include <stdlib.h>
#include <cstring>
#include <stdio.h>
#include <unistd.h>
#include <algorithm>
#include <sys/wait.h>
#include <sys/stat.h>
#include <phosphor-logging/log.hpp>
#include <phosphor-logging/elog.hpp>
#include <elog-errors.hpp>
#include <xyz/openbmc_project/Software/Version/error.hpp>
#include "config.h"
#include "version.hpp"
#include "watch.hpp"
#include "image_manager.hpp"

namespace phosphor
{
namespace software
{
namespace manager
{

using namespace phosphor::logging;
using namespace sdbusplus::xyz::openbmc_project::Software::Version::Error;
namespace fs = std::experimental::filesystem;

struct RemovablePath
{
    fs::path path;

    RemovablePath(const fs::path& path) : path(path) {}
    ~RemovablePath()
    {
        fs::remove_all(path);
    }
};

int Manager::processImage(const std::string& tarFilePath)
{
    if (!fs::is_regular_file(tarFilePath))
    {
        log<level::ERR>("Error tarball does not exist",
                        entry("FILENAME=%s", tarFilePath));
        report<ManifestFileFailure>(xyz::openbmc_project::Software::Version::
                                    ManifestFileFailure::PATH(
                                        tarFilePath.c_str()));
        return -1;

    }
    RemovablePath tarPathRemove(tarFilePath);
    fs::path tmpDirPath(std::string{IMG_UPLOAD_DIR});
    tmpDirPath /= "imageXXXXXX";

    // Need tmp dir to write MANIFEST file to.
    if (!mkdtemp(const_cast<char*>(tmpDirPath.c_str())))
    {
        log<level::ERR>("Error occured during mkdtemp",
                        entry("ERRNO=%d", errno));
        report<InternalFailure>(xyz::openbmc_project::Software::Version::
                                InternalFailure::FAIL("mkdtemp"));
        return -1;
    }

    RemovablePath tmpDirRemove(tmpDirPath);
    fs::path manifestPath = tmpDirPath;
    manifestPath /= MANIFEST_FILE_NAME;
    int status = 0;
    pid_t pid = fork();

    // Get the MANIFEST FILE
    if (pid == 0)
    {
        // child process
        execl("/bin/tar", "tar", "-xf", tarFilePath.c_str(), MANIFEST_FILE_NAME,
              "-C", tmpDirPath.c_str(), (char*)0);
        // execl only returns on fail
        log<level::ERR>("Failed to untar file",
                        entry("FILENAME=%s", tarFilePath));
        report<ManifestFileFailure>(xyz::openbmc_project::Software::Version::
                                    ManifestFileFailure::PATH(
                                        manifestPath.c_str()));
        return -1;
    }
    else if (pid > 0)
    {
        waitpid(pid, &status, 0);
    }
    else
    {
        log<level::ERR>("fork() failed.");
        report<InternalFailure>(xyz::openbmc_project::Software::Version::
                                InternalFailure::FAIL("fork"));
        return -1;
    }

    // Verify the manifest file
    if (!fs::is_regular_file(manifestPath))
    {
        log<level::ERR>("Error No manifest file");
        report<ManifestFileFailure>(xyz::openbmc_project::Software::Version::
                                    ManifestFileFailure::PATH(
                                        manifestPath.c_str()));
        return -1;
    }

    // Get version
    auto version = Version::getValue(manifestPath.string(), "version");
    if (version.empty())
    {
        log<level::ERR>("Error unable to read version from manifest file");
        report<ManifestFileFailure>(xyz::openbmc_project::Software::Version::
                                    ManifestFileFailure::PATH(
                                        manifestPath.c_str()));
        return -1;
    }

    // Get purpose
    auto purposeString = Version::getValue(manifestPath.string(), "purpose");
    if (purposeString.empty())
    {
        log<level::ERR>("Error unable to read purpose from manifest file");
        report<ManifestFileFailure>(xyz::openbmc_project::Software::Version::
                                    ManifestFileFailure::PATH(
                                        manifestPath.c_str()));
        return -1;
    }

    auto purpose = Version::VersionPurpose::Unknown;
    try {
        purpose = Version::convertVersionPurposeFromString(purposeString);
    } catch (const sdbusplus::exception::InvalidEnumString& e) {
        log<level::ERR>("Error: Failed to convert manifest purpose to enum. Setting to Unknown.");
    }

    // Compute id
    auto id = Version::getId(version);

    fs::path imageDirPath = std::string{IMG_UPLOAD_DIR};
    imageDirPath /= id;

    if (fs::exists(imageDirPath))
    {
        fs::remove_all(imageDirPath);
    }
    if (mkdir(imageDirPath.c_str(), S_IRWXU) != 0)
    {
        log<level::ERR>("Error occured during mkdir",
                        entry("ERRNO=%d", errno));
        report<InternalFailure>(xyz::openbmc_project::Software::Version::
                                InternalFailure::FAIL("mkdir"));
        return -1;
    }

    // Untar tarball
    auto rc = unTar(tarFilePath, imageDirPath.string());
    if (rc < 0)
    {
        log<level::ERR>("Error occured during untar");
        return -1;
    }

    // Create Version object
    auto objPath =  std::string{SOFTWARE_OBJPATH} + '/' + id;

    this->versions.insert(std::make_pair(
                              id,
                              std::make_unique<Version>(
                                  this->bus,
                                  objPath,
                                  version,
                                  purpose,
                                  imageDirPath.string())));

    return 0;
}

void Manager::erase(std::string entryId)
{
    auto it = versions.find(entryId);
    if (it == versions.end())
    {
        return;
    }

    if (it->second->isFunctional())
    {
        log<level::ERR>(("Error: Version " + entryId + \
                         " is currently running on the BMC." \
                         " Unable to remove.").c_str());
        return;
    }

    // Delete image dir
    fs::path imageDirPath = (*(it->second)).path();
    if (fs::exists(imageDirPath))
    {
        fs::remove_all(imageDirPath);
    }
    this->versions.erase(entryId);
}

void Manager::removeVersion(sdbusplus::message::message& msg)
{
    namespace mesg = sdbusplus::message;

    mesg::object_path objPath;

    msg.read(objPath);
    std::string path(std::move(objPath));

    // Version id is the last item in the path
    auto pos = path.rfind("/");
    if (pos == std::string::npos)
    {
        log<level::INFO>("No version id found in object path",
                        entry("OBJPATH=%s", path));
        return;
    }

    auto versionId = path.substr(pos + 1);

    erase(versionId);
}

int Manager::unTar(const std::string& tarFilePath,
                   const std::string& extractDirPath)
{
    if (tarFilePath.empty())
    {
        log<level::ERR>("Error TarFilePath is empty");
        report<UnTarFailure>(xyz::openbmc_project::Software::Version::
                             UnTarFailure::PATH(tarFilePath.c_str()));
        return -1;
    }
    if (extractDirPath.empty())
    {
        log<level::ERR>("Error ExtractDirPath is empty");
        report<UnTarFailure>(xyz::openbmc_project::Software::Version::
                             UnTarFailure::PATH(tarFilePath.c_str()));
        return -1;
    }

    log<level::INFO>("Untaring",
                     entry("FILENAME=%s", tarFilePath),
                     entry("EXTRACTIONDIR=%s", extractDirPath));
    int status = 0;
    pid_t pid = fork();

    if (pid == 0)
    {
        // child process
        execl("/bin/tar", "tar", "-xf", tarFilePath.c_str(),
              "-C", extractDirPath.c_str(), (char*)0);
        // execl only returns on fail
        log<level::ERR>("Failed to untar file",
                        entry("FILENAME=%s", tarFilePath));
        report<UnTarFailure>(xyz::openbmc_project::Software::Version::
                             UnTarFailure::PATH(tarFilePath.c_str()));
        return -1;
    }
    else if (pid > 0)
    {
        waitpid(pid, &status, 0);
    }
    else
    {
        log<level::ERR>("fork() failed.");
        report<UnTarFailure>(xyz::openbmc_project::Software::Version::
                             UnTarFailure::PATH(tarFilePath.c_str()));
        return -1;
    }

    return 0;
}

} // namespace manager
} // namespace software
} // namepsace phosphor