#include <QtGlobal>
#include <QCoreApplication>
#include <QByteArray>

#include <QProcess>
#include <QCommandLineParser>
#include <QStandardPaths>
#include <QSettings>
#include <QDir>
#include <QDebug>
#include <QDateTime>

#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonValue>
#include <QRegularExpression>
#include <QFile>
#include <QTextStream>
#include <QRegularExpression>

#include <optional>

#include "message_handler.h"
#include "utils_internal.h"
#include "git_command.h"
#include "commandline_parser.h"

int main(int argc, char **argv) {
    QByteArray const value = qgetenv("LC_ALL");
    if (value.isEmpty() || value != "C") {
        qputenv("LC_ALL", "C");
    }

    openlog("ATB-UPDATE-GIT", LOG_PERROR | LOG_PID | LOG_CONS, LOG_USER);

    QCoreApplication a(argc, argv);
    QCoreApplication::setApplicationName("ATBUpdateGit");
    QCoreApplication::setApplicationVersion(APP_VERSION);

    if (!messageHandlerInstalled()) { // change internal qt-QDebug-handling
        atbInstallMessageHandler(nullptr);
        //atbInstallMessageHandler(atbDebugOutput);
        setDebugLevel(LOG_NOTICE);
    }

    CommandLineParser parser;
    parser.setApplicationDescription("git-commands for the update-system");

    QCommandLineOption const checkCustomerRepositoryOption{"check"};
    QCommandLineOption const cloneCustomerRepositoryOption{"clone"};
    QCommandLineOption const pullBranchOption{"pull"};
    QCommandLineOption const checkoutBranchOption("checkout");

    parser.addOption(checkCustomerRepositoryOption);
    parser.addOption(cloneCustomerRepositoryOption);
    parser.addOption(pullBranchOption);
    parser.addOption(checkoutBranchOption);

    QCommandLineOption verboseOption{parser.addVersionOption()};
    parser.process(a);
    parser.readSettings();

#if 0
    // note: also used in initEnv().

    QString repositoryUrl = parser.repositoryUrl();

    if (repositoryUrl.endsWith('/')) {
        repositoryUrl.chop(1);
    }

    if (!repositoryUrl.isEmpty()) {
        qInfo() << "customer repository url" << repositoryUrl;
    } else {
        qCritical() << "ERROR customer repository url empty. git commands might fail.";
    }

    if (repositoryUrl.contains("ptu-config.atb-comm.de")) {
        QString gitSSHCommand("");
        QByteArray const v = qgetenv("GIT_SSH_COMMAND");
        if (v.isEmpty()) {
            QString sshKeyFile("/opt/app/tools/atbupdate/.keys/id_ed25519_ptuConfig");
            if (QFileInfo(sshKeyFile).exists()) {
                if (qgetenv("GIT_SSH_COMMAND").isNull()) {
                    gitSSHCommand = "ssh -i /opt/app/tools/atbupdate/.keys/id_ed25519_ptuConfig";
                    if (!qputenv("GIT_SSH_COMMAND", QByteArray(gitSSHCommand.toStdString().c_str()))) {
                        qCritical() << "ERROR: GIT_SSH_COMMAND not put into env. Exiting...";
                        return -1;
                    }
                }
            } else {
                qCritical() << "ERROR ssh-key-file" << sshKeyFile << "does not exists. Exiting...";
                return -1;
            }
        } else {
            gitSSHCommand = QString(v.toStdString().c_str());
            qInfo() << "GIT_SSH_COMMAND already set in enviroment:" << gitSSHCommand;
            if (gitSSHCommand != "ssh -i /opt/app/tools/atbupdate/.keys/id_ed25519_ptuConfig") {
                qCritical() << "ERROR" << gitSSHCommand << "wrong. Exiting...";
                return -1;
            }
        }

        if (!gitSSHCommand.isEmpty()) {
            qInfo() << "GIT_SSH_COMMAND .........." << gitSSHCommand;
        }
    }
#endif

    if (parser.isSet(verboseOption)) {
        parser.showVersion();
        return 0;
    }

    GitCommand gitCmd;

    if (parser.isSet(checkCustomerRepositoryOption)) {
        if (!gitCmd.check()) {
            return -1;
        }
    } else
    if (parser.isSet(checkoutBranchOption)) {
        if (!gitCmd.checkout()) {
            return -2;
        }
    } else
    if (parser.isSet(cloneCustomerRepositoryOption)) {
        if (!gitCmd.clone()) {
            return -3;
        }
    } else
    if (parser.isSet(pullBranchOption)) {
        if (!gitCmd.pull()) {
            return -4;
        }
    } else {
        if (internal::customerRepoExists()) {
            if (!gitCmd.checkout()) {
                return -2;
            }
            if (!gitCmd.pull()) {
                return -4;
            }
            QString const result = gitCmd.commandResult().trimmed();
            if (result.contains("Already", Qt::CaseInsensitive)
             && result.contains("up", Qt::CaseInsensitive)
             && result.contains("to", Qt::CaseInsensitive)
             && result.contains("date", Qt::CaseInsensitive)) {
                qCritical() << internal::GIT_CUSTOMER_REPO_NO_UPDATE_NECESSARY;
                return internal::GIT_NOT_NECESSARY_CODE;
            } else
            if (result.contains(QRegularExpression("[Uu]pdating\\s+[a-z0-9]{6,}\\.\\.[a-z0-9]{6,}"))) {
                // Updating 49a97f5..13a0321
                qCritical() << internal::GIT_CUSTOMER_REPO_UPDATED;
                return internal::GIT_UPDATED_CODE;
            }
        } else {
            if (!gitCmd.clone()) {
                return -3;
            }
            if (!gitCmd.checkout()) {
                return -2;
            }
            qCritical() << internal::GIT_CUSTOMER_REPO_CLONED;
            return internal::GIT_CLONED_CODE;
        }
    }

    return 0;
}