/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
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** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
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**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
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****************************************************************************/

#include "gerritparameters.h"
#include "gerritplugin.h"

#include <utils/hostosinfo.h>
#include <utils/pathchooser.h>

#include <QDebug>
#include <QFileInfo>
#include <QRegularExpression>
#include <QSettings>
#include <QStandardPaths>

using namespace Utils;

namespace Gerrit {
namespace Internal {

static const char settingsGroupC[] = "Gerrit";
static const char hostKeyC[] = "Host";
static const char userKeyC[] = "User";
static const char portKeyC[] = "Port";
static const char portFlagKeyC[] = "PortFlag";
static const char sshKeyC[] = "Ssh";
static const char curlKeyC[] = "Curl";
static const char httpsKeyC[] = "Https";
static const char defaultHostC[] = "codereview.qt-project.org";
static const char savedQueriesKeyC[] = "SavedQueries";

static const char defaultPortFlag[] = "-p";

enum { defaultPort = 29418 };

static inline QString detectApp(const char *defaultExe)
{
    const QString defaultApp = HostOsInfo::withExecutableSuffix(QLatin1String(defaultExe));
    QString app = QStandardPaths::findExecutable(defaultApp);
    if (!app.isEmpty())
        return app;
    if (HostOsInfo::isWindowsHost()) { // Windows: Use app.exe from git if it cannot be found.
        FileName path = GerritPlugin::gitBinDirectory();
        if (!path.isEmpty())
            app = path.appendPath(defaultApp).toString();
    }
    return app;
}

static inline QString detectSsh()
{
    const QByteArray gitSsh = qgetenv("GIT_SSH");
    if (!gitSsh.isEmpty())
        return QString::fromLocal8Bit(gitSsh);
    return detectApp("ssh");
}

GerritServer::GerritServer()
    : host(defaultHostC)
    , port(defaultPort)
{
}

GerritServer::GerritServer(const QString &host, unsigned short port,
                           const QString &user, HostType type)
    : host(host)
    , user(user)
    , port(port)
    , type(type)
{}

bool GerritServer::operator==(const GerritServer &other) const
{
    if (port && other.port && port != other.port)
        return false;
    return host == other.host && user == other.user && type == other.type;
}

void GerritParameters::setPortFlagBySshType()
{
    bool isPlink = false;
    if (!ssh.isEmpty()) {
        const QString version = PathChooser::toolVersion(ssh, {"-V"});
        isPlink = version.contains("plink", Qt::CaseInsensitive);
    }
    portFlag = QLatin1String(isPlink ? "-P" : defaultPortFlag);
}

GerritParameters::GerritParameters()
    : https(true)
    , portFlag(defaultPortFlag)
{
}

QString GerritServer::sshHostArgument() const
{
    return user.isEmpty() ? host : (user + '@' + host);
}

QString GerritServer::url() const
{
    QString res = "ssh://" + sshHostArgument();
    if (port)
        res += ':' + QString::number(port);
    return res;
}

bool GerritServer::fillFromRemote(const QString &remote, const QString &defaultUser)
{
    static const QRegularExpression remotePattern(
                "^(?:(?<protocol>[^:]+)://)?(?:(?<user>[^@]+)@)?(?<host>[^:/]+)(?::(?<port>\\d+))?");

    // Skip local remotes (refer to the root or relative path)
    if (remote.isEmpty() || remote.startsWith('/') || remote.startsWith('.'))
        return false;
    // On Windows, local paths typically starts with <drive>:
    if (HostOsInfo::isWindowsHost() && remote[1] == ':')
        return false;
    QRegularExpressionMatch match = remotePattern.match(remote);
    if (!match.hasMatch())
        return false;
    const QString protocol = match.captured("protocol");
    if (protocol == "https")
        type = GerritServer::Https;
    else if (protocol == "http")
        type = GerritServer::Http;
    else if (protocol.isEmpty() || protocol == "ssh")
        type = GerritServer::Ssh;
    else
        return false;
    const QString userName = match.captured("user");
    user = userName.isEmpty() ? defaultUser : userName;
    host = match.captured("host");
    port = match.captured("port").toUShort();
    if (host.contains("github.com")) // Clearly not gerrit
        return false;
    return true;
}

bool GerritParameters::equals(const GerritParameters &rhs) const
{
    return server == rhs.server && ssh == rhs.ssh && curl == rhs.curl && https == rhs.https;
}

void GerritParameters::toSettings(QSettings *s) const
{
    s->beginGroup(settingsGroupC);
    s->setValue(hostKeyC, server.host);
    s->setValue(userKeyC, server.user);
    s->setValue(portKeyC, server.port);
    s->setValue(portFlagKeyC, portFlag);
    s->setValue(sshKeyC, ssh);
    s->setValue(curlKeyC, curl);
    s->setValue(httpsKeyC, https);
    s->endGroup();
}

void GerritParameters::saveQueries(QSettings *s) const
{
    s->beginGroup(settingsGroupC);
    s->setValue(savedQueriesKeyC, savedQueries.join(','));
    s->endGroup();
}

void GerritParameters::fromSettings(const QSettings *s)
{
    const QString rootKey = QLatin1String(settingsGroupC) + '/';
    server.host = s->value(rootKey + hostKeyC, defaultHostC).toString();
    server.user = s->value(rootKey + userKeyC, QString()).toString();
    ssh = s->value(rootKey + sshKeyC, QString()).toString();
    curl = s->value(rootKey + curlKeyC).toString();
    server.port = s->value(rootKey + portKeyC, QVariant(int(defaultPort))).toInt();
    portFlag = s->value(rootKey + portFlagKeyC, defaultPortFlag).toString();
    savedQueries = s->value(rootKey + savedQueriesKeyC, QString()).toString()
            .split(',');
    https = s->value(rootKey + httpsKeyC, QVariant(true)).toBool();
    if (ssh.isEmpty() || !QFile::exists(ssh))
        ssh = detectSsh();
    if (curl.isEmpty() || !QFile::exists(curl))
        curl = detectApp("curl");
}

bool GerritParameters::isValid() const
{
    return !server.host.isEmpty() && !server.user.isEmpty() && !ssh.isEmpty();
}

} // namespace Internal
} // namespace Gerrit