/*
 * Cppcheck - A tool for static C/C++ code analysis
 * Copyright (C) 2007-2020 Cppcheck team.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include <QFileInfo>
#include <QObject>
#include <QSettings>
#include <QStringList>

#include "common.h"
#include "applicationlist.h"
#include "application.h"

#include <cstdlib>

ApplicationList::ApplicationList(QObject *parent) :
 QObject(parent),
 mDefaultApplicationIndex(-1)
{
 //ctor
}

ApplicationList::~ApplicationList()
{
 clear();
}

bool ApplicationList::loadSettings()
{
 QSettings settings;
 QStringList names = settings.value(SETTINGS_APPLICATION_NAMES, QStringList()).toStringList();
 QStringList paths = settings.value(SETTINGS_APPLICATION_PATHS, QStringList()).toStringList();
 QStringList params = settings.value(SETTINGS_APPLICATION_PARAMS, QStringList()).toStringList();
 int defapp = settings.value(SETTINGS_APPLICATION_DEFAULT, -1).toInt();

 // Params will be empty first time starting with the new setting.
 // Return false and inform user about problem with application settings.
 bool succeeded = true;
 if (!names.empty() && !paths.empty() && params.empty()) {
 for (int i = 0; i < paths.length(); i++)
 params << QString();
 succeeded = false;
 }

 if (names.empty() && paths.empty() && params.empty()) {
#ifndef _WIN32
 // use as default for gnome environments
 if (QFileInfo("/usr/bin/gedit").isExecutable()) {
 Application app;
 app.setName("gedit");
 app.setPath("/usr/bin/gedit");
 app.setParameters("+(line) (file)");
 addApplication(app);
 defapp = 0;
 }
 checkAndAddApplication("/usr/bin/geany","geany","+(line) (file)");
 checkAndAddApplication("/usr/bin/qtcreator","Qt Creator","-client (file):(line)");
 // use as default for kde environments
 if (QFileInfo("/usr/bin/kate").isExecutable()) {
 Application app;
 app.setName("kate");
 app.setPath("/usr/bin/kate");
 app.setParameters("-l(line) (file)");
 addApplication(app);
 defapp = 0;
 }
#else
 if (findDefaultWindowsEditor()) {
 defapp = 0;
 }
#endif
 } else if (names.size() == paths.size()) {
 for (int i = 0; i < names.size(); i++) {
 const Application app(names[i], paths[i], params[i]);
 addApplication(app);
 }
 }

 if (defapp == -1)
 mDefaultApplicationIndex = 0;
 else if (defapp < names.size())
 mDefaultApplicationIndex = defapp;
 else
 mDefaultApplicationIndex = 0;

 return succeeded;
}

void ApplicationList::saveSettings() const
{
 QSettings settings;
 QStringList names;
 QStringList paths;
 QStringList params;

 for (int i = 0; i < getApplicationCount(); i++) {
 const Application& app = getApplication(i);
 names << app.getName();
 paths << app.getPath();
 params << app.getParameters();
 }

 settings.setValue(SETTINGS_APPLICATION_NAMES, names);
 settings.setValue(SETTINGS_APPLICATION_PATHS, paths);
 settings.setValue(SETTINGS_APPLICATION_PARAMS, params);
 settings.setValue(SETTINGS_APPLICATION_DEFAULT, mDefaultApplicationIndex);
}

int ApplicationList::getApplicationCount() const
{
 return mApplications.size();
}

Application& ApplicationList::getApplication(const int index)
{
 if (index >= 0 && index < mApplications.size()) {
 return mApplications[index];
 }

 static Application dummy; // TODO: Throw exception instead?
 return dummy;
}

const Application& ApplicationList::getApplication(const int index) const
{
 if (index >= 0 && index < mApplications.size()) {
 return mApplications[index];
 }

 static const Application dummy; // TODO: Throw exception instead?
 return dummy;
}

void ApplicationList::addApplication(const Application &app)
{
 if (app.getName().isEmpty() || app.getPath().isEmpty()) {
 return;
 }
 mApplications << app;
}

void ApplicationList::removeApplication(const int index)
{
 mApplications.removeAt(index);
}

void ApplicationList::setDefault(const int index)
{
 if (index < mApplications.size() && index >= 0) {
 mDefaultApplicationIndex = index;
 }
}

void ApplicationList::copy(const ApplicationList *list)
{
 if (!list) {
 return;
 }

 clear();
 for (int i = 0; i < list->getApplicationCount(); i++) {
 const Application& app = list->getApplication(i);
 addApplication(app);
 }
 mDefaultApplicationIndex = list->getDefaultApplication();
}

void ApplicationList::clear()
{
 mApplications.clear();
 mDefaultApplicationIndex = -1;
}

bool ApplicationList::checkAndAddApplication(const QString& appPath, const QString& name, const QString& parameters)
{
 if (QFileInfo(appPath).exists() && QFileInfo(appPath).isExecutable()) {
 Application app;
 app.setName(name);
 app.setPath("\"" + appPath + "\"");
 app.setParameters(parameters);
 addApplication(app);
 return true;
 }
 return false;
}

bool ApplicationList::findDefaultWindowsEditor()
{
 bool foundOne = false;
#ifdef WIN64 // As long as we do support 32-bit XP, we cannot be sure that the environment variable "ProgramFiles(x86)" exists
 const QString appPathx86(getenv("ProgramFiles(x86)"));
#else
 const QString appPathx86(getenv("ProgramFiles"));
#endif
 const QString appPathx64(getenv("ProgramW6432"));
 const QString windowsPath(getenv("windir"));

 if (checkAndAddApplication(appPathx86 + "\\Notepad++\\notepad++.exe", "Notepad++", "-n(line) (file)"))
 foundOne = true;
 else if (checkAndAddApplication(appPathx64 + "\\Notepad++\\notepad++.exe", "Notepad++", "-n(line) (file)"))
 foundOne = true;

 if (checkAndAddApplication(appPathx86 + "\\Notepad2\\Notepad2.exe", "Notepad2", "/g (line) (file)"))
 foundOne = true;
 else if (checkAndAddApplication(appPathx64 + "\\Notepad2\\Notepad2.exe", "Notepad2", "/g (line) (file)"))
 foundOne = true;

 if (checkAndAddApplication(windowsPath + "\\system32\\notepad.exe", "Notepad", "(file)"))
 foundOne = true;

 QString regPath = "HKEY_CLASSES_ROOT\\Applications\\QtProject.QtCreator.pro\\shell\\Open\\command";
 QSettings registry(regPath, QSettings::NativeFormat);
 QString qtCreatorRegistry = registry.value("Default", QString()).toString();
 QString qtCreatorPath = qtCreatorRegistry.left(qtCreatorRegistry.indexOf(".exe") + 4);
 if (!qtCreatorRegistry.isEmpty() && checkAndAddApplication(qtCreatorPath, "Qt Creator", "-client (file):(line)")) {
 foundOne = true;
 }

 const QString regPathUEdit32 = "HKEY_CLASSES_ROOT\\Applications\\Uedit32.exe\\shell\\open\\Command";
 const QSettings registryUEdit32(regPathUEdit32, QSettings::NativeFormat);
 const QString uedit32Registry = registryUEdit32.value("Default", QString()).toString();
 if (!uedit32Registry.isEmpty()) {
 // Extract path to executable and make sure there is no single quotation mark at the beginning
 const QString uedit32Path = uedit32Registry.left(uedit32Registry.indexOf(".exe") + 4).replace("\"", "");
 if (checkAndAddApplication(uedit32Path, "UltraEdit 32", "(file)/(line)")) {
 foundOne = true;
 }
 }

 const QString regPathUEdit64 = "HKEY_CLASSES_ROOT\\Applications\\uedit64.exe\\shell\\open\\Command";
 const QSettings registryUEdit64(regPathUEdit64, QSettings::NativeFormat);
 const QString uedit64Registry = registryUEdit64.value("Default", QString()).toString();
 if (!uedit64Registry.isEmpty()) {
 // Extract path to executable and make sure there is no single quotation mark at the beginning
 const QString uedit64Path = uedit64Registry.left(uedit64Registry.indexOf(".exe") + 4).replace("\"", "");
 if (checkAndAddApplication(uedit64Path, "UltraEdit 64", "(file)/(line)")) {
 foundOne = true;
 }
 }

 const QString regPathMSVSCode = "HKEY_CLASSES_ROOT\\Applications\\Code.exe\\shell\\open\\command";
 const QSettings registryMSVSCode(regPathMSVSCode, QSettings::NativeFormat);
 const QString msvscodeRegistry = registryMSVSCode.value("Default", QString()).toString();
 if (!msvscodeRegistry.isEmpty()) {
 const QString msvscodePath = msvscodeRegistry.left(msvscodeRegistry.indexOf(".exe") + 4).replace("\"", "");
 if (checkAndAddApplication(msvscodePath, "Microsoft VS Code", "-g (file):(line)")) {
 foundOne = true;
 }
 }

 return foundOne;
}