/*
 * This file is part of smolbote. It's copyrighted by the contributors recorded
 * in the version control history of the file, available from its original
 * location: https://neueland.iserlohn-fortress.net/gitea/aqua/smolbote
 *
 * SPDX-License-Identifier: GPL-3.0
 */

#include "browser.h"
#include "configuration.h"
#include "session.h"
#include "util.h"
#include <QFile>
#include <QLibraryInfo>
#include <QPluginLoader>
#include <QTranslator>
#include <QVersionNumber>
#include <iostream>
#include <memory>
#include <plugininterface.h>
#include <version.h>
#ifdef _WIN32
#include <cstdio>
#include <windows.h>
#endif

#include "config.h"
#if defined(CONFIG_USEPLASMA) && !defined(PLASMA)
#error "You have enabled Plasma integration, but Frameworks was not found."
#endif

#if defined(CONFIG_USEBREAKPAD) && !defined(BREAKPAD)
#error "You have enabled Breakpad integration, but Breakpad was not found."
#endif

#ifdef CONFIG_USEBREAKPAD

struct BreakpadContext {
    char *handler = nullptr;
};

#ifdef Q_OS_LINUX
#include <client/linux/handler/exception_handler.h>
#include <unistd.h>

// bool filter_callback (void*)
// --> true: continue processing and write a minidump

static bool dumpCallback(const google_breakpad::MinidumpDescriptor &descriptor, void *context, bool succeeded)
{
    printf("Dump path: %s\n", descriptor.path());

    auto *ctx = static_cast<BreakpadContext *>(context);
    if(ctx != nullptr) {
        if(ctx->handler != nullptr) {
            // fork and run 'handler master:commit path.dmp'
            pid_t pid = fork();
            if(pid == 0) {
                char buffer[256];
                snprintf(buffer, 256, "%s %s %s", ctx->handler, poi_Build, descriptor.path());
                execlp("/bin/sh", "/bin/sh", "-c", buffer, (char *)nullptr);
            }
        }
    }

    return succeeded;
}
#endif // Q_OS_LINUX
#endif // CONFIG_USEBREAKPAD

int main(int argc, char **argv)
{
    // a beautiful hack to be able to write to stdout on Windows
#ifdef _WIN32
    if(AttachConsole(ATTACH_PARENT_PROCESS)) {
        freopen("CONOUT$", "w", stdout);
        freopen("CONOUT$", "w", stderr);
    }
#endif

    // Disable Chromium's crash handler so breakpad can capture crashes instead.
    // This has to be done before QtWebEngine gets initialized.
    const auto chromiumFlags = qgetenv("QTWEBENGINE_CHROMIUM_FLAGS");
    if(!chromiumFlags.contains("disable-in-process-stack-traces")) {
        qputenv("QTWEBENGINE_CHROMIUM_FLAGS", chromiumFlags + " --disable-in-process-stack-traces");
    }

    // create and load configuration
    std::unique_ptr<Configuration> config = std::make_unique<Configuration>(nullptr);
#ifdef QT_DEBUG
    QObject::connect(config.get(), &Configuration::settingChanged, [](const std::string &path, const QString &value) {
        qDebug("!!! setting changed %s=[%s]", path.c_str(), qUtf8Printable(value));
    });
#endif

    if(!config->parse(argc, argv)) {
        qWarning("Error parsing command line, check --help for usage.");
        return -1;
    }
    if(!config->parse(config->value<std::string>("config").value())) {
        qWarning("Error parsing config file.");
    }

    // --version
    if(config->exists("version")) {
        auto ver = QVersionNumber::fromString(QLatin1String(poi_Version));
        std::cout << "smolbote " << ver.toString().toStdString() << std::endl;
        return 0;
    }

    // --build
    if(config->exists("build")) {
        std::cout << poi_Version << std::endl;
        return 0;
    }

    QVector<QPluginLoader *> plugins;
    CommandHash_t pluginCommands;

    // Load plugins
    for(const QString &path : Util::files(config->value<QString>("plugins.path").value())) {
        QPluginLoader *loader = new QPluginLoader(path);
        const bool loaded = loader->load();
#ifdef QT_DEBUG
        qDebug("Loading plugin %s %s", qUtf8Printable(path), loaded ? "[ok]" : "[failed]");
#endif

        if(loaded) {
            plugins.append(loader);
            auto *plugin = qobject_cast<PluginInterface *>(loader->instance());
            pluginCommands.unite(plugin->commands());
        } else {
            qDebug("%s", qUtf8Printable(loader->errorString()));
            delete loader;
        }
    }

    if(config->exists("help")) {
        std::cout << "smolbote " << poi_Version << ": yet another no-frills browser" << std::endl;
        std::cout << "Usage: " << argv[0] << " [options] [command/URL(s)]" << std::endl
                  << std::endl;

        std::cout << "Command-line Options: " << std::endl
                  << config->commandlineOptions() << std::endl;

        std::cout << "Commands: " << std::endl;
        for(auto it = pluginCommands.constBegin(); it != pluginCommands.constEnd(); ++it) {
            std::cout << it.key().toStdString() << std::endl;
        }
        std::cout << std::endl;

        std::cout << "Configuration Options: " << std::endl
                  << config->configurationOptions() << std::endl;

#ifdef Q_OS_LINUX
        std::cout << std::endl
                  << "For more information refer to the manual page smolbote.7" << std::endl;
#endif
        return 0;
    }

    // argc, argv, allowSecondary
    Browser app(argc, argv);
    // set this, otherwise the webview becomes black when using a stylesheet
    app.setAttribute(Qt::AA_DontCreateNativeWidgetSiblings, true);

#ifdef CONFIG_USEBREAKPAD
    const std::string crashpath = config->value<std::string>("browser.crash.path").value_or("/tmp");
    assert(!crashpath.empty());

    BreakpadContext ctx;
    google_breakpad::MinidumpDescriptor descriptor(crashpath.c_str());

    const auto crashHandler = config->value<std::string>("browser.crash.handler");
    if(crashHandler) {
        const int length = crashHandler.value().length() + 1;
        ctx.handler = new char[length];
        crashHandler.value().copy(ctx.handler, length - 1);
        ctx.handler[length - 1] = '\0';
    }

    // minidump descriptor, filter callback, minidump callback, callback_context, install handler, server_fd
    google_breakpad::ExceptionHandler eh(descriptor, nullptr, dumpCallback, &ctx, true, -1);

#ifdef QT_DEBUG
    qDebug("Installed breakpad exception handler (path=%s)", crashpath.c_str());
#endif
#endif // CONFIG_USEBREAKPAD

    // translator
    if(config->exists("browser.locale")) {
        auto *translator = new QTranslator(&app);
        if(translator->load("qt_" + config->value<QString>("browser.locale").value(), QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
            app.installTranslator(translator);
        else
            delete translator;
    }

    if(config->exists("browser.translation")) {
        auto *translator = new QTranslator(&app);
        if(translator->load(config->value<QString>("browser.translation").value()))
            app.installTranslator(translator);
        else
            delete translator;
    }

    // command line arguments
    bool isStandalone = config->exists("no-remote");
    auto arguments = config->value<std::vector<std::string>>("args");
    auto session = config->value<QString>("browser.session");
    auto profile = config->value<QString>("profile.default");

    app.setConfiguration(config);
    app.setup(plugins);

    QStringList urls;
    if(arguments) {
        for(const auto &u : arguments.value()) {
            if(pluginCommands.contains(QString::fromStdString(u))) {
                return pluginCommands.value(QString::fromStdString(u))();
            } else {
                urls.append(QString::fromStdString(u));
            }
        }
    }

    // if app is primary, create new sessions from received messages
    if(app.isPrimary() && !isStandalone) {
        QObject::connect(&app, &Browser::receivedMessage, &app, [&app](quint32 instanceId, QByteArray message) {
            Q_UNUSED(instanceId);
            auto doc = QJsonDocument::fromJson(message);
            app.createSession(doc.object());
        });
    }

    {
        QJsonObject sessionData;
        if(session) {
            QFile sessionJson(session.value());
            if(sessionJson.open(QIODevice::ReadOnly | QIODevice::Text)) {
                sessionData = QJsonDocument::fromJson(sessionJson.readAll()).object();
                sessionJson.close();
            }
        } else {
            sessionData = Session::window(profile.value(), urls);
        }

        if(app.isPrimary() || isStandalone) {
            app.createSession(sessionData);
        } else {
            // app is secondary and not standalone
            return app.sendMessage(QJsonDocument(sessionData).toJson());
        }
    }

    return app.exec();
}