// sentryIntegration.cxx - Interface with Sentry.io crash reporting
//
// Copyright (C) 2020 James Turner  james@flightgear.org
//
// 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 2 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, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

#include "config.h"

#include "sentryIntegration.hxx"

#include <cstring> // for strcmp

#include <simgear/debug/LogCallback.hxx>
#include <simgear/debug/logstream.hxx>
#include <simgear/debug/ErrorReportingCallback.hxx>
#include <simgear/misc/sg_path.hxx>
#include <simgear/props/props.hxx>
#include <simgear/structure/commands.hxx>
#include <simgear/structure/exception.hxx>
#include <simgear/io/iostreams/sgstream.hxx>

#include <Main/fg_init.hxx>
#include <Main/fg_props.hxx>
#include <Main/globals.hxx>

#include <flightgearBuildId.h>

using namespace std;

bool doesStringMatchPrefixes(const std::string& s, const std::initializer_list<const char*>& prefixes)
{
    if (s.empty())
        return false;


    for (auto c  : prefixes) {
        if (s.find(c) == 0)
            return true;
    }

    return false;
}

auto OSG_messageWhitelist = {
     "PNG lib warning : iCCP: known incorrect sRGB profile",
     "PNG lib warning : iCCP: profile 'ICC Profile': 1000000h: invalid rendering intent",
     "osgDB ac3d reader: detected surface with less than 3",
     "osgDB ac3d reader: detected line with less than 2",
     "Detected particle system using segment(s) with less than 2 vertices"
};

auto XML_messageWhitelist = {
    "Cannot open file",
    "not well-formed (invalid token)",
    "mismatched tag",
    "syntax error",
    "no element found",
    "Root element name is",
    "XML or text declaration not at start of entity",
    "Failed to open file",
    "unclosed token"};

auto exception_messageWhitelist = {
    "position is invalid, NaNs",    ///< avoid spam when NaNs occur
    "bad AI flight plan",           ///< adjusting logic to avoid this is tricky
    "couldn't find shader",         ///< handled seperately

    /// supress noise from user-entered METAR values : we special case
    /// when live metar fails to parse
    "metar data bogus",
    "metar data incomplete"
};

// we don't want sentry enabled for the test suite
#if defined(HAVE_SENTRY) && !defined(BUILDING_TESTSUITE)

static bool static_sentryEnabled = false;
thread_local bool perThread_reportXMLParseErrors = true;

#include <sentry.h>

namespace {

// this callback is invoked whenever an instance of sg_throwable is created.
// therefore we can log the stack trace at that point
void sentryTraceSimgearThrow(const std::string& msg, const std::string& origin, const sg_location& loc)
{
    if (!static_sentryEnabled)
        return;

// don't report the exceptions raised by easyxml.cxx, if this per-thread
// flag is set. This avoids a lot of errors when the launcher scans 
// directories containing many aircraft of unknown origin/quality
// if the user tries to fly with one, we'll still get an error then,
// but that's a real failure point (from the user PoV)
    if (!perThread_reportXMLParseErrors && doesStringMatchPrefixes(msg, XML_messageWhitelist)) {
        return;
    }

    if (doesStringMatchPrefixes(msg, exception_messageWhitelist)) {
        return;
    }

    sentry_value_t exc = sentry_value_new_object();
    sentry_value_set_by_key(exc, "type", sentry_value_new_string("Exception"));

    string message = msg;
    sentry_value_t info = sentry_value_new_object();
    if (!origin.empty()) {
        sentry_value_set_by_key(info, "origin", sentry_value_new_string(origin.c_str()));
    }

    if (loc.isValid()) {
        const auto ls = loc.asString();
        sentry_value_set_by_key(info, "location", sentry_value_new_string(ls.c_str()));
    }

    sentry_set_context("what", info);
    sentry_value_set_by_key(exc, "value", sentry_value_new_string(message.c_str()));

    sentry_value_t event = sentry_value_new_event();
    sentry_value_set_by_key(event, "exception", exc);

    sentry_event_value_add_stacktrace(event, nullptr, 0);
    sentry_capture_event(event);
}

class SentryLogCallback : public simgear::LogCallback
{
public:
    SentryLogCallback() : simgear::LogCallback(SG_ALL, SG_WARN)
    {
    }

    bool doProcessEntry(const simgear::LogEntry& e) override
    {
        // we need original priority here, so we don't record MANDATORY_INFO
        // or DEV_ messages, which would get noisy.
        const auto op = e.originalPriority;
        if ((op != SG_WARN) && (op != SG_ALERT)) {
            return true;
        }

        if ((e.debugClass == SG_OSG) && doesStringMatchPrefixes(e.message, OSG_messageWhitelist)) {
            return true;
        }

        if (e.message == _lastLoggedMessage) {
            _lastLoggedCount++;
            return true;
        }

        if (_lastLoggedCount > 0) {
            flightgear::addSentryBreadcrumb("(repeats " + std::to_string(_lastLoggedCount) + " times)", "info");
            _lastLoggedCount = 0;
        }

        _lastLoggedMessage = e.message;
        flightgear::addSentryBreadcrumb(e.message, (op == SG_WARN) ? "warning" : "error");
        return true;
    }

private:
    std::string _lastLoggedMessage;
    int _lastLoggedCount = 0;
};

const auto missingShaderPrefix = string{"Missing shader"};

string_list anon_missingShaderList;

bool isNewMissingShader(const std::string& path)
{
    auto it = std::find(anon_missingShaderList.begin(), anon_missingShaderList.end(), path);
    if (it != anon_missingShaderList.end()) {
        return false;
    }

    anon_missingShaderList.push_back(path);
    return true;
}

void sentrySimgearReportCallback(const string& msg, const string& more, bool isFatal)
{
    // don't duplicate reports for missing shaders, once per sessions
    // is sufficient
    using simgear::strutils::starts_with;
    if (starts_with(msg, missingShaderPrefix)) {
        if (!isNewMissingShader(more)) {
            return;
        }
    }

    sentry_value_t exc = sentry_value_new_object();
    if (isFatal) {
        sentry_value_set_by_key(exc, "type", sentry_value_new_string("Fatal Error"));
    } else {
        sentry_value_set_by_key(exc, "type", sentry_value_new_string("Exception"));
    }

    sentry_value_set_by_key(exc, "value", sentry_value_new_string(msg.c_str()));

    sentry_value_t event = sentry_value_new_event();
    sentry_value_set_by_key(event, "exception", exc);

    sentry_event_value_add_stacktrace(event, nullptr, 0);
    sentry_capture_event(event);
}

void sentryReportBadAlloc()
{
    sentry_value_t sentryMessage = sentry_value_new_object();
    sentry_value_set_by_key(sentryMessage, "type", sentry_value_new_string("Fatal Error"));
    sentry_value_set_by_key(sentryMessage, "formatted", sentry_value_new_string("bad allocation"));

    sentry_value_t event = sentry_value_new_event();
    sentry_value_set_by_key(event, "message", sentryMessage);

    sentry_event_value_add_stacktrace(event, nullptr, 0);
    sentry_capture_event(event);

    std::set_new_handler(nullptr);
}

} // namespace

namespace flightgear
{

bool sentryReportCommand(const SGPropertyNode* args, SGPropertyNode* root)
{
    if (!static_sentryEnabled) {
        SG_LOG(SG_GENERAL, SG_WARN, "Sentry.io not enabled at startup");
        return false;
    }

    sentry_value_t exc = sentry_value_new_object();
    sentry_value_set_by_key(exc, "type", sentry_value_new_string("Report"));

    const string message = args->getStringValue("message");
    sentry_value_set_by_key(exc, "value", sentry_value_new_string(message.c_str()));

    sentry_value_t event = sentry_value_new_event();
    sentry_value_set_by_key(event, "exception", exc);
    // capture the C++ stack-trace. Probably not that useful but can't hurt
    sentry_event_value_add_stacktrace(event, nullptr, 0);

    sentry_capture_event(event);

    return true;
}

bool sentrySendError(const SGPropertyNode* args, SGPropertyNode* root)
{
    if (!static_sentryEnabled) {
        SG_LOG(SG_GENERAL, SG_WARN, "Sentry.io not enabled at startup");
        return false;
    }

    try {
        throw sg_io_exception("Invalid flurlbe", sg_location("/Some/dummy/path/bar.txt", 100, 200));
    } catch (sg_exception& e) {
        SG_LOG(SG_GENERAL, SG_WARN, "caught dummy exception");
    }

    return true;
}


void initSentry()
{
    sentry_options_t *options = sentry_options_new();
    // API key is defined in config.h, set in an environment variable prior
    // to running CMake, so it can be customised. Env var at build time is:
    // FLIGHTGEAR_SENTRY_API_KEY
    sentry_options_set_dsn(options, SENTRY_API_KEY);
    
    if (strcmp(FG_BUILD_TYPE, "Dev") == 0) {
        sentry_options_set_release(options, "flightgear-dev@" FLIGHTGEAR_VERSION);
    } else {
        sentry_options_set_release(options, "flightgear@" FLIGHTGEAR_VERSION);
    }
    
    const auto buildString = std::to_string(JENKINS_BUILD_NUMBER);
    sentry_options_set_dist(options, buildString.c_str());
    
    SGPath dataPath = fgHomePath() / "sentry_db";
#if defined(SG_WINDOWS)
    const auto homePathString = dataPath.wstr();
    sentry_options_set_database_pathw(options, homePathString.c_str());
    
    const auto logPath = (fgHomePath() / "fgfs.log").wstr();
    sentry_options_add_attachmentw(options, logPath.c_str());
#else
    const auto homePathString = dataPath.utf8Str();
    sentry_options_set_database_path(options, homePathString.c_str());
    
    const auto logPath = (fgHomePath() / "fgfs.log").utf8Str();
    sentry_options_add_attachment(options, logPath.c_str());
#endif
    
    const auto uuidPath = fgHomePath() / "sentry_uuid.txt";
    bool generateUuid = true;
    std::string uuid;
    if (uuidPath.exists()) {
        sg_ifstream f(uuidPath);
        std::getline(f, uuid);
        // if we read enough bytes, that this is a valid UUID, then accept it
        if ( uuid.length() >= 36) {
            generateUuid = false;
        }
    }

    // we need to generate a new UUID
    if (generateUuid) {
        // use the Sentry APi to generate one
        sentry_uuid_t su = sentry_uuid_new_v4();
        char bytes[38];
        sentry_uuid_as_string(&su, bytes);
        bytes[37] = 0;

        uuid = std::string{bytes};
        // write it back to disk for next time
        sg_ofstream f(uuidPath);
        f << uuid << endl;
    }

    sentry_init(options);
    static_sentryEnabled = true;

    sentry_value_t user = sentry_value_new_object();
    sentry_value_t userUuidV = sentry_value_new_string(uuid.c_str());
    sentry_value_set_by_key(user, "id", userUuidV);
    sentry_set_user(user);

    sglog().addCallback(new SentryLogCallback);
    setThrowCallback(sentryTraceSimgearThrow);
    simgear::setErrorReportCallback(sentrySimgearReportCallback);

    std::set_new_handler(sentryReportBadAlloc);
}

void delayedSentryInit()
{
    if (!static_sentryEnabled)
        return;

    // allow the user to opt-out of sentry.io features
    if (!fgGetBool("/sim/startup/sentry-crash-reporting-enabled", true)) {
        SG_LOG(SG_GENERAL, SG_INFO, "Disabling Sentry.io reporting");
        sentry_shutdown();
        static_sentryEnabled = false;
        return;
    }

    globals->get_commands()->addCommand("sentry-report", &sentryReportCommand);
    globals->get_commands()->addCommand("sentry-exception", &sentrySendError);
}

void shutdownSentry()
{
    if (static_sentryEnabled) {
        sentry_shutdown();
        static_sentryEnabled = false;
    }
}

bool isSentryEnabled()
{
    return static_sentryEnabled;
}

void addSentryBreadcrumb(const std::string& msg, const std::string& level)
{
    if (!static_sentryEnabled)
        return;

    sentry_value_t crumb = sentry_value_new_breadcrumb("default", msg.c_str());
    sentry_value_set_by_key(crumb, "level", sentry_value_new_string(level.c_str()));
    sentry_add_breadcrumb(crumb);
}

void addSentryTag(const char* tag, const char* value)
{
    if (!static_sentryEnabled)
        return;

    if (!tag || !value)
        return;
    
    sentry_set_tag(tag, value);
}

void sentryReportNasalError(const std::string& msg, const string_list& stack)
{
    if (!static_sentryEnabled)
        return;
#if 0
    sentry_value_t exc = sentry_value_new_object();
    sentry_value_set_by_key(exc, "type", sentry_value_new_string("Exception"));
    sentry_value_set_by_key(exc, "value", sentry_value_new_string(msg.c_str()));

    sentry_value_t stackData = sentry_value_new_list();
    for (const auto& nasalFrame : stack) {
        sentry_value_append(stackData, sentry_value_new_string(nasalFrame.c_str()));
    }
    sentry_value_set_by_key(exc, "stack", stackData);

    
    sentry_value_t event = sentry_value_new_event();
    sentry_value_set_by_key(event, "exception", exc);
    
    // add the Nasal stack trace data
    
    // capture the C++ stack-trace. Probably not that useful but can't hurt
    sentry_event_value_add_stacktrace(event, nullptr, 0);
    
    sentry_capture_event(event);
    
#endif
}

void sentryReportException(const std::string& msg, const std::string& location)
{
    if (!static_sentryEnabled)
        return;

    sentry_value_t exc = sentry_value_new_object();
    sentry_value_set_by_key(exc, "type", sentry_value_new_string("Exception"));


    sentry_value_t info = sentry_value_new_object();
    if (!location.empty()) {
        sentry_value_set_by_key(info, "location", sentry_value_new_string(location.c_str()));
    }
    sentry_set_context("what", info);

    sentry_value_set_by_key(exc, "value", sentry_value_new_string(msg.c_str()));

    sentry_value_t event = sentry_value_new_event();
    sentry_value_set_by_key(event, "exception", exc);
    
    // capture the C++ stack-trace. Probably not that useful but can't hurt
    sentry_event_value_add_stacktrace(event, nullptr, 0);
    sentry_capture_event(event);
}

void  sentryReportFatalError(const std::string& msg, const std::string& more)
{
    if (!static_sentryEnabled)
        return;

    sentry_value_t sentryMessage = sentry_value_new_object();
    sentry_value_set_by_key(sentryMessage, "type", sentry_value_new_string("Fatal Error"));

    sentry_value_t info = sentry_value_new_object();
    if (!more.empty()) {
        sentry_value_set_by_key(info, "more", sentry_value_new_string(more.c_str()));
    }

    sentry_set_context("what", info);
    sentry_value_set_by_key(sentryMessage, "formatted", sentry_value_new_string(msg.c_str()));

    sentry_value_t event = sentry_value_new_event();
    sentry_value_set_by_key(event, "message", sentryMessage);
    
    sentry_event_value_add_stacktrace(event, nullptr, 0);
    sentry_capture_event(event);
}

void sentryThreadReportXMLErrors(bool report)
{
    perThread_reportXMLParseErrors = report;
}

} // of namespace

#else

// stubs for non-sentry case

namespace flightgear
{

void initSentry()
{
}

void shutdownSentry()
{
}

void delayedSentryInit()
{
}

bool isSentryEnabled()
{
    return false;
}

void addSentryBreadcrumb(const std::string&, const std::string&)
{
}

void addSentryTag(const char*, const char*)
{
}

void sentryReportNasalError(const std::string&, const string_list&)
{
}

void sentryReportException(const std::string&, const  std::string&)
{
}

void sentryReportFatalError(const std::string&, const std::string&)
{
}

void sentryThreadReportXMLErrors(bool)
{
}

} // of namespace

#endif

// common helpers

namespace flightgear
{

void addSentryTag(const std::string& tag, const std::string& value)
{
    if (tag.empty() || value.empty())
        return;
    
    addSentryTag(tag.c_str(), value.c_str());
}

SentryXMLErrorSupression::SentryXMLErrorSupression()
{
    sentryThreadReportXMLErrors(false);
}

SentryXMLErrorSupression::~SentryXMLErrorSupression()
{
    sentryThreadReportXMLErrors(true);
}

} // of namespace flightgear