#include <mbgl/util/logging.hpp>
#include <mbgl/util/platform.hpp>
#include <mbgl/platform/thread.hpp>

#include <sys/prctl.h>
#include <sys/resource.h>

#include <cassert>
#include "jni.hpp"

// Implementation based on Chromium's platform_thread_android.cc.

namespace mbgl {
namespace platform {

thread_local static JNIEnv* env;
thread_local static bool detach;

std::string getCurrentThreadName() {
    char name[32] = "unknown";

    if (prctl(PR_GET_NAME, name) == -1) {
        Log::Warning(Event::General, "Couldn't get thread name");
    }

    return name;
}

void setCurrentThreadName(const std::string& name) {
    if (prctl(PR_SET_NAME, name.c_str()) == -1) {
        Log::Warning(Event::General, "Couldn't set thread name");
    }
}

void makeThreadLowPriority() {
    // ANDROID_PRIORITY_LOWEST = 19
    //
    // Supposedly would set the priority for the whole process, but
    // on Linux/Android it only sets for the current thread.
    setpriority(PRIO_PROCESS, 0, 19);
}

void attachThread() {
    using namespace android;
    assert(env == nullptr);
    detach = attach_jni_thread(theJVM, &env, platform::getCurrentThreadName());
}

void detachThread() {
    using namespace android;
    assert(env);
    detach_jni_thread(theJVM, &env, detach);
}

} // namespace platform
} // namespace mbgl