/*
 * Copyright (c) 2018-2020 Atmosphère-NX
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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 <stratosphere.hpp>
#include "ro_debug_monitor_service.hpp"
#include "ro_ro_service.hpp"

extern "C" {
    extern u32 __start__;

    u32 __nx_applet_type = AppletType_None;
    u32 __nx_fs_num_sessions = 1;

    #define INNER_HEAP_SIZE 0x0
    size_t nx_inner_heap_size = INNER_HEAP_SIZE;
    char   nx_inner_heap[INNER_HEAP_SIZE];

    void __libnx_initheap(void);
    void __appInit(void);
    void __appExit(void);

    void *__libnx_alloc(size_t size);
    void *__libnx_aligned_alloc(size_t alignment, size_t size);
    void __libnx_free(void *mem);
}

namespace ams {

    ncm::ProgramId CurrentProgramId = ncm::SystemProgramId::Ro;

}

using namespace ams;

namespace ams::ro {

    namespace {

        /* ldr:ro, ro:dmnt, ro:1. */
        enum PortIndex {
            PortIndex_DebugMonitor,
            PortIndex_User,
            PortIndex_JitPlugin,
            PortIndex_Count,
        };

        constexpr sm::ServiceName DebugMonitorServiceName = sm::ServiceName::Encode("ro:dmnt");
        constexpr size_t          DebugMonitorMaxSessions = 2;

        /* NOTE: Official code passes 32 for ldr:ro max sessions. We will pass 2, because that's the actual limit. */
        constexpr sm::ServiceName UserServiceName = sm::ServiceName::Encode("ldr:ro");
        constexpr size_t          UserMaxSessions = 2;

        constexpr sm::ServiceName JitPluginServiceName = sm::ServiceName::Encode("ro:1");
        constexpr size_t          JitPluginMaxSessions = 2;

        static constexpr size_t MaxSessions = DebugMonitorMaxSessions + UserMaxSessions + JitPluginMaxSessions;

        using ServerOptions = sf::hipc::DefaultServerManagerOptions;

        class ServerManager final : public sf::hipc::ServerManager<PortIndex_Count, ServerOptions, MaxSessions> {
            private:
                virtual ams::Result OnNeedsToAccept(int port_index, Server *server) override;
        };

        using Allocator     = sf::ExpHeapAllocator;
        using ObjectFactory = sf::ObjectFactory<sf::ExpHeapAllocator::Policy>;

        alignas(0x40) constinit u8 g_server_allocator_buffer[4_KB];
        lmem::HeapHandle g_server_heap_handle;
        Allocator g_server_allocator;

        ServerManager g_server_manager;

        ams::Result ServerManager::OnNeedsToAccept(int port_index, Server *server) {
            switch (port_index) {
                case PortIndex_DebugMonitor:
                    return this->AcceptImpl(server, ObjectFactory::CreateSharedEmplaced<ro::impl::IDebugMonitorInterface, ro::DebugMonitorService>(std::addressof(g_server_allocator)));
                case PortIndex_User:
                    return this->AcceptImpl(server, ObjectFactory::CreateSharedEmplaced<ro::impl::IRoInterface, ro::RoService>(std::addressof(g_server_allocator), ro::NrrKind_User));
                case PortIndex_JitPlugin:
                    return this->AcceptImpl(server, ObjectFactory::CreateSharedEmplaced<ro::impl::IRoInterface, ro::RoService>(std::addressof(g_server_allocator), ro::NrrKind_JitPlugin));
                AMS_UNREACHABLE_DEFAULT_CASE();
            }
        }

        void *Allocate(size_t size) {
            return lmem::AllocateFromExpHeap(g_server_heap_handle, size);
        }

        void Deallocate(void *p, size_t size) {
            return lmem::FreeToExpHeap(g_server_heap_handle, p);
        }

        void InitializeHeap() {
            /* Setup server allocator. */
            g_server_heap_handle = lmem::CreateExpHeap(g_server_allocator_buffer, sizeof(g_server_allocator_buffer), lmem::CreateOption_None);
        }

        void LoopServer() {
            /* Create services. */
            R_ABORT_UNLESS(ro::g_server_manager.RegisterServer(PortIndex_DebugMonitor, DebugMonitorServiceName, DebugMonitorMaxSessions));

            R_ABORT_UNLESS(ro::g_server_manager.RegisterServer(PortIndex_User, UserServiceName, UserMaxSessions));
            if (hos::GetVersion() >= hos::Version_7_0_0) {
                R_ABORT_UNLESS(ro::g_server_manager.RegisterServer(PortIndex_JitPlugin, JitPluginServiceName, JitPluginMaxSessions));
            }

            /* Loop forever, servicing our services. */
            ro::g_server_manager.LoopProcess();
        }

    }

}

void __libnx_initheap(void) {
	void*  addr = nx_inner_heap;
	size_t size = nx_inner_heap_size;

	/* Newlib */
	extern char* fake_heap_start;
	extern char* fake_heap_end;

	fake_heap_start = (char*)addr;
	fake_heap_end   = (char*)addr + size;

    ams::ro::InitializeHeap();
}

void __appInit(void) {
    hos::InitializeForStratosphere();

    fs::SetAllocator(ro::Allocate, ro::Deallocate);

    sm::DoWithSession([&]() {
        R_ABORT_UNLESS(setsysInitialize());
        R_ABORT_UNLESS(fsInitialize());
        spl::Initialize();
        if (hos::GetVersion() < hos::Version_3_0_0) {
            R_ABORT_UNLESS(pminfoInitialize());
        }
    });

    R_ABORT_UNLESS(fs::MountSdCard("sdmc"));

    ams::CheckApiVersion();
}

void __appExit(void) {
    fsExit();
    if (hos::GetVersion() < hos::Version_3_0_0) {
        pminfoExit();
    }

    setsysExit();
}

namespace ams {

    void *Malloc(size_t size) {
        AMS_ABORT("ams::Malloc was called");
    }

    void Free(void *ptr) {
        AMS_ABORT("ams::Free was called");
    }

}

void *operator new(size_t size) {
    AMS_ABORT("operator new(size_t) was called");
}

void operator delete(void *p) {
    AMS_ABORT("operator delete(void *) was called");
}

void *__libnx_alloc(size_t size) {
    AMS_ABORT("__libnx_alloc was called");
}

void *__libnx_aligned_alloc(size_t alignment, size_t size) {
    AMS_ABORT("__libnx_aligned_alloc was called");
}

void __libnx_free(void *mem) {
    AMS_ABORT("__libnx_free was called");
}

int main(int argc, char **argv)
{
    /* Set thread name. */
    os::SetThreadNamePointer(os::GetCurrentThread(), AMS_GET_SYSTEM_THREAD_NAME(ro, Main));
    AMS_ASSERT(os::GetThreadPriority(os::GetCurrentThread()) == AMS_GET_SYSTEM_THREAD_PRIORITY(ro, Main));

    /* Attach the server allocator. */
    ro::g_server_allocator.Attach(ro::g_server_heap_handle);

    /* Disable auto-abort in fs operations. */
    fs::SetEnabledAutoAbort(false);

    /* Initialize Debug config. */
    {
        ON_SCOPE_EXIT { spl::Finalize(); };

        ro::SetDevelopmentHardware(spl::IsDevelopment());
        ro::SetDevelopmentFunctionEnabled(spl::IsDevelopmentFunctionEnabled());
    }

    /* Run the ro server. */
    ro::LoopServer();

    /* Cleanup */
    return 0;
}