// SPDX-License-Identifier: MIT
/*
$info$
tags: LinuxSyscalls|syscalls-shared
$end_info$
*/

#include "LinuxSyscalls/Syscalls.h"
#include "LinuxSyscalls/x64/Syscalls.h"
#include "LinuxSyscalls/x32/Syscalls.h"

#include <FEXCore/IR/IR.h>

#include <FEXHeaderUtils/Syscalls.h>

#include <fcntl.h>
#include <stdint.h>
#include <sys/file.h>
#include <sys/eventfd.h>
#include <sys/inotify.h>
#include <sys/mman.h>
#include <sys/timerfd.h>
#include <poll.h>
#include <stddef.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/eventfd.h>
#include <sys/syscall.h>

namespace FEX::HLE {
  void RegisterFD(FEX::HLE::SyscallHandler *Handler) {
    using namespace FEXCore::IR;

    REGISTER_SYSCALL_IMPL_FLAGS(open, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
      [](FEXCore::Core::CpuStateFrame *Frame, const char *pathname, int flags, uint32_t mode) -> uint64_t {
      flags = FEX::HLE::RemapFromX86Flags(flags);
      uint64_t Result = FEX::HLE::_SyscallHandler->FM.Open(pathname, flags, mode);
      SYSCALL_ERRNO();
    });

    REGISTER_SYSCALL_IMPL_FLAGS(close, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
      [](FEXCore::Core::CpuStateFrame *Frame, int fd) -> uint64_t {
      uint64_t Result = FEX::HLE::_SyscallHandler->FM.Close(fd);
      SYSCALL_ERRNO();
    });

    REGISTER_SYSCALL_IMPL_FLAGS(chown, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
      [](FEXCore::Core::CpuStateFrame *Frame, const char *pathname, uid_t owner, gid_t group) -> uint64_t {
      uint64_t Result = ::chown(pathname, owner, group);
      SYSCALL_ERRNO();
    });

    REGISTER_SYSCALL_IMPL_FLAGS(lchown, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
      [](FEXCore::Core::CpuStateFrame *Frame, const char *pathname, uid_t owner, gid_t group) -> uint64_t {
      uint64_t Result = ::lchown(pathname, owner, group);
      SYSCALL_ERRNO();
    });

    REGISTER_SYSCALL_IMPL_FLAGS(access, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
      [](FEXCore::Core::CpuStateFrame *Frame, const char *pathname, int mode) -> uint64_t {
      uint64_t Result = FEX::HLE::_SyscallHandler->FM.Access(pathname, mode);
      SYSCALL_ERRNO();
    });

    REGISTER_SYSCALL_IMPL_FLAGS(pipe, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
      [](FEXCore::Core::CpuStateFrame *Frame, int pipefd[2]) -> uint64_t {
      uint64_t Result = ::pipe(pipefd);
      SYSCALL_ERRNO();
    });

    REGISTER_SYSCALL_IMPL_FLAGS(dup3, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
      [](FEXCore::Core::CpuStateFrame* Frame, int oldfd, int newfd, int flags) -> uint64_t {
      flags = FEX::HLE::RemapFromX86Flags(flags);
      uint64_t Result = ::dup3(oldfd, newfd, flags);
      SYSCALL_ERRNO();
    });

    REGISTER_SYSCALL_IMPL_FLAGS(inotify_init, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
      [](FEXCore::Core::CpuStateFrame *Frame) -> uint64_t {
      uint64_t Result = ::inotify_init();
      SYSCALL_ERRNO();
    });

    REGISTER_SYSCALL_IMPL_FLAGS(openat, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
      [](FEXCore::Core::CpuStateFrame *Frame, int dirfs, const char *pathname, int flags, uint32_t mode) -> uint64_t {
      flags = FEX::HLE::RemapFromX86Flags(flags);
      uint64_t Result = FEX::HLE::_SyscallHandler->FM.Openat(dirfs, pathname, flags, mode);
      SYSCALL_ERRNO();
    });

    REGISTER_SYSCALL_IMPL_FLAGS(readlinkat, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
      [](FEXCore::Core::CpuStateFrame *Frame, int dirfd, const char *pathname, char *buf, size_t bufsiz) -> uint64_t {
      uint64_t Result = FEX::HLE::_SyscallHandler->FM.Readlinkat(dirfd, pathname, buf, bufsiz);
      SYSCALL_ERRNO();
    });

    REGISTER_SYSCALL_IMPL_FLAGS(faccessat, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
      [](FEXCore::Core::CpuStateFrame *Frame, int dirfd, const char *pathname, int mode) -> uint64_t {
      uint64_t Result = FEX::HLE::_SyscallHandler->FM.FAccessat(dirfd, pathname, mode);
      SYSCALL_ERRNO();
    });

    if (Handler->IsHostKernelVersionAtLeast(5, 8, 0)) {
      // Only exists on kernel 5.8+
      REGISTER_SYSCALL_IMPL_FLAGS(faccessat2, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
        [](FEXCore::Core::CpuStateFrame *Frame, int dirfd, const char *pathname, int mode, int flags) -> uint64_t {
        uint64_t Result = FEX::HLE::_SyscallHandler->FM.FAccessat2(dirfd, pathname, mode, flags);
        SYSCALL_ERRNO();
      });

      REGISTER_SYSCALL_IMPL_FLAGS(openat2, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
        [](FEXCore::Core::CpuStateFrame *Frame, int dirfs, const char *pathname, struct open_how *how, size_t usize) -> uint64_t {
        open_how HostHow{};
        size_t HostSize = std::min(sizeof(open_how), usize);
        memcpy(&HostHow, how, HostSize);

        HostHow.flags = FEX::HLE::RemapFromX86Flags(HostHow.flags);
        uint64_t Result = FEX::HLE::_SyscallHandler->FM.Openat2(dirfs, pathname, &HostHow, HostSize);
        SYSCALL_ERRNO();
      });
    }
    else {
      REGISTER_SYSCALL_IMPL(faccessat2, UnimplementedSyscallSafe);
      REGISTER_SYSCALL_IMPL(openat2, UnimplementedSyscallSafe);
    }

    REGISTER_SYSCALL_IMPL_FLAGS(eventfd, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
      [](FEXCore::Core::CpuStateFrame *Frame, uint32_t count) -> uint64_t {
      uint64_t Result = ::syscall(SYSCALL_DEF(eventfd2), count, 0);
      SYSCALL_ERRNO();
    });

    REGISTER_SYSCALL_IMPL_FLAGS(pipe2, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
      [](FEXCore::Core::CpuStateFrame *Frame, int pipefd[2], int flags) -> uint64_t {
      flags = FEX::HLE::RemapFromX86Flags(flags);
      uint64_t Result = ::pipe2(pipefd, flags);
      SYSCALL_ERRNO();
    });

    REGISTER_SYSCALL_IMPL_FLAGS(statx, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
      [](FEXCore::Core::CpuStateFrame *Frame, int dirfd, const char *pathname, int flags, uint32_t mask, struct statx *statxbuf) -> uint64_t {
      // Flags don't need remapped
      uint64_t Result = FEX::HLE::_SyscallHandler->FM.Statx(dirfd, pathname, flags, mask, statxbuf);
      SYSCALL_ERRNO();
    });

    if (Handler->IsHostKernelVersionAtLeast(5, 9, 0)) {
      REGISTER_SYSCALL_IMPL_FLAGS(close_range, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
        [](FEXCore::Core::CpuStateFrame *Frame, unsigned int first, unsigned int last, unsigned int flags) -> uint64_t {
        uint64_t Result = FEX::HLE::_SyscallHandler->FM.CloseRange(first, last, flags);
        SYSCALL_ERRNO();
      });
    }
    else {
      REGISTER_SYSCALL_IMPL(close_range, UnimplementedSyscallSafe);
    }
  }
}