#include <bits/error.h>
#include <fcntl.h>
#include <luna.h>
#include <luna/syscall.h>
#include <stdarg.h>
#include <unistd.h>

extern "C"
{
    int execv(const char* program, char* const[])
    {
        return (int)syscall(SYS_exec, program);
    }
    int execve(const char*, char* const[], char* const[])
    {
        NOT_IMPLEMENTED("execve");
    }
    int execvp(const char*, char* const[])
    {
        NOT_IMPLEMENTED("execvp");
    }
    pid_t fork(void)
    {
        NOT_IMPLEMENTED("fork");
    }

    long syscall(long number, ...)
    {
        typedef unsigned long int arg;
        long result;
        va_list ap;
        va_start(ap, number);
        switch (number)
        {
        case SYS_yield:
        case SYS_gettid: result = __luna_syscall0(number); break;
        case SYS_exit:
        case SYS_close:
        case SYS_exec:
        case SYS_sleep: result = __luna_syscall1(number, va_arg(ap, arg)); break;
        case SYS_munmap:
        case SYS_open: {
            arg arg0 = va_arg(ap, arg);
            arg arg1 = va_arg(ap, arg);
            result = __luna_syscall2(number, arg0, arg1);
            break;
        }
        case SYS_fcntl:
        case SYS_seek:
        case SYS_write:
        case SYS_read:
        case SYS_mprotect:
        case SYS_mmap: {
            arg arg0 = va_arg(ap, arg);
            arg arg1 = va_arg(ap, arg);
            arg arg2 = va_arg(ap, arg);
            result = __luna_syscall3(number, arg0, arg1, arg2);
            break;
        }
        case SYS_paint: {
            arg arg0 = va_arg(ap, arg);
            arg arg1 = va_arg(ap, arg);
            arg arg2 = va_arg(ap, arg);
            arg arg3 = va_arg(ap, arg);
            arg arg4 = va_arg(ap, arg);
            result = __luna_syscall5(number, arg0, arg1, arg2, arg3, arg4);
            break;
        }
        default: result = -ENOSYS; break;
        }
        va_end(ap);
        if (number == SYS_mmap) { _RETURN_WITH_MEMORY_ERRNO(result, long int); }
        else { _RETURN_WITH_ERRNO(result, long); }
    }

    unsigned int sleep(unsigned int seconds)
    {
        return msleep(seconds * 1000);
    }

    ssize_t read(int fd, void* buf, size_t count)
    {
        return syscall(SYS_read, fd, count, buf); // yes, our read() syscall is in the wrong order.
    }

    ssize_t write(int fd, const void* buf, size_t count)
    {
        return syscall(SYS_write, fd, count, buf); // yes, our write() syscall is in the wrong order.
    }

    int close(int fd)
    {
        return (int)syscall(SYS_close, fd);
    }

    off_t lseek(int fd, off_t offset, int whence)
    {
        return syscall(SYS_seek, fd, offset, whence);
    }

    __lc_noreturn void _exit(int status)
    {
        syscall(SYS_exit, status);
        __lc_unreachable();
    }

    int dup(int fd)
    {
        return fcntl(fd, F_DUPFD, 0);
    }
}