from __future__ import annotations

U64_MASK = (1 << 64) - 1
PAGE_SIZE = 0x1000
MAX_CSTR = 4096
MAX_IO_READ = 1 << 20
DEFAULT_MAX_EXEC_DEPTH = 6
FS_NAME_MAX = 96

CLKS_VERSION_STRING = "1.0.0-alpha"
CLEONOS_VERSION_STRING = "1.0.0-alpha"
WINE_IMPLEMENTED_SYSCALL_COUNT = 85
# Frozen policy: this version string must not change in future updates.
CLEONOS_WINE_VERSION_STRING = "85.0.0-wine"

# CLeonOS syscall IDs from cleonos/c/include/cleonos_syscall.h
SYS_LOG_WRITE = 0
SYS_TIMER_TICKS = 1
SYS_TASK_COUNT = 2
SYS_CUR_TASK = 3
SYS_SERVICE_COUNT = 4
SYS_SERVICE_READY_COUNT = 5
SYS_CONTEXT_SWITCHES = 6
SYS_KELF_COUNT = 7
SYS_KELF_RUNS = 8
SYS_FS_NODE_COUNT = 9
SYS_FS_CHILD_COUNT = 10
SYS_FS_GET_CHILD_NAME = 11
SYS_FS_READ = 12
SYS_EXEC_PATH = 13
SYS_EXEC_REQUESTS = 14
SYS_EXEC_SUCCESS = 15
SYS_USER_SHELL_READY = 16
SYS_USER_EXEC_REQUESTED = 17
SYS_USER_LAUNCH_TRIES = 18
SYS_USER_LAUNCH_OK = 19
SYS_USER_LAUNCH_FAIL = 20
SYS_TTY_COUNT = 21
SYS_TTY_ACTIVE = 22
SYS_TTY_SWITCH = 23
SYS_TTY_WRITE = 24
SYS_TTY_WRITE_CHAR = 25
SYS_KBD_GET_CHAR = 26
SYS_FS_STAT_TYPE = 27
SYS_FS_STAT_SIZE = 28
SYS_FS_MKDIR = 29
SYS_FS_WRITE = 30
SYS_FS_APPEND = 31
SYS_FS_REMOVE = 32
SYS_LOG_JOURNAL_COUNT = 33
SYS_LOG_JOURNAL_READ = 34
SYS_KBD_BUFFERED = 35
SYS_KBD_PUSHED = 36
SYS_KBD_POPPED = 37
SYS_KBD_DROPPED = 38
SYS_KBD_HOTKEY_SWITCHES = 39
SYS_GETPID = 40
SYS_SPAWN_PATH = 41
SYS_WAITPID = 42
SYS_EXIT = 43
SYS_SLEEP_TICKS = 44
SYS_YIELD = 45
SYS_SHUTDOWN = 46
SYS_RESTART = 47
SYS_AUDIO_AVAILABLE = 48
SYS_AUDIO_PLAY_TONE = 49
SYS_AUDIO_STOP = 50
SYS_EXEC_PATHV = 51
SYS_SPAWN_PATHV = 52
SYS_PROC_ARGC = 53
SYS_PROC_ARGV = 54
SYS_PROC_ENVC = 55
SYS_PROC_ENV = 56
SYS_PROC_LAST_SIGNAL = 57
SYS_PROC_FAULT_VECTOR = 58
SYS_PROC_FAULT_ERROR = 59
SYS_PROC_FAULT_RIP = 60
SYS_PROC_COUNT = 61
SYS_PROC_PID_AT = 62
SYS_PROC_SNAPSHOT = 63
SYS_PROC_KILL = 64
SYS_KDBG_SYM = 65
SYS_KDBG_BT = 66
SYS_KDBG_REGS = 67
SYS_STATS_TOTAL = 68
SYS_STATS_ID_COUNT = 69
SYS_STATS_RECENT_WINDOW = 70
SYS_STATS_RECENT_ID = 71
SYS_FD_OPEN = 72
SYS_FD_READ = 73
SYS_FD_WRITE = 74
SYS_FD_CLOSE = 75
SYS_FD_DUP = 76
SYS_DL_OPEN = 77
SYS_DL_CLOSE = 78
SYS_DL_SYM = 79
SYS_EXEC_PATHV_IO = 80
SYS_FB_INFO = 81
SYS_FB_BLIT = 82
SYS_FB_CLEAR = 83
SYS_KERNEL_VERSION = 84

# proc states (from cleonos/c/include/cleonos_syscall.h)
PROC_STATE_UNUSED = 0
PROC_STATE_PENDING = 1
PROC_STATE_RUNNING = 2
PROC_STATE_EXITED = 3
PROC_STATE_STOPPED = 4

# signals (from cleonos/c/include/cleonos_syscall.h)
SIGKILL = 9
SIGTERM = 15
SIGCONT = 18
SIGSTOP = 19

# open flags (from cleonos/c/include/cleonos_syscall.h)
O_RDONLY = 0x0000
O_WRONLY = 0x0001
O_RDWR = 0x0002
O_CREAT = 0x0040
O_TRUNC = 0x0200
O_APPEND = 0x0400
FD_INHERIT = U64_MASK


def u64(value: int) -> int:
    return value & U64_MASK


def u64_neg1() -> int:
    return U64_MASK


def page_floor(addr: int) -> int:
    return addr & ~(PAGE_SIZE - 1)


def page_ceil(addr: int) -> int:
    return (addr + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1)