"""
Viewport utilities — terminal dimensions and ANSI positioning helpers.
No internal dependencies.
"""

import os


def tw() -> int:
    """Get terminal width (columns)."""
    try:
        return os.get_terminal_size().columns
    except Exception:
        return 80


def th() -> int:
    """Get terminal height (lines)."""
    try:
        return os.get_terminal_size().lines
    except Exception:
        return 24


def move_to(row: int, col: int = 1) -> str:
    """Generate ANSI escape to move cursor to row, col (1-indexed)."""
    return f"\033[{row};{col}H"


def clear_screen() -> str:
    """Clear screen and move cursor to home."""
    return "\033[2J\033[H"


def clear_line() -> str:
    """Clear current line."""
    return "\033[K"