#!/usr/bin/env python3
"""Check whether this machine can actually be driven.

Run it on the box that will do the clicking, before trusting a run:

    python diagnose.py

It answers the question a remote desktop makes hard — is the mouse really moving,
or is the viewer just not drawing it? The cursor position is read back from the
OS after each move, so the answer doesn't depend on anything being rendered.

Nothing is clicked. The cursor is moved and put back where it started.
"""

import os
import shutil
import sys
import time

from clicker import force_utf8_output


def line(label: str, value: str) -> None:
    print(f"  {label:<22} {value}")


def check_platform() -> None:
    print("\nPlatform")
    line("os", sys.platform)
    line("python", sys.version.split()[0])

    if sys.platform.startswith("linux"):
        # The two things that decide whether the clicker can work at all here.
        session = os.environ.get("XDG_SESSION_TYPE", "unknown")
        display = os.environ.get("DISPLAY") or "(unset)"
        line("session type", session)
        line("DISPLAY", display)
        line("xdotool", shutil.which("xdotool") or "NOT INSTALLED — sudo apt install -y xdotool")
        if session == "wayland" or (os.environ.get("WAYLAND_DISPLAY") and not os.environ.get("DISPLAY")):
            print("     Wayland cannot be automated: xdotool and pyautogui both speak X11,")
            print("     and Wayland does not let one client drive another. On Raspberry Pi OS:")
            print("     sudo raspi-config -> Advanced Options -> Wayland -> X11, then reboot.")
        return

    if sys.platform != "win32":
        return

    import ctypes

    # SM_REMOTESESSION: non-zero when this process is running inside an RDP
    # session rather than at the physical console.
    remote = ctypes.windll.user32.GetSystemMetrics(0x1000)
    line("remote session", "yes — RDP/terminal services" if remote else "no — physical console")
    if remote:
        print("     Input injection still works over RDP, but the session's desktop")
        print("     is locked when you disconnect, and clicks go nowhere until you")
        print("     reconnect. Keep the window open for the duration of a run.")


def check_dpi() -> None:
    print("\nDisplay")
    try:
        import focus
    except ImportError:
        line("dpi awareness", "focus.py not importable — run this from clicker/")
        return

    result = focus.enable_dpi_awareness()
    line("dpi awareness", result or "n/a (not Windows)")

    try:
        import pyautogui
    except ImportError:
        line("screen size", "pyautogui not installed")
        return
    size = pyautogui.size()
    line("screen size", f"{size.width}x{size.height} (as the OS reports it)")
    print("     Compare against what `clicker.py locate` reports for screenSize.")
    print("     A mismatch that isn't a clean scaling factor means clicks land off.")


def check_mouse() -> bool:
    """Move the cursor and read it back. Returns True if the OS agreed."""
    print("\nMouse")
    try:
        import pyautogui
    except ImportError:
        line("result", "pyautogui not installed — run: pip install -r requirements.txt")
        return False

    pyautogui.FAILSAFE = False        # a deliberate corner move would abort us
    start = pyautogui.position()
    line("start position", f"{start[0]},{start[1]}")

    width, height = pyautogui.size()
    targets = [(width // 4, height // 4), (width // 2, height // 2)]

    agreed = True
    for x, y in targets:
        pyautogui.moveTo(x, y, duration=0.3)
        time.sleep(0.1)
        got = pyautogui.position()
        ok = abs(got[0] - x) <= 2 and abs(got[1] - y) <= 2
        agreed &= ok
        line("moved to", f"{x},{y}  ->  OS reports {got[0]},{got[1]}  {'OK' if ok else 'MISMATCH'}")

    pyautogui.moveTo(start[0], start[1], duration=0.2)

    print()
    if agreed:
        print("  The OS moved the cursor to every requested point.")
        print("  If you saw nothing move, that is your viewer not drawing it —")
        print("  the clicks are landing where they should.")
    else:
        print("  The cursor did NOT land where it was asked to.")
        print("  On Windows this is usually display scaling: the process is being")
        print("  fed virtualised coordinates. Check the dpi awareness line above,")
        print("  and pass --scale to clicker.py to compensate.")
    return agreed


def check_foreground() -> None:
    print("\nForeground window")
    try:
        import focus
    except ImportError:
        line("frontmost", "focus.py not importable")
        return

    front = focus.frontmost()
    line("frontmost", front or "could not determine on this platform")
    line("browsers known", ", ".join(focus.browser_ids()) or "none for this platform")

    result = focus.ensure_frontmost()
    line("raise browser", f"{'OK' if result.ok else 'FAILED'} — {result.detail}")
    print("     With no browser named, any known one counts — that is this check")
    print("     only. A real run raises the browser the extension reported, so if")
    print("     this raised one you do not automate, that is not a fault.")
    if not result.ok:
        print("     Every click is refused while this fails: a click on an")
        print("     unfocused window is consumed activating it.")


def main() -> int:
    force_utf8_output()
    print("AutoFirmer clicker diagnostics")
    check_platform()
    check_dpi()
    ok = check_mouse()
    check_foreground()
    print()
    return 0 if ok else 1


if __name__ == "__main__":
    sys.exit(main())