"""Separate injection timing from decoded-video sampling; run in test window only."""
import ctypes as C
import json
import os
import subprocess
import time

x = C.CDLL('libX11.so.6')
t = C.CDLL('libXtst.so.6')
x.XOpenDisplay.restype = C.c_void_p
x.XSync.argtypes = [C.c_void_p, C.c_int]
t.XTestFakeMotionEvent.argtypes = [C.c_void_p,C.c_int,C.c_int,C.c_int,C.c_ulong]
t.XTestFakeButtonEvent.argtypes = [C.c_void_p,C.c_uint,C.c_int,C.c_ulong]
d=x.XOpenDisplay(None)
assert d
x.XGetInputFocus.argtypes=[C.c_void_p,C.POINTER(C.c_ulong),C.POINTER(C.c_int)]
x.XFetchName.argtypes=[C.c_void_p,C.c_ulong,C.POINTER(C.c_char_p)]
wid=C.c_ulong();revert=C.c_int();name=C.c_char_p()
x.XGetInputFocus(d,C.byref(wid),C.byref(revert))
x.XQueryTree.argtypes=[C.c_void_p,C.c_ulong,C.POINTER(C.c_ulong),C.POINTER(C.c_ulong),C.POINTER(C.c_void_p),C.POINTER(C.c_uint)]
title=''
for _ in range(8):
    x.XFetchName(d,wid.value,C.byref(name))
    title=name.value.decode() if name.value else ''
    if title: break
    root=C.c_ulong();parent=C.c_ulong();children=C.c_void_p();count=C.c_uint()
    if not x.XQueryTree(d,wid.value,C.byref(root),C.byref(parent),C.byref(children),C.byref(count)): break
    if not parent.value or parent.value==wid.value:break
    wid.value=parent.value
assert title in ('Ubuntu drag rendering probe','VDI-Ubuntu - Moonlight'), title
t.XTestFakeMotionEvent(d,-1,800,700,0);x.XSync(d,0)
time.sleep(.5)
sent=[]
try:
    t.XTestFakeButtonEvent(d,1,1,0);x.XSync(d,0)
    time.sleep(.8)
    start=time.monotonic()
    for seq in range(1,301):
        time.sleep(max(0,start+(seq-1)/60-time.monotonic()))
        begin=time.monotonic()
        t.XTestFakeMotionEvent(d,-1,800+4*seq,700+seq,0)
        x.XSync(d,0)
        sent.append(dict(seq=seq,t=time.monotonic(),sync_ms=(time.monotonic()-begin)*1000))
    time.sleep(1)
finally:
    t.XTestFakeButtonEvent(d,1,0,0);x.XSync(d,0)
print(json.dumps(dict(title=title,events=sent)))