# -*- coding: utf-8 -*-
r'''看当前桌面/窗口的真实状态 —— 诊断"桌面消失、一片蓝"。

用户报："我现在桌面消失了，电脑一片蓝，然后还有个蓝色的窗口"。

已知：
    18:42:41 机器异常关机（Kernel-Power 41 / EventLog 6008，无蓝屏记录）
    19:58:23 重新启动
    20:01:37 explorer 起来
    自启项里没有 ykxmz，当前也没有 ykxmz 在跑

要查的是：现在屏幕上到底有什么、是不是有全屏窗口盖住了桌面。
'''
from __future__ import annotations

import ctypes
import ctypes.wintypes as wt
import subprocess

user32 = ctypes.WinDLL("user32", use_last_error=True)

EnumWindows = user32.EnumWindows
EnumWindows.argtypes = [ctypes.WINFUNCTYPE(wt.BOOL, wt.HWND, wt.LPARAM),
                        wt.LPARAM]


class RECT(ctypes.Structure):
    _fields_ = [("left", wt.LONG), ("top", wt.LONG),
                ("right", wt.LONG), ("bottom", wt.LONG)]


def windows() -> list:
    out = []

    def cb(hwnd, _lp):
        if not user32.IsWindowVisible(hwnd):
            return True
        title = ctypes.create_unicode_buffer(512)
        user32.GetWindowTextW(hwnd, title, 512)
        cls = ctypes.create_unicode_buffer(256)
        user32.GetClassNameW(hwnd, cls, 256)
        r = RECT()
        user32.GetWindowRect(hwnd, ctypes.byref(r))
        pid = wt.DWORD()
        user32.GetWindowThreadProcessId(hwnd, ctypes.byref(pid))
        w, h = r.right - r.left, r.bottom - r.top
        if w > 80 and h > 80:
            out.append({"hwnd": hwnd, "title": title.value, "cls": cls.value,
                        "pid": pid.value, "w": w, "h": h,
                        "x": r.left, "y": r.top})
        return True

    EnumWindows(ctypes.WINFUNCTYPE(wt.BOOL, wt.HWND, wt.LPARAM)(cb), 0)
    return out


def proc_name(pid: int) -> str:
    try:
        r = subprocess.run(
            ["powershell", "-NoProfile", "-Command",
             "(Get-Process -Id %d -EA SilentlyContinue).ProcessName" % pid],
            capture_output=True, text=True, timeout=8)
        return (r.stdout or "").strip() or "?"
    except Exception:                                     # noqa: BLE001
        return "?"


def main() -> int:
    sw = user32.GetSystemMetrics(0)
    sh = user32.GetSystemMetrics(1)
    print("  屏幕: %d x %d" % (sw, sh))
    print("  当前输入桌面: %s" % _desktop_name())
    print()

    ws = windows()
    ws.sort(key=lambda w: w["w"] * w["h"], reverse=True)
    print("  可见窗口 %d 个（按面积排序，前 20）:" % len(ws))
    for w in ws[:20]:
        full = w["w"] >= sw - 4 and w["h"] >= sh - 4
        pn = proc_name(w["pid"])
        print("    %s %-14s pid=%-6d %dx%d @(%d,%d)"
              % ("★全屏" if full else "     ", pn, w["pid"],
                 w["w"], w["h"], w["x"], w["y"]))
        print("          类=%-22s 标题=%r" % (w["cls"][:22], w["title"][:60]))
    print()
    fulls = [w for w in ws if w["w"] >= sw - 4 and w["h"] >= sh - 4]
    if fulls:
        print("  ⚠ 有 %d 个全屏窗口 —— 下面这些就是盖住桌面的嫌疑：" % len(fulls))
        for w in fulls:
            print("      pid=%d (%s) 类=%s 标题=%r"
                  % (w["pid"], proc_name(w["pid"]), w["cls"], w["title"][:50]))
    else:
        print("  ✓ 没有全屏窗口盖着")
    print()
    ex = subprocess.run(["powershell", "-NoProfile", "-Command",
                         "Get-Process explorer -EA SilentlyContinue | "
                         "Select-Object -First 1 -ExpandProperty Id"],
                        capture_output=True, text=True, timeout=10)
    print("  explorer PID: %s" % ((ex.stdout or "").strip() or "**没在跑**"))
    return 0


def _desktop_name() -> str:
    """当前输入桌面的名字。Default = 正常，Winlogon = 锁屏。"""
    h = user32.OpenInputDesktop(0, False, 0x0001)
    if not h:
        return "(拿不到 —— 可能锁屏或没有交互桌面)"
    try:
        sb = ctypes.create_unicode_buffer(256)
        need = wt.DWORD()
        ok = user32.GetUserObjectInformationW(h, 2, sb, 512,
                                              ctypes.byref(need))
        return sb.value if ok else "(拿不到名字)"
    finally:
        user32.CloseDesktop(h)


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