# -*- coding: utf-8 -*-

from ctypes import (
    POINTER,
    Structure,
    c_int,
    c_long,
    c_ubyte,
    c_ulong,
    cdll,
    pointer,
    util,
)

libx11pth = util.find_library("X11")
if not libx11pth:
    raise ImportError("Couldn't find libX11")
try:
    libx11 = cdll.LoadLibrary(libx11pth)
except OSError:
    raise ImportError("Couldn't load libX11")

libxrandrpth = util.find_library("Xrandr")
if not libxrandrpth:
    raise ImportError("Couldn't find libXrandr")
try:
    libxrandr = cdll.LoadLibrary(libxrandrpth)
except OSError:
    raise ImportError("Couldn't load libXrandr")

import os
import sys

from DisplayCAL.options import debug

XA_CARDINAL = 6
XA_INTEGER = 19

Atom = c_ulong


class Display(Structure):
    __slots__ = []
    _fields_ = [("_opaque_struct", c_int)]


try:
    libx11.XInternAtom.restype = Atom
    libx11.XOpenDisplay.restype = POINTER(Display)
    libx11.XRootWindow.restype = c_ulong
    libx11.XGetWindowProperty.restype = c_int
    libx11.XGetWindowProperty.argtypes = [
        POINTER(Display),
        c_ulong,
        Atom,
        c_long,
        c_long,
        c_int,
        c_ulong,
        POINTER(c_ulong),
        POINTER(c_int),
        POINTER(c_ulong),
        POINTER(c_ulong),
        POINTER(POINTER(c_ubyte)),
    ]
except AttributeError as exception:
    raise ImportError(f"libX11: {exception}")

try:
    libxrandr.XRRGetOutputProperty.restype = c_int
    libxrandr.XRRGetOutputProperty.argtypes = [
        POINTER(Display),
        c_ulong,
        Atom,
        c_long,
        c_long,
        c_int,
        c_int,
        c_ulong,
        POINTER(c_ulong),
        POINTER(c_int),
        POINTER(c_ulong),
        POINTER(c_ulong),
        POINTER(POINTER(c_ubyte)),
    ]
except AttributeError as exception:
    raise ImportError(f"libXrandr: {exception}")


class XDisplay:
    def __init__(self, name=None):
        self.name = name or os.getenv("DISPLAY")

    def __enter__(self):
        self.open()
        return self

    def __exit__(self, etype, value, tb):
        self.close()

    def open(self):
        self.display = libx11.XOpenDisplay(self.name.encode())
        if not self.display:
            raise ValueError(f"Invalid X display {repr(self.name)}")

    def close(self):
        libx11.XCloseDisplay(self.display)

    def intern_atom(self, atom_name):
        atom_id = libx11.XInternAtom(self.display, atom_name, False)
        if not atom_id:
            raise ValueError(f"Invalid atom name {repr(atom_name)}")

        return atom_id

    def root_window(self, screen_no=0):
        window = libx11.XRootWindow(self.display, screen_no)
        if not window:
            raise ValueError(f"Invalid X screen {repr(screen_no)}")

        return window

    def get_window_property(self, window, atom_id, atom_type=XA_CARDINAL):
        ret_type, ret_format, ret_len, ret_togo, atomv = (
            c_ulong(),
            c_int(),
            c_ulong(),
            c_ulong(),
            pointer(c_ubyte()),
        )

        property = None
        if (
            libx11.XGetWindowProperty(
                self.display,
                window,
                atom_id,
                0,
                0x7FFFFFF,
                False,
                atom_type,
                ret_type,
                ret_format,
                ret_len,
                ret_togo,
                atomv,
            )
            == 0
            and ret_len.value > 0
        ):
            if debug:
                print("ret_type:", ret_type.value)
                print("ret_format:", ret_format.value)
                print("ret_len:", ret_len.value)
                print("ret_togo:", ret_togo.value)
            property = [atomv[i] for i in range(ret_len.value)]

        return property

    def get_output_property(self, output, atom_id, atom_type=XA_CARDINAL):
        if not output:
            raise ValueError(f"Invalid output {repr(output)} specified")

        ret_type, ret_format, ret_len, ret_togo, atomv = (
            c_ulong(),
            c_int(),
            c_ulong(),
            c_ulong(),
            pointer(c_ubyte()),
        )

        property = None
        if (
            libxrandr.XRRGetOutputProperty(
                self.display,
                output,
                atom_id,
                0,
                0x7FFFFFF,
                False,
                False,
                atom_type,
                ret_type,
                ret_format,
                ret_len,
                ret_togo,
                atomv,
            )
            == 0
            and ret_len.value > 0
        ):
            if debug:
                print("ret_type:", ret_type.value)
                print("ret_format:", ret_format.value)
                print("ret_len:", ret_len.value)
                print("ret_togo:", ret_togo.value)
            property = [atomv[i] for i in range(ret_len.value)]

        return property


if __name__ == "__main__":
    with XDisplay() as display:
        property = display.get_output_property(
            int(sys.argv[1]), sys.argv[2], int(sys.argv[3])
        )
        print("{} for display {}: {}".format(sys.argv[2], sys.argv[1], repr(property)))