import copy
import datetime
import json
import os
import ssl
import subprocess
import sys
import time
import traceback
import urllib.parse
import urllib.request
try:
    import Xlib.display
    from Xlib import X, XK
except ImportError:
    Xlib = False

"""
official api documentation:
https://github.com/ToontownRewritten/api-doc/blob/master/login.md
https://github.com/ToontownRewritten/api-doc/blob/master/invasions.md
"""

INVASIONS_API_URL = 'https://www.toontownrewritten.com/api/invasions?format=json'
LOGIN_API_URL = 'https://www.toontownrewritten.com/api/login?format=json'

if sys.platform == 'darwin':
    TOONTOWN_LIBRARY_PATH = os.path.join(
        os.path.expanduser('~'), 'Library',
        'Application Support', 'Toontown Rewritten',
    )
    TOONTOWN_ENGINE_DEFAULT_PATH = os.path.join(
        TOONTOWN_LIBRARY_PATH,
        'Toontown Rewritten',
    )
else:
    TOONTOWN_LIBRARY_PATH = None
    TOONTOWN_ENGINE_DEFAULT_PATH = None

if Xlib:
    EXTENDED_KEYBOARD_CONTROLS_DEFAULT_MAPPING = {
        XK.XK_w: XK.XK_Up,
        XK.XK_a: XK.XK_Left,
        XK.XK_s: XK.XK_Down,
        XK.XK_d: XK.XK_Right,
    }


def start_engine(engine_path, gameserver, playcookie, **kwargs):
    env = {
        'TTR_GAMESERVER': gameserver,
        'TTR_PLAYCOOKIE': playcookie,
    }
    if sys.platform == 'darwin':
        env['DYLD_LIBRARY_PATH'] = os.path.join(
            TOONTOWN_LIBRARY_PATH,
            'Libraries.bundle',
        )
        env['DYLD_FRAMEWORK_PATH'] = os.path.join(
            TOONTOWN_LIBRARY_PATH,
            'Frameworks',
        )
    elif sys.platform == 'linux' and 'XAUTHORITY' in os.environ:
        """
        Fix for TTREngine reporting:
        > :display:x11display(error): Could not open display ":0.0".
        > :ToonBase: Default graphics pipe is glxGraphicsPipe (OpenGL).
        > :ToonBase(warning): Unable to open 'onscreen' window.
        > Traceback (most recent call last):
        >   File "<compiled '__voltorbmain__'>", line 0, in <module>
        >   [...]
        >   File "<compiled 'direct.vlt8f63e471.ShowBase'>", line 0, in vltf05fd21b
        > Exception: Could not open window.
        """
        env['XAUTHORITY'] = os.environ['XAUTHORITY']
    return subprocess.Popen(
        args=[engine_path],
        cwd=os.path.dirname(engine_path),
        env=env,
        **kwargs,
    )


def api_request(url, params=None, validate_ssl_cert=True):
    resp = urllib.request.urlopen(
        url=url,
        data=urllib.parse.urlencode(params).encode('ascii')
            if params else None,
        context=None if validate_ssl_cert
            else ssl._create_unverified_context(),
    )
    return json.loads(resp.read().decode('ascii'))


class LoginSuccessful:

    def __init__(self, playcookie, gameserver):
        self.playcookie = playcookie
        self.gameserver = gameserver


class LoginDelayed:

    def __init__(self, queue_token):
        self.queue_token = queue_token


def login(username=None, password=None,
          queue_token=None, validate_ssl_cert=True):
    if username is not None and queue_token is None:
        assert password is not None
        req_params = {
            'username': username,
            'password': password,
        }
    elif username is None and queue_token is not None:
        req_params = {
            'queueToken': queue_token,
        }
    else:
        raise Exception('either specify username or queue token')
    resp_data = api_request(
        url=LOGIN_API_URL,
        params=req_params,
        validate_ssl_cert=validate_ssl_cert,
    )
    if resp_data['success'] == 'true':
        return LoginSuccessful(
            playcookie=resp_data['cookie'],
            gameserver=resp_data['gameserver'],
        )
    elif resp_data['success'] == 'delayed':
        return LoginDelayed(
            queue_token=resp_data['queueToken'],
        )
    else:
        raise Exception(repr(resp_data))


def x_find_window(parent_window, filter_callback):
    matching = []
    for child_window in parent_window.query_tree().children:
        if filter_callback(child_window):
            matching.append(child_window)
        matching += x_find_window(child_window, filter_callback)
    return matching


def x_find_window_by_pid(display, pid):
    pid_prop = display.intern_atom('_NET_WM_PID')

    def filter_callback(window):
        prop = window.get_full_property(pid_prop, X.AnyPropertyType)
        return prop and prop.value.tolist() == [pid]
    return x_find_window(display.screen().root, filter_callback)


def x_grab_key(grab_window, keycode, modifiers=None):
    if modifiers is None:
        modifiers = X.AnyModifier
    grab_window.grab_key(
        keycode,
        modifiers,
        # owner_events
        # https://stackoverflow.com/questions/32122360/x11-will-xgrabpointer-prevent-other-apps-from-any-mouse-event
        # False,
        True,
        X.GrabModeAsync,
        X.GrabModeAsync,
    )


def x_grab_keysym(xdisplay, grab_window, keysym, modifiers=None):
    x_grab_key(
        grab_window=grab_window,
        keycode=xdisplay.keysym_to_keycode(keysym),
        modifiers=modifiers,
    )


def x_ungrab_keysym(xdisplay, grab_window, keysym, modifiers=None):
    if modifiers is None:
        modifiers = X.AnyModifier
    grab_window.ungrab_key(
        xdisplay.keysym_to_keycode(keysym),
        modifiers,
    )


def wait_for_engine_window(xdisplay, engine_process, timeout_seconds=20, search_interval_seconds=2):
    start_epoch = time.time()
    while engine_process.poll() is None and (time.time() - start_epoch) <= timeout_seconds:
        windows = x_find_window_by_pid(xdisplay, engine_process.pid)
        assert len(windows) <= 1
        if len(windows) == 1:
            return windows[0]
        time.sleep(search_interval_seconds)
    return None


def _enable_extended_controls(xdisplay, engine_window, keyboard_mapping):
    for keysym in keyboard_mapping.keys():
        x_grab_keysym(xdisplay, engine_window, keysym)


def _disable_extended_controls(xdisplay, engine_window, keyboard_mapping):
    for keysym in keyboard_mapping.keys():
        x_ungrab_keysym(xdisplay, engine_window, keysym)


def run_extended_keyboard_controls(engine_process, toggle_keysym_name):
    if not Xlib:
        raise Exception('\n'.join([
            'Extended keyboard controls require xlib for python to be installed.',
            'Depending on your system run',
            '\t$ sudo apt-get install python3-xlib',
            'or',
            '\t$ pip3 install --user xlib',
        ]))
    xdisplay = Xlib.display.Display()
    engine_window = wait_for_engine_window(xdisplay, engine_process)
    if not engine_window:
        raise Exception('Could not find the game\'s window.')
    toggle_keysym = XK.string_to_keysym(toggle_keysym_name)
    if toggle_keysym == X.NoSymbol:
        raise Exception("Extended keyboard controls toggle:"
                        + " Unknown keysym name '{}'".format(toggle_keysym_name))
    x_grab_keysym(xdisplay, engine_window, toggle_keysym)
    keyboard_mapping = copy.deepcopy(
        EXTENDED_KEYBOARD_CONTROLS_DEFAULT_MAPPING
    )
    if toggle_keysym in keyboard_mapping:
        del keyboard_mapping[toggle_keysym]
        print("INFO Extended Controls:"
              + " Ignoring mapping for toggle key '{}'".format(toggle_keysym_name))
    print("INFO Extended Controls are currently off."
          + " Press key '{}' to enable.".format(toggle_keysym_name))
    controls_enabled = False
    while engine_process.poll() is None:
        # TODO don't block here, engine might have already been stopped
        xevent = xdisplay.next_event()
        # TODO investigate why some release events get lost
        if isinstance(xevent, Xlib.protocol.event.KeyPress) \
                or isinstance(xevent, Xlib.protocol.event.KeyRelease):
            keysym_in = xdisplay.keycode_to_keysym(
                xevent.detail,
                index=0,
            )
            if keysym_in == toggle_keysym:
                if isinstance(xevent, Xlib.protocol.event.KeyPress):
                    if controls_enabled:
                        _disable_extended_controls(
                            xdisplay,
                            engine_window,
                            keyboard_mapping,
                        )
                    else:
                        _enable_extended_controls(
                            xdisplay,
                            engine_window,
                            keyboard_mapping,
                        )
                    controls_enabled = not controls_enabled
                    print("INFO {} Extended Controls".format(
                        "Enabled" if controls_enabled else "Disabled",
                    ))
            else:
                if controls_enabled and keysym_in in keyboard_mapping:
                    keysym_out = keyboard_mapping[keysym_in]
                else:
                    keysym_out = keysym_in
                engine_window.send_event(type(xevent)(
                    window=engine_window,
                    detail=xdisplay.keysym_to_keycode(keysym_out),
                    state=0,
                    root_x=xevent.root_x,
                    root_y=xevent.root_y,
                    event_x=xevent.event_x,
                    event_y=xevent.event_y,
                    child=xevent.child,
                    root=xevent.root,
                    time=xevent.time,  # X.CurrentTime
                    same_screen=xevent.same_screen,
                ))


def launch(engine_path, username, password, validate_ssl_certs=True,
           cpu_limit_percent=None, enable_extended_keyboard_controls=False,
           extended_keyboard_control_toggle_keysym_name=None):
    result = login(
        username=username,
        password=password,
        validate_ssl_cert=validate_ssl_certs,
    )
    if isinstance(result, LoginDelayed):
        result = login(
            queue_token=result.queue_token,
            validate_ssl_cert=validate_ssl_certs,
        )
    if isinstance(result, LoginSuccessful):
        p = start_engine(
            engine_path=engine_path,
            gameserver=result.gameserver,
            playcookie=result.playcookie,
        )
        if cpu_limit_percent is not None:
            subprocess.Popen(args=[
                'cpulimit',
                '--pid', str(p.pid),
                '--limit', str(cpu_limit_percent),
                # '--verbose',
            ])
        if enable_extended_keyboard_controls:
            try:
                run_extended_keyboard_controls(
                    engine_process=p,
                    toggle_keysym_name=extended_keyboard_control_toggle_keysym_name,
                )
            except Exception as e:
                if isinstance(e, KeyboardInterrupt):
                    raise e
                else:
                    traceback.print_exc()
        if p.poll() is None:
            p.wait()
    else:
        raise Exception(repr(result))


class InvasionProgress:

    def __init__(self, district, date, cog_type,
                 despawned_number, total_number):
        self.district = district
        self.date = date
        self.cog_type = cog_type
        self.despawned_number = despawned_number
        self.total_number = total_number

    @property
    def remaining_number(self):
        return self.total_number - self.despawned_number


def request_active_invasions(validate_ssl_certs=True):
    resp_data = api_request(INVASIONS_API_URL)
    if resp_data['error'] is not None:
        raise Exception(resp_data['error'])
    else:
        invs = {}
        for district, inv_data in resp_data['invasions'].items():
            despawned_number, total_number = inv_data['progress'].split('/')
            invs[district] = InvasionProgress(
                district=district,
                date=datetime.datetime.utcfromtimestamp(inv_data['asOf']),
                cog_type=inv_data['type'],
                despawned_number=int(despawned_number),
                total_number=int(total_number),
            )
        return invs