import logging
from enum import Enum
from threading import Thread

import cv2
import math

import pywintypes
import win32gui
from win32api import GetSystemMetrics

import numpy as np
from PIL import ImageGrab



class Status(Enum):
    CRASHED = -1,
    STOPPED = 0,
    RUNNING = 1


class WindowServer:
    """
    Records the game window, and allows to create instance to process it
    """
    Screen = None
    windowOffset = None
    titleOffset = None
    hwnd = None
    status = Status.STOPPED


def init(borderless: bool):
    """
    Executed once before the main loop,
    Finds the game window, and calculates the offset to remove the title bar
    """
    try:
        WindowServer.hwnd = win32gui.FindWindow(None, "Elder Scrolls Online")
        rect = win32gui.GetWindowRect(WindowServer.hwnd)
        client_rect = win32gui.GetClientRect(WindowServer.hwnd)
        WindowServer.windowOffset = math.floor(((rect[2] - rect[0]) - client_rect[2]) / 2)
        WindowServer.titleOffset = ((rect[3] - rect[1]) - client_rect[3]) - WindowServer.windowOffset
        if borderless:
            WindowServer.titleOffset = 0
        WindowServer.status = Status.RUNNING
    except pywintypes.error:
        logging.error("Game window not found")
        WindowServer.status = Status.CRASHED


def loop():
    """
    Executed in the start of the main loop
    finds the game window location and captures it
    """
    bbox = (0, 0, GetSystemMetrics(0), GetSystemMetrics(1))

    temp_screen = np.array(ImageGrab.grab(bbox=bbox))

    temp_screen = cv2.cvtColor(temp_screen, cv2.COLOR_BGR2RGB)

    rect = win32gui.GetWindowRect(WindowServer.hwnd)
    crop = (
        rect[0] + WindowServer.windowOffset, rect[1] + WindowServer.titleOffset, rect[2] - WindowServer.windowOffset,
        rect[3] - WindowServer.windowOffset)

    WindowServer.Screen = temp_screen[crop[1]:crop[3], crop[0]:crop[2]]

    if WindowServer.Screen.size == 0:
        logging.error("Don't minimize or drag game window outside the screen")
        WindowServer.status = Status.CRASHED


def loop_end():
    cv2.waitKey(25)

    from fishy.engine.common.window import WindowClient
    for c in WindowClient.clients:
        if not c.showing:
            cv2.destroyWindow(c.show_name)


def run():
    # todo use config
    while WindowServer.status == Status.RUNNING:
        loop()
    loop_end()


def start():
    if WindowServer.status == Status.RUNNING:
        return

    init(False)
    if WindowServer.status == Status.RUNNING:
        Thread(target=run).start()


def screen_ready():
    return WindowServer.Screen is not None or WindowServer.status == Status.CRASHED


def stop():
    WindowServer.status = Status.STOPPED