from PIL import Image

class ProotState:
    _instance = None

    def __new__(cls):
        if cls._instance is None:
            cls._instance = super().__new__(cls)
            cls._instance.current_blink_state = 0
            cls._instance.desired_blink_state = 0
            cls._instance.blinks_frames_ready = False
            cls._instance.loading_screen = True
            cls._instance.loading_time = 0
            cls._instance.frame_canvas_prootScreen_1 = False
            cls._instance.frame_canvas_prootScreen_2 = False
            cls._instance.frame_canvas_prootScreen_3 = False
            cls._instance.matrix = False
        return cls._instance
    
    def set_matrix(self, matrix):
        self.matrix = matrix

    def next_blink_frame_number(self) -> int:        
        if self.current_blink_state == self.desired_blink_state == 10:
            self.desired_blink_state = 0
            return self.current_blink_state
        
        if self.current_blink_state == self.desired_blink_state == 0:
            return self.current_blink_state

        if self.current_blink_state < self.desired_blink_state:
            self.current_blink_state += 1
        else:
            self.current_blink_state -= 1

        return self.current_blink_state
    
    def blink(self, state = 10):
        self.set_desired_blink_state(state)
    
    def set_desired_blink_state(self, state: int):
        self.desired_blink_state = state

    def set_blinks_frames_ready(self, ready: bool):
        self.blinks_frames_ready = ready

    def get_desired_blink_state(self) -> int:
        return self.desired_blink_state

    def get_blinks_frames_ready(self) -> bool:
        return self.blinks_frames_ready
    
    # This function animates the loading screen. It asumes that the function gets called frequently(every frame update)
    def set_ProotScreen(self, matrix):
        self.loading_time += 1
        self.loading_time = self.loading_time % 75
        if not self.frame_canvas_prootScreen_1:
            self.frame_canvas_prootScreen_1 = matrix.CreateFrameCanvas()
            image_proot_screen_1 = Image.open("faces/ProotScreen1.png").convert('RGB')
            self.frame_canvas_prootScreen_1.SetImage(image_proot_screen_1, unsafe=False)
            matrix.SwapOnVSync(self.frame_canvas_prootScreen_1)
            
        if not self.frame_canvas_prootScreen_2:
            self.frame_canvas_prootScreen_2 = matrix.CreateFrameCanvas()
            image_proot_screen_2 = Image.open("faces/ProotScreen2.png").convert('RGB')
            self.frame_canvas_prootScreen_2.SetImage(image_proot_screen_2, unsafe=False)
            matrix.SwapOnVSync(self.frame_canvas_prootScreen_2)
            
        if not self.frame_canvas_prootScreen_3:
            self.frame_canvas_prootScreen_3 = matrix.CreateFrameCanvas()
            image_proot_screen_3 = Image.open("faces/ProotScreen3.png").convert('RGB')
            self.frame_canvas_prootScreen_3.SetImage(image_proot_screen_3, unsafe=False)
            matrix.SwapOnVSync(self.frame_canvas_prootScreen_3)
            
        if self.loading_time < 25:
            matrix.SwapOnVSync(self.frame_canvas_prootScreen_1)
        elif self.loading_time < 50:
            matrix.SwapOnVSync(self.frame_canvas_prootScreen_2)
        else:
            matrix.SwapOnVSync(self.frame_canvas_prootScreen_3)


    def update_screen(blinkFrameCanvases, matrix):

        proot_state = ProotState()

        if proot_state.get_blinks_frames_ready():
            # TODO move blinking animation writing logic to the ProotState class
            matrix.SwapOnVSync(blinkFrameCanvases[proot_state.next_blink_frame_number()])
        else:
            proot_state.set_ProotScreen(matrix)