from base64 import b64decode
import tkinter as tk
from PIL import Image, ImageTk
from socketio import SimpleClient, exceptions
from threading import Thread
from requests import get
from datetime import datetime

COLORS = [(0x33, 0x33, 0x66), (0x96, 0x96, 0xe0)]
COLORS_UNPACKED = COLORS[0] + ((0, 0, 0) * 254) + COLORS[1]

SCREENSHOTS_TMPL = "./screenshots/%Y%m%d_%H%M%S.png"

class App(tk.Tk):
    def __init__(self, url: str = "https://onemillioncheckboxes.com") -> None:
        self.url = url
        super().__init__()
        self.title("1M pixels")

        self.sio = SimpleClient()

        self._canvas = tk.Canvas(self)
        self._canvas.config(width=1000, height=1000, borderwidth=0, highlightthickness=0)
        self._canvas.pack()
        self.config(width=1000, height=1000, borderwidth=0, highlightthickness=0)

        self._last_update = 0

        self._running = False

        self._image = Image.new("RGB", (1000, 1000), COLORS[0])

        self._canvas.bind("<Motion>", self._on_mouse_move)
        self._canvas.bind("<Button>", self._on_mouse_click)
        self.bind("<KeyPress>", self._on_key_down)


    def _on_mouse_move(self, event: tk.Event):
        self.title(f"1M pixels: {event.x}, {event.y}")

    def _on_mouse_click(self, event: tk.Event):
        x, y = event.x, event.y
        self.sio.emit("toggle_bit", { "index": x + y * 1000 })

    def _save_image(self):
        ts = datetime.fromtimestamp(self._last_update / 1000)
        path = ts.strftime(SCREENSHOTS_TMPL)
        print("SAVED", path)
        self._image.save(path)

        self.after(1000, self._save_image)

    def _on_key_down(self, event: tk.Event):
        # <KeyPress event state=Control keysym=r keycode=27 char='\x12' x=538 y=556>
        if event.keysym == "r":
            print("FULL REFRESH")
            with get(f"{self.url}/api/initial-state") as req:
                data = req.json()
                buffer = b64decode(data["full_state"].encode() + b"=")
                img = Image.frombytes("1", (1000, 1000), buffer).convert("P")
                img.putpalette(COLORS_UNPACKED)
                self._image.paste(img.convert("RGB"))
                self._last_update = data["timestamp"]
            print("FULL REFRESH DONE")

    def _reader(self):
        while self._running:
            try:
                name, data = self.sio.receive()
            except exceptions.TimeoutError:
                print("Timeout")
                continue

            if name == "batched_bit_toggles":
                bits_on, bits_off, timestamp = data
                if timestamp < self._last_update:
                    print("SKIP partial updates: too old")
                    continue
                self._last_update = timestamp
                for ndx in bits_on:
                    y, x = divmod(ndx, 1000)
                    self._image.putpixel((x, y), COLORS[1])
                for ndx in bits_off:
                    y, x = divmod(ndx, 1000)
                    self._image.putpixel((x, y), COLORS[0])
                self._tk_image.paste(self._image)
                print("partial update", len(bits_on), len(bits_off))

            elif name == "full_state":
                print("full update")
                buffer = b64decode(data["full_state"].encode() + b"=")
                img = Image.frombytes("1", (1000, 1000), buffer).convert("P")
                img.putpalette(COLORS_UNPACKED)
                self._image.paste(img.convert("RGB"))
                self._tk_image.paste(self._image)

            else:
                print(name, data)

        self.sio.disconnect()
        print("_reader exited")

    def _close(self):
        self._running = False
        print("waiting for reader to close")
        self._reader_thr.join()
        self.destroy()

    def start(self):
        self.sio.connect(f"{self.url}/socket.io")

        with get(f"{self.url}/api/initial-state") as req:
            data = req.json()
            buffer = b64decode(data["full_state"].encode() + b"=")
            self._last_update = data["timestamp"]
            img = Image.frombytes("1", (1000, 1000), buffer).convert("P")
            img.putpalette(COLORS_UNPACKED)
            self._image.paste(img.convert("RGB"))
            self._tk_image = ImageTk.PhotoImage(self._image)
            self._tk_image_id = self._canvas.create_image(0, 0, anchor="nw", image=self._tk_image)
        self._running = True

        self._reader_thr = Thread(target=self._reader, name="Reader thread")
        self._reader_thr.start()

        self.protocol("WM_DELETE_WINDOW", self._close)
        self.after(1000, self._save_image)
        self.mainloop()

if __name__ == "__main__":
    app = App()
    app.start()