from typing import List
import logging
import os


import psutil
from PIL import Image, ImageDraw, ImageFont


from .screen import Screen


class DebugScreen(Screen):
    def __init__(self, width: int, height: int, number_of_colour_bits: str):
        self.type = "Debug Screen"

        self.supports_custom_fonts = True

        self.width = width
        self.height = height
        self.image = Image.new(number_of_colour_bits, (self.width, self.height)) # Create a new image with 1 bit colour
        self.draw = ImageDraw.Draw(self.image)

    def setDefaultFont(self):
        logging.debug("setting font to default font")
        self.font = ImageFont.load_default()

    def setFont(self, font: str, size: int):
        logging.debug(f"setting font to {font} with size, {size}")
        self.font_size = size
        self.font = ImageFont.truetype(font, size)

    def clearBuffer(self):
        self.draw.rectangle((0, 0, self.width, self.height), outline=0, fill=0)

    def displayOnScreen(self):
        self.image.show()

    def displayLines(self, lines: List[str], x_margin: int = 2):
    # displays text on the screen, the line that is first in the list is displayed on the top
        self.clearBuffer()
        self.clearScreen()

        x_start = x_margin
        y_start = 0
        x_padding = 0
        y_padding = 0
        for i, line in enumerate(lines):
            self.draw.text(
                (
                    x_start+(i*x_padding),
                    y_start+y_padding
                ),
                line,
                font=self.font,
                fill=255
            )
            bounding_box = self.draw.textbbox(
                (
                    (x_start+x_padding),
                    y_start+y_padding,
                ),
                line,
                font=self.font,
            )
            bottom = bounding_box[3]
            y_padding = bottom
        self.displayOnScreen()

    def clearScreen(self):
        xdg_open_pid = -1
        for p in psutil.process_iter():
            if p.ppid() == os.getpid() and p.name() == "xdg-open":
                logging.debug(f"found xdg-open process with a process id {p.pid}")
                xdg_open_pid = p.pid
            elif xdg_open_pid != -1 and p.ppid() == xdg_open_pid:
                logging.debug(f"killing process, {p.name()} {p.cmdline()}")
                p.terminate()
                p.kill()

        self.clearBuffer()
        draw = ImageDraw.Draw(self.image)
        # black rectangle to clear screen, without clearing buffer
        draw.rectangle((0, 0, self.width, self.height), outline=0, fill=0)