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#!/bin/python

import requests
import json
import sys
import os
from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont

# Defining URL for pulling the data
bing_url="https://www.bing.com/HPImageArchive.aspx?format=js&idx=0&n=1&mkt=de-DE"

# Path to the text file with the copyright text
local_copyright_file = '/home/alexgum/wallpapers/bing/bing_wallpaper_copyright.txt'

# Path to the font I am using
local_font = '/usr/share/fonts/TTF/Arial.TTF'

# Folder where I store wallpapers
wallpaper_folder = '/home/alexgum/wallpapers/bing/'

# Path to the temporary file
# Firstly, image is downloaded there
temp_file_path = '/tmp/bing_image_temp.jpg'

# Path to the final file which is going to be used by slick-greeter
greeter_file_path = '/mnt/data/greeter-wallpapers/bing_image.jpg'

# Icon I use to add locker watermark on the image for slock
lock_logo_file = '/home/alexgum/.config/icons/lock_64.png'

# Path to the image for slock
slock_file = '/home/alexgum/wallpapers/bing/current_lock_image.jpg'

# Function to extract file name from the JSON data
def make_img_file_name(full_json: dict) -> str:
    try:
        url_temp = full_json['images'][0]['url'].split('&')
        return url_temp[0].split('.')[1] + '.jpg'
    except Exception as e:
        print("make_img_file_name(): Error. Cannot produce file name.")
        print(e)
        sys.exit(1)

# Function to get URL for downloading picture
# Input - full JSON response, returns string with URL
def get_picture_url_from_json(full_json: dict) -> str:
    try:
        return 'https://bing.com/' + full_json['images'][0]['url']
    except Exception as e:
        print("get_picture_url(): Error. Cannot get picture url.")
        print(e)
        sys.exit(1)

# Function to get copyright information from the file on disk
# Input - path to a file with the copyright data of the current image
# Returns string with the copyright text, or "None"
def get_copyright_from_file(local_file_name: str) -> str:
    try:
        with open(local_file_name, 'rt') as f:
            return f.readline()
    except Exception:
        return "None"

# Function to get copyright information from the JSON data
# Input - full JSON response, returns string with the copyright text
def get_copyright_from_json(full_json: dict) -> str:
    try:
        return full_json['images'][0]['copyright']
    except Exception as e:
        print("get_copyright_from_json(): Error. Cannot get copyright from url.")
        print(e)
        sys.exit(1)

# Function to download image
# Input - URL and path to file where image to be stored
def img_download(url: str,
                 target_file: str = '/tmp/bing_image_temp.jpg') -> None:
    try:
        image_file = requests.get(url)
        with open(target_file, 'wb') as f:
            f.write(image_file.content)
    except Exception as e:
        print(e)
        sys.exit(1)

# Function to make wallper image with the copyright watermark
def make_new_wallpaper(source_file_path: str,
                       target_wallpaper_name: str,
                       copyright_text: str,
                       font_path: str = '/usr/share/fonts/TTF/Arial.TTF') -> None:

    # Code is based on this blog post:
    ##   https://betterprogramming.pub/add-copyright-or-watermark-to-photos-using-python-a3773c71d431

    # Preparing image for drawing (open canvas)
    img = Image.open(source_file_path)
    w, h = img.size

    # Preparing text for drawing
    ## Making drawing canvas
    drawing = ImageDraw.Draw(img)
    
    ## Creating text image
    cprw_font = ImageFont.truetype(font_path, 14)
    copyright_text_with_margins = " " + copyright_text + " "

    ## Identifying its dimensions
    text_w, text_h = drawing.textsize(copyright_text_with_margins,cprw_font)

    # Drawing new image from the text object
    c_text = Image.new('RGBA', (text_w, text_h), color = '#000000')
    drawing = ImageDraw.Draw(c_text)
    drawing.text((0,0),copyright_text_with_margins,fill = '#FFFFFF',font = cprw_font)
    # Adding Alpha channel value
    c_text.putalpha(130)

    # Identifying text position on the target picture
    # 10 pixels from top and 10 pixels from the right edge
    text_position = (w - text_w - 10), 10

    # Pasting this object into the image
    img.paste(c_text,text_position,mask=c_text)

    # Saving new image
    try:
        img.save(target_wallpaper_name)
    except Exception as e:
        print('make_new_wallpaper() function cannot save new picture.')
        print(e)
        sys.exit(1)

def add_logo(source_file_path: str,
             target_lock_file: str,
             logo: str) -> None:

    # Preparing image for drawing (open canvas)
    img = Image.open(source_file_path)
    w, h = img.size
    logo_img = Image.open(logo).convert('RGBA')
    logo_w, logo_h = logo_img.size

    # converting logo background to transparent and adding alpha channel 178 (80%) to black
    newImage = []
    for item in logo_img.getdata():
        if item[:3] == (255, 255, 255):
            newImage.append((255, 255, 255, 0))
        else:
            newImage.append((0,0,0,178))
    logo_img.putdata(newImage)
    logo_position = 10, (h - logo_h - 16)
    img.paste(logo_img,logo_position,mask=logo_img)

    # Saving new image
    try:
        img.save(target_lock_file)
    except Exception as e:
        print('add_logo() function cannot save new picture.')
        print(e)
        sys.exit(1)

# Main function to assemble it all
def main() -> None:
    try:
        # Getting the JSON data
        json_data = requests.get(bing_url).json()

        # Extracting new copyright text
        new_copyright_text = get_copyright_from_json(json_data)

        # Comparing the new copyright text with the stored in the file
        # If texts are different, then go on
        if get_copyright_from_file(local_copyright_file) != new_copyright_text:

            # Extracting new image file name from JSON
            file_name = wallpaper_folder + make_img_file_name(json_data)

            # Extracting URL for image download
            file_url = get_picture_url_from_json(json_data)

            # Downloading the image and saving it in the /tmp folder
            img_download(file_url, temp_file_path)

            # Creating wallpaper image with the copyright watermark
            # and saving it in the ~/wallpapers/bing/ folder
            make_new_wallpaper(temp_file_path, file_name, new_copyright_text, local_font)

            # Updating copyright information in the local file
            open(local_copyright_file,'wt').write(new_copyright_text)

            # Adding locker logo to make image for slock
            # this image is stored in the ~/wallpapers/bing/current_lock_image.jpg
            add_logo(file_name, slock_file, lock_logo_file)

            # Copy orignal image from /tmp to the /mnt/data/greeter-wallpapers/bing_image.jpg
            # for being used with slick-greeter
            os.system('cp ' + temp_file_path + ' ' + greeter_file_path)

            # Setting up betterlockscreen 
            ## Optional part I don't use anymore. 
            os.system('DISPLAY=:0 /usr/bin/betterlockscreen -u ' + file_name)
            
    except Exception as e:
        print(e)

if __name__ == '__main__':
    main()