import hashlib
import io
import os
import time
import requests

from PIL import Image
from selenium import webdriver
from selenium.webdriver.common.by import By


def fetch_image_urls(query: str, max_links_to_fetch: int, wd: webdriver, sleep_between_interactions: int = 1):
    def scroll_to_end(wd):
        wd.execute_script("window.scrollTo(0, document.body.scrollHeight);")
        time.sleep(sleep_between_interactions)

    search_url = "https://www.google.com/search?safe=off&site=&tbm=isch&source=hp&q={q}&oq={q}&gs_l=img"

    wd.get(search_url.format(q=query))

    image_urls = set()
    image_count = 0
    results_start = 0

    while image_count < max_links_to_fetch:
        scroll_to_end(wd)
        thumbnail_results = wd.find_elements(by=By.CSS_SELECTOR, value="img.Q4LuWd")
        number_results = len(thumbnail_results)

        print(f"Found: {number_results} search results. Extracting links from {results_start}:{number_results}")

        for img in thumbnail_results[results_start:number_results]:
            try:
                img.click()
                time.sleep(sleep_between_interactions)
            except Exception:
                continue

            actual_images = wd.find_elements(by=By.CSS_SELECTOR, value="img.n3VNCb")
            for actual_image in actual_images:
                if actual_image.get_attribute('src') and 'http' in actual_image.get_attribute('src'):
                    image_urls.add(actual_image.get_attribute('src'))

            image_count = len(image_urls)

            if len(image_urls) >= max_links_to_fetch:
                print(f"Found: {len(image_urls)} image links, done!")
                break
        else:
            print("Found:", len(image_urls), "image links, looking for more ...")
            time.sleep(1)
        results_start = len(thumbnail_results)

    return image_urls

def download_image(folder_path:str, url:str):
    try:
        image_content = requests.get(url).content

    except Exception as e:
        print(f"ERROR - Could not download {url} - {e}")

    try:
        image_file = io.BytesIO(image_content)
        image = Image.open(image_file).convert('RGB')
        file_path = os.path.join(folder_path,hashlib.sha1(image_content).hexdigest()[:10] + '.jpg')
        with open(file_path, 'wb') as f:
            image.save(f, "JPEG", quality=100)
        print(f"SUCCESS - saved {url} - as {file_path}")
    except Exception as e:
        print(f"ERROR - Could not save {url} - {e}")

def search_and_download(search_term:str, target_path='../learning/train', number_images=int):
    target_folder = os.path.join(target_path, '_'.join(search_term.lower().split(' ')))

    if not os.path.exists(target_folder):
        os.makedirs(target_folder)

    with webdriver.Chrome() as wd:
        res = fetch_image_urls(search_term, number_images, wd=wd, sleep_between_interactions=0.5)

    for elem in res:
        download_image(target_folder, elem)

print("Input search term: ", end='')
search_term = input()
print("Input number of images to download: ", end='')
number_images = int(input())

search_and_download(search_term=search_term, number_images=number_images)