import requests
import time
import io
import os
import re
import json
import random
from PIL import Image, UnidentifiedImageError

# Load the ImgBB API key from the environment variables.
IMGBB_API_KEY = os.getenv("IMGBB_API_KEY")

def upload_to_imgbb(image_path, file_name):
    """
    Uploads the image located at image_path to ImgBB.
    Returns:
        str: URL of the uploaded image on ImgBB or None if failed.
    """
    try:
        with open(image_path, 'rb') as f:
            image_data = f.read()
        response = requests.post(
            "https://api.imgbb.com/1/upload",
            params={"key": IMGBB_API_KEY},
            files={"image": (file_name, image_data)}
        )
        response.raise_for_status()
        result = response.json()
        if result.get("data") and "url" in result["data"]:
            return result["data"]["url"]
        else:
            print("Failed to upload image to ImgBB.")
            return None
    except requests.RequestException as e:
        print(f"Error uploading image to ImgBB: {e}")
        return None
    except Exception as e:
        print(f"Unexpected error uploading image to ImgBB: {e}")
        return None

def generate_image(prompt, request_id, current_request_id, image_dir, attempt=0):
    """
    Generate an image using the Pollinations API.
    
    Parameters:
        prompt (str): The prompt for image generation.
        width (int): Desired image width.
        height (int): Desired image height.
        request_id (int): The request id for the current operation.
        current_request_id (int): The current active request id.
        image_dir (str): Directory where image will be saved.
        attempt (int): Current attempt count (zero-indexed).
    
    Returns:
        tuple: (PIL.Image object, image_path (str), returned_prompt (str), image_url (str))
        or None if image fetch fails or request id mismatches.
    """
    model = "flux"
    width = 1920
    height = 1080
    randomSeed = random.randint(0, 999999)
    url = f"https://image.pollinations.ai/prompt/{prompt}?nologo=true&safe=false&private=true&model={model}&enhance=true&width={width}&height={height}&seed={randomSeed}"
    print(f"Attempt {attempt + 1}: Fetching image with URL: {url}")
    
    try:
        response = requests.get(url, timeout=45)
    except Exception as e:
        print(f"Error fetching image: {e}")
        return None

    if response.status_code != 200:
        print(f"Failed to fetch image. Status code: {response.status_code}")
        return None

    if request_id != current_request_id:
        print("Request ID mismatch. Operation cancelled.")
        return None

    print("Image fetched successfully.")
    image_data = response.content

    try:
        image = Image.open(io.BytesIO(image_data))
        actual_width, actual_height = image.size
        print(f"Actual image dimensions: {actual_width}x{actual_height}")
        
        # Extract metadata from EXIF if available
        exif_data = image.info.get('exif', b'')
        returned_prompt = prompt
        if exif_data:
            json_match = re.search(b'{"prompt":.*}', exif_data)
            if json_match:
                json_str = json_match.group(0).decode('utf-8')
                try:
                    metadata_dict = json.loads(json_str)
                    returned_prompt = metadata_dict.get('prompt', prompt)
                except json.JSONDecodeError as e:
                    print(f"Failed to parse JSON in metadata: {e}")
            else:
                print("No JSON data found in EXIF")
        
        if (actual_width, actual_height) != (width, height):
            print(f"Warning: Received image dimensions ({actual_width}x{actual_height}) do not match requested dimensions ({width}x{height})")
    except UnidentifiedImageError:
        print("Error: Received data is not a valid image.")
        raise

    timestamp = int(time.time())
    image_filename = f"background_{timestamp}.png"
    image_path = os.path.join(image_dir, image_filename)
    
    # Ensure the image directory exists
    os.makedirs(image_dir, exist_ok=True)
    
    try:
        image.save(image_path, 'PNG')
        print(f"Image saved to {image_path}")
        # Upload image to ImgBB
        image_url = upload_to_imgbb(image_path, image_filename)
        if image_url:
            print(f"Image uploaded to ImgBB: {image_url}")
        else:
            print("Failed to upload image to ImgBB.")
    except Exception as e:
        print(f"Error saving image: {e}")
        return None

    return image, image_path, returned_prompt, image_url

# if __name__ == "__main__":
#     from dotenv import load_dotenv

#     load_dotenv()
#     # Example usage
#     prompt = "Beach party, anime style, vibrant colors"
#     request_id = 1
#     current_request_id = 1
#     image_dir = "./images"
    
#     image, image_path, returned_prompt, image_url = generate_image(prompt, request_id, current_request_id, image_dir)
    
#     if image:
#         print(f"Image generated and saved at {image_path}")
#         print(f"Returned prompt: {returned_prompt}")
#         print(f"Image URL: {image_url}")
#     else:
#         print("Failed to generate image.")