from django.core.files.base import ContentFile
from django.utils.text import slugify
from ..models.images import ImageLibrary
import os

try:
    import requests
except ImportError:
    requests = None
from PIL import Image as PILImage


def create_image_from_file(
    file_path, name, description="", alt_text="", category="other", tags=""
):
    """
    Create an ImageLibrary entry from a local file.

    Args:
        file_path: Path to the image file
        name: Name for the image
        description: Optional description
        alt_text: Alternative text for accessibility
        category: Image category
        tags: Comma-separated tags

    Returns:
        ImageLibrary instance or None if failed
    """
    try:
        if not os.path.exists(file_path):
            print(f"File not found: {file_path}")
            return None

        # Generate slug
        slug = slugify(name)

        # Check if image already exists
        if ImageLibrary.objects.filter(slug=slug).exists():
            print(f"Image with slug '{slug}' already exists")
            return ImageLibrary.objects.get(slug=slug)

        # Create image library entry
        image_lib = ImageLibrary(
            name=name,
            slug=slug,
            description=description,
            alt_text=alt_text or name,
            category=category,
            tags=tags,
        )

        # Read and save the image file
        with open(file_path, "rb") as f:
            image_lib.image.save(
                os.path.basename(file_path), ContentFile(f.read()), save=True
            )

        print(f"Created image library entry: {name}")
        return image_lib

    except Exception as e:
        print(f"Error creating image library entry: {e}")
        return None


def create_image_from_url(
    url, name, description="", alt_text="", category="other", tags=""
):
    """
    Create an ImageLibrary entry from a URL.

    Args:
        url: URL to the image
        name: Name for the image
        description: Optional description
        alt_text: Alternative text for accessibility
        category: Image category
        tags: Comma-separated tags

    Returns:
        ImageLibrary instance or None if failed
    """
    if requests is None:
        print("requests library is not installed. Cannot download from URL.")
        return None

    try:
        # Generate slug
        slug = slugify(name)

        # Check if image already exists
        if ImageLibrary.objects.filter(slug=slug).exists():
            print(f"Image with slug '{slug}' already exists")
            return ImageLibrary.objects.get(slug=slug)

        # Download the image
        response = requests.get(url)
        response.raise_for_status()

        # Create image library entry
        image_lib = ImageLibrary(
            name=name,
            slug=slug,
            description=description,
            alt_text=alt_text or name,
            category=category,
            tags=tags,
        )

        # Save the image
        filename = url.split("/")[-1]
        if "?" in filename:
            filename = filename.split("?")[0]

        image_lib.image.save(filename, ContentFile(response.content), save=True)

        print(f"Created image library entry from URL: {name}")
        return image_lib

    except Exception as e:
        print(f"Error creating image library entry from URL: {e}")
        return None


def get_image_by_slug(slug):
    """
    Get an image from the library by slug.

    Args:
        slug: Slug of the image

    Returns:
        ImageLibrary instance or None if not found
    """
    try:
        return ImageLibrary.objects.get(slug=slug)
    except ImageLibrary.DoesNotExist:
        return None


def get_images_by_category(category):
    """
    Get all images from a specific category.

    Args:
        category: Category name

    Returns:
        QuerySet of ImageLibrary instances
    """
    return ImageLibrary.objects.filter(category=category)


def get_images_by_tags(tags):
    """
    Get images that contain any of the specified tags.

    Args:
        tags: List of tags or comma-separated string

    Returns:
        QuerySet of ImageLibrary instances
    """
    if isinstance(tags, str):
        tags = [tag.strip() for tag in tags.split(",")]

    from django.db.models import Q

    query = Q()
    for tag in tags:
        query |= Q(tags__icontains=tag)

    return ImageLibrary.objects.filter(query).distinct()


def cleanup_unused_images():
    """
    Find and optionally clean up unused images from the library.

    Returns:
        List of ImageLibrary instances with usage_count = 0
    """
    unused_images = ImageLibrary.objects.filter(usage_count=0)

    print(f"Found {unused_images.count()} unused images:")
    for image in unused_images:
        print(f"  - {image.name} ({image.slug})")

    return unused_images


def optimize_image(image_library_instance, max_width=1920, max_height=1080, quality=85):
    """
    Optimize an image in the library by resizing and compressing.

    Args:
        image_library_instance: ImageLibrary instance
        max_width: Maximum width in pixels
        max_height: Maximum height in pixels
        quality: JPEG quality (1-100)

    Returns:
        bool: True if optimization was successful
    """
    try:
        if not image_library_instance.image:
            return False

        # Open the image
        with PILImage.open(image_library_instance.image.path) as img:
            # Calculate new dimensions while maintaining aspect ratio
            ratio = min(max_width / img.width, max_height / img.height)

            if ratio < 1:  # Only resize if image is larger than max dimensions
                new_width = int(img.width * ratio)
                new_height = int(img.height * ratio)

                # Resize the image
                img_resized = img.resize(
                    (new_width, new_height), PILImage.Resampling.LANCZOS
                )

                # Save the optimized image
                img_resized.save(
                    image_library_instance.image.path,
                    format="JPEG",
                    quality=quality,
                    optimize=True,
                )

                # Update the image properties
                image_library_instance._update_image_properties()

                print(f"Optimized image: {image_library_instance.name}")
                return True
            else:
                print(f"Image already optimal: {image_library_instance.name}")
                return True

    except Exception as e:
        print(f"Error optimizing image {image_library_instance.name}: {e}")
        return False