from __future__ import annotations

import os
import re
import io
import base64
from io import BytesIO
from pathlib import Path
from typing import Optional
try:
    from PIL.Image import open as open_image, new as new_image
    from PIL.Image import FLIP_LEFT_RIGHT, ROTATE_180, ROTATE_270, ROTATE_90
    has_requirements = True
except ImportError:
    has_requirements = False

from ..typing import ImageType, Union, Image
from ..errors import MissingRequirementsError

EXTENSIONS_MAP: dict[str, str] = {
    # Image
    "png": "image/png",
    "jpg": "image/jpeg",
    "jpeg": "image/jpeg",
    "gif": "image/gif",
    "webp": "image/webp",
    # Audio
    "wav": "audio/wav",
    "mp3": "audio/mpeg",
    "flac": "audio/flac",
    "opus": "audio/opus",
    "ogg": "audio/ogg",
    "m4a": "audio/m4a",
     # Video
    "mkv": "video/x-matroska",
    "webm": "video/webm",
    "mp4": "video/mp4",
}

MEDIA_TYPE_MAP: dict[str, str] = {value: key for key, value in EXTENSIONS_MAP.items()}

def to_image(image: ImageType, is_svg: bool = False) -> Image:
    """
    Converts the input image to a PIL Image object.

    Args:
        image (Union[str, bytes, Image]): The input image.

    Returns:
        Image: The converted PIL Image object.
    """
    if not has_requirements:
        raise MissingRequirementsError('Install "pillow" package for images')

    if isinstance(image, str) and image.startswith("data:"):
        is_data_uri_an_image(image)
        image = extract_data_uri(image)

    if is_svg:
        try:
            import cairosvg
        except ImportError:
            raise MissingRequirementsError('Install "cairosvg" package for svg images')
        if not isinstance(image, bytes):
            image = image.read()
        buffer = BytesIO()
        cairosvg.svg2png(image, write_to=buffer)
        return open_image(buffer)

    if isinstance(image, bytes):
        is_accepted_format(image)
        return open_image(BytesIO(image))
    elif not isinstance(image, Image):
        image = open_image(image)
        image.load()
        return image

    return image

def get_extension(filename: str) -> Optional[str]:
    if '.' in filename:
        ext = os.path.splitext(filename)[1][1:].lower()
        return ext if ext in EXTENSIONS_MAP else None
    return None

def is_allowed_extension(filename: str) -> Optional[str]:
    """
    Checks if the given filename has an allowed extension.

    Args:
        filename (str): The filename to check.

    Returns:
        bool: True if the extension is allowed, False otherwise.
    """
    extension = get_extension(filename)
    if extension is None:
        return None
    return EXTENSIONS_MAP[extension]

def is_data_an_media(data, filename: str = None) -> str:
    content_type = is_data_an_audio(data, filename)
    if content_type is not None:
        return content_type
    if isinstance(data, bytes):
        return is_accepted_format(data)
    return is_data_uri_an_image(data)

def is_data_an_audio(data_uri: str = None, filename: str = None) -> str:
    if filename:
        extension = get_extension(filename)
        if extension is not None:
            media_type = EXTENSIONS_MAP[extension]
            if media_type.startswith("audio/"):
                return media_type
    if isinstance(data_uri, str):
        audio_format = re.match(r'^data:(audio/\w+);base64,', data_uri)
        if audio_format:
            return audio_format.group(1)

def is_data_uri_an_image(data_uri: str) -> bool:
    """
    Checks if the given data URI represents an image.

    Args:
        data_uri (str): The data URI to check.

    Raises:
        ValueError: If the data URI is invalid or the image format is not allowed.
    """
    # Check if the data URI starts with 'data:image' and contains an image format (e.g., jpeg, png, gif)
    if not re.match(r'data:image/(\w+);base64,', data_uri):
        raise ValueError("Invalid data URI image.")
    # Extract the image format from the data URI
    image_format = re.match(r'data:image/(\w+);base64,', data_uri).group(1).lower()
    # Check if the image format is one of the allowed formats (jpg, jpeg, png, gif)
    if image_format not in EXTENSIONS_MAP and image_format != "svg+xml":
        raise ValueError("Invalid image format (from mime file type).")

def is_accepted_format(binary_data: bytes) -> str:
    """
    Checks if the given binary data represents an image with an accepted format.

    Args:
        binary_data (bytes): The binary data to check.

    Raises:
        ValueError: If the image format is not allowed.
    """
    if binary_data.startswith(b'\xFF\xD8\xFF'):
        return "image/jpeg"
    elif binary_data.startswith(b'\x89PNG\r\n\x1a\n'):
        return "image/png"
    elif binary_data.startswith(b'GIF87a') or binary_data.startswith(b'GIF89a'):
        return "image/gif"
    elif binary_data.startswith(b'\x89JFIF') or binary_data.startswith(b'JFIF\x00'):
        return "image/jpeg"
    elif binary_data.startswith(b'\xFF\xD8'):
        return "image/jpeg"
    elif binary_data.startswith(b'RIFF') and binary_data[8:12] == b'WEBP':
        return "image/webp"
    else:
        raise ValueError("Invalid image format (from magic code).")

def extract_data_uri(data_uri: str) -> bytes:
    """
    Extracts the binary data from the given data URI.

    Args:
        data_uri (str): The data URI.

    Returns:
        bytes: The extracted binary data.
    """
    data = data_uri.split(",")[-1]
    data = base64.b64decode(data)
    return data

def get_orientation(image: Image) -> int:
    """
    Gets the orientation of the given image.

    Args:
        image (Image): The image.

    Returns:
        int: The orientation value.
    """
    exif_data = image.getexif() if hasattr(image, 'getexif') else image._getexif()
    if exif_data is not None:
        orientation = exif_data.get(274) # 274 corresponds to the orientation tag in EXIF
        if orientation is not None:
            return orientation

def process_image(image: Image, new_width: int, new_height: int) -> Image:
    """
    Processes the given image by adjusting its orientation and resizing it.

    Args:
        image (Image): The image to process.
        new_width (int): The new width of the image.
        new_height (int): The new height of the image.

    Returns:
        Image: The processed image.
    """
    # Fix orientation
    orientation = get_orientation(image)
    if orientation:
        if orientation > 4:
            image = image.transpose(FLIP_LEFT_RIGHT)
        if orientation in [3, 4]:
            image = image.transpose(ROTATE_180)
        if orientation in [5, 6]:
            image = image.transpose(ROTATE_270)
        if orientation in [7, 8]:
            image = image.transpose(ROTATE_90)
    # Resize image
    image.thumbnail((new_width, new_height))
    # Remove transparency
    if image.mode == "RGBA":
        image.load()
        white = new_image('RGB', image.size, (255, 255, 255))
        white.paste(image, mask=image.split()[-1])
        return white
    # Convert to RGB for jpg format
    elif image.mode != "RGB":
        image = image.convert("RGB")
    return image

def to_bytes(image: ImageType) -> bytes:
    """
    Converts the given image to bytes.

    Args:
        image (ImageType): The image to convert.

    Returns:
        bytes: The image as bytes.
    """
    if isinstance(image, bytes):
        return image
    elif isinstance(image, str) and image.startswith("data:"):
        is_data_an_media(image)
        return extract_data_uri(image)
    elif isinstance(image, Image):
        bytes_io = BytesIO()
        image.save(bytes_io, image.format)
        image.seek(0)
        return bytes_io.getvalue()
    elif isinstance(image, (str, os.PathLike)):
        return Path(image).read_bytes()
    elif isinstance(image, Path):
        return image.read_bytes()
    else:
        try:
            image.seek(0)
        except (AttributeError, io.UnsupportedOperation):
            pass
        return image.read()

def to_data_uri(image: ImageType, filename: str = None) -> str:
    if not isinstance(image, str):
        data = to_bytes(image)
        data_base64 = base64.b64encode(data).decode()
        return f"data:{is_data_an_media(data, filename)};base64,{data_base64}"
    return image

def to_input_audio(audio: ImageType, filename: str = None) -> str:
    if not isinstance(audio, str):
        if filename is not None:
            format = get_extension(filename)
            if format is None:
                raise ValueError("Invalid input audio")
            return {
                "data": base64.b64encode(to_bytes(audio)).decode(),
                "format": format
            }
        raise ValueError("Invalid input audio")
    audio = re.match(r'^data:audio/(\w+);base64,(.+?)', audio)
    if audio:
        return {
            "data": audio.group(2),
            "format": audio.group(1).replace("mpeg", "mp3")
        }
    raise ValueError("Invalid input audio")

def use_aspect_ratio(extra_data: dict, aspect_ratio: str) -> Image:
    extra_data = {key: value for key, value in extra_data.items() if value is not None}
    if aspect_ratio == "1:1":
        extra_data = {
            "width": 1024,
            "height": 1024,
            **extra_data
        }
    elif aspect_ratio == "16:9":
        extra_data = {
            "width": 832,
            "height": 480,
            **extra_data
        }
    elif aspect_ratio == "9:16":
        extra_data = {
            "width": 480,
            "height": 832,
            **extra_data
        }
    return extra_data

class ImageDataResponse():
    def __init__(
        self,
        images: Union[str, list],
        alt: str,
    ):
        self.images = images
        self.alt = alt

    def get_list(self) -> list[str]:
        return [self.images] if isinstance(self.images, str) else self.images

class ImageRequest:
    def __init__(
        self,
        options: dict = {}
    ):
        self.options = options

    def get(self, key: str):
        return self.options.get(key)