from typing import Optional, Type, List, Dict, Any
import hashlib
import base64
import io
import os

from PIL import Image
import torch
from torchvision import transforms


def generate_text_id(text):
    return hashlib.md5(text.encode('utf-8')).hexdigest()


def get_file_hash(file_path):
    with open(file_path, 'rb') as f:
        return hashlib.md5(f.read()).hexdigest()


def resize_image(img, max_size=512):
    """调整图片大小，保持原始比例，使长宽均不超过max_size，并保存到output_path"""
    width, height = img.size
    if width > max_size or height > max_size:
        # 保持图片的宽高比
        if width > height:
            new_width = max_size
            new_height = int(max_size * height / width)
        else:
            new_height = max_size
            new_width = int(max_size * width / height)

        # 进行图片缩放
        img_resized = img.resize((new_width, new_height), Image.LANCZOS)
    else:
        img_resized = img.copy()  # 如果图片本身符合条件，则不进行缩放

    return img_resized


def base64_encode_image(image_path):
    try:
        image_path = image_path.replace("\\", "/")

        with Image.open(image_path) as img:
            # 如果图像模式不是 RGB，转换为 RGB
            if img.mode != 'RGB':
                img = img.convert('RGB')
            # 获取当前图片的宽和高
            img_resized = resize_image(img)
            # 将PIL Image对象编码为base64字符串。
            buffered = io.BytesIO()
            img_resized.save(buffered, format="JPEG")  # 保存调整后的图像到内存流
            return base64.b64encode(buffered.getvalue()).decode("utf-8")
    except FileNotFoundError as e:
        print(f"File not found: {image_path}")
        print(f"Absolute path: {os.path.abspath(image_path)}")
        print(f"Current working directory: {os.getcwd()}")
        return None
    except Exception as e:
        print(f"Error processing image {image_path}: {str(e)}")
        return None


def get_possible_image_paths(path):
    image_path = path.split(".")
    # Image path might contain file extension (e.g. .jpg),
    # In this case, we want the path without the extension
    image_path = image_path if len(image_path) == 1 else image_path[:-1]
    for ext in (".jpg", ".jpeg", ".png", ".ppm", ".bmp", ".pgm", ".tif", ".tiff", ".webp"):
        image_ext = ".".join(image_path) + ext
        if os.path.isfile(image_ext):
            path = image_ext
            break
    return path


def preprocess(image_urls: List[str]):
    transform_pipeline = transforms.Compose([
        # 缩放图像尺寸到 256x256
        transforms.Resize((256, 256)),
        # 从图像中心裁剪 224x224
        transforms.CenterCrop(224),
        # 将 PIL 图像或 NumPy ndarray 转换为 FloatTensor
        transforms.ToTensor(),
        # 对图像进行标准化
        transforms.Normalize(mean=[0.48145466, 0.4578275, 0.40821073],
                             std=[0.26862954, 0.26130258, 0.27577711])
    ])
    image_data = []
    if len(image_urls) == 0:
        return None
    for url in image_urls:
        path = get_possible_image_paths(url)
        try:
            image = Image.open(path).convert("RGB")
        except FileNotFoundError as e:
            print(f"File not found: {path}, {e}")
            continue
        image_tensor = transform_pipeline(image)
        image_data.append(image_tensor)
    image_data = torch.stack(image_data, dim=0)
    return image_data.numpy()


def is_image_accessible(path: str) -> bool:
    if not os.path.exists(path):
        return False
    try:
        with Image.open(path) as img:
            img.verify()  # 验证图像文件
        return True
    except (IOError, SyntaxError):
        return False

def create_image_grid(image_paths, grid_size=(2, 2)):
    # 打开所有图片
    images = [Image.open(path) for path in image_paths]

    # 确定每个图片的大小
    max_width = max(img.width for img in images)
    max_height = max(img.height for img in images)

    # 创建一个新的空白图片
    grid_width = grid_size[0] * max_width
    grid_height = grid_size[1] * max_height
    grid_image = Image.new('RGB', (grid_width, grid_height), color="white")

    # 将图片粘贴到网格中
    for i, img in enumerate(images):
        x = (i % grid_size[0]) * max_width
        y = (i // grid_size[0]) * max_height

        # 计算缩放比例，保持原始宽高比
        ratio = min(max_width / img.width, max_height / img.height)
        new_size = (int(img.width * ratio), int(img.height * ratio))

        # 调整大小并保持宽高比
        img_resized = img.resize(new_size, Image.LANCZOS)

        # 计算居中位置
        paste_x = x + (max_width - new_size[0]) // 2
        paste_y = y + (max_height - new_size[1]) // 2

        # 粘贴到网格中
        grid_image.paste(img_resized, (paste_x, paste_y))

    # 将图片转换为字节流
    img_byte_arr = io.BytesIO()
    grid_image.save(img_byte_arr, format='PNG')
    img_byte_arr = img_byte_arr.getvalue()
    return img_byte_arr