import os
import random

import numpy as np
import PIL
from PIL import Image
from torch.utils.data import Dataset
from torchvision import transforms

imagenet_templates_smallest = [
    "a photo of a {}",
]

imagenet_templates_small = [
    "a photo of a {}",
    "a rendering of a {}",
    "a cropped photo of the {}",
    "the photo of a {}",
    "a photo of a clean {}",
    "a photo of a dirty {}",
    "a dark photo of the {}",
    "a photo of my {}",
    "a photo of the cool {}",
    "a close-up photo of a {}",
    "a bright photo of the {}",
    "a cropped photo of a {}",
    "a photo of the {}",
    "a good photo of the {}",
    "a photo of one {}",
    "a close-up photo of the {}",
    "a rendition of the {}",
    "a photo of the clean {}",
    "a rendition of a {}",
    "a photo of a nice {}",
    "a good photo of a {}",
    "a photo of the nice {}",
    "a photo of the small {}",
    "a photo of the weird {}",
    "a photo of the large {}",
    "a photo of a cool {}",
    "a photo of a small {}",
]

imagenet_dual_templates_small = [
    "a photo of a {} with {}",
    "a rendering of a {} with {}",
    "a cropped photo of the {} with {}",
    "the photo of a {} with {}",
    "a photo of a clean {} with {}",
    "a photo of a dirty {} with {}",
    "a dark photo of the {} with {}",
    "a photo of my {} with {}",
    "a photo of the cool {} with {}",
    "a close-up photo of a {} with {}",
    "a bright photo of the {} with {}",
    "a cropped photo of a {} with {}",
    "a photo of the {} with {}",
    "a good photo of the {} with {}",
    "a photo of one {} with {}",
    "a close-up photo of the {} with {}",
    "a rendition of the {} with {}",
    "a photo of the clean {} with {}",
    "a rendition of a {} with {}",
    "a photo of a nice {} with {}",
    "a good photo of a {} with {}",
    "a photo of the nice {} with {}",
    "a photo of the small {} with {}",
    "a photo of the weird {} with {}",
    "a photo of the large {} with {}",
    "a photo of a cool {} with {}",
    "a photo of a small {} with {}",
]

per_img_token_list = [
    "א",
    "ב",
    "ג",
    "ד",
    "ה",
    "ו",
    "ז",
    "ח",
    "ט",
    "י",
    "כ",
    "ל",
    "מ",
    "נ",
    "ס",
    "ע",
    "פ",
    "צ",
    "ק",
    "ר",
    "ש",
    "ת",
]


class PersonalizedBase(Dataset):
    def __init__(
        self,
        data_root,
        size=None,
        repeats=100,
        interpolation="bicubic",
        flip_p=0.5,
        set="train",
        placeholder_token="*",
        per_image_tokens=False,
        center_crop=False,
        mixing_prob=0.25,
        coarse_class_text=None,
    ):
        self.data_root = data_root

        self.image_paths = [
            os.path.join(self.data_root, file_path)
            for file_path in os.listdir(self.data_root)
            if file_path != ".DS_Store"
        ]

        # self._length = len(self.image_paths)
        self.num_images = len(self.image_paths)
        self._length = self.num_images

        self.placeholder_token = placeholder_token

        self.per_image_tokens = per_image_tokens
        self.center_crop = center_crop
        self.mixing_prob = mixing_prob

        self.coarse_class_text = coarse_class_text

        if per_image_tokens:
            assert self.num_images < len(
                per_img_token_list
            ), f"Can't use per-image tokens when the training set contains more than {len(per_img_token_list)} tokens. To enable larger sets, add more tokens to 'per_img_token_list'."

        if set == "train":
            self._length = self.num_images * repeats

        self.size = size
        self.interpolation = {
            "linear": PIL.Image.LINEAR,
            "bilinear": PIL.Image.BILINEAR,
            "bicubic": PIL.Image.BICUBIC,
            "lanczos": PIL.Image.LANCZOS,
        }[interpolation]
        self.flip = transforms.RandomHorizontalFlip(p=flip_p)

    def __len__(self):
        return self._length

    def __getitem__(self, i):
        example = {}
        image = Image.open(self.image_paths[i % self.num_images])

        if not image.mode == "RGB":
            image = image.convert("RGB")

        placeholder_string = self.placeholder_token
        if self.coarse_class_text:
            placeholder_string = f"{self.coarse_class_text} {placeholder_string}"

        if self.per_image_tokens and np.random.uniform() < self.mixing_prob:
            text = random.choice(imagenet_dual_templates_small).format(
                placeholder_string, per_img_token_list[i % self.num_images]
            )
        else:
            text = random.choice(imagenet_templates_small).format(placeholder_string)

        example["caption"] = text

        # default to score-sde preprocessing
        img = np.array(image).astype(np.uint8)

        if self.center_crop:
            crop = min(img.shape[0], img.shape[1])
            (
                h,
                w,
            ) = (
                img.shape[0],
                img.shape[1],
            )
            img = img[
                (h - crop) // 2 : (h + crop) // 2,
                (w - crop) // 2 : (w + crop) // 2,
            ]

        image = Image.fromarray(img)
        if self.size is not None:
            image = image.resize((self.size, self.size), resample=self.interpolation)

        image = self.flip(image)
        image = np.array(image).astype(np.uint8)
        example["image"] = (image / 127.5 - 1.0).astype(np.float32)
        return example