from PIL import Image as PILImage
from transformers import AutoModel, AutoTokenizer, AutoImageProcessor
import re
import cv2
import numpy as np


class Utils():
    def xywh2xyxy(b):
        b[..., 2:] += b[..., :2]
        return b
    
    def bbox_to_sbbox(bbox):
        # xyxy in [0, 1]
        assert len(bbox) == 4
        bbox = (np.asarray(bbox) * 1000).astype(np.int16)
        bbox = np.clip(bbox, 0, 999)
        bbox = " ".join([f"<bin_{i}>" for i in bbox])
        return bbox
        
    def sbbox_to_bbox(sbbox, set_default: bool = False):
        sbbox = [re.findall(r"<bin_(\d+)>", s)[:4] for s in sbbox.split("region:")]
        bbox = np.asarray([s for s in sbbox if len(s) >= 4], dtype=int)
        if set_default and not len(bbox):
            bbox = np.asarray([0, 0, 1000, 1000])
        bbox = np.clip(bbox / 1000, 1e-5, 1 - 1e-5)
        return bbox.reshape(-1, 4)

    def make_dialog_context(dialog: list, text_human: str = None) -> str:
        # dialog: [("pass me an apple.", "which apple do you want?"), ...]
        context = "".join([f"human: {d[0]}\nagent: {d[1]}\n" for d in dialog])
        if text_human is not None:
            context += f"human: {text_human}"
        return context
    
    def show_mask(image: PILImage.Image, bboxes=None, masks=None, show_id=False, text_size=1) -> PILImage.Image:
        """ 给图片画上mask: 只更改被mask标记部分的rgb值. """
        import colorsys
        colors = [tuple(int(c * 255) for c in colorsys.hsv_to_rgb(i * 1.0 / 36, 1, 1)) for i in range(36)] 
        size = image.size
        image = np.asarray(image)
        if bboxes is not None:
            bboxes = np.array(bboxes).reshape(-1, 4)
            for k, bbox in enumerate(bboxes):
                bbox = (np.asarray(bbox) * np.asarray([*size, *size])).astype(int)
                image = cv2.rectangle(image, tuple(bbox[:2]), tuple(bbox[2:]), tuple(colors[k]), thickness=2)
            if show_id:
                for k, bbox in enumerate(bboxes):
                    bbox = (np.asarray(bbox) * np.asarray([*size, *size])).astype(int)
                    image = cv2.putText(image, str(k), tuple(bbox[:2] + np.array([2, 28 * text_size])), cv2.FONT_HERSHEY_SIMPLEX, text_size, (255, 255, 255), 2, cv2.LINE_AA)
                    image = cv2.putText(image, str(k), tuple(bbox[:2] + np.array([2, 28 * text_size])), cv2.FONT_HERSHEY_SIMPLEX, text_size, tuple(colors[k%len(colors)]), 1, cv2.LINE_AA)

        if masks is not None:
            for k, mask in enumerate(masks):
                mask_color = (mask[..., None] * colors[k%len(colors)][:3]).astype(np.uint8)
                image_mask = cv2.addWeighted(mask_color, 0.5, image * mask[..., None], 0.5, 0)
                image = cv2.add(image * ~mask[..., None], image_mask)
        return PILImage.fromarray(image)