import numpy as np
import mediapipe as mp

from PIL import Image
from mediapipe.tasks import python
from mediapipe.tasks.python import vision
from scipy.ndimage import binary_dilation
from croper import Croper

segment_model = "checkpoints/selfie_multiclass_256x256.tflite"
base_options = python.BaseOptions(model_asset_path=segment_model)
options = vision.ImageSegmenterOptions(base_options=base_options,output_category_mask=True)
segmenter = vision.ImageSegmenter.create_from_options(options)

def restore_result(croper, category, generated_image):
    square_length = croper.square_length
    generated_image = generated_image.resize((square_length, square_length))

    cropped_generated_image = generated_image.crop((croper.square_start_x, croper.square_start_y, croper.square_end_x, croper.square_end_y))
    cropped_square_mask_image = get_restore_mask_image(croper, category, cropped_generated_image)

    restored_image = croper.input_image.copy()
    restored_image.paste(cropped_generated_image, (croper.origin_start_x, croper.origin_start_y), cropped_square_mask_image)

    return restored_image

def segment_image(input_image, category, generate_size, mask_expansion, mask_dilation):
    mask_size = int(generate_size)
    mask_expansion = int(mask_expansion)

    image = mp.Image(image_format=mp.ImageFormat.SRGB, data=np.asarray(input_image))
    segmentation_result = segmenter.segment(image)
    category_mask = segmentation_result.category_mask
    category_mask_np = category_mask.numpy_view()

    if category == "hair":
        target_mask = get_hair_mask(category_mask_np, mask_dilation)
    elif category == "clothes":
        target_mask = get_clothes_mask(category_mask_np, mask_dilation)
    elif category == "face":
        target_mask = get_face_mask(category_mask_np, mask_dilation)
    else:
        target_mask = get_face_mask(category_mask_np, mask_dilation)
    
    croper = Croper(input_image, target_mask, mask_size, mask_expansion)
    croper.corp_mask_image()
    origin_area_image = croper.resized_square_image

    return origin_area_image, croper

def get_face_mask(category_mask_np, dilation=1):
    face_skin_mask = category_mask_np == 3
    if dilation > 0:
        face_skin_mask = binary_dilation(face_skin_mask, iterations=dilation)

    return face_skin_mask

def get_clothes_mask(category_mask_np, dilation=1):
    body_skin_mask = category_mask_np == 2
    clothes_mask = category_mask_np == 4
    combined_mask = np.logical_or(body_skin_mask, clothes_mask)
    combined_mask = binary_dilation(combined_mask, iterations=4)
    if dilation > 0:
        combined_mask = binary_dilation(combined_mask, iterations=dilation)
    return combined_mask

def get_hair_mask(category_mask_np, dilation=1):
    hair_mask = category_mask_np == 1
    if dilation > 0:
        hair_mask = binary_dilation(hair_mask, iterations=dilation)
    return hair_mask

def get_restore_mask_image(croper, category, generated_image):
    image = mp.Image(image_format=mp.ImageFormat.SRGB, data=np.asarray(generated_image))
    segmentation_result = segmenter.segment(image)
    category_mask = segmentation_result.category_mask
    category_mask_np = category_mask.numpy_view()

    if category == "hair":
        target_mask = get_hair_mask(category_mask_np, 0)
    elif category == "clothes":
        target_mask = get_clothes_mask(category_mask_np, 0)
    elif category == "face":
        target_mask = get_face_mask(category_mask_np, 0)
    
    combined_mask = np.logical_or(target_mask, croper.corp_mask)
    mask_image = Image.fromarray((combined_mask * 255).astype(np.uint8))
    return mask_image