import gradio as gr
import torch
import torch.nn.functional as F
from facenet_pytorch import MTCNN, InceptionResnetV1
import os
import numpy as np
from PIL import Image
import zipfile
import cv2
from pytorch_grad_cam import GradCAM
from pytorch_grad_cam.utils.model_targets import ClassifierOutputTarget
from pytorch_grad_cam.utils.image import show_cam_on_image

#ai-pict-detect
from transformers import pipeline

pipe = pipeline("image-classification", "nightfury/AI-picture-detector")

def image_classifier(image):
    outputs = pipe(image)
    results = {}
    for result in outputs:
        results[result['label']] = result['score']
    return results
#ai-pict-detect


#gr.themes.Soft()
#gr.themes.builder()
    
with zipfile.ZipFile("examples.zip","r") as zip_ref:
    zip_ref.extractall(".")

DEVICE = 'cuda' if torch.cuda.is_available() else 'cpu'
'''cuda:0'''
mtcnn = MTCNN(
    select_largest=False,
    post_process=False,
    device=DEVICE
).to(DEVICE).eval()

model = InceptionResnetV1(
    pretrained="vggface2",
    classify=True,
    num_classes=1,
    device=DEVICE
)

checkpoint = torch.load("resnetinceptionv1_epoch_32.pth", map_location=torch.device('cpu'))
model.load_state_dict(checkpoint['model_state_dict'])
model.to(DEVICE)
model.eval()

EXAMPLES_FOLDER = 'examples'
examples_names = os.listdir(EXAMPLES_FOLDER)
examples = []
for example_name in examples_names:
    example_path = os.path.join(EXAMPLES_FOLDER, example_name)
    label = example_name.split('_')[0]
    example = {
        'path': example_path,
        'label': label
    }
    examples.append(example)
np.random.shuffle(examples) # shuffle

def predict(input_image:Image.Image, true_label:str):
    """Predict the label of the input_image"""
    face = mtcnn(input_image)
    if face is None:
        raise Exception('No face detected')
        return "No Photoreal face detected"
    face = face.unsqueeze(0) # add the batch dimension
    face = F.interpolate(face, size=(256, 256), mode='bilinear', align_corners=False)
    
    # convert the face into a numpy array to be able to plot it
    prev_face = face.squeeze(0).permute(1, 2, 0).cpu().detach().int().numpy()
    prev_face = prev_face.astype('uint8')

    face = face.to(DEVICE)
    face = face.to(torch.float32)
    face = face / 255.0
    face_image_to_plot = face.squeeze(0).permute(1, 2, 0).cpu().detach().int().numpy()

    target_layers=[model.block8.branch1[-1]]
    use_cuda = True if torch.cuda.is_available() else False
    #print ("Cuda :: ", use_cuda)
    cam = GradCAM(model=model, target_layers=target_layers) 
    #, use_cuda=use_cuda)
    targets = [ClassifierOutputTarget(0)]

    grayscale_cam = cam(input_tensor=face, targets=targets, eigen_smooth=True)
    grayscale_cam = grayscale_cam[0, :]
    visualization = show_cam_on_image(face_image_to_plot, grayscale_cam, use_rgb=True)
    face_with_mask = cv2.addWeighted(prev_face, 1, visualization, 0.5, 0)

    with torch.no_grad():
        output = torch.sigmoid(model(face).squeeze(0))
        prediction = "real" if output.item() < 0.5 else "fake"
        
        real_prediction = 1 - output.item()
        fake_prediction = output.item()
        
        confidences = {
            'real': real_prediction,
            'fake': fake_prediction
        }
    return confidences, true_label, face_with_mask

title = "Deepfake Image Detection"
description = "~ AI - ML implementation for fake and real image detection..."
article = "<p style='text-align: center'>...</p>"

#interface

interface1 = gr.Interface(
    fn=predict,
    inputs=[
        gr.inputs.Image(label="Input Image", type="pil"),
        "text"
    ],
    outputs=[
        gr.outputs.Label(label="Prediction Model - % of Fake or Real image detection"),
        "text",
        gr.outputs.Image(label="Face with Explainability", type="pil")
        #ValueError: Invalid value for parameter `type`: auto. Please choose from one of: ['numpy', 'pil', 'filepath']
    ],
    theme = gr.themes.Soft(),
    title = title,
    description = description,
    article = article
    #examples=[[examples[i]["path"], examples[i]["label"]] for i in range(10)]
)

title1 = "AI Generated Image Detection"
description1 = "~ AI - ML implementation for AI image detection using older models such as VQGAN+CLIP."
article1 = """
NOTE:
- To detect pictures generated using older models such as VQGAN+CLIP, please use the updated version of this detector instead.
- In this model i'm using a ViT model to predict whether an artistic image was generated using AI or not.
- The training dataset didn't include any samples generated from Midjourney 5, SDXL, or DALLE-3. But was trained on outputs of their predecessors.
- Scope of this tool is 'artistic images'; that is to say, it is not a deepfake photo detector, and general computer imagery (webcams, screenshots, etc.) may throw it off.
- The potential indicator for this tool is to serve to detect whether an image was AI-generated or not.
- Images scoring as very probably artificial (e.g. 90% or higher) could be referred to a human expert for further investigation, if needed.
"""

interface2 = gr.Interface(fn=image_classifier, inputs=gr.Image(type="pil"), outputs="label", title=title1, description=description1, article = article1)
#demo.launch(show_api=False)

'''
interface2 = gr.Interface(
    fn=image_classifier,
    inputs=[
        gr.inputs.Image(label="Input Image", type="pil"),
        "text"
    ],
    outputs=[
        gr.outputs.Label(label="Is it Artificial or Human"),
        "text",
        #ValueError: Invalid value for parameter `type`: auto. Please choose from one of: ['numpy', 'pil', 'filepath']
    ],
    
    theme = gr.themes.Soft(),
    title = title1,
    description = description1,
    article = article1
)
'''

gr.TabbedInterface(
    [interface1, interface2], ["Deepfake Image Detection", "AI Image Detection"]
).launch() #share=True)