import os
import torch
import gradio as gr
import torchvision
from PIL import Image
from utils import *
import torch.nn as nn
import torch.nn.functional as F
import torch.optim as optim
from huggingface_hub import Repository, upload_file
from torch.utils.data import Dataset
import numpy as np
from collections import Counter 


with open('app.css','r') as f:
    BLOCK_CSS = f.read() 

n_epochs = 10
batch_size_train = 128
batch_size_test = 1000
learning_rate = 0.01
momentum = 0.5
log_interval = 10
random_seed = 1
TRAIN_CUTOFF = 10
WHAT_TO_DO=WHAT_TO_DO.format(num_samples=TRAIN_CUTOFF)
METRIC_PATH = './metrics.json'
REPOSITORY_DIR = "data"
LOCAL_DIR = 'data_local'
os.makedirs(LOCAL_DIR,exist_ok=True)




HF_TOKEN = os.getenv("HF_TOKEN")

HF_DATASET ="mnist-adversarial-dataset"
DATASET_REPO_URL = f"https://huggingface.co/datasets/chrisjay/{HF_DATASET}"
repo = Repository(
    local_dir="data_mnist", clone_from=DATASET_REPO_URL, use_auth_token=HF_TOKEN
)
repo.git_pull()

torch.backends.cudnn.enabled = False
torch.manual_seed(random_seed)


class MNISTAdversarial_Dataset(Dataset):

    def __init__(self,data_dir,transform):
        repo.git_pull()
        self.data_dir = os.path.join(data_dir,'data')
        self.transform = transform
        files = [f.name for f in os.scandir(self.data_dir)]
        self.images = []
        self.numbers = []
        for f in files:
            self.FOLDER = os.path.join(os.path.join(self.data_dir,f))
            
            metadata_path = os.path.join(self.FOLDER,'metadata.jsonl')

            image_path =os.path.join(self.FOLDER,'image.png')
            if os.path.exists(image_path) and os.path.exists(metadata_path): 
                img = Image.open(image_path)
                self.images.append(img)
                metadata = read_json_lines(metadata_path)
                self.numbers.append(metadata[0]['correct_number'])
        assert len(self.images)==len(self.numbers), f"Length of images and numbers must be the same. Got {len(self.images)} for images and {len(self.numbers)} for numbers."
    def __len__(self):
        return len(self.images)
    
    def __getitem__(self,idx):
        img, label = self.images[idx], self.numbers[idx]
        img = self.transform(img)
        return img, label

class MNISTCorrupted_By_Digit(Dataset):
    def __init__(self,transform,digit,limit=300):
        self.transform = transform
        self.digit = digit
        corrupted_dir="./mnist_c"
        files = [f.name for f in os.scandir(corrupted_dir)]
        images = [np.load(os.path.join(os.path.join(corrupted_dir,f),'test_images.npy')) for f in files]
        labels = [np.load(os.path.join(os.path.join(corrupted_dir,f),'test_labels.npy')) for f in files]
        self.data = np.vstack(images)
        self.labels = np.hstack(labels)
        
        assert (self.data.shape[0] == self.labels.shape[0])
        
        mask = self.labels == self.digit

        data_masked  = self.data[mask] 
        # Just to be on the safe side, ensure limit is more than the minimum
        limit = min(limit,data_masked.shape[0])

        self.data_for_use = data_masked[:limit]
        self.labels_for_use = self.labels[mask][:limit]
        assert (self.data_for_use.shape[0] == self.labels_for_use.shape[0])

    def __len__(self):
        return len(self.data_for_use)
    def __getitem__(self,idx):
        if torch.is_tensor(idx):
            idx = idx.tolist()

        image = self.data_for_use[idx]
        label = self.labels_for_use[idx]
        if self.transform:
            image_pil = torchvision.transforms.ToPILImage()(image) # Need to transform to PIL before using default transforms
            image = self.transform(image_pil) 

        return image, label



class MNISTCorrupted(Dataset):
    def __init__(self,transform):
        self.transform = transform
        corrupted_dir="./mnist_c"
        files = [f.name for f in os.scandir(corrupted_dir)]
        images = [np.load(os.path.join(os.path.join(corrupted_dir,f),'test_images.npy'))[:300] for f in files]
        labels = [np.load(os.path.join(os.path.join(corrupted_dir,f),'test_labels.npy'))[:300] for f in files]
        self.data = np.vstack(images)
        self.labels = np.hstack(labels)

        assert (self.data.shape[0] == self.labels.shape[0])

    def __len__(self):
        return len(self.data)

    def __getitem__(self, idx):
        if torch.is_tensor(idx):
            idx = idx.tolist()

        image = self.data[idx]
        label = self.labels[idx]
        if self.transform:
            image_pil = torchvision.transforms.ToPILImage()(image) # Need to transform to PIL before using default transforms
            image = self.transform(image_pil) 

        return image, label



TRAIN_TRANSFORM = torchvision.transforms.Compose([
                               torchvision.transforms.ToTensor(),
                               torchvision.transforms.Normalize(
                                 (0.1307,), (0.3081,))
                             ])


test_loader = torch.utils.data.DataLoader(MNISTCorrupted(TRAIN_TRANSFORM),
                                            batch_size=batch_size_test, shuffle=False)


# Source: https://nextjournal.com/gkoehler/pytorch-mnist
class MNIST_Model(nn.Module):
    def __init__(self):
        super(MNIST_Model, self).__init__()
        self.conv1 = nn.Conv2d(1, 10, kernel_size=5)
        self.conv2 = nn.Conv2d(10, 20, kernel_size=5)
        self.conv2_drop = nn.Dropout2d()
        self.fc1 = nn.Linear(320, 50)
        self.fc2 = nn.Linear(50, 10)

    def forward(self, x):
        x = F.relu(F.max_pool2d(self.conv1(x), 2))
        x = F.relu(F.max_pool2d(self.conv2_drop(self.conv2(x)), 2))
        x = x.view(-1, 320)
        x = F.relu(self.fc1(x))
        x = F.dropout(x, training=self.training)
        x = self.fc2(x)
        return F.log_softmax(x)


def train(epochs,network,optimizer,train_loader):
    
    train_losses=[]
    network.train()
    for epoch in range(epochs):
        for batch_idx, (data, target) in enumerate(train_loader):
            optimizer.zero_grad()
            output = network(data)
            loss = F.nll_loss(output, target)
            loss.backward()
            optimizer.step()
            if batch_idx % log_interval == 0:
                print('Train Epoch: {} [{}/{} ({:.0f}%)]\tLoss: {:.6f}'.format(
                epoch, batch_idx * len(data), len(train_loader.dataset),
                100. * batch_idx / len(train_loader), loss.item()))
                train_losses.append(loss.item())
        
                torch.save(network.state_dict(), 'model.pth')
                torch.save(optimizer.state_dict(), 'optimizer.pth')

def test():
    test_losses=[]
    network.eval()
    test_loss = 0
    correct = 0
    with torch.no_grad():
        for data, target in test_loader:
            output = network(data)
            test_loss += F.nll_loss(output, target, size_average=False).item()
            pred = output.data.max(1, keepdim=True)[1]
            correct += pred.eq(target.data.view_as(pred)).sum()
            test_loss /= len(test_loader.dataset)
        test_losses.append(test_loss)
        acc = 100. * correct / len(test_loader.dataset)
        acc = acc.item()
        test_metric = '〽Current test metric -> Avg. loss: `{:.4f}`, Accuracy: `{:.0f}%`\n'.format(
        test_loss,acc)
        return test_metric,acc



random_seed = 1
torch.backends.cudnn.enabled = False
torch.manual_seed(random_seed)

network = MNIST_Model()
optimizer = optim.SGD(network.parameters(), lr=learning_rate,
                      momentum=momentum)        


model_state_dict = 'model.pth'
optimizer_state_dict = 'optmizer.pth'

if os.path.exists(model_state_dict):
    network_state_dict = torch.load(model_state_dict)
    network.load_state_dict(network_state_dict)

if os.path.exists(optimizer_state_dict):
    optimizer_state_dict = torch.load(optimizer_state_dict)
    optimizer.load_state_dict(optimizer_state_dict)                      



# Train
#train(n_epochs,network,optimizer)


def image_classifier(inp):
    """
    It takes an image as input and returns a dictionary of class labels and their corresponding
    confidence scores.
    
    :param inp: the image to be classified
    :return: A dictionary of the class index and the confidence value.
    """
    input_image = torchvision.transforms.ToTensor()(inp).unsqueeze(0)
    with torch.no_grad():

        prediction = torch.nn.functional.softmax(network(input_image)[0], dim=0)
        #pred_number = prediction.data.max(1, keepdim=True)[1]
        sorted_prediction = torch.sort(prediction,descending=True)
        confidences={}
        for s,v in zip(sorted_prediction.indices.numpy().tolist(),sorted_prediction.values.numpy().tolist()):
            confidences.update({s:v})
        return confidences

def train_and_test():
    # Train for one epoch and test
    train_dataset = MNISTAdversarial_Dataset('./data_mnist',TRAIN_TRANSFORM)

    train_loader = torch.utils.data.DataLoader(train_dataset,batch_size=batch_size_test, shuffle=True
                                             )
    train(n_epochs,network,optimizer,train_loader)
    test_metric,test_acc = test()

    if os.path.exists(METRIC_PATH):
        metric_dict = read_json(METRIC_PATH)
        metric_dict['all'] = metric_dict['all'] if 'all' in metric_dict else [] + [test_acc]
    else:
        metric_dict={}
        metric_dict['all'] = [test_acc] 

    for i in range(10):
        data_per_digit = MNISTCorrupted_By_Digit(TRAIN_TRANSFORM,i)
        dataloader_per_digit = torch.utils.data.DataLoader(data_per_digit,batch_size=len(data_per_digit), shuffle=False)
        data_per_digit, label_per_digit = iter(dataloader_per_digit).next()
        output = network(data_per_digit)
        pred = output.data.max(1, keepdim=True)[1]
        correct = pred.eq(label_per_digit.data.view_as(pred)).sum()
        acc = 100. * correct / len(data_per_digit)
        acc=acc.item()
        if os.path.exists(METRIC_PATH):
            metric_dict[str(i)].append(acc) 
        else:
            metric_dict[str(i)] = [acc] 

    dump_json(thing=metric_dict,file=METRIC_PATH)    
    return test_metric

def flag(input_image,correct_result,adversarial_number):

    adversarial_number = 0 if None else adversarial_number

    metadata_name = get_unique_name()
    SAVE_FILE_DIR = os.path.join(LOCAL_DIR,metadata_name)
    os.makedirs(SAVE_FILE_DIR,exist_ok=True)
    image_output_filename = os.path.join(SAVE_FILE_DIR,'image.png')
    try:
        input_image.save(image_output_filename)
    except Exception:
        raise Exception(f"Had issues saving PIL image to file")    

    # Write metadata.json to file
    json_file_path = os.path.join(SAVE_FILE_DIR,'metadata.jsonl')
    metadata= {'id':metadata_name,'file_name':'image.png',
                'correct_number':correct_result
                }
    
    dump_json(metadata,json_file_path)  
        
    # Simply upload the image file and metadata using the hub's upload_file
    # Upload the image
    repo_image_path = os.path.join(REPOSITORY_DIR,os.path.join(metadata_name,'image.png'))
    
    _ = upload_file(path_or_fileobj = image_output_filename,
                path_in_repo =repo_image_path,
                repo_id=f'chrisjay/{HF_DATASET}',
                repo_type='dataset',
                token=HF_TOKEN
            ) 

    # Upload the metadata
    repo_json_path = os.path.join(REPOSITORY_DIR,os.path.join(metadata_name,'metadata.jsonl'))
    _ = upload_file(path_or_fileobj = json_file_path,
                path_in_repo =repo_json_path,
                repo_id=f'chrisjay/{HF_DATASET}',
                repo_type='dataset',
                token=HF_TOKEN
            )        
    adversarial_number+=1
    output = f'<div> ✔ ({adversarial_number}) Successfully saved your adversarial data. </div>'
    repo.git_pull()
    length_of_dataset = len([f for f in os.scandir("./data_mnist/data")])
    test_metric = f"<html> {DEFAULT_TEST_METRIC} </html>"
    if length_of_dataset % TRAIN_CUTOFF ==0:
        test_metric_ = train_and_test()
        test_metric = f"<html> {test_metric_} </html>"
        output = f'<div> ✔ ({adversarial_number}) Successfully saved your adversarial data and trained the model on adversarial data! </div>'
    return output,adversarial_number

def get_number_dict(DATA_DIR):
    files = [f.name for f in os.scandir(DATA_DIR)]
    numbers = [read_json_lines(os.path.join(os.path.join(DATA_DIR,f),'metadata.jsonl'))[0]['correct_number'] for f in files]
    numbers_count = Counter(numbers)
    numbers_count_keys = list(numbers_count.keys())
    numbers_count_values = [numbers_count[k] for k in numbers_count_keys]
    return numbers_count_keys,numbers_count_values



def get_statistics():
    model_state_dict = 'model.pth'
    optimizer_state_dict = 'optmizer.pth'

    if os.path.exists(model_state_dict):
        network_state_dict = torch.load(model_state_dict)
        network.load_state_dict(network_state_dict)

    if os.path.exists(optimizer_state_dict):
        optimizer_state_dict = torch.load(optimizer_state_dict)
        optimizer.load_state_dict(optimizer_state_dict)                      
    repo.git_pull()
    DATA_DIR = './data_mnist/data'
    numbers_count_keys,numbers_count_values = get_number_dict(DATA_DIR)

    STATS_EXPLANATION_ = STATS_EXPLANATION.format(num_adv_samples = sum(numbers_count_values))
    
    plt_digits = plot_bar(numbers_count_values,numbers_count_keys,'Number of adversarial samples',"Digit",f"Distribution of adversarial samples over digits")
    
    fig_d, ax_d = plt.subplots(tight_layout=True)

    if os.path.exists(METRIC_PATH):
        metric_dict = read_json(METRIC_PATH)
        for i in range(10):
            try:    
                x_i = [i+1 for i in range(len(metric_dict[str(i)]))]
                ax_d.plot(x_i, metric_dict[str(i)],label=str(i))
            except Exception:
                continue
        dump_json(thing=metric_dict,file=METRIC_PATH)    
    else:
        metric_dict={}

    fig_d.legend()
    ax_d.set(xlabel='Adversarial train steps', ylabel='MNIST_C Test Accuracy',title="Test Accuracy over digits per train step")

    done_html =  """<div style="color: green">
                <p> ✅ Statistics loaded successfully!</p>
                </div>
               """ 

    return plt_digits,fig_d,done_html,STATS_EXPLANATION_    




def main():
    block = gr.Blocks(css=BLOCK_CSS)

    with block:
        gr.Markdown(TITLE)
        gr.Markdown(description)

        with gr.Tabs():
            with gr.TabItem('MNIST'):
                gr.Markdown(WHAT_TO_DO)
                #test_metric = gr.outputs.HTML("")
                with gr.Row():     
            

                    image_input =gr.inputs.Image(source="canvas",shape=(28,28),invert_colors=True,image_mode="L",type="pil")
                    label_output = gr.outputs.Label(num_top_classes=2)


                submit = gr.Button("Submit")
                
                gr.Markdown(MODEL_IS_WRONG)
                
                number_dropdown = gr.Dropdown(choices=[i for i in range(10)],type='value',default=None,label="What was the correct prediction?") 


                flag_btn = gr.Button("Flag")

                output_result = gr.outputs.HTML()
                adversarial_number = gr.Variable(value=0)


                submit.click(image_classifier,inputs = [image_input],outputs=[label_output])
                flag_btn.click(flag,inputs=[image_input,number_dropdown,adversarial_number],outputs=[output_result,adversarial_number])
                
            with gr.TabItem('Dashboard') as dashboard:
                notification = gr.HTML("""<div style="color: green">
                                        <p> ⌛ Creating statistics... </p>
                                        </div>
                                    """)

                stats = gr.Markdown()
                stat_adv_image =gr.Plot(type="matplotlib")
                gr.Markdown(DASHBOARD_EXPLANATION)
                test_results=gr.Plot(type="matplotlib")

            dashboard.select(get_statistics,inputs=[],outputs=[stat_adv_image,test_results,notification,stats])



    block.launch()  
        
     


if __name__ == "__main__":
    main()