import gradio as gr
import torch
from PIL import Image
from models.r2gen import R2GenModel
from modules.tokenizers import Tokenizer
import argparse

# Assuming you have a predefined configuration function for model args
def get_model_args():
    parser = argparse.ArgumentParser()

    # Model loader settings
    parser.add_argument('--load', type=str, default='ckpts/few-shot.pth', help='the path to the model weights.')
    parser.add_argument('--prompt', type=str, default='prompt/prompt.pth', help='the path to the prompt weights.')
    
    # Data input settings
    parser.add_argument('--image_path', type=str, default='example_figs/example_fig1.jpg', help='the path to the test image.')
    parser.add_argument('--image_dir', type=str, default='data/images/', help='the path to the directory containing the data.')
    parser.add_argument('--ann_path', type=str, default='data/annotation.json', help='the path to the directory containing the data.')

    # Data loader settings
    parser.add_argument('--dataset_name', type=str, default='mimic_cxr', help='the dataset to be used.')
    parser.add_argument('--max_seq_length', type=int, default=60, help='the maximum sequence length of the reports.')
    parser.add_argument('--threshold', type=int, default=3, help='the cut off frequency for the words.')
    parser.add_argument('--num_workers', type=int, default=2, help='the number of workers for dataloader.')
    parser.add_argument('--batch_size', type=int, default=16, help='the number of samples for a batch')

    # Model settings (for visual extractor)
    parser.add_argument('--visual_extractor', type=str, default='resnet101', help='the visual extractor to be used.')
    parser.add_argument('--visual_extractor_pretrained', type=bool, default=True, help='whether to load the pretrained visual extractor')

    # Model settings (for Transformer)
    parser.add_argument('--d_model', type=int, default=512, help='the dimension of Transformer.')
    parser.add_argument('--d_ff', type=int, default=512, help='the dimension of FFN.')
    parser.add_argument('--d_vf', type=int, default=2048, help='the dimension of the patch features.')
    parser.add_argument('--num_heads', type=int, default=8, help='the number of heads in Transformer.')
    parser.add_argument('--num_layers', type=int, default=3, help='the number of layers of Transformer.')
    parser.add_argument('--dropout', type=float, default=0.1, help='the dropout rate of Transformer.')
    parser.add_argument('--logit_layers', type=int, default=1, help='the number of the logit layer.')
    parser.add_argument('--bos_idx', type=int, default=0, help='the index of <bos>.')
    parser.add_argument('--eos_idx', type=int, default=0, help='the index of <eos>.')
    parser.add_argument('--pad_idx', type=int, default=0, help='the index of <pad>.')
    parser.add_argument('--use_bn', type=int, default=0, help='whether to use batch normalization.')
    parser.add_argument('--drop_prob_lm', type=float, default=0.5, help='the dropout rate of the output layer.')
    # for Relational Memory
    parser.add_argument('--rm_num_slots', type=int, default=3, help='the number of memory slots.')
    parser.add_argument('--rm_num_heads', type=int, default=8, help='the numebr of heads in rm.')
    parser.add_argument('--rm_d_model', type=int, default=512, help='the dimension of rm.')

    # Sample related
    parser.add_argument('--sample_method', type=str, default='beam_search', help='the sample methods to sample a report.')
    parser.add_argument('--beam_size', type=int, default=3, help='the beam size when beam searching.')
    parser.add_argument('--temperature', type=float, default=1.0, help='the temperature when sampling.')
    parser.add_argument('--sample_n', type=int, default=1, help='the sample number per image.')
    parser.add_argument('--group_size', type=int, default=1, help='the group size.')
    parser.add_argument('--output_logsoftmax', type=int, default=1, help='whether to output the probabilities.')
    parser.add_argument('--decoding_constraint', type=int, default=0, help='whether decoding constraint.')
    parser.add_argument('--block_trigrams', type=int, default=1, help='whether to use block trigrams.')

    # Trainer settings
    parser.add_argument('--n_gpu', type=int, default=1, help='the number of gpus to be used.')
    parser.add_argument('--epochs', type=int, default=100, help='the number of training epochs.')
    parser.add_argument('--save_dir', type=str, default='results/iu_xray', help='the patch to save the models.')
    parser.add_argument('--record_dir', type=str, default='records/', help='the patch to save the results of experiments')
    parser.add_argument('--save_period', type=int, default=1, help='the saving period.')
    parser.add_argument('--monitor_mode', type=str, default='max', choices=['min', 'max'], help='whether to max or min the metric.')
    parser.add_argument('--monitor_metric', type=str, default='BLEU_4', help='the metric to be monitored.')
    parser.add_argument('--early_stop', type=int, default=50, help='the patience of training.')

    # Optimization
    parser.add_argument('--optim', type=str, default='Adam', help='the type of the optimizer.')
    parser.add_argument('--lr_ve', type=float, default=5e-5, help='the learning rate for the visual extractor.')
    parser.add_argument('--lr_ed', type=float, default=1e-4, help='the learning rate for the remaining parameters.')
    parser.add_argument('--weight_decay', type=float, default=5e-5, help='the weight decay.')
    parser.add_argument('--amsgrad', type=bool, default=True, help='.')

    # Learning Rate Scheduler
    parser.add_argument('--lr_scheduler', type=str, default='StepLR', help='the type of the learning rate scheduler.')
    parser.add_argument('--step_size', type=int, default=50, help='the step size of the learning rate scheduler.')
    parser.add_argument('--gamma', type=float, default=0.1, help='the gamma of the learning rate scheduler.')

    # Others
    parser.add_argument('--seed', type=int, default=9233, help='.')
    parser.add_argument('--resume', type=str, help='whether to resume the training from existing checkpoints.')

    args = parser.parse_args()
    return args

def load_model():
    args = get_model_args()
    tokenizer = Tokenizer(args)
    device = 'cuda' if torch.cuda.is_available() else 'cpu'  # Determine the device dynamically
    model = R2GenModel(args, tokenizer).to(device)
    checkpoint_path = args.load
    # Ensure the state dict is loaded onto the same device as the model
    state_dict = torch.load(checkpoint_path, map_location=device)
    model_state_dict = state_dict['state_dict'] if 'state_dict' in state_dict else state_dict
    model.load_state_dict(model_state_dict)
    model.eval()
    return model, tokenizer

model, tokenizer = load_model()

def generate_report(image):
    image = Image.fromarray(image).convert('RGB')
    with torch.no_grad():
        output = model([image], mode='sample')
        reports = tokenizer.decode_batch(output.cpu().numpy())
        outputs = reports[0].split('.', 1)[-1].strip()
    return outputs

# Define Gradio interface
iface = gr.Interface(
    fn=generate_report,
    inputs=gr.Image(),  # Define input shape as needed
    outputs="text",
    title="PromptNet",
    description="Upload a medical image for thorax disease reporting.",
    examples=[["example_figs/0.png"], ["example_figs/1.png"], ["example_figs/2.png"]]
)

if __name__ == "__main__":
    iface.launch()