from dvc_eval import eval_dvc, eval_soda
import json
import argparse
import re
import difflib
import os
from torchvision.transforms import Compose, Resize, CenterCrop, Normalize
import torch

# Define image transforms
try:
    from torchvision.transforms import InterpolationMode
    BICUBIC = InterpolationMode.BICUBIC
except ImportError:
    BICUBIC = Image.BICUBIC
    from torchvision.transforms import Compose, Resize, CenterCrop, Normalize


transform = Compose([
    Resize(224, interpolation=BICUBIC),
    CenterCrop(224),
    Normalize((0.48145466, 0.4578275, 0.40821073), (0.26862954, 0.26130258, 0.27577711)),
])

# Check if model files exist
def check_model_files(config):
    """Check if required model files exist"""
    files_to_check = [
        config.clip_path,
        config.pretrain_mm_mlp_adapter,
        config.stage2,
        config.stage3,
        config.stage4,
        config.stage5,
        config.model_base
    ]
    
    missing_files = []
    for file_path in files_to_check:
        if not os.path.exists(file_path):
            missing_files.append(file_path)
    
    if missing_files:
        print("⚠ Missing model files:")
        for file_path in missing_files:
            print(f"  - {file_path}")
        print("\nPlease download the required model checkpoints.")
        return False
    else:
        print("✓ All model files found")
        return True

# CLIP Utility Functions


# Video Utility Functions
# Utility functions for video processing
def extract_video_features(video_path, clip_model, video_loader, transform):
    """Extract features from a video file"""
    try:
        # Extract frames from video
        _, images = video_loader.extract({'id': None, 'video': video_path})
        
        # Apply transforms
        images = transform(images / 255.0)
        images = images.to(torch.float16)
        
        # Encode with CLIP
        with torch.no_grad():
            features = clip_model.encode_image(images.to('cuda'))
        
        return features
    except Exception as e:
        print(f"Error processing video {video_path}: {e}")
        return None

def find_video_file(video_id, video_folder):
    """Find video file with various extensions"""
    for ext in ['mp4', 'mkv', 'webm', 'avi', 'mov']:
        video_path = os.path.join(video_folder, f"{video_id}.{ext}")
        if os.path.isfile(video_path):
            return video_path
    return None

def load_dataset(data_path):
    """Load dataset from JSON file"""
    try:
        with open(data_path, 'r') as f:
            data = json.load(f)
        return data
    except Exception as e:
        print(f"✗ Error loading dataset: {e}")
        return None


## EVALUTE FUNCTIONS
def merge_similar_sentences(data):
    if not data: return data
    merged_data = []
    current_sentence = data[0]["sentence"]
    current_timestamp = data[0]["timestamp"]
    for i in range(1, len(data)):
        next_sentence = data[i]["sentence"]
        next_timestamp = data[i]["timestamp"]
        if difflib.SequenceMatcher(None, current_sentence, next_sentence).ratio() > 0.98 and -1 <= next_timestamp[0] - current_timestamp[1] <= 1:
            current_timestamp = [current_timestamp[0], next_timestamp[1]]
        else:
            merged_data.append({"sentence": current_sentence, "timestamp": current_timestamp})
            current_sentence = next_sentence
            current_timestamp = next_timestamp
    merged_data.append({"sentence": current_sentence, "timestamp": current_timestamp})
    return merged_data

def evaluate(id, event, timestamps, answer, js):
    pred = {}
    pred[id] = []
    for num in range(len(event)):
        pred[id].append({
            'timestamp': timestamps[num],
            'sentence': event[num]
        })

    refined_pred = []
    for num_pred, curr_pred in enumerate(pred[id]):
        duplicate = False
        for curr_pred2 in pred[id][num_pred + 1:]:
        
            if curr_pred2 == curr_pred:
                num_duplicates+=1
                duplicate=True
            
        
        if not duplicate:
            refined_pred.append(curr_pred)

    pred[id] = refined_pred
    gt_js = {k: v for k, v in js.items() if k in pred.keys()}
    
    for id, items in list(pred.items()): 
        items = merge_similar_sentences(items)
        duration = gt_js[id]['duration']
        for item in items:
            item['timestamp'][0] = item['timestamp'][0] * duration / 100
            item['timestamp'][1] = (item['timestamp'][1] + 1) * duration / 100
        pred[id] = items
    
    pred_result = {'results': pred}
    metrics = eval_soda(pred_result, [gt_js], print_matrix=False)
    metrics.update(eval_dvc(pred_result, [gt_js], 
                tious=[0.3, 0.5, 0.7], 
                distances=[],
                max_proposals_per_video=1000, 
                verbose=False, 
                no_lang_eval=False))

    print(f"Found {len(pred)} logs")
    metrics = {k: v.item() * 100 for k, v in metrics.items() if k in ['soda_c', 'METEOR', 'CIDEr']}
    return metrics