"""
🎭 Advanced Face Swap Studio - HuggingFace Spaces Optimized
=========================================================

✅ FEATURES:
- Professional face swapping with GPU acceleration
- Batch processing for multiple videos
- Real-time processing monitor
- Lip sync integration (beta)
- Enhanced face detection and analysis

🚀 Optimized exclusively for HuggingFace Spaces environment
"""

import os
import sys
import tempfile
import time
import shutil
import subprocess as sp
import uuid
import zipfile
import gc
from pathlib import Path

# Set up environment for HuggingFace Spaces
os.environ["KMP_DUPLICATE_LIB_OK"] = "TRUE"
os.environ["TF_FORCE_GPU_ALLOW_GROWTH"] = "TRUE"
os.environ["PYTHONPATH"] = "."

# Core imports
import gradio as gr
import torch

# Optional imports with graceful degradation
try:
    import onnxruntime as ort
    print("✅ ONNX Runtime loaded successfully")
except ImportError as e:
    print(f"⚠️ ONNX Runtime not available: {e}")

try:
    from moviepy.editor import VideoFileClip
    MOVIEPY_AVAILABLE = True
    print("✅ MoviePy loaded successfully")
except ImportError as e:
    print(f"⚠️ MoviePy not available: {e}")
    MOVIEPY_AVAILABLE = False

# Try to import enhancement modules - make this more robust
ENHANCEMENT_AVAILABLE = False
try:
    import importlib.util
    
    # Check if the modules exist
    face_enhancer_path = Path("SwitcherAI/processors/frame/modules/face_enhancer.py")
    frame_enhancer_path = Path("SwitcherAI/processors/frame/modules/frame_enhancer.py")
    
    if face_enhancer_path.exists() and frame_enhancer_path.exists():
        sys.path.insert(0, str(Path("SwitcherAI/processors/frame/modules").resolve()))
        import face_enhancer
        import frame_enhancer
        ENHANCEMENT_AVAILABLE = True
        print("✅ Enhancement modules loaded successfully")
    else:
        print("⚠️ Enhancement module files not found")
        
except Exception as e:
    print(f"⚠️ Enhancement modules not available: {e}")

# Directory setup for HuggingFace Spaces
BASE_DIR = Path(__file__).parent.resolve()
TEMP_DIR = BASE_DIR / "temp_workspace"
OUTPUT_DIR = BASE_DIR / "outputs"
CONVERT_DIR = BASE_DIR / "Convert"
ASSETS_DIR = BASE_DIR / ".assets" / "models"

# Create directories with better error handling
for directory in [TEMP_DIR, OUTPUT_DIR, CONVERT_DIR, ASSETS_DIR]:
    try:
        directory.mkdir(parents=True, exist_ok=True)
        print(f"📁 Directory ready: {directory}")
    except Exception as e:
        print(f"⚠️ Failed to create directory {directory}: {e}")

print(f"📁 Base directory: {BASE_DIR}")
print(f"📂 Temp directory: {TEMP_DIR}")
print(f"📤 Output directory: {OUTPUT_DIR}")
print(f"🎯 Assets directory: {ASSETS_DIR}")
print(f"📁 Convert directory: {CONVERT_DIR}")

# Try to set up SwitcherAI temp directory
try:
    sys.path.insert(0, str(BASE_DIR))
    from SwitcherAI.utilities import conditional_download
    
    # Set up temp directory for SwitcherAI
    temp_switcher_dir = TEMP_DIR / "switcher_temp"
    temp_switcher_dir.mkdir(exist_ok=True)
    
    # Set environment variable for temp directory
    os.environ['SWITCHER_TEMP_DIR'] = str(temp_switcher_dir)
    
    print("🔧 SwitcherAI utilities loaded successfully")
    
except ImportError as e:
    print(f"⚠️ Could not import SwitcherAI utilities: {e}")
    print("🔄 Using default temp directory behavior")

# Download required model files with better error handling
def download_required_models():
    """Download required model files if not present"""
    import urllib.request
    import urllib.error
    
    models_to_download = [
        {
            'name': 'inswapper_128_fp16.onnx',
            'url': 'https://huggingface.co/ninjawick/webui-faceswap-unlocked/resolve/main/inswapper_128_fp16.onnx',
            'path': ASSETS_DIR / 'inswapper_128_fp16.onnx',
            'description': 'InSwapper FP16 face swap model'
        },
        {
            'name': 'inswapper_128.onnx',
            'url': 'https://huggingface.co/xingren23/comfyflow-models/resolve/main/insightface/inswapper_128.onnx',
            'path': ASSETS_DIR / 'inswapper_128.onnx',
            'description': 'InSwapper face swap model'
        },
        {
            'name': 'GFPGANv1.4.pth',
            'url': 'https://huggingface.co/gmk123/GFPGAN/resolve/main/GFPGANv1.4.pth',
            'path': ASSETS_DIR / 'GFPGANv1.4.pth',
            'description': 'GFPGAN face enhancement model'
        }
    ]
    
    for model in models_to_download:
        model_path = model['path']
        model_url = model['url']
        model_name = model['name']
        
        try:
            if model_path.exists() and model_path.stat().st_size > 1024:  # Check if file exists and is > 1KB
                file_size = model_path.stat().st_size / (1024 * 1024)  # MB
                print(f"✅ {model_name} already exists ({file_size:.1f}MB)")
                continue
        except Exception as e:
            print(f"⚠️ Error checking {model_name}: {e}")
        
        try:
            print(f"📥 Downloading {model_name}...")
            print(f"    Description: {model['description']}")
            print(f"    URL: {model_url}")
            print(f"    Path: {model_path}")
            
            # Ensure parent directory exists
            model_path.parent.mkdir(parents=True, exist_ok=True)
            
            # Create a progress callback
            def progress_callback(block_num, block_size, total_size):
                if total_size > 0:
                    percent = min(100, (block_num * block_size * 100) / total_size)
                    if block_num % 200 == 0:  # Update every 200 blocks to avoid spam
                        print(f"    Progress: {percent:.1f}%")
            
            # Download with progress and proper headers for HuggingFace
            req = urllib.request.Request(model_url)
            req.add_header('User-Agent', 'Mozilla/5.0 (compatible; FaceSwapStudio/1.0)')
            
            with urllib.request.urlopen(req) as response:
                total_size = int(response.headers.get('Content-Length', 0))
                downloaded = 0
                
                with open(model_path, 'wb') as f:
                    while True:
                        chunk = response.read(8192)
                        if not chunk:
                            break
                        f.write(chunk)
                        downloaded += len(chunk)
                        
                        if total_size > 0 and downloaded % (8192 * 100) == 0:  # Progress every ~800KB
                            percent = (downloaded * 100) / total_size
                            print(f"    Progress: {percent:.1f}%")
            
            # Verify download
            if model_path.exists() and model_path.stat().st_size > 1024:
                file_size = model_path.stat().st_size / (1024 * 1024)  # MB
                print(f"✅ {model_name} downloaded successfully ({file_size:.1f}MB)")
            else:
                print(f"❌ {model_name} download failed - file not created or too small")
                # Clean up failed download
                if model_path.exists():
                    model_path.unlink()
                    
        except urllib.error.URLError as e:
            print(f"❌ Network error downloading {model_name}: {e}")
        except Exception as e:
            print(f"❌ Error downloading {model_name}: {e}")

# Download models at startup - BEFORE web interface
print("\n🔄 Checking required model files...")
try:
    download_required_models()
    print("✅ Model check complete\n")
except Exception as e:
    print(f"⚠️ Model download failed: {e}\n")

# Global variables
current_process = None
last_output_path = None
last_batch_mode = False

def get_available_gpus():
    """Get list of available CUDA devices for HuggingFace Spaces"""
    print("🔍 Detecting GPU devices...")
    available_gpus = []
    
    if not torch.cuda.is_available():
        print("❌ CUDA not available")
        return ["CPU Only"]
    
    try:
        device_count = torch.cuda.device_count()
        print(f"🔢 CUDA devices detected: {device_count}")
        
        for i in range(device_count):
            try:
                props = torch.cuda.get_device_properties(i)
                gpu_name = props.name
                gpu_memory = props.total_memory / (1024**3)  # GB
                
                # Test device accessibility
                torch.cuda.set_device(i)
                test_tensor = torch.tensor([1.0], device=f'cuda:{i}')
                
                gpu_entry = f"GPU {i}: {gpu_name} ({gpu_memory:.1f}GB)"
                available_gpus.append(gpu_entry)
                print(f"✅ {gpu_entry}")
                
                del test_tensor
                torch.cuda.empty_cache()
                
            except Exception as e:
                print(f"❌ Error with GPU {i}: {e}")
                available_gpus.append(f"GPU {i}: Error")
    
    except Exception as e:
        print(f"❌ GPU detection failed: {e}")
    
    available_gpus.append("CPU Only")
    return available_gpus

def set_gpu_device(gpu_selection):
    """Set CUDA device based on selection"""
    try:
        if gpu_selection.startswith("GPU") and "Error" not in gpu_selection:
            gpu_id = gpu_selection.split(":")[0].split(" ")[1]
            os.environ["CUDA_VISIBLE_DEVICES"] = gpu_id
            print(f"🖥️ Using GPU {gpu_id}")
            return gpu_id
        else:
            os.environ["CUDA_VISIBLE_DEVICES"] = ""
            print("🖥️ Using CPU mode")
            return "cpu"
    except Exception as e:
        print(f"⚠️ Error setting GPU device: {e}")
        os.environ["CUDA_VISIBLE_DEVICES"] = ""
        return "cpu"

def safe_copy_file(source, destination):
    """Safely copy file with verification"""
    try:
        if isinstance(source, str):
            source = Path(source)
        if isinstance(destination, str):
            destination = Path(destination)
            
        destination.parent.mkdir(parents=True, exist_ok=True)
        
        # Check source file exists and is readable
        if not source.exists():
            print(f"❌ Source file does not exist: {source}")
            return False
            
        if source.stat().st_size == 0:
            print(f"❌ Source file is empty: {source}")
            return False
        
        shutil.copy2(source, destination)
        
        # Verify copy
        if destination.exists() and destination.stat().st_size > 0:
            print(f"✅ File copied: {destination.name}")
            return True
        else:
            print(f"❌ Copy verification failed: {destination.name}")
            return False
            
    except Exception as e:
        print(f"❌ Copy error: {e}")
        return False

def handle_batch_file_upload(files):
    """Handle multiple file uploads for batch mode"""
    if not files:
        return "📁 No files uploaded"
    
    # Clear existing files in convert directory
    try:
        for existing_file in CONVERT_DIR.glob("*"):
            if existing_file.is_file():
                existing_file.unlink()
    except Exception as e:
        print(f"⚠️ Error cleaning convert directory: {e}")
    
    uploaded_count = 0
    failed_count = 0
    
    for file in files:
        try:
            if file is None:
                continue
            
            # Get the original filename
            original_name = Path(file.name).name if hasattr(file, 'name') else f"video_{uploaded_count}.mp4"
            
            # Copy file to convert directory
            dest_path = CONVERT_DIR / original_name
            
            if safe_copy_file(file, dest_path):
                file_size = dest_path.stat().st_size / (1024 * 1024)  # MB
                print(f"✅ Uploaded: {original_name} ({file_size:.1f}MB)")
                uploaded_count += 1
            else:
                print(f"❌ Failed to upload: {original_name}")
                failed_count += 1
                
        except Exception as e:
            print(f"❌ Error uploading file: {e}")
            failed_count += 1
    
    status_msg = f"📦 Batch Upload Complete:\n✅ Uploaded: {uploaded_count} files\n"
    if failed_count > 0:
        status_msg += f"❌ Failed: {failed_count} files\n"
    
    # List uploaded files
    try:
        uploaded_files = [f.name for f in CONVERT_DIR.glob("*.mp4")] + [f.name for f in CONVERT_DIR.glob("*.avi")] + [f.name for f in CONVERT_DIR.glob("*.mov")]
        if uploaded_files:
            status_msg += f"📁 Files ready for processing:\n" + "\n".join([f"  • {f}" for f in uploaded_files[:10]])
            if len(uploaded_files) > 10:
                status_msg += f"\n  ... and {len(uploaded_files) - 10} more"
    except Exception as e:
        print(f"⚠️ Error listing files: {e}")
    
    return status_msg

def resize_video(input_path, output_path, fps=30):
    """Resize/process video with fallback"""
    try:
        if not MOVIEPY_AVAILABLE:
            print("⚠️ MoviePy not available - copying video directly")
            shutil.copy2(input_path, output_path)
            return True
        
        print(f"🎬 Processing video: {input_path.name}")
        clip = VideoFileClip(str(input_path))
        clip.write_videofile(str(output_path), fps=fps, audio_codec='aac', verbose=False, logger=None)
        clip.close()
        print("✅ Video processed successfully")
        return True
        
    except Exception as e:
        print(f"❌ Video processing failed: {e}")
        try:
            shutil.copy2(input_path, output_path)
            return True
        except Exception as e2:
            print(f"❌ Fallback copy failed: {e2}")
            return False

def extract_audio(video_path, audio_path):
    """Extract audio from video"""
    try:
        if not MOVIEPY_AVAILABLE:
            print("⚠️ MoviePy not available - cannot extract audio")
            return False
        
        clip = VideoFileClip(str(video_path))
        if clip.audio is not None:
            clip.audio.write_audiofile(str(audio_path), logger=None, verbose=False)
            clip.close()
            return True
        else:
            clip.close()
            return False
            
    except Exception as e:
        print(f"❌ Audio extraction failed: {e}")
        return False

def cleanup_temp_files():
    """Clean up temporary files"""
    try:
        for file in TEMP_DIR.glob("*"):
            if file.is_file():
                file.unlink()
        print("🧹 Temp files cleaned")
    except Exception as e:
        print(f"⚠️ Cleanup error: {e}")

def cleanup_convert_files():
    """Clean up convert directory files"""
    try:
        for file in CONVERT_DIR.glob("*"):
            if file.is_file():
                file.unlink()
        print("🧹 Convert directory cleaned")
    except Exception as e:
        print(f"⚠️ Convert cleanup error: {e}")

def create_batch_zip():
    """Create zip file of all output files"""
    try:
        output_files = list(OUTPUT_DIR.glob("*.mp4")) + list(OUTPUT_DIR.glob("*.avi"))
        if not output_files:
            return None
        
        zip_path = OUTPUT_DIR / f"batch_results_{int(time.time())}.zip"
        
        with zipfile.ZipFile(zip_path, 'w', zipfile.ZIP_DEFLATED) as zipf:
            for file in output_files:
                zipf.write(file, file.name)
                print(f"📦 Added to zip: {file.name}")
        
        print(f"✅ Batch zip created: {zip_path.name}")
        return zip_path
        
    except Exception as e:
        print(f"❌ Zip creation failed: {e}")
        return None

def get_download_file():
    """Get the latest output file for download"""
    try:
        output_files = list(OUTPUT_DIR.glob("*.mp4")) + list(OUTPUT_DIR.glob("*.avi")) + list(OUTPUT_DIR.glob("*.zip"))
        if not output_files:
            return None, "📁 No output files found"
        
        latest_file = max(output_files, key=lambda f: f.stat().st_ctime)
        file_size = latest_file.stat().st_size / (1024 * 1024)  # MB
        
        return str(latest_file), f"📥 Ready: {latest_file.name} ({file_size:.1f}MB)"
        
    except Exception as e:
        return None, f"❌ Error: {e}"

def run_single_video(source_image, target_video, frame_processor, face_analyser_direction,
                    face_recognition, face_analyser_gender, face_analyser_age, skip_audio,
                    keep_fps, lip_syncer_model, enable_lip_sync, gpu_selection):
    """Process single video"""
    global last_output_path, last_batch_mode, current_process
    last_batch_mode = False
    
    try:
        set_gpu_device(gpu_selection)
        
        # Setup temp files
        temp_source = TEMP_DIR / 'source-image.jpg'
        temp_target = TEMP_DIR / 'resize-vid.mp4'
        
        # Copy and process files
        if not safe_copy_file(Path(source_image), temp_source):
            return "❌ Failed to copy source image", ""
        
        if not resize_video(Path(target_video), temp_target):
            return "❌ Video processing failed", ""
        
        # Generate output filename
        source_name = Path(source_image).stem
        target_name = Path(target_video).stem
        suffix = "_lipsynced" if enable_lip_sync else ""
        output_filename = f"{source_name}_{target_name}{suffix}.mp4"
        output_path = OUTPUT_DIR / output_filename
        
        # Handle lip sync
        audio_path = None
        if enable_lip_sync:
            audio_path = TEMP_DIR / 'target-audio.wav'
            if not extract_audio(temp_target, audio_path):
                print("⚠️ Lip sync disabled - audio extraction failed")
                enable_lip_sync = False
        
        # Build command
        execution_provider = "cuda" if gpu_selection.startswith("GPU") and "Error" not in gpu_selection else "cpu"
        
        cmd = [
            sys.executable, "run.py",
            "--execution-providers", execution_provider,
            "--execution-thread-count", "8",
            "--reference-face-distance", "1.5",
            "-s", str(temp_source),
            "-t", str(temp_target),
            "-o", str(output_path),
            "--frame-processors"] + frame_processor + [
            "--face-analyser-direction", face_analyser_direction,
            "--face-analyser-age", face_analyser_age
        ]
        
        if enable_lip_sync and audio_path:
            cmd.extend(["--source-paths", str(audio_path)])
            cmd.extend(["--lip-syncer-model", lip_syncer_model])
            if 'lip_syncer' not in frame_processor:
                idx = cmd.index("--frame-processors") + 1
                cmd[idx:idx] = ['lip_syncer']
        
        if face_recognition != 'none':
            cmd.extend(["--face-recognition", face_recognition])
        if face_analyser_gender != 'none':
            cmd.extend(["--face-analyser-gender", face_analyser_gender])
        if skip_audio and not enable_lip_sync:
            cmd.append("--skip-audio")
        if keep_fps:
            cmd.append("--keep-fps")
        
        print("🚀 Starting face swap processing...")
        print(f"📋 Command: {' '.join(cmd)}")
        start_time = time.time()
        
        current_process = sp.Popen(
            cmd, 
            stdout=sp.PIPE, 
            stderr=sp.STDOUT, 
            text=True, 
            bufsize=1,
            cwd=str(BASE_DIR)
        )
        
        cli_output = ""
        while True:
            output = current_process.stdout.readline()
            if output == '' and current_process.poll() is not None:
                break
            if output:
                line = output.strip()
                print(line)
                cli_output += line + "\n"
                
                # Keep output manageable
                lines = cli_output.split('\n')
                if len(lines) > 50:
                    cli_output = '\n'.join(lines[-50:])
                
                yield None, cli_output
        
        rc = current_process.poll()
        execution_time = time.time() - start_time
        
        if rc != 0:
            return "❌ Processing failed", cli_output + f"\n\n⏱️ Time: {execution_time:.2f}s"
        
        # Cleanup
        try:
            if torch.cuda.is_available():
                torch.cuda.empty_cache()
            gc.collect()
            
            if audio_path and audio_path.exists():
                audio_path.unlink()
        except Exception as e:
            print(f"⚠️ Cleanup error: {e}")
        
        last_output_path = str(output_path)
        
        return str(output_path), cli_output + f"\n\n✅ Completed in {execution_time:.2f}s"
        
    except Exception as e:
        return f"❌ Error: {e}", ""

def run_batch_processing(source_image, frame_processor, face_analyser_direction, face_recognition,
                        face_analyser_gender, skip_audio, keep_fps, lip_syncer_model, enable_lip_sync, gpu_selection):
    """Process all videos in Convert folder"""
    global last_output_path, last_batch_mode, current_process
    last_batch_mode = True
    
    try:
        set_gpu_device(gpu_selection)
        
        video_extensions = ['*.mp4', '*.avi', '*.mov', '*.mkv']
        video_files = []
        for ext in video_extensions:
            video_files.extend(CONVERT_DIR.glob(ext))
        
        if not video_files:
            yield None, f"📁 No video files found in Convert folder.\nPlease upload videos using the file input above."
            return
        
        temp_source = TEMP_DIR / 'source-image.jpg'
        if not safe_copy_file(Path(source_image), temp_source):
            yield None, "❌ Failed to copy source image"
            return
        
        source_name = Path(source_image).stem
        cli_output = f"📊 Processing {len(video_files)} videos in batch mode\n🎯 Source: {source_name}\n\n"
        yield None, cli_output
        
        successful = 0
        failed = 0
        
        for i, video_file in enumerate(video_files, 1):
            current_output = f"[{i}/{len(video_files)}] 🎬 {video_file.name}\n"
            cli_output += current_output
            yield None, cli_output
            
            temp_target = TEMP_DIR / 'resize-vid.mp4'
            
            if not resize_video(video_file, temp_target):
                error_msg = f"❌ Video resize failed\n"
                cli_output += error_msg
                failed += 1
                yield None, cli_output
                continue
            
            suffix = "_lipsynced" if enable_lip_sync else ""
            output_filename = f"{source_name}_{video_file.stem}{suffix}.mp4"
            output_path = OUTPUT_DIR / output_filename
            
            # Handle lip sync
            audio_path = None
            if enable_lip_sync:
                audio_path = TEMP_DIR / 'target-audio.wav'
                if not extract_audio(temp_target, audio_path):
                    enable_lip_sync = False
            
            # Build command
            execution_provider = "cuda" if gpu_selection.startswith("GPU") and "Error" not in gpu_selection else "cpu"
            
            cmd = [
                sys.executable, "run.py",
                "--execution-providers", execution_provider,
                "--execution-thread-count", "8",
                "--reference-face-distance", "1.5",
                "-s", str(temp_source),
                "-t", str(temp_target),
                "-o", str(output_path),
                "--frame-processors"] + frame_processor + [
                "--face-analyser-direction", face_analyser_direction
            ]
            
            if enable_lip_sync and audio_path:
                cmd.extend(["--source-paths", str(audio_path)])
                cmd.extend(["--lip-syncer-model", lip_syncer_model])
                if 'lip_syncer' not in frame_processor:
                    idx = cmd.index("--frame-processors") + 1
                    cmd[idx:idx] = ['lip_syncer']
            
            if face_recognition != 'none':
                cmd.extend(["--face-recognition", face_recognition])
            if face_analyser_gender != 'none':
                cmd.extend(["--face-analyser-gender", face_analyser_gender])
            if skip_audio and not enable_lip_sync:
                cmd.append("--skip-audio")
            if keep_fps:
                cmd.append("--keep-fps")
            
            try:
                start_time = time.time()
                current_process = sp.Popen(
                    cmd, 
                    stdout=sp.PIPE, 
                    stderr=sp.STDOUT, 
                    text=True, 
                    bufsize=1,
                    cwd=str(BASE_DIR)
                )
                
                while True:
                    output = current_process.stdout.readline()
                    if output == '' and current_process.poll() is not None:
                        break
                    if output:
                        line = output.strip()
                        print(line)
                
                rc = current_process.poll()
                execution_time = time.time() - start_time
                
                if rc == 0:
                    success_msg = f"✅ Completed in {execution_time:.2f}s\n\n"
                    cli_output += success_msg
                    successful += 1
                else:
                    error_msg = f"❌ Processing failed\n\n"
                    cli_output += error_msg
                    failed += 1
                
                yield None, cli_output
                
                # Cleanup
                try:
                    if torch.cuda.is_available():
                        torch.cuda.empty_cache()
                    gc.collect()
                    
                    if audio_path and audio_path.exists():
                        audio_path.unlink()
                except Exception as e:
                    print(f"⚠️ Cleanup error: {e}")
                    
            except Exception as e:
                error_msg = f"❌ Error: {e}\n\n"
                cli_output += error_msg
                failed += 1
                yield None, cli_output
        
        # Final summary
        final_msg = f"\n=== BATCH COMPLETE ===\n✅ Successful: {successful}\n❌ Failed: {failed}\n"
        cli_output += final_msg
        
        if successful > 0:
            last_output_path = str(create_batch_zip())
        
        yield None, cli_output
        
    except Exception as e:
        yield None, f"❌ Batch processing error: {e}"

def handle_processing(source_image, target_video, frame_processor, face_analyser_direction, face_recognition,
                     face_analyser_gender, face_analyser_age, skip_audio, keep_fps,
                     lip_syncer_model, enable_lip_sync, use_folder_mode, gpu_selection):
    """Main processing handler"""
    
    try:
        if use_folder_mode:
            for _, cli_output in run_batch_processing(
                source_image, frame_processor, face_analyser_direction, face_recognition,
                face_analyser_gender, skip_audio, keep_fps, lip_syncer_model, enable_lip_sync, gpu_selection
            ):
                yield cli_output, "⏹️ CANCEL"
            yield cli_output + "\n🎉 Batch processing complete!", "📥 DOWNLOAD"
        else:
            for video_result, cli_output in run_single_video(
                source_image, target_video, frame_processor, face_analyser_direction, face_recognition,
                face_analyser_gender, face_analyser_age, skip_audio, keep_fps,
                lip_syncer_model, enable_lip_sync, gpu_selection
            ):
                yield cli_output, "⏹️ CANCEL"
            
            if video_result and not video_result.startswith("❌"):
                yield cli_output + "\n🎉 Processing complete!", "📥 DOWNLOAD"
            else:
                yield cli_output, "🔄 RESET"
                
    except Exception as e:
        yield f"❌ Processing error: {e}", "🔄 RESET"

def cancel_processing():
    """Cancel current processing"""
    global current_process
    try:
        if current_process and current_process.poll() is None:
            current_process.terminate()
            current_process.wait(timeout=10)
            return "⏹️ Processing cancelled"
        else:
            return "⚠️ No active processing"
    except Exception as e:
        try:
            if current_process:
                current_process.kill()
                current_process.wait()
            return f"⏹️ Processing force-cancelled: {e}"
        except:
            return f"❌ Cancel failed: {e}"

def reset_interface():
    """Reset interface to defaults"""
    try:
        cleanup_temp_files()
        cleanup_convert_files()
        
        return (
            None,  # source_image
            None,  # target_video
            ['face_swapper'] + (['face_enhancer'] if ENHANCEMENT_AVAILABLE else []),  # frame_processor
            'top-bottom',  # face_analyser_direction
            'reference',  # face_recognition
            'female',  # face_analyser_gender
            'adult',  # face_analyser_age
            False,  # skip_audio
            True,  # keep_fps
            'wav2lip_gan_96',  # lip_syncer_model
            False,  # enable_lip_sync
            False,  # use_folder_mode
            AVAILABLE_GPUS[0] if AVAILABLE_GPUS else "CPU Only",  # gpu_selection
            "🔧 Interface reset. Ready for new session!",  # cli_output
            "🚀 START PROCESSING"  # button text
        )
    except Exception as e:
        return (None, None, ['face_swapper'], 'top-bottom', 'reference', 'female', 'adult', 
                False, True, 'wav2lip_gan_96', False, False, "CPU Only", 
                f"⚠️ Reset error: {e}", "🚀 START PROCESSING")

def handle_download():
    """Handle download button click"""
    try:
        download_path, status = get_download_file()
        if download_path:
            return download_path, status, gr.update(visible=True), gr.update(visible=False)
        else:
            return None, status, gr.update(visible=False), gr.update(visible=True)
    except Exception as e:
        return None, f"❌ Download error: {e}", gr.update(visible=False), gr.update(visible=True)

def handle_action_button(button_text, *inputs):
    """Handle multi-purpose action button"""
    try:
        if "RESET" in button_text:
            return reset_interface()
        elif "CANCEL" in button_text:
            cancel_msg = cancel_processing()
            return inputs + (cancel_msg, "🔄 RESET")
        else:
            return inputs + ("", button_text)
    except Exception as e:
        return inputs + (f"❌ Action error: {e}", "🔄 RESET")

def toggle_batch_mode(use_folder_mode):
    """Handle batch mode toggle"""
    try:
        if use_folder_mode:
            return gr.update(
                label="📁 Target Videos (Drag multiple files here)",
                file_count="multiple",
                file_types=["video"]
            )
        else:
            return gr.update(
                label="Target Video (Video to modify)", 
                file_count="single",
                file_types=["video"]
            )
    except Exception as e:
        print(f"⚠️ Toggle batch mode error: {e}")
        return gr.update(label="Target Video")

def handle_file_upload(files, use_folder_mode):
    """Handle file uploads - single or multiple"""
    try:
        if use_folder_mode and files:
            # Handle batch upload
            return handle_batch_file_upload(files)
        elif not use_folder_mode and files:
            # Single file mode - just return status
            return f"✅ Single video uploaded: {Path(files.name).name if hasattr(files, 'name') else 'video file'}"
        else:
            return "📁 No files uploaded"
    except Exception as e:
        return f"❌ Upload error: {e}"

# Initialize GPU detection
try:
    AVAILABLE_GPUS = get_available_gpus()
    print(f"🖥️ Available GPUs: {AVAILABLE_GPUS}")
except Exception as e:
    print(f"⚠️ GPU detection failed: {e}")
    AVAILABLE_GPUS = ["CPU Only"]

# Gradio Interface
def create_interface():
    with gr.Blocks(
        theme=gr.themes.Monochrome(
            primary_hue=gr.themes.colors.teal,
            secondary_hue=gr.themes.colors.gray,
            font=gr.themes.GoogleFont('Inter')
        ).set(
            background_fill_primary="#1f1f1f",
            background_fill_secondary="#2d2d2d"
        ),
        css="""
        .gradio-container { max-width: 1400px !important; margin: 0 auto !important; }
        .main-header { text-align: center; padding: 1rem; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); border-radius: 12px; color: white; margin-bottom: 1rem; }
        .control-panel { background: rgba(102, 126, 234, 0.1); border-radius: 12px; padding: 1rem; margin-bottom: 1rem; border: 2px solid rgba(102, 126, 234, 0.2); }
        .section-header { font-weight: 600; color: #667eea; margin-bottom: 1rem; border-bottom: 2px solid #667eea; padding-bottom: 0.5rem; }
        """
    ) as interface:
        
        # Header
        with gr.Column(elem_classes="main-header"):
            gr.Markdown("# 🎭 Advanced Face Swap Studio\n**HuggingFace Spaces Optimized**")
        
        with gr.Row():
            # Left Column - Input & Controls
            with gr.Column(scale=2):
                with gr.Group(elem_classes="control-panel"):
                    gr.HTML('<div class="section-header">📸 Input Files</div>')
                    
                    source_image = gr.File(
                        label="Source Image (Face to use)",
                        file_types=["image"],
                        file_count="single"
                    )
                    
                    # Batch mode toggle
                    use_folder_mode = gr.Checkbox(
                        label="📁 Batch Mode (Process multiple videos)",
                        value=False
                    )
                    
                    target_video = gr.File(
                        label="Target Video (Video to modify)",
                        file_types=["video"],
                        file_count="single"
                    )
                    
                    # Upload status display
                    upload_status = gr.Textbox(
                        label="Upload Status",
                        value="Ready to upload files...",
                        interactive=False,
                        lines=3
                    )
                
                with gr.Group(elem_classes="control-panel"):
                    gr.HTML('<div class="section-header">🎮 Controls</div>')
                    
                    start_button = gr.Button("🚀 START PROCESSING", variant="primary", size="lg")
                    action_button = gr.Button("🔄 RESET", variant="secondary", size="lg")
                    download_button = gr.Button("📥 DOWNLOAD", variant="secondary", size="lg")
                    
                    download_status = gr.Textbox(
                        label="Download Status",
                        value="Ready for processing...",
                        interactive=False,
                        lines=2
                    )
                    
                    download_file = gr.File(
                        label="Download File",
                        visible=False,
                        interactive=False
                    )
            
            # Middle Column - Configuration
            with gr.Column(scale=3):
                with gr.Group(elem_classes="control-panel"):
                    gr.HTML('<div class="section-header">⚙️ Processing Configuration</div>')
                    
                    with gr.Row():
                        with gr.Column():
                            # Frame processing
                            available_processors = ['face_swapper']
                            if ENHANCEMENT_AVAILABLE:
                                available_processors.extend(['face_enhancer', 'frame_enhancer'])
                            
                            frame_processor = gr.CheckboxGroup(
                                choices=available_processors,
                                label='Frame Processors',
                                value=['face_swapper'] + (['face_enhancer'] if ENHANCEMENT_AVAILABLE else [])
                            )
                            
                            enable_lip_sync = gr.Checkbox(label="🎵 Enable Lip Sync (Beta)", value=False)
                            lip_syncer_model = gr.Dropdown(
                                label='Lip Sync Model',
                                choices=['wav2lip_96', 'wav2lip_gan_96'],
                                value='wav2lip_gan_96',
                                visible=False
                            )
                        
                        with gr.Column():
                            # Face analysis
                            face_recognition = gr.Dropdown(
                                label='Recognition Mode',
                                choices=['none', 'reference', 'many'],
                                value='reference'
                            )
                            
                            face_analyser_direction = gr.Dropdown(
                                label='Analysis Direction',
                                choices=['left-right', 'right-left', 'top-bottom', 'bottom-top', 'small-large', 'large-small'],
                                value='top-bottom'
                            )
                            
                            face_analyser_gender = gr.Dropdown(
                                label='Target Gender',
                                choices=['none', 'male', 'female'],
                                value='female'
                            )
                            
                            face_analyser_age = gr.Dropdown(
                                label='Target Age Group',
                                choices=['child', 'teen', 'adult', 'senior'],
                                value='adult'
                            )
            
            # Right Column - Monitor & Options
            with gr.Column(scale=3):
                with gr.Group(elem_classes="control-panel"):
                    gr.HTML('<div class="section-header">🖥️ Processing Monitor</div>')
                    
                    cli_output = gr.Textbox(
                        label="Live Processing Output",
                        lines=15,
                        interactive=False,
                        show_copy_button=True,
                        placeholder="🔧 System ready. Configure settings and start processing..."
                    )
                
                with gr.Group(elem_classes="control-panel"):
                    gr.HTML('<div class="section-header">🛠️ Processing Options</div>')
                    
                    with gr.Row():
                        with gr.Column():
                            gpu_selection = gr.Dropdown(
                                label="🖥️ Compute Device",
                                choices=AVAILABLE_GPUS,
                                value=AVAILABLE_GPUS[0] if AVAILABLE_GPUS else "CPU Only"
                            )
                            
                            skip_audio = gr.Checkbox(label="🔇 Skip Audio", value=False)
                        
                        with gr.Column():
                            keep_fps = gr.Checkbox(label="🎬 Keep Original FPS", value=True)
        
        # Event handlers with error handling
        try:
            enable_lip_sync.change(
                lambda x: gr.update(visible=x),
                inputs=[enable_lip_sync],
                outputs=[lip_syncer_model]
            )
            
            use_folder_mode.change(
                toggle_batch_mode,
                inputs=[use_folder_mode],
                outputs=[target_video]
            )
            
            target_video.upload(
                handle_file_upload,
                inputs=[target_video, use_folder_mode],
                outputs=[upload_status]
            )
            
            start_button.click(
                handle_processing,
                inputs=[
                    source_image, target_video, frame_processor, face_analyser_direction,
                    face_recognition, face_analyser_gender, face_analyser_age,
                    skip_audio, keep_fps, lip_syncer_model, enable_lip_sync,
                    use_folder_mode, gpu_selection
                ],
                outputs=[cli_output, action_button]
            )
            
            action_button.click(
                handle_action_button,
                inputs=[
                    action_button, source_image, target_video, frame_processor,
                    face_analyser_direction, face_recognition, face_analyser_gender,
                    face_analyser_age, skip_audio, keep_fps, lip_syncer_model,
                    enable_lip_sync, use_folder_mode, gpu_selection
                ],
                outputs=[
                    source_image, target_video, frame_processor, face_analyser_direction,
                    face_recognition, face_analyser_gender, face_analyser_age,
                    skip_audio, keep_fps, lip_syncer_model, enable_lip_sync,
                    use_folder_mode, gpu_selection, cli_output, action_button
                ]
            )
            
            download_button.click(
                handle_download,
                outputs=[download_file, download_status, download_file, download_button]
            )
            
            download_file.change(
                lambda: (gr.update(visible=False), gr.update(visible=True), "Ready for next download"),
                outputs=[download_file, download_button, download_status]
            )
            
        except Exception as e:
            print(f"⚠️ Error setting up event handlers: {e}")
    
    return interface

# Launch application
if __name__ == "__main__":
    print("\n" + "="*60)
    print("🎭 Advanced Face Swap Studio - HuggingFace Spaces")
    print("="*60)
    print(f"📁 Directories configured:")
    print(f"  - Base: {BASE_DIR}")
    print(f"  - Temp: {TEMP_DIR}")
    print(f"  - Output: {OUTPUT_DIR}")
    print(f"  - Convert: {CONVERT_DIR}")
    print(f"🖥️ GPU Support: {torch.cuda.is_available()}")
    print(f"🎬 MoviePy: {'✅' if MOVIEPY_AVAILABLE else '❌'}")
    print(f"✨ Enhancement: {'✅' if ENHANCEMENT_AVAILABLE else '❌'}")
    print("="*60)
    
    # Clean startup
    cleanup_temp_files()
    
    # Create and launch interface
    try:
        app = create_interface()
        app.launch(
            server_name="0.0.0.0",
            server_port=7860,
            share=False,
            debug=False,
            show_error=True,
            max_file_size="1500mb"
        )
    except Exception as e:
        print(f"❌ Failed to launch application: {e}")
        print("🔄 Please check your dependencies and try again")