import os
import tempfile
import shutil
from pathlib import Path
from typing import List, Optional, Tuple, Dict
import requests
import time
from src.backblaze_storage import BB_uploadfile

try:
    import replicate
    REPLICATE_AVAILABLE = True
except ImportError:
    REPLICATE_AVAILABLE = False

class ReplicatePortraitAPI:
    def __init__(self, api_token: Optional[str] = None):
        """Initialize Replicate API client"""
        if not REPLICATE_AVAILABLE:
            raise ImportError("Replicate package not installed. Run: pip install replicate")
        
        self.api_token = api_token or os.getenv('REPLICATE_API_TOKEN')
        if not self.api_token:
            raise ValueError("REPLICATE_API_TOKEN environment variable or api_token parameter is required")
        
        # Set the API token for the replicate client
        os.environ['REPLICATE_API_TOKEN'] = self.api_token
        self.portrait_model = "flux-kontext-apps/portrait-series"
        self.trainer_model = "replicate/fast-flux-trainer:8b10794665aed907bb98a1a5324cd1d3a8bea0e9b31e65210967fb9c9e2e08ed"
        
        # Initialize client
        self.client = replicate.Client(api_token=self.api_token)
    
    def upload_file_to_replicate(self, file_path: str) -> str:
        """Upload file to Replicate and get URL"""
        try:
            with open(file_path, 'rb') as file:
                uploaded_file = self.client.files.create(file)
                return uploaded_file.urls['get']
        except Exception as e:
            # Fallback: convert to data URL for images only
            if file_path.lower().endswith(('.jpg', '.jpeg', '.png', '.webp', '.gif')):
                import base64
                with open(file_path, 'rb') as img_file:
                    img_data = img_file.read()
                    img_b64 = base64.b64encode(img_data).decode()
                    
                    # Determine MIME type
                    ext = Path(file_path).suffix.lower()
                    mime_types = {
                        '.jpg': 'image/jpeg',
                        '.jpeg': 'image/jpeg', 
                        '.png': 'image/png',
                        '.webp': 'image/webp',
                        '.gif': 'image/gif'
                    }
                    mime_type = mime_types.get(ext, 'image/jpeg')
                    
                    return f"data:{mime_type};base64,{img_b64}"
            else:
                raise Exception(f"Failed to upload file: {str(e)}")
    
    def download_images(self, image_urls: List[str], download_dir: str) -> List[str]:
        """Download images from URLs to local directory"""
        downloaded_paths = []
        
        for i, url in enumerate(image_urls):
            try:
                response = requests.get(url, stream=True)
                response.raise_for_status()
                
                # Generate filename
                filename = f"portrait_{i+1:02d}.png"
                filepath = os.path.join(download_dir, filename)
                
                # Download image
                with open(filepath, 'wb') as f:
                    for chunk in response.iter_content(chunk_size=8192):
                        f.write(chunk)
                
                downloaded_paths.append(filepath)
                
            except Exception as e:
                print(f"Error downloading image {i+1}: {e}")
                continue
        
        return downloaded_paths
    
    def generate_portrait_series(self, 
                                input_image_path: str,
                                num_images: int = 4,
                                background: str = "black", 
                                randomize_images: bool = True,
                                output_format: str = "png",
                                safety_tolerance: int = 1,
                                download_dir: Optional[str] = None) -> Tuple[List[str], dict]:
        """
        Generate portrait series using Replicate API
        
        Returns:
            Tuple of (downloaded_image_paths, api_response)
        """
        
        # Create download directory if not provided
        if download_dir is None:
            download_dir = tempfile.mkdtemp(prefix="portrait_series_")
        else:
            os.makedirs(download_dir, exist_ok=True)
        
        try:
            # Upload input image
            image_url = self.upload_file_to_replicate(input_image_path)
            
            # Prepare input data
            input_data = {
                "input_image": image_url,
                "num_images": num_images,
                "background": background,
                "randomize_images": randomize_images,
                "output_format": output_format,
                "safety_tolerance": safety_tolerance
            }
            
            # Run the model - this handles everything automatically!
            print(f"🔄 Running {self.portrait_model} with {num_images} images...")
            output = replicate.run(
                self.portrait_model,
                input=input_data
            )
            
            # The output is a list of image URLs
            if not output:
                raise Exception("No output images generated")
            
            print(f"✅ Generated {len(output)} images, downloading...")
            
            # Download images
            downloaded_paths = self.download_images(output, download_dir)
            
            # Create response dict for compatibility
            response = {
                "output": output,
                "input": input_data,
                "status": "succeeded",
                "model": self.portrait_model
            }
            
            return downloaded_paths, response
            
        except Exception as e:
            raise Exception(f"Error in portrait generation: {str(e)}")

    def start_flux_training(self,
                        input_images_zip: str,
                        destination: str,
                        trigger_word: str,
                        lora_type: str = "subject") -> Dict:
        """
        Start training a Fast Flux LoRA model
        
        Args:
            input_images_zip: Path to zip file containing training images OR URL to uploaded zip
            destination: Replicate model destination (username/model-name)
            trigger_word: Unique trigger word for the model
            lora_type: Type of training - "subject" or "style"
            
        Returns:
            Dict containing training information
        """
        try:
            # Upload zip file if it's a local path
            print(f"📤 Uploading training data: {input_images_zip}")
            zip_url = BB_uploadfile(input_images_zip, os.path.basename(input_images_zip))

            # Prepare training input
            training_input = {
                "input_images": zip_url,
                "trigger_word": trigger_word.lower(),
                "lora_type": lora_type.lower()
            }
            
            print(f"🚀 Starting Fast Flux training...")
            print(f"   Destination: {destination}")
            print(f"   Trigger word: {trigger_word}")
            print(f"   LoRA type: {lora_type}")
            
            # Create model if it doesn't exist
            try:
                owner, name = destination.split("/")
                
                model = self.client.models.create(
                    owner=owner.lower(),
                    name=name.lower(),
                    visibility="public",
                    hardware="gpu-a100-large"
                )
                print(f"✅ Model created! ID: {model.id}")
            except Exception as e:
                error_message = f"Error creating model: {str(e)}"
                print(error_message)
                # Continue anyway in case model already exists
            
            # Create training
            model_name, version = self.trainer_model.split(":")
            
            # Fixed the main issue: use 'destination' parameter instead of 'self.destination'
            # Also fixed the typo: 'tranining' -> 'training'
            training = self.client.trainings.create(
                model=model_name.lower(),
                version=version.lower(),
                input=training_input,
                destination=destination  # This was the main bug - was self.destination before
            )
            
            training_info = {
                "id": training.id,
                "status": training.status,
                "destination": destination,
                "trigger_word": trigger_word,
                "lora_type": lora_type,
                "created_at": getattr(training, 'created_at', None),
                "urls": getattr(training, 'urls', {}),
                "input": training_input
            }
            
            print(f"✅ Training started! ID: {training.id}")
            
            return training_info
            
        except Exception as e:
            raise Exception(f"Error starting training: {str(e)}")
    
    def get_training_status(self, training_id: str) -> Dict:
        """Get the status of a training"""
        try:
            training = self.client.trainings.get(training_id)
            
            return {
                "id": training.id,
                "status": training.status,
                "created_at": getattr(training, 'created_at', None),
                "completed_at": getattr(training, 'completed_at', None),
                "error": getattr(training, 'error', None),
                "logs": getattr(training, 'logs', None),
                "urls": getattr(training, 'urls', {}),
                "output": getattr(training, 'output', None)
            }
            
        except Exception as e:
            raise Exception(f"Error getting training status: {str(e)}")
    
    def wait_for_training_completion(self, training_id: str, max_wait_time: int = 3600, callback=None) -> Dict:
        """
        Wait for training to complete
        
        Args:
            training_id: Training ID to monitor
            max_wait_time: Maximum time to wait in seconds (default 1 hour)
            callback: Optional callback function to call with status updates
            
        Returns:
            Final training status dict
        """
        start_time = time.time()
        last_status = None
        
        while time.time() - start_time < max_wait_time:
            try:
                status = self.get_training_status(training_id)
                current_status = status.get('status', 'unknown')
                
                # Call callback if status changed
                if callback and current_status != last_status:
                    callback(status)
                    last_status = current_status
                
                if current_status == 'succeeded':
                    print(f"✅ Training completed successfully!")
                    return status
                elif current_status == 'failed':
                    error_msg = status.get('error', 'Unknown error occurred')
                    raise Exception(f"Training failed: {error_msg}")
                elif current_status in ['canceled', 'cancelled']:
                    raise Exception("Training was canceled")
                
                # Still processing, wait a bit
                time.sleep(30)  # Check every 30 seconds for training
                
            except Exception as e:
                if "Training failed" in str(e) or "canceled" in str(e):
                    raise
                # For other errors, continue waiting
                time.sleep(30)
        
        raise Exception(f"Training timed out after {max_wait_time} seconds")
    
    def list_user_models(self, username: str) -> List[Dict]:
        """List models for a user"""
        try:
            models = self.client.models.list()
            user_models = []
            
            for model in models:
                if hasattr(model, 'owner') and model.owner == username:
                    user_models.append({
                        "name": model.name,
                        "owner": model.owner,
                        "description": getattr(model, 'description', ''),
                        "full_name": f"{model.owner}/{model.name}"
                    })
            
            return user_models
            
        except Exception as e:
            print(f"Error listing models: {e}")
            return []


def test_api():
    """Test function to verify API functionality"""
    if not REPLICATE_AVAILABLE:
        print("❌ Replicate package not installed. Run: pip install replicate")
        return False
    
    try:
        api = ReplicatePortraitAPI()
        print("✅ API initialized successfully")
        return True
    except Exception as e:
        print(f"❌ API initialization failed: {e}")
        return False


def quick_test_with_sample():
    """Quick test with a sample image URL"""
    if not REPLICATE_AVAILABLE:
        print("❌ Replicate package not available")
        return
    
    try:
        # This is a quick test using the example from the docs
        output = replicate.run(
            "flux-kontext-apps/portrait-series",
            input={
                "background": "black",
                "num_images": 2,  # Small number for testing
                "input_image": "https://replicate.delivery/pbxt/N5DZJkCEuP5rWGtu8XcfyZj9sXzm4W3OXOSfdJnj9NmlirP2/mona-lisa.png",
                "output_format": "png",
                "randomize_images": True,
                "safety_tolerance": 1
            }
        )
        print(f"✅ Test successful! Generated {len(output)} images")
        print("Sample URLs:", output[:2])
        return True
    except Exception as e:
        print(f"❌ Test failed: {e}")
        return False


if __name__ == "__main__":
    print("🎨 Replicate Portrait Series & Fast Flux Training API")
    print("=" * 50)
    
    # Test basic initialization
    if test_api():
        print("\n🚀 API ready to use!")
        
        # Optionally run a quick test (uncomment to test)
        # print("\n🧪 Running quick test...")
        # quick_test_with_sample()
    else:
        print("\n📋 Setup instructions:")
        print("1. pip install replicate")
        print("2. Set REPLICATE_API_TOKEN environment variable")
        print("3. Get token from: https://replicate.com/account")