import logging
from fastapi import FastAPI, UploadFile, File, HTTPException, Form, Request
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import FileResponse, JSONResponse
import requests
import base64
import os
import time
import jwt
from pathlib import Path
from typing import List
import io
import razorpay
from razorpay.errors import SignatureVerificationError

# Configure logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Initialize FastAPI app
app = FastAPI(title="Kling AI Multi-Image Generator API with Razorpay")

# Enable CORS for the frontend
app.add_middleware(
    CORSMiddleware,
    allow_origins=["https://hivili.web.app"],  # Update with your frontend URL
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# ===== API CONFIGURATION =====
ACCESS_KEY_ID = os.getenv("ACCESS_KEY_ID", "AFyHfnQATghFdCMyAG3gRPbNY4TNKFGB")
ACCESS_KEY_SECRET = os.getenv("ACCESS_KEY_SECRET", "TTepeLyBterLNM3brYPGmdndBnnyKJBA")
API_BASE_URL = "https://api-singapore.klingai.com"
CREATE_TASK_ENDPOINT = f"{API_BASE_URL}/v1/images/multi-image2image"

# ===== RAZORPAY CONFIGURATION =====
RAZORPAY_KEY_ID = os.getenv("RAZORPAY_KEY_ID")  # Set in environment variables
RAZORPAY_KEY_SECRET = os.getenv("RAZORPAY_KEY_SECRET")  # Set in environment variables
razorpay_client = razorpay.Client(auth=(RAZORPAY_KEY_ID, RAZORPAY_KEY_SECRET))

# ===== AUTHENTICATION =====
def generate_jwt_token():
    """Generate JWT token for API authentication"""
    payload = {
        "iss": ACCESS_KEY_ID,
        "exp": int(time.time()) + 1800,  # 30 minutes expiration
        "nbf": int(time.time()) - 5      # Not before 5 seconds ago
    }
    return jwt.encode(payload, ACCESS_KEY_SECRET, algorithm="HS256")

# ===== IMAGE PROCESSING =====
def prepare_image_base64(image_content: bytes):
    """Convert image bytes to base64 without prefix"""
    try:
        return base64.b64encode(image_content).decode('utf-8')
    except Exception as e:
        logger.error(f"Image processing failed: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Image processing failed: {str(e)}")

def validate_image(image_content: bytes):
    """Validate image meets API requirements"""
    try:
        size_mb = len(image_content) / (1024 * 1024)
        if size_mb > 10:
            raise HTTPException(status_code=400, detail="Image too large (max 10MB)")
        return True, ""
    except Exception as e:
        raise HTTPException(status_code=400, detail=f"Image validation error: {str(e)}")

# ===== API FUNCTIONS =====
def create_multi_image_task(subject_images: List[bytes], prompt: str):
    """Create multi-image generation task"""
    headers = {
        "Authorization": f"Bearer {generate_jwt_token()}",
        "Content-Type": "application/json"
    }
    
    subject_image_list = []
    for img_content in subject_images:
        if img_content:
            base64_img = prepare_image_base64(img_content)
            if base64_img:
                subject_image_list.append({"subject_image": base64_img})
    
    if len(subject_image_list) < 2:
        raise HTTPException(status_code=400, detail="At least 2 subject images required")
    
    payload = {
        "model_name": "kling-v2",
        "prompt": prompt,
        "subject_image_list": subject_image_list,
        "n": 1,
        "aspect_ratio": "1:1"
    }
    
    try:
        response = requests.post(CREATE_TASK_ENDPOINT, json=payload, headers=headers)
        response.raise_for_status()
        return response.json()
    except requests.exceptions.RequestException as e:
        logger.error(f"API request failed: {str(e)}")
        if hasattr(e, 'response') and e.response:
            logger.error(f"API response: {e.response.text}")
        raise HTTPException(status_code=500, detail=f"API Error: {str(e)}")

def check_task_status(task_id: str):
    """Check task completion status"""
    headers = {"Authorization": f"Bearer {generate_jwt_token()}"}
    status_url = f"{API_BASE_URL}/v1/images/multi-image2image/{task_id}"
    
    try:
        response = requests.get(status_url, headers=headers)
        response.raise_for_status()
        return response.json()
    except requests.exceptions.RequestException as e:
        raise HTTPException(status_code=500, detail=f"Status check failed: {str(e)}")

# ===== RAZORPAY FUNCTIONS =====
def create_razorpay_order(amount: int, currency: str = "INR"):
    """Create a Razorpay order"""
    try:
        order_data = {
            "amount": amount * 100,  # Amount in paise (e.g., 500 INR = 50000 paise)
            "currency": currency,
            "payment_capture": 1  # Auto-capture payment
        }
        order = razorpay_client.order.create(data=order_data)
        return order
    except Exception as e:
        logger.error(f"Failed to create Razorpay order: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Failed to create order: {str(e)}")

def verify_payment_signature(order_id: str, payment_id: str, signature: str):
    """Verify Razorpay payment signature"""
    try:
        params_dict = {
            "razorpay_order_id": order_id,
            "razorpay_payment_id": payment_id,
            "razorpay_signature": signature
        }
        razorpay_client.utility.verify_payment_signature(params_dict)
        return True
    except SignatureVerificationError as e:
        logger.error(f"Payment signature verification failed: {str(e)}")
        return False
    except Exception as e:
        logger.error(f"Error verifying payment signature: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Verification error: {str(e)}")

# ===== MAIN PROCESSING =====
async def generate_image(subject_images: List[bytes], prompt: str):
    """Handle complete image generation workflow"""
    for img_content in subject_images:
        if img_content:
            validate_image(img_content)
    
    task_response = create_multi_image_task(subject_images, prompt)
    if task_response.get("code") != 0:
        raise HTTPException(status_code=500, detail=f"API error: {task_response.get('message', 'Unknown error')}")
    
    task_id = task_response["data"]["task_id"]
    logger.info(f"Task created: {task_id}")
    
    for _ in range(60):
        task_data = check_task_status(task_id)
        status = task_data["data"]["task_status"]
        
        if status == "succeed":
            image_url = task_data["data"]["task_result"]["images"][0]["url"]
            try:
                response = requests.get(image_url)
                response.raise_for_status()
                output_dir = Path("/tmp")
                output_dir.mkdir(exist_ok=True)
                output_path = output_dir / f"kling_output_{task_id}.png"
                with open(output_path, "wb") as f:
                    f.write(response.content)
                return output_path
            except Exception as e:
                raise HTTPException(status_code=500, detail=f"Failed to download result: {str(e)}")
                
        elif status in ("failed", "canceled"):
            error_msg = task_data["data"].get("task_status_msg", "Unknown error")
            raise HTTPException(status_code=500, detail=f"Task failed: {error_msg}")
            
        time.sleep(10)
    
    raise HTTPException(status_code=500, detail="Task timed out after 10 minutes")

# ===== API ENDPOINTS =====
@app.post("/generate")
async def generate_image_endpoint(
    prompt: str = Form(...),
    images: List[UploadFile] = File(...)
):
    """Endpoint to generate an image from multiple input images and a prompt"""
    try:
        if len(images) < 2:
            raise HTTPException(status_code=400, detail="At least 2 images are required")
        if len(images) > 4:
            raise HTTPException(status_code=400, detail="Maximum 4 images allowed")

        image_contents = [await image.read() for image in images]
        output_path = await generate_image(image_contents, prompt)

        return FileResponse(
            path=output_path,
            media_type="image/png",
            filename=f"kling_output_{Path(output_path).stem}.png"
        )
    except Exception as e:
        logger.error(f"Error in /generate: {str(e)}")
        raise HTTPException(status_code=500, detail=str(e))

@app.post("/create-order")
async def create_order(amount: int = Form(...)):
    """Create a Razorpay order for payment"""
    if not RAZORPAY_KEY_ID or not RAZORPAY_KEY_SECRET:
        raise HTTPException(status_code=500, detail="Razorpay configuration missing")
    
    try:
        order = create_razorpay_order(amount)
        return JSONResponse(content={
            "order_id": order["id"],
            "amount": order["amount"],
            "currency": order["currency"],
            "key_id": RAZORPAY_KEY_ID
        })
    except Exception as e:
        logger.error(f"Error creating order: {str(e)}")
        raise HTTPException(status_code=500, detail=str(e))

@app.post("/verify-payment")
async def verify_payment(
    razorpay_order_id: str = Form(...),
    razorpay_payment_id: str = Form(...),
    razorpay_signature: str = Form(...)
):
    """Verify Razorpay payment signature"""
    try:
        is_valid = verify_payment_signature(razorpay_order_id, razorpay_payment_id, razorpay_signature)
        if is_valid:
            # Here you can update user subscription status in your database
            # For example, update a user's plan to "premium" or increment credits
            return JSONResponse(content={"status": "success", "message": "Payment verified successfully"})
        else:
            raise HTTPException(status_code=400, detail="Payment verification failed")
    except Exception as e:
        logger.error(f"Error verifying payment: {str(e)}")
        raise HTTPException(status_code=500, detail=str(e))

@app.get("/")
async def index():
    return {"status": "Kling AI Multi-Image Generator API with Razorpay is running"}

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=7860)