from fastapi import FastAPI, HTTPException, UploadFile, File, Response
from pydantic import BaseModel
import requests
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles
from fastapi.responses import HTMLResponse
import uuid
from pathlib import Path
import logging
import os
import stat

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

app = FastAPI()

# Add CORS middleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],  # Adjust for production
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Mount static directory for serving files
STATIC_DIR = Path("/home/user/app/static")
STATIC_DIR.mkdir(parents=True, exist_ok=True)
# Set directory permissions to ensure accessibility
try:
    os.chmod(STATIC_DIR, stat.S_IRWXU | stat.S_IRWXG | stat.S_IROTH | stat.S_IXOTH)
except Exception as e:
    logger.error(f"Failed to set permissions for {STATIC_DIR}: {str(e)}")
app.mount("/static", StaticFiles(directory=STATIC_DIR), name="static")

# Alternative directory (uncomment to use /tmp/gradio)
# STATIC_DIR = Path("/tmp/gradio")
# STATIC_DIR.mkdir(parents=True, exist_ok=True)

# Define the request model
class TryOnRequest(BaseModel):
    garmentDesc: str
    category: str

# Allowed file extensions
ALLOWED_EXTENSIONS = {".jpg", ".jpeg", ".png"}

# Helper function to save file and generate public URL
async def save_file_and_get_url(file: UploadFile) -> str:
    try:
        # Validate file extension
        file_extension = f".{file.filename.split('.')[-1].lower()}"
        if file_extension not in ALLOWED_EXTENSIONS:
            logger.error(f"Invalid file extension for {file.filename}: {file_extension}")
            raise HTTPException(status_code=400, detail=f"File extension {file_extension} not allowed. Use JPG or PNG.")

        # Generate unique filename
        unique_filename = f"{uuid.uuid4()}{file_extension}"
        file_path = STATIC_DIR / unique_filename
        
        # Save file
        logger.info(f"Saving file to {file_path}")
        with file_path.open("wb") as buffer:
            content = await file.read()
            buffer.write(content)
        
        # Verify file exists and set permissions
        if not file_path.exists():
            logger.error(f"File {file_path} was not saved correctly")
            raise HTTPException(status_code=500, detail="Failed to save file")
        try:
            os.chmod(file_path, stat.S_IRWXU | stat.S_IRWXG | stat.S_IROTH)
            logger.info(f"Set permissions for {file_path}")
        except Exception as e:
            logger.error(f"Failed to set permissions for {file_path}: {str(e)}")
        
        # Generate public URL
        space_id = "tejani-tryapi"
        public_url = f"https://{space_id}.hf.space/static/{unique_filename}"
        # Alternative URL for /tmp/gradio (uncomment if using /tmp/gradio)
        # public_url = f"https://{space_id}.hf.space/file={str(file_path)}"
        logger.info(f"Generated public URL: {public_url}")
        
        # Test URL accessibility
        try:
            response = requests.head(public_url, timeout=20)
            if response.status_code != 200:
                logger.warning(f"Public URL {public_url} returned status {response.status_code}")
            else:
                logger.info(f"Public URL {public_url} is accessible")
        except requests.exceptions.RequestException as e:
            logger.error(f"Failed to access public URL {public_url}: {str(e)}")
        
        return public_url
    except Exception as e:
        logger.error(f"Error in save_file_and_get_url: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Error processing file: {str(e)}")

# Endpoint to handle file uploads and proxy the request
@app.post("/try-on")
async def try_on(
    human_img: UploadFile = File(...),
    garment: UploadFile = File(...),
    garment_desc: str = "",
    category: str = "upper_body"
):
    try:
        # Save files and get public URLs
        human_img_url = await save_file_and_get_url(human_img)
        garment_url = await save_file_and_get_url(garment)
        
        # Original API endpoint
        url = "https://changeclothesai.online/api/try-on/"
        
        headers = {
            "accept": "*/*",
            "f": "sdfdsfsKaVgUoxa5j1jzcFtziPx",
        }
        
        data = {
            "humanImg": human_img_url,
            "garment": garment_url,
            "garmentDesc": garment_desc,
            "category": category
        }
        
        logger.info(f"Forwarding request to {url} with data: {data}")
        
        # Forward request to the original API
        response = requests.post(url, headers=headers, cookies={}, data=data)
        response.raise_for_status()
        
        return {
            "status_code": response.status_code,
            "response": response.json() if response.headers.get('content-type') == 'application/json' else response.text,
            "human_img_url": human_img_url,
            "garment_url": garment_url
        }
    except requests.exceptions.RequestException as e:
        logger.error(f"Error forwarding request: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Error forwarding request: {str(e)}")
    except Exception as e:
        logger.error(f"Error in try_on endpoint: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Error processing request: {str(e)}")

# Health check endpoint
@app.get("/")
async def root():
    return {"message": "FastAPI proxy for try-on API with file upload is running"}

# Debug endpoint to list stored files
@app.get("/list-files")
async def list_files():
    try:
        files = [str(f) for f in STATIC_DIR.glob("*") if f.is_file()]
        logger.info(f"Files in {STATIC_DIR}: {files}")
        return {"files": files}
    except Exception as e:
        logger.error(f"Error listing files: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Error listing files: {str(e)}")

# Debug endpoint to manually serve a file
@app.get("/get-file/{filename}")
async def get_file(filename: str):
    try:
        file_path = STATIC_DIR / filename
        if not file_path.exists():
            logger.error(f"File {file_path} not found")
            raise HTTPException(status_code=404, detail="File not found")
        
        with file_path.open("rb") as f:
            content = f.read()
        return Response(content=content, media_type="image/jpeg")
    except Exception as e:
        logger.error(f"Error serving file {filename}: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Error serving file: {str(e)}")

# Debug endpoint to check file existence and permissions
@app.get("/check-file/{filename}")
async def check_file(filename: str):
    try:
        file_path = STATIC_DIR / filename
        if not file_path.exists():
            logger.error(f"File {file_path} not found")
            raise HTTPException(status_code=404, detail="File not found")
        
        stats = os.stat(file_path)
        permissions = oct(stats.st_mode)[-3:]
        logger.info(f"File {file_path} exists with permissions {permissions}")
        return {
            "file": str(file_path),
            "exists": True,
            "permissions": permissions
        }
    except Exception as e:
        logger.error(f"Error checking file {filename}: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Error checking file: {str(e)}")

# Endpoint to clean stored files
@app.get("/clean-files")
async def clean_files():
    try:
        for f in STATIC_DIR.glob("*"):
            if f.is_file():
                f.unlink()
        logger.info(f"Cleaned all files in {STATIC_DIR}")
        return {"message": "Files cleaned"}
    except Exception as e:
        logger.error(f"Error cleaning files: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Error cleaning files: {str(e)}")

# Frontend for testing file uploads
@app.get("/test-upload", response_class=HTMLResponse)
async def test_upload_form():
    html_content = """
    <html>
        <head>
            <title>Test File Upload</title>
            <style>
                body { font-family: Arial, sans-serif; margin: 20px; }
                .response { margin-top: 20px; padding: 10px; border: 1px solid #ccc; }
            </style>
        </head>
        <body>
            <h1>Test File Upload</h1>
            <form action="/try-on" method="post" enctype="multipart/form-data" onsubmit="showResponse(event)">
                <label for="human_img">Human Image (JPG/PNG):</label><br>
                <input type="file" id="human_img" name="human_img" accept=".jpg,.jpeg,.png" required><br><br>
                <label for="garment">Garment Image (JPG/PNG):</label><br>
                <input type="file" id="garment" name="garment" accept=".jpg,.jpeg,.png" required><br><br>
                <label for="garment_desc">Garment Description:</label><br>
                <input type="text" id="garment_desc" name="garment_desc" value=""><br><br>
                <label for="category">Category:</label><br>
                <input type="text" id="category" name="category" value="upper_body"><br><br>
                <input type="submit" value="Upload and Try On">
            </form>
            <div id="response" class="response" style="display: none;"></div>
            <h2>Debug Tools</h2>
            <p><a href="/list-files">List Stored Files</a></p>
            <p><a href="/clean-files">Clean Stored Files</a></p>
            <script>
                async function showResponse(event) {
                    event.preventDefault();
                    const form = event.target;
                    const formData = new FormData(form);
                    try {
                        const response = await fetch('/try-on', {
                            method: 'POST',
                            body: formData
                        });
                        const result = await response.json();
                        const responseDiv = document.getElementById('response');
                        responseDiv.style.display = 'block';
                        responseDiv.innerHTML = `
                            <h3>Response</h3>
                            <p><strong>Status Code:</strong> ${result.status_code}</p>
                            <p><strong>Human Image URL:</strong> <a href="${result.human_img_url}" target="_blank">${result.human_img_url}</a></p>
                            <p><strong>Garment URL:</strong> <a href="${result.garment_url}" target="_blank">${result.garment_url}</a></p>
                            <p><strong>API Response:</strong> <pre>${JSON.stringify(result.response, null, 2)}</pre></p>
                        `;
                    } catch (error) {
                        document.getElementById('response').style.display = 'block';
                        document.getElementById('response').innerHTML = `<p><strong>Error:</strong> ${error.message}</p>`;
                    }
                }
            </script>
        </body>
    </html>
    """
    return HTMLResponse(content=html_content)