from fastapi import FastAPI, UploadFile, File, HTTPException
from fastapi.middleware.cors import CORSMiddleware
import os
import shutil
import tempfile
import xml.etree.ElementTree as ET
from Decipher.pt_crypto import decrypt_pkt
from Decipher.extract import extract_structured_data
from Decipher.generator import generate_network
from Decipher.models import NetworkTopology
from pydantic import Field, BaseModel

class PromptRequest(BaseModel):
    prompt: str = Field(..., description="The description of the network to generate", json_schema_extra={"example": "A network with 1 router and 2 PCs"})

app = FastAPI(title="TopoScan API", description="API for decrypting and extracting data from Cisco Packet Tracer files")

# Enable CORS
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

@app.get("/")
async def root():
    return {"message": "TopoScan API is running"}

@app.post("/analyze-pkt")
async def analyze_pkt(file: UploadFile = File(...)):
    if not file.filename.endswith(".pkt") and not file.filename.endswith(".pka"):
        raise HTTPException(status_code=400, detail="Only .pkt or .pka files are supported")

    try:
        # Read the uploaded file content
        content = await file.read()
        
        # Decrypt the file
        try:
            xml_data = decrypt_pkt(content)
        except Exception as e:
            raise HTTPException(status_code=500, detail=f"Decryption failed: {str(e)}")

        # Create a temporary file to store the XML for extraction
        with tempfile.NamedTemporaryFile(delete=False, suffix=".xml") as temp_xml:
            temp_xml.write(xml_data)
            temp_xml_path = temp_xml.name

        try:
            # Extract structured data using existing logic
            structured_data = extract_structured_data(temp_xml_path)
            
            if structured_data is None:
                raise HTTPException(status_code=500, detail="Failed to extract structured data from decrypted XML")
            
            return structured_data
            
        finally:
            # Clean up the temporary file
            if os.path.exists(temp_xml_path):
                os.remove(temp_xml_path)

    except Exception as e:
        raise HTTPException(status_code=500, detail=f"An error occurred: {str(e)}")

@app.post("/generate-network", response_model=NetworkTopology)
async def api_generate_network(request: PromptRequest):
    try:
        topology = generate_network(request.prompt)
        return topology
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Generation failed: {str(e)}")

if __name__ == "__main__":
    import uvicorn
    # Hugging Face Spaces and other cloud providers often use the PORT environment variable
    port = int(os.environ.get("PORT", 8000))
    uvicorn.run(app, host="0.0.0.0", port=port)