"""
Lightweight Python API service for signature validation
This can run independently to support the PHP application
"""
from fastapi import FastAPI, Query
from fastapi.responses import JSONResponse
from fastapi.middleware.cors import CORSMiddleware
from bibapi import catalogue
import re
import os

app = FastAPI(title="Signature Validation API")

# Allow PHP application to call this API
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],  # In production, restrict to your PHP server domain
    allow_credentials=True,
    allow_methods=["GET"],
    allow_headers=["*"],
)

# Initialize catalogue for signature validation
cat = catalogue.Catalogue()

@app.get("/api/validate-signature")
async def validate_signature(signature: str = Query(...)):
    """Validate a book signature and return total pages"""
    try:
        book_result = cat.get_book_with_data(signature)
        if book_result and hasattr(book_result, "pages") and book_result.pages:
            # Try to extract numeric page count
            pages_str = str(book_result.pages)
            # Extract first number from pages string (e.g., "245 S." -> 245)
            match = re.search(r"(\d+)", pages_str)
            if match:
                total_pages = int(match.group(1))
                return JSONResponse(
                    {"valid": True, "total_pages": total_pages, "signature": signature}
                )

        return JSONResponse(
            {
                "valid": False,
                "error": "Signatur nicht gefunden oder keine Seitenzahl verfügbar",
                "signature": signature,
            }
        )
    except Exception as e:
        return JSONResponse(
            {
                "valid": False,
                "error": f"Fehler bei der Validierung: {str(e)}",
                "signature": signature,
            },
            status_code=500
        )

@app.get("/health")
async def health_check():
    """Health check endpoint"""
    return {"status": "ok", "service": "signature-validation"}

if __name__ == "__main__":
    import uvicorn
    port = int(os.getenv("API_PORT", "8001"))
    uvicorn.run(app, host="0.0.0.0", port=port)