"""Lightweight Python API service for signature validation
This can run independently to support the PHP application
"""

import os
import re

from bibapi import catalogue
from fastapi import FastAPI, Query
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse

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=["*"],
)

# Catalogue is expensive to initialize at import time; instantiate lazily
cat = None


def _get_catalogue():
    global cat
    if cat is None:
        cat = catalogue.Catalogue()
    return cat


@app.get("/api/validate-signature")
async def validate_signature(signature: str = Query(...)):
    """Validate a book signature and return total pages"""
    try:
        book_result = _get_catalogue().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: {e!s}",
                "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)