"""FastAPI application entry point — ISP Handbook OCR Engine."""

from __future__ import annotations

import logging

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware

from app.api.routes import router
from app.core.config import get_settings
from app.core.logging import setup_logging

settings = get_settings()
setup_logging(settings.debug)

logger = logging.getLogger(__name__)

app = FastAPI(
    title=settings.app_name,
    version=settings.app_version,
    description="OCR extraction, editing, and export for ISP handbooks.",
    docs_url="/docs",
    redoc_url="/redoc",
    openapi_url="/openapi.json",
)

# CORS — allow configured origins
app.add_middleware(
    CORSMiddleware,
    allow_origins=settings.cors_origins_list,
    allow_credentials=False,
    allow_methods=["GET", "POST", "OPTIONS"],
    allow_headers=["*"],
    expose_headers=["Content-Disposition", "Content-Length", "Content-Type"],
)

app.include_router(router)


@app.on_event("startup")
async def startup_event():
    # Configure tesseract path if set
    if settings.tesseract_cmd:
        from app.services.ocr_extractor import configure_tesseract
        configure_tesseract(settings.tesseract_cmd)

    logger.info(
        "%s v%s starting on port %d (debug=%s)",
        settings.app_name,
        settings.app_version,
        settings.port,
        settings.debug,
    )