from __future__ import annotations

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

from bl_ocr import __version__
from bl_ocr.api.routes import router
from bl_ocr.application.service import OcrInferenceService
from bl_ocr.core.config import Settings, get_settings
from bl_ocr.ocr.client import MistralOcrClient
from bl_ocr.ocr.prompt import PromptAssets


def create_app(
    settings: Settings | None = None,
    inference_service: OcrInferenceService | None = None,
) -> FastAPI:
    settings = settings or get_settings()
    prompt_assets = PromptAssets.load(settings)
    service = inference_service or OcrInferenceService(
        MistralOcrClient(settings=settings, assets=prompt_assets),
        settings=settings,
    )

    app = FastAPI(
        title="Delivery Note OCR API",
        version=__version__,
        description="Standalone OCR and structured extraction API for delivery-note images.",
    )
    app.state.settings = settings
    app.state.prompt_assets = prompt_assets
    app.state.inference_service = service

    app.add_middleware(
        CORSMiddleware,
        allow_origins=list(settings.cors_allow_origins),
        allow_credentials=False,
        allow_methods=["GET", "POST", "OPTIONS"],
        allow_headers=["*"],
    )
    app.include_router(router)
    return app


app = create_app()