import os
from pathlib import Path
from typing import Any, Dict

from fastapi import Depends, FastAPI, HTTPException, Path as ApiPath

from .models import SentenceBoundaryDocument
from .store import BoundaryStore


DEFAULT_INDEX_PATH = Path(__file__).resolve().parent / "data" / "sentence_boundaries.json"


def create_app(store: BoundaryStore = None) -> FastAPI:
    application = FastAPI(
        title="Oral Trainer Sentence Boundary API",
        version="1.0.0",
        description="Looks up pre-generated sentence boundaries by video SHA-256.",
    )
    index_path = Path(os.getenv("SENTENCE_BOUNDARIES_FILE", str(DEFAULT_INDEX_PATH)))
    application.state.boundary_store = store or BoundaryStore(index_path)

    def get_store() -> BoundaryStore:
        return application.state.boundary_store

    @application.get("/healthz")
    def healthz(boundary_store: BoundaryStore = Depends(get_store)) -> Dict[str, Any]:
        return {"status": "ok", "video_count": boundary_store.count()}

    @application.get(
        "/api/v1/videos/{video_hash}/sentence-boundaries",
        response_model=SentenceBoundaryDocument,
    )
    @application.get(
        "/api/v1/sentence-boundaries/{video_hash}",
        response_model=SentenceBoundaryDocument,
        include_in_schema=False,
    )
    def get_sentence_boundaries(
        video_hash: str = ApiPath(
            min_length=64,
            max_length=64,
            pattern=r"^[A-Fa-f0-9]{64}$",
            description="SHA-256 hex digest of the exact video bytes",
        ),
        boundary_store: BoundaryStore = Depends(get_store),
    ) -> SentenceBoundaryDocument:
        document = boundary_store.get(video_hash)
        if document is None:
            raise HTTPException(
                status_code=404,
                detail={
                    "code": "SENTENCE_BOUNDARIES_NOT_FOUND",
                    "message": "No sentence boundaries are registered for this video hash.",
                },
            )
        return document

    return application


app = create_app()