"""Persist GeoText patch embeddings in a Hugging Face dataset repository."""

from __future__ import annotations

import os
import tempfile
import uuid
from datetime import datetime, timezone
from typing import Any, Dict, List

import pyarrow as pa
import pyarrow.parquet as pq
from huggingface_hub import HfApi


def _repository_config() -> Dict[str, str]:
    token = os.environ.get("HF_TOKEN") or os.environ.get("HUGGING_FACE_HUB_TOKEN")
    repository = os.environ.get("HF_BUCKET")
    if not token or not repository or "/" not in repository:
        raise ValueError(
            "store_patch_embeddings=true requires HF_TOKEN (or "
            "HUGGING_FACE_HUB_TOKEN) and HF_BUCKET=namespace/repository-name"
        )
    return {"token": token, "repository": repository}


def persist_patch_embeddings(
    *, image_url: str, patches: List[Dict[str, Any]], output_prefix: str | None
) -> Dict[str, Any]:
    """Write patch vectors as Parquet and upload them through the stable Hub API."""
    config = _repository_config()
    schema = pa.schema(
        [
            pa.field("id", pa.string()),
            pa.field("image_url", pa.string()),
            pa.field("tile_index", pa.int32()),
            pa.field("patch_index", pa.int32()),
            pa.field("row", pa.int32()),
            pa.field("column", pa.int32()),
            pa.field("source_pixel_xyxy", pa.list_(pa.float32())),
            pa.field("embedding", pa.list_(pa.float32())),
        ]
    )
    rows = [
        {
            "id": f"tile_{patch.get('tile_index', 0)}_patch_{patch['patch_index']:04d}",
            "image_url": image_url,
            "tile_index": patch.get("tile_index", 0),
            "patch_index": patch["patch_index"],
            "row": patch["row"],
            "column": patch["column"],
            "source_pixel_xyxy": patch["source_pixel_xyxy"],
            "embedding": patch["embedding"],
        }
        for patch in patches
    ]
    table = pa.Table.from_pylist(rows, schema=schema)
    date = datetime.now(timezone.utc).strftime("%Y%m%d")
    prefix = output_prefix or f"geotext-patch-embeddings/{date}/{uuid.uuid4().hex}/"
    key = f"{prefix.rstrip('/')}/patch_embeddings.parquet"

    with tempfile.NamedTemporaryFile(suffix=".parquet") as artifact:
        pq.write_table(table, artifact.name, compression="zstd")
        api = HfApi(token=config["token"])
        api.create_repo(
            repo_id=config["repository"], repo_type="dataset", private=True, exist_ok=True
        )
        api.upload_file(
            path_or_fileobj=artifact.name,
            path_in_repo=key,
            repo_id=config["repository"],
            repo_type="dataset",
            commit_message="Store GeoText patch embeddings",
        )

    return {
        "provider": "huggingface_hub",
        "repository": config["repository"],
        "key": key,
        "format": "parquet",
        "row_count": len(rows),
    }