from __future__ import annotations

import logging
import os

from owl_imports_combiner import (
    build_combined_graph,
    output_location_to_path,
    resolve_output_location,
    serialize_graph_to_ttl,
)


logger = logging.getLogger(__name__)


def _env_bool(name: str, *, default: bool = False) -> bool:
    val = os.getenv(name)
    if val is None:
        return default
    return val.strip().lower() in {"1", "true", "yes", "y", "on"}


def main() -> None:
    logging.basicConfig(level=os.getenv("LOG_LEVEL", "INFO").upper())

    if not _env_bool("COMBINE_OWL_IMPORTS_ON_START", default=False):
        logger.info("Skipping combine step (COMBINE_OWL_IMPORTS_ON_START=false)")
        return

    entry_location = os.getenv("COMBINE_ENTRY_LOCATION") or os.getenv("TTL_PATH")
    if not entry_location:
        raise SystemExit("Set COMBINE_ENTRY_LOCATION (or TTL_PATH) to the ontology file/URL to load.")

    output_name = os.getenv("COMBINE_OUTPUT_NAME", "combined_ontology.ttl")
    output_location = resolve_output_location(
        entry_location,
        output_location=os.getenv("COMBINE_OUTPUT_LOCATION"),
        output_name=output_name,
    )

    output_path = output_location_to_path(output_location)
    force = _env_bool("COMBINE_FORCE", default=False)
    if output_path.exists() and not force:
        logger.info("Skipping combine step (output exists): %s", output_location)
        return

    graph = build_combined_graph(entry_location)
    logger.info("Finished combining imports; serializing to: %s", output_location)
    serialize_graph_to_ttl(graph, output_location)


if __name__ == "__main__":
    main()