"""Service for recalculating the global status of a Technique
based on the state and result of its associated tests."""

from sqlalchemy.orm import Session

from app.models.enums import TechniqueStatus
from app.models.technique import Technique


def recalculate_technique_status(db: Session, technique: Technique) -> None:
    """Recompute ``technique.status_global`` from its tests and commit.

    Rules
    -----
    - No tests → ``not_evaluated``
    - Any test not yet ``validated`` → ``in_progress``
    - All validated and all ``detected`` → ``validated``
    - All validated and any ``partially_detected`` → ``partial``
    - Otherwise → ``not_covered``
    """
    tests = technique.tests

    if not tests:
        technique.status_global = TechniqueStatus.not_evaluated
    elif any(t.state != "validated" for t in tests):
        technique.status_global = TechniqueStatus.in_progress
    else:
        results = [t.result for t in tests]
        if all(r == "detected" for r in results):
            technique.status_global = TechniqueStatus.validated
        elif any(r == "partially_detected" for r in results):
            technique.status_global = TechniqueStatus.partial
        else:
            technique.status_global = TechniqueStatus.not_covered

    db.commit()