"""Fingerprint-based deduplication against the database."""
from __future__ import annotations

from sqlalchemy import select
from sqlalchemy.orm import Session

from gimme_job.models.db import JobPosting
from gimme_job.models.dto import JobPostingCandidate
from gimme_job.utils.hashing import compute_fingerprint


def ensure_fingerprints(candidates: list[JobPostingCandidate]) -> list[JobPostingCandidate]:
    """Compute fingerprints for any candidates that don't have one."""
    for c in candidates:
        if not c.fingerprint:
            c.fingerprint = compute_fingerprint(
                site_id=c.site_id,
                title=c.title,
                company=c.company,
                location=c.location,
                url=c.job_url,
            )
    return candidates


def deduplicate_in_batch(candidates: list[JobPostingCandidate]) -> list[JobPostingCandidate]:
    """Remove duplicates within the current batch by fingerprint."""
    seen: set[str] = set()
    result = []
    for c in candidates:
        if c.fingerprint and c.fingerprint not in seen:
            seen.add(c.fingerprint)
            result.append(c)
    return result