"""Persists the Agent's CFOP/IPPT write audit records (append-only). Mirrors central.app.rtc_audit's
safety model for a separate, narrower capability - no candidate preview table (candidates are
recomputed fresh from field_contract every job, never stored server-side), no rollback queue yet
(rollback is operator-triggered later, out of scope for this pass)."""
from __future__ import annotations

from .events import record_event
from .models import CfopIpptWriteAudit

MAX_AUDITS_PER_JOB = 2000
WRITE_MODES = ("DISABLED", "DRY_RUN", "APPROVAL_REQUIRED", "ENABLED")
ALLOWED_FIELDS = ("CFOP", "IPPT")


def _clip(value, size):
    return None if value is None else str(value)[:size]


def job_authorizations(installation) -> dict:
    """What the authenticated job carries to the Agent. Decided centrally per installation; the Agent
    has no local switch. DISABLED unless an installation row explicitly says otherwise (server_default)."""
    mode = installation.cfop_ippt_write_mode if installation.cfop_ippt_write_mode in WRITE_MODES else "DISABLED"
    return {"cfop_ippt_write_mode": mode}


def record_cfop_ippt_write_audits(session, *, tenant_id: int, installation, agent, job_id: int | None, cfop_ippt_apply: dict | None) -> int:
    """Stores every applied/aborted write of the job. Never trusts the Agent for identity: tenant/installation/agent come from the authenticated context."""
    if not isinstance(cfop_ippt_apply, dict):
        return 0
    records = list(cfop_ippt_apply.get("applied") or []) + list(cfop_ippt_apply.get("aborted") or [])
    stored = applied = aborted = 0
    for item in records[:MAX_AUDITS_PER_JOB]:
        if not isinstance(item, dict) or item.get("field") not in ALLOWED_FIELDS:
            continue
        outcome = str(item.get("outcome", ""))[:16]
        session.add(CfopIpptWriteAudit(
            tenant_id=tenant_id, installation_id=installation.id, agent_id=agent.id, job_id=job_id,
            product_code=_clip(item.get("product_code"), 64) or "", field=item["field"], outcome=outcome,
            reason=_clip(item.get("reason") or item.get("reason_code"), 96), old_value=_clip(item.get("old_value"), 16), new_value=_clip(item.get("new_value"), 16),
            action="APPLY", written_at=_clip(item.get("timestamp"), 40)))
        stored += 1
        if outcome == "APPLIED":
            applied += 1
        else:
            aborted += 1
    if stored:
        record_event(session, tenant_id=tenant_id, installation_id=installation.id, agent_id=agent.id, severity="WARNING" if applied else "INFO", event_type="CFOP_IPPT_AUTO_APPLY", job_id=job_id,
                     message=f"CFOP/IPPT: {applied} aplicado(s), {aborted} abortado(s)",
                     context={"applied": applied, "aborted": aborted, "reasons": cfop_ippt_apply.get("aborted_reasons") or {}, "mode": cfop_ippt_apply.get("mode")})
    session.commit()
    return stored