"""Background index / entity-resolution jobs, triggered from the CRM web UI.

Replaces the StartOS actions with one-click web-UI buttons. Runs the ingest
scripts as SUBPROCESSES (cwd backend/ingest) so the heavy deps (fastembed, the
Spark clients) are not imported into the CRM server process, and so each run is
isolated. One job at a time (a process-level lock); progress/result is exposed
via get_status() and surfaced in /api/system/status.

Jobs:
  rebuild_index   — full re-chunk + re-embed into Qdrant (sync.py --recreate)
  update_index    — incremental sync (sync.py)
  find_duplicates — deterministic resolution + Qwen suggestions -> review queue
"""
import os
import subprocess
import threading
from datetime import datetime, timezone

INGEST_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), "ingest")

_JOBS = {
    "rebuild_index": ["python3", "sync.py", "--recreate"],
    "update_index": ["python3", "sync.py"],
    "find_duplicates": ["python3", "fuzzy_resolve.py"],
}

_lock = threading.Lock()
_state = {"running": False, "kind": None, "started_at": None,
          "finished_at": None, "result": None, "tail": None}


def _now():
    return datetime.now(timezone.utc).replace(tzinfo=None).isoformat() + "Z"


def get_status():
    with _lock:
        return dict(_state)


def start(kind, db_path):
    if kind not in _JOBS:
        return {"error": "unknown_job", "allowed": list(_JOBS)}
    with _lock:
        if _state["running"]:
            return {"error": "job_running", "kind": _state["kind"]}
        _state.update(running=True, kind=kind, started_at=_now(),
                      finished_at=None, result=None, tail=None)
    threading.Thread(target=_run, args=(kind, db_path), daemon=True).start()
    return {"started": True, "kind": kind}


def _run(kind, db_path):
    cmd = _JOBS[kind] + ["--db", db_path]
    env = dict(os.environ)
    env["CRM_DB_PATH"] = db_path
    try:
        p = subprocess.run(cmd, cwd=INGEST_DIR, env=env, capture_output=True,
                           text=True, timeout=3600)
        tail = (p.stdout + p.stderr).strip()[-1500:]
        result = "ok" if p.returncode == 0 else f"error (exit {p.returncode})"
    except Exception as exc:  # noqa: BLE001
        tail, result = str(exc), "error"
    with _lock:
        _state.update(running=False, finished_at=_now(), result=result, tail=tail)