"""Periodic batch glean scheduler with optional CF submission.

Runs glean_sources on a configurable interval (TURNSTONE_GLEAN_INTERVAL env var,
default 900s / 15 min). Set to 0 to disable.

When TURNSTONE_SUBMIT_ENDPOINT is set, pushes pattern-matched entries to a remote
Turnstone instance (the CF receiving store) after each glean run.
"""
from __future__ import annotations

import asyncio
import json
import logging
from app.db import get_conn, resolve_tenant_id
from dataclasses import dataclass, field
from datetime import datetime, timedelta, timezone
from pathlib import Path
from typing import Any

import httpx

from app.glean.pipeline import glean_sources
from app.tasks.anomaly_scorer import run_once as _run_scorer
from app.tasks.cybersec_scorer import run_once as _run_cybersec
from app.tasks.incident_detector import run_once as _run_incident_detector

logger = logging.getLogger(__name__)

_lock = asyncio.Lock()


@dataclass
class IngestState:
    last_run_at: str | None = None
    last_duration_s: float | None = None
    last_stats: dict[str, int] = field(default_factory=dict)
    last_error: str | None = None
    run_count: int = 0
    next_run_at: str | None = None
    running: bool = False
    last_submitted_at: str | None = None
    last_submit_count: int = 0
    last_submit_error: str | None = None


_state = IngestState()


def get_state() -> IngestState:
    return _state


def _query_matched_since(db_path: Path, since: str | None) -> list[dict]:
    """Return entries with non-empty matched_patterns, optionally filtered by ingest_time."""
    tid = resolve_tenant_id()
    with get_conn(db_path) as conn:
        if since:
            rows = conn.execute(
                """
                SELECT id, source_id, sequence, timestamp_raw, timestamp_iso,
                       ingest_time, severity, repeat_count, out_of_order,
                       matched_patterns, text
                FROM log_entries
                WHERE matched_patterns != '[]'
                  AND ingest_time > ?
                  AND (tenant_id = ? OR tenant_id = '')
                ORDER BY ingest_time
                LIMIT 5000
                """,
                (since, tid),
            ).fetchall()
        else:
            rows = conn.execute(
                """
                SELECT id, source_id, sequence, timestamp_raw, timestamp_iso,
                       ingest_time, severity, repeat_count, out_of_order,
                       matched_patterns, text
                FROM log_entries
                WHERE matched_patterns != '[]'
                  AND (tenant_id = ? OR tenant_id = '')
                ORDER BY ingest_time DESC
                LIMIT 5000
                """,
                (tid,),
            ).fetchall()
    return [dict(r) for r in rows]


async def submit_matched(
    db_path: Path,
    submit_endpoint: str,
    source_host: str,
    since: str | None = None,
) -> dict[str, Any]:
    """Push pattern-matched entries to the remote CF receiving instance."""
    loop = asyncio.get_running_loop()
    entries = await loop.run_in_executor(
        None, lambda: _query_matched_since(db_path, since)
    )
    if not entries:
        return {"ok": True, "submitted": 0, "skipped": True}

    url = f"{submit_endpoint.rstrip('/')}/turnstone/api/glean/batch"
    payload = {"source_host": source_host, "entries": entries}
    try:
        async with httpx.AsyncClient(timeout=30.0) as client:
            resp = await client.post(url, json=payload)
            resp.raise_for_status()
        result = resp.json()
        submitted = result.get("gleaned", len(entries))
        _state.last_submitted_at = datetime.now(tz=timezone.utc).isoformat()
        _state.last_submit_count = submitted
        _state.last_submit_error = None
        logger.info("Submitted %d matched entries to %s", submitted, submit_endpoint)
        return {"ok": True, "submitted": submitted}
    except Exception as exc:
        _state.last_submit_error = str(exc)
        logger.warning("Submission to %s failed: %s", submit_endpoint, exc)
        return {"ok": False, "error": str(exc)}


async def run_once(
    sources_file: Path,
    db_path: Path,
    pattern_file: Path | None = None,
    submit_endpoint: str | None = None,
    source_host: str = "unknown",
    force: bool = False,
    anomaly_model: str = "",
    anomaly_device: str = "cpu",
    anomaly_threshold: float = 0.75,
    cybersec_model: str = "",
    cybersec_device: str = "cpu",
    cybersec_threshold: float = 0.60,
    incidents_db_path: Path | None = None,
    auto_incident: bool = True,
) -> dict[str, Any]:
    """Ingest all sources once, then submit matched entries if configured.

    Pass ``force=True`` to bypass fingerprint checks and re-glean all local
    file sources regardless of whether they appear unchanged.
    """
    if _lock.locked():
        return {"ok": False, "error": "glean already running", "skipped": True}

    async with _lock:
        _state.running = True
        started = datetime.now(tz=timezone.utc)
        try:
            loop = asyncio.get_running_loop()
            stats: dict[str, int] = await loop.run_in_executor(
                None,
                lambda: glean_sources(sources_file, db_path, pattern_file, force=force),
            )
            duration = (datetime.now(tz=timezone.utc) - started).total_seconds()
            _state.last_run_at = started.isoformat()
            _state.last_duration_s = round(duration, 2)
            _state.last_stats = stats
            _state.last_error = None
            _state.run_count += 1
            logger.info("Batch glean complete in %.1fs — %s", duration, stats)
        except Exception as exc:
            duration = (datetime.now(tz=timezone.utc) - started).total_seconds()
            _state.last_run_at = started.isoformat()
            _state.last_duration_s = round(duration, 2)
            _state.last_error = str(exc)
            _state.run_count += 1
            logger.error("Batch glean failed: %s", exc)
            _state.running = False
            return {"ok": False, "error": str(exc)}
        finally:
            _state.running = False

    if submit_endpoint:
        await submit_matched(db_path, submit_endpoint, source_host, since=_state.last_submitted_at)

    if anomaly_model:
        await _run_scorer(db_path, anomaly_model, anomaly_device, threshold=anomaly_threshold)

    if cybersec_model:
        await _run_cybersec(db_path, cybersec_model, cybersec_device, threshold=cybersec_threshold)

    if auto_incident and incidents_db_path:
        glean_started_iso = _state.last_run_at
        result = await _run_incident_detector(db_path, incidents_db_path, since=glean_started_iso)
        if result["created"]:
            logger.info("Incident detector: %d incident(s) auto-created", result["created"])

    return {"ok": True, "stats": _state.last_stats, "duration_s": _state.last_duration_s}


async def scheduler_loop(
    sources_file: Path,
    db_path: Path,
    pattern_file: Path | None,
    interval_s: int,
    submit_endpoint: str | None = None,
    source_host: str = "unknown",
    anomaly_model: str = "",
    anomaly_device: str = "cpu",
    anomaly_threshold: float = 0.75,
    cybersec_model: str = "",
    cybersec_device: str = "cpu",
    cybersec_threshold: float = 0.60,
    incidents_db_path: Path | None = None,
    auto_incident: bool = True,
) -> None:
    """Run glean + optional submission + optional anomaly/cybersec scoring every interval_s seconds."""
    logger.info("Ingest scheduler started — interval %ds, sources: %s", interval_s, sources_file)
    if submit_endpoint:
        logger.info("Submission enabled — endpoint: %s", submit_endpoint)
    if anomaly_model:
        logger.info("Anomaly scoring enabled — model: %s", anomaly_model)
    if cybersec_model:
        logger.info("Cybersec scoring enabled — model: %s", cybersec_model)
    if auto_incident and incidents_db_path:
        logger.info("Auto-incident detection enabled")
    while True:
        await run_once(
            sources_file, db_path, pattern_file, submit_endpoint, source_host,
            anomaly_model=anomaly_model,
            anomaly_device=anomaly_device,
            anomaly_threshold=anomaly_threshold,
            cybersec_model=cybersec_model,
            cybersec_device=cybersec_device,
            cybersec_threshold=cybersec_threshold,
            incidents_db_path=incidents_db_path,
            auto_incident=auto_incident,
        )
        next_run = datetime.now(tz=timezone.utc) + timedelta(seconds=interval_s)
        _state.next_run_at = next_run.isoformat()
        try:
            await asyncio.sleep(interval_s)
        except asyncio.CancelledError:
            logger.info("Ingest scheduler cancelled")
            _state.next_run_at = None
            raise