"""
Burn-in orchestrator.

Manages a FIFO queue of burn-in jobs capped at MAX_PARALLEL_BURNINS concurrent
executions. Each job runs stages sequentially; a failed stage aborts the job.

State is persisted to SQLite throughout — DB is source of truth.

On startup:
  - Any 'running' jobs from a previous run are marked 'unknown' (interrupted).
  - Any 'queued' jobs are re-enqueued automatically.

Cancellation:
  - cancel_job() sets DB state to 'cancelled'.
  - Running stage coroutines check _is_cancelled() at POLL_INTERVAL boundaries
    and abort within a few seconds of the cancel request.
"""

import asyncio
import logging
import time
from datetime import datetime, timezone

import aiosqlite

from app.config import settings
from app.truenas import TrueNASClient

log = logging.getLogger(__name__)

# ---------------------------------------------------------------------------
# Stage definitions
# ---------------------------------------------------------------------------

STAGE_ORDER: dict[str, list[str]] = {
    # Legacy
    "quick":         ["precheck", "short_smart", "io_validate", "final_check"],
    # Single-stage selectable profiles
    "surface":       ["precheck", "surface_validate", "final_check"],
    "short":         ["precheck", "short_smart", "final_check"],
    "long":          ["precheck", "long_smart", "final_check"],
    # Two-stage combos
    "surface_short": ["precheck", "surface_validate", "short_smart", "final_check"],
    "surface_long":  ["precheck", "surface_validate", "long_smart", "final_check"],
    "short_long":    ["precheck", "short_smart", "long_smart", "final_check"],
    # All three
    "full":          ["precheck", "surface_validate", "short_smart", "long_smart", "final_check"],
}

# Per-stage base weights used to compute overall job % progress dynamically
_STAGE_BASE_WEIGHTS: dict[str, int] = {
    "precheck":         5,
    "surface_validate": 65,
    "short_smart":      12,
    "long_smart":       13,
    "io_validate":      10,
    "final_check":       5,
}

POLL_INTERVAL = 5.0  # seconds between progress checks during active stages

# ---------------------------------------------------------------------------
# Module-level state (initialized in init())
# ---------------------------------------------------------------------------

_semaphore: asyncio.Semaphore | None = None
_client: TrueNASClient | None = None


def _now() -> str:
    return datetime.now(timezone.utc).isoformat()


def _db():
    """Open a fresh WAL-mode connection. Caller must use 'async with'."""
    return aiosqlite.connect(settings.db_path)


# ---------------------------------------------------------------------------
# Init + startup reconciliation
# ---------------------------------------------------------------------------

async def init(client: TrueNASClient) -> None:
    global _semaphore, _client
    _semaphore = asyncio.Semaphore(settings.max_parallel_burnins)
    _client = client

    async with _db() as db:
        db.row_factory = aiosqlite.Row
        await db.execute("PRAGMA journal_mode=WAL")
        await db.execute("PRAGMA foreign_keys=ON")

        # Mark interrupted running jobs as unknown
        await db.execute(
            "UPDATE burnin_jobs SET state='unknown', finished_at=? WHERE state='running'",
            (_now(),),
        )

        # Re-enqueue previously queued jobs
        cur = await db.execute(
            "SELECT id FROM burnin_jobs WHERE state='queued' ORDER BY created_at"
        )
        queued = [r["id"] for r in await cur.fetchall()]
        await db.commit()

    for job_id in queued:
        asyncio.create_task(_run_job(job_id))

    log.info("Burn-in orchestrator ready (max_concurrent=%d)", settings.max_parallel_burnins)


# ---------------------------------------------------------------------------
# Public API
# ---------------------------------------------------------------------------

async def start_job(drive_id: int, profile: str, operator: str,
                    stage_order: list[str] | None = None) -> int:
    """Create and enqueue a burn-in job. Returns the new job ID.

    If stage_order is provided (e.g. ["short_smart","long_smart","surface_validate"]),
    the job runs those stages in that order (precheck and final_check are always prepended/appended).
    Otherwise the preset STAGE_ORDER[profile] is used.
    """
    now = _now()

    # Build the actual stage list
    if stage_order is not None:
        stages = ["precheck"] + list(stage_order) + ["final_check"]
    else:
        stages = STAGE_ORDER[profile]

    async with _db() as db:
        db.row_factory = aiosqlite.Row
        await db.execute("PRAGMA journal_mode=WAL")
        await db.execute("PRAGMA foreign_keys=ON")

        # Reject duplicate active burn-in for same drive
        cur = await db.execute(
            "SELECT COUNT(*) FROM burnin_jobs WHERE drive_id=? AND state IN ('queued','running')",
            (drive_id,),
        )
        if (await cur.fetchone())[0] > 0:
            raise ValueError("Drive already has an active burn-in job")

        # Create job
        cur = await db.execute(
            """INSERT INTO burnin_jobs (drive_id, profile, state, percent, operator, created_at)
               VALUES (?,?,?,?,?,?) RETURNING id""",
            (drive_id, profile, "queued", 0, operator, now),
        )
        job_id = (await cur.fetchone())["id"]

        # Create stage rows in the desired execution order
        for stage_name in stages:
            await db.execute(
                "INSERT INTO burnin_stages (burnin_job_id, stage_name, state) VALUES (?,?,?)",
                (job_id, stage_name, "pending"),
            )

        await db.execute(
            """INSERT INTO audit_events (event_type, drive_id, burnin_job_id, operator, message)
               VALUES (?,?,?,?,?)""",
            ("burnin_queued", drive_id, job_id, operator, f"Queued {profile} burn-in"),
        )
        await db.commit()

    asyncio.create_task(_run_job(job_id))
    log.info("Burn-in job %d queued (drive_id=%d profile=%s operator=%s)",
             job_id, drive_id, profile, operator)
    return job_id


async def cancel_job(job_id: int, operator: str) -> bool:
    """Cancel a queued or running job. Returns True if state was changed."""
    async with _db() as db:
        db.row_factory = aiosqlite.Row
        await db.execute("PRAGMA journal_mode=WAL")

        cur = await db.execute(
            "SELECT state, drive_id FROM burnin_jobs WHERE id=?", (job_id,)
        )
        row = await cur.fetchone()
        if not row or row["state"] not in ("queued", "running"):
            return False

        await db.execute(
            "UPDATE burnin_jobs SET state='cancelled', finished_at=? WHERE id=?",
            (_now(), job_id),
        )
        await db.execute(
            "UPDATE burnin_stages SET state='cancelled' WHERE burnin_job_id=? AND state IN ('pending','running')",
            (job_id,),
        )
        await db.execute(
            """INSERT INTO audit_events (event_type, drive_id, burnin_job_id, operator, message)
               VALUES (?,?,?,?,?)""",
            ("burnin_cancelled", row["drive_id"], job_id, operator, "Cancelled by operator"),
        )
        await db.commit()

    log.info("Burn-in job %d cancelled by %s", job_id, operator)
    return True


# ---------------------------------------------------------------------------
# Job runner
# ---------------------------------------------------------------------------

async def _run_job(job_id: int) -> None:
    """Acquire semaphore slot, execute all stages, persist final state."""
    assert _semaphore is not None, "burnin.init() not called"

    async with _semaphore:
        if await _is_cancelled(job_id):
            return

        # Transition queued → running
        async with _db() as db:
            await db.execute("PRAGMA journal_mode=WAL")
            row = await (await db.execute(
                "SELECT drive_id, profile FROM burnin_jobs WHERE id=?", (job_id,)
            )).fetchone()
            if not row:
                return
            drive_id, profile = row[0], row[1]

            cur = await db.execute("SELECT devname, serial, model FROM drives WHERE id=?", (drive_id,))
            devname_row = await cur.fetchone()
            if not devname_row:
                return
            devname      = devname_row[0]
            drive_serial = devname_row[1]
            drive_model  = devname_row[2]

            await db.execute(
                "UPDATE burnin_jobs SET state='running', started_at=? WHERE id=?",
                (_now(), job_id),
            )
            await db.execute(
                """INSERT INTO audit_events (event_type, drive_id, burnin_job_id, operator, message)
                   VALUES (?,?,?,(SELECT operator FROM burnin_jobs WHERE id=?),?)""",
                ("burnin_started", drive_id, job_id, job_id, f"Started {profile} burn-in on {devname}"),
            )
            # Read stage order from DB (respects any custom order set at job creation)
            stage_cur = await db.execute(
                "SELECT stage_name FROM burnin_stages WHERE burnin_job_id=? ORDER BY id",
                (job_id,),
            )
            job_stages = [r[0] for r in await stage_cur.fetchall()]
            await db.commit()

        _push_update()
        log.info("Burn-in started", extra={"job_id": job_id, "devname": devname, "profile": profile})

        success = False
        error_text = None
        try:
            success = await _execute_stages(job_id, job_stages, devname, drive_id)
        except asyncio.CancelledError:
            pass
        except Exception as exc:
            error_text = str(exc)
            log.exception("Burn-in raised exception", extra={"job_id": job_id, "devname": devname})

        if await _is_cancelled(job_id):
            return

        final_state = "passed" if success else "failed"
        async with _db() as db:
            await db.execute("PRAGMA journal_mode=WAL")
            await db.execute(
                "UPDATE burnin_jobs SET state=?, percent=?, finished_at=?, error_text=? WHERE id=?",
                (final_state, 100 if success else None, _now(), error_text, job_id),
            )
            await db.execute(
                """INSERT INTO audit_events (event_type, drive_id, burnin_job_id, operator, message)
                   VALUES (?,?,?,(SELECT operator FROM burnin_jobs WHERE id=?),?)""",
                (f"burnin_{final_state}", drive_id, job_id, job_id,
                 f"Burn-in {final_state} on {devname}"),
            )
            await db.commit()

        # Build SSE alert for browser notifications
        alert = {
            "state":      final_state,
            "job_id":     job_id,
            "devname":    devname,
            "serial":     drive_serial,
            "model":      drive_model,
            "error_text": error_text,
        }
        _push_update(alert=alert)
        log.info("Burn-in finished", extra={"job_id": job_id, "devname": devname, "state": final_state})

        # Fire webhook + immediate email in background (non-blocking)
        try:
            from app import notifier
            cur2 = None
            async with _db() as db2:
                db2.row_factory = aiosqlite.Row
                cur2 = await db2.execute(
                    "SELECT profile, operator FROM burnin_jobs WHERE id=?", (job_id,)
                )
                job_row = await cur2.fetchone()
            if job_row:
                # Get bad_blocks count from surface_validate stage if present
                bad_blocks = 0
                async with _db() as db3:
                    cur3 = await db3.execute(
                        "SELECT bad_blocks FROM burnin_stages WHERE burnin_job_id=? AND stage_name='surface_validate'",
                        (job_id,)
                    )
                    bb_row = await cur3.fetchone()
                    if bb_row and bb_row[0]:
                        bad_blocks = bb_row[0]
                asyncio.create_task(notifier.notify_job_complete(
                    job_id=job_id,
                    devname=devname,
                    serial=drive_serial,
                    model=drive_model,
                    state=final_state,
                    profile=job_row["profile"],
                    operator=job_row["operator"],
                    error_text=error_text,
                    bad_blocks=bad_blocks,
                ))
        except Exception as exc:
            log.error("Failed to schedule notifications: %s", exc)


async def _execute_stages(job_id: int, stages: list[str], devname: str, drive_id: int) -> bool:
    for stage_name in stages:
        if await _is_cancelled(job_id):
            return False

        await _start_stage(job_id, stage_name)
        _push_update()

        try:
            ok = await _dispatch_stage(job_id, stage_name, devname, drive_id)
        except Exception as exc:
            log.error("Stage raised exception: %s", exc, extra={"job_id": job_id, "devname": devname, "stage": stage_name})
            ok = False
            await _finish_stage(job_id, stage_name, success=False, error_text=str(exc))
            _push_update()
            return False

        if not ok and await _is_cancelled(job_id):
            # Stage was aborted due to cancellation — mark it cancelled, not failed
            await _cancel_stage(job_id, stage_name)
        else:
            await _finish_stage(job_id, stage_name, success=ok)
        await _recalculate_progress(job_id)
        _push_update()

        if not ok:
            return False

    return True


async def _dispatch_stage(job_id: int, stage_name: str, devname: str, drive_id: int) -> bool:
    if stage_name == "precheck":
        return await _stage_precheck(job_id, drive_id)
    elif stage_name == "short_smart":
        return await _stage_smart_test(job_id, devname, "SHORT", "short_smart", drive_id)
    elif stage_name == "long_smart":
        return await _stage_smart_test(job_id, devname, "LONG", "long_smart", drive_id)
    elif stage_name == "surface_validate":
        return await _stage_surface_validate(job_id, devname, drive_id)
    elif stage_name == "io_validate":
        return await _stage_timed_simulate(job_id, "io_validate", settings.io_validate_seconds)
    elif stage_name == "final_check":
        return await _stage_final_check(job_id, devname, drive_id)
    return True


# ---------------------------------------------------------------------------
# Individual stage implementations
# ---------------------------------------------------------------------------

async def _stage_precheck(job_id: int, drive_id: int) -> bool:
    """Check SMART health and temperature before starting destructive work."""
    async with _db() as db:
        cur = await db.execute(
            "SELECT smart_health, temperature_c FROM drives WHERE id=?", (drive_id,)
        )
        row = await cur.fetchone()

    if not row:
        return False

    health, temp = row[0], row[1]

    if health == "FAILED":
        await _set_stage_error(job_id, "precheck", "Drive SMART health is FAILED — refusing to burn in")
        return False

    if temp and temp > settings.temp_crit_c:
        await _set_stage_error(job_id, "precheck", f"Drive temperature {temp}°C exceeds {settings.temp_crit_c}°C limit")
        return False

    await asyncio.sleep(1)  # Simulate brief check
    return True


async def _stage_smart_test(job_id: int, devname: str, test_type: str, stage_name: str,
                            drive_id: int | None = None) -> bool:
    """Start a SMART test. Uses SSH if configured, TrueNAS REST API otherwise."""
    from app import ssh_client
    if ssh_client.is_configured():
        return await _stage_smart_test_ssh(job_id, devname, test_type, stage_name, drive_id)
    return await _stage_smart_test_api(job_id, devname, test_type, stage_name)


async def _stage_smart_test_api(job_id: int, devname: str, test_type: str, stage_name: str) -> bool:
    """TrueNAS REST API path for SMART test (mock / dev mode)."""
    tn_job_id = await _client.start_smart_test([devname], test_type)

    while True:
        if await _is_cancelled(job_id):
            try:
                await _client.abort_job(tn_job_id)
            except Exception:
                pass
            return False

        jobs = await _client.get_smart_jobs()
        job = next((j for j in jobs if j["id"] == tn_job_id), None)

        if not job:
            return False

        state = job["state"]
        pct = job["progress"]["percent"]

        await _update_stage_percent(job_id, stage_name, pct)
        await _recalculate_progress(job_id, None)
        _push_update()

        if state == "SUCCESS":
            return True
        elif state in ("FAILED", "ABORTED"):
            await _set_stage_error(job_id, stage_name,
                                   job.get("error") or f"SMART {test_type} test failed")
            return False

        await asyncio.sleep(POLL_INTERVAL)


async def _stage_smart_test_ssh(job_id: int, devname: str, test_type: str, stage_name: str,
                                 drive_id: int | None) -> bool:
    """SSH path for SMART test — runs smartctl directly on TrueNAS."""
    from app import ssh_client

    # Start the test
    try:
        startup = await ssh_client.start_smart_test(devname, test_type)
        await _append_stage_log(job_id, stage_name, startup + "\n")
    except Exception as exc:
        await _set_stage_error(job_id, stage_name, f"Failed to start SMART test via SSH: {exc}")
        return False

    # Brief pause to let the test register in smartctl output
    await asyncio.sleep(3)

    # Poll until complete
    while True:
        if await _is_cancelled(job_id):
            try:
                await ssh_client.abort_smart_test(devname)
            except Exception:
                pass
            return False

        await asyncio.sleep(POLL_INTERVAL)

        try:
            progress = await ssh_client.poll_smart_progress(devname)
        except Exception as exc:
            log.warning("SSH SMART poll failed: %s", exc, extra={"job_id": job_id})
            await _append_stage_log(job_id, stage_name, f"[poll error] {exc}\n")
            continue

        await _append_stage_log(job_id, stage_name, progress["output"] + "\n---\n")

        if progress["state"] == "running":
            pct = max(0, 100 - progress["percent_remaining"])
            await _update_stage_percent(job_id, stage_name, pct)
            await _recalculate_progress(job_id)
            _push_update()

        elif progress["state"] == "passed":
            await _update_stage_percent(job_id, stage_name, 100)
            # Run attribute check
            if drive_id is not None:
                try:
                    attrs = await ssh_client.get_smart_attributes(devname)
                    await _store_smart_attrs(drive_id, attrs)
                    await _store_smart_raw_output(drive_id, test_type, attrs["raw_output"])
                    if attrs["failures"]:
                        error = "SMART attribute failures: " + "; ".join(attrs["failures"])
                        await _set_stage_error(job_id, stage_name, error)
                        return False
                    if attrs["warnings"]:
                        await _append_stage_log(
                            job_id, stage_name,
                            "[WARNING] " + "; ".join(attrs["warnings"]) + "\n"
                        )
                except Exception as exc:
                    log.warning("Failed to retrieve SMART attributes: %s", exc)
            await _recalculate_progress(job_id)
            _push_update()
            return True

        elif progress["state"] == "failed":
            await _set_stage_error(job_id, stage_name, f"SMART {test_type} test failed")
            return False
        # "unknown" → keep polling


async def _stage_surface_validate(job_id: int, devname: str, drive_id: int) -> bool:
    """
    Surface validation stage.
    SSH mode: runs badblocks -wsv -b 4096 -p 1 /dev/{devname}.
    Mock mode: simulated timed progress (no real I/O).
    """
    from app import ssh_client
    if ssh_client.is_configured():
        return await _stage_surface_validate_ssh(job_id, devname, drive_id)
    return await _stage_timed_simulate(job_id, "surface_validate", settings.surface_validate_seconds)


async def _stage_surface_validate_ssh(job_id: int, devname: str, drive_id: int) -> bool:
    """Run badblocks over SSH, streaming output to stage log."""
    from app import ssh_client

    await _append_stage_log(
        job_id, "surface_validate",
        f"[START] badblocks -wsv -b 4096 -p 1 /dev/{devname}\n"
        f"[NOTE]  This is a DESTRUCTIVE write test. All data on /dev/{devname} will be overwritten.\n\n"
    )

    def _is_cancelled_sync() -> bool:
        # Synchronous version — we check the DB state flag set by cancel_job()
        import asyncio
        loop = asyncio.get_event_loop()
        try:
            return loop.run_until_complete(_is_cancelled(job_id))
        except Exception:
            return False

    last_logged_pct = [-1]

    def on_progress(pct: int, bad_blocks: int, line: str) -> None:
        nonlocal last_logged_pct
        # Write to log (fire-and-forget via asyncio.create_task from sync context)
        # The log append is done in the async flush below
        pass

    accumulated_lines: list[str] = []

    async def on_progress_async(pct: int, bad_blocks: int, line: str) -> None:
        accumulated_lines.append(line)
        # Flush to DB and update progress every ~25 lines to avoid excessive DB writes
        if len(accumulated_lines) % 25 == 0:
            await _append_stage_log(job_id, "surface_validate", "".join(accumulated_lines[-25:]))
            await _update_stage_bad_blocks(job_id, "surface_validate", bad_blocks)
            await _update_stage_percent(job_id, "surface_validate", pct)
            await _recalculate_progress(job_id)
            _push_update()
        if await _is_cancelled(job_id):
            raise asyncio.CancelledError

    # Run badblocks — we adapt the callback pattern to async by collecting then flushing
    result = {"bad_blocks": 0, "output": "", "aborted": False}
    try:
        # The actual streaming; we handle progress via the accumulated_lines pattern
        bad_blocks_total = 0
        output_lines: list[str] = []

        async with await ssh_client._connect() as conn:
            cmd = f"badblocks -wsv -b 4096 -p 1 /dev/{devname}"
            async with conn.create_process(cmd) as proc:
                import re as _re

                async def _drain(stream, is_stderr: bool):
                    nonlocal bad_blocks_total
                    async for raw in stream:
                        line = raw if isinstance(raw, str) else raw.decode("utf-8", errors="replace")
                        output_lines.append(line)

                        if is_stderr:
                            m = _re.search(r"([\d.]+)%\s+done", line)
                            if m:
                                pct = min(99, int(float(m.group(1))))
                                await _update_stage_percent(job_id, "surface_validate", pct)
                                await _update_stage_bad_blocks(job_id, "surface_validate", bad_blocks_total)
                                await _recalculate_progress(job_id)
                                _push_update()
                        else:
                            stripped = line.strip()
                            if stripped and stripped.isdigit():
                                bad_blocks_total += 1

                        # Append to DB log in chunks
                        if len(output_lines) % 20 == 0:
                            chunk = "".join(output_lines[-20:])
                            await _append_stage_log(job_id, "surface_validate", chunk)

                        # Abort on bad block threshold
                        if bad_blocks_total > settings.bad_block_threshold:
                            proc.kill()
                            output_lines.append(
                                f"\n[ABORTED] {bad_blocks_total} bad block(s) exceeded "
                                f"threshold ({settings.bad_block_threshold})\n"
                            )
                            return

                        if await _is_cancelled(job_id):
                            proc.kill()
                            return

                await asyncio.gather(
                    _drain(proc.stdout, False),
                    _drain(proc.stderr, True),
                    return_exceptions=True,
                )
                await proc.wait()

        # Flush remaining output
        remainder = "".join(output_lines)
        await _append_stage_log(job_id, "surface_validate", remainder)
        result["bad_blocks"] = bad_blocks_total
        result["output"] = remainder
        result["aborted"] = bad_blocks_total > settings.bad_block_threshold

    except asyncio.CancelledError:
        return False
    except Exception as exc:
        await _append_stage_log(job_id, "surface_validate", f"\n[SSH error] {exc}\n")
        await _set_stage_error(job_id, "surface_validate", f"SSH badblocks error: {exc}")
        return False

    await _update_stage_bad_blocks(job_id, "surface_validate", result["bad_blocks"])

    if result["aborted"] or result["bad_blocks"] > settings.bad_block_threshold:
        await _set_stage_error(
            job_id, "surface_validate",
            f"Surface validate FAILED: {result['bad_blocks']} bad block(s) found "
            f"(threshold: {settings.bad_block_threshold})"
        )
        return False

    return True


async def _stage_timed_simulate(job_id: int, stage_name: str, duration_seconds: int) -> bool:
    """Simulate a timed stage with progress updates (mock / dev mode)."""
    start = time.monotonic()

    while True:
        if await _is_cancelled(job_id):
            return False

        elapsed = time.monotonic() - start
        pct = min(100, int(elapsed / duration_seconds * 100))

        await _update_stage_percent(job_id, stage_name, pct)
        await _recalculate_progress(job_id, None)
        _push_update()

        if pct >= 100:
            return True

        await asyncio.sleep(POLL_INTERVAL)


async def _stage_final_check(job_id: int, devname: str, drive_id: int | None = None) -> bool:
    """
    Verify drive passed all tests.
    SSH mode: run smartctl -a and check critical attributes.
    Mock mode: check SMART health field in DB.
    """
    await asyncio.sleep(1)
    from app import ssh_client
    if ssh_client.is_configured() and drive_id is not None:
        try:
            attrs = await ssh_client.get_smart_attributes(devname)
            await _store_smart_attrs(drive_id, attrs)
            if attrs["health"] == "FAILED" or attrs["failures"]:
                failures = attrs["failures"] or [f"SMART health: {attrs['health']}"]
                await _set_stage_error(job_id, "final_check",
                                       "Final check failed: " + "; ".join(failures))
                return False
            return True
        except Exception as exc:
            log.warning("SSH final_check failed, falling back to DB check: %s", exc)

    # DB check (mock mode fallback)
    async with _db() as db:
        cur = await db.execute(
            "SELECT smart_health FROM drives WHERE devname=?", (devname,)
        )
        row = await cur.fetchone()

    if not row or row[0] == "FAILED":
        await _set_stage_error(job_id, "final_check", "Drive SMART health is FAILED after burn-in")
        return False

    return True


# ---------------------------------------------------------------------------
# DB helpers
# ---------------------------------------------------------------------------

async def _is_cancelled(job_id: int) -> bool:
    async with _db() as db:
        cur = await db.execute("SELECT state FROM burnin_jobs WHERE id=?", (job_id,))
        row = await cur.fetchone()
        return bool(row and row[0] == "cancelled")


async def _start_stage(job_id: int, stage_name: str) -> None:
    async with _db() as db:
        await db.execute("PRAGMA journal_mode=WAL")
        await db.execute(
            "UPDATE burnin_stages SET state='running', started_at=? WHERE burnin_job_id=? AND stage_name=?",
            (_now(), job_id, stage_name),
        )
        await db.execute(
            "UPDATE burnin_jobs SET stage_name=? WHERE id=?",
            (stage_name, job_id),
        )
        await db.commit()


async def _finish_stage(job_id: int, stage_name: str, success: bool, error_text: str | None = None) -> None:
    now = _now()
    state = "passed" if success else "failed"
    async with _db() as db:
        await db.execute("PRAGMA journal_mode=WAL")
        cur = await db.execute(
            "SELECT started_at FROM burnin_stages WHERE burnin_job_id=? AND stage_name=?",
            (job_id, stage_name),
        )
        row = await cur.fetchone()
        duration = None
        if row and row[0]:
            try:
                start = datetime.fromisoformat(row[0])
                if start.tzinfo is None:
                    start = start.replace(tzinfo=timezone.utc)
                duration = (datetime.now(timezone.utc) - start).total_seconds()
            except Exception:
                pass

        # Only overwrite error_text if one is passed; otherwise preserve what the stage already wrote
        if error_text is not None:
            await db.execute(
                """UPDATE burnin_stages
                   SET state=?, percent=?, finished_at=?, duration_seconds=?, error_text=?
                   WHERE burnin_job_id=? AND stage_name=?""",
                (state, 100 if success else None, now, duration, error_text, job_id, stage_name),
            )
        else:
            await db.execute(
                """UPDATE burnin_stages
                   SET state=?, percent=?, finished_at=?, duration_seconds=?
                   WHERE burnin_job_id=? AND stage_name=?""",
                (state, 100 if success else None, now, duration, job_id, stage_name),
            )
        await db.commit()


async def _update_stage_percent(job_id: int, stage_name: str, pct: int) -> None:
    async with _db() as db:
        await db.execute("PRAGMA journal_mode=WAL")
        await db.execute(
            "UPDATE burnin_stages SET percent=? WHERE burnin_job_id=? AND stage_name=?",
            (pct, job_id, stage_name),
        )
        await db.commit()


async def _cancel_stage(job_id: int, stage_name: str) -> None:
    now = _now()
    async with _db() as db:
        await db.execute("PRAGMA journal_mode=WAL")
        await db.execute(
            "UPDATE burnin_stages SET state='cancelled', finished_at=? WHERE burnin_job_id=? AND stage_name=?",
            (now, job_id, stage_name),
        )
        await db.commit()


async def _append_stage_log(job_id: int, stage_name: str, text: str) -> None:
    """Append text to the log_text column of a burnin_stages row."""
    async with _db() as db:
        await db.execute("PRAGMA journal_mode=WAL")
        await db.execute(
            """UPDATE burnin_stages
               SET log_text = COALESCE(log_text, '') || ?
               WHERE burnin_job_id=? AND stage_name=?""",
            (text, job_id, stage_name),
        )
        await db.commit()


async def _update_stage_bad_blocks(job_id: int, stage_name: str, count: int) -> None:
    async with _db() as db:
        await db.execute("PRAGMA journal_mode=WAL")
        await db.execute(
            "UPDATE burnin_stages SET bad_blocks=? WHERE burnin_job_id=? AND stage_name=?",
            (count, job_id, stage_name),
        )
        await db.commit()


async def _store_smart_attrs(drive_id: int, attrs: dict) -> None:
    """Persist latest SMART attribute dict to drives.smart_attrs (JSON)."""
    import json
    # Convert int keys to str for JSON serialisation
    serialisable = {str(k): v for k, v in attrs.get("attributes", {}).items()}
    blob = json.dumps({
        "health":   attrs.get("health", "UNKNOWN"),
        "attrs":    serialisable,
        "warnings": attrs.get("warnings", []),
        "failures": attrs.get("failures", []),
    })
    async with _db() as db:
        await db.execute("PRAGMA journal_mode=WAL")
        await db.execute("UPDATE drives SET smart_attrs=? WHERE id=?", (blob, drive_id))
        await db.commit()


async def _store_smart_raw_output(drive_id: int, test_type: str, raw: str) -> None:
    """Store raw smartctl output in smart_tests.raw_output."""
    async with _db() as db:
        await db.execute("PRAGMA journal_mode=WAL")
        await db.execute(
            "UPDATE smart_tests SET raw_output=? WHERE drive_id=? AND test_type=?",
            (raw, drive_id, test_type.lower()),
        )
        await db.commit()


async def _set_stage_error(job_id: int, stage_name: str, error_text: str) -> None:
    async with _db() as db:
        await db.execute("PRAGMA journal_mode=WAL")
        await db.execute(
            "UPDATE burnin_stages SET error_text=? WHERE burnin_job_id=? AND stage_name=?",
            (error_text, job_id, stage_name),
        )
        await db.commit()


async def _recalculate_progress(job_id: int, profile: str | None = None) -> None:
    """Recompute overall job % from actual stage rows. profile param is unused (kept for compat)."""
    async with _db() as db:
        db.row_factory = aiosqlite.Row
        await db.execute("PRAGMA journal_mode=WAL")

        cur = await db.execute(
            "SELECT stage_name, state, percent FROM burnin_stages WHERE burnin_job_id=? ORDER BY id",
            (job_id,),
        )
        stages = await cur.fetchall()
        if not stages:
            return

        total_weight = sum(_STAGE_BASE_WEIGHTS.get(s["stage_name"], 5) for s in stages)
        if total_weight == 0:
            return

        completed = 0.0
        current = None
        for s in stages:
            w  = _STAGE_BASE_WEIGHTS.get(s["stage_name"], 5)
            st = s["state"]
            if st == "passed":
                completed += w
            elif st == "running":
                completed += w * (s["percent"] or 0) / 100
                current = s["stage_name"]

        pct = int(completed / total_weight * 100)
        await db.execute(
            "UPDATE burnin_jobs SET percent=?, stage_name=? WHERE id=?",
            (pct, current, job_id),
        )
        await db.commit()


# ---------------------------------------------------------------------------
# SSE push
# ---------------------------------------------------------------------------

def _push_update(alert: dict | None = None) -> None:
    """Notify SSE subscribers that data has changed, with optional browser notification payload."""
    try:
        from app import poller
        poller._notify_subscribers(alert=alert)
    except Exception:
        pass


# ---------------------------------------------------------------------------
# Stuck-job detection (called by poller every ~5 cycles)
# ---------------------------------------------------------------------------

async def check_stuck_jobs() -> None:
    """Mark jobs that have been 'running' beyond stuck_job_hours as 'unknown'."""
    threshold_seconds = settings.stuck_job_hours * 3600

    async with _db() as db:
        db.row_factory = aiosqlite.Row
        await db.execute("PRAGMA journal_mode=WAL")

        cur = await db.execute("""
            SELECT bj.id, bj.drive_id, d.devname, bj.started_at
            FROM burnin_jobs bj
            JOIN drives d ON d.id = bj.drive_id
            WHERE bj.state = 'running'
              AND bj.started_at IS NOT NULL
              AND (julianday('now') - julianday(bj.started_at)) * 86400 > ?
        """, (threshold_seconds,))
        stuck = await cur.fetchall()

        if not stuck:
            return

        now = _now()
        for row in stuck:
            job_id, drive_id, devname, started_at = row[0], row[1], row[2], row[3]
            log.critical(
                "Stuck burn-in detected — marking unknown",
                extra={"job_id": job_id, "devname": devname, "started_at": started_at},
            )
            await db.execute(
                "UPDATE burnin_jobs SET state='unknown', finished_at=? WHERE id=?",
                (now, job_id),
            )
            await db.execute(
                """INSERT INTO audit_events (event_type, drive_id, burnin_job_id, operator, message)
                   VALUES (?,?,?,?,?)""",
                ("burnin_stuck", drive_id, job_id, "system",
                 f"Job stuck for >{settings.stuck_job_hours}h — automatically marked unknown"),
            )

        await db.commit()

    _push_update()
    log.warning("Marked %d stuck job(s) as unknown", len(stuck))