"""Schedules and one sensor.

EVERY SCHEDULE SHIPS STOPPED (`DefaultScheduleStatus.STOPPED`).

That is the whole point on an 8GB development machine: defining a schedule
should cost nothing until someone decides they want it. A schedule that starts
running the moment `dagster dev` is launched would have the daemon waking up,
importing sentence-transformers and hitting Postgres on a laptop that is also
running the API, the frontend, Ollama and Postgres itself. Start them from the
Dagster UI when you want them; the definitions are here so that turning one on
is a click rather than a code change.

The cadences are staggered so two heavy jobs never overlap.
"""
# NOTE: deliberately no `from __future__ import annotations` here.
# Dagster resolves the decorated function signatures at definition time to
# validate the `context` parameter and to infer asset input types. Under
# PEP 563/649 the annotations arrive as strings and that validation fails
# with "Cannot annotate `context` parameter with type AssetExecutionContext".
# Local Python is 3.14, which defers annotations by default, so this is not
# hypothetical.

from dagster import (
    DefaultScheduleStatus,
    DefaultSensorStatus,
    RunRequest,
    ScheduleDefinition,
    SensorEvaluationContext,
    SkipReason,
    sensor,
)

from orchestration.jobs import (
    catalog_ingestion_job,
    embedding_refresh_job,
    ml_training_job,
    nutrition_enrichment_job,
)
from orchestration.partitions import active_brand_names

# 02:00 - catalog first, so everything downstream sees fresh rows.
daily_catalog_refresh = ScheduleDefinition(
    name="daily_catalog_refresh",
    job=catalog_ingestion_job,
    cron_schedule="0 2 * * *",
    default_status=DefaultScheduleStatus.STOPPED,
    description="Re-run seed intake, validation, enrichment and storage nightly.",
)

# 03:00 - after ingestion has had an hour, embed whatever arrived.
daily_embedding_refresh = ScheduleDefinition(
    name="daily_embedding_refresh",
    job=embedding_refresh_job,
    cron_schedule="0 3 * * *",
    default_status=DefaultScheduleStatus.STOPPED,
    description="Embed rows stored since the last run and verify the index.",
)

# 04:00 - the slowest job, and the only one that leaves the machine.
daily_nutrition_refresh = ScheduleDefinition(
    name="daily_nutrition_refresh",
    job=nutrition_enrichment_job,
    cron_schedule="0 4 * * *",
    default_status=DefaultScheduleStatus.STOPPED,
    description="Fetch nutrition for products that still lack it, then refit.",
)

# Weekly, not daily: the training data is a deterministic simulation, so a
# nightly refit would spend CPU reproducing almost exactly the same models.
weekly_ml_retrain = ScheduleDefinition(
    name="weekly_ml_retrain",
    job=ml_training_job,
    cron_schedule="0 5 * * 0",
    default_status=DefaultScheduleStatus.STOPPED,
    description="Sunday 05:00 - rebuild the store dataset and refit the served models.",
)

ALL_SCHEDULES = [
    daily_catalog_refresh,
    daily_embedding_refresh,
    daily_nutrition_refresh,
    weekly_ml_retrain,
]


@sensor(
    job=catalog_ingestion_job,
    minimum_interval_seconds=60,
    default_status=DefaultSensorStatus.STOPPED,
    description="Re-ingest a brand when its seed catalog file changes on disk.",
)
def seed_catalog_sensor(context: SensorEvaluationContext):
    """Watch seed-file mtimes; request a run for the brands that changed.

    Kept as simple as it can be on purpose - a stat() of a handful of files
    once a minute. No file-watcher process, no message broker, no inotify. The
    brief asked for lightweight event handling and this is the cheapest thing
    that actually works; anything more would be infrastructure to maintain for
    a directory that changes a few times a day at most.

    The cursor is the newest mtime seen. On first evaluation it records the
    current state and requests nothing, so enabling the sensor does not
    immediately trigger a full rebuild of every brand.
    """
    from app.services.brand_registry import resolve_parent_brand
    from app.services.brand_sync import SEED_DIR, seed_catalog_paths

    if not SEED_DIR.exists():
        return SkipReason("Seed directory {} does not exist.".format(SEED_DIR))

    partitions = {name: resolve_parent_brand(name) for name in active_brand_names()}
    if not partitions:
        return SkipReason("No active brands to watch.")

    previous = float(context.cursor) if context.cursor else None
    newest = previous or 0.0
    changed = set()

    # Only the active directory: an archived catalog belongs to a brand the app
    # is not serving, so a change to one is not an event worth acting on.
    for path in seed_catalog_paths(SEED_DIR):
        if path.parent != SEED_DIR:
            continue
        try:
            mtime = path.stat().st_mtime
        except OSError:
            continue
        newest = max(newest, mtime)
        if previous is None or mtime <= previous:
            continue
        for name, parent in partitions.items():
            if parent.split()[0].lower() in path.name.lower() or name.lower() in path.name.lower():
                changed.add(name)

    context.update_cursor(str(newest))

    if previous is None:
        return SkipReason(
            "First evaluation - recorded the current file state without "
            "triggering a rebuild."
        )
    if not changed:
        return SkipReason("No active seed catalog changed since the last check.")

    context.log.info("Seed files changed for: %s", ", ".join(sorted(changed)))
    return [
        RunRequest(run_key="{}-{}".format(brand, newest), partition_key=brand)
        for brand in sorted(changed)
    ]


ALL_SENSORS = [seed_catalog_sensor]