"""Celery app configuration and task setup."""

import logging

from celery import Celery
from kombu import Exchange, Queue
from src.config import settings

logger = logging.getLogger(__name__)

# Create Celery app
app = Celery(settings.app_name)

# Configure from settings
app.conf.update(
    broker_url=settings.celery.broker_url,
    result_backend=settings.celery.result_backend,
    task_serializer=settings.celery.task_serializer,
    result_serializer=settings.celery.result_serializer,
    accept_content=settings.celery.accept_content,
    timezone=settings.celery.timezone,
    enable_utc=settings.celery.enable_utc,
    task_track_started=settings.celery.task_track_started,
    task_time_limit=settings.celery.task_time_limit,
    task_soft_time_limit=settings.celery.task_soft_time_limit,
)

# Define queues with routing
default_exchange = Exchange("tasks", type="direct")

app.conf.task_queues = (
    Queue("critical", exchange=default_exchange, routing_key="tasks.critical", priority=10),
    Queue("high", exchange=default_exchange, routing_key="tasks.high", priority=7),
    Queue("default", exchange=default_exchange, routing_key="tasks.default", priority=5),
    Queue("low", exchange=default_exchange, routing_key="tasks.low", priority=1),
    Queue("webhooks", exchange=default_exchange, routing_key="webhooks", priority=8),
    Queue("polling", exchange=default_exchange, routing_key="polling", priority=3),
)

# Default queue
app.conf.task_default_queue = "default"
app.conf.task_default_exchange_type = "direct"
app.conf.task_default_routing_key = "tasks.default"

# Task routing
app.conf.task_routes = {
    "tasks.ingest.*": {"queue": "critical", "routing_key": "tasks.critical"},
    "tasks.webhooks.*": {"queue": "webhooks", "routing_key": "webhooks"},
    "tasks.polling.*": {"queue": "polling", "routing_key": "polling"},
    "tasks.enrichment.*": {"queue": "high", "routing_key": "tasks.high"},
}


@app.on_after_finalize.connect
def setup_periodic_tasks(sender, **kwargs):
    """Register periodic tasks with beat scheduler."""

    # Slack polling every 15 minutes
    sender.add_periodic_task(
        settings.sync.slack_poll_interval,
        sync_slack_incremental.s(),
        name="sync-slack-incremental",
    )

    # GitHub polling every 1 hour
    sender.add_periodic_task(
        settings.sync.github_poll_interval,
        sync_github_incremental.s(),
        name="sync-github-incremental",
    )

    # Jira polling every 1 hour
    sender.add_periodic_task(
        settings.sync.jira_poll_interval,
        sync_jira_incremental.s(),
        name="sync-jira-incremental",
    )

    # Log polling every 5 minutes
    sender.add_periodic_task(
        settings.sync.logs_poll_interval,
        poll_server_logs.s(),
        name="poll-server-logs",
    )

    # Metrics polling every 15 minutes
    sender.add_periodic_task(
        settings.sync.metrics_poll_interval,
        poll_metrics_anomalies.s(),
        name="poll-metrics-anomalies",
    )

    # Error traces polling every 10 minutes
    sender.add_periodic_task(
        settings.sync.error_traces_poll_interval,
        poll_error_traces.s(),
        name="poll-error-traces",
    )

    # Staleness scoring daily at 03:00 UTC
    from celery.schedules import crontab
    sender.add_periodic_task(
        crontab(hour=3, minute=0),
        compute_staleness_scores.s(),
        name="compute-staleness-scores",
    )

    # Dependency risk daily at 03:30 UTC
    sender.add_periodic_task(
        crontab(hour=3, minute=30),
        compute_dependency_risk.s(),
        name="compute-dependency-risk",
    )


# Task imports (to be implemented in tasks module)
from celery import shared_task


@shared_task(queue="polling", bind=True, max_retries=3)
def sync_slack_incremental(self):
    """Sync new messages from Slack channels incrementally."""
    pass


@shared_task(queue="polling", bind=True, max_retries=3)
def sync_github_incremental(self):
    """Sync new events from GitHub incrementally."""
    pass


@shared_task(queue="polling", bind=True, max_retries=3)
def sync_jira_incremental(self):
    """Sync new issues from Jira incrementally."""
    pass


@shared_task(queue="polling", bind=True, max_retries=3)
def poll_server_logs(self):
    """Poll and ingest ERROR/WARN logs from monitored services."""
    pass


@shared_task(queue="polling", bind=True, max_retries=3)
def poll_metrics_anomalies(self):
    """Z-score spike detection and escalation trend detection — runs every 15 min."""
    try:
        from src.anomaly.tasks import run_zscore_anomaly_detection
        run_zscore_anomaly_detection()
    except Exception as exc:
        logger.error("poll_metrics_anomalies failed: %s", exc)
        raise self.retry(exc=exc, countdown=120)


@shared_task(queue="polling", bind=True, max_retries=3)
def poll_error_traces(self):
    """Poll error traces from APM services."""
    pass


@shared_task(queue="critical", bind=True, max_retries=5)
def process_webhook_event(self, source_type: str, event_data: dict, rbac_tags: dict):
    """Route webhook event to appropriate agent for real-time ingestion."""
    pass


@shared_task(queue="high", bind=True, max_retries=3)
def enrich_and_index_document(self, document: dict):
    """Extract entities, relationships, and index document."""
    pass


@shared_task(queue="low", bind=True, max_retries=2)
def compute_staleness_scores(self):
    """Daily staleness risk scoring for all documents (03:00 UTC)."""
    try:
        from src.anomaly.tasks import run_staleness_scoring
        run_staleness_scoring()
    except Exception as exc:
        logger.error("compute_staleness_scores failed: %s", exc)
        raise self.retry(exc=exc, countdown=300)


@shared_task(queue="low", bind=True, max_retries=2)
def compute_dependency_risk(self):
    """Daily dependency risk modelling from Neo4j graph (03:30 UTC)."""
    try:
        from src.anomaly.tasks import run_dependency_risk_modeling
        run_dependency_risk_modeling()
    except Exception as exc:
        logger.error("compute_dependency_risk failed: %s", exc)
        raise self.retry(exc=exc, countdown=300)


if __name__ == "__main__":
    app.start()