import os
from datetime import datetime
from threading import Event, Thread

import psutil
import pytz

from core.cleanup import CLEANUP_TIMER
from core.config import SERVER_OWNER_CALLSIGN
from core.constants import SOFTWARE_VERSION
from core.data_providers import DATA_PROVIDERS
from core.data_store import DATA_STORE
from core.prometheus_metrics_handler import alerts_gauge, memory_use_gauge, spots_gauge
from telnetserver.telnetserver import TELNET_SERVER
from webserver.webserver import WEB_SERVER


class StatusReporter:
    """Provides a timed update of the application's status data."""

    def __init__(self, run_interval):
        """Constructor"""

        self._run_interval = run_interval
        self._thread = None
        self._stop_event = Event()
        self._startup_time = datetime.now(pytz.UTC)

        DATA_STORE.status.get()["software_version"] = SOFTWARE_VERSION
        DATA_STORE.status.get()["server_owner_callsign"] = SERVER_OWNER_CALLSIGN
        DATA_STORE.status.store()

    def start(self):
        """Start the reporter thread"""

        self._thread = Thread(target=self._run, name="StatusReporter")
        self._thread.start()

    def stop(self):
        """Stop any threads and prepare for application shutdown"""

        self._stop_event.set()

    def _run(self):
        """Thread entry point: report immediately on startup, then on each interval until stopped"""

        while True:
            self._report()
            if self._stop_event.wait(timeout=self._run_interval):
                break

    def _report(self):
        """Write status information"""

        DATA_STORE.status.get()["uptime"] = (datetime.now(pytz.UTC) - self._startup_time).total_seconds()
        DATA_STORE.status.get()["mem_use_mb"] = round(psutil.Process(os.getpid()).memory_info().rss / (1024 * 1024), 3)
        DATA_STORE.status.get()["num_spots"] = len(DATA_STORE.spots.values())
        DATA_STORE.status.get()["num_alerts"] = len(DATA_STORE.alerts.values())
        DATA_STORE.status.get()["spot_providers"] = [
            {
                "name": p.name,
                "enabled": p.enabled,
                "enabled_by_default_in_web_ui": p.enabled_by_default_in_web_ui,
                "status": p.status,
                "last_updated": p.last_update_time.replace(tzinfo=pytz.UTC).timestamp()
                if p.last_update_time.year > 2000
                else 0,
                "last_spot": p.last_spot_time.replace(tzinfo=pytz.UTC).timestamp()
                if p.last_spot_time.year > 2000
                else 0,
            }
            for p in DATA_PROVIDERS.spot_providers
        ]
        DATA_STORE.status.get()["alert_providers"] = [
            {
                "name": p.name,
                "enabled": p.enabled,
                "status": p.status,
                "last_updated": p.last_update_time.replace(tzinfo=pytz.UTC).timestamp()
                if p.last_update_time.year > 2000
                else 0,
            }
            for p in DATA_PROVIDERS.alert_providers
        ]
        DATA_STORE.status.get()["solar_condition_providers"] = [
            {
                "name": p.name,
                "enabled": p.enabled,
                "status": p.status,
                "last_updated": p.last_update_time.replace(tzinfo=pytz.UTC).timestamp()
                if p.last_update_time.year > 2000
                else 0,
            }
            for p in DATA_PROVIDERS.solar_condition_providers
        ]
        DATA_STORE.status.get()["static_data_providers"] = [
            {
                "name": p.name,
                "enabled": p.enabled,
                "status": p.status,
                "last_updated": p.last_update_time.replace(tzinfo=pytz.UTC).timestamp()
                if p.last_update_time.year > 2000
                else 0,
            }
            for p in DATA_PROVIDERS.static_data_providers
        ]
        DATA_STORE.status.get()["sig_ref_data_providers"] = [
            {
                "sig_name": p.sig_name,
                "enabled": p.enabled,
                "status": p.status,
                "last_updated": p.last_update_time.replace(tzinfo=pytz.UTC).timestamp()
                if p.last_update_time.year > 2000
                else 0,
                "reference_count": p.reference_count,
            }
            for p in DATA_PROVIDERS.sig_ref_data_providers
        ]
        DATA_STORE.status.get()["callsign_data_providers"] = [
            {
                "name": p.name,
                "enabled": p.enabled,
                "status": p.status,
                "last_updated": p.last_update_time.replace(tzinfo=pytz.UTC).timestamp()
                if p.last_update_time.year > 2000
                else 0,
                "lookup_count": p.lookup_count,
            }
            for p in DATA_PROVIDERS.callsign_data_providers
        ]
        DATA_STORE.status.get()["cleanup"] = {
            "status": CLEANUP_TIMER.status,
            "last_ran": CLEANUP_TIMER.last_cleanup_time.replace(tzinfo=pytz.UTC).timestamp()
            if CLEANUP_TIMER.last_cleanup_time
            else 0,
        }
        DATA_STORE.status.get()["webserver"] = {
            "status": WEB_SERVER.web_server_metrics.status,
            "api_requests_per_hour": WEB_SERVER.web_server_metrics.api_requests_per_hour(),
            "page_requests_per_hour": WEB_SERVER.web_server_metrics.page_requests_per_hour(),
            "sse_client_count": WEB_SERVER.sse_client_count,
        }
        DATA_STORE.status.get()["telnet"] = {
            "client_count": TELNET_SERVER.client_count,
        }
        DATA_STORE.status.store()

        # Update Prometheus metrics
        memory_use_gauge.set(psutil.Process(os.getpid()).memory_info().rss)
        spots_gauge.set(len(DATA_STORE.spots.values()))
        alerts_gauge.set(len(DATA_STORE.alerts.values()))