from collections.abc import Callable
from datetime import date
from socket import gethostname
from typing import Any

from fastapi import FastAPI

from app.core.config import get_settings
from app.core.constants import ActorValue
from app.modules.feishu.constants import FeishuReceiveIdType
from app.application.delivery import ReportDeliveryService
from app.modules.observability.constants import HeartbeatComponent


def attach_scheduler(app: FastAPI) -> None:
    """Attach optional APScheduler jobs to the FastAPI application."""

    settings = get_settings()
    if not settings.scheduler_enabled:
        return

    scheduler = create_scheduler(app)

    @app.on_event("startup")
    def start_scheduler() -> None:
        scheduler.start()

    @app.on_event("shutdown")
    def stop_scheduler() -> None:
        scheduler.shutdown(wait=False)


def create_scheduler(app: FastAPI | None = None) -> Any:
    """Create the V2/V3 scheduler without requiring a FastAPI process."""

    from apscheduler.schedulers.background import BackgroundScheduler

    from app.core.database import SessionLocal
    from app.core.background.task_queue import (
        enqueue_attendance_summary_push,
        enqueue_daily_brief_push,
        enqueue_event_dispatch,
        enqueue_legacy_project_sync,
        enqueue_legacy_task_sync,
        enqueue_lifecycle_report,
        enqueue_market_report,
        enqueue_project_weekly_push,
        enqueue_risk_progress_push,
        enqueue_subscription_cycle,
        enqueue_work_daily_push,
        enqueue_work_weekly_push,
    )
    from app.modules.observability.service import ObservabilityService
    from app.modules.personalization.services import ConversationService
    from app.modules.reports.services import ReportService

    settings = get_settings()
    scheduler = BackgroundScheduler(
        timezone="Asia/Shanghai",
        job_defaults={
            "coalesce": True,
            "max_instances": 1,
            "misfire_grace_time": 300,
        },
    )

    def deliver_report(
        state_key: str,
        build_report: Callable[[Any], dict[str, Any]],
        enqueue_push: Callable[..., dict[str, Any]],
    ) -> None:
        db = SessionLocal()
        try:
            service = ReportService(db)
            report = build_report(service)
            _set_state(app, state_key, report)
            if not _feishu_delivery_configured(settings):
                return
            if settings.task_queue_enabled:
                dispatch = enqueue_push(
                    receive_id=settings.feishu_default_chat_id,
                    receive_id_type=FeishuReceiveIdType.CHAT_ID,
                    actor=ActorValue.SCHEDULER,
                )
                _set_state(app, f"{state_key}_dispatch", dispatch)
                return
            ReportDeliveryService(db).push_report(
                report,
                receive_id=settings.feishu_default_chat_id,
                receive_id_type=FeishuReceiveIdType.CHAT_ID,
                actor=ActorValue.SCHEDULER,
            )
        finally:
            db.close()

    def run_daily_brief() -> None:
        deliver_report(
            "last_daily_brief",
            lambda service: service.daily_brief(),
            enqueue_daily_brief_push,
        )

    def run_project_weekly() -> None:
        deliver_report(
            "last_project_weekly",
            lambda service: service.project_weekly(),
            enqueue_project_weekly_push,
        )

    def run_attendance_summary() -> None:
        deliver_report(
            "last_attendance_summary",
            lambda service: service.attendance_summary(),
            enqueue_attendance_summary_push,
        )

    def run_risk_progress() -> None:
        deliver_report(
            "last_risk_progress",
            lambda service: service.risk_progress(),
            enqueue_risk_progress_push,
        )

    def run_work_daily() -> None:
        deliver_report(
            "last_work_daily",
            lambda service: service.work_daily_report(
                reporter=ActorValue.SCHEDULER,
                actor=ActorValue.SCHEDULER,
            ),
            enqueue_work_daily_push,
        )

    def run_work_weekly() -> None:
        deliver_report(
            "last_work_weekly",
            lambda service: service.work_weekly_report(
                reporter=ActorValue.SCHEDULER,
                actor=ActorValue.SCHEDULER,
            ),
            enqueue_work_weekly_push,
        )

    def run_legacy_project_sync() -> None:
        dispatch = enqueue_legacy_project_sync(actor=ActorValue.SCHEDULER)
        _set_state(app, "last_legacy_project_sync_dispatch", dispatch)

    def run_legacy_task_sync() -> None:
        dispatch = enqueue_legacy_task_sync(actor=ActorValue.SCHEDULER)
        _set_state(app, "last_legacy_task_sync_dispatch", dispatch)

    def run_daily_lifecycle() -> None:
        dispatch = enqueue_lifecycle_report(
            report_type="daily",
            receive_id=settings.feishu_default_chat_id,
            receive_id_type=FeishuReceiveIdType.CHAT_ID,
            actor=ActorValue.SCHEDULER,
        )
        _set_state(app, "last_daily_lifecycle_dispatch", dispatch)

    def run_weekly_lifecycle() -> None:
        dispatch = enqueue_lifecycle_report(
            report_type="weekly",
            receive_id=settings.feishu_default_chat_id,
            receive_id_type=FeishuReceiveIdType.CHAT_ID,
            actor=ActorValue.SCHEDULER,
        )
        _set_state(app, "last_weekly_lifecycle_dispatch", dispatch)

    def run_market_premarket() -> None:
        dispatch = enqueue_market_report("premarket")
        _set_state(app, "last_market_premarket_dispatch", dispatch)

    def run_market_close() -> None:
        dispatch = enqueue_market_report("close")
        _set_state(app, "last_market_close_dispatch", dispatch)

    def run_market_weekly() -> None:
        dispatch = enqueue_market_report("weekly", date.today())
        _set_state(app, "last_market_weekly_dispatch", dispatch)

    def run_event_dispatch() -> None:
        dispatch = enqueue_event_dispatch(
            limit=settings.event_dispatch_batch_size,
            actor=ActorValue.SCHEDULER,
        )
        _set_state(app, "last_event_dispatch", dispatch)

    def record_scheduler_heartbeat() -> None:
        db = SessionLocal()
        try:
            heartbeat = ObservabilityService(db).record_heartbeat(
                component=HeartbeatComponent.SCHEDULER,
                instance_id=gethostname(),
                actor=ActorValue.SCHEDULER,
            )
            _set_state(app, "last_scheduler_heartbeat", heartbeat)
        finally:
            db.close()

    def run_subscription_cycle() -> None:
        dispatch = enqueue_subscription_cycle(actor=ActorValue.SCHEDULER)
        _set_state(app, "last_subscription_cycle", dispatch)

    def run_personalization_retention_cleanup() -> None:
        db = SessionLocal()
        try:
            deleted = ConversationService(db).cleanup_expired_globally()
            _set_state(app, "last_personalization_retention_cleanup", deleted)
        finally:
            db.close()

    if settings.lifecycle_pipeline_enabled:
        scheduler.add_job(
            run_daily_lifecycle,
            trigger="cron",
            hour=settings.daily_brief_cron_hour,
            minute=settings.daily_brief_cron_minute,
            id="daily_lifecycle_pipeline",
            replace_existing=True,
        )
        scheduler.add_job(
            run_weekly_lifecycle,
            trigger="cron",
            day_of_week=settings.weekly_project_report_day_of_week,
            hour=settings.weekly_project_report_cron_hour,
            minute=settings.weekly_project_report_cron_minute,
            id="weekly_lifecycle_pipeline",
            replace_existing=True,
        )
    else:
        scheduler.add_job(
            run_daily_brief,
            trigger="cron",
            hour=settings.daily_brief_cron_hour,
            minute=settings.daily_brief_cron_minute,
            id="daily_brief_push",
            replace_existing=True,
        )
        scheduler.add_job(
            run_project_weekly,
            trigger="cron",
            day_of_week=settings.weekly_project_report_day_of_week,
            hour=settings.weekly_project_report_cron_hour,
            minute=settings.weekly_project_report_cron_minute,
            id="project_weekly_push",
            replace_existing=True,
        )
    scheduler.add_job(
        run_attendance_summary,
        trigger="cron",
        hour=settings.attendance_summary_cron_hour,
        minute=settings.attendance_summary_cron_minute,
        id="attendance_summary_push",
        replace_existing=True,
    )
    scheduler.add_job(
        run_risk_progress,
        trigger="cron",
        hour=settings.risk_progress_cron_hour,
        minute=settings.risk_progress_cron_minute,
        id="risk_progress_push",
        replace_existing=True,
    )
    scheduler.add_job(
        run_work_daily,
        trigger="cron",
        hour=settings.work_daily_cron_hour,
        minute=settings.work_daily_cron_minute,
        id="work_daily_push",
        replace_existing=True,
    )
    scheduler.add_job(
        run_work_weekly,
        trigger="cron",
        day_of_week=settings.work_weekly_report_day_of_week,
        hour=settings.work_weekly_cron_hour,
        minute=settings.work_weekly_cron_minute,
        id="work_weekly_push",
        replace_existing=True,
    )
    if settings.event_dispatch_enabled:
        scheduler.add_job(
            run_event_dispatch,
            trigger="cron",
            minute=settings.event_dispatch_cron_minute,
            id="event_dispatch",
            replace_existing=True,
        )
    if settings.market_analysis_enabled:
        scheduler.add_job(
            run_market_premarket,
            trigger="cron",
            day_of_week="mon-fri",
            hour=settings.market_premarket_cron_hour,
            minute=settings.market_premarket_cron_minute,
            id="market_premarket_analysis",
            replace_existing=True,
        )
        scheduler.add_job(
            run_market_close,
            trigger="cron",
            day_of_week="mon-fri",
            hour=settings.market_close_cron_hour,
            minute=settings.market_close_cron_minute,
            id="market_close_analysis",
            replace_existing=True,
        )
        scheduler.add_job(
            run_market_weekly,
            trigger="cron",
            day_of_week=settings.market_weekly_day_of_week,
            hour=settings.market_weekly_cron_hour,
            minute=settings.market_weekly_cron_minute,
            id="market_weekly_analysis",
            replace_existing=True,
        )
    scheduler.add_job(
        record_scheduler_heartbeat,
        trigger="interval",
        seconds=settings.heartbeat_interval_seconds,
        id="scheduler_heartbeat",
        replace_existing=True,
    )
    if settings.feishu_user_features_enabled:
        scheduler.add_job(
            run_subscription_cycle,
            trigger="interval",
            minutes=1,
            id="subscription_delivery_cycle",
            replace_existing=True,
        )
        scheduler.add_job(
            run_personalization_retention_cleanup,
            trigger="interval",
            minutes=1,
            id="personalization_retention_cleanup",
            replace_existing=True,
        )
    if (
        not settings.lifecycle_pipeline_enabled
        and settings.legacy_sync_enabled
        and settings.legacy_project_query
    ):
        scheduler.add_job(
            run_legacy_project_sync,
            trigger="cron",
            hour=settings.legacy_project_sync_cron_hour,
            minute=settings.legacy_project_sync_cron_minute,
            id="legacy_project_sync",
            replace_existing=True,
        )
    if (
        not settings.lifecycle_pipeline_enabled
        and settings.legacy_sync_enabled
        and settings.legacy_task_query
    ):
        scheduler.add_job(
            run_legacy_task_sync,
            trigger="cron",
            hour=settings.legacy_task_sync_cron_hour,
            minute=settings.legacy_task_sync_cron_minute,
            id="legacy_task_sync",
            replace_existing=True,
        )
    return scheduler


def _set_state(app: FastAPI | None, key: str, value: Any) -> None:
    if app is not None:
        setattr(app.state, key, value)


def _feishu_delivery_configured(settings: Any) -> bool:
    return bool(
        settings.feishu_app_id
        and settings.feishu_app_secret
        and settings.feishu_default_chat_id
    )