# -*- coding: utf-8 -*-
"""
Scheduler - Hauptklasse für Job-Scheduling.
"""

import asyncio
import json
import os
from dataclasses import dataclass, field
from datetime import datetime, timedelta
from pathlib import Path
from typing import Any, Callable, TYPE_CHECKING

from trixy_core.scheduler.job import ScheduledJob, JobConfig, JobState, JobResult
from trixy_core.scheduler.trigger.base import Trigger, TriggerContext
from trixy_core.scheduler.trigger.cron import CronTrigger
from trixy_core.scheduler.trigger.interval import IntervalTrigger
from trixy_core.scheduler.trigger.datetime_trigger import DateTimeTrigger
from trixy_core.scheduler.trigger.event import EventTrigger
from trixy_core.scheduler.trigger.composite import AndTrigger, OrTrigger
from trixy_core.scheduler.condition.base import Condition
from trixy_core.scheduler.condition.time import (
    TimeRangeCondition, DayOfWeekCondition, DateRangeCondition,
)
from trixy_core.scheduler.condition.activity import (
    RecentActivityCondition, ActivityCountCondition,
)
from trixy_core.scheduler.condition.sensor import (
    ComparisonOperator, SensorThresholdCondition, SensorChangeCondition,
)
from trixy_core.scheduler.condition.state import (
    StateCondition, BooleanCondition, ExistsCondition,
)
from trixy_core.scheduler.condition.composite import (
    AndCondition, OrCondition, NotCondition, XorCondition,
)
from trixy_core.scheduler.condition.script import (
    ScriptCondition, AsyncScriptCondition,
)
from trixy_core.scheduler.condition.file_value import (
    JsonValueCondition, IniValueCondition, YamlValueCondition,
    TomlValueCondition, EnvFileValueCondition,
)
from trixy_core.scheduler.condition.expression import (
    ExpressionCondition, LambdaCondition,
)
from trixy_core.scheduler.action.base import Action, ActionResult
from trixy_core.scheduler.action.event import EmitEventAction, MultiEventAction
from trixy_core.scheduler.action.callback import CallbackAction, MethodAction
from trixy_core.scheduler.action.command import CommandAction, ScriptAction
from trixy_core.scheduler.action.tts import TTSSpeakAction

if TYPE_CHECKING:
    from trixy_core.events import EventManager


@dataclass
class SchedulerConfig:
    """Konfiguration für den Scheduler."""

    # Intervalle
    tick_interval_seconds: float = 1.0      # Prüfintervall
    cleanup_interval_seconds: float = 3600  # History-Cleanup

    # Job-Persistierung
    jobs_directory: str = "./cron"          # Verzeichnis für Job-Dateien
    auto_load: bool = True                  # Jobs beim Start laden
    auto_save: bool = True                  # Jobs bei Änderungen speichern

    # Limits
    max_concurrent_jobs: int = 10           # Maximale parallele Jobs
    max_history_per_job: int = 100          # History-Einträge pro Job

    # Defaults für Jobs
    default_timeout_seconds: float = 60.0
    default_max_retries: int = 3

    # Event-Integration
    emit_job_events: bool = True            # Events bei Job-Ausführung emittieren


class Scheduler:
    """
    Scheduler für Job-Ausführung.

    Lädt und speichert Jobs als JSON-Dateien in ./cron/*.json.
    """

    # Trigger-Registry für Deserialisierung
    TRIGGER_TYPES: dict[str, type] = {
        "CronTrigger": CronTrigger,
        "IntervalTrigger": IntervalTrigger,
        "DateTimeTrigger": DateTimeTrigger,
        "EventTrigger": EventTrigger,
        "AndTrigger": AndTrigger,
        "OrTrigger": OrTrigger,
    }

    # Condition-Registry für Deserialisierung
    CONDITION_TYPES: dict[str, type] = {
        "TimeRangeCondition": TimeRangeCondition,
        "DayOfWeekCondition": DayOfWeekCondition,
        "DateRangeCondition": DateRangeCondition,
        "RecentActivityCondition": RecentActivityCondition,
        "ActivityCountCondition": ActivityCountCondition,
        "SensorThresholdCondition": SensorThresholdCondition,
        "SensorChangeCondition": SensorChangeCondition,
        "StateCondition": StateCondition,
        "BooleanCondition": BooleanCondition,
        "ExistsCondition": ExistsCondition,
        "AndCondition": AndCondition,
        "OrCondition": OrCondition,
        "NotCondition": NotCondition,
        "XorCondition": XorCondition,
        # Script
        "ScriptCondition": ScriptCondition,
        "AsyncScriptCondition": AsyncScriptCondition,
        # File Value
        "JsonValueCondition": JsonValueCondition,
        "IniValueCondition": IniValueCondition,
        "YamlValueCondition": YamlValueCondition,
        "TomlValueCondition": TomlValueCondition,
        "EnvFileValueCondition": EnvFileValueCondition,
        # Expression
        "ExpressionCondition": ExpressionCondition,
        # LambdaCondition kann nicht aus JSON geladen werden
    }

    # Action-Registry für Deserialisierung
    ACTION_TYPES: dict[str, type] = {
        "EmitEventAction": EmitEventAction,
        "MultiEventAction": MultiEventAction,
        "CommandAction": CommandAction,
        "ScriptAction": ScriptAction,
        "TTSSpeakAction": TTSSpeakAction,
        # CallbackAction und MethodAction können nicht aus JSON geladen werden
    }

    def __init__(
        self,
        config: SchedulerConfig | None = None,
        event_manager: "EventManager | None" = None,
    ):
        """
        Initialisiert den Scheduler.

        Args:
            config: Scheduler-Konfiguration
            event_manager: EventManager für Events
        """
        self._config = config or SchedulerConfig()
        self._event_manager = event_manager

        # Jobs
        self._jobs: dict[str, ScheduledJob] = {}
        self._running_jobs: set[str] = set()

        # Zustand
        self._running = False
        self._task: asyncio.Task | None = None
        self._context: dict[str, Any] = {}

        # Callbacks
        self._job_callbacks: list[Callable[[ScheduledJob, JobResult], None]] = []

        # Verzeichnis erstellen
        self._ensure_directory()

    def _ensure_directory(self) -> None:
        """Stellt sicher, dass das Jobs-Verzeichnis existiert."""
        jobs_dir = Path(self._config.jobs_directory)
        jobs_dir.mkdir(parents=True, exist_ok=True)

    @property
    def config(self) -> SchedulerConfig:
        """Scheduler-Konfiguration."""
        return self._config

    @property
    def is_running(self) -> bool:
        """Prüft ob Scheduler läuft."""
        return self._running

    @property
    def jobs(self) -> dict[str, ScheduledJob]:
        """Alle Jobs."""
        return dict(self._jobs)

    @property
    def job_count(self) -> int:
        """Anzahl Jobs."""
        return len(self._jobs)

    @property
    def running_jobs(self) -> set[str]:
        """Aktuell laufende Jobs."""
        return self._running_jobs.copy()

    @property
    def context(self) -> dict[str, Any]:
        """Aktueller Kontext."""
        return dict(self._context)

    # === Context Management ===

    def set_context(self, key: str, value: Any) -> None:
        """Setzt Kontext-Variable."""
        self._context[key] = value

    def update_context(self, data: dict[str, Any]) -> None:
        """Aktualisiert Kontext."""
        self._context.update(data)

    def clear_context(self) -> None:
        """Löscht Kontext."""
        self._context.clear()

    # === Job Management ===

    def add_job(
        self,
        job: ScheduledJob,
        save: bool | None = None,
    ) -> str:
        """
        Fügt Job hinzu.

        Args:
            job: ScheduledJob
            save: Als JSON speichern (default: auto_save)

        Returns:
            Job-ID
        """
        self._jobs[job.job_id] = job

        # Speichern
        if save is None:
            save = self._config.auto_save

        if save:
            self._save_job(job)

        return job.job_id

    def create_job(
        self,
        trigger: Trigger,
        actions: list[Action] | Action,
        conditions: list[Condition] | None = None,
        config: JobConfig | None = None,
        job_id: str | None = None,
        save: bool | None = None,
    ) -> ScheduledJob:
        """
        Erstellt und fügt Job hinzu.

        Args:
            trigger: Trigger für den Job
            actions: Action(s) für den Job
            conditions: Optionale Conditions
            config: Job-Konfiguration
            job_id: Job-ID (wird generiert wenn None)
            save: Als JSON speichern

        Returns:
            ScheduledJob
        """
        if isinstance(actions, Action):
            actions = [actions]

        job = ScheduledJob(
            job_id=job_id,
            trigger=trigger,
            conditions=conditions,
            actions=actions,
            config=config,
        )

        self.add_job(job, save=save)
        return job

    def get_job(self, job_id: str) -> ScheduledJob | None:
        """Holt Job nach ID."""
        return self._jobs.get(job_id)

    def remove_job(
        self,
        job_id: str,
        delete_file: bool = True,
    ) -> bool:
        """
        Entfernt Job.

        Args:
            job_id: Job-ID
            delete_file: JSON-Datei löschen

        Returns:
            True wenn entfernt
        """
        if job_id not in self._jobs:
            return False

        del self._jobs[job_id]

        if delete_file:
            self._delete_job_file(job_id)

        return True

    def enable_job(self, job_id: str) -> bool:
        """Aktiviert Job."""
        job = self._jobs.get(job_id)
        if job:
            job.enable()
            if self._config.auto_save:
                self._save_job(job)
            return True
        return False

    def disable_job(self, job_id: str) -> bool:
        """Deaktiviert Job."""
        job = self._jobs.get(job_id)
        if job:
            job.disable()
            if self._config.auto_save:
                self._save_job(job)
            return True
        return False

    # === Callbacks ===

    def on_job_executed(
        self,
        callback: Callable[[ScheduledJob, JobResult], None],
    ) -> None:
        """Registriert Callback für Job-Ausführung."""
        self._job_callbacks.append(callback)

    # === Persistence ===

    def _get_job_path(self, job_id: str) -> Path:
        """Gibt Pfad zur Job-Datei zurück."""
        # Dateiname: job_id.json (Sonderzeichen ersetzen)
        safe_id = "".join(c if c.isalnum() or c in "-_" else "_" for c in job_id)
        return Path(self._config.jobs_directory) / f"{safe_id}.json"

    def _save_job(self, job: ScheduledJob) -> bool:
        """
        Speichert Job als JSON-Datei.

        Args:
            job: Zu speichernder Job

        Returns:
            True wenn erfolgreich
        """
        try:
            path = self._get_job_path(job.job_id)
            data = job.to_dict()

            with open(path, "w", encoding="utf-8") as f:
                json.dump(data, f, indent=2, ensure_ascii=False)

            return True
        except Exception as e:
            from trixy_core.utils.debug import perror
            perror(f"Fehler beim Speichern von Job {job.job_id}: {e}")
            return False

    def _delete_job_file(self, job_id: str) -> bool:
        """Löscht Job-Datei."""
        try:
            path = self._get_job_path(job_id)
            if path.exists():
                path.unlink()
            return True
        except Exception:
            return False

    def _load_job_from_dict(self, data: dict) -> ScheduledJob | None:
        """
        Lädt Job aus Dictionary.

        Args:
            data: Job-Daten

        Returns:
            ScheduledJob oder None bei Fehler
        """
        try:
            # Trigger laden
            trigger = None
            if data.get("trigger"):
                trigger = self._load_trigger(data["trigger"])

            # Conditions laden
            conditions = []
            for cond_data in data.get("conditions", []):
                condition = self._load_condition(cond_data)
                if condition:
                    conditions.append(condition)

            # Actions laden
            actions = []
            for action_data in data.get("actions", []):
                action = self._load_action(action_data)
                if action:
                    actions.append(action)

            # Config laden
            config_data = data.get("config", {})
            config = JobConfig(
                name=data.get("name", ""),
                description=data.get("description", ""),
                max_runs=config_data.get("max_runs", 0),
                max_failures=config_data.get("max_failures", 3),
                timeout_seconds=config_data.get("timeout_seconds", 60.0),
                priority=config_data.get("priority", 0),
                tags=config_data.get("tags", []),
                enabled=data.get("enabled", True),
            )

            # Job erstellen
            job = ScheduledJob(
                job_id=data.get("job_id"),
                trigger=trigger,
                conditions=conditions,
                actions=actions,
                config=config,
            )

            return job

        except Exception as e:
            from trixy_core.utils.debug import perror
            perror(f"Fehler beim Laden von Job: {e}")
            return None

    def _load_trigger(self, data: dict) -> Trigger | None:
        """Lädt Trigger aus Dictionary."""
        trigger_type = data.get("type")
        trigger_class = self.TRIGGER_TYPES.get(trigger_type)

        if not trigger_class:
            return None

        if hasattr(trigger_class, "from_dict"):
            return trigger_class.from_dict(data)

        return None

    def _load_condition(self, data: dict) -> Condition | None:
        """Lädt Condition aus Dictionary."""
        cond_type = data.get("type")
        cond_class = self.CONDITION_TYPES.get(cond_type)

        if not cond_class:
            return None

        if hasattr(cond_class, "from_dict"):
            return cond_class.from_dict(data)

        return None

    def _load_action(self, data: dict) -> Action | None:
        """Lädt Action aus Dictionary."""
        action_type = data.get("type")
        action_class = self.ACTION_TYPES.get(action_type)

        if not action_class:
            return None

        if hasattr(action_class, "from_dict"):
            return action_class.from_dict(data)

        return None

    def load_jobs(self) -> int:
        """
        Lädt alle Jobs aus dem Jobs-Verzeichnis.

        Returns:
            Anzahl geladener Jobs
        """
        jobs_dir = Path(self._config.jobs_directory)
        loaded = 0

        if not jobs_dir.exists():
            return 0

        for file_path in jobs_dir.glob("*.json"):
            try:
                with open(file_path, "r", encoding="utf-8") as f:
                    data = json.load(f)

                job = self._load_job_from_dict(data)
                if job:
                    self._jobs[job.job_id] = job
                    loaded += 1

            except Exception as e:
                from trixy_core.utils.debug import perror
                perror(f"Fehler beim Laden von {file_path}: {e}")

        return loaded

    def save_all_jobs(self) -> int:
        """
        Speichert alle Jobs.

        Returns:
            Anzahl gespeicherter Jobs
        """
        saved = 0
        for job in self._jobs.values():
            if self._save_job(job):
                saved += 1
        return saved

    # === Execution ===

    async def start(self) -> None:
        """Startet den Scheduler."""
        if self._running:
            return

        # Jobs laden
        if self._config.auto_load:
            loaded = self.load_jobs()
            from trixy_core.utils.debug import pinfo
            pinfo(f"Scheduler: {loaded} Jobs geladen")

        self._running = True
        self._task = asyncio.create_task(self._run_loop())

    async def stop(self) -> None:
        """Stoppt den Scheduler."""
        self._running = False

        if self._task:
            self._task.cancel()
            try:
                await self._task
            except asyncio.CancelledError:
                pass
            self._task = None

        # Laufende Jobs abwarten
        while self._running_jobs:
            await asyncio.sleep(0.1)

    async def _run_loop(self) -> None:
        """Hauptschleife des Schedulers."""
        while self._running:
            try:
                await self._tick()
            except Exception as e:
                from trixy_core.utils.debug import perror
                perror(f"Scheduler-Fehler: {e}")

            await asyncio.sleep(self._config.tick_interval_seconds)

    async def _tick(self) -> None:
        """Ein Tick des Schedulers."""
        now = datetime.now()

        # Jobs prüfen
        for job in list(self._jobs.values()):
            if not job.is_runnable:
                continue

            if job.job_id in self._running_jobs:
                continue

            # Max concurrent prüfen
            if len(self._running_jobs) >= self._config.max_concurrent_jobs:
                break

            # Trigger prüfen — last_fire_time aus dem Trigger selbst uebergeben
            trigger = job.trigger
            if not trigger:
                continue

            context = TriggerContext(
                current_time=now,
                last_fire_time=trigger.last_fire_time,
            )

            if trigger.should_fire(context):
                # Conditions prüfen
                if job.should_run_now(self._context):
                    asyncio.create_task(self._execute_job(job))

    async def _execute_job(self, job: ScheduledJob) -> None:
        """Führt einen Job aus."""
        self._running_jobs.add(job.job_id)
        start_time = datetime.now()

        try:
            # Job-Status setzen
            job._state = JobState.RUNNING

            # Event emittieren
            if self._config.emit_job_events and self._event_manager:
                await self._event_manager.emit("scheduler_job_started", {
                    "job_id": job.job_id,
                    "job_name": job.name,
                })

            # Kontext für Actions
            action_context = {
                **self._context,
                "job_id": job.job_id,
                "job_name": job.name,
                "event_manager": self._event_manager,
                "current_time": start_time,
            }

            # Actions ausführen
            results = []
            error = None

            for action in job.actions:
                if not action.is_enabled:
                    continue

                try:
                    result = await action.execute(action_context)
                    results.append(result)

                    if not result.success:
                        error = result.error
                        break

                except Exception as e:
                    error = str(e)
                    break

            # Trigger markieren
            if job.trigger:
                job.trigger.fire()

            # Job-Ergebnis
            end_time = datetime.now()
            job_result = JobResult(
                job_id=job.job_id,
                success=error is None,
                start_time=start_time,
                end_time=end_time,
                result=results,
                error=error,
                condition_results=job.check_conditions(self._context),
            )

            # Job aktualisieren
            job.record_run(job_result)

            # Speichern
            if self._config.auto_save:
                self._save_job(job)

            # Callbacks
            for callback in self._job_callbacks:
                try:
                    callback(job, job_result)
                except Exception:
                    pass

            # Event emittieren
            if self._config.emit_job_events and self._event_manager:
                await self._event_manager.emit("scheduler_job_completed", {
                    "job_id": job.job_id,
                    "job_name": job.name,
                    "success": job_result.success,
                    "duration_ms": job_result.duration_ms,
                    "error": error,
                })

        except Exception as e:
            from trixy_core.utils.debug import perror
            perror(f"Fehler bei Job {job.job_id}: {e}")

            job._state = JobState.FAILED

        finally:
            self._running_jobs.discard(job.job_id)

    # === Event Handling ===

    async def on_event(self, event_name: str, event_data: dict | None = None) -> None:
        """
        Wird aufgerufen wenn ein Event eintrifft.

        Für Jobs mit EventTrigger.
        """
        context = TriggerContext(
            current_time=datetime.now(),
            event_name=event_name,
            event_data=event_data,
        )

        for job in list(self._jobs.values()):
            if not job.is_runnable:
                continue

            if job.job_id in self._running_jobs:
                continue

            # Nur EventTrigger oder Composite mit EventTrigger
            trigger = job.trigger
            if not trigger:
                continue

            if isinstance(trigger, EventTrigger):
                if trigger.on_event(event_name, event_data):
                    if job.should_run_now(self._context):
                        asyncio.create_task(self._execute_job(job))

    # === Statistics ===

    def get_statistics(self) -> dict:
        """Gibt Scheduler-Statistiken zurück."""
        enabled = sum(1 for j in self._jobs.values() if j.is_enabled)
        total_runs = sum(j.run_count for j in self._jobs.values())
        total_failures = sum(j.failure_count for j in self._jobs.values())

        return {
            "total_jobs": len(self._jobs),
            "enabled_jobs": enabled,
            "running_jobs": len(self._running_jobs),
            "total_runs": total_runs,
            "total_failures": total_failures,
            "is_running": self._running,
        }