"""
Auto-Save Utilities

Provides decorators and context managers for automatic session saving
after long-running operations like job submissions.
"""

import functools
import threading
import time
from typing import Callable, Optional, Any, Dict
from datetime import datetime, timedelta

from session_integration import SessionIntegration


class AutoSaveManager:
    """
    Manages periodic auto-saving of session state.
    """
    
    def __init__(
        self,
        session_integration: SessionIntegration,
        trame_state: Any,
        interval_seconds: int = 30
    ):
        """
        Initialize auto-save manager.
        
        Args:
            session_integration: SessionIntegration instance
            trame_state: Trame server state
            interval_seconds: Interval between auto-saves
        """
        self.session_integration = session_integration
        self.trame_state = trame_state
        self.interval = interval_seconds
        self.thread: Optional[threading.Thread] = None
        self.running = False
        self.last_save = datetime.utcnow()
    
    def start(self) -> None:
        """Start the auto-save thread."""
        if self.running:
            return
        
        self.running = True
        self.thread = threading.Thread(target=self._auto_save_loop, daemon=True)
        self.thread.name = "SessionAutoSaveThread"
        self.thread.start()
    
    def stop(self) -> None:
        """Stop the auto-save thread."""
        self.running = False
        if self.thread:
            self.thread.join(timeout=5)
    
    def _auto_save_loop(self) -> None:
        """Main loop for auto-save thread."""
        while self.running:
            try:
                time.sleep(self.interval)
                if self.session_integration.auto_save_enabled:
                    self.session_integration._capture_trame_state(self.trame_state)
                    self.session_integration.save_current_session()
                    self.last_save = datetime.utcnow()
            except Exception as e:
                print(f"Auto-save error: {e}")
    
    def manual_save(self) -> bool:
        """Manually trigger a save."""
        if not self.session_integration.auto_save_enabled:
            return False
        
        self.session_integration._capture_trame_state(self.trame_state)
        result = self.session_integration.save_current_session()
        if result:
            self.last_save = datetime.utcnow()
        return result


def auto_save_after_operation(
    session_integration: SessionIntegration,
    trame_state: Any
) -> Callable:
    """
    Decorator that automatically saves session after a function completes.
    
    Usage:
        @auto_save_after_operation(session_integration, state)
        def run_long_job():
            # Do work
            pass
    """
    def decorator(func: Callable) -> Callable:
        @functools.wraps(func)
        def wrapper(*args, **kwargs):
            try:
                result = func(*args, **kwargs)
            finally:
                if session_integration.auto_save_enabled:
                    session_integration._capture_trame_state(trame_state)
                    session_integration.save_current_session()
            return result
        return wrapper
    return decorator


def save_on_job_submit(
    session_integration: SessionIntegration,
    trame_state: Any,
    job_id_key: str = "job_id",
    service_type: str = "unknown"
) -> Callable:
    """
    Decorator that tracks job submission and saves session.
    
    Usage:
        @save_on_job_submit(session_integration, state, job_id_key="job_id", service_type="qiskit_ibm")
        def submit_to_ibm():
            job_id = "..."
            return job_id
    """
    def decorator(func: Callable) -> Callable:
        @functools.wraps(func)
        def wrapper(*args, **kwargs):
            result = func(*args, **kwargs)
            
            # Extract job ID from result
            job_id = None
            if isinstance(result, str):
                job_id = result
            elif isinstance(result, dict) and job_id_key in result:
                job_id = result[job_id_key]
            
            # Track job in session
            if job_id:
                session_integration.add_job(job_id, service_type)
                print(f"Job {job_id} tracked in session {session_integration.current_session_id}")
            
            # Save session
            if session_integration.auto_save_enabled:
                session_integration._capture_trame_state(trame_state)
                session_integration.save_current_session()
            
            return result
        return wrapper
    return decorator


class JobProgressTracker:
    """
    Tracks progress of long-running jobs and periodically saves session.
    """
    
    def __init__(
        self,
        session_integration: SessionIntegration,
        trame_state: Any,
        job_id: str,
        service_type: str = "unknown",
        save_interval: int = 10
    ):
        """
        Initialize job progress tracker.
        
        Args:
            session_integration: SessionIntegration instance
            trame_state: Trame server state
            job_id: Job ID to track
            service_type: Service type (e.g., "qiskit_ibm")
            save_interval: Seconds between progress saves
        """
        self.session_integration = session_integration
        self.trame_state = trame_state
        self.job_id = job_id
        self.service_type = service_type
        self.save_interval = save_interval
        self.last_save = datetime.utcnow()
        
        # Register job in session
        session_integration.add_job(job_id, service_type)
    
    def update_progress(self, progress: float, status: str = "running") -> None:
        """
        Update job progress.
        
        Args:
            progress: Progress 0.0-1.0
            status: Job status string
        """
        # Check if it's time to save
        now = datetime.utcnow()
        if now - self.last_save > timedelta(seconds=self.save_interval):
            if self.session_integration.auto_save_enabled:
                self.session_integration.update_job_status(self.job_id, status)
                self.session_integration._capture_trame_state(self.trame_state)
                self.session_integration.save_current_session()
                self.last_save = now
    
    def complete(self, result: Optional[Dict[str, Any]] = None) -> None:
        """
        Mark job as complete.
        
        Args:
            result: Optional result data
        """
        self.session_integration.update_job_status(
            self.job_id,
            "completed",
            result
        )
        self.session_integration._capture_trame_state(self.trame_state)
        self.session_integration.save_current_session()
    
    def fail(self, error: str = "Unknown error") -> None:
        """
        Mark job as failed.
        
        Args:
            error: Error message
        """
        self.session_integration.update_job_status(
            self.job_id,
            "failed",
            {"error": error}
        )
        self.session_integration._capture_trame_state(self.trame_state)
        self.session_integration.save_current_session()