"""
Context Engineering Integration for OptimizationRunner

Provides integration between the context engineering system and the
OptimizationRunner without modifying the core runner code.

Two approaches are provided:
1. ContextEngineeringMixin - Mix into OptimizationRunner subclass
2. ContextAwareRunner - Wrapper that adds context engineering

Usage:
    # Approach 1: Mixin
    class MyRunner(ContextEngineeringMixin, OptimizationRunner):
        pass

    # Approach 2: Wrapper
    runner = OptimizationRunner(...)
    context_runner = ContextAwareRunner(runner, playbook_path)
    context_runner.run(...)
"""

from typing import Dict, Any, Optional, List, Callable
from pathlib import Path
from datetime import datetime
import time

from .playbook import AtomizerPlaybook, get_playbook
from .reflector import AtomizerReflector, OptimizationOutcome
from .feedback_loop import FeedbackLoop
from .compaction import CompactionManager, EventType
from .session_state import AtomizerSessionState, TaskType, get_session


class ContextEngineeringMixin:
    """
    Mixin class to add context engineering to OptimizationRunner.

    Provides:
    - Automatic playbook loading/saving
    - Trial outcome reflection
    - Learning from successes/failures
    - Session state tracking

    Usage:
        class MyContextAwareRunner(ContextEngineeringMixin, OptimizationRunner):
            def __init__(self, *args, **kwargs):
                super().__init__(*args, **kwargs)
                self.init_context_engineering()
    """

    def init_context_engineering(
        self,
        playbook_path: Optional[Path] = None,
        enable_compaction: bool = True,
        compaction_threshold: int = 50
    ) -> None:
        """
        Initialize context engineering components.

        Call this in your subclass __init__ after super().__init__().

        Args:
            playbook_path: Path to playbook JSON (default: output_dir/playbook.json)
            enable_compaction: Whether to enable context compaction
            compaction_threshold: Number of events before compaction
        """
        # Determine playbook path
        if playbook_path is None:
            playbook_path = getattr(self, 'output_dir', Path('.')) / 'playbook.json'

        self._playbook_path = Path(playbook_path)
        self._playbook = AtomizerPlaybook.load(self._playbook_path)
        self._reflector = AtomizerReflector(self._playbook)
        self._feedback_loop = FeedbackLoop(self._playbook_path)

        # Initialize compaction if enabled
        self._enable_compaction = enable_compaction
        if enable_compaction:
            self._compaction_manager = CompactionManager(
                compaction_threshold=compaction_threshold,
                keep_recent=20,
                keep_errors=True
            )
        else:
            self._compaction_manager = None

        # Session state
        self._session = get_session()
        self._session.exposed.task_type = TaskType.RUN_OPTIMIZATION

        # Track active playbook items for feedback attribution
        self._active_playbook_items: List[str] = []

        # Statistics
        self._context_stats = {
            "trials_processed": 0,
            "insights_generated": 0,
            "errors_captured": 0
        }

    def get_relevant_playbook_items(self, max_items: int = 15) -> List[str]:
        """
        Get relevant playbook items for current optimization context.

        Returns:
            List of playbook item context strings
        """
        context = self._playbook.get_context_for_task(
            task_type="optimization",
            max_items=max_items,
            min_confidence=0.5
        )

        # Extract item IDs for feedback tracking
        self._active_playbook_items = [
            item.id for item in self._playbook.items.values()
        ][:max_items]

        return context.split('\n')

    def record_trial_start(self, trial_number: int, design_vars: Dict[str, float]) -> None:
        """
        Record the start of a trial for context tracking.

        Args:
            trial_number: Trial number
            design_vars: Design variable values
        """
        if self._compaction_manager:
            self._compaction_manager.add_event(
                self._compaction_manager.events.__class__(
                    timestamp=datetime.now(),
                    event_type=EventType.TRIAL_START,
                    summary=f"Trial {trial_number} started",
                    details={"trial_number": trial_number, "design_vars": design_vars}
                )
            )

        self._session.add_action(f"Started trial {trial_number}")

    def record_trial_outcome(
        self,
        trial_number: int,
        success: bool,
        objective_value: Optional[float],
        design_vars: Dict[str, float],
        errors: Optional[List[str]] = None,
        duration_seconds: float = 0.0
    ) -> Dict[str, Any]:
        """
        Record the outcome of a trial for learning.

        Args:
            trial_number: Trial number
            success: Whether trial succeeded
            objective_value: Objective value (None if failed)
            design_vars: Design variable values
            errors: List of error messages
            duration_seconds: Trial duration

        Returns:
            Dictionary with processing results
        """
        errors = errors or []

        # Update compaction manager
        if self._compaction_manager:
            self._compaction_manager.add_trial_event(
                trial_number=trial_number,
                success=success,
                objective=objective_value,
                duration=duration_seconds
            )

        # Create outcome for reflection
        outcome = OptimizationOutcome(
            trial_number=trial_number,
            success=success,
            objective_value=objective_value,
            constraint_violations=[],
            solver_errors=errors,
            design_variables=design_vars,
            extractor_used=getattr(self, '_current_extractor', ''),
            duration_seconds=duration_seconds
        )

        # Analyze and generate insights
        insights = self._reflector.analyze_trial(outcome)

        # Process through feedback loop
        result = self._feedback_loop.process_trial_result(
            trial_number=trial_number,
            success=success,
            objective_value=objective_value or 0.0,
            design_variables=design_vars,
            context_items_used=self._active_playbook_items,
            errors=errors
        )

        # Update statistics
        self._context_stats["trials_processed"] += 1
        self._context_stats["insights_generated"] += len(insights)

        # Update session state
        if success:
            self._session.add_action(
                f"Trial {trial_number} succeeded: obj={objective_value:.4g}"
            )
        else:
            error_summary = errors[0][:50] if errors else "unknown"
            self._session.add_error(f"Trial {trial_number}: {error_summary}")
            self._context_stats["errors_captured"] += 1

        return {
            "insights_extracted": len(insights),
            "playbook_items_updated": result.get("items_updated", 0)
        }

    def record_error(self, error_message: str, error_type: str = "") -> None:
        """
        Record an error for learning (outside trial context).

        Args:
            error_message: Error description
            error_type: Error classification
        """
        if self._compaction_manager:
            self._compaction_manager.add_error_event(error_message, error_type)

        self._session.add_error(error_message, error_type)
        self._context_stats["errors_captured"] += 1

    def finalize_context_engineering(self, study_stats: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
        """
        Finalize context engineering at end of optimization.

        Commits insights and saves playbook.

        Args:
            study_stats: Optional study statistics for analysis

        Returns:
            Dictionary with finalization results
        """
        if study_stats is None:
            study_stats = {
                "name": getattr(self, 'study', {}).get('study_name', 'unknown'),
                "total_trials": self._context_stats["trials_processed"],
                "best_value": getattr(self, 'best_value', 0),
                "convergence_rate": 0.8  # Would need actual calculation
            }

        # Finalize feedback loop
        result = self._feedback_loop.finalize_study(study_stats)

        # Save playbook
        self._playbook.save(self._playbook_path)

        # Add compaction stats
        if self._compaction_manager:
            result["compaction_stats"] = self._compaction_manager.get_stats()

        result["context_stats"] = self._context_stats

        return result

    def get_context_string(self) -> str:
        """
        Get full context string for LLM consumption.

        Returns:
            Formatted context string
        """
        parts = []

        # Session state
        parts.append(self._session.get_llm_context())

        # Playbook items
        playbook_context = self._playbook.get_context_for_task(
            task_type="optimization",
            max_items=15
        )
        if playbook_context:
            parts.append(playbook_context)

        # Compaction history
        if self._compaction_manager:
            parts.append(self._compaction_manager.get_context_string())

        return "\n\n---\n\n".join(parts)


class ContextAwareRunner:
    """
    Wrapper that adds context engineering to any OptimizationRunner.

    This approach doesn't require subclassing - it wraps an existing
    runner instance and intercepts relevant calls.

    Usage:
        runner = OptimizationRunner(...)
        context_runner = ContextAwareRunner(runner)

        # Use context_runner.run() instead of runner.run()
        study = context_runner.run(n_trials=50)

        # Get learning report
        report = context_runner.get_learning_report()
    """

    def __init__(
        self,
        runner,
        playbook_path: Optional[Path] = None,
        enable_compaction: bool = True
    ):
        """
        Initialize context-aware wrapper.

        Args:
            runner: OptimizationRunner instance to wrap
            playbook_path: Path to playbook (default: runner's output_dir)
            enable_compaction: Whether to enable context compaction
        """
        self._runner = runner

        # Determine playbook path
        if playbook_path is None:
            playbook_path = runner.output_dir / 'playbook.json'

        self._playbook_path = Path(playbook_path)
        self._playbook = AtomizerPlaybook.load(self._playbook_path)
        self._reflector = AtomizerReflector(self._playbook)
        self._feedback_loop = FeedbackLoop(self._playbook_path)

        # Compaction
        self._enable_compaction = enable_compaction
        if enable_compaction:
            self._compaction = CompactionManager(
                compaction_threshold=50,
                keep_recent=20
            )
        else:
            self._compaction = None

        # Session
        self._session = get_session()
        self._session.exposed.task_type = TaskType.RUN_OPTIMIZATION

        # Statistics
        self._stats = {
            "trials_observed": 0,
            "successful_trials": 0,
            "failed_trials": 0,
            "insights_generated": 0
        }

        # Hook into runner's objective function
        self._original_objective = runner._objective_function
        runner._objective_function = self._wrapped_objective

    def _wrapped_objective(self, trial) -> float:
        """
        Wrapped objective function that captures outcomes.
        """
        start_time = time.time()
        trial_number = trial.number

        # Record trial start
        if self._compaction:
            from .compaction import ContextEvent
            self._compaction.add_event(ContextEvent(
                timestamp=datetime.now(),
                event_type=EventType.TRIAL_START,
                summary=f"Trial {trial_number} starting"
            ))

        try:
            # Run original objective
            result = self._original_objective(trial)

            # Record success
            duration = time.time() - start_time
            self._record_success(trial_number, result, trial.params, duration)

            return result

        except Exception as e:
            # Record failure
            duration = time.time() - start_time
            self._record_failure(trial_number, str(e), trial.params, duration)
            raise

    def _record_success(
        self,
        trial_number: int,
        objective_value: float,
        params: Dict[str, Any],
        duration: float
    ) -> None:
        """Record successful trial."""
        self._stats["trials_observed"] += 1
        self._stats["successful_trials"] += 1

        if self._compaction:
            self._compaction.add_trial_event(
                trial_number=trial_number,
                success=True,
                objective=objective_value,
                duration=duration
            )

        # Process through feedback loop
        self._feedback_loop.process_trial_result(
            trial_number=trial_number,
            success=True,
            objective_value=objective_value,
            design_variables=dict(params),
            context_items_used=list(self._playbook.items.keys())[:10]
        )

        # Update session
        self._session.add_action(f"Trial {trial_number}: obj={objective_value:.4g}")

    def _record_failure(
        self,
        trial_number: int,
        error: str,
        params: Dict[str, Any],
        duration: float
    ) -> None:
        """Record failed trial."""
        self._stats["trials_observed"] += 1
        self._stats["failed_trials"] += 1

        if self._compaction:
            self._compaction.add_trial_event(
                trial_number=trial_number,
                success=False,
                duration=duration
            )
            self._compaction.add_error_event(error, "trial_failure")

        # Process through feedback loop
        self._feedback_loop.process_trial_result(
            trial_number=trial_number,
            success=False,
            objective_value=0.0,
            design_variables=dict(params),
            errors=[error]
        )

        # Update session
        self._session.add_error(f"Trial {trial_number}: {error[:100]}")

    def run(self, *args, **kwargs):
        """
        Run optimization with context engineering.

        Passes through to wrapped runner.run() with context tracking.
        """
        # Update session state
        study_name = kwargs.get('study_name', 'unknown')
        self._session.exposed.study_name = study_name
        self._session.exposed.study_status = "running"

        try:
            # Run optimization
            result = self._runner.run(*args, **kwargs)

            # Finalize context engineering
            self._finalize(study_name)

            return result

        except Exception as e:
            self._session.add_error(f"Study failed: {str(e)}")
            raise

    def _finalize(self, study_name: str) -> None:
        """Finalize context engineering after optimization."""
        total_trials = self._stats["trials_observed"]
        success_rate = (
            self._stats["successful_trials"] / total_trials
            if total_trials > 0 else 0
        )

        # Finalize feedback loop
        result = self._feedback_loop.finalize_study({
            "name": study_name,
            "total_trials": total_trials,
            "best_value": getattr(self._runner, 'best_value', 0),
            "convergence_rate": success_rate
        })

        self._stats["insights_generated"] = result.get("insights_added", 0)

        # Update session
        self._session.exposed.study_status = "completed"
        self._session.exposed.trials_completed = total_trials

    def get_learning_report(self) -> Dict[str, Any]:
        """Get report on what the system learned."""
        return {
            "statistics": self._stats,
            "playbook_size": len(self._playbook.items),
            "playbook_stats": self._playbook.get_stats(),
            "feedback_stats": self._feedback_loop.get_statistics(),
            "top_insights": self._feedback_loop.get_top_performers(10),
            "compaction_stats": (
                self._compaction.get_stats() if self._compaction else None
            )
        }

    def get_context(self) -> str:
        """Get current context string for LLM."""
        parts = [self._session.get_llm_context()]

        if self._compaction:
            parts.append(self._compaction.get_context_string())

        playbook_context = self._playbook.get_context_for_task("optimization")
        if playbook_context:
            parts.append(playbook_context)

        return "\n\n---\n\n".join(parts)

    def __getattr__(self, name):
        """Delegate unknown attributes to wrapped runner."""
        return getattr(self._runner, name)