"""
AETHER Core: Central orchestrator integrating all subsystems.
Design: Neuro-Symbolic Fluidity + Constrained Self-Modification
"""

import torch
import torch.nn as nn
from typing import Dict, List, Any, Optional, Callable
import logging
from dataclasses import dataclass, field
import json
import hashlib
import time

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger("AETHER.Core")


@dataclass
class AetherConfig:
    """Configuration for AETHER system evolution."""
    # Evolution
    population_size: int = 8
    generations: int = 10
    mutation_rate: float = 0.15
    crossover_rate: float = 0.3
    
    # Safety
    sandbox_timeout: float = 30.0
    max_architecture_depth: int = 5
    require_human_approval: bool = False
    
    # Hierarchical Reasoning
    macro_policy_dim: int = 256
    micro_policy_dim: int = 128
    num_agents: int = 4
    
    # Memory
    working_memory_capacity: int = 16
    episodic_buffer_size: int = 1000
    
    # Knowledge
    kg_embedding_dim: int = 128
    kg_num_relations: int = 20
    
    # Training
    learning_rate: float = 2e-5
    batch_size: int = 4
    gradient_accumulation_steps: int = 8
    
    # Meta
    enable_self_modification: bool = True
    enable_parallel_agents: bool = True
    log_level: str = "INFO"


class AetherCore(nn.Module):
    """
    Central controller for AETHER.
    Manages the recursive evolution loop, agent orchestration,
    knowledge integration, and safety constraints.
    """
    
    def __init__(self, config: Optional[AetherConfig] = None, 
                 model_name: str = "Qwen/Qwen2.5-0.5B-Instruct"):
        super().__init__()
        self.config = config or AetherConfig()
        self.model_name = model_name
        
        # Subsystems (initialized lazily)
        self._memory = None
        self._evolution = None
        self._agents = None
        self._knowledge = None
        self._safety = None
        
        # State tracking
        self.generation = 0
        self.architecture_history: List[Dict] = []
        self.fitness_log: List[float] = []
        self.metadata: Dict[str, Any] = {
            "birth_timestamp": time.time(),
            "model_name": model_name,
            "version": "0.1.0",
        }
        
        # Neuro-symbolic bridge: learned attention over symbolic rules
        self.symbolic_gate = nn.Parameter(torch.randn(1))
        self.neural_gate = nn.Parameter(torch.randn(1))
        
        logger.info(f"AETHER Core initialized with model: {model_name}")
    
    @property
    def memory(self):
        if self._memory is None:
            from .memory import CoALAMemory, TemporalMemory
            self._memory = {
                "working": CoALAMemory(capacity=self.config.working_memory_capacity),
                "temporal": TemporalMemory(buffer_size=self.config.episodic_buffer_size),
            }
        return self._memory
    
    @property
    def evolution(self):
        if self._evolution is None:
            from .evolution import AetherEvolutionEngine
            self._evolution = AetherEvolutionEngine(self.config)
        return self._evolution
    
    @property
    def agents(self):
        if self._agents is None:
            from .agents import AetherAgentOrchestrator
            self._agents = AetherAgentOrchestrator(self.config)
        return self._agents
    
    @property
    def knowledge(self):
        if self._knowledge is None:
            from .knowledge import KnowledgeGraphEngine
            self._knowledge = KnowledgeGraphEngine(
                embedding_dim=self.config.kg_embedding_dim,
                num_relations=self.config.kg_num_relations,
            )
        return self._knowledge
    
    @property
    def safety(self):
        if self._safety is None:
            from .safety import SafetySandbox
            self._safety = SafetySandbox(timeout=self.config.sandbox_timeout)
        return self._safety
    
    def forward(self, task: str, context: Optional[Dict] = None) -> Dict[str, Any]:
        """
        Main forward pass: given a task, orchestrate agents, query knowledge,
        and produce output through neuro-symbolic fusion.
        """
        context = context or {}
        
        # 1. Retrieve relevant knowledge
        kg_context = self.knowledge.query(task, top_k=5)
        
        # 2. Load into working memory
        self.memory["working"].store({
            "task": task,
            "kg_context": kg_context,
            "timestamp": time.time(),
        })
        
        # 3. Hierarchical agent execution
        result = self.agents.execute(task, kg_context, context)
        
        # 4. Neuro-symbolic fusion gate
        symbolic_weight = torch.sigmoid(self.symbolic_gate)
        neural_weight = torch.sigmoid(self.neural_gate)
        
        # Normalize
        total = symbolic_weight + neural_weight + 1e-8
        symbolic_weight = symbolic_weight / total
        neural_weight = neural_weight / total
        
        # 5. Store to episodic memory
        self.memory["temporal"].store({
            "task": task,
            "result": result,
            "weights": {
                "symbolic": symbolic_weight.item(),
                "neural": neural_weight.item(),
            }
        })
        
        return {
            "output": result,
            "symbolic_weight": symbolic_weight.item(),
            "neural_weight": neural_weight.item(),
            "kg_context": kg_context,
            "generation": self.generation,
        }
    
    def evolve(self, evaluation_function: Callable[[Dict], float],
               num_generations: Optional[int] = None) -> Dict[str, Any]:
        """
        Recursive evolutionary loop: generate candidates, evaluate,
        select, mutate, validate, integrate.
        Based on AlphaEvolve + GEA + ASI-Evolve methodology.
        """
        num_generations = num_generations or self.config.generations
        
        logger.info(f"Starting evolution for {num_generations} generations")
        
        best_fitness = -float('inf')
        best_config = None
        
        for gen in range(num_generations):
            self.generation = gen
            
            # Generate candidate variants
            candidates = self.evolution.generate_candidates(
                base_config=self.config,
                population_size=self.config.population_size,
            )
            
            # Evaluate each candidate
            fitness_scores = []
            for candidate in candidates:
                # Safety sandbox evaluation
                with self.safety.sandbox():
                    try:
                        score = evaluation_function(candidate)
                        fitness_scores.append(score)
                    except Exception as e:
                        logger.warning(f"Candidate failed evaluation: {e}")
                        fitness_scores.append(-float('inf'))
            
            # Select top performers (Performance-Novelty from GEA)
            selected = self.evolution.select(
                candidates, fitness_scores,
                alpha_exploration=0.3,
            )
            
            # Apply constrained mutations
            mutated = self.evolution.mutate(
                selected,
                mutation_rate=self.config.mutation_rate,
                max_depth=self.config.max_architecture_depth,
            )
            
            # Validate stability
            validated = []
            for candidate in mutated:
                if self.safety.validate_architecture(candidate):
                    validated.append(candidate)
            
            # Integrate best
            if validated:
                best_idx = max(range(len(validated)), 
                              key=lambda i: fitness_scores[min(i, len(fitness_scores)-1)])
                best_candidate = validated[best_idx]
                current_fitness = fitness_scores[min(best_idx, len(fitness_scores)-1)]
                
                if current_fitness > best_fitness:
                    best_fitness = current_fitness
                    best_config = best_candidate
                    self.config = best_candidate
                    
                    # Log architecture change
                    arch_hash = hashlib.sha256(
                        json.dumps(best_candidate.__dict__, sort_keys=True).encode()
                    ).hexdigest()[:16]
                    self.architecture_history.append({
                        "generation": gen,
                        "hash": arch_hash,
                        "fitness": best_fitness,
                        "config": best_candidate.__dict__,
                    })
                    
                    logger.info(f"Gen {gen}: New best fitness={best_fitness:.4f}, hash={arch_hash}")
            
            self.fitness_log.append(best_fitness)
        
        return {
            "best_fitness": best_fitness,
            "best_config": best_config.__dict__ if best_config else None,
            "generations_evolved": num_generations,
            "architecture_history": self.architecture_history,
        }
    
    def self_reflect(self) -> Dict[str, Any]:
        """
        Meta-cognitive reflection on system performance and architecture.
        Inspired by GEA experience sharing and Yunjue Agent self-reflection.
        """
        reflection = {
            "generation": self.generation,
            "total_architectures_tested": len(self.architecture_history),
            "fitness_trend": self.fitness_log,
            "memory_stats": {
                "working_items": len(self.memory["working"].buffer),
                "episodic_items": len(self.memory["temporal"].buffer),
            },
            "knowledge_stats": self.knowledge.stats(),
            "agent_stats": self.agents.stats(),
            "neuro_symbolic_balance": {
                "symbolic_gate": torch.sigmoid(self.symbolic_gate).item(),
                "neural_gate": torch.sigmoid(self.neural_gate).item(),
            },
            "recommendations": self._generate_recommendations(),
        }
        return reflection
    
    def _generate_recommendations(self) -> List[str]:
        """Generate evolution directives based on performance analysis."""
        recs = []
        
        if len(self.fitness_log) > 5:
            recent = self.fitness_log[-5:]
            if max(recent) - min(recent) < 0.01:
                recs.append("Fitness plateau detected. Increase mutation rate or population diversity.")
            
            if recent[-1] < recent[0]:
                recs.append("Performance declining. Consider rolling back to earlier architecture.")
        
        sym_gate = torch.sigmoid(self.symbolic_gate).item()
        if sym_gate < 0.3:
            recs.append("Symbolic reasoning underutilized. Boost knowledge graph integration.")
        elif sym_gate > 0.7:
            recs.append("Symbolic dominance detected. Increase neural flexibility.")
        
        return recs
    
    def export_state(self) -> Dict[str, Any]:
        """Export full system state for checkpointing."""
        return {
            "config": self.config.__dict__,
            "generation": self.generation,
            "architecture_history": self.architecture_history,
            "fitness_log": self.fitness_log,
            "metadata": self.metadata,
            "knowledge_state": self.knowledge.export(),
            "memory_state": {
                "working": self.memory["working"].export(),
                "temporal": self.memory["temporal"].export(),
            },
            "model_state_dict": {k: v.cpu().tolist() for k, v in self.state_dict().items()},
        }
    
    @classmethod
    def from_state(cls, state: Dict[str, Any]) -> "AetherCore":
        """Restore AETHER from checkpoint."""
        config = AetherConfig(**state["config"])
        core = cls(config=config, model_name=state["metadata"]["model_name"])
        core.generation = state["generation"]
        core.architecture_history = state["architecture_history"]
        core.fitness_log = state["fitness_log"]
        core.metadata = state["metadata"]
        return core