"""AimStack logging integration."""

from pathlib import Path
from typing import Dict, Any, Optional
import subprocess
import json
from datetime import datetime

try:
    from aim import Run
    HAS_AIM = True
except ImportError:
    HAS_AIM = False

from taoTrain.config import TrainingConfig


class AimLogger:
    """AimStack logger for tracking training metrics and hyperparameters."""
    
    def __init__(self, config: TrainingConfig):
        """
        Initialize AimStack logger.
        
        Args:
            config: Training configuration
        """
        self.config = config
        self.run: Optional[Run] = None
        
        if HAS_AIM:
            # Initialize AimStack run
            repo_path = Path(config.aim_repo)
            repo_path.mkdir(parents=True, exist_ok=True)
            
            self.run = Run(repo=str(repo_path))
            
            # Log hyperparameters
            self._log_hyperparameters()
        else:
            print("Warning: AimStack not installed. Install with: pip install aim")
    
    def _log_hyperparameters(self):
        """Log hyperparameters to AimStack."""
        if self.run is None:
            return
        
        # Log model config
        self.run["hparams/model"] = {
            "architecture": self.config.model.architecture_type.value,
            "vocab_size": self.config.model.vocab_size,
            "hidden_dim": self.config.model.hidden_dim,
            "num_layers": self.config.model.num_layers,
            "num_heads": self.config.model.num_heads,
            "dropout": self.config.model.dropout,
            "max_seq_length": self.config.model.max_seq_length,
        }
        
        # Log training config
        self.run["hparams/training"] = {
            "batch_size": self.config.batch_size,
            "num_epochs": self.config.num_epochs,
            "learning_rate": self.config.optimizer.learning_rate,
            "weight_decay": self.config.optimizer.weight_decay,
            "gradient_accumulation_steps": self.config.gradient_accumulation_steps,
            "max_grad_norm": self.config.max_grad_norm,
            "dtype": self.config.dtype.value,
            "seed": self.config.seed,
        }
        
        # Log optimizer and scheduler config
        self.run["hparams/optimizer"] = {
            "optimizer_type": self.config.optimizer.optimizer_type.value,
            "learning_rate": self.config.optimizer.learning_rate,
            "weight_decay": self.config.optimizer.weight_decay,
        }
        
        self.run["hparams/scheduler"] = {
            "scheduler_type": self.config.scheduler.scheduler_type.value,
            "warmup_steps": self.config.scheduler.warmup_steps,
            "warmup_ratio": self.config.scheduler.warmup_ratio,
        }
        
        # Log dataset config
        self.run["hparams/dataset"] = {
            "dataset_name": self.config.dataset.dataset_name,
            "split": self.config.dataset.split,
            "max_samples": self.config.dataset.max_samples,
        }
        
        # Log mode
        self.run["hparams/mode"] = self.config.mode.value
        
        # Log git hash if available
        try:
            git_hash = subprocess.check_output(
                ["git", "rev-parse", "HEAD"],
                stderr=subprocess.DEVNULL
            ).decode().strip()
            self.run["hparams/git_hash"] = git_hash
        except:
            pass
        
        # Log timestamp
        self.run["hparams/timestamp"] = datetime.now().isoformat()
    
    def log_metrics(self, metrics: Dict[str, Any], step: Optional[int] = None):
        """
        Log metrics to AimStack.
        
        Args:
            metrics: Dict of metric names to values
            step: Global step (optional, auto-increments if not provided)
        """
        if self.run is None:
            return
        
        step = metrics.pop("step", step)
        
        for metric_name, metric_value in metrics.items():
            # Flatten nested dicts
            if isinstance(metric_value, dict):
                for nested_key, nested_val in metric_value.items():
                    self.run.track(
                        float(nested_val),
                        name=f"{metric_name}/{nested_key}",
                        step=step,
                    )
            else:
                try:
                    self.run.track(
                        float(metric_value),
                        name=metric_name,
                        step=step,
                    )
                except (ValueError, TypeError):
                    # Skip non-numeric metrics
                    pass
    
    def log_text(self, name: str, value: str, step: Optional[int] = None):
        """Log text content."""
        if self.run is None:
            return
        
        # AimStack doesn't have direct text logging, use metadata
        metadata = getattr(self.run, '_metadata', {})
        if isinstance(metadata, dict):
            metadata[name] = value
    
    def finish(self):
        """Finish the run."""
        if self.run:
            self.run.close()