"""
Model tracing evaluation for computing p-values from neuron matching statistics.

This module runs the model-tracing comparison using the main.py script from model-tracing
to determine structural similarity via p-value analysis.
"""

import os
import sys
import subprocess
import tempfile
import pickle
import statistics

# Check if model-tracing directory exists
model_tracing_path = os.path.join(os.path.dirname(__file__), '../../model-tracing')
MODEL_TRACING_AVAILABLE = os.path.exists(model_tracing_path) and os.path.exists(os.path.join(model_tracing_path, 'main.py'))

sys.stderr.write("🔧 CHECKING MODEL TRACING AVAILABILITY...\n")
sys.stderr.write(f"   - Model tracing path: {model_tracing_path}\n")
sys.stderr.write(f"   - Path exists: {os.path.exists(model_tracing_path)}\n")
sys.stderr.write(f"   - main.py exists: {os.path.exists(os.path.join(model_tracing_path, 'main.py'))}\n")
sys.stderr.write(f"🎯 Final MODEL_TRACING_AVAILABLE = {MODEL_TRACING_AVAILABLE}\n")
sys.stderr.flush()


def run_model_trace_analysis(ft_model_name, revision="main", precision="float16"):
    """
    Run model tracing analysis using the main.py script from model-tracing directory.
    
    Runs the exact command:
    python main.py --base_model_id meta-llama/Llama-2-7b-hf --ft_model_id <ft_model_name> --stat match --align
    
    Args:
        ft_model_name: HuggingFace model identifier for the fine-tuned model
        revision: Model revision/commit hash
        precision: Model precision (float16, bfloat16)
    
    Returns:
        tuple: (success: bool, result: float or error_message)
               If success, result is the aggregate p-value from aligned test stat
               If failure, result is error message
    """
    
    if not MODEL_TRACING_AVAILABLE:
        return False, "Model tracing main.py script not available"
    
    try:
        sys.stderr.write(f"\n=== RUNNING MODEL TRACE ANALYSIS VIA SUBPROCESS ===\n")
        sys.stderr.write(f"Base model: meta-llama/Llama-2-7b-hf\n")
        sys.stderr.write(f"Fine-tuned model: {ft_model_name}\n")
        sys.stderr.write(f"Revision: {revision}\n")
        sys.stderr.write(f"Precision: {precision}\n")
        sys.stderr.flush()
        
        # Create a temporary file for results
        with tempfile.NamedTemporaryFile(suffix='.pkl', delete=False) as tmp_file:
            tmp_results_path = tmp_file.name
        
        sys.stderr.write(f"📁 Temporary results file: {tmp_results_path}\n")
        sys.stderr.flush()
        
        # Build the command exactly as user specified
        base_model_id = "meta-llama/Llama-2-7b-hf"
        
        # Build the command
        cmd = [
            "python", "main.py",
            "--base_model_id", base_model_id,
            "--ft_model_id", ft_model_name,
            "--stat", "match",
            "--save", tmp_results_path
        ]
        
        # Add revision if not main/default
        if revision and revision != "main":
            # Note: main.py doesn't seem to have a revision flag, but we log it for reference
            sys.stderr.write(f"⚠️ Note: Revision '{revision}' specified but main.py doesn't support --revision flag\n")
            sys.stderr.flush()
        
        sys.stderr.write(f"🚀 Running command: {' '.join(cmd)}\n")
        sys.stderr.flush()
        
        # Change to model-tracing directory and run the command
        original_cwd = os.getcwd()
        try:
            os.chdir(model_tracing_path)
            sys.stderr.write(f"📂 Changed to directory: {model_tracing_path}\n")
            sys.stderr.flush()
            
            # Run the subprocess
            result = subprocess.run(
                cmd,
                capture_output=True,
                text=True,
                timeout=3600  # 1 hour timeout
            )
            
            sys.stderr.write(f"📊 Subprocess completed with return code: {result.returncode}\n")
            
            # Log stdout and stderr from the subprocess
            if result.stdout:
                sys.stderr.write(f"📝 STDOUT from model tracing:\n{result.stdout}\n")
            if result.stderr:
                sys.stderr.write(f"⚠️ STDERR from model tracing:\n{result.stderr}\n")
            sys.stderr.flush()
            
            if result.returncode != 0:
                error_msg = f"Model tracing script failed with return code {result.returncode}"
                if result.stderr:
                    error_msg += f"\nSTDERR: {result.stderr}"
                return False, error_msg
                
        finally:
            os.chdir(original_cwd)
            sys.stderr.write(f"📂 Changed back to directory: {original_cwd}\n")
            sys.stderr.flush()
        
        # Load and parse the results
        try:
            sys.stderr.write(f"📖 Loading results from: {tmp_results_path}\n")
            sys.stderr.flush()
            
            with open(tmp_results_path, 'rb') as f:
                results = pickle.load(f)
            
            sys.stderr.write(f"✅ Results loaded successfully\n")
            sys.stderr.write(f"📋 Available result keys: {list(results.keys())}\n")
            sys.stderr.flush()
            
            # Get the aligned test stat (this is what we want with --align flag)
            if "aligned test stat" in results:
                aligned_stat = results["aligned test stat"]
                sys.stderr.write(f"📊 Aligned test stat: {aligned_stat}\n")
                sys.stderr.write(f"📊 Type: {type(aligned_stat)}\n")
                
                # The match statistic returns a list of p-values per layer
                if isinstance(aligned_stat, list):
                    sys.stderr.write(f"📊 List of {len(aligned_stat)} p-values: {aligned_stat}\n")
                    
                    # Filter valid p-values
                    valid_p_values = [p for p in aligned_stat if p is not None and isinstance(p, (int, float)) and 0 <= p <= 1]
                    sys.stderr.write(f"📊 Valid p-values: {len(valid_p_values)}/{len(aligned_stat)}\n")
                    
                    if valid_p_values:
                        # Use median as the representative p-value
                        aggregate_p_value = statistics.median(valid_p_values)
                        sys.stderr.write(f"📊 Using median p-value: {aggregate_p_value}\n")
                    else:
                        sys.stderr.write("⚠️ No valid p-values found, using default\n")
                        aggregate_p_value = 1.0
                        
                elif isinstance(aligned_stat, (int, float)):
                    aggregate_p_value = float(aligned_stat)
                    sys.stderr.write(f"📊 Using single p-value: {aggregate_p_value}\n")
                else:
                    sys.stderr.write(f"⚠️ Unexpected aligned_stat type: {type(aligned_stat)}, using default\n")
                    aggregate_p_value = 1.0
                    
            else:
                sys.stderr.write("⚠️ No 'aligned test stat' found in results, checking non-aligned\n")
                if "non-aligned test stat" in results:
                    non_aligned_stat = results["non-aligned test stat"]
                    sys.stderr.write(f"📊 Using non-aligned test stat: {non_aligned_stat}\n")
                    
                    if isinstance(non_aligned_stat, list):
                        valid_p_values = [p for p in non_aligned_stat if p is not None and isinstance(p, (int, float)) and 0 <= p <= 1]
                        if valid_p_values:
                            aggregate_p_value = statistics.median(valid_p_values)
                        else:
                            aggregate_p_value = 1.0
                    else:
                        aggregate_p_value = float(non_aligned_stat) if isinstance(non_aligned_stat, (int, float)) else 1.0
                else:
                    sys.stderr.write("❌ No test stat found in results\n")
                    return False, "No test statistic found in results"
            
            sys.stderr.flush()
            
        except Exception as e:
            sys.stderr.write(f"❌ Failed to load results: {e}\n")
            sys.stderr.flush()
            return False, f"Failed to load results: {e}"
        
        finally:
            # Clean up temporary file
            try:
                os.unlink(tmp_results_path)
                sys.stderr.write(f"🗑️ Cleaned up temporary file: {tmp_results_path}\n")
            except:
                pass
        
        sys.stderr.write(f"✅ Final aggregate p-value: {aggregate_p_value}\n")
        sys.stderr.write("=== MODEL TRACE ANALYSIS COMPLETED ===\n")
        sys.stderr.flush()
        
        return True, aggregate_p_value
        
    except subprocess.TimeoutExpired:
        sys.stderr.write("❌ Model tracing analysis timed out after 1 hour\n")
        sys.stderr.flush()
        return False, "Analysis timed out"
        
    except Exception as e:
        error_msg = str(e)
        sys.stderr.write(f"💥 Error in model trace analysis: {error_msg}\n")
        import traceback
        sys.stderr.write(f"Traceback: {traceback.format_exc()}\n")
        sys.stderr.flush()
        return False, error_msg


def compute_model_trace_p_value(model_name, revision="main", precision="float16"):
    """
    Wrapper function to compute model trace p-value for a single model.
    
    Args:
        model_name: HuggingFace model identifier
        revision: Model revision
        precision: Model precision
    
    Returns:
        float or None: P-value if successful, None if failed
    """
    sys.stderr.write(f"\n{'='*60}\n")
    sys.stderr.write(f"COMPUTE_MODEL_TRACE_P_VALUE CALLED\n")
    sys.stderr.write(f"Model: {model_name}\n")
    sys.stderr.write(f"Revision: {revision}\n") 
    sys.stderr.write(f"Precision: {precision}\n")
    sys.stderr.write(f"Model tracing available: {MODEL_TRACING_AVAILABLE}\n")
    sys.stderr.write(f"{'='*60}\n")
    sys.stderr.flush()
    
    if not MODEL_TRACING_AVAILABLE:
        sys.stderr.write("❌ MODEL TRACING NOT AVAILABLE - returning None\n")
        sys.stderr.flush()
        return None
    
    try:
        sys.stderr.write("🚀 Starting model trace analysis...\n")
        sys.stderr.flush()
        
        success, result = run_model_trace_analysis(model_name, revision, precision)
        
        sys.stderr.write(f"📊 Analysis completed - Success: {success}, Result: {result}\n")
        sys.stderr.flush()
        
        if success:
            sys.stderr.write(f"✅ SUCCESS: Returning p-value {result}\n")
            sys.stderr.flush()
            return result
        else:
            sys.stderr.write(f"❌ FAILED: {result}\n")
            sys.stderr.write("🔄 Returning None as fallback\n")
            sys.stderr.flush()
            return None
            
    except Exception as e:
        sys.stderr.write(f"💥 CRITICAL ERROR in compute_model_trace_p_value for {model_name}:\n")
        sys.stderr.write(f"Exception: {e}\n")
        import traceback
        sys.stderr.write(f"Full traceback:\n{traceback.format_exc()}\n")
        sys.stderr.write("🔄 Returning None as fallback\n")
        sys.stderr.flush()
        return None