#!/usr/bin/env python3
"""
Code Completion Benchmark for CodeReality-1T Dataset
Evaluates code completion models using Pass@k metrics
"""

import json
import os
import re
import random
from typing import Dict, List, Tuple, Optional
from collections import defaultdict

def load_dataset_sample(data_dir: str, sample_size: int = 200) -> List[Dict]:
    """Load sample of repositories with code files."""
    print(f"🔍 Loading sample of {sample_size} repositories with code files...")

    repositories = []
    files = [f for f in os.listdir(data_dir) if f.endswith('.jsonl')]
    random.shuffle(files)

    for filename in files[:15]:  # Sample from first 15 files
        file_path = os.path.join(data_dir, filename)
        try:
            with open(file_path, 'r', encoding='utf-8', errors='ignore') as f:
                for line in f:
                    if len(repositories) >= sample_size:
                        break
                    try:
                        repo_data = json.loads(line)
                        # Filter repositories with code files
                        if has_code_files(repo_data):
                            repositories.append(repo_data)
                    except json.JSONDecodeError:
                        continue
        except Exception as e:
            continue

        if len(repositories) >= sample_size:
            break

    print(f"✅ Loaded {len(repositories)} repositories with code files")
    return repositories

def has_code_files(repo: Dict) -> bool:
    """Check if repository contains code files."""
    code_extensions = {'.py', '.js', '.java', '.cpp', '.c', '.go', '.rs', '.ts'}

    files = repo.get('files', [])
    for file_obj in files:
        if isinstance(file_obj, dict):
            file_path = file_obj.get('path', '')
            if any(file_path.endswith(ext) for ext in code_extensions):
                return True
    return False

def extract_function_snippets(repo: Dict, language: str = 'python') -> List[Dict]:
    """Extract function definitions for completion tasks."""
    snippets = []

    # Language-specific patterns
    patterns = {
        'python': r'def\s+(\w+)\s*\([^)]*\):\s*',
        'javascript': r'function\s+(\w+)\s*\([^)]*\)\s*{',
        'java': r'(?:public|private|protected)?\s*(?:static)?\s*\w+\s+(\w+)\s*\([^)]*\)\s*{',
        'cpp': r'\w+\s+(\w+)\s*\([^)]*\)\s*{',
    }

    if language not in patterns:
        return snippets

    pattern = patterns[language]
    extension_map = {
        'python': '.py',
        'javascript': '.js',
        'java': '.java',
        'cpp': '.cpp'
    }

    target_ext = extension_map[language]

    files = repo.get('files', [])
    for file_obj in files:
        if isinstance(file_obj, dict):
            file_path = file_obj.get('path', '')
            content = file_obj.get('content', '')

            if file_path.endswith(target_ext) and content:
                matches = list(re.finditer(pattern, content, re.MULTILINE))

                for match in matches:
                    start_pos = match.start()
                    function_name = match.group(1)

                    # Get context before function
                    lines_before = content[:start_pos].split('\n')
                    context_lines = lines_before[-5:] if len(lines_before) >= 5 else lines_before
                    context = '\n'.join(context_lines)

                    # Get function body (simplified - until next function or end)
                    remaining_content = content[start_pos:]
                    lines = remaining_content.split('\n')

                    function_lines = []
                    indent_level = None

                    for i, line in enumerate(lines):
                        if i == 0:
                            function_lines.append(line)
                            continue

                        # Detect indentation level
                        if indent_level is None and line.strip():
                            indent_level = len(line) - len(line.lstrip())

                        # Stop if we hit same or lower indentation level (end of function)
                        if line.strip() and indent_level is not None:
                            current_indent = len(line) - len(line.lstrip())
                            if current_indent <= indent_level and not line.strip().startswith(('if', 'for', 'while', 'try', 'except', 'else', 'elif')):
                                break

                        function_lines.append(line)

                        # Limit function length
                        if len(function_lines) > 20:
                            break

                    function_body = '\n'.join(function_lines)

                    # Create completion task: provide function signature, expect body
                    if len(function_lines) > 3:  # Only meaningful functions
                        snippets.append({
                            'function_name': function_name,
                            'context': context,
                            'prompt': function_lines[0],  # Function signature
                            'completion': '\n'.join(function_lines[1:]),  # Function body
                            'file_path': file_path,
                            'language': language
                        })

    return snippets

def simple_code_completion_model(prompt: str, language: str) -> List[str]:
    """Simple rule-based code completion for demonstration."""
    completions = []

    # Generate multiple completions (for Pass@k evaluation)
    templates = {
        'python': [
            "    pass",
            "    return None",
            "    # TODO: implement this function\n    pass",
            "    result = None\n    return result",
            "    # Implementation needed\n    raise NotImplementedError()"
        ],
        'javascript': [
            "    return null;",
            "    // TODO: implement\n    return;",
            "    throw new Error('Not implemented');",
            "    var result = null;\n    return result;",
            "    console.log('Function called');\n    return;"
        ],
        'java': [
            "    return null;",
            "    // TODO: implement this method\n    return null;",
            "    throw new UnsupportedOperationException();",
            "    Object result = null;\n    return result;",
            "    System.out.println(\"Method called\");\n    return null;"
        ]
    }

    if language in templates:
        # Return multiple variations for Pass@k evaluation
        return templates[language]
    else:
        return ["// TODO: implement"]

def evaluate_completion_quality(predicted: str, actual: str) -> float:
    """Simple evaluation of completion quality."""
    # Normalize strings
    pred_lines = [line.strip() for line in predicted.split('\n') if line.strip()]
    actual_lines = [line.strip() for line in actual.split('\n') if line.strip()]

    if not actual_lines:
        return 0.0

    # Check for basic structural similarity
    score = 0.0

    # Check if both are empty implementations
    empty_indicators = ['pass', 'todo', 'not implemented', 'null', 'return;', 'return null'}
    pred_empty = any(indicator in predicted.lower() for indicator in empty_indicators)
    actual_empty = any(indicator in actual.lower() for indicator in empty_indicators)

    if pred_empty and actual_empty:
        score += 0.8
    elif not pred_empty and not actual_empty:
        # Check for keyword similarity
        pred_keywords = set(re.findall(r'\b\w+\b', predicted.lower()))
        actual_keywords = set(re.findall(r'\b\w+\b', actual.lower()))

        if actual_keywords:
            keyword_overlap = len(pred_keywords & actual_keywords) / len(actual_keywords)
            score += keyword_overlap * 0.6

        # Check for similar line count
        line_ratio = min(len(pred_lines), len(actual_lines)) / max(len(pred_lines), len(actual_lines))
        score += line_ratio * 0.4

    return min(score, 1.0)

def calculate_pass_at_k(completion_results: List[Tuple[List[str], str]], k: int = 1) -> float:
    """Calculate Pass@k metric."""
    if k <= 0:
        return 0.0

    total_passed = 0

    for completions, ground_truth in completion_results:
        # Take top k completions
        top_k_completions = completions[:k]

        # Check if any completion passes
        passed = False
        for completion in top_k_completions:
            quality_score = evaluate_completion_quality(completion, ground_truth)
            if quality_score > 0.5:  # Threshold for "passing"
                passed = True
                break

        if passed:
            total_passed += 1

    return total_passed / len(completion_results) if completion_results else 0.0

def run_completion_benchmark(repositories: List[Dict]) -> Dict:
    """Run code completion benchmark."""
    print("🧮 Running code completion benchmark...")

    results = {
        'total_repositories': len(repositories),
        'completion_tasks': [],
        'language_stats': defaultdict(int),
        'pass_at_1': 0.0,
        'pass_at_3': 0.0,
        'pass_at_5': 0.0,
        'average_quality': 0.0
    }

    completion_results = []
    quality_scores = []

    # Extract function snippets from repositories
    for repo in repositories:
        for language in ['python', 'javascript', 'java']:
            snippets = extract_function_snippets(repo, language)

            for snippet in snippets[:2]:  # Limit per repo for performance
                results['language_stats'][language] += 1

                # Generate completions
                completions = simple_code_completion_model(snippet['prompt'], language)
                ground_truth = snippet['completion']

                completion_results.append((completions, ground_truth))

                # Calculate quality for first completion
                if completions:
                    quality = evaluate_completion_quality(completions[0], ground_truth)
                    quality_scores.append(quality)

                results['completion_tasks'].append({
                    'function_name': snippet['function_name'],
                    'language': language,
                    'prompt_length': len(snippet['prompt']),
                    'completion_length': len(ground_truth)
                })

    # Calculate metrics
    results['pass_at_1'] = calculate_pass_at_k(completion_results, 1)
    results['pass_at_3'] = calculate_pass_at_k(completion_results, 3)
    results['pass_at_5'] = calculate_pass_at_k(completion_results, 5)
    results['average_quality'] = sum(quality_scores) / len(quality_scores) if quality_scores else 0.0

    return results

def print_benchmark_results(results: Dict):
    """Print formatted benchmark results."""
    print("=" * 60)
    print("🎯 CODE COMPLETION BENCHMARK RESULTS")
    print("=" * 60)

    print(f"Total repositories: {results['total_repositories']}")
    print(f"Completion tasks: {len(results['completion_tasks'])}")

    print(f"\n📊 Pass@k Metrics:")
    print(f"  Pass@1: {results['pass_at_1']:.3f}")
    print(f"  Pass@3: {results['pass_at_3']:.3f}")
    print(f"  Pass@5: {results['pass_at_5']:.3f}")
    print(f"  Average Quality: {results['average_quality']:.3f}")

    print(f"\n🔤 Language Distribution:")
    for language, count in sorted(results['language_stats'].items(), key=lambda x: x[1], reverse=True):
        print(f"  {language}: {count} functions")

    print(f"\n💡 Insights:")
    print("- This is a simplified demonstration benchmark")
    print("- Real evaluation requires more sophisticated code execution")
    print("- CodeReality-1T provides diverse, noisy code for robust testing")
    print("- Consider functional correctness testing for production models")

def main():
    """Run code completion benchmark."""
    print("🚀 CodeReality-1T Code Completion Benchmark")
    print("=" * 60)

    # Configuration
    data_dir = "/mnt/z/CodeReality_Final/unified_dataset"
    sample_size = 100

    if not os.path.exists(data_dir):
        print(f"❌ Dataset directory not found: {data_dir}")
        print("Please update the data_dir path to point to your CodeReality-1T dataset")
        return

    # Load dataset sample
    repositories = load_dataset_sample(data_dir, sample_size)

    if not repositories:
        print("❌ No repositories loaded. Check dataset path.")
        return

    # Run benchmark
    results = run_completion_benchmark(repositories)

    # Print results
    print_benchmark_results(results)

    # Save results
    output_file = "code_completion_results.json"
    with open(output_file, 'w') as f:
        # Convert defaultdict to regular dict for JSON serialization
        results_json = {
            'total_repositories': results['total_repositories'],
            'completion_tasks': results['completion_tasks'],
            'language_stats': dict(results['language_stats']),
            'pass_at_1': results['pass_at_1'],
            'pass_at_3': results['pass_at_3'],
            'pass_at_5': results['pass_at_5'],
            'average_quality': results['average_quality']
        }
        json.dump(results_json, f, indent=2)

    print(f"\n💾 Results saved to: {output_file}")

if __name__ == "__main__":
    main()