"""
Benchmark Builder Module

Provides interactive tools for creating custom benchmarks.
"""

from dataclasses import dataclass, field
from typing import List, Dict, Optional, Any, Callable
import json
import time
from pathlib import Path


@dataclass
class Benchmark:
    """
    A single benchmark test (builder variant).

    This is a builder-specific implementation with enhanced
    interactive creation features.
    """
    name: str
    description: str = ""
    questions: List[Dict[str, Any]] = field(default_factory=list)
    metadata: Dict[str, Any] = field(default_factory=dict)
    created_at: Optional[str] = None
    domain: str = "general"
    difficulty: str = "mixed"
    passing_score: float = 70.0
    categories: List[str] = field(default_factory=list)
    tags: List[str] = field(default_factory=list)

    def __post_init__(self):
        """Initialize timestamp if not provided."""
        if self.created_at is None:
            self.created_at = time.strftime('%Y-%m-%d %H:%M:%S')

    def add_question(
        self,
        question: str,
        answer: str,
        category: Optional[str] = None,
        difficulty: Optional[str] = None,
        metadata: Optional[Dict] = None,
        explanation: Optional[str] = None,
        points: float = 1.0
    ):
        """
        Add a question to the benchmark.

        Args:
            question: Question text
            answer: Expected answer
            category: Question category/topic
            difficulty: Difficulty level
            metadata: Additional metadata
            explanation: Answer explanation
            points: Points for this question
        """
        question_dict = {
            'id': len(self.questions),
            'question': question,
            'answer': answer,
            'category': category or 'general',
            'difficulty': difficulty or 'intermediate',
            'explanation': explanation or '',
            'points': points,
            'metadata': metadata or {}
        }
        self.questions.append(question_dict)

        # Update categories list
        if category and category not in self.categories:
            self.categories.append(category)

    def add_multiple_choice_question(
        self,
        question: str,
        choices: List[str],
        correct_answer: str,
        category: Optional[str] = None,
        difficulty: Optional[str] = None,
        explanation: Optional[str] = None
    ):
        """
        Add a multiple choice question.

        Args:
            question: Question text
            choices: List of answer choices
            correct_answer: The correct answer
            category: Question category
            difficulty: Difficulty level
            explanation: Answer explanation
        """
        self.add_question(
            question=question,
            answer=correct_answer,
            category=category,
            difficulty=difficulty,
            explanation=explanation,
            metadata={
                'type': 'multiple_choice',
                'choices': choices
            }
        )

    def import_from_json(self, filepath: str):
        """
        Import questions from JSON file.

        Args:
            filepath: Path to JSON file
        """
        with open(filepath, 'r', encoding='utf-8') as f:
            data = json.load(f)

        # Handle different JSON formats
        if isinstance(data, list):
            # List of questions
            for item in data:
                self.add_question(
                    question=item.get('question', ''),
                    answer=item.get('answer', ''),
                    category=item.get('category'),
                    difficulty=item.get('difficulty'),
                    metadata=item.get('metadata', {})
                )
        elif isinstance(data, dict):
            # Benchmark format
            if 'questions' in data:
                for item in data['questions']:
                    self.add_question(
                        question=item.get('question', ''),
                        answer=item.get('answer', ''),
                        category=item.get('category'),
                        difficulty=item.get('difficulty'),
                        metadata=item.get('metadata', {})
                    )

        print(f"Imported {len(self.questions)} questions from {filepath}")

    def import_from_csv(self, filepath: str, delimiter: str = ','):
        """
        Import questions from CSV file.

        Expected columns: question, answer, category, difficulty

        Args:
            filepath: Path to CSV file
            delimiter: CSV delimiter
        """
        import csv

        with open(filepath, 'r', encoding='utf-8') as f:
            reader = csv.DictReader(f, delimiter=delimiter)

            for row in reader:
                self.add_question(
                    question=row.get('question', ''),
                    answer=row.get('answer', ''),
                    category=row.get('category'),
                    difficulty=row.get('difficulty')
                )

        print(f"Imported {len(self.questions)} questions from CSV")

    def get_statistics(self) -> Dict[str, Any]:
        """Get benchmark statistics."""
        stats = {
            'total_questions': len(self.questions),
            'categories': {},
            'difficulties': {},
            'avg_question_length': 0,
            'avg_answer_length': 0
        }

        # Count by category
        for q in self.questions:
            cat = q.get('category', 'uncategorized')
            stats['categories'][cat] = stats['categories'].get(cat, 0) + 1

            diff = q.get('difficulty', 'unknown')
            stats['difficulties'][diff] = stats['difficulties'].get(diff, 0) + 1

        # Calculate averages
        if self.questions:
            total_q_len = sum(len(q['question']) for q in self.questions)
            total_a_len = sum(len(q['answer']) for q in self.questions)
            stats['avg_question_length'] = total_q_len / len(self.questions)
            stats['avg_answer_length'] = total_a_len / len(self.questions)

        return stats

    def validate(self) -> List[str]:
        """
        Validate benchmark and return list of issues.

        Returns:
            List of validation issues (empty if valid)
        """
        issues = []

        if not self.name:
            issues.append("Benchmark name is required")

        if not self.questions:
            issues.append("Benchmark has no questions")

        for i, q in enumerate(self.questions):
            if not q.get('question'):
                issues.append(f"Question {i} is missing question text")
            if not q.get('answer'):
                issues.append(f"Question {i} is missing answer")

        return issues

    def to_dict(self) -> Dict[str, Any]:
        """Convert benchmark to dictionary."""
        return {
            'name': self.name,
            'description': self.description,
            'domain': self.domain,
            'difficulty': self.difficulty,
            'passing_score': self.passing_score,
            'created_at': self.created_at,
            'categories': self.categories,
            'tags': self.tags,
            'num_questions': len(self.questions),
            'questions': self.questions,
            'metadata': self.metadata,
            'statistics': self.get_statistics()
        }

    @classmethod
    def from_dict(cls, data: Dict[str, Any]) -> 'Benchmark':
        """Create benchmark from dictionary."""
        return cls(
            name=data.get('name', 'Untitled'),
            description=data.get('description', ''),
            questions=data.get('questions', []),
            metadata=data.get('metadata', {}),
            created_at=data.get('created_at'),
            domain=data.get('domain', 'general'),
            difficulty=data.get('difficulty', 'mixed'),
            passing_score=data.get('passing_score', 70.0),
            categories=data.get('categories', []),
            tags=data.get('tags', [])
        )

    def save(self, filepath: str):
        """Save benchmark to JSON file."""
        Path(filepath).parent.mkdir(parents=True, exist_ok=True)

        with open(filepath, 'w', encoding='utf-8') as f:
            json.dump(self.to_dict(), f, indent=2, ensure_ascii=False)

        print(f"Benchmark saved to: {filepath}")

    @classmethod
    def load(cls, filepath: str) -> 'Benchmark':
        """Load benchmark from JSON file."""
        with open(filepath, 'r', encoding='utf-8') as f:
            data = json.load(f)

        return cls.from_dict(data)


class BenchmarkSuite:
    """
    Collection of benchmarks with enhanced building features.
    """

    def __init__(self, name: str = "Default Suite"):
        """
        Initialize benchmark suite.

        Args:
            name: Suite name
        """
        self.name = name
        self.description = ""
        self.benchmarks: List[Benchmark] = []
        self.metadata: Dict[str, Any] = {}

    def add_benchmark(self, benchmark: Benchmark):
        """Add a benchmark to the suite."""
        self.benchmarks.append(benchmark)
        print(f"Added benchmark: {benchmark.name}")

    def create_benchmark(
        self,
        name: str,
        description: str = "",
        domain: str = "general",
        passing_score: float = 70.0
    ) -> Benchmark:
        """
        Create a new benchmark and add to suite.

        Args:
            name: Benchmark name
            description: Benchmark description
            domain: Domain/topic
            passing_score: Passing score percentage

        Returns:
            Created benchmark
        """
        benchmark = Benchmark(
            name=name,
            description=description,
            domain=domain,
            passing_score=passing_score
        )
        self.add_benchmark(benchmark)
        return benchmark

    def get_benchmark(self, name: str) -> Optional[Benchmark]:
        """Get a benchmark by name."""
        for benchmark in self.benchmarks:
            if benchmark.name == name:
                return benchmark
        return None

    def remove_benchmark(self, benchmark_name: str):
        """Remove a benchmark by name."""
        self.benchmarks = [b for b in self.benchmarks if b.name != benchmark_name]

    def list_benchmarks(self) -> List[str]:
        """Get list of benchmark names."""
        return [b.name for b in self.benchmarks]

    def get_statistics(self) -> Dict[str, Any]:
        """Get suite-wide statistics."""
        total_questions = sum(len(b.questions) for b in self.benchmarks)

        stats = {
            'num_benchmarks': len(self.benchmarks),
            'total_questions': total_questions,
            'benchmarks': []
        }

        for benchmark in self.benchmarks:
            stats['benchmarks'].append({
                'name': benchmark.name,
                'num_questions': len(benchmark.questions),
                'domain': benchmark.domain,
                'passing_score': benchmark.passing_score
            })

        return stats

    def to_dict(self) -> Dict[str, Any]:
        """Convert suite to dictionary."""
        return {
            'name': self.name,
            'description': self.description,
            'num_benchmarks': len(self.benchmarks),
            'benchmarks': [b.to_dict() for b in self.benchmarks],
            'metadata': self.metadata,
            'statistics': self.get_statistics()
        }

    @classmethod
    def from_dict(cls, data: Dict[str, Any]) -> 'BenchmarkSuite':
        """Create suite from dictionary."""
        suite = cls(name=data.get('name', 'Default Suite'))
        suite.description = data.get('description', '')
        suite.metadata = data.get('metadata', {})

        for benchmark_data in data.get('benchmarks', []):
            benchmark = Benchmark.from_dict(benchmark_data)
            suite.add_benchmark(benchmark)

        return suite

    def save(self, filepath: str):
        """Save suite to JSON file."""
        Path(filepath).parent.mkdir(parents=True, exist_ok=True)

        with open(filepath, 'w', encoding='utf-8') as f:
            json.dump(self.to_dict(), f, indent=2, ensure_ascii=False)

        print(f"Benchmark suite saved to: {filepath}")

    @classmethod
    def load(cls, filepath: str) -> 'BenchmarkSuite':
        """Load suite from JSON file."""
        with open(filepath, 'r', encoding='utf-8') as f:
            data = json.load(f)

        return cls.from_dict(data)


class InteractiveBenchmarkBuilder:
    """
    Interactive builder for creating benchmarks through UI/CLI.
    """

    def __init__(self):
        """Initialize builder."""
        self.current_benchmark: Optional[Benchmark] = None
        self.current_suite: Optional[BenchmarkSuite] = None

    def create_benchmark(
        self,
        name: str,
        description: str = "",
        domain: str = "general"
    ) -> Benchmark:
        """
        Create a new benchmark.

        Args:
            name: Benchmark name
            description: Description
            domain: Domain/topic

        Returns:
            Created benchmark
        """
        self.current_benchmark = Benchmark(
            name=name,
            description=description,
            domain=domain
        )
        return self.current_benchmark

    def add_question_interactive(
        self,
        question: str,
        answer: str,
        category: Optional[str] = None,
        difficulty: Optional[str] = None
    ) -> bool:
        """
        Add question to current benchmark.

        Args:
            question: Question text
            answer: Answer text
            category: Category
            difficulty: Difficulty level

        Returns:
            Success status
        """
        if not self.current_benchmark:
            print("No active benchmark. Create one first.")
            return False

        self.current_benchmark.add_question(
            question=question,
            answer=answer,
            category=category,
            difficulty=difficulty
        )
        return True

    def preview_benchmark(self) -> str:
        """Preview current benchmark."""
        if not self.current_benchmark:
            return "No active benchmark"

        stats = self.current_benchmark.get_statistics()

        preview = f"""
Benchmark: {self.current_benchmark.name}
Description: {self.current_benchmark.description}
Domain: {self.current_benchmark.domain}
Total Questions: {stats['total_questions']}

Categories:
"""
        for cat, count in stats['categories'].items():
            preview += f"  - {cat}: {count} questions\n"

        return preview

    def finalize_benchmark(self, filepath: Optional[str] = None) -> Benchmark:
        """
        Finalize and optionally save benchmark.

        Args:
            filepath: Optional save path

        Returns:
            Finalized benchmark
        """
        if not self.current_benchmark:
            raise ValueError("No active benchmark to finalize")

        issues = self.current_benchmark.validate()
        if issues:
            print("Validation warnings:")
            for issue in issues:
                print(f"  - {issue}")

        if filepath:
            self.current_benchmark.save(filepath)

        benchmark = self.current_benchmark
        self.current_benchmark = None
        return benchmark