"""
ORM Mapper Agent

Generates ORM models from database schemas for various ORM frameworks.
"""

from typing import Any, Dict, List
from agents.base import BaseAgent


class ORMMapperAgent(BaseAgent):
    """
    Generates ORM models from database schemas.

    Supports:
    - SQLAlchemy (Python)
    - Django ORM (Python)
    - TypeORM (TypeScript)
    - Sequelize (JavaScript)
    - GORM (Go)
    - Diesel (Rust)
    """

    def __init__(self):
        super().__init__(
            name='orm-mapper',
            description='Generate ORM models from database schemas',
            category='engineering',
            version='1.0.0',
            tags=['orm', 'database', 'models', 'code-generation']
        )

    async def execute(self, params: Dict[str, Any]) -> Dict[str, Any]:
        """
        Generate ORM models.

        Args:
            params: {
                'schema_source': str,    # Path to schema file or database connection
                'orm_framework': 'sqlalchemy|django|typeorm|sequelize|gorm|diesel',
                'language': 'python|typescript|javascript|go|rust',
                'options': {
                    'add_relationships': bool,
                    'add_validators': bool,
                    'add_serializers': bool,
                    'add_migrations': bool,
                    'type_hints': bool
                }
            }

        Returns:
            {
                'status': 'success|failed',
                'models_generated': List[Dict],
                'files_generated': List[str],
                'relationships_mapped': int,
                'validators_added': int
            }
        """
        schema_source = params.get('schema_source')
        orm_framework = params.get('orm_framework', 'sqlalchemy')
        language = params.get('language', 'python')
        options = params.get('options', {})

        self.logger.info(
            f"Generating {orm_framework} models from {schema_source}"
        )

        # Mock ORM model generation
        models = [
            {
                'name': 'User',
                'table_name': 'users',
                'fields': [
                    {'name': 'id', 'type': 'UUID', 'primary_key': True},
                    {'name': 'email', 'type': 'String', 'unique': True},
                    {'name': 'username', 'type': 'String', 'unique': True},
                    {'name': 'password_hash', 'type': 'String'},
                    {'name': 'created_at', 'type': 'DateTime'},
                    {'name': 'updated_at', 'type': 'DateTime'}
                ],
                'relationships': [
                    {'name': 'orders', 'type': 'one_to_many', 'model': 'Order'}
                ],
                'validators': ['email_validator', 'username_length'],
                'methods': ['set_password', 'check_password', 'to_dict']
            },
            {
                'name': 'Product',
                'table_name': 'products',
                'fields': [
                    {'name': 'id', 'type': 'UUID', 'primary_key': True},
                    {'name': 'name', 'type': 'String'},
                    {'name': 'description', 'type': 'Text'},
                    {'name': 'price', 'type': 'Decimal'},
                    {'name': 'stock', 'type': 'Integer'},
                    {'name': 'category_id', 'type': 'UUID'}
                ],
                'relationships': [
                    {'name': 'category', 'type': 'many_to_one', 'model': 'Category'},
                    {'name': 'order_items', 'type': 'one_to_many', 'model': 'OrderItem'}
                ],
                'validators': ['price_positive', 'stock_non_negative'],
                'methods': ['is_in_stock', 'calculate_discount', 'to_dict']
            },
            {
                'name': 'Order',
                'table_name': 'orders',
                'fields': [
                    {'name': 'id', 'type': 'UUID', 'primary_key': True},
                    {'name': 'user_id', 'type': 'UUID'},
                    {'name': 'status', 'type': 'String'},
                    {'name': 'total_amount', 'type': 'Decimal'},
                    {'name': 'created_at', 'type': 'DateTime'}
                ],
                'relationships': [
                    {'name': 'user', 'type': 'many_to_one', 'model': 'User'},
                    {'name': 'items', 'type': 'one_to_many', 'model': 'OrderItem'}
                ],
                'validators': ['status_valid', 'total_positive'],
                'methods': ['calculate_total', 'add_item', 'to_dict']
            }
        ]

        files_generated = [
            f'models/__init__.py',
            f'models/user.py',
            f'models/product.py',
            f'models/order.py',
            f'models/category.py',
            f'models/order_item.py'
        ]

        if options.get('add_serializers'):
            files_generated.extend([
                'serializers/__init__.py',
                'serializers/user.py',
                'serializers/product.py',
                'serializers/order.py'
            ])

        if options.get('add_migrations'):
            files_generated.append('migrations/001_initial_models.py')

        return {
            'status': 'success',
            'schema_source': schema_source,
            'orm_framework': orm_framework,
            'language': language,
            'models_generated': models,
            'total_models': len(models),
            'files_generated': files_generated,
            'relationships_mapped': 7,
            'validators_added': 8 if options.get('add_validators') else 0,
            'serializers_added': 3 if options.get('add_serializers') else 0,
            'features': {
                'type_hints': options.get('type_hints', True),
                'relationships': options.get('add_relationships', True),
                'validators': options.get('add_validators', True),
                'serializers': options.get('add_serializers', False),
                'async_support': orm_framework in ['sqlalchemy', 'tortoise'],
                'lazy_loading': True,
                'cascade_deletes': True
            },
            'total_fields': sum(len(m['fields']) for m in models),
            'total_methods': sum(len(m.get('methods', [])) for m in models),
            'next_steps': [
                'Review generated models',
                'Add custom business logic',
                'Create database migrations',
                'Write model tests',
                'Set up database connection'
            ]
        }

    def validate_params(self, params: Dict[str, Any]) -> bool:
        """Validate ORM mapping parameters."""
        if 'schema_source' not in params:
            self.logger.error("Missing required field: schema_source")
            return False

        valid_frameworks = [
            'sqlalchemy', 'django', 'typeorm',
            'sequelize', 'gorm', 'diesel'
        ]
        orm_framework = params.get('orm_framework', 'sqlalchemy')

        if orm_framework not in valid_frameworks:
            self.logger.error(f"Unsupported ORM framework: {orm_framework}")
            return False

        return True
