from ..models import CostFactor
from .. import db
import logging

logger = logging.getLogger(__name__)

# Single source of truth for default cost factors
DEFAULT_COST_FACTORS = [
    # Mold Type Factors
    {'category': 'mold', 'name': 'Flat', 'factor_value': 1.0, 'description': 'Standard flat outsole'},
    {'category': 'mold', 'name': 'Flat with Top/Heel Tip', 'factor_value': 1.25, 'description': 'Flat with additional tip features'},
    {'category': 'mold', 'name': 'Top PL', 'factor_value': 1.05, 'description': 'Top part line mold'},
    {'category': 'mold', 'name': 'Visible PL', 'factor_value': 1.28, 'description': 'Visible part line mold'},
    {'category': 'mold', 'name': 'Short PL (Heel/Forefoot)', 'factor_value': 1.18, 'description': 'Short part line for specific areas'},
    {'category': 'mold', 'name': 'Wave PL', 'factor_value': 1.32, 'description': 'Wave pattern part line'},
    {'category': 'mold', 'name': 'Multi-color PL', 'factor_value': 1.35, 'description': 'Multi-color part line mold'},
    {'category': 'mold', 'name': '2 Plates Mold', 'factor_value': 1.0, 'description': 'Standard 2-plate configuration'},
    {'category': 'mold', 'name': '3 Plates Mold', 'factor_value': 1.35, 'description': 'Complex 3-plate configuration'},
    {'category': 'mold', 'name': '2 Plates with in-mold channel', 'factor_value': 1.25, 'description': '2-plate with channel features'},
    {'category': 'mold', 'name': 'Breathable + in-mold channel', 'factor_value': 1.45, 'description': 'Breathable with channel features'},
    {'category': 'mold', 'name': 'Sandal with Upper Bandage', 'factor_value': 1.15, 'description': 'Sandal with bandage features'},
    {'category': 'mold', 'name': '2 Plate without Upper Bandage', 'factor_value': 1.05, 'description': 'Standard 2-plate sandal'},
    {'category': 'mold', 'name': 'Co-shot mold', 'factor_value': 1.25, 'description': 'Multi-material injection'},
    {'category': 'mold', 'name': 'Foaming mold', 'factor_value': 1.4, 'description': 'Foam injection process'},
    
    # Complexity Factors
    {'category': 'complexity', 'name': 'high_sidewall', 'factor_value': 0.18, 'calculation_formula': 'Base Price × 0.18', 'description': 'Additional cost for high sidewall molds'},
    {'category': 'complexity', 'name': 'slider', 'factor_value': 0.1, 'calculation_formula': 'Base Price × (Number of Sliders × 0.10)', 'description': 'Cost per slider added to mold'},
    {'category': 'complexity', 'name': 'cavity', 'factor_value': 0.12, 'calculation_formula': 'Base Price × ((Number of Cavities - 1) × 0.12)', 'description': 'Cost for additional cavities beyond 1'},
    
    # Texture Factors
    {'category': 'texture', 'name': 'adidas_digital', 'factor_value': 0.0, 'percentage': '0%', 'description': 'No additional cost for standard adidas texture'},
    {'category': 'texture', 'name': 'customized texture', 'factor_value': 0.15, 'percentage': '15%', 'description': '15% of base price for custom texture'},
    {'category': 'texture', 'name': 'laser', 'factor_value': 0.2, 'percentage': '20%', 'description': '20% of base price for laser texture'},
    
    # Tax Rates
    {'category': 'tax', 'name': 'China', 'factor_value': 0.06, 'percentage': '6%', 'description': '6% VAT for China'},
    {'category': 'tax', 'name': 'Vietnam', 'factor_value': 0.10, 'percentage': '10%', 'description': '10% VAT for Vietnam'},
    {'category': 'tax', 'name': 'Indonesia', 'factor_value': 0.07, 'percentage': '7%', 'description': '7% VAT for Indonesia'},
    
    # Base Price
    {'category': 'base', 'name': 'DEFAULT_NET_BASE', 'factor_value': 12.5, 'description': 'Default base price for calculations'}
]

def load_cost_factors_from_db():
    """
    Load cost factors from database and return them in the same format as constants.
    Falls back to hardcoded values if database is not available.
    """
    try:
        # Get all active cost factors
        factors = CostFactor.query.filter_by(is_active=True).all()
        
        if not factors:
            logger.warning("No cost factors found in database, using hardcoded defaults")
            return get_default_cost_factors()
        
        # Build the cost factors structure
        cost_factors = {
            'mold': {},
            'complexity': {},
            'texture': {}
        }
        
        tax_rates = {}
        default_net_base = 12.5  # Default value
        
        for factor in factors:
            if factor.category == 'mold':
                cost_factors['mold'][factor.name] = factor.factor_value
            elif factor.category == 'complexity':
                cost_factors['complexity'][factor.name] = factor.factor_value
            elif factor.category == 'texture':
                cost_factors['texture'][factor.name] = factor.factor_value
            elif factor.category == 'tax':
                tax_rates[factor.name] = factor.factor_value
            elif factor.category == 'base':
                default_net_base = factor.factor_value
        
        logger.info(f"Loaded {len(factors)} cost factors from database")
        return cost_factors, tax_rates, default_net_base
        
    except Exception as e:
        logger.error(f"Error loading cost factors from database: {str(e)}")
        logger.info("Falling back to hardcoded cost factors")
        return get_default_cost_factors()

def get_default_cost_factors():
    """Return hardcoded cost factors as fallback - derived from single source of truth"""
    cost_factors = {
        'mold': {},
        'complexity': {},
        'texture': {}
    }
    
    tax_rates = {}
    default_net_base = 12.5
    
    # Build the structure from the single source of truth
    for factor_data in DEFAULT_COST_FACTORS:
        category = factor_data['category']
        name = factor_data['name']
        value = factor_data['factor_value']
        
        if category == 'mold':
            cost_factors['mold'][name] = value
        elif category == 'complexity':
            cost_factors['complexity'][name] = value
        elif category == 'texture':
            cost_factors['texture'][name] = value
        elif category == 'tax':
            tax_rates[name] = value
        elif category == 'base':
            default_net_base = value
    
    return cost_factors, tax_rates, default_net_base

def get_cost_factors():
    """Get current cost factors (from database or defaults)"""
    return load_cost_factors_from_db()

def initialize_default_cost_factors():
    """Initialize the database with default cost factors if none exist"""
    try:
        if CostFactor.query.count() == 0:
            logger.info("Initializing database with default cost factors")
            
            # Use the single source of truth
            for factor_data in DEFAULT_COST_FACTORS:
                factor = CostFactor(**factor_data)
                db.session.add(factor)
            
            db.session.commit()
            logger.info(f"Initialized {len(DEFAULT_COST_FACTORS)} default cost factors")
            
    except Exception as e:
        logger.error(f"Error initializing default cost factors: {str(e)}")
        db.session.rollback()
        raise