gem 'myco_pricing_engine'

require "ostruct"

# Example user (ActiveRecord model or OpenStruct with `loyalty_points`)
user = OpenStruct.new(loyalty_points: 1200)

# Optional configuration
config = {
  loyalty_levels: {
    silver:   { threshold: 500,  discount: 0.05 },
    gold:     { threshold: 1000, discount: 0.10 },
    platinum: { threshold: 2000, discount: 0.20 }
  },
  tax_rate: 0.18,                       # 18% tax
  coupons: {                             # Coupons can stack
    "SAVE50" => 50,                      # Fixed discount
    "NEW10"  => 0.10                     # Percentage discount
  },
  early_bird_deadline: Time.current + 1.hour, # Early bird active for 1 hour
  early_bird_discount: 0.05,              # 5% early bird
  delivery_fee: 20.0,                     # Delivery fee
  min_price: 0.0,
  max_price: 2000.0                       # Price cap
}

# --- Options (Coupons applied) ---
options = {
  coupons: ["SAVE50", "NEW10"] # Multiple coupons
}

# --- Initialize Calculator ---
calc = MycoPricingEngine::Calculator.new(
  base_price: 1000,
  user: user,
  options: options,
  config: config
)

# --- Calculate final price ---
final_price = calc.final_price
puts "Final Price: #{final_price}"

# --- Step-by-step calculation ---
# Base Price: 1000
# Loyalty Discount (gold 10%): 100
# Price after loyalty: 900
# Early Bird Discount (5%): 45
# Price after early bird: 855
# Tax (18%): 153.9
# Price after tax: 1008.9
# Coupons:
#   SAVE50 (fixed) = 50
#   NEW10 (percentage) = 1008.9 * 0.10 = 100.89
# Total coupon discount = 150.89
# Price after coupons: 858.01
# Delivery Fee: +20 = 878.01
# Caps applied: min 0, max 2000 → no change
# Final Price: 878.01 ✅