Shopify Scripts

1. 买指定商品，享受所有配件八折，其中，部分配件仅允许享受一次八折优惠

   SPECIFIC_VID = 28785311875136
   UNLIMIT_DISCOUNT_PIDS = [3742304010304, 3733881094208]
   LIMIT_ONCE_DISCOUNT_PIDS = [3742295982144]
   
   def partition(cart, line_items)
       # Sort the items by price from high to low
       sorted_items = line_items.sort_by{|line_item| line_item.variant.price}.reverse
       # Create an array of items to return
       discount_items = []
   
       sorted_items.each do |line_item|
           if LIMIT_ONCE_DISCOUNT_PIDS.include?(line_item.variant.product.id) && line_item.quantity > 1
               discount_item = line_item.split(take: 1)
   
               cart.line_items << discount_item
   
               discount_items.push(discount_item)
           else
               discount_items.push(line_item)
           end
       end
   
       discount_items
   end
   
   Input.cart.line_items.each do |line_item|
       next unless line_item.variant.id == SPECIFIC_VID
       eligible_items = Input.cart.line_items.select do |line_item|
           product = line_item.variant.product
           UNLIMIT_DISCOUNT_PIDS.include?(product.id) || LIMIT_ONCE_DISCOUNT_PIDS.include?(product.id)
       end
   
       discount_line_items = partition(Input.cart, eligible_items)
       discount_line_items.each do |line_item|
           line_item.change_line_price(line_item.line_price * 0.80, message: "Hiahiahia")
       end
   end
       
   Output.cart = Input.cart
   

2. 满足条件则Standard免邮

   flag = false
   if Input.cart.subtotal_price >= Money.new(cents: 5000)
     flag = true
   end
       
   fs_product_ids = [3852672368704, 3852680659008]
   Input.cart.line_items.each do |line_item|
     next unless fs_product_ids.include?(line_item.variant.product.id)
     flag = true
   end
       
   if flag
     Input.shipping_rates.each do |shipping_rate|
       next unless shipping_rate.name == "Standard"
       shipping_rate.apply_discount((shipping_rate.price * 1), message: "Free shipping")
     end
       
     Output.shipping_rates = Input.shipping_rates
   else 
     Output.shipping_rates = Input.shipping_rates
   end
   

3. 复杂优惠组合：第二个半价，达到数量赠送部分，达到金额赠送礼品

   #Part1, Kit Second Half Price
   num=0
   Input.cart.line_items.each do |line_item|
       next unless line_item.variant.product.id==1869754073152
       if(line_item.quantity >= 2) then
           dnum=(line_item.quantity).div(2)
           line_item.change_line_price(line_item.line_price - line_item.variant.price * 0.5 * dnum, message: "Kit Second Half Price")
           num=line_item.quantity % 2
       else
           num+=line_item.quantity
           next unless num==2
           line_item.change_line_price(line_item.line_price * 0.5, message: "Kit Second Half Price")
           num=0
       end
   end
       
       
   #Part2, Pods Buy 10 Get 2 Free
   PAID_ITEM_COUNT = 10
   DISCOUNTED_ITEM_COUNT = 2
       
   def discounted_items_to_find(total_items_seen, discounted_items_seen)
     Integer(total_items_seen / (PAID_ITEM_COUNT + DISCOUNTED_ITEM_COUNT) * DISCOUNTED_ITEM_COUNT) - discounted_items_seen
   end
       
   def partition(cart, line_items)
     sorted_items = line_items.sort_by{|line_item| line_item.variant.price}.reverse
     discounted_items = []
     total_items_seen = 0
     discounted_items_seen = 0
       
     sorted_items.each do |line_item|
       total_items_seen += line_item.quantity
       count = discounted_items_to_find(total_items_seen, discounted_items_seen)
       next if count <= 0
       
       if count >= line_item.quantity
         discounted_items.push(line_item)
         discounted_items_seen += line_item.quantity
       else
         discounted_item = line_item.split(take: count)
         position = cart.line_items.find_index(line_item)
         cart.line_items.insert(position + 1, discounted_item)
         discounted_items.push(discounted_item)
         discounted_items_seen += discounted_item.quantity
       end
     end
       
     discounted_items
   end
       
   eligible_items = Input.cart.line_items.select do |line_item|
     product = line_item.variant.product
     !product.gift_card? && product.id == 1880855576640
   end
       
   discounted_line_items = partition(Input.cart, eligible_items)
   discounted_line_items.each do |line_item|
     line_item.change_line_price(Money.zero, message: "RelxPods Buy 10 Get 2 Free")
   end
       
       
   #Part3, Purchase Over 199 Get Gift
   FREE_GIFT_PRODUCT_ID = 4168668315712
   if Input.cart.subtotal_price >= Money.new(cents: 19900)
     Input.cart.line_items.each do |line_item|
       if line_item.variant.product.id == FREE_GIFT_PRODUCT_ID
         if line_item.quantity > 1
           line_item = line_item.split(take: 1)
           Input.cart.line_items << line_item
         end
         line_item.change_line_price(Money.zero, message: "Free Gift With Purchase Over 199")
       end
     end
   end
       
       
   Output.cart = Input.cart