493054 developing module for conditional cart discount on prestasho

hi i want an offer for developing module for conditional cart discount on prestashop 1.4 these are the features i need: 1. buy #A get #B free / % discount / $ discount (the discounted have to be the cheaper one). #A: can be a quantity of products that answer all conditions or a specific product. #B: can be a quantity of products that answer all conditions or a specific product. example: -buy 3 get 1 free(the discounted have to be the cheaper one). -buy 2 get 2 with 20% discount(the discounted have to be the cheaper one). -buy 2 get 2 with 20$ discount. -buy 2 get specific product with 20$/20% discount. 2. for minimum total price of products that answer all conditions: -% discount. -$ discount. -%/$ discount for specific product if exist in cart. -add specific product free to cart. 3. condition according to: -categories (choose the product to be discounted). -features (choose features. products with that features will be discounted). -manufactor. -costumer group. -gender. -product discounted or not. 4. on cart view list the optional discount for this cart. -in the list, a discount of "%/$ discount for specific product" will have a link to add that product to the cart. -on product page & category view, mark the product on sale. -on product page view, list the discounts this product can participate in.