23 lines
990 B
Plaintext
23 lines
990 B
Plaintext
type taco_supply is record
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current_stock : nat;
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max_price : tez;
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end
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type taco_shop_storage is map(nat, taco_supply);
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function buy_taco (const taco_kind_index: nat ; var taco_shop_storage : taco_shop_storage) : (list(operation) * taco_shop_storage) is
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begin
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// Retrieve the taco_kind from the contract's storage
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const taco_kind : taco_supply = get_force(taco_kind_index, taco_shop_storage);
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const current_purchase_price : tez = taco_kind.max_price / taco_kind.current_stock;
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if amount =/= current_purchase_price then
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// we won't sell tacos if the amount isn't correct
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fail("Sorry, the taco you're trying to purchase has a different price");
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else
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// Decrease the stock by 1n, because we've just sold one
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taco_kind.current_stock := abs(taco_kind.current_stock - 1n);
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// Update the storage with the refreshed taco_kind
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taco_shop_storage[taco_kind_index] := taco_kind;
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end with ((nil : list(operation)), taco_shop_storage) |