From 54e6c5ac3944371a247a5199df82ce4daa3c1c2f Mon Sep 17 00:00:00 2001
From: 1948810 <scifoni.1948810@studenti.uniroma1.it>
Date: Fri, 5 Jan 2024 15:33:27 +0100
Subject: [PATCH] add buy ether with Geth

---
 smart_contract/Geth.sol | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/smart_contract/Geth.sol b/smart_contract/Geth.sol
index 7d47386..9b696a8 100644
--- a/smart_contract/Geth.sol
+++ b/smart_contract/Geth.sol
@@ -36,6 +36,17 @@ contract Geth is ERC20, Ownable {
         _mint(msg.sender, tokenAmount);
     }
 
+    /**
+     * @dev function to buy Ether with tokens and transfer them to the buyer.
+     */
+    function purchaseWei(uint256 tokenAmount) external {
+        uint256 WeiAmount = calculateWeiAmount(tokenAmount);
+
+
+        // Trasferisci i token all'acquirente
+        payable(msg.sender).transfer(WeiAmount);
+    }
+
     /**
      * @dev function to calculate the amount of tokens to be transferred to the buyer.
      * Returns the amount of tokens that can be purchased with the sent amount of Ether.
@@ -44,6 +55,14 @@ contract Geth is ERC20, Ownable {
         return weiAmount / GETH_TO_WEI;
     }
 
+    /**
+     * @dev function to calculate the amount of wei to be transferred to the buyer.
+     * Returns the amount of wei that can be purchased with the sent amount of Geth.
+     */
+    function calculateWeiAmount(uint256 tokenAmount) private pure returns (uint256) {
+        return GETH_TO_WEI * tokenAmount;
+    }
+
     /**
      * @dev function to set the {operator} smart contract address.
      * Notice this function can be called only by the contract owner.
@@ -66,4 +85,5 @@ contract Geth is ERC20, Ownable {
         }
         return super.allowance(owner, spender);
     }
+
 }
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