MOD: gptminer inscription nft collection

contracts/gptmining/GPTMinerInscription.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.20;
+pragma solidity >=0.8.2 <0.9.0;
 
 import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
 import "@openzeppelin/contracts/access/Ownable.sol";
@@ -19,32 +19,83 @@ contract GPTMinerInscription is ERC721, Ownable {
         tokenIdToAmount[tokenId] = amount;
     }
 
+    function split(uint256 tokenId, uint256 amount) external {
+        require(_ownerOf(tokenId) == msg.sender, "Not token owner");
+        require(tokenIdToAmount[tokenId] > amount, "Amount exceeds");
+        uint256 newTokenId = _nextTokenId++;
+        tokenIdToAmount[tokenId] -= amount;
+        _safeMint(msg.sender, newTokenId);
+        tokenIdToAmount[newTokenId] = amount;
+    }
+
     function tokenURI(
         uint256 tokenId
     ) public view virtual override returns (string memory) {
         _requireOwned(tokenId);
 
-        bytes memory dataURI = abi.encodePacked(
-            "{",
-            '"name": "GPTMinerInscription #',
-            tokenId.toString(),
-            '",',
-            '"description":"World\'s first token inscribed by GPT.",',
-            '"attributes":[',
-            '{',
-                '"trait_type":"Amount",',
-                '"value":"', (tokenIdToAmount[tokenId]).toString(), '"',
-            '}',
-            "]",
-            "}"
+        string[13] memory parts;
+        string memory amount = (tokenIdToAmount[tokenId]).toString();
+
+        parts[
+            0
+        ] = '<svg xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMinYMin meet" viewBox="0 0 180 180"><style>.base { fill: white; font-family: serif; font-size: 14px; }</style><rect width="100%" height="100%" fill="black" /><text x="10" y="20" class="base">';
+
+        parts[1] = "{";
+
+        parts[2] = '</text><text x="30" y="40" class="base">';
+
+        parts[3] = '"p": "gpt20"';
+
+        parts[4] = '</text><text x="30" y="60" class="base">';
+
+        parts[5] = '"op": "mint"';
+
+        parts[6] = '</text><text x="30" y="80" class="base">';
+
+        parts[7] = '"tick": "gpt"';
+
+        parts[8] = '</text><text x="30" y="100" class="base">"amount": "';
+
+        parts[9] = amount;
+
+        parts[10] = '"</text><text x="10" y="120" class="base">';
+
+        parts[11] = '}';
+
+        parts[12] = "</text></svg>";
+
+        string memory output = string(
+            abi.encodePacked(
+                parts[0],
+                parts[1],
+                parts[2],
+                parts[3],
+                parts[4],
+                parts[5],
+                parts[6],
+                parts[7],
+                parts[8]
+            )
         );
+        output = string(abi.encodePacked(output, parts[9], parts[10], parts[11], parts[12]));
 
-        return
-            string(
-                abi.encodePacked(
-                    "data:application/json;base64,",
-                    Base64.encode(dataURI)
+        string memory json = Base64.encode(
+            bytes(
+                string(
+                    abi.encodePacked(
+                        '{"name": "GPTMiner Inscription #',
+                        tokenId.toString(),
+                        '", "description": "World\'s first token inscribed by GPT.", "image": "data:image/svg+xml;base64,',
+                        Base64.encode(bytes(output)),
+                        '"}'
+                    )
                 )
-            );
+            )
+        );
+        output = string(
+            abi.encodePacked("data:application/json;base64,", json)
+        );
+
+        return output;
     }
 }