// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0;

contract KVStore {
    uint private constant MAX_STRING_LENGTH = 1000;
    uint private constant BULK_MAX_COUNT = 20;
    mapping(address => mapping(string => string)) private store;

    event DataSaved(address indexed sender, string key, string value);

    function get(
        address _account,
        string memory _key
    ) public view returns (string memory) {
        return store[_account][_key];
    }

    function set(string memory _key, string memory _value) public {
        require(
            bytes(_key).length <= MAX_STRING_LENGTH &&
                bytes(_value).length <= MAX_STRING_LENGTH,
            'Maximum string length'
        );
        store[msg.sender][_key] = _value;
        emit DataSaved(msg.sender, _key, _value);
    }

    function setBulk(string[] memory _keys, string[] memory _values) public {
        require(
            _keys.length == _values.length,
            'Keys and values must have the same length'
        );
        require(_keys.length < BULK_MAX_COUNT, 'Too many entries');

        for (uint i = 0; i < _keys.length; i++) {
            set(_keys[i], _values[i]);
        }
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"string","name":"key","type":"string"},{"indexed":false,"internalType":"string","name":"value","type":"string"}],"name":"DataSaved","type":"event"},{"inputs":[{"internalType":"address","name":"_account","type":"address"},{"internalType":"string","name":"_key","type":"string"}],"name":"get","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"_key","type":"string"},{"internalType":"string","name":"_value","type":"string"}],"name":"set","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string[]","name":"_keys","type":"string[]"},{"internalType":"string[]","name":"_values","type":"string[]"}],"name":"setBulk","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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