// SPDX-License-Identifier: MIT
// Klaytn Contract Library v1.0.0 (KIP/token/KIP7/extensions/KIP7Capped.sol)
// Based on OpenZeppelin Contracts v4.5.0 (token/ERC20/extensions/ERC20Capped.sol)
// https://github.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v4.5.0

pragma solidity ^0.8.0;

import "../KIP7.sol";

/**
 * @dev Extension of KIP7 that adds a cap to the supply of tokens.
 */
abstract contract KIP7Capped is KIP7 {
    uint256 private immutable _cap;

    /**
     * @dev Sets the value of the `cap`. This value is immutable, it can only be
     * set once during construction.
     */
    constructor(uint256 cap_) {
        require(cap_ > 0, "KIP7Capped: cap is 0");
        _cap = cap_;
    }

    /**
     * @dev Returns the cap on the token's total supply.
     */
    function cap() public view virtual returns (uint256) {
        return _cap;
    }

    /**
     * @dev See {KIP7-_mint}.
     */
    function _mint(address account, uint256 amount) internal virtual override {
        require(KIP7.totalSupply() + amount <= cap(), "KIP7Capped: cap exceeded");
        super._mint(account, amount);
    }
}