// File: lib/openzeppelin-contracts/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.19;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.19;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

// File: lib/openzeppelin-contracts/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.19;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File: src/TeddyPresale.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin-contracts/access/Ownable.sol";
import "@openzeppelin-contracts/token/ERC20/IERC20.sol";

contract TeddyPresale is Ownable {
    IERC20 public token;

    uint256 public supply;

    uint256 public constant MIN_AMOUNT = 0.05 ether;

    uint256 public constant MAX_AMOUNT = 1.5 ether;

    uint256 public totalSales;

    struct Buyer {
        address addr;
        uint256 amount;
        bool claimed;
    }

    mapping(uint256 => Buyer) public buyer;

    mapping(address => uint256) public buyerIndex;

    uint256 public totalBuyers;

    bool public claimOpen;

    uint256 public capacity = 5 ether;

    constructor() Ownable(msg.sender) {}

    function buy() public payable {
        _presaleBuy();
    }

    receive() external payable {
        _presaleBuy();
    }

    function _presaleBuy() private whileNotClaiming {
        require(msg.value >= MIN_AMOUNT, "Below ETH Minimum");
        totalSales += msg.value;
        require(totalSales <= capacity, "Above Cap");
        uint256 index = buyerIndex[msg.sender];
        if (index == 0) {
            index = ++totalBuyers;
        }
        uint256 total = buyer[index].amount;
        require(msg.value + total <= MAX_AMOUNT, "Above ETH Maximum");
        buyerIndex[msg.sender] = index;
        buyer[index].addr = msg.sender;
        buyer[index].amount += msg.value;
    }

    function claim() public payable {
        require(claimOpen, "Claim not open");
        uint256 index = buyerIndex[msg.sender];
        if (index != 0 && address(token) != address(0) && supply != 0) {
            uint256 tokenPrice = (totalSales * 10e18) / supply;
            uint256 amount = buyer[index].amount * 10e18;
            uint256 numTokens = amount / tokenPrice;
            require(!buyer[index].claimed, "Already claimed");
            buyer[index].claimed = true;
            token.transfer(buyer[index].addr, numTokens);
        }
    }

    function _refund(uint256 a, uint256 b) private {
        require(a > 0);
        for (uint256 i = a; i <= b; i++) {
            address payable refunding = payable(buyer[i].addr);
            refunding.transfer(buyer[i].amount);
        }
    }

    function refund() external onlyOwner {
        _refund(1, totalBuyers);
    }

    function refund(uint256 from, uint256 to) external onlyOwner {
        require(from > 0);
        _refund(from, to);
    }

    function withdraw() public onlyOwner {
        (bool success, ) = payable(owner()).call{value: address(this).balance}(
            ""
        );
        require(success, "Withdraw Failed");
    }

    function withdrawERC20() public onlyOwner {
        token.transfer(owner(), token.balanceOf(address(this)));
    }

    function updateToken(IERC20 token_, uint256 supply_) public onlyOwner {
        token = token_;
        supply = supply_;
    }

    function toggleClaim() public onlyOwner {
        claimOpen = !claimOpen;
    }

    function setCap(uint256 cap) public onlyOwner {
        require(cap <= 20 ether);
        capacity = cap;
    }

    modifier whileNotClaiming() {
        if (claimOpen) {
            return;
        }
        _;
    }
}