/// ProxyRegistry.sol

// Copyright (C) 2018-2019 Gonzalo Balabasquer <gbalabasquer@gmail.com>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

pragma solidity >=0.5.0;

import 'ds-proxy/proxy.sol';

// This Registry deploys new proxy instances through DSProxyFactory.build(address) and keeps a registry of owner => proxy
contract ProxyRegistry {
    mapping(address => DSProxy) public proxies;
    DSProxyFactory factory;

    constructor(address factory_) public {
        factory = DSProxyFactory(factory_);
    }

    // deploys a new proxy instance
    // sets owner of proxy to caller
    function build() public returns (address payable proxy) {
        proxy = build(msg.sender);
    }

    // deploys a new proxy instance
    // sets custom owner of proxy
    function build(address owner) public returns (address payable proxy) {
        require(proxies[owner] == DSProxy(0) || proxies[owner].owner() != owner); // Not allow new proxy if the user already has one and remains being the owner
        proxy = factory.build(owner);
        proxies[owner] = DSProxy(proxy);
    }
}