pragma solidity ^0.5.16;

import "../BaseMigration.sol";
import "../AddressResolver.sol";
import "../Proxy.sol";
import "../legacy/LegacyTokenState.sol";
import "../RewardEscrow.sol";
import "../SupplySchedule.sol";
import "../RewardsDistribution.sol";

interface ISynthetixNamedContract {
    // solhint-disable func-name-mixedcase
    function CONTRACT_NAME() external view returns (bytes32);
}

// solhint-disable contract-name-camelcase
contract Migration_Hamal is BaseMigration {
    // https://etherscan.io/address/0xEb3107117FEAd7de89Cd14D463D340A2E6917769;
    address public constant OWNER = 0xEb3107117FEAd7de89Cd14D463D340A2E6917769;

    // ----------------------------
    // EXISTING SYNTHETIX CONTRACTS
    // ----------------------------

    // https://etherscan.io/address/0x823bE81bbF96BEc0e25CA13170F5AaCb5B79ba83
    AddressResolver public constant addressresolver_i = AddressResolver(0x823bE81bbF96BEc0e25CA13170F5AaCb5B79ba83);
    // https://etherscan.io/address/0xC011a73ee8576Fb46F5E1c5751cA3B9Fe0af2a6F
    Proxy public constant proxysynthetix_i = Proxy(0xC011a73ee8576Fb46F5E1c5751cA3B9Fe0af2a6F);
    // https://etherscan.io/address/0x5b1b5fEa1b99D83aD479dF0C222F0492385381dD
    LegacyTokenState public constant tokenstatesynthetix_i = LegacyTokenState(0x5b1b5fEa1b99D83aD479dF0C222F0492385381dD);
    // https://etherscan.io/address/0xb671F2210B1F6621A2607EA63E6B2DC3e2464d1F
    RewardEscrow public constant rewardescrow_i = RewardEscrow(0xb671F2210B1F6621A2607EA63E6B2DC3e2464d1F);
    // https://etherscan.io/address/0x8d203C458d536Fe0F97e9f741bC231EaC8cd91cf
    SupplySchedule public constant supplyschedule_i = SupplySchedule(0x8d203C458d536Fe0F97e9f741bC231EaC8cd91cf);
    // https://etherscan.io/address/0x29C295B046a73Cde593f21f63091B072d407e3F2
    RewardsDistribution public constant rewardsdistribution_i =
        RewardsDistribution(0x29C295B046a73Cde593f21f63091B072d407e3F2);

    // ----------------------------------
    // NEW CONTRACTS DEPLOYED TO BE ADDED
    // ----------------------------------

    // https://etherscan.io/address/0xE95A536cF5C7384FF1ef54819Dc54E03d0FF1979
    address public constant new_Synthetix_contract = 0xE95A536cF5C7384FF1ef54819Dc54E03d0FF1979;
    // https://etherscan.io/address/0x8d203C458d536Fe0F97e9f741bC231EaC8cd91cf
    address public constant new_SupplySchedule_contract = 0x8d203C458d536Fe0F97e9f741bC231EaC8cd91cf;

    constructor() public BaseMigration(OWNER) {}

    function contractsRequiringOwnership() public pure returns (address[] memory contracts) {
        contracts = new address[](6);
        contracts[0] = address(addressresolver_i);
        contracts[1] = address(proxysynthetix_i);
        contracts[2] = address(tokenstatesynthetix_i);
        contracts[3] = address(rewardescrow_i);
        contracts[4] = address(supplyschedule_i);
        contracts[5] = address(rewardsdistribution_i);
    }

    function migrate() external onlyOwner {
        require(
            ISynthetixNamedContract(new_Synthetix_contract).CONTRACT_NAME() == "Synthetix",
            "Invalid contract supplied for Synthetix"
        );
        require(
            ISynthetixNamedContract(new_SupplySchedule_contract).CONTRACT_NAME() == "SupplySchedule",
            "Invalid contract supplied for SupplySchedule"
        );

        // ACCEPT OWNERSHIP for all contracts that require ownership to make changes
        acceptAll();

        // MIGRATION
        // Import all new contracts into the address resolver;
        addressresolver_importAddresses_0();
        // Rebuild the resolver caches in all MixinResolver contracts - batch 1;
        addressresolver_rebuildCaches_1();
        // Ensure the SNX proxy has the correct Synthetix target set;
        proxysynthetix_i.setTarget(Proxyable(new_Synthetix_contract));
        // Ensure the Synthetix contract can write to its TokenState contract;
        tokenstatesynthetix_i.setAssociatedContract(new_Synthetix_contract);
        // Ensure the legacy RewardEscrow contract is connected to the Synthetix contract;
        rewardescrow_i.setSynthetix(ISynthetix(new_Synthetix_contract));
        // Ensure the SupplySchedule is connected to the SNX proxy for reading;
        supplyschedule_i.setSynthetixProxy(ISynthetix(0xC011a73ee8576Fb46F5E1c5751cA3B9Fe0af2a6F));
        // Ensure the RewardsDistribution has Synthetix set as its authority for distribution;
        rewardsdistribution_i.setAuthority(new_Synthetix_contract);

        // NOMINATE OWNERSHIP back to owner for aforementioned contracts
        nominateAll();
    }

    function acceptAll() internal {
        address[] memory contracts = contractsRequiringOwnership();
        for (uint i = 0; i < contracts.length; i++) {
            Owned(contracts[i]).acceptOwnership();
        }
    }

    function nominateAll() internal {
        address[] memory contracts = contractsRequiringOwnership();
        for (uint i = 0; i < contracts.length; i++) {
            returnOwnership(contracts[i]);
        }
    }

    function addressresolver_importAddresses_0() internal {
        bytes32[] memory addressresolver_importAddresses_names_0_0 = new bytes32[](2);
        addressresolver_importAddresses_names_0_0[0] = bytes32("Synthetix");
        addressresolver_importAddresses_names_0_0[1] = bytes32("SupplySchedule");
        address[] memory addressresolver_importAddresses_destinations_0_1 = new address[](2);
        addressresolver_importAddresses_destinations_0_1[0] = address(new_Synthetix_contract);
        addressresolver_importAddresses_destinations_0_1[1] = address(new_SupplySchedule_contract);
        addressresolver_i.importAddresses(
            addressresolver_importAddresses_names_0_0,
            addressresolver_importAddresses_destinations_0_1
        );
    }

    function addressresolver_rebuildCaches_1() internal {
        MixinResolver[] memory addressresolver_rebuildCaches_destinations_1_0 = new MixinResolver[](7);
        addressresolver_rebuildCaches_destinations_1_0[0] = MixinResolver(0xDA4eF8520b1A57D7d63f1E249606D1A459698876);
        addressresolver_rebuildCaches_destinations_1_0[1] = MixinResolver(0xAD95C918af576c82Df740878C3E983CBD175daB6);
        addressresolver_rebuildCaches_destinations_1_0[2] = MixinResolver(0x426Be4cC70066b2C42Edb1aE838c741069b1972c);
        addressresolver_rebuildCaches_destinations_1_0[3] = MixinResolver(0x16e5ACe2B8a9DE5c42fCFd85d6EC5992a43C0837);
        addressresolver_rebuildCaches_destinations_1_0[4] = MixinResolver(0x62922670313bf6b41C580143d1f6C173C5C20019);
        addressresolver_rebuildCaches_destinations_1_0[5] = MixinResolver(0xCd9D4988C0AE61887B075bA77f08cbFAd2b65068);
        addressresolver_rebuildCaches_destinations_1_0[6] = MixinResolver(new_Synthetix_contract);
        addressresolver_i.rebuildCaches(addressresolver_rebuildCaches_destinations_1_0);
    }
}