// SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity >=0.8.0;

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// ============ Internal Imports ============
import {StandardHookMetadata} from "../libs/StandardHookMetadata.sol";
import {Message} from "../../libs/Message.sol";
import {TypeCasts} from "../../libs/TypeCasts.sol";
import {AbstractPostDispatchHook} from "../libs/AbstractPostDispatchHook.sol";
import {IPostDispatchHook} from "../../interfaces/hooks/IPostDispatchHook.sol";
import {MetaProxy} from "../../libs/MetaProxy.sol";

// ============ External Imports ============
import {Address} from "@openzeppelin/contracts/utils/Address.sol";

contract StaticAggregationHook is AbstractPostDispatchHook {
    using Message for bytes;
    using TypeCasts for bytes32;
    using StandardHookMetadata for bytes;
    using Address for address payable;

    // ============ External functions ============

    /// @inheritdoc IPostDispatchHook
    function hookType() external pure override returns (uint8) {
        return uint8(IPostDispatchHook.HookTypes.AGGREGATION);
    }

    /// @inheritdoc AbstractPostDispatchHook
    /// @dev When metadata specifies a non-zero feeToken, native value is NOT
    /// forwarded to children. Each child that supports ERC20 fees is responsible
    /// for pulling tokens via transferFrom in its own _postDispatch. Any native
    /// value received is refunded to the refund address.
    function _postDispatch(
        bytes calldata metadata,
        bytes calldata message
    ) internal override {
        address[] memory _hooks = hooks(message);
        uint256 count = _hooks.length;
        bool isNativeFee = metadata.feeToken(address(0)) == address(0);
        uint256 valueRemaining = msg.value;
        for (uint256 i = 0; i < count; i++) {
            uint256 quote = isNativeFee
                ? IPostDispatchHook(_hooks[i]).quoteDispatch(metadata, message)
                : 0;
            require(
                valueRemaining >= quote,
                "StaticAggregationHook: insufficient value"
            );

            IPostDispatchHook(_hooks[i]).postDispatch{value: quote}(
                metadata,
                message
            );

            valueRemaining -= quote;
        }

        if (valueRemaining > 0) {
            payable(metadata.refundAddress(message.senderAddress())).sendValue(
                valueRemaining
            );
        }
    }

    /// @inheritdoc AbstractPostDispatchHook
    function _quoteDispatch(
        bytes calldata metadata,
        bytes calldata message
    ) internal view override returns (uint256) {
        address[] memory _hooks = hooks(message);
        uint256 count = _hooks.length;
        uint256 total = 0;
        for (uint256 i = 0; i < count; i++) {
            total += IPostDispatchHook(_hooks[i]).quoteDispatch(
                metadata,
                message
            );
        }
        return total;
    }

    function hooks(bytes calldata) public pure returns (address[] memory) {
        return abi.decode(MetaProxy.metadata(), (address[]));
    }
}