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// SPDX-License-Identifier: GPL-3.0

/// @title The NounsToken pseudo-random seed generator

/*********************************
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 *********************************/

pragma solidity ^0.8.6;

import { INounsSeeder } from './interfaces/INounsSeeder.sol';
import { INounsDescriptor } from './interfaces/INounsDescriptor.sol';

contract NounsSeeder is INounsSeeder {
    /**
     * @notice Generate a pseudo-random Noun seed using the previous blockhash and noun ID.
     */
    // prettier-ignore
    function generateSeed(uint256 nounId, INounsDescriptor descriptor) external view override returns (Seed memory) {

        Seed memory seed = descriptor.lookupCustomSeed(nounId);

        if (seed.head != 0) {
            return seed;
        }

        uint256 pseudorandomness = uint256(
            keccak256(abi.encodePacked(blockhash(block.number - 1), nounId))
        );

        uint256 offset = descriptor.customCount();
        uint256 backgroundCount = descriptor.backgroundCount() - offset;
        uint256 bodyCount = descriptor.bodyCount() - offset;
        uint256 accessoryCount = descriptor.accessoryCount() - offset;
        uint256 headCount = descriptor.headCount() - offset;
        uint256 glassesCount = descriptor.glassesCount() - offset;

        return Seed({
            background: uint48(
                uint48(pseudorandomness) % backgroundCount
            ),
            body: uint48(
                uint48(pseudorandomness >> 48) % bodyCount
            ),
            accessory: uint48(
                uint48(pseudorandomness >> 96) % accessoryCount
            ),
            head: uint48(
                uint48(pseudorandomness >> 144) % headCount
            ),
            glasses: uint48(
                uint48(pseudorandomness >> 192) % glassesCount
            )
        });
    }
}

// SPDX-License-Identifier: GPL-3.0

/// @title Interface for NounsSeeder

/*********************************
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 *********************************/

pragma solidity ^0.8.6;

import { INounsDescriptor } from './INounsDescriptor.sol';

interface INounsSeeder {
    struct Seed {
        uint48 background;
        uint48 body;
        uint48 accessory;
        uint48 head;
        uint48 glasses;
    }

    function generateSeed(uint256 nounId, INounsDescriptor descriptor) external view returns (Seed memory);
}

// SPDX-License-Identifier: GPL-3.0

/// @title Interface for NounsDescriptor

/*********************************
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 *********************************/

pragma solidity ^0.8.6;

import { INounsSeeder } from './INounsSeeder.sol';

interface INounsDescriptor {
    event PartsLocked();

    event DataURIToggled(bool enabled);

    event BaseURIUpdated(string baseURI);

    function arePartsLocked() external returns (bool);

    function isDataURIEnabled() external returns (bool);

    function baseURI() external returns (string memory);

    function palettes(uint8 paletteIndex, uint256 colorIndex) external view returns (string memory);

    function backgrounds(uint256 index) external view returns (string memory);

    function bodies(uint256 index) external view returns (bytes memory);

    function accessories(uint256 index) external view returns (bytes memory);

    function heads(uint256 index) external view returns (bytes memory);

    function glasses(uint256 index) external view returns (bytes memory);

    function customCount() external view returns (uint256);

    function backgroundCount() external view returns (uint256);

    function bodyCount() external view returns (uint256);

    function accessoryCount() external view returns (uint256);

    function headCount() external view returns (uint256);

    function glassesCount() external view returns (uint256);

    function addManyColorsToPalette(uint8 paletteIndex, string[] calldata newColors) external;

    function addManyBackgrounds(string[] calldata backgrounds) external;

    function addManyBodies(bytes[] calldata bodies) external;

    function addManyAccessories(bytes[] calldata accessories) external;

    function addManyHeads(bytes[] calldata heads) external;

    function addManyGlasses(bytes[] calldata glasses) external;

    function addColorToPalette(uint8 paletteIndex, string calldata color) external;

    function addBackground(string calldata background) external;

    function addBody(bytes calldata body) external;

    function addAccessory(bytes calldata accessory) external;

    function addHead(bytes calldata head) external;

    function addCustomSeed(uint256 nounId, INounsSeeder.Seed memory seed) external;

    function addGlasses(bytes calldata glasses) external;

    function lockParts() external;

    function toggleDataURIEnabled() external;

    function setBaseURI(string calldata baseURI) external;

    function tokenURI(uint256 tokenId, INounsSeeder.Seed memory seed) external view returns (string memory);

    function dataURI(uint256 tokenId, INounsSeeder.Seed memory seed) external view returns (string memory);

    function genericDataURI(
        string calldata name,
        string calldata description,
        INounsSeeder.Seed memory seed
    ) external view returns (string memory);

    function generateSVGImage(INounsSeeder.Seed memory seed) external view returns (string memory);

    function lookupCustomSeed(uint256 nounId) external view returns (INounsSeeder.Seed memory);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[{"internalType":"uint256","name":"nounId","type":"uint256"},{"internalType":"contract INounsDescriptor","name":"descriptor","type":"address"}],"name":"generateSeed","outputs":[{"components":[{"internalType":"uint48","name":"background","type":"uint48"},{"internalType":"uint48","name":"body","type":"uint48"},{"internalType":"uint48","name":"accessory","type":"uint48"},{"internalType":"uint48","name":"head","type":"uint48"},{"internalType":"uint48","name":"glasses","type":"uint48"}],"internalType":"struct INounsSeeder.Seed","name":"","type":"tuple"}],"stateMutability":"view","type":"function"}]

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