mechanisms/evm

const (
	// Scheme identifiers
	SchemeExact   = "exact"
	SchemeUpto    = "upto"
	SchemeBatched = "batch-settlement"

	// Default token decimals for USDC
	DefaultDecimals = 6

	// EIP-3009 function names
	FunctionTransferWithAuthorization = "transferWithAuthorization"
	FunctionReceiveWithAuthorization  = "receiveWithAuthorization"
	FunctionAuthorizationState        = "authorizationState"
	FunctionTryAggregate              = "tryAggregate"

	// Permit2 function names
	FunctionSettle           = "settle"
	FunctionSettleWithPermit = "settleWithPermit"

	// Transaction status
	TxStatusSuccess = 1
	TxStatusFailed  = 0

	// Default validity period (1 hour)
	DefaultValidityPeriod = 3600 // seconds

	// ERC-6492 magic value (last 32 bytes of wrapped signature)
	// This is bytes32(uint256(keccak256("erc6492.invalid.signature")) - 1)
	ERC6492MagicValue = "0x6492649264926492649264926492649264926492649264926492649264926492"

	// EIP-1271 magic value (returned by isValidSignature on success)
	EIP1271MagicValue = "0x1626ba7e"

	// Shared error constants (used by verify_universal.go and other shared utilities)
	ErrUndeployedSmartWallet = "invalid_exact_evm_payload_undeployed_smart_wallet"

	// Permit2 constants
	// PERMIT2Address is the canonical Uniswap Permit2 contract address.
	// Same address on all EVM chains via CREATE2 deployment.
	PERMIT2Address = "0x000000000022D473030F116dDEE9F6B43aC78BA3"

	// MULTICALL3Address is the canonical Multicall3 deployment address.
	// Same address on all EVM chains via CREATE2 deployment.
	MULTICALL3Address = "0xcA11bde05977b3631167028862bE2a173976CA11"

	// X402ExactPermit2ProxyAddress is the x402 exact payment proxy.
	// Vanity address: 0x4020...0001 for easy recognition.
	X402ExactPermit2ProxyAddress = "0x402085c248EeA27D92E8b30b2C58ed07f9E20001"

	// X402UptoPermit2ProxyAddress is the x402 upto payment proxy.
	// Vanity address: 0x4020...0002 for easy recognition.
	X402UptoPermit2ProxyAddress = "0x4020A4f3b7b90ccA423B9fabCc0CE57C6C240002"

	// Permit2DeadlineBuffer is the time buffer (in seconds) added when checking
	// deadline expiration to account for block propagation time.
	Permit2DeadlineBuffer = 6

	// ERC20ApproveGasLimit is the gas limit for a standard ERC-20 approve() transaction.
	ERC20ApproveGasLimit = 70000

	// DefaultMaxFeePerGas is the fallback max fee per gas (1 gwei) for gas cost estimation.
	DefaultMaxFeePerGas = 1_000_000_000
)

const (
	// Verification errors
	ErrPermit2InvalidSpender    = "invalid_permit2_spender"
	ErrPermit2RecipientMismatch = "invalid_permit2_recipient_mismatch"
	ErrPermit2DeadlineExpired   = "permit2_deadline_expired"
	ErrPermit2NotYetValid       = "permit2_not_yet_valid"
	ErrPermit2AmountMismatch    = "permit2_amount_mismatch"
	ErrPermit2TokenMismatch     = "permit2_token_mismatch"
	ErrPermit2InvalidSignature  = "invalid_permit2_signature"
	ErrPermit2AllowanceRequired = "permit2_allowance_required"

	// Settle errors (from contract reverts)
	ErrPermit2InvalidAmount      = "permit2_invalid_amount"
	ErrPermit2InvalidDestination = "permit2_invalid_destination"
	ErrPermit2InvalidOwner       = "permit2_invalid_owner"
	ErrPermit2PaymentTooEarly    = "permit2_payment_too_early"
	ErrPermit2InvalidNonce       = "permit2_invalid_nonce"
	ErrPermit2612AmountMismatch  = "permit2_2612_amount_mismatch"

	// Simulation errors
	ErrPermit2SimulationFailed    = "permit2_simulation_failed"
	ErrPermit2InsufficientBalance = "permit2_insufficient_balance"
	ErrPermit2ProxyNotDeployed    = "permit2_proxy_not_deployed"

	// ERC-20 approval gas-sponsoring errors
	ErrErc20ApprovalInsufficientEth = "erc20_approval_insufficient_eth_for_gas"
	ErrErc20ApprovalBroadcastFailed = "erc20_approval_broadcast_failed"
)

const BuilderCodeKey = "builder-code"

const (
	// ErrAssetNotDeployedContract is returned when the payment asset address has no bytecode.
	// EOAs return empty data on any eth_call without reverting, causing silent no-op settlements.
	ErrAssetNotDeployedContract = "asset_not_deployed_contract"
)

const (
	// AssetTransferMethodEIP3009 uses EIP-3009 transferWithAuthorization
	AssetTransferMethodEIP3009 AssetTransferMethod = "eip3009"
	// AssetTransferMethodPermit2 uses Permit2 + x402Permit2Proxy
	AssetTransferMethodPermit2 AssetTransferMethod = "permit2"
)

var (
	// Network chain IDs
	ChainIDBase          = big.NewInt(8453)
	ChainIDBaseSepolia   = big.NewInt(84532)
	ChainIDMegaETH       = big.NewInt(4326)
	ChainIDMonad         = big.NewInt(143)
	ChainIDMezo          = big.NewInt(31612)
	ChainIDMezoTestnet   = big.NewInt(31611)
	ChainIDStable        = big.NewInt(988)
	ChainIDStableTestnet = big.NewInt(2201)
	ChainIDPolygon       = big.NewInt(137)
	ChainIDArbOne        = big.NewInt(42161)
	ChainIDArbSepolia    = big.NewInt(421614)
	ChainIDRadius        = big.NewInt(723487)
	ChainIDRadiusTestnet = big.NewInt(72344)
	ChainIDADI           = big.NewInt(36900)
	ChainIDHPP           = big.NewInt(190415)
	ChainIDHPPSepolia    = big.NewInt(181228)
	ChainIDXDC           = big.NewInt(50)
	ChainIDXDCApothem    = big.NewInt(51)
	ChainIDIgra          = big.NewInt(38833)
	ChainIDFlare         = big.NewInt(14)
	ChainIDCelo          = big.NewInt(42220)
	ChainIDCeloSepolia   = big.NewInt(11142220)

	// Network configurations
	// See DEFAULT_ASSETS.md for guidelines on adding new chains
	//
	// Default Asset Selection Policy:
	// - Each chain has the right to determine its own default stablecoin
	// - If the chain has officially endorsed a stablecoin, that asset should be used
	// - If no official stance exists, the chain team should make the selection
	//
	// Both EIP-3009 (transferWithAuthorization) and Permit2 asset transfer methods are supported.
	// EIP-3009 is the default. Set AssetTransferMethod to AssetTransferMethodPermit2 for tokens
	// that don't support EIP-3009. See DEFAULT_ASSETS.md for details.
	NetworkConfigs = map[string]NetworkConfig{

		"eip155:8453": {
			ChainID: ChainIDBase,
			DefaultAsset: AssetInfo{
				Address:  "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
				Name:     "USD Coin",
				Version:  "2",
				Decimals: DefaultDecimals,
			},
		},

		"eip155:84532": {
			ChainID: ChainIDBaseSepolia,
			DefaultAsset: AssetInfo{
				Address:  "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
				Name:     "USDC",
				Version:  "2",
				Decimals: DefaultDecimals,
			},
		},

		"eip155:4326": {
			ChainID: ChainIDMegaETH,
			DefaultAsset: AssetInfo{
				Address:             "0xFAfDdbb3FC7688494971a79cc65DCa3EF82079E7",
				Name:                "MegaUSD",
				Version:             "1",
				Decimals:            18,
				AssetTransferMethod: AssetTransferMethodPermit2,
				SupportsEip2612:     true,
			},
		},

		"eip155:143": {
			ChainID: ChainIDMonad,
			DefaultAsset: AssetInfo{
				Address:  "0x754704Bc059F8C67012fEd69BC8A327a5aafb603",
				Name:     "USD Coin",
				Version:  "2",
				Decimals: DefaultDecimals,
			},
		},

		"eip155:31612": {
			ChainID: ChainIDMezo,
			DefaultAsset: AssetInfo{
				Address:             "0xdD468A1DDc392dcdbEf6db6e34E89AA338F9F186",
				Name:                "Mezo USD",
				Version:             "1",
				Decimals:            18,
				AssetTransferMethod: AssetTransferMethodPermit2,
				SupportsEip2612:     true,
			},
		},

		"eip155:31611": {
			ChainID: ChainIDMezoTestnet,
			DefaultAsset: AssetInfo{
				Address:             "0x118917a40FAF1CD7a13dB0Ef56C86De7973Ac503",
				Name:                "Mezo USD",
				Version:             "1",
				Decimals:            18,
				AssetTransferMethod: AssetTransferMethodPermit2,
				SupportsEip2612:     true,
			},
		},

		"eip155:988": {
			ChainID: ChainIDStable,
			DefaultAsset: AssetInfo{
				Address:  "0x779Ded0c9e1022225f8E0630b35a9b54bE713736",
				Name:     "USDT0",
				Version:  "1",
				Decimals: DefaultDecimals,
			},
		},

		"eip155:2201": {
			ChainID: ChainIDStableTestnet,
			DefaultAsset: AssetInfo{
				Address:  "0x78Cf24370174180738C5B8E352B6D14c83a6c9A9",
				Name:     "USDT0",
				Version:  "1",
				Decimals: DefaultDecimals,
			},
		},

		"eip155:137": {
			ChainID: ChainIDPolygon,
			DefaultAsset: AssetInfo{
				Address:  "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
				Name:     "USD Coin",
				Version:  "2",
				Decimals: DefaultDecimals,
			},
		},

		"eip155:42161": {
			ChainID: ChainIDArbOne,
			DefaultAsset: AssetInfo{
				Address:  "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
				Name:     "USD Coin",
				Version:  "2",
				Decimals: DefaultDecimals,
			},
		},

		"eip155:421614": {
			ChainID: ChainIDArbSepolia,
			DefaultAsset: AssetInfo{
				Address:  "0x75faf114eafb1BDbe2F0316DF893fd58CE46AA4d",
				Name:     "USD Coin",
				Version:  "2",
				Decimals: DefaultDecimals,
			},
		},

		"eip155:723487": {
			ChainID: ChainIDRadius,
			DefaultAsset: AssetInfo{
				Address:             "0x33ad9e4BD16B69B5BFdED37D8B5D9fF9aba014Fb",
				Name:                "Stable Coin",
				Version:             "1",
				Decimals:            DefaultDecimals,
				AssetTransferMethod: AssetTransferMethodPermit2,
				SupportsEip2612:     true,
			},
		},

		"eip155:72344": {
			ChainID: ChainIDRadiusTestnet,
			DefaultAsset: AssetInfo{
				Address:             "0x33ad9e4BD16B69B5BFdED37D8B5D9fF9aba014Fb",
				Name:                "Stable Coin",
				Version:             "1",
				Decimals:            DefaultDecimals,
				AssetTransferMethod: AssetTransferMethodPermit2,
				SupportsEip2612:     true,
			},
		},

		"eip155:36900": {
			ChainID: ChainIDADI,
			DefaultAsset: AssetInfo{
				Address:  "0x9cb8142aEBBcdc60AF7c97Af897A67A8f3CA71C2",
				Name:     "USDC.e",
				Version:  "2",
				Decimals: DefaultDecimals,
			},
		},

		"eip155:190415": {
			ChainID: ChainIDHPP,
			DefaultAsset: AssetInfo{
				Address:  "0x401eCb1D350407f13ba348573E5630B83638E30D",
				Name:     "Bridged USDC",
				Version:  "2",
				Decimals: DefaultDecimals,
			},
		},

		"eip155:181228": {
			ChainID: ChainIDHPPSepolia,
			DefaultAsset: AssetInfo{
				Address:  "0x401eCb1D350407f13ba348573E5630B83638E30D",
				Name:     "Bridged USDC",
				Version:  "2",
				Decimals: DefaultDecimals,
			},
		},

		"eip155:50": {
			ChainID: ChainIDXDC,
			DefaultAsset: AssetInfo{
				Address:  "0xfA2958CB79b0491CC627c1557F441eF849Ca8eb1",
				Name:     "USDC",
				Version:  "2",
				Decimals: DefaultDecimals,
			},
		},

		"eip155:51": {
			ChainID: ChainIDXDCApothem,
			DefaultAsset: AssetInfo{
				Address:  "0xb5AB69F7bBada22B28e79C8FFAECe55eF1c771D4",
				Name:     "USDC",
				Version:  "2",
				Decimals: DefaultDecimals,
			},
		},

		"eip155:38833": {
			ChainID: ChainIDIgra,
			DefaultAsset: AssetInfo{
				Address:             "0xA5b8BF902b2844dA17d4506cc827F7F1681735E7",
				Name:                "USDC",
				Version:             "1",
				Decimals:            DefaultDecimals,
				AssetTransferMethod: AssetTransferMethodPermit2,
			},
		},

		"eip155:14": {
			ChainID: ChainIDFlare,
			DefaultAsset: AssetInfo{
				Address:  "0xe7cd86e13AC4309349F30B3435a9d337750fC82D",
				Name:     "USD₮0",
				Version:  "1",
				Decimals: DefaultDecimals,
			},
		},
		"eip155:42220": {
			ChainID: ChainIDCelo,
			DefaultAsset: AssetInfo{
				Address:  "0xcebA9300f2b948710d2653dD7B07f33A8B32118C",
				Name:     "USDC",
				Version:  "2",
				Decimals: DefaultDecimals,
			},
		},

		"eip155:11142220": {
			ChainID: ChainIDCeloSepolia,
			DefaultAsset: AssetInfo{
				Address:  "0x01C5C0122039549AD1493B8220cABEdD739BC44E",
				Name:     "USDC",
				Version:  "2",
				Decimals: DefaultDecimals,
			},
		},
	}

	// EIP-3009 ABI for transferWithAuthorization with v,r,s (EOA signatures)
	TransferWithAuthorizationVRSABI = []byte(`[
		{
			"inputs": [
				{"name": "from", "type": "address"},
				{"name": "to", "type": "address"},
				{"name": "value", "type": "uint256"},
				{"name": "validAfter", "type": "uint256"},
				{"name": "validBefore", "type": "uint256"},
				{"name": "nonce", "type": "bytes32"},
				{"name": "v", "type": "uint8"},
				{"name": "r", "type": "bytes32"},
				{"name": "s", "type": "bytes32"}
			],
			"name": "transferWithAuthorization",
			"outputs": [],
			"stateMutability": "nonpayable",
			"type": "function"
		}
	]`)

	// EIP-3009 ABI for transferWithAuthorization with bytes signature (smart wallets)
	TransferWithAuthorizationBytesABI = []byte(`[
		{
			"inputs": [
				{"name": "from", "type": "address"},
				{"name": "to", "type": "address"},
				{"name": "value", "type": "uint256"},
				{"name": "validAfter", "type": "uint256"},
				{"name": "validBefore", "type": "uint256"},
				{"name": "nonce", "type": "bytes32"},
				{"name": "signature", "type": "bytes"}
			],
			"name": "transferWithAuthorization",
			"outputs": [],
			"stateMutability": "nonpayable",
			"type": "function"
		}
	]`)

	// Legacy: Combined ABI (deprecated, use specific ABIs above)
	TransferWithAuthorizationABI = TransferWithAuthorizationVRSABI

	// ERC20TransferEventABI for parsing Transfer event logs
	ERC20TransferEventABI = []byte(`[
		{
			"anonymous": false,
			"inputs": [
				{"indexed": true, "name": "from", "type": "address"},
				{"indexed": true, "name": "to", "type": "address"},
				{"indexed": false, "name": "value", "type": "uint256"}
			],
			"name": "Transfer",
			"type": "event"
		}
	]`)

	// ABI for authorizationState check
	AuthorizationStateABI = []byte(`[
		{
			"inputs": [
				{"name": "authorizer", "type": "address"},
				{"name": "nonce", "type": "bytes32"}
			],
			"name": "authorizationState",
			"outputs": [{"name": "", "type": "bool"}],
			"stateMutability": "view",
			"type": "function"
		}
	]`)

	// Multicall3TryAggregateABI batches arbitrary eth_call requests.
	Multicall3TryAggregateABI = []byte(`[
		{
			"inputs": [
				{"name": "requireSuccess", "type": "bool"},
				{
					"name": "calls",
					"type": "tuple[]",
					"components": [
						{"name": "target", "type": "address"},
						{"name": "callData", "type": "bytes"}
					]
				}
			],
			"name": "tryAggregate",
			"outputs": [
				{
					"name": "returnData",
					"type": "tuple[]",
					"components": [
						{"name": "success", "type": "bool"},
						{"name": "returnData", "type": "bytes"}
					]
				}
			],
			"stateMutability": "payable",
			"type": "function"
		}
	]`)

	// ERC20AllowanceABI for checking Permit2 approval
	ERC20AllowanceABI = []byte(`[
		{
			"inputs": [
				{"name": "owner", "type": "address"},
				{"name": "spender", "type": "address"}
			],
			"name": "allowance",
			"outputs": [{"name": "", "type": "uint256"}],
			"stateMutability": "view",
			"type": "function"
		}
	]`)

	// ERC20ApproveABI for approving Permit2
	ERC20ApproveABI = []byte(`[
		{
			"inputs": [
				{"name": "spender", "type": "address"},
				{"name": "amount", "type": "uint256"}
			],
			"name": "approve",
			"outputs": [{"name": "", "type": "bool"}],
			"stateMutability": "nonpayable",
			"type": "function"
		}
	]`)

	// ERC20BalanceOfABI for checking token balance
	ERC20BalanceOfABI = []byte(`[
		{
			"inputs": [
				{"name": "account", "type": "address"}
			],
			"name": "balanceOf",
			"outputs": [{"name": "", "type": "uint256"}],
			"stateMutability": "view",
			"type": "function"
		}
	]`)

	// ERC20NameABI for checking EIP-712 domain name diagnostics.
	ERC20NameABI = []byte(`[
		{
			"inputs": [],
			"name": "name",
			"outputs": [{"name": "", "type": "string"}],
			"stateMutability": "view",
			"type": "function"
		}
	]`)

	// ERC20VersionABI for checking EIP-712 domain version diagnostics.
	ERC20VersionABI = []byte(`[
		{
			"inputs": [],
			"name": "version",
			"outputs": [{"name": "", "type": "string"}],
			"stateMutability": "view",
			"type": "function"
		}
	]`)

	// X402ExactPermit2ProxySettleABI for calling settle on x402ExactPermit2Proxy
	X402ExactPermit2ProxySettleABI = []byte(`[
		{
			"type": "function",
			"name": "settle",
			"inputs": [
				{
					"name": "permit",
					"type": "tuple",
					"components": [
						{
							"name": "permitted",
							"type": "tuple",
							"components": [
								{"name": "token", "type": "address"},
								{"name": "amount", "type": "uint256"}
							]
						},
						{"name": "nonce", "type": "uint256"},
						{"name": "deadline", "type": "uint256"}
					]
				},
				{"name": "owner", "type": "address"},
				{
					"name": "witness",
					"type": "tuple",
					"components": [
						{"name": "to", "type": "address"},
						{"name": "validAfter", "type": "uint256"}
					]
				},
				{"name": "signature", "type": "bytes"}
			],
			"outputs": [],
			"stateMutability": "nonpayable"
		}
	]`)

	// X402ExactPermit2ProxyPermit2ABI for verifying proxy deployment
	X402ExactPermit2ProxyPermit2ABI = []byte(`[
		{
			"inputs": [],
			"name": "PERMIT2",
			"outputs": [{"name": "", "type": "address"}],
			"stateMutability": "view",
			"type": "function"
		}
	]`)

	// Multicall3GetEthBalanceABI for querying native ETH balance via Multicall3.
	Multicall3GetEthBalanceABI = []byte(`[
		{
			"inputs": [
				{"name": "addr", "type": "address"}
			],
			"name": "getEthBalance",
			"outputs": [{"name": "balance", "type": "uint256"}],
			"stateMutability": "view",
			"type": "function"
		}
	]`)

	// X402UptoPermit2ProxySettleABI for calling settle on x402UptoPermit2Proxy.
	// Differs from exact: takes an additional `amount` param and witness includes `facilitator`.
	X402UptoPermit2ProxySettleABI = []byte(`[
		{
			"type": "function",
			"name": "settle",
			"inputs": [
				{
					"name": "permit",
					"type": "tuple",
					"components": [
						{
							"name": "permitted",
							"type": "tuple",
							"components": [
								{"name": "token", "type": "address"},
								{"name": "amount", "type": "uint256"}
							]
						},
						{"name": "nonce", "type": "uint256"},
						{"name": "deadline", "type": "uint256"}
					]
				},
				{"name": "amount", "type": "uint256"},
				{"name": "owner", "type": "address"},
				{
					"name": "witness",
					"type": "tuple",
					"components": [
						{"name": "to", "type": "address"},
						{"name": "facilitator", "type": "address"},
						{"name": "validAfter", "type": "uint256"}
					]
				},
				{"name": "signature", "type": "bytes"}
			],
			"outputs": [],
			"stateMutability": "nonpayable"
		}
	]`)

	// X402UptoPermit2ProxySettleWithPermitABI for calling settleWithPermit on x402UptoPermit2Proxy (EIP-2612 extension).
	X402UptoPermit2ProxySettleWithPermitABI = []byte(`[
		{
			"type": "function",
			"name": "settleWithPermit",
			"inputs": [
				{
					"name": "permit2612",
					"type": "tuple",
					"components": [
						{"name": "value", "type": "uint256"},
						{"name": "deadline", "type": "uint256"},
						{"name": "r", "type": "bytes32"},
						{"name": "s", "type": "bytes32"},
						{"name": "v", "type": "uint8"}
					]
				},
				{
					"name": "permit",
					"type": "tuple",
					"components": [
						{
							"name": "permitted",
							"type": "tuple",
							"components": [
								{"name": "token", "type": "address"},
								{"name": "amount", "type": "uint256"}
							]
						},
						{"name": "nonce", "type": "uint256"},
						{"name": "deadline", "type": "uint256"}
					]
				},
				{"name": "amount", "type": "uint256"},
				{"name": "owner", "type": "address"},
				{
					"name": "witness",
					"type": "tuple",
					"components": [
						{"name": "to", "type": "address"},
						{"name": "facilitator", "type": "address"},
						{"name": "validAfter", "type": "uint256"}
					]
				},
				{"name": "signature", "type": "bytes"}
			],
			"outputs": [],
			"stateMutability": "nonpayable"
		}
	]`)

	// X402UptoPermit2ProxyPermit2ABI for verifying upto proxy deployment
	X402UptoPermit2ProxyPermit2ABI = []byte(`[
		{
			"inputs": [],
			"name": "PERMIT2",
			"outputs": [{"name": "", "type": "address"}],
			"stateMutability": "view",
			"type": "function"
		}
	]`)

	// EIP2612NoncesABI for querying EIP-2612 nonces
	EIP2612NoncesABI = []byte(`[
		{
			"inputs": [
				{"name": "owner", "type": "address"}
			],
			"name": "nonces",
			"outputs": [{"name": "", "type": "uint256"}],
			"stateMutability": "view",
			"type": "function"
		}
	]`)

	// X402ExactPermit2ProxySettleWithPermitABI for calling settleWithPermit (EIP-2612 extension)
	X402ExactPermit2ProxySettleWithPermitABI = []byte(`[
		{
			"type": "function",
			"name": "settleWithPermit",
			"inputs": [
				{
					"name": "permit2612",
					"type": "tuple",
					"components": [
						{"name": "value", "type": "uint256"},
						{"name": "deadline", "type": "uint256"},
						{"name": "r", "type": "bytes32"},
						{"name": "s", "type": "bytes32"},
						{"name": "v", "type": "uint8"}
					]
				},
				{
					"name": "permit",
					"type": "tuple",
					"components": [
						{
							"name": "permitted",
							"type": "tuple",
							"components": [
								{"name": "token", "type": "address"},
								{"name": "amount", "type": "uint256"}
							]
						},
						{"name": "nonce", "type": "uint256"},
						{"name": "deadline", "type": "uint256"}
					]
				},
				{"name": "owner", "type": "address"},
				{
					"name": "witness",
					"type": "tuple",
					"components": [
						{"name": "to", "type": "address"},
						{"name": "validAfter", "type": "uint256"}
					]
				},
				{"name": "signature", "type": "bytes"}
			],
			"outputs": [],
			"stateMutability": "nonpayable"
		}
	]`)

	// EIP712DomainTypes defines the standard EIP-712 domain type for Permit2.
	// Permit2 uses name + chainId + verifyingContract (no version field).
	EIP712DomainTypes = []TypedDataField{
		{Name: "name", Type: "string"},
		{Name: "chainId", Type: "uint256"},
		{Name: "verifyingContract", Type: "address"},
	}

	// Permit2WitnessTypes defines the EIP-712 types for Permit2 with witness.
	// Field order MUST match the on-chain Permit2 contract and TypeScript implementation.
	Permit2WitnessTypes = map[string][]TypedDataField{
		"PermitWitnessTransferFrom": {
			{Name: "permitted", Type: "TokenPermissions"},
			{Name: "spender", Type: "address"},
			{Name: "nonce", Type: "uint256"},
			{Name: "deadline", Type: "uint256"},
			{Name: "witness", Type: "Witness"},
		},
		"TokenPermissions": {
			{Name: "token", Type: "address"},
			{Name: "amount", Type: "uint256"},
		},
		"Witness": {
			{Name: "to", Type: "address"},
			{Name: "validAfter", Type: "uint256"},
		},
	}
)

var EIP2612PermitTypes = map[string][]TypedDataField{
	"Permit": {
		{Name: "owner", Type: "address"},
		{Name: "spender", Type: "address"},
		{Name: "value", Type: "uint256"},
		{Name: "nonce", Type: "uint256"},
		{Name: "deadline", Type: "uint256"},
	},
}

var EIP712DomainTypesWithVersion = []TypedDataField{
	{Name: "name", Type: "string"},
	{Name: "version", Type: "string"},
	{Name: "chainId", Type: "uint256"},
	{Name: "verifyingContract", Type: "address"},
}

var UptoPermit2WitnessTypes = map[string][]TypedDataField{
	"PermitWitnessTransferFrom": {
		{Name: "permitted", Type: "TokenPermissions"},
		{Name: "spender", Type: "address"},
		{Name: "nonce", Type: "uint256"},
		{Name: "deadline", Type: "uint256"},
		{Name: "witness", Type: "Witness"},
	},
	"TokenPermissions": {
		{Name: "token", Type: "address"},
		{Name: "amount", Type: "uint256"},
	},
	"Witness": {
		{Name: "to", Type: "address"},
		{Name: "facilitator", Type: "address"},
		{Name: "validAfter", Type: "uint256"},
	},
}