common

const (
	// MintOpType is a [RosettaTypes.Operation] type for an Optimism Deposit or "mint" transaction.
	MintOpType = "MINT"
	// BurnOpType is a [RosettaTypes.Operation] type for an Optimism Withdrawal or "burn" transaction.
	BurnOpType = "BURN"
	// An erroneous STOP Type not defined in rosetta-geth-sdk
	StopOpType = "STOP"
)

const (

	// TransferEvent is emitted when an ERC20 token is transferred.
	//
	// TransferEvent is emitted in two bridging scenarios:
	// 1. When a native token is being sent to a non-native chain, from the sender to the bridge contract.
	//    Think: Transferring USDC on Ethereum Mainnet to the Optimism bridge contract,
	//    you will see a Transfer event from the sender (you) to the bridge contract.
	// 2. When a non-native token is being sent to a native chain, from the bridge to the sender contract.
	// 	  Think: "Withdrawing" USDC from Optimism to Ethereum Mainnet. You will see a Transfer event
	// 	  from the bridge contract to you (the sender) once the withdrawal is finalized on Mainnet.
	TransferEvent = "Transfer(address,address,uint256)"

	// ERC20BridgeInitiatedEvent is the topic for the ERC20BridgeInitiated event.
	// It is emitted on the originating chain where a bridge is initiated.
	ERC20BridgeInitiatedEvent = "ERC20BridgeInitiated(address,address,address,address,uint256,bytes)"

	// ERC20BridgeFinalizedEvent is the topic for the ERC20BridgeFinalized event.
	// It is emitted on the destination chain where a bridge is finalized.
	ERC20BridgeFinalizedEvent = "ERC20BridgeFinalized(address,address,address,address,uint256,bytes)"

	// Burn event is emitted when a non-native token is being sent to a native chain.
	// For example, consider Bob bridged 100 Token A (native to Ethereum Mainnet) from Ethereum Mainnet to Optimism.
	// Bob now has 100 Token A on Optimism. He then bridges 100 Token A from Optimism to Ethereum Mainnet.
	// In this case, Bob is bridging a non-native token (Token A) from Optimism to the token's native chain (Ethereum Mainnet).
	// In this case, an ERC20BridgeInitiated event will be emitted alongside a Burn event FROM the sender.
	BurnEvent = "Burn(address,uint256)"

	// Mint event is emitted when a non-native token is being sent to a native chain.
	// For example, consider Bob is bridging 100 Token A (native to Ethereum Mainnet) from Ethereum Mainnet to Optimism.
	// Bob will see a Mint event on Optimism TO the sender (Bob).
	MintEvent = "Mint(address,uint256)"
)