Governance: implement + test LiquidDemocracy #41

contracts/governance/LiquidDemocracy.sol

@@ -2,9 +2,66 @@ pragma solidity ^0.4.22;
 
 import './IVoting.sol';
 
+import "../tokens/StdDaoToken.sol";
+
+
 // TODO:
 contract DelegationTable is IDelegationTable {
 
+	StdDaoToken public votingToken;
+
+	struct Delegator {
+		mapping (address => uint) tokensForVotingFromAddress;
+		mapping (address => bool) isDelegatedForFrom;
+		mapping (address => bool) isDelegatedFor;
+		uint delegatorsAmount;
+		uint delegatedForAmount;
+		uint tokensForVoting;
+		bool isDelegatedFor;
+		bool isDelegator;
+	}	
+
+	mapping (address => Delegator) delegations;
+
+	constructor(address _votingToken){
+		votingToken = _votingToken;
+	}
+
+	function delegateMyVoiceTo(address _to, uint _tokenAmount) external {
+		require (_to!= address(0));
+		require (_tokenAmount >= votingToken.balanceOf(msg.sender));
+
+		delegations[_to].tokensForVoting += _tokenAmount;
+		delegations[_to].tokensForVotingFromAddress[msg.sender] += _tokenAmount;
+		delegations[_to].delegatorsAmount += 1;
+		delegations[_to].isDelegatedFor = true;
+		delegations[_to].isDelegatedForFrom[msg.sender] = true;
+		delegations[msg.sender].tokensForVoting += _tokenAmount;
+		delegations[msg.sender].isDelegator = true;
+		delegations[msg.sender].isDelegatorFor[_to] = true;
+		delegations[msg.sender].delegatedForAmount += 1;
+	}
+
+	function removeDelegation(address _to) external {
+		require (_to!= address(0));
+		require (delegations[_to].isDelegatedForFrom[msg.sender]);
+		require (delegations[msg.sender].isDelegatorFor[_to]);
+
+		delegations[_to].tokensForVoting -= delegations[_to].tokensForVotingFromAddress[msg.sender];
+		delegations[msg.sender].tokensForVoting -= delegations[_to].tokensForVotingFromAddress[msg.sender];
+		delegations[_to].tokensForVotingFromAddress[msg.sender] = 0;
+		delegations[_to].isDelegatedForFrom[msg.sender] = false;
+		delegations[msg.sender].isDelegatorFor[_to] = false;
+		delegations[_to].delegatorsAmount -= 1;
+		delegations[msg.sender].delegatedForAmount -= 1;
+		if(delegations[_to].delegatorsAmount == 0){
+			delegations[_to].isDelegatedFor = false;
+		}
+		if(delegations[msg.sender].delegatedForAmount == 0){
+			delegations[_to].isDelegator = false;
+		}
+	}
+
 }
 
 // TODO: