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# FutarchyRouter

The FutarchyRouter contract replicates the main Conditional Tokens functions, but allowing to work with ERC20 outcomes instead of the ERC1155.

## Variables

### conditionalTokens

```solidity
contract IConditionalTokens conditionalTokens
```

*Conditional Tokens contract.*

### wrapped1155Factory

```solidity
contract IWrapped1155Factory wrapped1155Factory
```

*Wrapped1155Factory contract.*

## Functions

### constructor

```solidity
constructor(contract IConditionalTokens _conditionalTokens, contract IWrapped1155Factory _wrapped1155Factory) public
```

*Constructor.*

**Parameters**

| Name                 | Type                         | Description                  |
| -------------------- | ---------------------------- | ---------------------------- |
| \_conditionalTokens  | contract IConditionalTokens  | Conditional Tokens contract. |
| \_wrapped1155Factory | contract IWrapped1155Factory | Wrapped1155Factory contract. |

### splitPosition

```solidity
function splitPosition(contract FutarchyProposal proposal, contract IERC20 collateralToken, uint256 amount) public
```

Transfers the collateral to the FutarchyRouter, splits the position and sends the ERC20 outcome tokens back to the user.

*The ERC20 associated to each outcome must be previously created on the wrapped1155Factory. Collateral tokens are deposited only if we are not splitting a deep position (proposal.parentCollectionId is bytes32(0)).*

**Parameters**

| Name            | Type              | Description                                  |
| --------------- | ----------------- | -------------------------------------------- |
| proposal        | contract Proposal | The Proposal to split.                       |
| collateralToken | contract IERC20   | The address of the ERC20 used as collateral. |
| amount          | uint256           | The amount of collateral to split.           |

**Pre-condition**

1. The ERC20 associated to each outcome must be previously created on the wrapped1155Factory.
2. The caller must have \<amount> collateral tokens or ERC20 parent outcome tokens (in the case <mark style="color:red;">`proposal.parentCollectionId`</mark> is not null).

**Logic**

When <mark style="color:red;">`proposal.parentCollectionId`</mark> is null:

1. Transfer \<amount> collateral from the user to <mark style="color:red;">`FutarchyRouter`</mark>.
2. Call <mark style="color:red;">`conditionalTokens.splitPosition`</mark>  to transfer \<amount> collateral from <mark style="color:red;">`FutarchyRouter`</mark>to <mark style="color:red;">`ConditionalTokens`</mark>, while minting corresponding ERC1155 outcome tokens to <mark style="color:red;">`FutarchyRouter`</mark>.

When <mark style="color:red;">`proposal.parentCollectionId`</mark> is not null:

1. Unwrap ERC20 parent outcome tokens back to ERC1155 tokens.
2. Call <mark style="color:red;">`conditionalTokens.splitPosition`</mark>  to transfer ERC1155 parent outcome tokens from <mark style="color:red;">`FutarchyRouter`</mark>to <mark style="color:red;">`ConditionalTokens`</mark>, burning them while minting corresponding conditional outcome tokens to <mark style="color:red;">`FutarchyRouter`</mark>.

Step 3 is the same in both cases:

3. Transfer ERC1155 outcome tokens from <mark style="color:red;">`FutarchyRouter`</mark> to <mark style="color:red;">`Wrapped1155Factory`</mark> contract. There is a callback function in <mark style="color:red;">`Wrapped1155Factory`</mark> that will wrap the tokens into ERC20 tokens, then transfer the wrapped tokens back to the original user.

### \_splitPosition

```solidity
function _splitPosition(contract FutarchyProposal proposal, contract IERC20 collateralToken, uint256 amount) internal
```

Splits a position and sends the ERC20 outcome tokens to the user.

*The ERC20 associated to each outcome must be previously created on the wrapped1155Factory.*

**Parameters**

| Name            | Type                      | Description                                  |
| --------------- | ------------------------- | -------------------------------------------- |
| proposal        | contract FutarchyProposal | The Proposal to split.                       |
| collateralToken | contract IERC20           | The address of the ERC20 used as collateral. |
| amount          | uint256                   | The amount of collateral to split.           |

### mergePositions

```solidity
function mergePositions(contract FutarchyProposal proposal, contract IERC20 collateralToken, uint256 amount) public
```

Merges positions and sends the collateral tokens to the user.

*The ERC20 associated to each outcome must be previously created on the wrapped1155Factory. Collateral tokens are withdrawn only if we are not merging a deep position (market.parentCollectionId is bytes32(0)).*

**Parameters**

| Name            | Type                      | Description                                  |
| --------------- | ------------------------- | -------------------------------------------- |
| proposal        | contract FutarchyProposal | The Proposal to merge.                       |
| collateralToken | contract IERC20           | The address of the ERC20 used as collateral. |
| amount          | uint256                   | The amount of outcome tokens to merge.       |

**Pre-condition**

1. The ERC20 associated to each outcome must be previously created on the wrapped1155Factory.
2. The caller must have \<amount> ERC20 tokens of all the outcomes of a proposal.

**Logic**

Merging positions does precisely the opposite of what splitting a position does.&#x20;

1. Unwraps ERC20 outcome tokens (which will burn these tokens and transfer corresponding ERC1155 outcome tokens back to the <mark style="color:red;">`FutarchyRouter`</mark> contract).&#x20;
2. Call <mark style="color:red;">`conditionalTokens.mergePositions`</mark> to burn ERC1155 outcome tokens. Then:

When <mark style="color:red;">`market.parentCollectionId`</mark> is null:

3. Return collateral to <mark style="color:red;">`FutarchyRouter`</mark> , which will then be sent to the user.

When <mark style="color:red;">`proposal.parentCollectionId`</mark> is not null:

3. <mark style="color:red;">`conditionalTokens`</mark> will mint ERC1155 parent outcome tokens and send to <mark style="color:red;">`FutarchyRouter`</mark> . <mark style="color:red;">`FutarchyRouter`</mark> will wrap these tokens to ERC20 and send to the user.

### \_mergePositions

```solidity
function _mergePositions(contract FutarchyProposal proposal, contract IERC20 collateralToken, uint256 amount) internal
```

Merges positions and receives the collateral tokens.

*Callers to this function must send the collateral to the user.*

**Parameters**

| Name            | Type                      | Description                                  |
| --------------- | ------------------------- | -------------------------------------------- |
| proposal        | contract FutarchyProposal | The proposal to merge.                       |
| collateralToken | contract IERC20           | The address of the ERC20 used as collateral. |
| amount          | uint256                   | The amount of outcome tokens to merge.       |

### redeemPositions

```solidity
function redeemPositions(contract FutarchyProposal proposal, contract IERC20 collateralToken, uint256 amounts) public
```

Redeems positions and sends the collateral tokens to the user.

*The ERC20 associated to each outcome must be previously created on the wrapped1155Factory. Collateral tokens are withdrawn only if we are not redeeming a deep position (parentCollectionId is bytes32(0)).*

**Parameters**

| Name            | Type                      | Description                                  |
| --------------- | ------------------------- | -------------------------------------------- |
| proposal        | contract FutarchyProposal | The Proposal to redeem.                      |
| collateralToken | contract IERC20           | The address of the ERC20 used as collateral. |
| amount          | uint256                   | Amount to redeem.                            |

**Pre-condition**

1. The ERC20 associated to each outcome must be previously created on the wrapped1155Factory.
2. The caller must have ERC20 tokens of the outcome they want to redeem.
3. <mark style="color:red;">`conditionalTokens.reportPayouts`</mark> has been called by an oracle.

**Logic**

1. Unwraps ERC20 outcome tokens (which will burn these tokens and transfer corresponding ERC1155 outcome tokens back to the <mark style="color:red;">`Router`</mark> contract).&#x20;
2. Call <mark style="color:red;">`conditionalTokens.redeemPositions`</mark> to burn ERC1155 outcome tokens. Then:

When <mark style="color:red;">`proposal.parentCollectionId`</mark> is null:

3. Return collateral to <mark style="color:red;">`FutarchyRouter`</mark> .  The return amount is in proportion to the <mark style="color:red;">`ConditionalTokens`</mark> payouts. <mark style="color:red;">`FutarchyRouter`</mark> will calculate the collateral difference before and after redeeming and transfer the difference to the user.

When <mark style="color:red;">`proposal.parentCollectionId`</mark> is not null:

3. <mark style="color:red;">`conditionalTokens`</mark> will mint ERC1155 parent outcome tokens and send to <mark style="color:red;">`FutarchyRouter`</mark> . The amount is in proportion to the <mark style="color:red;">`ConditionalTokens`</mark> payouts. <mark style="color:red;">`FutarchyRouter`</mark> will calculate the ERC1155 outcome tokens difference before and after redeeming, wrap the difference to ERC20 and send to the user.

### \_redeemPositions

```solidity
function _redeemPositions(contract FutarchyProposal proposal, contract IERC20 collateralToken, uint256 amount) internal
```

Redeems positions and sends the collateral tokens to the user.

*Callers to this function must send the collateral to the user.*

**Parameters**

| Name            | Type                      | Description                                  |
| --------------- | ------------------------- | -------------------------------------------- |
| proposal        | contract FutarchyProposal | The Proposal to redeem.                      |
| collateralToken | contract IERC20           | The address of the ERC20 used as collateral. |
| amount          | uint256                   | Amount to redeem.                            |

### redeemProposal

```solidity
function redeemProposal(contract FutarchyProposal proposal, uint256 amount1, uint256 amount2) internal
```

Redeems positions and receives the collateral tokens.

It's a wrapper around <mark style="color:red;">`redeemPositions`</mark> that allows to redeem one or two collateral at the same time.

**Parameters**

| Name     | Type                      | Description                                  |
| -------- | ------------------------- | -------------------------------------------- |
| proposal | contract FutarchyProposal | The Proposal to redeem.                      |
| amount1  | uint256                   | Amount of the token collateral to redeem.    |
| amount2  | uint256                   | Amount of the currency collateral to redeem. |

### getTokenId

```solidity
function getTokenId(contract IERC20 collateralToken, bytes32 parentCollectionId, bytes32 conditionId, uint256 indexSet) public view returns (uint256)
```

Constructs a tokenId from a collateral token and an outcome collection.

**Parameters**

| Name               | Type            | Description                                                                        |
| ------------------ | --------------- | ---------------------------------------------------------------------------------- |
| collateralToken    | contract IERC20 | The address of the ERC20 used as collateral.                                       |
| parentCollectionId | bytes32         | The Conditional Tokens parent collection id.                                       |
| conditionId        | bytes32         | The id of the condition used to redeem.                                            |
| indexSet           | uint256         | Index set of the outcome collection to combine with the parent outcome collection. |

**Return Values**

| Name | Type    | Description   |
| ---- | ------- | ------------- |
| \[0] | uint256 | The token id. |

### getWinningOutcomes

```solidity
function getWinningOutcomes(bytes32 conditionId) external view returns (bool[])
```

Helper function used to know the redeemable outcomes associated to a conditionId.

**Parameters**

| Name        | Type    | Description              |
| ----------- | ------- | ------------------------ |
| conditionId | bytes32 | The id of the condition. |

**Return Values**

| Name | Type    | Description                                                                       |
| ---- | ------- | --------------------------------------------------------------------------------- |
| \[0] | bool\[] | An array of outcomes where a true value indicates that the outcome is redeemable. |