sreUsdFromOracleVault

# @version 0.4.3
"""
@title sreUsdFromOracleVault
@notice Price oracle that uses the reUSD oracle contract 
"""

interface Vault:
    def pricePerShare() -> uint256: view
    def convertToAssets(shares: uint256) -> uint256: view

interface CollateralOracle:
    def price() -> uint256: view  # reUSD/USD using agg price of crvUSD


VAULT: public(immutable(Vault))
ORACLE: public(immutable(CollateralOracle))


@deploy
def __init__(vault: Vault, oracle: CollateralOracle):
    """
    @param vault   ERC4626 vault exposing pricePerShare()
    @param oracle  Collateral oracle returning USD price (1e18)
    """
    VAULT = vault
    ORACLE = oracle


@internal
@view
def _pps() -> uint256:
    return staticcall VAULT.pricePerShare()


@internal
@view
def _raw_price(pps: uint256) -> uint256:
    p_collateral: uint256 = staticcall ORACLE.price()
    if p_collateral > 10**18:
        p_collateral = 10**18
    return p_collateral * pps // 10**18


@external
@view
def price() -> uint256:
    return self._raw_price(self._pps())


@external
def price_w() -> uint256:
    return self._raw_price(self._pps())