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# @version 0.3.7
"""
@title AggregatorStablePrice - aggregator of stablecoin prices for crvUSD
@author Curve.Fi
@license Copyright (c) Curve.Fi, 2020-2023 - all rights reserved
"""
# Returns price of stablecoin in "dollars" based on multiple redeemable stablecoins
# Recommended to use 3+ price sources

interface Stableswap:
    def price_oracle() -> uint256: view
    def coins(i: uint256) -> address: view
    def get_virtual_price() -> uint256: view
    def totalSupply() -> uint256: view


struct PricePair:
    pool: Stableswap
    is_inverse: bool


event AddPricePair:
    n: uint256
    pool: Stableswap
    is_inverse: bool

event RemovePricePair:
    n: uint256

event MovePricePair:
    n_from: uint256
    n_to: uint256

event SetAdmin:
    admin: address


MAX_PAIRS: constant(uint256) = 20
MIN_LIQUIDITY: constant(uint256) = 100_000 * 10**18  # Only take into account pools with enough liquidity

STABLECOIN: immutable(address)
SIGMA: immutable(uint256)
price_pairs: public(PricePair[MAX_PAIRS])
n_price_pairs: uint256

admin: public(address)


@external
def __init__(stablecoin: address, sigma: uint256, admin: address):
    STABLECOIN = stablecoin
    SIGMA = sigma  # The change is so rare that we can change the whole thing altogether
    self.admin = admin


@external
def set_admin(_admin: address):
    # We are not doing commit / apply because the owner will be a voting DAO anyway
    # which has vote delays
    assert msg.sender == self.admin
    self.admin = _admin
    log SetAdmin(_admin)


@external
@view
def sigma() -> uint256:
    return SIGMA


@external
@view
def stablecoin() -> address:
    return STABLECOIN


@external
def add_price_pair(_pool: Stableswap):
    assert msg.sender == self.admin
    price_pair: PricePair = empty(PricePair)
    price_pair.pool = _pool
    coins: address[2] = [_pool.coins(0), _pool.coins(1)]
    if coins[0] == STABLECOIN:
        price_pair.is_inverse = True
    else:
        assert coins[1] == STABLECOIN
    n: uint256 = self.n_price_pairs
    self.price_pairs[n] = price_pair  # Should revert if too many pairs
    self.n_price_pairs = n + 1
    log AddPricePair(n, _pool, price_pair.is_inverse)


@external
def remove_price_pair(n: uint256):
    assert msg.sender == self.admin
    n_max: uint256 = self.n_price_pairs - 1
    assert n <= n_max

    if n < n_max:
        self.price_pairs[n] = self.price_pairs[n_max]
        log MovePricePair(n_max, n)
    self.n_price_pairs = n_max
    log RemovePricePair(n)


@internal
@view
def exp(power: int256) -> uint256:
    if power <= -42139678854452767551:
        return 0

    if power >= 135305999368893231589:
        raise "exp overflow"

    x: int256 = unsafe_div(unsafe_mul(power, 2**96), 10**18)

    k: int256 = unsafe_div(
        unsafe_add(
            unsafe_div(unsafe_mul(x, 2**96), 54916777467707473351141471128),
            2**95),
        2**96)
    x = unsafe_sub(x, unsafe_mul(k, 54916777467707473351141471128))

    y: int256 = unsafe_add(x, 1346386616545796478920950773328)
    y = unsafe_add(unsafe_div(unsafe_mul(y, x), 2**96), 57155421227552351082224309758442)
    p: int256 = unsafe_sub(unsafe_add(y, x), 94201549194550492254356042504812)
    p = unsafe_add(unsafe_div(unsafe_mul(p, y), 2**96), 28719021644029726153956944680412240)
    p = unsafe_add(unsafe_mul(p, x), (4385272521454847904659076985693276 * 2**96))

    q: int256 = x - 2855989394907223263936484059900
    q = unsafe_add(unsafe_div(unsafe_mul(q, x), 2**96), 50020603652535783019961831881945)
    q = unsafe_sub(unsafe_div(unsafe_mul(q, x), 2**96), 533845033583426703283633433725380)
    q = unsafe_add(unsafe_div(unsafe_mul(q, x), 2**96), 3604857256930695427073651918091429)
    q = unsafe_sub(unsafe_div(unsafe_mul(q, x), 2**96), 14423608567350463180887372962807573)
    q = unsafe_add(unsafe_div(unsafe_mul(q, x), 2**96), 26449188498355588339934803723976023)

    return shift(
        unsafe_mul(convert(unsafe_div(p, q), uint256), 3822833074963236453042738258902158003155416615667),
        unsafe_sub(k, 195))


@external
@view
def price() -> uint256:
    n: uint256 = self.n_price_pairs
    prices: uint256[MAX_PAIRS] = empty(uint256[MAX_PAIRS])
    D: uint256[MAX_PAIRS] = empty(uint256[MAX_PAIRS])
    Dsum: uint256 = 0
    DPsum: uint256 = 0
    for i in range(MAX_PAIRS):
        if i == n:
            break
        price_pair: PricePair = self.price_pairs[i]
        pool_supply: uint256 = price_pair.pool.totalSupply()
        if pool_supply >= MIN_LIQUIDITY:
            p: uint256 = price_pair.pool.price_oracle()
            if price_pair.is_inverse:
                p = 10**36 / p
            prices[i] = p
            _D: uint256 = price_pair.pool.get_virtual_price() * pool_supply / 10**18
            D[i] = _D
            Dsum += _D
            DPsum += _D * p
    if Dsum == 0:
        return 10**18  # Placeholder for no active pools
    p_avg: uint256 = DPsum / Dsum
    e: uint256[MAX_PAIRS] = empty(uint256[MAX_PAIRS])
    e_min: uint256 = max_value(uint256)
    for i in range(MAX_PAIRS):
        if i == n:
            break
        p: uint256 = prices[i]
        e[i] = (max(p, p_avg) - min(p, p_avg))**2 / (SIGMA**2 / 10**18)
        e_min = min(e[i], e_min)
    wp_sum: uint256 = 0
    w_sum: uint256 = 0
    for i in range(MAX_PAIRS):
        if i == n:
            break
        w: uint256 = D[i] * self.exp(-convert(e[i] - e_min, int256)) / 10**18
        w_sum += w
        wp_sum += w * prices[i]
    return wp_sum / w_sum

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[{"name":"AddPricePair","inputs":[{"name":"n","type":"uint256","indexed":false},{"name":"pool","type":"address","indexed":false},{"name":"is_inverse","type":"bool","indexed":false}],"anonymous":false,"type":"event"},{"name":"RemovePricePair","inputs":[{"name":"n","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"MovePricePair","inputs":[{"name":"n_from","type":"uint256","indexed":false},{"name":"n_to","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"SetAdmin","inputs":[{"name":"admin","type":"address","indexed":false}],"anonymous":false,"type":"event"},{"stateMutability":"nonpayable","type":"constructor","inputs":[{"name":"stablecoin","type":"address"},{"name":"sigma","type":"uint256"},{"name":"admin","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"set_admin","inputs":[{"name":"_admin","type":"address"}],"outputs":[]},{"stateMutability":"view","type":"function","name":"sigma","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"stablecoin","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"nonpayable","type":"function","name":"add_price_pair","inputs":[{"name":"_pool","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"remove_price_pair","inputs":[{"name":"n","type":"uint256"}],"outputs":[]},{"stateMutability":"view","type":"function","name":"price","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"price_pairs","inputs":[{"name":"arg0","type":"uint256"}],"outputs":[{"name":"","type":"tuple","components":[{"name":"pool","type":"address"},{"name":"is_inverse","type":"bool"}]}]},{"stateMutability":"view","type":"function","name":"admin","inputs":[],"outputs":[{"name":"","type":"address"}]}]

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000000000000000000000000f939e0a03fb07f59a73314e73794be0e57ac1b4e00000000000000000000000000000000000000000000000000038d7ea4c68000000000000000000000000000babe61887f1de2713c6f97e567623453d3c79f67

-----Decoded View---------------
Arg [0] : stablecoin (address): 0xf939E0A03FB07F59A73314E73794Be0E57ac1b4E
Arg [1] : sigma (uint256): 1000000000000000
Arg [2] : admin (address): 0xbabe61887f1de2713c6f97e567623453d3C79f67

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000f939e0a03fb07f59a73314e73794be0e57ac1b4e
Arg [1] : 00000000000000000000000000000000000000000000000000038d7ea4c68000
Arg [2] : 000000000000000000000000babe61887f1de2713c6f97e567623453d3c79f67