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use anchor_lang::prelude::{*, borsh::BorshSchema};
use std::io::Write;
use crate::drift::SafeMath;
use crate::errors::ReflectErrorCodes;
use crate::reflect::helpers::{calc_all_cuts, compute_receipt_token};
#[repr(C)]
#[derive(BorshSchema, AnchorDeserialize, AnchorSerialize, Default, Debug, Clone, InitSpace, PartialEq, Eq)]
pub struct AutoCompound {
/// Total collateral **amount** currently attributed to vault holders.
/// - Units: **collateral (base units)**
/// - Includes: all user deposits + all pool allocations (index 0 cut) captured so far
/// - Excludes: any value queued for extraction to fee recipients (Q)
/// - Mutates on:
/// * deposit → V += deposit_collateral
/// * redeem → V -= redeemed_collateral
/// * capture → V += pool_allocation_collateral (index 0 share only)
pub deposited_vault_value: u64,
/// Net user cashflow since the last capture.
/// - Units: **collateral (signed)**
/// - Purpose: isolate organic PnL from user flows when computing capturable yield
/// - Updates:
/// * after deposit → += deposit_collateral
/// * after redeem → -= redeemed_collateral
/// * after capture → reset to 0
pub net_user_flow_since_capture: i64,
/// Vault's observed total **collateral** at the most recent capture boundary.
/// - Units: **collateral**
/// - Used as the baseline for `refresh_autocompounder(current_total_collateral)`
/// - On capture:
/// * compute yield/loss vs `last_pool_value + net_user_flow_since_capture`
/// * then set `last_pool_value = post_capture_pool_value`
pub last_pool_value: u64,
/// Total receipt tokens currently queued to be minted to recipients.
/// - Units: **receipt tokens**
/// - Semantics: recipients' portion of profit, converted to receipt tokens at the current PPS
/// - On capture/process_yield:
/// * Q_receipt += receipt_rate(recipients_collateral)
/// - On distribution (mint step):
/// * consumer reads Q_receipt, mints, then resets/decrements Q_receipt
pub queued_recipient_shares: u64,
}
impl AutoCompound {
pub fn update_total_capturable_yield(&mut self, value: u64){
self.queued_recipient_shares = value;
}
pub fn calculate_capturable_yield(&self, current_value: u64) -> Result<i64> {
// Expected value = last recorded value + net user flows.
let expected_value = if self.net_user_flow_since_capture >= 0 {
self.last_pool_value.safe_add(self.net_user_flow_since_capture as u64)?
} else {
self.last_pool_value.safe_sub((-self.net_user_flow_since_capture) as u64)?
};
// Calculate yield as signed value (can be negative for losses).
let yield_or_loss = (current_value as i128) - (expected_value as i128);
if yield_or_loss > i64::MAX as i128 {
return Err(ReflectErrorCodes::MathError.into());
} else if yield_or_loss < i64::MIN as i128 {
return Err(ReflectErrorCodes::MathError.into());
}
Ok(yield_or_loss as i64)
}
pub fn update_pool_value(&mut self, value: u64){
self.last_pool_value = value;
}
/// Settle yield/loss vs. the baseline, book pool keep into V (USDC),
/// queue **recipient mints** as SHARES (USDC+), and advance the baseline.
///
/// ### Invariants & Units
/// - `current_total_usdc`: observed assets under management (USDC).
/// - `cuts_bp[0]`: pool keep (stays in V, **no mint** to index 0).
/// - `cuts_bp[1..]`: recipients to **mint** (SHARES) later.
/// - `deposited_vault_value (V)`: USDC.
/// - `effective_supply (S)`: SHARES (USDC+ tokens).
/// - `queued_recipient_shares (Q)`: **SHARES to mint** to recipients i≥1 (not value).
///
/// ### Cases
/// 1) Loss: V -= loss; Q unchanged; baseline = current_total_usdc.
/// 2) No change: nothing; baseline = current_total_usdc.
/// 3) Profit:
/// - Split profit in **USDC** with `cuts_bp`.
/// - Add pool keep (index 0) to **V** (PPS ↑), **mint nothing** for index 0.
/// - Convert recipients' **USDC** portion to **SHARES** at **current PPS** (after pool keep is booked).
/// - Q += shares_for_recipients.
/// - Baseline = current_total_usdc (no assets left; we’re minting later).
///
/// ### Why baseline = current_total_usdc on profit?
/// Minting shares to recipients does not move USDC out of the pool; it inflates S.
/// Therefore the on-chain assets remain the observed amount; only PPS is affected when
/// we later mint those shares.
pub fn update_pool(&mut self, current_total_usdc: u64, cuts_bp: &[u16], token_supply: u64) -> Result<()> {
// Compute organic signed PnL vs the moving baseline:
// y = current_total_usdc - (last_pool_value +/- net_user_flow_since_capture)
let y: i64 = self.calculate_capturable_yield(current_total_usdc)?;
// --------- LOSS PATH ---------
if y < 0 {
// Book the loss directly into V. No recipient queue changes.
self.deposited_vault_value = self.deposited_vault_value.safe_sub(y.unsigned_abs())?;
// --------- PROFIT PATH ---------
} else if y > 0 {
// Split profit as: pool_keep (index 0) + recipients (i>=1).
let profit_usdc: u64 = y as u64;
let amounts_usdc: Vec<u64> = calc_all_cuts(profit_usdc, cuts_bp.to_vec())?;
let pool_keep_usdc = amounts_usdc.get(0).copied().unwrap_or(0);
let recipients_usdc = profit_usdc.safe_sub(pool_keep_usdc)?;
// Let profit_usdc = pool_keep_usdc + recipients_usdc.
// No USDC leaves the external vault during capture; recipients (i>=1) are paid via new share issuance.
// Therefore the vault's assets under management (V) must increase by the FULL profit:
// V_after = V_before + profit_usdc
// = V_before + (pool_keep_usdc + recipients_usdc)
// If we only added pool_keep_usdc to V and then minted recipient shares (S↑),
// PPS = V/S would be depressed, enabling cheap mints and underpaying redemptions until the next capture.
self.deposited_vault_value = self.deposited_vault_value.safe_add(profit_usdc)?;
// Now compute how many shares to mint to recipients so their post-mint value equals exactly recipients_usdc with no dilution:
if recipients_usdc > 0 {
require!(token_supply > 0, ReflectErrorCodes::MathError);
require!(self.deposited_vault_value > recipients_usdc, ReflectErrorCodes::MathError);
// Denominator should be V_before + pool_keep_usdc:
let v_minus_r: u64 = self.deposited_vault_value.safe_sub(recipients_usdc)?;
// Solve: shares to mint = recipients_usdc * S / (V_after - recipients_usdc)
let shares_to_mint: u64 = compute_receipt_token(recipients_usdc, v_minus_r, token_supply)?;
// Shares minted to recipients by the caller in the same tx path.
self.queued_recipient_shares = self.queued_recipient_shares.safe_add(shares_to_mint)?;
}
// Note: no shares to index 0 in AutoCompound mode; pool_keep_usdc is already
// reflected in V and benefits existing LPs via higher PPS.
}
// Advance the capture baseline to the observed total vault collateral.
self.last_pool_value = current_total_usdc;
// Reset net user flows for the next interval.
self.net_user_flow_since_capture = 0;
Ok(())
}
pub fn deserialize(buf: &mut &[u8]) -> Result<Self> {
let deposited_vault_value = u64::deserialize(buf)?;
let net_user_flow_since_capture = i64::deserialize(buf)?;
let last_pool_value = u64::deserialize(buf)?;
let queued_recipient_shares = u64::deserialize(buf)?;
Ok(AutoCompound {
deposited_vault_value,
net_user_flow_since_capture,
last_pool_value,
queued_recipient_shares,
})
}
pub fn try_serialise<W: Write>(&self, writer: &mut W) -> Result<()> {
self.deposited_vault_value.serialize(writer)?;
self.net_user_flow_since_capture.serialize(writer)?;
self.last_pool_value.serialize(writer)?;
self.queued_recipient_shares.serialize(writer)?;
Ok(())
}
}
pub const AUTOCOMPOUND_START: usize = 1026;
pub fn deserialise_autocompound(data_usdc_controller: &[u8]) -> Result<AutoCompound> {
if data_usdc_controller.len() < AUTOCOMPOUND_START + 40 {
return Err(ReflectErrorCodes::InsufficientData.into());
}
let mut slice = &data_usdc_controller[AUTOCOMPOUND_START..];
AutoCompound::deserialize(&mut slice)
.map_err(|_| ReflectErrorCodes::DeserializationError.into())
}