حسابات AMM v4

// programs/amm/src/state.rs (مختصر؛ ترتيب الحقول والأسماء تتبع IDL)
pub struct AmmInfo {
    pub status: u64,           // bitmask: swap/deposit/withdraw/crank enabled
    pub nonce:  u64,           // bump used to derive amm_authority
    pub order_num: u64,
    pub depth: u64,
    pub coin_decimals: u64,
    pub pc_decimals:   u64,
    pub state:         u64,    // internal state machine
    pub reset_flag:    u64,
    pub min_size:      u64,
    pub vol_max_cut_ratio: u64,
    pub amount_wave: u64,
    pub coin_lot_size: u64,    // legacy (OpenBook lot size); now initialized to 0
    pub pc_lot_size:   u64,    // legacy; now initialized to 0
    pub min_price_multiplier: u64,
    pub max_price_multiplier: u64,
    pub sys_decimal_value: u64,

    pub fees: Fees,            // trade/protocol/fund fee rates
    pub state_data: StateData,

    // Pool-owned accounts:
    pub coin_vault: Pubkey,
    pub pc_vault:   Pubkey,
    pub coin_vault_mint: Pubkey,
    pub pc_vault_mint:   Pubkey,
    pub lp_mint:  Pubkey,
    pub open_orders: Pubkey,   // pool's OpenOrders on OpenBook
    pub market: Pubkey,        // OpenBook market
    pub market_program: Pubkey, // OpenBook program ID
    pub target_orders: Pubkey,
    pub padding1: [u64; 8],     // reserved — NOT withdraw_queue / lp_vault
    pub amm_owner: Pubkey,      // admin (multisig)
    pub lp_amount: u64,         // the pool's internal LP total; see the note below
    pub client_order_id: u64,
    pub recent_epoch: u64,
    pub padding2: u64,
}

pub struct Fees {
    pub min_separate_numerator:   u64,     // 5
    pub min_separate_denominator: u64,     // 10_000
    pub trade_fee_numerator:      u64,     // 25  → used by OpenBook integration
    pub trade_fee_denominator:    u64,     // 10_000
    pub pnl_numerator:            u64,     // 12  → protocol's share OF the swap fee
    pub pnl_denominator:          u64,     // 100 → so 12/100 = 12% of fee, = 0.03% of volume
    pub swap_fee_numerator:       u64,     // 25  → 0.25% gross swap fee
    pub swap_fee_denominator:     u64,     // 10_000
}

pub struct StateData {
    pub need_take_pnl_coin: u64,        // still updated — accrued protocol fee (coin side)
    pub need_take_pnl_pc:   u64,        // still updated — accrued protocol fee (pc side)
    pub total_pnl_pc:   u64,            // DEPRECATED — no longer updated
    pub total_pnl_coin: u64,            // DEPRECATED — no longer updated
    pub pool_open_time: u64,            // still used — pool open timestamp
    pub padding: [u64; 2],              // reserved
    pub orderbook_to_init_time: u64,    // DEPRECATED — no longer updated
    pub swap_coin_in_amount: u128,      // DEPRECATED — volume counters frozen
    pub swap_pc_out_amount:  u128,      // DEPRECATED
    pub swap_acc_pc_fee:    u64,        // DEPRECATED
    pub swap_pc_in_amount:  u128,       // DEPRECATED
    pub swap_coin_out_amount: u128,     // DEPRECATED
    pub swap_acc_coin_fee:  u64,        // DEPRECATED
}

const market = ...;  // OpenBook market PublicKey

// Fields OpenBook exposes on its market account:
const marketDecoded = OpenBookMarket.decode(marketAccountData);
const {
  bids:           serumBids,
  asks:           serumAsks,
  eventQueue:     serumEventQueue,
  requestQueue:   serumRequestQueue,
  baseVault:      serumCoinVault,
  quoteVault:     serumPcVault,
  vaultSignerNonce,
} = marketDecoded;

const serumVaultSigner = PublicKey.createProgramAddressSync(
  [market.toBuffer(), u64ToBytes(vaultSignerNonce)],
  OPENBOOK_PROGRAM_ID,
);

const AMM_V4_PROGRAM_ID = new PublicKey(
  "675kPX9MHTjS2zt1qfr1NYHuzeLXfQM9H24wFSUt1Mp8",
);
const [ammAuthority] = PublicKey.findProgramAddressSync(
  [Buffer.from("amm authority")],
  AMM_V4_PROGRAM_ID,
);

const [ammId] = PublicKey.findProgramAddressSync(
  [
    AMM_V4_PROGRAM_ID.toBuffer(),
    marketPubkey.toBuffer(),
    Buffer.from("amm_associated_seed"),
  ],
  AMM_V4_PROGRAM_ID,
);