Orderbook Account

const MAX_FILLED_OFFERS: u32 = 120;
const MAX_OFFERS: usize = 2500;
const MAX_PRICE_NODES: usize = 1000;
const MAX_USER_ESCROWS: usize = 1500;
const PRICE_BASE_POINTS: u64 = 1_000_000;
const BASE_POINTS: u64 = 10_000;

pub struct RawOrderbook {
    /// Configuration options for orderbook
    pub configuration_options: ConfigurationOptions,

    /// Link to vault
    pub vault: Pubkey,

    /// Link to orderbook-owned YT position
    pub yield_position: Pubkey,

    /// Address lookup table for orderbook
    pub address_lookup_table: Pubkey,

    /// Exponent core program address
    pub exponent_core_program: Pubkey,

    /// SY program address
    pub sy_program: Pubkey,

    /// Orderbook-owned escrow for SY
    pub token_escrow_sy: Pubkey,

    /// Orderbook-owned escrow for YT
    pub token_escrow_yt: Pubkey,

    /// Orderbook-owned escrow for PT
    pub token_escrow_pt: Pubkey,

    /// CPI accounts storage key
    pub cpi_account_orderbook: Pubkey,

    /// Admin key
    pub admin: Pubkey,

    /// Last seen SY exchange rate
    pub last_sy_exchange_rate: Number,

    /// Financial state of the orderbook
    pub financials: OrderbookFinancials,

    /// Price tree (RedBlackTree)
    /// Key: ln(1 + apy) scaled by PRICE_BASE_POINTS
    pub prices: RedBlackTree<u32, PriceNode, MAX_PRICE_NODES>,

    /// Offer slots (NodeAllocator)
    pub offers: NodeAllocator<Offer, MAX_OFFERS, 4>,

    /// User escrows (NodeAllocator)
    pub user_escrows: NodeAllocator<UserEscrow, MAX_USER_ESCROWS, 2>,

    /// Seed ID for PDA derivation
    pub seed_id: [u8; 4],

    /// Bump for signer authority PDA
    pub signer_bump: [u8; 1],

    /// Reserved padding for alignment
    pub _reserved: [u8; 3],
}

pub struct ConfigurationOptions {
    /// Minimum threshold amount for offers
    pub threshold_amount: u64,

    /// Maker fee rate (ln-scaled)
    pub ln_maker_fee_rate: f64,

    /// Taker fee rate (ln-scaled)
    pub ln_taker_fee_rate: f64,

    /// Price decimal precision
    pub price_decimals: u8,

    /// Reserved for future use
    pub _reserved: [u8; 1024],
}

pub struct OrderbookFinancials {
    /// Last seen SY index
    pub last_seen_sy_index: Number,

    /// YT balance held by orderbook
    pub yt_balance: u64,

    /// SY balance held by orderbook
    pub sy_balance: u64,

    /// PT balance held by orderbook
    pub pt_balance: u64,

    /// Accumulated YT fees
    pub yt_fee_balance: u64,

    /// Accumulated SY fees
    pub sy_fee_balance: u64,

    /// Accumulated PT fees
    pub pt_fee_balance: u64,

    /// Staged SY balance
    pub staged_sy: u64,

    /// Expiration timestamp (copied from vault)
    pub expiration_ts: u32,

    /// Padding for alignment
    pub _padding: [u8; 4],
}