حسابات المزرعة / التثبيت (Staking)

// programs/farm_v6/src/state/farm.rs (abridged)
pub struct FarmState {
    pub state: u64,                // bitfield: 0 = live, 1 = paused, ...
    pub nonce: u64,                 // bump for farm_authority
    pub creator: Pubkey,            // original creator (can add rewards / transfer admin)
    pub staking_mint: Pubkey,
    pub staking_vault: Pubkey,
    pub staking_token_program: Pubkey, // SPL Token or Token-2022
    pub lp_mint_decimals: u8,
    pub reward_period_len: u64,     // minimum duration between SetRewards edits
    pub reward_period_min: u64,
    pub total_staked: u64,
    pub reward_info_count: u8,
    pub _reserved: [u8; ...],
    pub reward_infos: [RewardInfo; 5], // up to 5 reward streams
}

pub struct RewardInfo {
    pub reward_state: u8,           // 0 = unused, 1 = running, 2 = ended
    pub open_time: u64,             // start_time
    pub end_time: u64,
    pub last_update_time: u64,
    pub emission_per_second_x64: u128, // Q64.64 fixed-point rate
    pub reward_total_emissioned: u64,   // sum of emissions so far
    pub reward_claimed: u64,            // sum paid out to stakers
    pub reward_vault: Pubkey,
    pub reward_mint: Pubkey,
    pub reward_sender: Pubkey,          // who deposited the budget; can top up
    pub reward_token_program: Pubkey,   // SPL or Token-2022
    pub reward_per_share_x64: u128,     // Q64.64 counter
}

pub struct FarmStateV5 {
    pub state: u64,
    pub nonce: u64,
    pub lp_vault: Pubkey,            // aka staking_vault
    pub reward_vaults: [Pubkey; 2],
    pub owner: Pubkey,
    pub reward_mints: [Pubkey; 2],
    pub reward_total_emissioned: [u64; 2],
    pub reward_claimed: [u64; 2],
    pub reward_per_second: [u64; 2],  // integer, not fixed-point
    pub reward_open_time: [u64; 2],
    pub reward_end_time: [u64; 2],
    pub reward_per_share: [u128; 2],  // Q56.8 or similar; check program source
    pub total_staked: u64,
    pub last_slot: u64,               // v5 updates per-slot on mainnet
    pub _reserved: [u8; 256],
}

pub struct FarmStateV3 {
    pub state: u64,
    pub nonce: u64,
    pub lp_vault: Pubkey,
    pub reward_vault: Pubkey,          // single reward
    pub owner: Pubkey,
    pub reward_mint: Pubkey,
    pub reward_total_emissioned: u64,
    pub reward_claimed: u64,
    pub reward_per_slot: u64,
    pub reward_per_share: u128,
    pub total_staked: u64,
    pub last_slot: u64,
    pub _reserved: [u8; 256],
}

// v6
const [ledgerPda] = PublicKey.findProgramAddressSync(
  [farmId.toBuffer(), user.toBuffer(), Buffer.from("user_stake_info_v2")],
  FARM_V6_PROGRAM_ID,
);

// v5
const [stakePda] = PublicKey.findProgramAddressSync(
  [farmId.toBuffer(), user.toBuffer(), Buffer.from("user_stake_info")],
  FARM_V5_PROGRAM_ID,
);

// v3
const [stakePda] = PublicKey.findProgramAddressSync(
  [farmId.toBuffer(), user.toBuffer(), Buffer.from("staker_info")],
  FARM_V3_PROGRAM_ID,
);

// v6
pub struct UserLedger {
    pub version: u64,
    pub farm_id: Pubkey,
    pub owner: Pubkey,
    pub deposited: u64,                          // current stake
    pub reward_debts: [u128; 5],                 // snapshot of reward_per_share_x64 × deposited
}

pending_for_stream_i = deposited × reward_per_share_x64[i] / 2^64  − reward_debts[i]

// v6
const [farmAuthorityV6] = PublicKey.findProgramAddressSync(
  [farmId.toBuffer()],
  FARM_V6_PROGRAM_ID,
);

// v5
const [farmAuthorityV5] = PublicKey.findProgramAddressSync(
  [farmId.toBuffer()],
  FARM_V5_PROGRAM_ID,
);

// v3
const [farmAuthorityV3] = PublicKey.findProgramAddressSync(
  [farmId.toBuffer()],
  FARM_V3_PROGRAM_ID,
);

annualized_rewards_value_usd = reward_per_second × 86400 × 365 × reward_usd_price
tvl_usd                     = total_staked / 10^decimals × staking_mint_usd_price
apr                         = annualized_rewards_value_usd / tvl_usd