bucks-api 0.2.0

use solana_program::pubkey::Pubkey;
use spl_associated_token_account::get_associated_token_address;
use steel::*;

use crate::{consts::*, instruction::*, state::*};

// =============================================================================
// Protocol Account Helpers
// =============================================================================

/// Returns the accounts needed for Kamino protocol operations.
pub fn kamino_accounts(vault_address: Pubkey) -> Vec<AccountMeta> {
    let vault_ctoken_address = get_associated_token_address(&vault_address, &CTOKEN_ADDRESS);

    vec![
        AccountMeta::new(vault_address, false),
        AccountMeta::new(OBLIGATION_ADDRESS, false),
        AccountMeta::new(LENDING_MARKET_ADDRESS, false),
        AccountMeta::new(LENDING_MARKET_AUTHORITY_ADDRESS, false),
        AccountMeta::new(RESERVE_ADDRESS, false),
        AccountMeta::new(USDC_ADDRESS, false),
        AccountMeta::new(RESERVE_LIQUIDITY_SUPPLY_ADDRESS, false),
        AccountMeta::new(CTOKEN_ADDRESS, false),
        AccountMeta::new(RESERVE_CTOKEN_ADDRESS, false),
        AccountMeta::new(get_associated_token_address(&vault_address, &USDC_ADDRESS), false),
        AccountMeta::new(vault_ctoken_address, false),
        AccountMeta::new_readonly(spl_token::ID, false),
        AccountMeta::new_readonly(spl_token::ID, false),
        AccountMeta::new_readonly(sysvar::instructions::ID, false),
        AccountMeta::new(RESERVE_FARM_USER_STATE_ADDRESS, false),
        AccountMeta::new(RESERVE_FARM_STATE_ADDRESS, false),
        AccountMeta::new_readonly(KFARMS_PROGRAM_ID, false),
        AccountMeta::new_readonly(SCOPE_PRICES_ADDRESS, false),
        AccountMeta::new_readonly(KLEND_PROGRAM_ID, false),
    ]
}

/// Returns the accounts needed for Perena protocol operations.
/// Matches the bankineco IDL structure for mint_w_yielding_gen / burn_for_yielding_gen.
pub fn perena_accounts(vault_address: Pubkey) -> Vec<AccountMeta> {
    let vault_usdc_address = get_associated_token_address(&vault_address, &USDC_ADDRESS);
    let vault_usd_star_address = get_associated_token_address(&vault_address, &USD_STAR_MINT);

    vec![
        // 0. vault_info (signer) - the "user" in Perena terms (our vault PDA)
        AccountMeta::new(vault_address, false),
        // 1. bank_state
        AccountMeta::new(PERENA_BANK_STATE, false),
        // 2. vault_state (Perena's vault state, not our vault)
        AccountMeta::new(PERENA_VAULT_STATE, false),
        // 3. oracle_state
        AccountMeta::new_readonly(PERENA_ORACLE_STATE, false),
        // 4. yielding_mint (USDC)
        AccountMeta::new_readonly(USDC_ADDRESS, false),
        // 5. bank_mint (USD*)
        AccountMeta::new(USD_STAR_MINT, false),
        // 6. vault_usdc_ata (user's USDC ATA - our vault's USDC)
        AccountMeta::new(vault_usdc_address, false),
        // 7. vault_usd_star_ata (user's USD* ATA - our vault's USD*)
        AccountMeta::new(vault_usd_star_address, false),
        // 8. yielding_vault_ata (Perena's USDC vault)
        AccountMeta::new(PERENA_YIELDING_VAULT, false),
        // 9. team_state
        AccountMeta::new(PERENA_TEAM_STATE, false),
        // 10. fee_team_ata
        AccountMeta::new(PERENA_FEE_TEAM_ATA, false),
        // 11. system_program
        AccountMeta::new_readonly(system_program::ID, false),
        // 12. token_program
        AccountMeta::new_readonly(spl_token::ID, false),
        // 13. yielding_mint_program (USDC token program)
        AccountMeta::new_readonly(spl_token::ID, false),
        // 14. associated_token_program
        AccountMeta::new_readonly(spl_associated_token_account::ID, false),
        // 15. perena_program
        AccountMeta::new_readonly(PERENA_PROGRAM_ID, false),
    ]
}

/// Returns protocol accounts based on protocol ID.
pub fn protocol_accounts(protocol_id: u8, vault_address: Pubkey) -> Vec<AccountMeta> {
    match protocol_id {
        PROTOCOL_KAMINO => kamino_accounts(vault_address),
        PROTOCOL_PERENA => perena_accounts(vault_address),
        _ => vec![],
    }
}

// =============================================================================
// Log Helpers
// =============================================================================

/// Build a Log instruction (for CPI from within the program).
pub fn log(signer: Pubkey, msg: &[u8]) -> Instruction {
    let mut data = Log {}.to_bytes();
    data.extend_from_slice(msg);
    Instruction {
        program_id: crate::ID,
        accounts: vec![AccountMeta::new(signer, true)],
        data,
    }
}

/// CPI call to emit a log event. The vault PDA signs.
pub fn program_log(accounts: &[AccountInfo], msg: &[u8]) -> Result<(), ProgramError> {
    invoke_signed(
        &log(*accounts[0].key, msg),
        accounts,
        &crate::ID,
        &[VAULT],
    )
}

// =============================================================================
// Admin Instructions
// =============================================================================

/// Initialize the vault with fee parameters and treasury.
pub fn init(signer: Pubkey, platform_fee_bps: u16, treasury: Pubkey) -> Instruction {
    let vault_address = vault_pda().0;
    let vault_usdc_address = get_associated_token_address(&vault_address, &USDC_ADDRESS);

    Instruction {
        program_id: crate::ID,
        accounts: vec![
            AccountMeta::new(signer, true),
            AccountMeta::new_readonly(USDC_ADDRESS, false),
            AccountMeta::new(vault_address, false),
            AccountMeta::new(vault_usdc_address, false),
            AccountMeta::new_readonly(system_program::ID, false),
            AccountMeta::new_readonly(spl_token::ID, false),
            AccountMeta::new_readonly(spl_associated_token_account::ID, false),
        ],
        data: Init {
            platform_fee_bps: platform_fee_bps.to_le_bytes(),
            _padding: [0u8; 6],
            treasury: treasury.to_bytes(),
        }
        .to_bytes(),
    }
}

/// Initialize a protocol registry.
pub fn init_protocol(signer: Pubkey, protocol_id: u8, name: &str, user_lookup_table: Option<Pubkey>) -> Instruction {
    let vault_address = vault_pda().0;
    let protocol_address = protocol_pda(protocol_id).0;

    // Get receipt token mint based on protocol.
    let receipt_token_mint = match protocol_id {
        PROTOCOL_KAMINO => CTOKEN_ADDRESS,
        PROTOCOL_PERENA => USD_STAR_MINT,
        _ => panic!("Unknown protocol"),
    };

    let vault_receipt_token_address = get_associated_token_address(&vault_address, &receipt_token_mint);

    // Convert name to bytes.
    let name_bytes = name.as_bytes();
    let mut name_array = [0u8; 32];
    let len = name_bytes.len().min(32);
    name_array[..len].copy_from_slice(&name_bytes[..len]);

    let mut accounts = vec![
        AccountMeta::new(signer, true),
        AccountMeta::new(vault_address, false),
        AccountMeta::new(protocol_address, false),
        AccountMeta::new_readonly(receipt_token_mint, false),
        AccountMeta::new(vault_receipt_token_address, false),
        AccountMeta::new_readonly(system_program::ID, false),
        AccountMeta::new_readonly(spl_token::ID, false),
        AccountMeta::new_readonly(spl_associated_token_account::ID, false),
    ];

    // Add protocol-specific accounts.
    if protocol_id == PROTOCOL_KAMINO {
        let user_metadata_address = Pubkey::find_program_address(
            &[b"user_meta", vault_address.as_ref()],
            &klend_sdk::programs::KAMINO_LENDING_ID.to_bytes().into(),
        )
        .0;

        accounts.extend(vec![
            AccountMeta::new(OBLIGATION_ADDRESS, false),
            AccountMeta::new(LENDING_MARKET_ADDRESS, false),
            AccountMeta::new_readonly(USDC_ADDRESS, false),
            AccountMeta::new_readonly(USDC_ADDRESS, false),
            AccountMeta::new(user_metadata_address, false),
            AccountMeta::new(user_lookup_table.unwrap_or(signer), false),
            AccountMeta::new(LENDING_MARKET_AUTHORITY_ADDRESS, false),
            AccountMeta::new(RESERVE_ADDRESS, false),
            AccountMeta::new(RESERVE_FARM_USER_STATE_ADDRESS, false),
            AccountMeta::new(RESERVE_FARM_STATE_ADDRESS, false),
            AccountMeta::new_readonly(KFARMS_PROGRAM_ID, false),
            AccountMeta::new_readonly(KLEND_PROGRAM_ID, false),
            AccountMeta::new_readonly(sysvar::rent::ID, false),
            AccountMeta::new_readonly(system_program::ID, false),
        ]);
    }

    Instruction {
        program_id: crate::ID,
        accounts,
        data: InitProtocol {
            protocol_id,
            name: name_array,
        }
        .to_bytes(),
    }
}

/// Checkpoint a protocol's exchange rate.
pub fn checkpoint(signer: Pubkey, protocol_id: u8) -> Instruction {
    let vault_address = vault_pda().0;
    let protocol_address = protocol_pda(protocol_id).0;

    let mut accounts = vec![
        AccountMeta::new(signer, true),
        AccountMeta::new(vault_address, false),
        AccountMeta::new(protocol_address, false),
    ];

    // Add protocol-specific read accounts for getting exchange rate.
    match protocol_id {
        PROTOCOL_KAMINO => {
            accounts.push(AccountMeta::new_readonly(RESERVE_ADDRESS, false));
        }
        PROTOCOL_PERENA => {
            accounts.push(AccountMeta::new_readonly(PERENA_ORACLE_STATE, false));
        }
        _ => {}
    }

    Instruction {
        program_id: crate::ID,
        accounts,
        data: Checkpoint { protocol_id }.to_bytes(),
    }
}

/// Rebalance a single stable's position from one protocol to another.
///
/// This is a per-stable operation. To rebalance the entire pool, call this
/// for each stable that has funds in the source protocol. Can be parallelized
/// via Jito bundles.
pub fn rebalance(
    signer: Pubkey,
    stable_address: Pubkey,
    from_protocol: u8,
    to_protocol: u8,
    amount: u64,
) -> Instruction {
    let vault_address = vault_pda().0;
    let vault_usdc_address = get_associated_token_address(&vault_address, &USDC_ADDRESS);
    let from_protocol_address = protocol_pda(from_protocol).0;
    let to_protocol_address = protocol_pda(to_protocol).0;
    let from_position_address = position_pda(stable_address, from_protocol).0;
    let to_position_address = position_pda(stable_address, to_protocol).0;

    let mut accounts = vec![
        AccountMeta::new(signer, true),
        AccountMeta::new(vault_address, false),
        AccountMeta::new(stable_address, false),
        AccountMeta::new(from_protocol_address, false),
        AccountMeta::new(to_protocol_address, false),
        AccountMeta::new(from_position_address, false),
        AccountMeta::new(to_position_address, false),
        AccountMeta::new(vault_usdc_address, false),
        AccountMeta::new_readonly(system_program::ID, false),
        AccountMeta::new_readonly(spl_token::ID, false),
    ];

    // Add from protocol accounts.
    accounts.extend(protocol_accounts(from_protocol, vault_address));
    // Add to protocol accounts.
    accounts.extend(protocol_accounts(to_protocol, vault_address));

    Instruction {
        program_id: crate::ID,
        accounts,
        data: Rebalance {
            from_protocol,
            to_protocol,
            _padding: [0u8; 6],
            amount: amount.to_le_bytes(),
        }
        .to_bytes(),
    }
}

/// Set the primary protocol for new deposits.
pub fn set_primary_protocol(signer: Pubkey, protocol_id: u8) -> Instruction {
    let vault_address = vault_pda().0;
    let protocol_address = protocol_pda(protocol_id).0;

    Instruction {
        program_id: crate::ID,
        accounts: vec![
            AccountMeta::new(signer, true),
            AccountMeta::new(vault_address, false),
            AccountMeta::new_readonly(protocol_address, false),
        ],
        data: SetPrimaryProtocol { protocol_id }.to_bytes(),
    }
}

/// Pause or unpause the vault.
pub fn set_paused(signer: Pubkey, paused: bool) -> Instruction {
    let vault_address = vault_pda().0;

    Instruction {
        program_id: crate::ID,
        accounts: vec![
            AccountMeta::new(signer, true),
            AccountMeta::new(vault_address, false),
        ],
        data: SetPaused {
            paused: if paused { 1 } else { 0 },
        }
        .to_bytes(),
    }
}

/// Collect platform fees from a position.
/// Admin can call this to collect the protocol's share of yield from any position.
pub fn collect_platform_fee(
    signer: Pubkey,
    treasury: Pubkey,
    stable_address: Pubkey,
    protocol_id: u8,
) -> Instruction {
    let vault_address = vault_pda().0;
    let vault_usdc_address = get_associated_token_address(&vault_address, &USDC_ADDRESS);
    let protocol_address = protocol_pda(protocol_id).0;
    let position_address = position_pda(stable_address, protocol_id).0;

    let mut accounts = vec![
        AccountMeta::new(signer, true),
        AccountMeta::new(vault_address, false),
        AccountMeta::new(treasury, false),
        AccountMeta::new(vault_usdc_address, false),
        AccountMeta::new_readonly(stable_address, false),
        AccountMeta::new(protocol_address, false),
        AccountMeta::new(position_address, false),
        AccountMeta::new_readonly(spl_token::ID, false),
    ];

    // Add protocol-specific accounts for withdrawal.
    accounts.extend(protocol_accounts(protocol_id, vault_address));

    Instruction {
        program_id: crate::ID,
        accounts,
        data: CollectPlatformFee { protocol_id }.to_bytes(),
    }
}

/// Set the treasury address for platform fee collection.
pub fn set_treasury(signer: Pubkey, treasury: Pubkey) -> Instruction {
    let vault_address = vault_pda().0;

    Instruction {
        program_id: crate::ID,
        accounts: vec![
            AccountMeta::new(signer, true),
            AccountMeta::new(vault_address, false),
            AccountMeta::new_readonly(treasury, false),
        ],
        data: SetTreasury {
            treasury: treasury.to_bytes(),
        }
        .to_bytes(),
    }
}

/// Delete the vault account (for re-initialization after schema changes).
/// WARNING: This is destructive and should only be used during development/testing.
pub fn delete_vault(signer: Pubkey) -> Instruction {
    let vault_address = vault_pda().0;

    Instruction {
        program_id: crate::ID,
        accounts: vec![
            AccountMeta::new(signer, true),
            AccountMeta::new(vault_address, false),
        ],
        data: DeleteVault {}.to_bytes(),
    }
}

// =============================================================================
// Creator Instructions
// =============================================================================

/// Create a new stablecoin.
pub fn create(
    signer: Pubkey,
    payer: Pubkey,
    id: String,
    name: String,
    symbol: String,
    noise: [u8; 32],
) -> Instruction {
    // Convert `id` into [u8; 32].
    let id_bytes = id.as_bytes();
    if id_bytes.len() > 32 {
        panic!("Id must be at most 32 bytes");
    }
    let mut id_array = [0u8; 32];
    id_array[..id_bytes.len()].copy_from_slice(id_bytes);

    // Convert `symbol` into [u8; 32].
    let symbol_bytes = symbol.as_bytes();
    if symbol_bytes.len() > 32 {
        panic!("Symbol must be at most 32 bytes");
    }
    let mut symbol_array = [0u8; 32];
    symbol_array[..symbol_bytes.len()].copy_from_slice(symbol_bytes);

    // Convert `name` into [u8; 32].
    let name_bytes = name.as_bytes();
    if name_bytes.len() > 32 {
        panic!("Name must be at most 32 bytes");
    }
    let mut name_array = [0u8; 32];
    name_array[..name_bytes.len()].copy_from_slice(name_bytes);

    let mint_pda =
        Pubkey::find_program_address(&[MINT, noise.as_ref()], &crate::ID.to_bytes().into());

    let metadata_address = mpl_token_metadata::accounts::Metadata::find_pda(&mint_pda.0).0;
    let stable_address = stable_pda(mint_pda.0).0;

    Instruction {
        program_id: crate::ID,
        accounts: vec![
            AccountMeta::new(signer, true),
            AccountMeta::new(payer, true),
            AccountMeta::new(metadata_address, false),
            AccountMeta::new(stable_address, false),
            AccountMeta::new(mint_pda.0, false),
            AccountMeta::new_readonly(system_program::ID, false),
            AccountMeta::new_readonly(spl_token::ID, false),
            AccountMeta::new_readonly(spl_associated_token_account::ID, false),
            AccountMeta::new_readonly(mpl_token_metadata::ID, false),
            AccountMeta::new_readonly(sysvar::rent::ID, false),
        ],
        data: Create {
            id: id_array,
            name: name_array,
            symbol: symbol_array,
            noise,
            bump: mint_pda.1,
        }
        .to_bytes(),
    }
}

/// Update stablecoin authority.
pub fn update_authority(signer: Pubkey, mint_stable: Pubkey, new_authority: Pubkey) -> Instruction {
    let stable_address = stable_pda(mint_stable).0;

    Instruction {
        program_id: crate::ID,
        accounts: vec![
            AccountMeta::new(signer, true),
            AccountMeta::new(stable_address, false),
        ],
        data: UpdateAuthority {
            new_authority: new_authority.to_bytes(),
        }
        .to_bytes(),
    }
}

/// Claim yield from a stablecoin's position in a specific protocol.
pub fn claim(signer: Pubkey, mint_stable: Pubkey, protocol_id: u8, amount: u64, min_usdc_out: u64) -> Instruction {
    let stable_address = stable_pda(mint_stable).0;
    let signer_stable_address = get_associated_token_address(&signer, &mint_stable);
    let signer_usdc_address = get_associated_token_address(&signer, &USDC_ADDRESS);
    let vault_address = vault_pda().0;
    let vault_usdc_address = get_associated_token_address(&vault_address, &USDC_ADDRESS);
    let protocol_address = protocol_pda(protocol_id).0;
    let position_address = position_pda(stable_address, protocol_id).0;

    let mut accounts = vec![
        AccountMeta::new(signer, true),
        AccountMeta::new(signer, true),
        AccountMeta::new(signer_stable_address, false),
        AccountMeta::new(signer_usdc_address, false),
        AccountMeta::new_readonly(USDC_ADDRESS, false),
        AccountMeta::new(mint_stable, false),
        AccountMeta::new(stable_address, false),
        AccountMeta::new(vault_address, false),
        AccountMeta::new(vault_usdc_address, false),
        AccountMeta::new(protocol_address, false),
        AccountMeta::new(position_address, false),
        AccountMeta::new_readonly(system_program::ID, false),
        AccountMeta::new_readonly(spl_token::ID, false),
        AccountMeta::new_readonly(spl_associated_token_account::ID, false),
        AccountMeta::new_readonly(sysvar::instructions::ID, false),
        AccountMeta::new_readonly(crate::ID, false),
    ];

    // Add protocol-specific accounts.
    accounts.extend(protocol_accounts(protocol_id, vault_address));

    Instruction {
        program_id: crate::ID,
        accounts,
        data: Claim {
            amount: amount.to_le_bytes(),
            min_usdc_out: min_usdc_out.to_le_bytes(),
        }
        .to_bytes(),
    }
}

// =============================================================================
// User Instructions
// =============================================================================

/// Wrap USDC into stablecoin.
/// Creates the position account if it doesn't exist.
pub fn wrap(signer: Pubkey, mint_stable: Pubkey, protocol_id: u8, amount: u64) -> Instruction {
    let stable_address = stable_pda(mint_stable).0;
    let signer_stable_address = get_associated_token_address(&signer, &mint_stable);
    let signer_usdc_address = get_associated_token_address(&signer, &USDC_ADDRESS);
    let vault_address = vault_pda().0;
    let vault_usdc_address = get_associated_token_address(&vault_address, &USDC_ADDRESS);
    let protocol_address = protocol_pda(protocol_id).0;
    let position_address = position_pda(stable_address, protocol_id).0;

    let mut accounts = vec![
        AccountMeta::new(signer, true),
        AccountMeta::new(signer, true),
        AccountMeta::new(signer_stable_address, false),
        AccountMeta::new(signer_usdc_address, false),
        AccountMeta::new_readonly(USDC_ADDRESS, false),
        AccountMeta::new(mint_stable, false),
        AccountMeta::new(stable_address, false),
        AccountMeta::new(vault_address, false),
        AccountMeta::new(vault_usdc_address, false),
        AccountMeta::new(protocol_address, false),
        AccountMeta::new(position_address, false),
        AccountMeta::new_readonly(system_program::ID, false),
        AccountMeta::new_readonly(spl_token::ID, false),
        AccountMeta::new_readonly(spl_associated_token_account::ID, false),
        AccountMeta::new_readonly(sysvar::instructions::ID, false),
        AccountMeta::new_readonly(crate::ID, false),
    ];

    // Add protocol-specific accounts.
    accounts.extend(protocol_accounts(protocol_id, vault_address));

    Instruction {
        program_id: crate::ID,
        accounts,
        data: Wrap {
            amount: amount.to_le_bytes(),
        }
        .to_bytes(),
    }
}

/// Unwrap stablecoin to USDC from a single protocol.
/// For large withdrawals spanning multiple protocols, use `build_unwrap_bundle`.
/// Position must exist (created during wrap).
pub fn unwrap(signer: Pubkey, mint_stable: Pubkey, protocol_id: u8, amount: u64, min_usdc_out: u64) -> Instruction {
    let stable_address = stable_pda(mint_stable).0;
    let signer_stable_address = get_associated_token_address(&signer, &mint_stable);
    let signer_usdc_address = get_associated_token_address(&signer, &USDC_ADDRESS);
    let vault_address = vault_pda().0;
    let vault_usdc_address = get_associated_token_address(&vault_address, &USDC_ADDRESS);
    let protocol_address = protocol_pda(protocol_id).0;
    let position_address = position_pda(stable_address, protocol_id).0;

    let mut accounts = vec![
        AccountMeta::new(signer, true),
        AccountMeta::new(signer, true),
        AccountMeta::new(signer_stable_address, false),
        AccountMeta::new(signer_usdc_address, false),
        AccountMeta::new_readonly(USDC_ADDRESS, false),
        AccountMeta::new(mint_stable, false),
        AccountMeta::new(stable_address, false),
        AccountMeta::new(vault_address, false),
        AccountMeta::new(vault_usdc_address, false),
        AccountMeta::new(protocol_address, false),
        AccountMeta::new(position_address, false),
        AccountMeta::new_readonly(system_program::ID, false),
        AccountMeta::new_readonly(spl_token::ID, false),
        AccountMeta::new_readonly(spl_associated_token_account::ID, false),
        AccountMeta::new_readonly(sysvar::instructions::ID, false),
        AccountMeta::new_readonly(crate::ID, false),
    ];

    // Add protocol-specific accounts.
    accounts.extend(protocol_accounts(protocol_id, vault_address));

    Instruction {
        program_id: crate::ID,
        accounts,
        data: Unwrap {
            amount: amount.to_le_bytes(),
            min_usdc_out: min_usdc_out.to_le_bytes(),
        }
        .to_bytes(),
    }
}

// =============================================================================
// Bundle Helpers
// =============================================================================

/// Protocol allocation info for building unwrap bundles.
pub struct ProtocolAllocation {
    /// Protocol ID.
    pub protocol_id: u8,
    /// Amount of USDC available in this protocol.
    pub usdc_available: u64,
}

/// Builds a bundle of unwrap instructions for withdrawing across multiple protocols.
///
/// For large withdrawals that span multiple protocols, this function calculates
/// the optimal split and returns multiple instructions that should be submitted
/// as a Jito bundle for atomic execution.
///
/// # Arguments
/// * `signer` - The user's wallet address
/// * `mint_stable` - The stablecoin mint address
/// * `amount` - Total amount of stablecoins to unwrap
/// * `protocols` - List of protocols with their available USDC balances
///
/// # Returns
/// A vector of instructions, one per protocol that needs to be withdrawn from.
/// Submit these as a Jito bundle for atomic execution.
///
/// # Example
/// ```ignore
/// let protocols = vec![
///     ProtocolAllocation { protocol_id: PROTOCOL_KAMINO, usdc_available: 1000_000000 },
///     ProtocolAllocation { protocol_id: PROTOCOL_PERENA, usdc_available: 500_000000 },
/// ];
/// let bundle = build_unwrap_bundle(signer, mint, 1200_000000, &protocols);
/// // bundle[0] = unwrap 1000 USDC from Kamino
/// // bundle[1] = unwrap 200 USDC from Perena
/// ```
pub fn build_unwrap_bundle(
    _signer: Pubkey,
    _mint_stable: Pubkey,
    _amount: u64,
    _protocols: &[ProtocolAllocation],
) -> Vec<Instruction> {
    // TODO: Implement bundle building logic
    //
    // 1. Sort protocols by available USDC (descending) for optimal withdrawal
    // 2. Calculate how much to withdraw from each protocol:
    //    - Start with the protocol with most funds
    //    - Take min(remaining_amount, protocol.usdc_available)
    //    - Move to next protocol if more needed
    // 3. Build one unwrap instruction per protocol
    // 4. Return the vector of instructions
    //
    // The caller should submit these instructions as a Jito bundle
    // to ensure atomic execution across all protocols.
    todo!("Implement multi-protocol unwrap bundle builder")
}