스마트 컨트랙트 통합

use ephemeral_rollups_sdk::anchor::{commit, delegate, ephemeral};
use ephemeral_rollups_sdk::cpi::DelegateConfig;
use ephemeral_rollups_sdk::ephem::MagicIntentBundleBuilder;

#[ephemeral]
#[program]
pub mod your_program {
    use super::*;
    // ...
}

// The eATA is owned by your custody PDA (e.g. a Pool), derived under the
// Ephemeral SPL Token program from [owner, mint].
let (eata, _bump) = Pubkey::find_program_address(
    &[owner.as_ref(), mint.as_ref()],
    &EPHEMERAL_SPL_TOKEN_PROGRAM_ID,
);

// At initialize, create the eATA (InitializeEphemeralAta) and the per-mint
// global vault that backs every eATA (InitializeGlobalVault), then fund it.

// Delegate the eATA with a CPI to the Ephemeral SPL Token program.
// An optional trailing validator pubkey routes to a specific validator.
let mut data = vec![4]; // DelegateEphemeralAta
if let Some(validator) = validator {
    data.extend_from_slice(validator.as_ref());
}

let instruction = Instruction {
    program_id: EPHEMERAL_SPL_TOKEN_PROGRAM_ID,
    accounts: vec![
        AccountMeta::new(payer.key(), true),
        AccountMeta::new(ephemeral_ata.key(), false),
        AccountMeta::new_readonly(EPHEMERAL_SPL_TOKEN_PROGRAM_ID, false),
        AccountMeta::new(buffer.key(), false),
        AccountMeta::new(record.key(), false),
        AccountMeta::new(metadata.key(), false),
        AccountMeta::new_readonly(delegation_program.key(), false),
        AccountMeta::new_readonly(system_program.key(), false),
    ],
    data,
};
invoke(&instruction, &account_infos)?;

use anchor_spl::token::{self, Transfer as SplTransfer};

// The custody PDA signs the transfer — no user signature required.
let bump_seed = [pool_bump];
let signer_seeds: &[&[&[u8]]] = &[&[POOL_SEED, &bump_seed]];

let cpi_accounts = SplTransfer {
    from,
    to,
    authority: pool, // the Pool PDA
};
let cpi_ctx = CpiContext::new_with_signer(token_program.to_account_info(), cpi_accounts, signer_seeds);
token::transfer(cpi_ctx, amount)?;

// The #[commit] attribute on the accounts context supplies
// magic_context and magic_program.
MagicIntentBundleBuilder::new(
    ctx.accounts.payer.to_account_info(),
    ctx.accounts.magic_context.to_account_info(),
    ctx.accounts.magic_program.to_account_info(),
)
.commit_and_undelegate(&[ctx.accounts.pool.to_account_info()])
.build_and_invoke()?;