cdk 0.16.0

//! HTLC (NUT-14) tests for melt functionality
//!
//! These tests verify that the mint correctly validates HTLC spending conditions
//! during melt operations, including:
//! - Hash preimage verification
//! - Signature validation

use cdk_common::dhke::construct_proofs;
use cdk_common::melt::MeltQuoteRequest;
use cdk_common::nuts::{Conditions, SigFlag, SpendingConditions};
use cdk_common::Amount;

use crate::test_helpers::nut10::{
    create_test_hash_and_preimage, create_test_keypair, unzip3, TestMintHelper,
};

/// Test: HTLC requiring preimage and one signature
///
/// Creates HTLC-locked proofs and verifies:
/// 1. Melting with only preimage fails (signature required)
/// 2. Melting with only signature fails (preimage required)
/// 3. Melting with both preimage and signature succeeds
#[tokio::test]
async fn test_htlc_requiring_preimage_and_one_signature() {
    let test_mint = TestMintHelper::new().await.unwrap();
    let mint = test_mint.mint();

    // Generate keypair for Alice
    let (alice_secret, alice_pubkey) = create_test_keypair();

    // Create hash and preimage
    let (hash, preimage) = create_test_hash_and_preimage();

    println!("Alice pubkey: {}", alice_pubkey);
    println!("Hash: {}", hash);
    println!("Preimage: {}", preimage);

    // Step 1: Mint regular proofs (enough to cover the invoice amount + fees)
    // Invoice is 10 sats, fee reserve is 100% (10 sats), so we need 20 sats total
    let input_amount = Amount::from(20);
    let input_proofs = test_mint.mint_proofs(input_amount).await.unwrap();

    // Step 2: Create HTLC spending conditions (hash locked to Alice's key)
    let spending_conditions = SpendingConditions::new_htlc_hash(
        &hash,
        Some(Conditions {
            locktime: None,
            pubkeys: Some(vec![alice_pubkey]),
            refund_keys: None,
            num_sigs: None, // Default (1)
            sig_flag: SigFlag::default(),
            num_sigs_refund: None,
        }),
    )
    .unwrap();
    println!("Created HTLC spending conditions");

    // Step 3: Create HTLC blinded messages (outputs)
    let split_amounts = test_mint.split_amount(input_amount).unwrap();
    let split_display: Vec<String> = split_amounts.iter().map(|a| a.to_string()).collect();
    println!("Split {} into [{}]", input_amount, split_display.join("+"));

    let (htlc_outputs, blinding_factors, secrets) = unzip3(
        split_amounts
            .iter()
            .map(|&amt| test_mint.create_blinded_message(amt, &spending_conditions))
            .collect(),
    );
    println!(
        "Created {} HTLC outputs locked to alice with hash",
        htlc_outputs.len()
    );

    // Step 4: Swap regular proofs for HTLC proofs (no signature needed on inputs)
    let swap_request = cdk_common::SwapRequest::new(input_proofs.clone(), htlc_outputs.clone());
    let swap_response = mint
        .process_swap_request(swap_request)
        .await
        .expect("Failed to swap for HTLC proofs");
    println!("Swap successful! Got BlindSignatures for our HTLC outputs");

    // Step 5: Construct the HTLC proofs
    let htlc_proofs = construct_proofs(
        swap_response.signatures.clone(),
        blinding_factors.clone(),
        secrets.clone(),
        &test_mint.public_keys_of_the_active_sat_keyset,
    )
    .unwrap();

    let proof_amounts: Vec<String> = htlc_proofs.iter().map(|p| p.amount.to_string()).collect();
    println!(
        "Constructed {} HTLC proof(s) [{}]",
        htlc_proofs.len(),
        proof_amounts.join("+")
    );

    // Step 6: Create a real melt quote that we'll use for all tests
    use std::str::FromStr;

    use cdk_common::SpendingConditionVerification;
    let bolt11_str = "lnbc100n1pnvpufspp5djn8hrq49r8cghwye9kqw752qjncwyfnrprhprpqk43mwcy4yfsqdq5g9kxy7fqd9h8vmmfvdjscqzzsxqyz5vqsp5uhpjt36rj75pl7jq2sshaukzfkt7uulj456s4mh7uy7l6vx7lvxs9qxpqysgqedwz08acmqwtk8g4vkwm2w78suwt2qyzz6jkkwcgrjm3r3hs6fskyhvud4fan3keru7emjm8ygqpcrwtlmhfjfmer3afs5hhwamgr4cqtactdq";
    let bolt11 = cdk_common::Bolt11Invoice::from_str(bolt11_str).unwrap();

    let melt_quote_request = cdk_common::MeltQuoteBolt11Request {
        request: bolt11,
        unit: cdk_common::CurrencyUnit::Sat,
        options: None,
    };

    let melt_quote = mint
        .get_melt_quote(MeltQuoteRequest::Bolt11(melt_quote_request))
        .await
        .unwrap();
    println!("Created melt quote: {}", melt_quote.quote);

    // Step 7: Try to melt with only preimage (should fail - signature required)

    let mut proofs_preimage_only = htlc_proofs.clone();

    // Add only preimage (no signature)
    for proof in proofs_preimage_only.iter_mut() {
        proof.add_preimage(preimage.clone());
    }

    let melt_request_preimage_only =
        cdk_common::MeltRequest::new(melt_quote.quote.clone(), proofs_preimage_only, None);

    let result = melt_request_preimage_only.verify_spending_conditions();
    assert!(
        result.is_err(),
        "Should fail with only preimage (no signature)"
    );
    println!("✓ Melting with ONLY preimage failed verification as expected");

    // Also verify the actual melt fails
    let melt_result = mint.melt(&melt_request_preimage_only).await;
    assert!(
        melt_result.is_err(),
        "Actual melt should also fail with only preimage"
    );
    println!("✓ Actual melt with ONLY preimage also failed as expected");

    // Step 8: Try to melt with only signature (should fail - preimage required)
    let mut proofs_signature_only = htlc_proofs.clone();

    // Add only signature (no preimage)
    for proof in proofs_signature_only.iter_mut() {
        proof.sign_p2pk(alice_secret.clone()).unwrap();
    }

    let melt_request_signature_only =
        cdk_common::MeltRequest::new(melt_quote.quote.clone(), proofs_signature_only, None);

    let result = melt_request_signature_only.verify_spending_conditions();
    assert!(
        result.is_err(),
        "Should fail with only signature (no preimage)"
    );
    println!("✓ Melting with ONLY signature failed verification as expected");

    // Also verify the actual melt fails
    let melt_result = mint.melt(&melt_request_signature_only).await;
    assert!(
        melt_result.is_err(),
        "Actual melt should also fail with only signature"
    );
    println!("✓ Actual melt with ONLY signature also failed as expected");

    // Step 9: Now melt with correct preimage + signature
    let mut proofs_both = htlc_proofs.clone();

    // Add preimage and sign all proofs
    for proof in proofs_both.iter_mut() {
        proof.add_preimage(preimage.clone());
        proof.sign_p2pk(alice_secret.clone()).unwrap();
    }

    let melt_request = cdk_common::MeltRequest::new(melt_quote.quote.clone(), proofs_both, None);

    // Verify spending conditions pass
    melt_request.verify_spending_conditions().unwrap();
    println!("✓ HTLC spending conditions verified successfully");

    // Perform the actual melt - this also verifies spending conditions internally
    let melt_response = mint.melt(&melt_request).await.unwrap().await.unwrap();
    println!("✓ Melt operation completed successfully!");
    println!("  Quote state: {}", melt_response.state);
    assert_eq!(melt_response.quote, melt_quote.quote);
}