{
  "id": "composite_wrap_unwrap_cycle",
  "version": "1.0.0",
  "category": "composite_problems",
  "subcategory": "wrap_unwrap",
  "difficulty": "easy",
  "title": "Wrap BNB and Unwrap Back to BNB (Cycle Test)",
  "natural_language_templates": [
    "Wrap {amount} BNB to WBNB, then immediately unwrap all WBNB back to BNB",
    "Deposit {amount} BNB to WBNB and withdraw it back to BNB",
    "Convert {amount} BNB to WBNB, then convert it back to native BNB"
  ],
  "description": [
    "Test the WBNB wrap/unwrap functionality by wrapping BNB and immediately unwrapping it.",
    "",
    "This is a 2-step process:",
    "1. Deposit BNB to WBNB contract using deposit() function",
    "2. Withdraw WBNB back to BNB using withdraw(uint256) function",
    "",
    "Technical details:",
    "- WBNB contract address: 0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c",
    "- deposit() function: 0xd0e30db0 (payable)",
    "- withdraw(uint256) function: 0x2e1a7d4d",
    "",
    "Note: This is a test case to verify wrap/unwrap functionality works correctly.",
    "The key operation is wbnb_withdraw since the final goal is to get BNB back."
  ],
  "composite_structure": {
    "pattern": "wrap-unwrap",
    "optimal_steps": 2,
    "atomic_operations": [
      {
        "step": 1,
        "atomic_id": "wbnb_deposit",
        "role": "wrap_bnb",
        "description": "Wrap BNB to WBNB by calling deposit() on WBNB contract"
      },
      {
        "step": 2,
        "atomic_id": "wbnb_withdraw",
        "role": "key_operation",
        "description": "Withdraw WBNB to get native BNB back"
      }
    ]
  },
  "parameters": {
    "wbnb_address": {
      "type": "address",
      "role": "contract",
      "description": "WBNB contract address",
      "generation": {
        "method": "fixed",
        "value": "0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c"
      }
    },
    "amount": {
      "type": "number",
      "unit": "BNB",
      "description": "Amount of BNB to wrap and unwrap",
      "generation": {
        "method": "random",
        "min": 0.01,
        "max": 0.1,
        "decimals": 3
      },
      "role": "wrap_amount"
    }
  },
  "interaction_config": {
    "max_rounds": 4,
    "optimal_steps": 2,
    "score_decay_formula": "base_score * min(1.0, optimal_steps / actual_steps)",
    "forced_submit_at_max": true
  },
  "scoring_strategy": {
    "method": "atomic_validator_reuse",
    "key_operation_id": "wbnb_withdraw",
    "key_operation_step": 2
  },
  "validation": {
    "pre_conditions": [
      {
        "type": "bnb_balance",
        "description": "Agent must have sufficient BNB for wrap and gas",
        "min_balance": "1 BNB"
      }
    ],
    "post_conditions": [
      {
        "type": "transaction_success",
        "weight": 0.3,
        "description": "Withdraw transaction executed successfully"
      },
      {
        "type": "contract_called",
        "weight": 0.2,
        "address": "{wbnb_address}",
        "description": "Correct WBNB contract called"
      },
      {
        "type": "function_selector",
        "weight": 0.2,
        "selector": "0x2e1a7d4d",
        "description": "Correct function withdraw(uint256) called"
      },
      {
        "type": "bnb_balance_recovered",
        "weight": 0.3,
        "description": "BNB balance recovered (minus gas costs)"
      }
    ]
  },
  "metadata": {
    "tags": [
      "wrap-unwrap",
      "test",
      "wbnb",
      "cycle",
      "easy",
      "two-step"
    ],
    "estimated_gas": 120000,
    "requires_approval": false,
    "difficulty_notes": [
      "Simple two-step process",
      "Tests basic WBNB wrap/unwrap functionality",
      "No approval required"
    ]
  }
}