import crypto from 'crypto';

const BASE = 'https://web3.okx.com';

// Signature rule:
//   GET  → body = "", requestPath includes query string (e.g., "/api/v6/dex/balance/all-token-balances-by-address?address=0x...&chains=1,56")
//   POST → body = JSON string of request body, requestPath is path only (e.g., "/api/v6/dex/balance/token-balances-by-address")
async function okxFetch(method: 'GET' | 'POST', path: string, body?: object) {
  const timestamp = new Date().toISOString();
  const bodyStr = body ? JSON.stringify(body) : '';
  const sign = crypto
    .createHmac('sha256', process.env.OKX_SECRET_KEY!)
    .update(timestamp + method + path + bodyStr)
    .digest('base64');
  const headers: Record<string, string> = {
    'OK-ACCESS-KEY': process.env.OKX_API_KEY!,
    'OK-ACCESS-SIGN': sign,
    'OK-ACCESS-PASSPHRASE': process.env.OKX_PASSPHRASE!,
    'OK-ACCESS-TIMESTAMP': timestamp,
    'Content-Type': 'application/json',
  };
  const res = await fetch(`${BASE}${path}`, {
    method,
    headers,
    ...(body && { body: bodyStr }),
  });
  if (res.status === 429) throw { code: 'RATE_LIMITED', msg: 'Rate limited — retry with backoff', retryable: true };
  if (res.status >= 500) throw { code: `HTTP_${res.status}`, msg: 'Server error', retryable: true };
  const json = await res.json();
  if (json.code !== '0') throw { code: json.code, msg: json.msg || 'API error', retryable: false };
  return json.data;
}

// Get all token balances (GET)
const balances = await okxFetch('GET', '/api/v6/dex/balance/all-token-balances-by-address?' + new URLSearchParams({
  address: '0xYourWallet', chains: '1,56,137',
}));
// → balances[].tokenAssets[]: { symbol, balance (UI units), tokenPrice, rawBalance }

// Check specific tokens (POST)
const specific = await okxFetch('POST', '/api/v6/dex/balance/token-balances-by-address', {
  address: '0xYourWallet',
  tokenContractAddresses: [
    { chainIndex: '1', tokenContractAddress: '' },  // native ETH
    { chainIndex: '1', tokenContractAddress: '0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48' },  // USDC
  ],
});

1. okx-dex-token   /market/token/search?search=BONK                     → get tokenContractAddress
2. okx-wallet-portfolio /balance/all-token-balances-by-address                → verify SOL balance >= 1
       ↓ balance field (UI units) → convert to minimal units for swap
3. okx-dex-swap    /aggregator/quote                                     → get quote
4. okx-dex-swap    /aggregator/swap-instruction                          → execute (Solana)

1. okx-wallet-portfolio /balance/total-value-by-address                        → total USD value
2. okx-wallet-portfolio /balance/all-token-balances-by-address                 → per-token breakdown
       ↓ top holdings by USD value
3. okx-dex-token   /market/price-info                                     → enrich with 24h change, market cap, liquidity
4. okx-dex-market  /market/candles (optional)                             → price charts for tokens of interest

1. okx-wallet-portfolio /balance/all-token-balances-by-address                 → list all holdings
       ↓ tokenContractAddress + chainIndex for each
2. okx-dex-token   /market/price-info                                     → get priceChange24H per token
3. Filter by negative change → user confirms which to sell
4. okx-dex-swap    /aggregator/quote → /aggregator/swap → execute sell

{ "code": "0", "data": [{ "name": "Ethereum", "logoUrl": "...", "shortName": "ETH", "chainIndex": "1" }], "msg": "" }

{ "code": "0", "data": [{ "totalValue": "1172.895057177065864522" }], "msg": "success" }

{
  "code": "0",
  "data": [{
    "tokenAssets": [{
      "chainIndex": "1", "tokenContractAddress": "0x2260fac5e5542a773aa44fbcfedf7c193bc2c599",
      "symbol": "WBTC", "balance": "0.5", "rawBalance": "50000000",
      "tokenPrice": "65000.00", "isRiskToken": false,
      "address": "0xEd0C6079229E2d407672a117c22b62064f4a4312"
    }]
  }],
  "msg": "success"
}

{
  "code": "0",
  "data": [{
    "tokenAssets": [{
      "chainIndex": "1", "tokenContractAddress": "",
      "symbol": "eth", "balance": "1.5", "tokenPrice": "3640.43",
      "isRiskToken": false, "rawBalance": "1500000000000000000", "address": "0x..."
    }]
  }],
  "msg": "success"
}

GET /api/v6/dex/balance/total-value-by-address?address=0xabc...&chains=1,56
-> Display: Total assets $12,345.67

GET /api/v6/dex/balance/all-token-balances-by-address?address=0xabc...&chains=1,56
-> Display:
  ETH:  1.5 ($4,500.00)
  USDC: 2,000 ($2,000.00)
  BNB:  3.2 ($1,920.00)
  ...

POST /api/v6/dex/balance/token-balances-by-address
Body: {
  "address": "0xabc...",
  "tokenContractAddresses": [
    { "chainIndex": "1", "tokenContractAddress": "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48" },
    { "chainIndex": "1", "tokenContractAddress": "0xdac17f958d2ee523a2206206994597c13d831ec7" }
  ]
}
-> Display: USDC: 2,000 ($2,000.00), USDT: 1,500 ($1,500.00)