import axios from "axios";
import qs from "qs";
import { HttpsProxyAgent } from "https-proxy-agent";
import { AssetType, Chain, ClobClient, OrderType, Side, SignatureTypeV2 } from "@polymarket/clob-client-v2";
import { BuilderConfig } from "@polymarket/builder-signing-sdk";
import { deriveProxyWallet, RelayerTxType, RelayClient } from "@polymarket/builder-relayer-client";
import {
  createPublicClient,
  createWalletClient,
  encodeFunctionData,
  erc20Abi,
  formatUnits,
  http,
  parseUnits,
} from "viem";
import { privateKeyToAccount } from "viem/accounts";
import { polygon } from "viem/chains";

import WebSocketClient from "./webSocketClient.js";

import Logs from "./logs.js";

const NODE_HTTP_PROXY = process.env.NODE_HTTP_PROXY;
const proxyAgent = NODE_HTTP_PROXY ? new HttpsProxyAgent(NODE_HTTP_PROXY) : undefined;
if (NODE_HTTP_PROXY) {
  axios.defaults.proxy = false;
  axios.defaults.httpAgent = proxyAgent;
  axios.defaults.httpsAgent = proxyAgent;
}

const CHAIN_ID = 137;
const GAMMA_HOST = "https://gamma-api.polymarket.com";
const CLOB_HOST = "https://clob.polymarket.com";
const PUSD_ADDRESS = "0xC011a7E12a19f7B1f670d46F03B03f3342E82DFB";
const PUSD_DECIMALS = 6;
const PROXY_FACTORY_ADDRESS = "0xaB45c5A4B0c941a2F231C04C3f49182e1A254052";

/**
 * axios 默认配置
 */
const axiosDefaultOptions = {
  baseURL: "",
  url: "",
  method: "GET",
  headers: {},
  params: {},
  data: {},
  timeout: 10000,
};

/**
 * 通用请求
 * @param {*} options
 * @param {*} baseURL
 * @returns
 */
const clientRequest = async (options, baseURL) => {
  const { url } = options;
  if (!url || !baseURL) {
    throw new Error("url and baseURL are required");
  }
  const mergedOptions = {
    ...axiosDefaultOptions,
    ...options,
    baseURL,
    paramsSerializer: params => qs.stringify(params, { arrayFormat: 'repeat' })
  };
  return axios(mergedOptions).then(res => res.data);
}

/**
 * 请求市场数据
 * @param {*} options
 * @returns
 */
const requestMarketData = async (options) => {
  return clientRequest(options, GAMMA_HOST);
}

/**
 * 请求订单簿数据
 */
const requestClobData = async (options) => {
  return clientRequest(options, CLOB_HOST);
}

const getRequiredEnv = (key) => {
  const value = process.env[key];
  if (!value) {
    throw new Error(`${key} is required`);
  }
  return value;
}

const normalizePrivateKey = (privateKey) => {
  return privateKey.startsWith("0x") ? privateKey : `0x${privateKey}`;
}

const getOptionalEnv = (key) => {
  const value = process.env[key];
  return value && value.trim() ? value.trim() : undefined;
}

const getPolymarketFunderAddress = (accountAddress) => {
  return getOptionalEnv("POLYMARKET_DEPOSIT_WALLET_ADDRESS")
    || getOptionalEnv("POLYMARKET_FUNDER_ADDRESS")
    || accountAddress;
}

const getPolymarketSignatureType = (funderAddress, accountAddress) => {
  const configuredType = getOptionalEnv("POLYMARKET_SIGNATURE_TYPE");
  if (configuredType) {
    const signatureType = SignatureTypeV2[configuredType] ?? Number(configuredType);
    if (!Number.isInteger(signatureType) || !SignatureTypeV2[signatureType]) {
      throw new Error(`POLYMARKET_SIGNATURE_TYPE is invalid: ${configuredType}`);
    }
    return signatureType;
  }

  return funderAddress.toLowerCase() === accountAddress.toLowerCase()
    ? SignatureTypeV2.POLY_PROXY
    : SignatureTypeV2.POLY_1271;
}

/**
 * 创建 viem HTTP transport
 * NODE_HTTP_PROXY 存在时通过 axios 代理请求 Polygon RPC
 * @param {string} rpcUrl
 * @returns {import("viem").HttpTransport}
 */
const createViemHttpTransport = (rpcUrl) => {
  if (!NODE_HTTP_PROXY) {
    return rpcUrl ? http(rpcUrl) : http();
  }

  const fetchFn = async (url, init = {}) => {
    const headers = Object.fromEntries(new Headers(init.headers ?? {}).entries());
    const response = await axios({
      url,
      method: init.method || "POST",
      headers,
      data: init.body,
      transformResponse: [data => data],
      responseType: "text",
      validateStatus: () => true,
    });

    return new Response(response.data, {
      status: response.status,
      statusText: response.statusText,
      headers: response.headers,
    });
  };

  return http(rpcUrl, { fetchFn });
}

export const createClobClient = () => {
  const account = privateKeyToAccount(normalizePrivateKey(getRequiredEnv("POLYMARKET_PRIVATE_KEY")));
  const signer = createWalletClient({
    account,
    chain: polygon,
    transport: createViemHttpTransport(getOptionalEnv("POLYGON_RPC_URL")),
  });
  const funderAddress = getPolymarketFunderAddress(account.address);
  const userApiCreds = {
    key: getRequiredEnv("POLYMARKET_API_KEY"),
    secret: getRequiredEnv("POLYMARKET_API_SECRET"),
    passphrase: getRequiredEnv("POLYMARKET_API_PASSPHRASE"),
  };

  return new ClobClient({
    host: CLOB_HOST,
    chain: Chain.POLYGON,
    signer,
    creds: userApiCreds,
    signatureType: getPolymarketSignatureType(funderAddress, account.address),
    funderAddress,
    throwOnError: true,
  });
}

const createPolymarketContext = () => {
  const rpcUrl = getOptionalEnv("POLYGON_RPC_URL");
  const transport = createViemHttpTransport(rpcUrl);
  const account = privateKeyToAccount(normalizePrivateKey(getRequiredEnv("POLYMARKET_PRIVATE_KEY")));
  const signer = createWalletClient({ account, chain: polygon, transport });
  const publicClient = createPublicClient({ chain: polygon, transport });
  const creds = {
    key: getRequiredEnv("POLYMARKET_API_KEY"),
    secret: getRequiredEnv("POLYMARKET_API_SECRET"),
    passphrase: getRequiredEnv("POLYMARKET_API_PASSPHRASE"),
  };

  return { account, signer, publicClient, creds };
}

const normalizeWalletMode = (wallet = "both") => {
  const value = wallet.toLowerCase();
  if (!["deposit", "proxy", "both"].includes(value)) {
    throw new Error("wallet must be deposit, proxy, or both", { cause: 400 });
  }
  return value;
}

const createBalanceClobClient = ({ signer, creds, funderAddress, signatureType }) => {
  return new ClobClient({
    host: CLOB_HOST,
    chain: Chain.POLYGON,
    signer,
    creds,
    signatureType,
    funderAddress,
    throwOnError: true,
  });
}

const getChainPusdBalance = async ({ publicClient, address }) => {
  const balance = await publicClient.readContract({
    address: PUSD_ADDRESS,
    abi: erc20Abi,
    functionName: "balanceOf",
    args: [address],
  });
  return formatUnits(balance, PUSD_DECIMALS);
}

const getClobBalanceAllowance = async ({ signer, creds, funderAddress, signatureType }) => {
  const client = createBalanceClobClient({ signer, creds, funderAddress, signatureType });
  return client.getBalanceAllowance({ asset_type: AssetType.COLLATERAL });
}

const createBuilderConfig = () => {
  return new BuilderConfig({
    localBuilderCreds: {
      key: getRequiredEnv("POLYMARKET_BUILDER_API_KEY"),
      secret: getRequiredEnv("POLYMARKET_BUILDER_SECRET"),
      passphrase: getRequiredEnv("POLYMARKET_BUILDER_PASS_PHRASE"),
    },
  });
}

/**
 * 创建 Polymarket builder relayer 客户端
 * @param {Object} options
 * @param {Object} options.signer viem wallet client
 * @param {number} options.relayTxType relayer 交易类型
 * @returns {RelayClient}
 */
const createRelayer = ({ signer, relayTxType = RelayerTxType.PROXY } = {}) => {
  const relayerUrl = getOptionalEnv("POLYMARKET_RELAYER_URL") || "https://relayer-v2.polymarket.com";
  const relayer = new RelayClient(relayerUrl, CHAIN_ID, signer, createBuilderConfig(), relayTxType);
  if (proxyAgent) {
    relayer.httpClient.instance.defaults.proxy = false;
    relayer.httpClient.instance.defaults.httpAgent = proxyAgent;
    relayer.httpClient.instance.defaults.httpsAgent = proxyAgent;
  }
  return relayer;
}

/**
 * 获取 Polymarket proxy wallet 地址
 * @param {Object} options
 * @param {string} options.ownerAddress owner 钱包地址
 * @returns {string}
 */
const getProxyWalletAddress = ({ ownerAddress }) => {
  return getOptionalEnv("POLYMARKET_PROXY_WALLET_ADDRESS")
    || deriveProxyWallet(ownerAddress, PROXY_FACTORY_ADDRESS);
}

/**
 * 获取 Polymarket deposit wallet 地址
 * @param {Object} options
 * @param {Object} options.signer viem wallet client
 * @returns {Promise<string>}
 */
const getDepositWalletAddress = async ({ signer }) => {
  const configuredAddress = getOptionalEnv("POLYMARKET_DEPOSIT_WALLET_ADDRESS");
  if (configuredAddress) {
    return configuredAddress;
  }

  const relayer = createRelayer({ signer });
  return relayer.deriveDepositWalletAddress();
}

/**
 * 获取 pUSD 转账所需的钱包上下文
 * @returns {Promise<Object>} owner、signer、publicClient、relayer 和 proxy/deposit 钱包地址
 */
const getTransferWalletContext = async () => {
  const { account, signer, publicClient } = createPolymarketContext();
  const proxyRelayer = createRelayer({ signer, relayTxType: RelayerTxType.PROXY });
  const proxyWalletAddress = getProxyWalletAddress({ ownerAddress: account.address });
  const depositWalletAddress = await getDepositWalletAddress({ signer });

  return {
    account,
    signer,
    publicClient,
    proxyRelayer,
    proxyWalletAddress,
    depositWalletAddress,
  };
}

/**
 * 获取钱包原始 pUSD 余额
 * @param {Object} options
 * @param {Object} options.publicClient viem public client
 * @param {string} options.address 钱包地址
 * @returns {Promise<bigint>}
 */
const getRawPusdBalance = ({ publicClient, address }) => {
  return publicClient.readContract({
    address: PUSD_ADDRESS,
    abi: erc20Abi,
    functionName: "balanceOf",
    args: [address],
  });
}

/**
 * 校验并转换转账金额为 pUSD 最小单位
 * @param {string|number} amount 转账数量
 * @returns {bigint}
 */
const normalizeTransferAmount = (amount) => {
  if (!amount || !Number.isFinite(Number(amount)) || Number(amount) <= 0) {
    throw new Error("amount must be greater than 0", { cause: 400 });
  }
  return parseUnits(String(amount), PUSD_DECIMALS);
}

/**
 * 校验并标准化钱包转账方向
 * @param {Object} options
 * @param {string} options.from 来源钱包类型
 * @param {string} options.to 目标钱包类型
 * @returns {{from: "proxy"|"deposit", to: "proxy"|"deposit"}}
 */
const normalizeTransferDirection = ({ from, to } = {}) => {
  const normalizedFrom = String(from || "").toLowerCase();
  const normalizedTo = String(to || "").toLowerCase();
  if (
    !["proxy", "deposit"].includes(normalizedFrom)
    || !["proxy", "deposit"].includes(normalizedTo)
    || normalizedFrom === normalizedTo
  ) {
    throw new Error("Transfer direction must be proxy -> deposit or deposit -> proxy", { cause: 400 });
  }
  return { from: normalizedFrom, to: normalizedTo };
}

/**
 * 生成 pUSD ERC20 transfer 调用数据
 * @param {Object} options
 * @param {string} options.to 收款钱包地址
 * @param {bigint} options.amount pUSD 最小单位金额
 * @returns {string}
 */
const createPusdTransferData = ({ to, amount }) => {
  return encodeFunctionData({
    abi: erc20Abi,
    functionName: "transfer",
    args: [to, amount],
  });
}

/**
 * 统一格式化钱包转账返回结果
 * @param {Object} options
 * @returns {Object}
 */
const buildTransferResult = ({
  owner,
  from,
  to,
  sourceAddress,
  destinationAddress,
  amount,
  sourceBalance,
  transactionID,
  transactionHash,
  confirmed,
}) => {
  return {
    owner,
    pUSD: PUSD_ADDRESS,
    from,
    to,
    sourceAddress,
    destinationAddress,
    amount: String(amount),
    sourceBalance: formatUnits(sourceBalance, PUSD_DECIMALS),
    transactionID,
    transactionHash,
    confirmed,
  };
}

/**
 * 校验来源钱包 pUSD 余额是否足够
 * @param {Object} options
 * @param {string} options.wallet 钱包类型
 * @param {bigint} options.balance 当前余额
 * @param {bigint} options.amount 转账金额
 */
const ensureSufficientPusdBalance = ({ wallet, balance, amount }) => {
  if (balance < amount) {
    throw new Error(`Insufficient ${wallet} wallet pUSD balance: ${formatUnits(balance, PUSD_DECIMALS)}`, { cause: 400 });
  }
}

/**
 * 根据转账方向提交 relayer 交易
 * @param {Object} options
 * @param {"proxy"|"deposit"} options.from 来源钱包类型
 * @param {"proxy"|"deposit"} options.to 目标钱包类型
 * @param {Object} options.context 转账钱包上下文
 * @param {string} options.data pUSD transfer 调用数据
 * @param {string|number} options.amount 展示用转账数量
 * @returns {Promise<Object>}
 */
const executePusdTransfer = ({
  from,
  to,
  context,
  data,
  amount,
}) => {
  if (from === "proxy" && to === "deposit") {
    return context.proxyRelayer.execute(
      [{
        to: PUSD_ADDRESS,
        data,
        value: "0",
      }],
      `transfer ${amount} pUSD from proxy to deposit wallet`,
    );
  }

  const depositRelayer = createRelayer({ signer: context.signer });
  return depositRelayer.executeDepositWalletBatch(
    [{
      target: PUSD_ADDRESS,
      data,
      value: "0",
    }],
    context.depositWalletAddress,
    String(Math.floor(Date.now() / 1000) + 600),
  );
}

/**
 * 执行 pUSD 钱包间转账的公共流程
 * @param {Object} options
 * @param {string|number} options.amount 转账数量
 * @param {"proxy"|"deposit"} options.from 来源钱包类型
 * @param {"proxy"|"deposit"} options.to 目标钱包类型
 * @returns {Promise<Object>}
 */
const transferPusdBetweenWallets = async ({
  amount,
  from,
  to,
} = {}) => {
  const transferAmount = normalizeTransferAmount(amount);
  const context = await getTransferWalletContext();
  const sourceAddress = from === "proxy"
    ? context.proxyWalletAddress
    : context.depositWalletAddress;
  const destinationAddress = to === "proxy"
    ? context.proxyWalletAddress
    : context.depositWalletAddress;
  const sourceBalance = await getRawPusdBalance({
    publicClient: context.publicClient,
    address: sourceAddress,
  });
  ensureSufficientPusdBalance({
    wallet: from,
    balance: sourceBalance,
    amount: transferAmount,
  });

  const data = createPusdTransferData({
    to: destinationAddress,
    amount: transferAmount,
  });
  const response = await executePusdTransfer({
    from,
    to,
    context,
    data,
    amount,
  });
  const confirmed = await response.wait();

  return buildTransferResult({
    owner: context.account.address,
    from,
    to,
    sourceAddress,
    destinationAddress,
    amount,
    sourceBalance,
    transactionID: response.transactionID,
    transactionHash: response.transactionHash || response.hash,
    confirmed,
  });
}

/**
 * 获取足球联赛
 * @returns {Promise}
 */
export const getSoccerSports = async () => {
  return requestMarketData({ url: "/sports" })
  .then(sportsData => {
    return sportsData.filter(item => {
      const { tags } = item;
      const tagIds = tags.split(",").map(item => +item);
      return tagIds.includes(100350);
    });
  });
}

/**
 * 获取赛事数据
 * @param {Object} options
 * @param {number} options.limit
 * @param {number} options.tag_id
 * @param {boolean} options.active
 * @param {boolean} options.closed
 * @param {string} options.endDateMin
 * @param {string} options.endDateMax
 * @returns {Promise}
 */
export const getEvents = async ({
  limit = 500, tag_id = 100350, active = true,
  closed = false, endDateMin = "", endDateMax = "",
} = {}) => {
  return requestMarketData({
    url: "/events",
    params: {
      limit, tag_id,  active, closed,
      end_date_min: endDateMin,
      end_date_max: endDateMax,
    }
  }).then(events => events.filter(item => !!item.series));
}

/**
 * 获取订单簿数据
 */
export const getOrderBook = async (tokenId) => {
  return requestClobData({
    url: "/book",
    params: {
      token_id: tokenId,
    }
  });
}

/**
 * 批量获取订单簿数据
 * @param {Array} tokenIds
 * @returns {Promise}
 */
export const getMultipleOrderBooks = async (tokenIds) => {
  return requestClobData({
    url: "/books",
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    data: tokenIds.map(tokenId => ({ token_id: tokenId })),
  });
}

/**
 * 获取 USDC collateral 余额和授权信息
 */
export const getBalanceAllowance = async ({ wallet = "both" } = {}) => {
  const walletMode = normalizeWalletMode(wallet);
  const { account, signer, publicClient, creds } = createPolymarketContext();
  const wallets = [];

  if (walletMode === "proxy" || walletMode === "both") {
    wallets.push({
      type: "proxy",
      address: getProxyWalletAddress({ ownerAddress: account.address }),
      signatureType: SignatureTypeV2.POLY_PROXY,
    });
  }

  if (walletMode === "deposit" || walletMode === "both") {
    wallets.push({
      type: "deposit",
      address: await getDepositWalletAddress({ signer }),
      signatureType: SignatureTypeV2.POLY_1271,
    });
  }

  const results = [];
  for (const item of wallets) {
    const [chainPusdBalance, clobBalanceAllowance] = await Promise.all([
      getChainPusdBalance({ publicClient, address: item.address }),
      getClobBalanceAllowance({
        signer,
        creds,
        funderAddress: item.address,
        signatureType: item.signatureType,
      }),
    ]);
    results.push({
      type: item.type,
      owner: account.address,
      address: item.address,
      signatureType: SignatureTypeV2[item.signatureType],
      chainPusdBalance,
      clobBalanceAllowance,
    });
  }

  return results;
}

/**
 * 在 Proxy wallet 和 Deposit wallet 之间转 pUSD
 * @param {Object} options
 * @param {string|number} options.amount 转账数量
 * @param {"proxy"|"deposit"} options.from 来源钱包类型
 * @param {"proxy"|"deposit"} options.to 目标钱包类型
 * @returns {Promise<Object>}
 */
export const transferWallet = async ({ amount, from, to } = {}) => {
  const direction = normalizeTransferDirection({ from, to });
  return transferPusdBetweenWallets({
    amount,
    from: direction.from,
    to: direction.to,
  });
}

/**
 * 创建 Polymarket 限价挂单
 */
export const createLimitOrder = async ({
  tokenID,
  price,
  size,
  side = Side.BUY,
  tickSize = "0.01",
  negRisk = false,
  orderType = OrderType.GTC,
  postOnly = true,
  expiration,
  deferExec = false,
} = {}) => {
  if (!tokenID) {
    throw new Error("tokenID is required", { cause: 400 });
  }
  if (!Number.isFinite(Number(price))) {
    throw new Error("price is required", { cause: 400 });
  }
  if (!Number.isFinite(Number(size))) {
    throw new Error("size is required", { cause: 400 });
  }
  if (orderType !== OrderType.GTC && orderType !== OrderType.GTD) {
    throw new Error(`orderType must be ${OrderType.GTC} or ${OrderType.GTD}`, { cause: 400 });
  }

  const client = createClobClient();
  const orderData = {
    tokenID,
    price: Number(price),
    size: Number(size),
    side,
    ...(expiration ? { expiration: Number(expiration) } : {}),
  };
  const orderOptions = { tickSize, negRisk };

  Logs.outDev('polymarket create limit order data', orderData, orderOptions, orderType, postOnly, deferExec);

  return client.createAndPostOrder(orderData, orderOptions, orderType, postOnly, deferExec);
}

/**
 * 请求平台数据
 * @param {*} options
 * @returns {Promise}
 */
export const platformRequest = async (options) => {
  const { url } = options;
  if (!url) {
    throw new Error("url is required");
  }
  const internalToken = process.env.PPAI_INTERNAL_API_TOKEN;
  const mergedOptions = {
    ...axiosDefaultOptions,
    ...options,
    baseURL: "http://127.0.0.1:9020",
    headers: {
      ...axiosDefaultOptions.headers,
      ...options.headers,
      ...(internalToken ? { Authorization: `Bearer ${internalToken}` } : {}),
    },
    httpAgent: null,
    httpsAgent: null,
    proxy: false,
  };
  return axios(mergedOptions).then(res => res.data);
}

/**
 * 请求平台 POST 数据
 * @param {string} url
 * @param {Object} data
 * @returns {Promise}
 */
export const platformPost = async (url, data) => {
  return platformRequest({
    url,
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    data,
  });
}

/**
 * 请求平台 GET 数据
 * @param {string} url
 * @param {Object} params
 * @returns {Promise}
 */
export const platformGet = async (url, params) => {
  return platformRequest({ url, method: 'GET', params });
}

/**
 * 市场 WebSocket 客户端
 */
export class MarketWsClient extends WebSocketClient {
  #assetIds = [];
  constructor() {
    let agent;
    const proxy = process.env.NODE_HTTP_PROXY;
    if (proxy) {
      agent = new HttpsProxyAgent(proxy);
    }
    super("wss://ws-subscriptions-clob.polymarket.com/ws/market", { agent });
  }

  connect() {
    super.connect();
    this.on('open', () => {
      if (this.#assetIds.length > 0) {
        this.subscribeToTokensIds(this.#assetIds);
      }
    });
  }

  subscribeToTokensIds(assetIds) {
    this.#assetIds = [...new Set([...this.#assetIds, ...assetIds])];
    this.send({
      operation: "subscribe",
      assets_ids: assetIds,
    });
  }

  unsubscribeToTokensIds(assetIds) {
    const assetIdsSet = new Set(assetIds);
    this.#assetIds = this.#assetIds.filter(id => !assetIdsSet.has(id));
    this.send({
      operation: "unsubscribe",
      assets_ids: assetIds,
    });
  }
}