import type { Asset, Chain } from './types';
import { DEFAULT_CONFIRMATIONS } from './statemachine';

export interface ChainNetworkParams {
  chain: Chain;
  asset: Asset;
  tokenContract: string;
  tokenDecimals: number;
  /** JSON-RPC endpoint (Base). */
  rpcUrl?: string;
  /** TronGrid base URL (Tron). */
  apiUrl?: string;
  confirmations: number;
  explorerTx: (txid: string) => string;
  explorerAddress: (address: string) => string;
}

export interface ChainParamsInput {
  testnet: boolean;
  env?: Record<string, string | undefined>;
}

/**
 * Network parameters for both chains, with TESTNET switching everything to
 * Base Sepolia / Tron Nile, and every value overridable from .env.
 */
export function chainNetworkParams({ testnet, env = {} }: ChainParamsInput): Record<Chain, ChainNetworkParams> {
  // Blank env values (e.g. VAR= in .env / compose defaults) mean "unset".
  const set = (v: string | undefined) => (v && v.trim() !== '' ? v.trim() : undefined);

  const base: ChainNetworkParams = {
    chain: 'base',
    asset: 'USDC',
    tokenDecimals: 6,
    rpcUrl: set(env.BASE_RPC_URL) ?? (testnet ? 'https://sepolia.base.org' : 'https://mainnet.base.org'),
    tokenContract:
      set(env.BASE_USDC_CONTRACT) ??
      (testnet
        ? '0x036CbD53842c5426634e7929541eC2318f3dCF7e' // USDC on Base Sepolia
        : '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913'), // USDC on Base mainnet
    confirmations: intFromEnv(env.BASE_CONFIRMATIONS) ?? DEFAULT_CONFIRMATIONS.base,
    explorerTx: (txid) => `https://${testnet ? 'sepolia.' : ''}basescan.org/tx/${txid}`,
    explorerAddress: (address) => `https://${testnet ? 'sepolia.' : ''}basescan.org/address/${address}`,
  };

  const tron: ChainNetworkParams = {
    chain: 'tron',
    asset: 'USDT',
    tokenDecimals: 6,
    apiUrl: set(env.TRONGRID_URL) ?? (testnet ? 'https://nile.trongrid.io' : 'https://api.trongrid.io'),
    tokenContract:
      set(env.TRON_USDT_CONTRACT) ??
      (testnet
        ? 'TXYZopYRdj2D9XRtbG411XZZ3kM5VkAeBf' // USDT on Nile testnet — verify/override in .env at deploy time
        : 'TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t'), // USDT on Tron mainnet
    confirmations: intFromEnv(env.TRON_CONFIRMATIONS) ?? DEFAULT_CONFIRMATIONS.tron,
    explorerTx: (txid) => `https://${testnet ? 'nile.' : ''}tronscan.org/#/transaction/${txid}`,
    explorerAddress: (address) => `https://${testnet ? 'nile.' : ''}tronscan.org/#/address/${address}`,
  };

  return { base, tron };
}

function intFromEnv(value: string | undefined): number | undefined {
  if (!value) return undefined;
  const n = Number.parseInt(value, 10);
  return Number.isFinite(n) && n > 0 ? n : undefined;
}