import { createConfig, http } from 'wagmi';
import { mainnet, sepolia, base, arbitrum } from 'wagmi/chains';

// Create wagmiConfig
const metadata = {
  name: 'MortgageFi',
  description: 'Decentralized Mortgage Lending Platform',
  url: 'https://mortgagefi.app',
  icons: ['https://mortgagefi.app/logo.png']
};

// Prefer custom RPCs to avoid public-provider rate limits (429)
// Support runtime overrides via localStorage:
//  - rpc:base
//  - rpc:arbitrum
//  - rpc:mainnet
function runtimeRpc(key: string): string | null {
  try {
    if (typeof window !== 'undefined' && window.localStorage) {
      const v = window.localStorage.getItem(key);
      return (v && v.trim()) ? v.trim() : null;
    }
  } catch {}
  return null;
}

const enableMainnet = process.env.NEXT_PUBLIC_ENABLE_MAINNET === 'true';

const baseRpc = runtimeRpc('rpc:base') || process.env.NEXT_PUBLIC_RPC_BASE || 'https://base.llamarpc.com';
const arbitrumRpc = runtimeRpc('rpc:arbitrum') || process.env.NEXT_PUBLIC_RPC_ARBITRUM || '';
const mainnetRpc = runtimeRpc('rpc:mainnet') || '';

export const config = createConfig({
  chains: [base, arbitrum, ...(enableMainnet ? [mainnet] : []), sepolia],
  transports: {
    [base.id]: baseRpc ? http(baseRpc, { batch: true, retryCount: 2, retryDelay: 250 }) : http(undefined, { batch: true, retryCount: 2, retryDelay: 250 }),
    [arbitrum.id]: arbitrumRpc ? http(arbitrumRpc, { batch: true, retryCount: 2, retryDelay: 250 }) : http(undefined, { batch: true, retryCount: 2, retryDelay: 250 }),
    [mainnet.id]: mainnetRpc ? http(mainnetRpc, { batch: true, retryCount: 2, retryDelay: 250 }) : http(),
    [sepolia.id]: http(),
  },
  ssr: true,
});