'use client';

import { useState, useEffect, useCallback } from 'react';
import PortalLayout from '@/app/layout-portal';
import AuthGuard from '@/components/AuthGuard';
import { paymentService, PaymentProvider, type TokenInfo, type MAOSDiscountTier } from '@/lib/payment';
import {
  connectWallet, switchToChain270, getInjectedProvider, addWalletListener, disconnectWallet,
  type WalletProvider,
} from '@/lib/wallet';
import { SkeletonCard } from '@/components/Skeleton';
import { useNotify } from '@/lib/notifications';
import Overview from './components/Overview';
import PricingView from './components/PricingView';
import TokensView from './components/TokensView';
import TiersView from './components/TiersView';
import ErrorBoundary from '@/components/ErrorBoundary';
import type { ViewMode, TxStatus } from './helpers';
import { WalletConnect, WrongChainWarning, WalletInfo, NavTabs, TxStatusToast } from './components';

export default function AdminPaymentPage() {
  const [address, setAddress] = useState<string | null>(null);
  const [provider, setProvider] = useState<WalletProvider | null>(null);
  const [connecting, setConnecting] = useState(false);
  const [wrongChain, setWrongChain] = useState(false);
  const [walletType, setWalletType] = useState<string | null>(null);
  const [view, setView] = useState<ViewMode>('overview');
  const [txStatus, setTxStatus] = useState<TxStatus>(null);

  // Contract state
  const [owner, setOwner] = useState<string | null>(null);
  const [deployed, setDeployed] = useState(false);
  const [basePrice, setBasePrice] = useState<bigint>(BigInt(0));
  const [freeTier, setFreeTier] = useState<bigint>(BigInt(0));
  const [tokens, setTokens] = useState<TokenInfo[]>([]);
  const [tiers, setTiers] = useState<MAOSDiscountTier[]>([]);
  const [totalUploads, setTotalUploads] = useState<bigint>(BigInt(0));
  const [revenues, setRevenues] = useState<Record<string, bigint>>({});
  const [loading, setLoading] = useState(true);
  const [contractBalance, setContractBalance] = useState<Record<string, string>>({});

  const isOwner = !!(address && owner && address.toLowerCase() === owner.toLowerCase());
  const { notify } = useNotify();

  // ── Load all contract state ──
  const refresh = useCallback(async () => {
    setLoading(true);
    setTxStatus(null);
    try {
      paymentService.isDeployed().then(setDeployed).catch((err) => { console.error('[AdminPayment] Deploy check failed:', err); setDeployed(false); });
      const [own, price, free, t, tiersData, uploads] = await Promise.all([
        paymentService.getOwner(),
        paymentService.getBasePricePerMB(),
        paymentService.getFreeTierBytes(),
        paymentService.getSupportedTokens(),
        paymentService.getMAOSDiscountTiers(),
        paymentService.getTotalUploads(),
      ]);
      setOwner(own);
      setBasePrice(price);
      setFreeTier(free);
      setTiers(tiersData);

      const seen = new Set<string>();
      const uniqueTokens = t.filter(tk => {
        if (seen.has(tk.symbol)) return false;
        seen.add(tk.symbol);
        return true;
      });
      setTokens(uniqueTokens);

      const symbols = uniqueTokens.map(tk => tk.symbol);
      const revEntries = await Promise.all(symbols.map(s => paymentService.getTotalRevenue(s)));
      const revMap: Record<string, bigint> = {};
      symbols.forEach((s, i) => { revMap[s] = revEntries[i]; });
      setRevenues(revMap);

      const balMap: Record<string, string> = {};
      for (const tk of t) {
        try {
          const client = (paymentService as any)['getPublicClient']();
          if (tk.symbol === 'ETH') {
            const bal = await client.getBalance({ address: (paymentService as any)['contractAddress'] });
            balMap['ETH'] = bal.toString();
          } else if (tk.address && tk.address !== '0x0000000000000000000000000000000000000000') {
            const ERC20_BAL_ABI = [{ type: 'function' as const, name: 'balanceOf', inputs: [{ type: 'address' as const }], outputs: [{ type: 'uint256' as const }], stateMutability: 'view' as const }];
            const bal = await client.readContract({
              address: tk.address as `0x${string}`,
              abi: ERC20_BAL_ABI,
              functionName: 'balanceOf',
              args: [(paymentService as any)['contractAddress']],
            });
            balMap[tk.symbol] = (bal as bigint).toString();
          }
        } catch (err) { console.error('[AdminPayment] Failed to fetch balance for token:', err); }
      }
      setContractBalance(balMap);
      setTotalUploads(uploads);
      setTokens(t);
    } catch (e) {
      console.warn('Failed to load contract state:', e);
    } finally {
      setLoading(false);
    }
  }, []);

  useEffect(() => { refresh(); }, [refresh]);

  // ── Listen for external wallet disconnect ──
  useEffect(() => {
    if (!provider) return;
    const cb = (accounts: string[]) => {
      if (accounts.length === 0) {
        setAddress(null);
        setProvider(null);
        setConnecting(false);
        setWrongChain(false);
        setWalletType(null);
        notify({ type: 'info', title: 'Wallet disconnected' });
      }
    };
    addWalletListener('accountsChanged', cb);
  }, [provider, notify]);

  // ── Connect wallet ──
  async function handleConnect() {
    setConnecting(true);
    setTxStatus(null);
    try {
      const result = await connectWallet();
      const prov = getInjectedProvider();
      setAddress(result.address);
      setProvider(prov);
      if (result.chainId !== 270) {
        setWrongChain(true);
        const switched = await switchToChain270(prov || undefined);
        if (switched) setWrongChain(false);
      }
      if (window.ethereum?.isRabby) setWalletType('Rabby');
      else if (window.ethereum?.isMetaMask) setWalletType('MetaMask');
      else setWalletType('Wallet');
    } catch (e: unknown) {
      setTxStatus({ ok: false, msg: e instanceof Error ? e.message : 'Connect failed' });
    } finally {
      setConnecting(false);
    }
  }

  function handleDisconnect() {
    disconnectWallet();
    setAddress(null); setProvider(null); setConnecting(false);
    setWrongChain(false); setWalletType(null);
    notify({ type: 'success', title: 'Wallet disconnected' });
  }

  async function doTx(label: string, fn: () => Promise<string>) {
    if (!provider) return;
    setTxStatus(null);
    try {
      const hash = await fn();
      setTxStatus({ ok: true, msg: `${label} success: ${hash.slice(0, 10)}...` });
      await refresh();
    } catch (e: unknown) {
      setTxStatus({ ok: false, msg: `${label} failed: ${e instanceof Error ? e.message : String(e)}` });
    }
  }

  // ── Form state ──
  const [priceInput, setPriceInput] = useState('');
  const [freeInput, setFreeInput] = useState('');
  const [tierBalance, setTierBalance] = useState('');
  const [tierBps, setTierBps] = useState('');
  const [tierRemoveIdx, setTierRemoveIdx] = useState<number>(-1);
  const [tokenSymbol, setTokenSymbol] = useState('');
  const [tokenAddr, setTokenAddr] = useState('');
  const [tokenDec, setTokenDec] = useState('18');
  const [tokenWei, setTokenWei] = useState('');
  const [tokenEnabled, setTokenEnabled] = useState(true);

  return (
    <AuthGuard requireAdmin redirectTo="/dashboard">
    <PortalLayout>
      <ErrorBoundary label="Betaalbeheer">
      <div className="flex items-center justify-between mb-6">
        <div>
          <h1 className="text-2xl font-bold text-white">Payment Admin</h1>
          <p className="text-sm text-surface-400 mt-1">Manage IPFS Portal payment contract</p>
        </div>
        {address && (
          <WalletInfo
            address={address}
            isOwner={isOwner}
            loading={loading}
            onRefresh={refresh}
            onDisconnect={handleDisconnect}
          />
        )}
      </div>

      {!address && <WalletConnect connecting={connecting} onConnect={handleConnect} />}
      {wrongChain && <WrongChainWarning />}

      {address && (
        <PaymentProvider>
          <NavTabs view={view} onChange={setView} />

          {loading ? (
            <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4 animate-fade-in">
              {Array.from({ length: 6 }).map((_, i) => <SkeletonCard key={i} />)}
            </div>
          ) : (
            <>
              {view === 'overview' && (
                <Overview
                  totalUploads={totalUploads}
                  tokens={tokens}
                  revenues={revenues}
                  contractBalance={contractBalance}
                  contractAddress={(paymentService as any)['contractAddress']}
                  owner={owner}
                  isOwner={isOwner}
                  address={address}
                  deployed={deployed}
                  onNavigate={(v: string) => setView(v as ViewMode)}
                />
              )}
              {view === 'pricing' && (
                <PricingView
                  basePrice={basePrice}
                  freeTier={freeTier}
                  isOwner={isOwner}
                  tokens={tokens}
                  contractBalance={contractBalance}
                  priceInput={priceInput}
                  setPriceInput={setPriceInput}
                  freeInput={freeInput}
                  setFreeInput={setFreeInput}
                  doTx={doTx}
                  provider={provider}
                  address={address}
                />
              )}
              {view === 'tokens' && (
                <TokensView
                  tokens={tokens}
                  isOwner={isOwner}
                  contractBalance={contractBalance}
                  tokenSymbol={tokenSymbol}
                  setTokenSymbol={setTokenSymbol}
                  tokenAddr={tokenAddr}
                  setTokenAddr={setTokenAddr}
                  tokenDec={tokenDec}
                  setTokenDec={setTokenDec}
                  tokenWei={tokenWei}
                  setTokenWei={setTokenWei}
                  tokenEnabled={tokenEnabled}
                  setTokenEnabled={setTokenEnabled}
                  doTx={doTx}
                  provider={provider}
                  address={address}
                />
              )}
              {view === 'tiers' && (
                <TiersView
                  tiers={tiers}
                  isOwner={isOwner}
                  tierBalance={tierBalance}
                  setTierBalance={setTierBalance}
                  tierBps={tierBps}
                  setTierBps={setTierBps}
                  doTx={doTx}
                  provider={provider}
                />
              )}
            </>
          )}

          <TxStatusToast status={txStatus} />
        </PaymentProvider>
      )}
      </ErrorBoundary>
    </PortalLayout>
    </AuthGuard>
  );
}