/**
 * Enhanced Address page with balance flow visualization and UTXO filtering.
 */

import { useState, useMemo } from 'react';
import { useParams, Link } from 'react-router-dom';
import {
  Wallet,
  Coins,
  Box,
  ArrowDownLeft,
  ArrowUpRight,
  Filter,
  TrendingUp,
  Gift,
} from 'lucide-react';
import { useAddress, useAddressUtxos } from '../hooks/useApi';
import CopyButton from '../components/CopyButton';
import { formatSynor, truncateHash, cn } from '../lib/utils';

type UtxoFilter = 'all' | 'coinbase' | 'regular';

export default function Address() {
  const { address } = useParams<{ address: string }>();
  const { data: info, isLoading: infoLoading, error: infoError } = useAddress(address || '');
  const { data: utxos, isLoading: utxosLoading } = useAddressUtxos(address || '');
  const [utxoFilter, setUtxoFilter] = useState<UtxoFilter>('all');

  // Filter UTXOs based on selection
  const filteredUtxos = useMemo(() => {
    if (!utxos) return [];
    switch (utxoFilter) {
      case 'coinbase':
        return utxos.filter((u) => u.utxoEntry.isCoinbase);
      case 'regular':
        return utxos.filter((u) => !u.utxoEntry.isCoinbase);
      default:
        return utxos;
    }
  }, [utxos, utxoFilter]);

  // Calculate coinbase count for filter badge
  const coinbaseCount = useMemo(() => {
    if (!utxos) return 0;
    return utxos.filter((u) => u.utxoEntry.isCoinbase).length;
  }, [utxos]);

  if (!address) {
    return <div className="card p-6 text-red-400">Address is required</div>;
  }

  if (infoLoading) {
    return <AddressSkeleton />;
  }

  if (infoError) {
    return (
      <div className="card p-6 text-red-400">
        Error loading address: {infoError.message}
      </div>
    );
  }

  if (!info) {
    return <div className="card p-6 text-gray-400">Address not found</div>;
  }

  // Calculate percentages for balance flow
  const totalFlow = info.totalReceived + info.totalSent;
  const receivedPercent = totalFlow > 0 ? (info.totalReceived / totalFlow) * 100 : 50;

  return (
    <div className="space-y-6">
      {/* Modern Header */}
      <div className="relative">
        {/* Background glow */}
        <div className="absolute -top-10 left-0 w-[300px] h-[150px] bg-synor-500/10 rounded-full blur-[80px] pointer-events-none" />

        <div className="relative flex flex-col md:flex-row md:items-center gap-4">
          <div className="flex items-center gap-4 flex-1 min-w-0">
            <div className="p-3 rounded-xl bg-gradient-to-br from-synor-500/20 to-violet-500/20 border border-synor-500/30">
              <Wallet size={28} className="text-synor-400" />
            </div>
            <div className="min-w-0">
              <h1 className="text-2xl md:text-3xl font-bold bg-gradient-to-r from-white to-gray-300 bg-clip-text text-transparent">
                Address
              </h1>
              <div className="flex items-center gap-2 mt-1">
                <span className="hash text-sm text-gray-400 truncate max-w-[300px] md:max-w-none">
                  {info.address}
                </span>
                <CopyButton text={info.address} />
              </div>
            </div>
          </div>
        </div>
      </div>

      {/* Balance Overview Card */}
      <div className="card overflow-hidden">
        <div className="p-6">
          <div className="grid sm:grid-cols-2 lg:grid-cols-4 gap-6">
            {/* Current Balance */}
            <div className="sm:col-span-2 lg:col-span-1">
              <div className="flex items-center gap-2 mb-2">
                <Coins size={16} className="text-synor-400" />
                <span className="text-sm text-gray-400">Balance</span>
              </div>
              <p className="text-2xl lg:text-3xl font-bold text-synor-400 font-mono">
                {info.balanceHuman}
              </p>
            </div>

            {/* Total Received */}
            <div>
              <div className="flex items-center gap-2 mb-2">
                <ArrowDownLeft size={16} className="text-green-400" />
                <span className="text-sm text-gray-400">Total Received</span>
              </div>
              <p className="text-xl font-bold text-green-400 font-mono">
                {formatSynor(info.totalReceived)}
              </p>
            </div>

            {/* Total Sent */}
            <div>
              <div className="flex items-center gap-2 mb-2">
                <ArrowUpRight size={16} className="text-red-400" />
                <span className="text-sm text-gray-400">Total Sent</span>
              </div>
              <p className="text-xl font-bold text-red-400 font-mono">
                {formatSynor(info.totalSent)}
              </p>
            </div>

            {/* Transaction Count */}
            <div>
              <div className="flex items-center gap-2 mb-2">
                <TrendingUp size={16} className="text-blue-400" />
                <span className="text-sm text-gray-400">Transactions</span>
              </div>
              <p className="text-xl font-bold text-blue-400">
                {info.transactionCount.toLocaleString()}
              </p>
            </div>
          </div>
        </div>

        {/* Balance Flow Visualization */}
        <div className="border-t border-gray-800 px-6 py-4 bg-gray-900/30">
          <div className="flex items-center justify-between text-sm mb-2">
            <span className="text-gray-400">Balance Flow</span>
            <span className="text-gray-500">
              {info.utxoCount} UTXO{info.utxoCount !== 1 ? 's' : ''}
            </span>
          </div>
          <div className="h-3 bg-gray-800 rounded-full overflow-hidden flex">
            <div
              className="h-full bg-gradient-to-r from-green-500 to-green-400 transition-all duration-500"
              style={{ width: `${receivedPercent}%` }}
              title={`Received: ${formatSynor(info.totalReceived)}`}
            />
            <div
              className="h-full bg-gradient-to-r from-red-400 to-red-500 transition-all duration-500"
              style={{ width: `${100 - receivedPercent}%` }}
              title={`Sent: ${formatSynor(info.totalSent)}`}
            />
          </div>
          <div className="flex justify-between text-xs text-gray-500 mt-1">
            <span className="text-green-400">
              In: {((info.totalReceived / totalFlow) * 100).toFixed(1)}%
            </span>
            <span className="text-red-400">
              Out: {((info.totalSent / totalFlow) * 100).toFixed(1)}%
            </span>
          </div>
        </div>
      </div>

      {/* UTXOs with Filtering */}
      <div className="card">
        <div className="card-header flex flex-col sm:flex-row sm:items-center justify-between gap-3">
          <div className="flex items-center gap-2">
            <Coins size={18} className="text-synor-400" />
            <h2 className="font-semibold">
              UTXOs {utxos && `(${filteredUtxos.length}${utxoFilter !== 'all' ? ` of ${utxos.length}` : ''})`}
            </h2>
          </div>

          {/* Filter Buttons */}
          <div className="flex items-center gap-1 p-1 bg-gray-800/50 rounded-lg" role="group" aria-label="Filter UTXOs">
            <FilterButton
              active={utxoFilter === 'all'}
              onClick={() => setUtxoFilter('all')}
              label="All"
              icon={<Filter size={14} />}
            />
            <FilterButton
              active={utxoFilter === 'coinbase'}
              onClick={() => setUtxoFilter('coinbase')}
              label="Coinbase"
              icon={<Gift size={14} />}
              badge={coinbaseCount > 0 ? coinbaseCount : undefined}
            />
            <FilterButton
              active={utxoFilter === 'regular'}
              onClick={() => setUtxoFilter('regular')}
              label="Regular"
              icon={<Coins size={14} />}
            />
          </div>
        </div>

        {utxosLoading ? (
          <div className="p-4 text-center text-gray-500">Loading UTXOs...</div>
        ) : filteredUtxos.length > 0 ? (
          <div className="overflow-x-auto">
            <table className="w-full">
              <thead>
                <tr className="text-left text-sm text-gray-400 border-b border-gray-800">
                  <th className="px-4 py-3 font-medium">Transaction</th>
                  <th className="px-4 py-3 font-medium">Index</th>
                  <th className="px-4 py-3 font-medium text-right">Amount</th>
                  <th className="px-4 py-3 font-medium hidden sm:table-cell">Type</th>
                </tr>
              </thead>
              <tbody>
                {filteredUtxos.map((utxo, i) => (
                  <tr key={i} className="table-row hover:bg-gray-800/30 transition-colors">
                    <td className="px-4 py-3">
                      <Link
                        to={`/tx/${utxo.outpoint.transactionId}`}
                        className="hash text-sm text-synor-400 hover:text-synor-300"
                      >
                        {truncateHash(utxo.outpoint.transactionId)}
                      </Link>
                    </td>
                    <td className="px-4 py-3 text-sm text-gray-400">
                      {utxo.outpoint.index}
                    </td>
                    <td className="px-4 py-3 text-right">
                      <span className="font-mono text-sm text-green-400">
                        {formatSynor(utxo.utxoEntry.amount, 4)}
                      </span>
                    </td>
                    <td className="px-4 py-3 hidden sm:table-cell">
                      <div className="flex items-center gap-2">
                        {utxo.utxoEntry.isCoinbase ? (
                          <span className="inline-flex items-center gap-1 px-2 py-0.5 text-xs font-medium bg-amber-500/20 text-amber-400 rounded-full border border-amber-500/30">
                            <Gift size={10} />
                            Coinbase
                          </span>
                        ) : (
                          <span className="text-xs text-gray-500">Regular</span>
                        )}
                        <span className="text-xs text-gray-600">
                          v{utxo.utxoEntry.scriptPublicKey.version}
                        </span>
                      </div>
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        ) : (
          <div className="p-8 text-center text-gray-500">
            <Box size={48} className="mx-auto mb-4 opacity-50" />
            <p>
              {utxoFilter === 'all'
                ? 'No UTXOs found for this address'
                : `No ${utxoFilter} UTXOs found`}
            </p>
            {utxoFilter !== 'all' && utxos && utxos.length > 0 && (
              <button
                onClick={() => setUtxoFilter('all')}
                className="mt-2 text-sm text-synor-400 hover:text-synor-300"
              >
                Show all UTXOs
              </button>
            )}
          </div>
        )}
      </div>
    </div>
  );
}

function FilterButton({
  active,
  onClick,
  label,
  icon,
  badge,
}: {
  active: boolean;
  onClick: () => void;
  label: string;
  icon: React.ReactNode;
  badge?: number;
}) {
  return (
    <button
      onClick={onClick}
      className={cn(
        'flex items-center gap-1.5 px-3 py-1.5 rounded-md text-sm font-medium transition-colors',
        active
          ? 'bg-synor-600 text-white'
          : 'text-gray-400 hover:text-white hover:bg-gray-700/50'
      )}
      aria-pressed={active}
    >
      {icon}
      <span className="hidden sm:inline">{label}</span>
      {badge !== undefined && (
        <span className={cn(
          'px-1.5 py-0.5 text-xs rounded-full',
          active ? 'bg-white/20' : 'bg-gray-700'
        )}>
          {badge}
        </span>
      )}
    </button>
  );
}

function AddressSkeleton() {
  return (
    <div className="space-y-6 animate-pulse">
      <div className="flex items-center gap-4">
        <div className="w-14 h-14 rounded-xl bg-gray-800" />
        <div>
          <div className="h-8 w-32 bg-gray-800 rounded mb-2" />
          <div className="h-4 w-64 bg-gray-800 rounded" />
        </div>
      </div>
      <div className="card p-6">
        <div className="grid sm:grid-cols-2 lg:grid-cols-4 gap-6">
          {Array.from({ length: 4 }).map((_, i) => (
            <div key={i}>
              <div className="h-4 w-20 bg-gray-800 rounded mb-2" />
              <div className="h-8 w-32 bg-gray-800 rounded" />
            </div>
          ))}
        </div>
        <div className="mt-6 pt-4 border-t border-gray-800">
          <div className="h-3 bg-gray-800 rounded-full" />
        </div>
      </div>
      <div className="card">
        <div className="card-header">
          <div className="h-5 w-32 bg-gray-800 rounded" />
        </div>
        <div className="p-4">
          {Array.from({ length: 3 }).map((_, i) => (
            <div key={i} className="flex items-center gap-4 py-3">
              <div className="h-4 w-32 bg-gray-800 rounded" />
              <div className="h-4 w-12 bg-gray-800 rounded" />
              <div className="flex-1" />
              <div className="h-4 w-24 bg-gray-800 rounded" />
            </div>
          ))}
        </div>
      </div>
    </div>
  );
}