"use client";

import { useReadContracts } from 'wagmi';
import { useAccount } from 'wagmi';
import { formatUnits } from 'viem';
import { useQuery } from '@tanstack/react-query';
import { useApp } from "@/contexts/AppContext";
import { getContractAddress, abis } from '@/lib/contracts';

function formatUSD(v: number): string {
  if (v >= 1_000_000) return `$${(v / 1_000_000).toFixed(2)}M`;
  if (v >= 1_000) return `$${(v / 1_000).toFixed(2)}K`;
  return `$${v.toFixed(2)}`;
}

export default function ALPStatsCards() {
  const { t } = useApp();
  const { chainId } = useAccount();

  const poolManagerAddress = chainId ? getContractAddress('YTPoolManager', chainId) : undefined;
  const lpTokenAddress     = chainId ? getContractAddress('YTLPToken', chainId) : undefined;

  const { data: tvlData, isLoading } = useReadContracts({
    contracts: [
      {
        address: poolManagerAddress,
        abi: abis.YTPoolManager as any,
        functionName: 'getAumInUsdy',
        args: [true],
        chainId: chainId,
      },
      {
        address: lpTokenAddress,
        abi: abis.YTLPToken as any,
        functionName: 'totalSupply',
        args: [],
        chainId: chainId,
      },
    ],
    query: { refetchInterval: 30000, enabled: !!poolManagerAddress && !!lpTokenAddress && !!chainId },
  });

  const aumRaw     = tvlData?.[0]?.result as bigint | undefined;
  const supplyRaw  = tvlData?.[1]?.result as bigint | undefined;
  const tvlValue = aumRaw ? formatUSD(parseFloat(formatUnits(aumRaw, 18))) : (isLoading ? '...' : '--');
  const alpPrice = aumRaw && supplyRaw && supplyRaw > 0n
    ? `$${(parseFloat(formatUnits(aumRaw, 18)) / parseFloat(formatUnits(supplyRaw, 18))).toFixed(4)}`
    : (isLoading ? '...' : '--');

  // Fetch APR from backend (requires historical snapshots)
  const { data: aprData } = useQuery({
    queryKey: ['alp-stats'],
    queryFn: async () => {
      const res = await fetch('/api/alp/stats');
      const json = await res.json();
      return json.data as { poolAPR: number; rewardAPR: number };
    },
    refetchInterval: 5 * 60 * 1000, // refresh every 5 min
  });

  const poolAPR = aprData?.poolAPR != null
    ? `${aprData.poolAPR.toFixed(4)}%`
    : '--';

  const stats = [
    {
      label: t("stats.totalValueLocked"),
      value: tvlValue,
      isGreen: false,
    },
    {
      label: t("alp.price"),
      value: alpPrice,
      isGreen: false,
    },
    {
      label: t("alp.poolAPR"),
      value: poolAPR,
      isGreen: aprData?.poolAPR != null && aprData.poolAPR > 0,
    },
    {
      label: t("alp.rewardAPR"),
      value: "--",
      isGreen: true,
    },
  ];

  return (
    <div className="grid grid-cols-2 md:grid-cols-4 gap-3 md:gap-4">
      {stats.map((stat, index) => (
        <div
          key={index}
          className="bg-bg-subtle dark:bg-gray-800 rounded-2xl border border-border-gray dark:border-gray-700 px-4 md:px-6 py-4 flex flex-col gap-2"
        >
          <div className="text-caption-tiny font-bold text-text-tertiary dark:text-gray-400">
            {stat.label}
          </div>
          <div className={`text-xl md:text-[32px] font-bold leading-[130%] tracking-[-0.01em] ${stat.isGreen ? 'text-[#10b981]' : 'text-text-primary dark:text-white'}`}>
            {stat.value}
          </div>
        </div>
      ))}
    </div>
  );
}