"use client";

import { useState, useEffect, useMemo } from "react";
import Image from "next/image";
import { toast } from "sonner";
import { useApp } from "@/contexts/AppContext";
import { useQuery } from "@tanstack/react-query";
import { useReadContract } from "wagmi";
import { fetchContracts } from "@/lib/api/contracts";
import { abis } from "@/lib/contracts";
import { ProductDetail } from "@/lib/api/fundmarket";

interface ProductHeaderProps {
  product: ProductDetail;
}

export default function ProductHeader({ product }: ProductHeaderProps) {
  const { t } = useApp();
  const [copied, setCopied] = useState(false);

  // 从合约读取状态
  const { data: contractConfigs = [] } = useQuery({
    queryKey: ['contract-registry'],
    queryFn: fetchContracts,
    staleTime: 5 * 60 * 1000,
  });
  const factoryAddress = useMemo(() => {
    const c = contractConfigs.find(c => c.name === 'YTAssetFactory' && c.chain_id === product.chainId);
    return c?.address as `0x${string}` | undefined;
  }, [contractConfigs, product.chainId]);

  const { data: vaultInfo, isLoading: isVaultLoading } = useReadContract({
    address: factoryAddress,
    abi: abis.YTAssetFactory as any,
    functionName: 'getVaultInfo',
    args: product.contractAddress ? [product.contractAddress as `0x${string}`] : undefined,
    chainId: product.chainId,
    query: { enabled: !!factoryAddress && !!product.contractAddress },
  });

  const [vaultTimedOut, setVaultTimedOut] = useState(false);
  useEffect(() => {
    if (!factoryAddress || !product.contractAddress) return;
    setVaultTimedOut(false);
    const timer = setTimeout(() => setVaultTimedOut(true), 3000);
    return () => clearTimeout(timer);
  }, [factoryAddress, product.contractAddress]);

  const totalSupply: bigint = vaultInfo ? ((vaultInfo as any[])[4] as bigint) ?? 0n : 0n;
  const hardCap: bigint    = vaultInfo ? ((vaultInfo as any[])[5] as bigint) ?? 0n : 0n;
  const nextRedemptionTime = vaultInfo ? Number((vaultInfo as any[])[8]) : 0;
  const isMatured = nextRedemptionTime > 0 && nextRedemptionTime * 1000 < Date.now();
  const isFull    = hardCap > 0n && totalSupply >= hardCap;

  type StatusCfg = { label: string; dot: string; bg: string; border: string; text: string };
  const statusCfg: StatusCfg | null = (() => {
    if (isVaultLoading && !vaultTimedOut) return null;
    if (isMatured) return { label: t("product.statusEnded"), dot: "bg-gray-400", bg: "bg-gray-100 dark:bg-gray-700", border: "border-gray-300 dark:border-gray-500", text: "text-gray-500 dark:text-gray-400" };
    if (isFull)    return { label: t("product.statusFull"),   dot: "bg-orange-500", bg: "bg-orange-50 dark:bg-orange-900/30", border: "border-orange-200 dark:border-orange-700", text: "text-orange-600 dark:text-orange-400" };
    return           { label: t("product.statusActive"),  dot: "bg-green-500",  bg: "bg-green-50 dark:bg-green-900/30",  border: "border-green-200 dark:border-green-700",  text: "text-green-600 dark:text-green-400" };
  })();

  const shortenAddress = (address: string) => {
    if (!address || address.length < 10) return address;
    return `${address.slice(0, 6)}...${address.slice(-4)}`;
  };

  const contractAddress = product.contractAddress || '';

  const handleCopy = async () => {
    if (!contractAddress) return;
    try {
      if (navigator.clipboard) {
        await navigator.clipboard.writeText(contractAddress);
      } else {
        // fallback for insecure context (HTTP)
        const textarea = document.createElement('textarea');
        textarea.value = contractAddress;
        textarea.style.position = 'fixed';
        textarea.style.opacity = '0';
        document.body.appendChild(textarea);
        textarea.select();
        document.execCommand('copy');
        document.body.removeChild(textarea);
      }
      setCopied(true);
      toast.success(t("product.addressCopied") || "Contract address copied!");
      setTimeout(() => setCopied(false), 2000);
    } catch {
      toast.error(t("product.copyFailed") || "Failed to copy address");
    }
  };

  return (
    <div className="flex flex-col gap-6">
      {/* Product Title Section */}
      <div className="flex flex-col md:flex-row md:items-start md:justify-between gap-4">
        <div className="flex gap-4 md:gap-6">
          <div className="flex-shrink-0">
            <Image
              src={product.iconUrl || '/assets/tokens/default.svg'}
              alt={product.name}
              width={80}
              height={80}
            />
          </div>
          <div className="flex flex-col gap-2">
            <div className="flex items-center gap-2 flex-wrap">
              <h1 className="text-heading-h2 font-bold text-text-primary dark:text-white">
                {product.name}
              </h1>
              {statusCfg && (
                <div className={`inline-flex items-center gap-1.5 rounded-full border px-3 py-1 ${statusCfg.bg} ${statusCfg.border}`}>
                  <span className={`w-2 h-2 rounded-full flex-shrink-0 ${statusCfg.dot}`} />
                  <span className={`text-caption-tiny font-semibold ${statusCfg.text}`}>
                    {statusCfg.label}
                  </span>
                </div>
              )}
            </div>
            <p className="text-body-default font-regular text-text-tertiary dark:text-gray-400">
              {product.subtitle}
            </p>
          </div>
        </div>
        <button
          onClick={handleCopy}
          disabled={!contractAddress}
          title={contractAddress || ''}
          className="self-start"
          style={{
            display: 'flex',
            alignItems: 'center',
            gap: '6px',
            padding: '6px 12px',
            borderRadius: '9999px',
            border: '1px solid #CADFFF',
            backgroundColor: '#EBF2FF',
            color: '#1447E6',
            cursor: contractAddress ? 'pointer' : 'not-allowed',
            opacity: contractAddress ? 1 : 0.4,
            flexShrink: 0,
          }}
        >
          {copied ? (
            <svg width="14" height="14" viewBox="0 0 14 14" fill="none" style={{ color: '#22c55e', flexShrink: 0 }}>
              <path d="M2 7l3.5 3.5L12 3" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round"/>
            </svg>
          ) : (
            <svg width="14" height="14" viewBox="0 0 14 14" fill="none" style={{ color: '#1447E6', flexShrink: 0 }}>
              <rect x="4" y="4" width="8" height="8" rx="1.5" stroke="currentColor" strokeWidth="1.2"/>
              <path d="M4 3.5V3a1.5 1.5 0 0 1 1.5-1.5H11A1.5 1.5 0 0 1 12.5 3v5.5A1.5 1.5 0 0 1 11 10h-.5" stroke="currentColor" strokeWidth="1.2" strokeLinecap="round"/>
            </svg>
          )}
          <span className="text-caption-tiny font-medium font-inter">
            {t("product.contractAddress")}: {shortenAddress(contractAddress) || '--'}
          </span>
        </button>
      </div>
    </div>
  );
}