import { BarChart3, TrendingDown, TrendingUp } from "lucide-react";
import { RefreshCcw } from "lucide-react";
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import type { DashboardMarketIndexItem } from "@/features/dashboard/types/dashboard.types";
import { Button } from "@/components/ui/button";
import {
  formatCurrency,
  formatSignedCurrency,
  formatSignedPercent,
} from "@/features/dashboard/utils/dashboard-format";
import { cn } from "@/lib/utils";
import { usePriceFlash } from "@/features/dashboard/hooks/use-price-flash";

interface MarketSummaryProps {
  items: DashboardMarketIndexItem[];
  isLoading: boolean;
  error: string | null;
  warning?: string | null;
  isRealtimePending?: boolean;
  onRetry?: () => void;
}

/**
 * @description 코스피/코스닥 지수 요약 카드입니다.
 * @see features/dashboard/components/DashboardContainer.tsx 우측 상단 영역에서 호출합니다.
 */
export function MarketSummary({
  items,
  isLoading,
  error,
  warning = null,
  isRealtimePending = false,
  onRetry,
}: MarketSummaryProps) {
  return (
    <Card className="overflow-hidden border-brand-200/80 bg-linear-to-br from-brand-50/50 to-background dark:border-brand-800/45 dark:from-brand-950/20 dark:to-background">
      <CardHeader className="pb-2">
        <div className="flex items-center justify-between">
          <CardTitle className="flex items-center gap-2 text-base text-brand-700 dark:text-brand-300">
            <BarChart3 className="h-4 w-4" />
            시장 지수
          </CardTitle>
        </div>
        <CardDescription>실시간 코스피/코스닥 지수 현황입니다.</CardDescription>
      </CardHeader>

      <CardContent className="grid gap-3 sm:grid-cols-2 lg:grid-cols-1 xl:grid-cols-2">
        {/* ========== LOADING STATE ========== */}
        {isLoading && items.length === 0 && (
          <div className="col-span-full py-4 text-center text-sm text-muted-foreground animate-pulse">
            지수 데이터를 불러오는 중입니다...
          </div>
        )}

        {/* ========== REALTIME PENDING STATE ========== */}
        {isRealtimePending && items.length === 0 && !isLoading && !error && (
          <div className="col-span-full rounded-md bg-amber-50 p-3 text-sm text-amber-700 dark:bg-amber-950/25 dark:text-amber-400">
            실시간 시세 연결은 완료되었고 첫 지수 데이터를 기다리는 중입니다.
          </div>
        )}

        {/* ========== ERROR/WARNING STATE ========== */}
        {error && (
          <div className="col-span-full rounded-md bg-red-50 p-3 text-sm text-red-600 dark:bg-red-950/30 dark:text-red-400">
            <p>지수 정보를 가져오는데 실패했습니다.</p>
            <p className="mt-1 text-xs opacity-80">
              {toCompactErrorMessage(error)}
            </p>
            <p className="mt-1 text-xs opacity-80">
              토큰이 정상이어도 한국투자증권 API 점검/지연 시 일시적으로 실패할 수 있습니다.
            </p>
            {onRetry ? (
              <Button
                type="button"
                size="sm"
                variant="outline"
                onClick={onRetry}
                className="mt-2 border-red-300 text-red-700 hover:bg-red-100 dark:border-red-700 dark:text-red-300 dark:hover:bg-red-900/40"
              >
                <RefreshCcw className="mr-1.5 h-3.5 w-3.5" />
                지수 다시 불러오기
              </Button>
            ) : null}
          </div>
        )}
        {!error && warning && (
          <div className="col-span-full rounded-md bg-amber-50 p-3 text-sm text-amber-700 dark:bg-amber-950/25 dark:text-amber-400">
            {warning}
          </div>
        )}

        {/* ========== INDEX CARDS ========== */}
        {items.map((item) => (
          <IndexItem key={item.code} item={item} />
        ))}

        {!isLoading && items.length === 0 && !error && (
          <div className="col-span-full py-4 text-center text-sm text-muted-foreground">
            표시할 데이터가 없습니다.
          </div>
        )}
      </CardContent>
    </Card>
  );
}

/**
 * @description 길고 복잡한 서버 오류를 대시보드 카드에 맞는 짧은 문구로 축약합니다.
 * @param error 원본 오류 문자열
 * @returns 화면 노출용 오류 메시지
 * @see features/dashboard/components/MarketSummary.tsx 지수 오류 배너 상세 문구
 */
function toCompactErrorMessage(error: string) {
  const normalized = error.replaceAll(/\s+/g, " ").trim();
  if (!normalized) return "잠시 후 다시 시도해 주세요.";
  if (normalized.length <= 120) return normalized;
  return `${normalized.slice(0, 120)}...`;
}

function IndexItem({ item }: { item: DashboardMarketIndexItem }) {
  const isUp = item.change > 0;
  const isDown = item.change < 0;
  const toneClass = isUp
    ? "text-red-600 dark:text-red-400"
    : isDown
      ? "text-blue-600 dark:text-blue-400"
      : "text-muted-foreground";

  const bgClass = isUp
    ? "bg-red-50/50 dark:bg-red-950/10 border-red-100 dark:border-red-900/30"
    : isDown
      ? "bg-blue-50/50 dark:bg-blue-950/10 border-blue-100 dark:border-blue-900/30"
      : "bg-muted/50 border-border/50";

  const flash = usePriceFlash(item.price, item.code);

  return (
    <div
      className={cn(
        "relative flex flex-col justify-between rounded-xl border p-4 transition-all hover:bg-background/80",
        bgClass,
      )}
    >
      <div className="flex items-center justify-between">
        <span className="text-sm font-medium text-muted-foreground">
          {item.market}
        </span>
        {isUp ? (
          <TrendingUp className="h-4 w-4 text-red-500/70" />
        ) : isDown ? (
          <TrendingDown className="h-4 w-4 text-blue-500/70" />
        ) : null}
      </div>

      <div className="mt-2 text-2xl font-bold tracking-tight relative w-fit">
        {formatCurrency(item.price)}

        {/* Flash Indicator */}
        {flash && (
          <div
            key={flash.id} // Force re-render for animation restart using state ID
            className={cn(
              "absolute left-full top-1 ml-2 text-sm font-bold animate-out fade-out slide-out-to-top-2 duration-1000 fill-mode-forwards pointer-events-none whitespace-nowrap",
              flash.type === "up" ? "text-red-500" : "text-blue-500",
            )}
          >
            {flash.type === "up" ? "+" : ""}
            {flash.val.toFixed(2)}
          </div>
        )}
      </div>

      <div
        className={cn(
          "mt-1 flex items-center gap-2 text-sm font-medium",
          toneClass,
        )}
      >
        <span>{formatSignedCurrency(item.change)}</span>
        <span className="rounded-md bg-background/50 px-1.5 py-0.5 text-xs shadow-sm">
          {formatSignedPercent(item.changeRate)}
        </span>
      </div>
    </div>
  );
}