"use client";

import { useEffect } from "react";
import { useSiteInspectionStore } from "@/stores/useSiteInspectionStore";
import { useSiteInspectionSSE } from "@/hooks/useSiteInspectionSSE";
import { useSiteInspectionResult } from "@/lib/queries";
import { Progress } from "@/components/ui/progress";
import { Card, CardContent } from "@/components/ui/card";
import { ErrorState } from "@/components/common/ErrorState";
import {
  Globe,
  Search,
  Check,
  X,
  Circle,
  Loader2,
  ExternalLink,
} from "lucide-react";
import { cn } from "@/lib/utils";
import { getScoreTailwindColor } from "@/lib/constants";
import type { DiscoveredPage } from "@/types/site-inspection";

interface SiteCrawlProgressProps {
  siteInspectionId: string;
}

/**
 * 사이트 크롤링 검사 진행 상태 표시 컴포넌트.
 * 크롤링 단계와 검사 단계를 시각적으로 표현한다.
 */
export function SiteCrawlProgress({
  siteInspectionId,
}: SiteCrawlProgressProps) {
  const {
    status,
    rootUrl,
    crawlProgress,
    discoveredPages,
    aggregateScores,
    errorMessage,
    initFromApi,
  } = useSiteInspectionStore();

  // API에서 현재 상태 조회 (리로드 시 스토어 복원용)
  const { data: apiResult } = useSiteInspectionResult(siteInspectionId);

  useEffect(() => {
    if (apiResult && status === "idle") {
      initFromApi(apiResult);
    }
  }, [apiResult, status, initFromApi]);

  // SSE 연결
  useSiteInspectionSSE(siteInspectionId);

  const handleRetry = () => {
    window.location.reload();
  };

  // 전체 진행률 계산
  const completedPages = discoveredPages.filter(
    (p) => p.status === "completed"
  ).length;
  const totalPages = discoveredPages.length;
  const overallProgress =
    totalPages > 0 ? Math.round((completedPages / totalPages) * 100) : 0;

  return (
    <div className="max-w-2xl mx-auto">
      {/* URL 표시 */}
      {rootUrl && (
        <div className="flex items-center gap-2 mb-6 text-muted-foreground">
          <ExternalLink className="h-4 w-4" />
          <span className="text-sm truncate">{rootUrl}</span>
        </div>
      )}

      {/* 크롤링 단계 */}
      {status === "crawling" && (
        <CrawlPhase
          pagesFound={crawlProgress?.pagesFound ?? 0}
          currentUrl={crawlProgress?.currentUrl ?? ""}
        />
      )}

      {/* 검사 단계 */}
      {(status === "inspecting" || status === "completed") && (
        <InspectionPhase
          pages={discoveredPages}
          completedPages={completedPages}
          totalPages={totalPages}
          overallProgress={overallProgress}
          aggregateScores={aggregateScores}
        />
      )}

      {/* 에러 상태 */}
      {status === "error" && (
        <div className="mt-6">
          <ErrorState
            message={errorMessage || "사이트 검사 중 오류가 발생했습니다"}
            onRetry={handleRetry}
          />
        </div>
      )}

      {/* 초기 연결 중 상태 */}
      {status === "idle" && (
        <div className="flex flex-col items-center py-12">
          <Loader2 className="h-8 w-8 animate-spin text-primary" />
          <p className="mt-3 text-sm text-muted-foreground">
            서버에 연결하는 중...
          </p>
        </div>
      )}
    </div>
  );
}

/** 크롤링 단계 UI */
function CrawlPhase({
  pagesFound,
  currentUrl,
}: {
  pagesFound: number;
  currentUrl: string;
}) {
  return (
    <Card>
      <CardContent className="pt-6">
        <div className="flex items-center gap-3 mb-4">
          <div className="relative">
            <Globe className="h-8 w-8 text-primary" />
            <Search className="h-4 w-4 text-primary absolute -bottom-1 -right-1 animate-pulse" />
          </div>
          <div>
            <h3 className="font-semibold">사이트 링크 수집 중...</h3>
            <p className="text-sm text-muted-foreground">
              {pagesFound}개 페이지 발견
            </p>
          </div>
        </div>

        {/* 크롤링 진행 바 (무한 애니메이션) */}
        <div className="relative h-2 w-full overflow-hidden rounded-full bg-secondary mb-3">
          <div className="h-full w-1/3 bg-primary rounded-full animate-crawl-progress" />
        </div>

        {/* 현재 크롤링 중인 URL */}
        {currentUrl && (
          <p className="text-xs text-muted-foreground truncate">
            {currentUrl}
          </p>
        )}
      </CardContent>
    </Card>
  );
}

/** 검사 단계 UI */
function InspectionPhase({
  pages,
  completedPages,
  totalPages,
  overallProgress,
  aggregateScores,
}: {
  pages: DiscoveredPage[];
  completedPages: number;
  totalPages: number;
  overallProgress: number;
  aggregateScores: { overall_score: number; grade: string } | null;
}) {
  return (
    <div>
      {/* 전체 진행률 */}
      <Card className="mb-4">
        <CardContent className="pt-6">
          <div className="flex items-center justify-between mb-2">
            <h3 className="font-semibold">페이지 검사 진행</h3>
            <span className="text-sm text-muted-foreground">
              {completedPages}/{totalPages}
            </span>
          </div>
          <Progress value={overallProgress} className="h-3" />
          <div className="flex items-center justify-between mt-2">
            <span className="text-xs text-muted-foreground">
              {overallProgress}% 완료
            </span>
            {aggregateScores && (
              <span
                className={cn(
                  "text-xs font-bold",
                  getScoreTailwindColor(aggregateScores.overall_score)
                )}
              >
                현재 평균: {aggregateScores.overall_score}점{" "}
                {aggregateScores.grade}
              </span>
            )}
          </div>
        </CardContent>
      </Card>

      {/* 개별 페이지 목록 */}
      <div className="space-y-1.5">
        {pages.map((page) => (
          <PageProgressItem key={page.url} page={page} />
        ))}
      </div>
    </div>
  );
}

/** 개별 페이지 진행 항목 */
function PageProgressItem({ page }: { page: DiscoveredPage }) {
  let displayPath: string;
  try {
    const parsed = new URL(page.url);
    displayPath = parsed.pathname + parsed.search || "/";
  } catch {
    displayPath = page.url;
  }

  return (
    <div className="flex items-center gap-2 px-3 py-2 rounded-md bg-muted/30">
      {/* 상태 아이콘 */}
      <PageStatusIcon status={page.status} />

      {/* URL 경로 */}
      <span className="text-sm truncate flex-1 min-w-0" title={page.url}>
        {displayPath}
      </span>

      {/* 점수 (완료 시) */}
      {page.status === "completed" && page.overall_score !== null && (
        <span
          className={cn(
            "text-xs font-bold flex-shrink-0",
            getScoreTailwindColor(page.overall_score)
          )}
        >
          {page.overall_score}점
        </span>
      )}

      {/* 검사 중 표시 */}
      {page.status === "inspecting" && (
        <span className="text-xs text-blue-500 flex-shrink-0">검사 중</span>
      )}
    </div>
  );
}

/** 페이지 상태 아이콘 */
function PageStatusIcon({ status }: { status: DiscoveredPage["status"] }) {
  switch (status) {
    case "pending":
      return <Circle className="h-4 w-4 flex-shrink-0 text-muted-foreground/50" />;
    case "inspecting":
      return (
        <Loader2 className="h-4 w-4 flex-shrink-0 text-blue-500 animate-spin" />
      );
    case "completed":
      return <Check className="h-4 w-4 flex-shrink-0 text-green-500" />;
    case "error":
      return <X className="h-4 w-4 flex-shrink-0 text-red-500" />;
    default:
      return <Circle className="h-4 w-4 flex-shrink-0 text-muted-foreground/50" />;
  }
}