import { Activity, Boxes, ExternalLink, FileKey, GitBranch, RefreshCw } from 'lucide-react';
import { useEffect, useMemo, useState } from 'react';
import { Badge, Button, Card, CardHeader } from '../../components/ui';
import { PageTitle } from '../../layout/AppLayout';
import { apiRequest } from '../../lib/api';
import { cn } from '../../lib/utils';

type CommonAppPipeline = {
  id: string;
  repository: string;
  message: string;
  branch: string;
  status: string;
  createdAt: number;
  url?: string;
};

function relativeTime(timestamp: number) {
  if (!timestamp) return '-';
  const seconds = Math.max(0, Math.floor((Date.now() - timestamp) / 1000));
  if (seconds < 60) return '방금 전';
  const minutes = Math.floor(seconds / 60);
  if (minutes < 60) return `${minutes}분 전`;
  const hours = Math.floor(minutes / 60);
  if (hours < 24) return `${hours}시간 전`;
  const days = Math.floor(hours / 24);
  if (days < 30) return `${days}일 전`;
  return new Intl.DateTimeFormat('ko-KR', { month: 'short', day: 'numeric' }).format(new Date(timestamp));
}

function pipelineTone(status: string): 'neutral' | 'green' | 'amber' | 'red' | 'blue' {
  const normalized = status.toLowerCase();
  if (['success', 'succeeded', 'done'].includes(normalized)) return 'green';
  if (['failure', 'failed', 'error', 'killed'].includes(normalized)) return 'red';
  if (['running', 'started'].includes(normalized)) return 'blue';
  if (['pending', 'blocked', 'created'].includes(normalized)) return 'amber';
  return 'neutral';
}

async function loadCommonAppPipelines(): Promise<CommonAppPipeline[]> {
  const response = await apiRequest<{ repos: CommonAppPipeline[] }>('/woodpecker/repos');
  return response.repos.slice(0, 8);
}

export function DashboardPage() {
  const [commonApps, setCommonApps] = useState<CommonAppPipeline[]>([]);
  const [commonAppsLoading, setCommonAppsLoading] = useState(true);
  const [commonAppsFailed, setCommonAppsFailed] = useState(false);

  const refreshCommonApps = () => {
    setCommonAppsLoading(true);
    loadCommonAppPipelines()
      .then((pipelines) => {
        setCommonApps(pipelines);
        setCommonAppsFailed(false);
      })
      .catch(() => {
        setCommonApps([]);
        setCommonAppsFailed(true);
      })
      .finally(() => setCommonAppsLoading(false));
  };

  useEffect(() => {
    refreshCommonApps();
  }, []);

  const launcherRows = useMemo(
    () => [
      ['최신 버전', '런처 버전 관리'],
      ['빌드/배포', '런처 빌드 관리'],
      ['소스 연결', '런처 소스 관리']
    ],
    []
  );

  return (
    <>
      <PageTitle
        eyebrow="플랫폼 운영"
        title="대시보드"
        description="공통 앱, 런처, 앱, 라이센스, 런타임 상태를 관리하는 스튜디오 어드민 콘솔입니다."
      />
      <div className="grid gap-4 sm:grid-cols-2 xl:grid-cols-3">
        {[
          ['활성 앱', '10', Boxes],
          ['라이센스 사용률', '72%', FileKey],
          ['런타임 정상률', '96.4%', Activity]
        ].map(([label, value, Icon]) => (
          <Card key={label as string} className="p-5">
            <div className="flex items-center justify-between">
              <p className="text-sm text-muted-foreground">{label as string}</p>
              <Icon className="size-4 text-muted-foreground" />
            </div>
            <p className="mt-4 text-3xl font-semibold tracking-tight">{value as string}</p>
          </Card>
        ))}
      </div>
      <div className="mt-4 grid gap-4 xl:grid-cols-2">
        <Card className="min-w-0 overflow-hidden">
          <CardHeader title="런처 버전 관리" description="런처 클라이언트와 런처 백엔드의 버전 기준을 확인합니다." />
          <div className="divide-y divide-border">
            {launcherRows.map(([label, value]) => (
              <div key={label} className="flex items-center justify-between gap-4 px-5 py-4 text-sm">
                <span className="text-muted-foreground">{label}</span>
                <span className="truncate font-semibold">{value}</span>
              </div>
            ))}
          </div>
        </Card>
        <Card className="min-w-0 overflow-hidden">
          <CardHeader
            title="공통앱"
            description="Woodpecker의 모든 저장소를 마지막 파이프라인 생성 순으로 표시합니다."
            action={
              <Button variant="outline" className="size-8 px-0" onClick={refreshCommonApps} disabled={commonAppsLoading} title="새로고침" aria-label="새로고침">
                <RefreshCw className={cn('size-4', commonAppsLoading && 'animate-spin')} />
              </Button>
            }
          />
          <div className="max-h-[420px] overflow-y-auto">
            {commonAppsFailed ? (
              <div className="flex min-h-36 items-center justify-center px-5 text-sm text-rose-300">Woodpecker 저장소를 불러오지 못했습니다.</div>
            ) : commonAppsLoading && commonApps.length === 0 ? (
              <div className="flex min-h-36 items-center justify-center px-5 text-sm text-muted-foreground">저장소를 불러오는 중입니다.</div>
            ) : commonApps.length === 0 ? (
              <div className="flex min-h-36 items-center justify-center px-5 text-sm text-muted-foreground">표시할 저장소가 없습니다.</div>
            ) : (
              <div className="divide-y divide-border">
                {commonApps.map((pipeline) => (
                  <div key={pipeline.id} className="px-5 py-4">
                    <div className="flex items-start justify-between gap-4">
                      <div className="min-w-0">
                        <div className="flex min-w-0 items-center gap-2">
                          <GitBranch className="size-3.5 shrink-0 text-muted-foreground" />
                          <p className="truncate text-sm font-semibold">{pipeline.repository}</p>
                        </div>
                        <p className="mt-1 truncate text-sm text-muted-foreground">{pipeline.message}</p>
                      </div>
                      {pipeline.url ? (
                        <a href={pipeline.url} target="_blank" rel="noreferrer" className="shrink-0 text-muted-foreground hover:text-foreground" aria-label="Woodpecker 저장소 열기">
                          <ExternalLink className="size-4" />
                        </a>
                      ) : null}
                    </div>
                    <div className="mt-3 flex flex-wrap items-center gap-2 text-xs text-muted-foreground">
                      <Badge tone={pipelineTone(pipeline.status)}>{pipeline.status}</Badge>
                      <span>{pipeline.branch}</span>
                      <span>{relativeTime(pipeline.createdAt)}</span>
                    </div>
                  </div>
                ))}
              </div>
            )}
          </div>
        </Card>
      </div>
    </>
  );
}