import { AlertTriangle, Database, RefreshCw } from "lucide-react"
import { useState } from "react"

import { useHomeOverview } from "@/features/home/api/home.query"
import { Button } from "@/shared/ui/button"
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "@/shared/ui/card"
import { Skeleton } from "@/shared/ui/skeleton"

import { FailedStocksDialog } from "../components/failed-stocks-dialog"
import { HomeShell } from "../components/home-shell"
import { MarketDataOverviewCard } from "../components/market-data-overview-card"

export function HomePage() {
  const overview = useHomeOverview()
  const [failureDialogOpen, setFailureDialogOpen] = useState(false)
  const update = overview.data?.latest_update

  return (
    <HomeShell activeSection="home">
      <div className="space-y-8">
        <section className="space-y-2">
          <p className="text-sm font-medium text-primary">欢迎回到知行量化</p>
          <h1 className="text-3xl font-semibold tracking-tight">首页</h1>
          <p className="max-w-2xl text-muted-foreground">
            从当前目标股票池和市场数据同步状态开始，快速判断研究数据是否准备就绪。
          </p>
        </section>

        {overview.isPending ? <OverviewLoading /> : null}

        {overview.isError ? (
          <OverviewError onRetry={() => void overview.refetch()} />
        ) : null}

        {!overview.isPending &&
        !overview.isError &&
        overview.data?.status === "no_data" ? (
          <NoDataState stockPoolCount={overview.data.stock_pool_count} />
        ) : null}

        {!overview.isPending && !overview.isError && update ? (
          <MarketDataOverviewCard
            onShowFailures={() => setFailureDialogOpen(true)}
            stockPoolCount={overview.data.stock_pool_count}
            update={update}
          />
        ) : null}

        {update ? (
          <FailedStocksDialog
            failures={update.failures}
            onOpenChange={setFailureDialogOpen}
            open={failureDialogOpen}
          />
        ) : null}
      </div>
    </HomeShell>
  )
}

function OverviewLoading() {
  return (
    <Card aria-label="正在加载市场数据概览">
      <CardHeader className="gap-3">
        <Skeleton className="h-6 w-48" />
        <Skeleton className="h-4 w-72 max-w-full" />
      </CardHeader>
      <CardContent className="space-y-6">
        <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-4">
          {Array.from({ length: 5 }, (_, index) => (
            <Skeleton key={index} className="h-16 w-full" />
          ))}
        </div>
        <Skeleton className="h-24 w-full" />
      </CardContent>
    </Card>
  )
}

function OverviewError({ onRetry }: { onRetry: () => void }) {
  return (
    <Card>
      <CardHeader>
        <CardTitle className="flex items-center gap-2 text-xl">
          <AlertTriangle
            className="size-5 text-destructive"
            aria-hidden="true"
          />
          市场数据暂时不可用
        </CardTitle>
        <CardDescription>
          概览请求失败，可能是服务或网络暂时异常。请稍后重试。
        </CardDescription>
      </CardHeader>
      <CardContent>
        <Button onClick={onRetry} variant="outline">
          <RefreshCw aria-hidden="true" />
          重试
        </Button>
      </CardContent>
    </Card>
  )
}

function NoDataState({ stockPoolCount }: { stockPoolCount: number }) {
  return (
    <Card>
      <CardHeader>
        <CardTitle className="flex items-center gap-2 text-xl">
          <Database className="size-5 text-primary" aria-hidden="true" />
          暂无市场数据
        </CardTitle>
        <CardDescription>
          当前还没有同步批次，完成第一次同步后这里会显示更新详情。
        </CardDescription>
      </CardHeader>
      <CardContent>
        <p className="text-sm text-muted-foreground">
          当前目标股票池：
          <span className="font-semibold text-foreground">
            {stockPoolCount}
          </span>{" "}
          只
        </p>
      </CardContent>
    </Card>
  )
}