Step area chart with dotted pattern fill

<!--
  Замена библиотеки: см. c-chart-13.vue / docs/PORTING.md §19/§27. Точечный
  SVG-паттерн заливки не переносится — сплошная градиентная заливка
  по умолчанию у `AreaChart`.
-->
<script setup lang="ts">
import { AreaChart, CurveType } from "vue-chrts"
import { Badge } from "@/components/reui/badge"
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card"
import { ChartContainer, type ChartConfig } from "@/components/ui/chart"

const chartData = [
  { month: "January", connections: 48 },
  { month: "February", connections: 62 },
  { month: "March", connections: 62 },
  { month: "April", connections: 85 },
  { month: "May", connections: 85 },
  { month: "June", connections: 110 },
  { month: "July", connections: 110 },
  { month: "August", connections: 135 },
]

const chartConfig = {
  connections: { label: "Connections", color: "var(--chart-2)" },
} satisfies ChartConfig

const categories = { connections: { name: "Connections", color: "var(--chart-2)" } }

function xFormatter(tick: number) {
  return chartData[tick]?.month.slice(0, 3) ?? ""
}
</script>

<template>
  <Card class="w-full max-w-md">
    <CardHeader>
      <CardTitle>
        Active Connections
        <Badge variant="success-light" class="ml-2">
          <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true" class="lucide lucide-trending-up">
            <path d="M16 7h6v6" />
            <path d="m22 7-8.5 8.5-5-5L2 17" />
          </svg>
          +257%
        </Badge>
      </CardTitle>
      <CardDescription>Server connection pool over time</CardDescription>
    </CardHeader>
    <CardContent>
      <ChartContainer :config="chartConfig">
        <AreaChart
          :data="chartData"
          :categories="categories"
          :height="200"
          :x-formatter="xFormatter"
          :curve-type="CurveType.StepAfter"
          :line-width="2"
          :duration="0"
          hide-tooltip
          hide-legend
        />
      </ChartContainer>
    </CardContent>
  </Card>
</template>