"use client"

import { BarChart3 } from "lucide-react"
import {
  Bar,
  BarChart,
  CartesianGrid,
  Legend,
  XAxis,
  YAxis,
} from "recharts"

import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "@/shared/components/ui/card"
import {
  ChartContainer,
  ChartTooltip,
  ChartTooltipContent,
} from "@/shared/components/ui/chart"
import { EmptyState } from "@/shared/components/ui/empty-state"
import type { ClassComparisonItem } from "@/modules/grades/types"

const chartConfig = {
  averageScore: { label: "Average (%)", color: "hsl(var(--primary))" },
  passRate: { label: "Pass Rate (%)", color: "hsl(var(--chart-2))" },
  excellentRate: { label: "Excellent (%)", color: "hsl(var(--chart-3))" },
}

interface ClassComparisonChartProps {
  data: ClassComparisonItem[]
}

export function ClassComparisonChart({ data }: ClassComparisonChartProps) {
  if (!data || data.length === 0) {
    return (
      <Card>
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <BarChart3 className="h-4 w-4" />
            Class Comparison
          </CardTitle>
          <CardDescription>
            Compare average, pass rate, and excellent rate across classes.
          </CardDescription>
        </CardHeader>
        <CardContent>
          <EmptyState
            icon={BarChart3}
            title="No comparison data"
            description="Select a grade and subject to compare classes."
            className="border-none h-60"
          />
        </CardContent>
      </Card>
    )
  }

  const chartData = data.map((d) => ({
    name: d.className,
    averageScore: d.averageScore,
    passRate: d.passRate,
    excellentRate: d.excellentRate,
    count: d.count,
    studentCount: d.studentCount,
  }))

  return (
    <Card>
      <CardHeader>
        <CardTitle className="flex items-center gap-2">
          <BarChart3 className="h-4 w-4" />
          Class Comparison
        </CardTitle>
        <CardDescription>
          Average score, pass rate (≥60%), and excellent rate (≥85%) per class.
        </CardDescription>
      </CardHeader>
      <CardContent>
        <ChartContainer config={chartConfig} className="h-[300px] w-full">
          <BarChart
            data={chartData}
            margin={{ left: 8, right: 8, top: 8, bottom: 8 }}
          >
            <CartesianGrid
              vertical={false}
              strokeDasharray="4 4"
              strokeOpacity={0.4}
            />
            <XAxis
              dataKey="name"
              tickLine={false}
              axisLine={false}
              tickMargin={8}
              tickFormatter={(value: string) =>
                value.length > 8 ? `${value.slice(0, 8)}...` : value
              }
            />
            <YAxis
              domain={[0, 100]}
              tickLine={false}
              axisLine={false}
              tickFormatter={(value: number) => `${value}%`}
              width={36}
            />
            <ChartTooltip content={<ChartTooltipContent className="w-[240px]" />} />
            <Legend />
            <Bar
              dataKey="averageScore"
              fill="var(--color-averageScore)"
              radius={[4, 4, 0, 0]}
            />
            <Bar
              dataKey="passRate"
              fill="var(--color-passRate)"
              radius={[4, 4, 0, 0]}
            />
            <Bar
              dataKey="excellentRate"
              fill="var(--color-excellentRate)"
              radius={[4, 4, 0, 0]}
            />
          </BarChart>
        </ChartContainer>
      </CardContent>
    </Card>
  )
}