'use client'
import {
  PieChart,
  Pie,
  Cell,
  Tooltip,
  Legend,
  ResponsiveContainer,
} from 'recharts'
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'

interface StatusDataPoint {
  status: string
  count: number
}

interface StatusBreakdownProps {
  data: StatusDataPoint[]
}

const STATUS_COLORS: Record<string, string> = {
  PENDING: '#8884d8',
  UNDER_REVIEW: '#82ca9d',
  SHORTLISTED: '#ffc658',
  SEMIFINALIST: '#ff7300',
  FINALIST: '#00C49F',
  WINNER: '#0088FE',
  ELIMINATED: '#de0f1e',
  WITHDRAWN: '#999999',
}

const renderCustomLabel = ({
  cx,
  cy,
  midAngle,
  innerRadius,
  outerRadius,
  percent,
}: {
  cx?: number
  cy?: number
  midAngle?: number
  innerRadius?: number
  outerRadius?: number
  percent?: number
}) => {
  if (cx === undefined || cy === undefined || midAngle === undefined ||
      innerRadius === undefined || outerRadius === undefined || percent === undefined) {
    return null
  }
  if (percent < 0.05) return null // Don't show labels for small slices

  const RADIAN = Math.PI / 180
  const radius = innerRadius + (outerRadius - innerRadius) * 0.5
  const x = cx + radius * Math.cos(-midAngle * RADIAN)
  const y = cy + radius * Math.sin(-midAngle * RADIAN)

  return (
    <text
      x={x}
      y={y}
      fill="white"
      textAnchor={x > cx ? 'start' : 'end'}
      dominantBaseline="central"
      fontSize={12}
      fontWeight={600}
    >
      {`${(percent * 100).toFixed(0)}%`}
    </text>
  )
}

export function StatusBreakdownChart({ data }: StatusBreakdownProps) {
  const total = data.reduce((sum, item) => sum + item.count, 0)

  // Format status for display
  const formattedData = data.map((d) => ({
    ...d,
    name: d.status.replace(/_/g, ' '),
    color: STATUS_COLORS[d.status] || '#8884d8',
  }))

  return (
    <Card>
      <CardHeader>
        <CardTitle className="flex items-center justify-between">
          <span>Project Status Distribution</span>
          <span className="text-sm font-normal text-muted-foreground">
            {total} projects
          </span>
        </CardTitle>
      </CardHeader>
      <CardContent>
        <div className="h-[300px]">
          <ResponsiveContainer width="100%" height="100%">
            <PieChart>
              <Pie
                data={formattedData}
                cx="50%"
                cy="50%"
                labelLine={false}
                label={renderCustomLabel}
                outerRadius={100}
                innerRadius={50}
                fill="#8884d8"
                dataKey="count"
                nameKey="name"
              >
                {formattedData.map((entry, index) => (
                  <Cell key={`cell-${index}`} fill={entry.color} />
                ))}
              </Pie>
              <Tooltip
                contentStyle={{
                  backgroundColor: 'hsl(var(--card))',
                  border: '1px solid hsl(var(--border))',
                  borderRadius: '6px',
                }}
                formatter={(value: number | undefined, name: string | undefined) => [
                  `${value ?? 0} (${(((value ?? 0) / total) * 100).toFixed(1)}%)`,
                  name ?? '',
                ]}
              />
              <Legend />
            </PieChart>
          </ResponsiveContainer>
        </div>
      </CardContent>
    </Card>
  )
}