'use client'

import { useMemo } from 'react'

interface StatsChartProps {
  data: number[]
  maxDataPoints?: number
  height?: number
  label: string
  value: string
  subValue?: string
  color: 'cyan' | 'emerald' | 'amber' | 'red'
  maxY?: number
  unit?: string
}

const COLORS = {
  cyan: { stroke: '#06b6d4', fill: 'rgba(6, 182, 212, 0.15)', text: 'text-cyan-400', bg: 'bg-cyan-500/20' },
  emerald: { stroke: '#10b981', fill: 'rgba(16, 185, 129, 0.15)', text: 'text-emerald-400', bg: 'bg-emerald-500/20' },
  amber: { stroke: '#f59e0b', fill: 'rgba(245, 158, 11, 0.15)', text: 'text-amber-400', bg: 'bg-amber-500/20' },
  red: { stroke: '#ef4444', fill: 'rgba(239, 68, 68, 0.15)', text: 'text-red-400', bg: 'bg-red-500/20' },
}

export default function StatsChart({
  data,
  maxDataPoints = 60,
  height = 120,
  label,
  value,
  subValue,
  color,
  maxY = 100,
  unit = '%',
}: StatsChartProps) {
  const theme = COLORS[color]

  const { linePath, areaPath } = useMemo(() => {
    if (data.length < 2) return { linePath: '', areaPath: '' }

    const w = 400
    const h = height
    const padding = 2
    const effectiveH = h - padding * 2
    const clampedMax = Math.max(maxY, 1)

    const points = data.map((val, i) => {
      const x = (i / (maxDataPoints - 1)) * w
      const y = padding + effectiveH - (Math.min(val, clampedMax) / clampedMax) * effectiveH
      return { x, y }
    })

    // Smooth the line with quadratic bezier curves
    let line = `M ${points[0].x},${points[0].y}`
    for (let i = 1; i < points.length; i++) {
      const prev = points[i - 1]
      const curr = points[i]
      const cpx = (prev.x + curr.x) / 2
      line += ` Q ${cpx},${prev.y} ${curr.x},${curr.y}`
    }

    const lastPoint = points[points.length - 1]
    const firstPoint = points[0]
    const area = `${line} L ${lastPoint.x},${h} L ${firstPoint.x},${h} Z`

    return { linePath: line, areaPath: area }
  }, [data, maxDataPoints, height, maxY])

  return (
    <div className="glass rounded-xl p-4 overflow-hidden">
      {/* Header */}
      <div className="flex items-center justify-between mb-3">
        <div className="flex items-center gap-2">
          <div className={`w-2 h-2 rounded-full ${theme.bg}`}>
            <div className={`w-2 h-2 rounded-full animate-pulse`} style={{ backgroundColor: theme.stroke }} />
          </div>
          <span className="text-xs font-medium text-gray-400 uppercase tracking-wider">{label}</span>
        </div>
        <div className="text-right">
          <span className={`text-lg font-semibold ${theme.text}`}>{value}</span>
          {subValue && (
            <span className="text-xs text-gray-500 ml-1">{subValue}</span>
          )}
        </div>
      </div>

      {/* Chart */}
      <div className="relative" style={{ height }}>
        {data.length < 2 ? (
          <div className="flex items-center justify-center h-full">
            <span className="text-xs text-gray-600">Collecting data…</span>
          </div>
        ) : (
          <svg
            viewBox={`0 0 400 ${height}`}
            preserveAspectRatio="none"
            className="w-full h-full"
          >
            {/* Grid lines */}
            {[0, 0.25, 0.5, 0.75, 1].map((pct) => (
              <line
                key={pct}
                x1={0}
                y1={2 + (height - 4) * pct}
                x2={400}
                y2={2 + (height - 4) * pct}
                stroke="rgba(55, 65, 81, 0.3)"
                strokeWidth={0.5}
              />
            ))}

            {/* Area fill */}
            <path d={areaPath} fill={theme.fill} />

            {/* Line */}
            <path d={linePath} fill="none" stroke={theme.stroke} strokeWidth={2} strokeLinecap="round" strokeLinejoin="round" />
          </svg>
        )}

        {/* Y-axis labels */}
        <div className="absolute top-0 left-0 h-full flex flex-col justify-between pointer-events-none py-0.5">
          <span className="text-[10px] text-gray-600">{maxY}{unit}</span>
          <span className="text-[10px] text-gray-600">0{unit}</span>
        </div>
      </div>
    </div>
  )
}