'use client';

import React, { useState } from 'react';
import { Card, CardContent, CardHeader, CardTitle, CardToolbar } from '@/registry/default/ui/card';
import { ChartConfig, ChartContainer, ChartTooltip } from '@/registry/default/ui/chart';
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/registry/default/ui/select';
import { CreditCard, Eye, ShoppingCart, Store, TrendingDown, TrendingUp } from 'lucide-react';
import { Area, AreaChart, CartesianGrid, XAxis, YAxis } from 'recharts';
import { cn } from '@/lib/utils';

// E-commerce conversion funnel data for different periods
const conversionFunnelData = {
  '7d': [
    { period: 'Mon', storeVisits: 2500, productViews: 2100, addToCart: 1400, checkout: 1200 },
    { period: 'Tue', storeVisits: 2800, productViews: 2300, addToCart: 1600, checkout: 1350 },
    { period: 'Wed', storeVisits: 1900, productViews: 1500, addToCart: 950, checkout: 780 },
    { period: 'Thu', storeVisits: 3100, productViews: 2600, addToCart: 1800, checkout: 1500 },
    { period: 'Fri', storeVisits: 2400, productViews: 1900, addToCart: 1200, checkout: 980 },
    { period: 'Sat', storeVisits: 3400, productViews: 2800, addToCart: 1950, checkout: 1620 },
    { period: 'Sun', storeVisits: 2100, productViews: 1700, addToCart: 1100, checkout: 850 },
  ],
  '30d': [
    { period: 'Week 1', storeVisits: 18500, productViews: 15200, addToCart: 10800, checkout: 8900 },
    { period: 'Week 2', storeVisits: 21200, productViews: 17800, addToCart: 12400, checkout: 10200 },
    { period: 'Week 3', storeVisits: 16800, productViews: 13500, addToCart: 8900, checkout: 7200 },
    { period: 'Week 4', storeVisits: 14200, productViews: 11200, addToCart: 7800, checkout: 6100 },
    { period: 'Week 5', storeVisits: 19800, productViews: 16500, addToCart: 11200, checkout: 9400 },
    { period: 'Week 6', storeVisits: 22800, productViews: 19100, addToCart: 13500, checkout: 11200 },
  ],
  '90d': [
    { period: 'Jan', storeVisits: 78000, productViews: 65000, addToCart: 45000, checkout: 37000 },
    { period: 'Feb', storeVisits: 82000, productViews: 68500, addToCart: 48000, checkout: 39500 },
    { period: 'Mar', storeVisits: 69000, productViews: 54000, addToCart: 36000, checkout: 28500 },
    { period: 'Apr', storeVisits: 61000, productViews: 47000, addToCart: 31000, checkout: 24000 },
    { period: 'May', storeVisits: 75000, productViews: 62000, addToCart: 43000, checkout: 35500 },
    { period: 'Jun', storeVisits: 84000, productViews: 71000, addToCart: 49000, checkout: 41000 },
  ],
  '12m': [
    { period: 'Q1', storeVisits: 235000, productViews: 195000, addToCart: 136000, checkout: 112000 },
    { period: 'Q2', storeVisits: 268000, productViews: 223000, addToCart: 156000, checkout: 128000 },
    { period: 'Q3', storeVisits: 198000, productViews: 158000, addToCart: 105000, checkout: 82000 },
    { period: 'Q4', storeVisits: 175000, productViews: 138000, addToCart: 89000, checkout: 68000 },
    { period: 'Q1 24', storeVisits: 251000, productViews: 209000, addToCart: 146000, checkout: 120000 },
    { period: 'Q2 24', storeVisits: 289000, productViews: 241000, addToCart: 168000, checkout: 138000 },
  ],
};

const chartConfig = {
  storeVisits: {
    label: 'Store Visits',
    color: 'var(--color-indigo-400)',
  },
  productViews: {
    label: 'Product Views',
    color: 'var(--color-indigo-500)',
  },
  addToCart: {
    label: 'Add to Cart',
    color: 'var(--color-indigo-600)',
  },
  checkout: {
    label: 'Checkout',
    color: 'var(--color-indigo-700)',
  },
} satisfies ChartConfig;

// Period configuration
const PERIODS = {
  '7d': { key: '7d', label: 'Last 7 days' },
  '30d': { key: '30d', label: 'Last 30 days' },
  '90d': { key: '90d', label: 'Last 90 days' },
  '12m': { key: '12m', label: 'Last 12 months' },
} as const;

type PeriodKey = keyof typeof PERIODS;

// Define stage metrics
const stageMetrics = [
  { key: 'storeVisits', label: 'Store Visits', icon: Store, color: chartConfig.storeVisits.color },
  { key: 'productViews', label: 'Product Views', icon: Eye, color: chartConfig.productViews.color },
  { key: 'addToCart', label: 'Add to Cart', icon: ShoppingCart, color: chartConfig.addToCart.color },
  { key: 'checkout', label: 'Checkout', icon: CreditCard, color: chartConfig.checkout.color },
] as const;

// Custom Tooltip Component
interface TooltipProps {
  active?: boolean;
  payload?: Array<{
    dataKey: string;
    value: number;
    color: string;
  }>;
  label?: string;
}

const CustomTooltip = ({ active, payload, label }: TooltipProps) => {
  if (active && payload && payload.length) {
    return (
      <div className="rounded-lg border bg-popover/95 backdrop-blur-sm p-4 shadow-lg min-w-[200px]">
        <div className="text-sm font-semibold text-popover-foreground mb-3.5 pb-2 border-b border-border/50">
          {label}
        </div>
        <div className="space-y-1.5">
          {stageMetrics.map((stage) => {
            const dataPoint = payload.find((p) => p.dataKey === stage.key);
            const value = dataPoint?.value || 0;

            return (
              <div key={stage.key} className="flex items-center justify-between gap-1.5">
                <div className="flex items-center gap-2">
                  <div className="size-2.5 rounded-sm" style={{ backgroundColor: stage.color }} />
                  <span className="text-xs font-medium text-muted-foreground">{stage.label}</span>
                </div>
                <span className="text-sm font-semibold text-popover-foreground">{value.toLocaleString()}</span>
              </div>
            );
          })}
        </div>
      </div>
    );
  }
  return null;
};

export default function AreaChart2() {
  const [selectedPeriod, setSelectedPeriod] = useState<PeriodKey>('30d');

  // Get data for selected period
  const currentData = conversionFunnelData[selectedPeriod];

  // Calculate current totals for the latest data point
  const latestData = currentData[currentData.length - 1];

  // Calculate percentage changes (simulated based on period)
  const getChangeForMetric = (metric: string) => {
    const changes = {
      '7d': { storeVisits: -16, productViews: 8, addToCart: -12, checkout: 5 },
      '30d': { storeVisits: 23, productViews: -7, addToCart: 15, checkout: -4 },
      '90d': { storeVisits: 12, productViews: 18, addToCart: -8, checkout: 21 },
      '12m': { storeVisits: -5, productViews: 23, addToCart: 32, checkout: -11 },
    };
    return changes[selectedPeriod][metric as keyof (typeof changes)[typeof selectedPeriod]] || 0;
  };

  return (
    <div className="min-h-screen flex items-center justify-center p-6 lg:p-8">
      <Card className="w-full max-w-5xl">
        <CardHeader className="border-0 min-h-auto py-6">
          <CardTitle className="text-lg font-semibold">Conversion Funnel</CardTitle>
          <CardToolbar>
            {/* Period Selector */}
            <Select value={selectedPeriod} onValueChange={(value) => setSelectedPeriod(value as PeriodKey)}>
              <SelectTrigger>
                <SelectValue />
              </SelectTrigger>
              <SelectContent align="end">
                {Object.values(PERIODS).map((period) => (
                  <SelectItem key={period.key} value={period.key}>
                    {period.label}
                  </SelectItem>
                ))}
              </SelectContent>
            </Select>
          </CardToolbar>
        </CardHeader>

        <CardContent className="px-2.5">
          {/* Stats Section */}
          <div className="@container px-2.5">
            <div className="grid @3xl:grid-cols-2 @4xl:grid-cols-4 gap-6 mb-10">
              {stageMetrics.map((stage) => {
                const value = latestData[stage.key as keyof typeof latestData] as number;
                const change = getChangeForMetric(stage.key);

                return (
                  <div key={stage.key} className="space-y-1">
                    <div className="flex items-center gap-2.5">
                      <div className="w-0.5 h-12 rounded-full bg-border"></div>
                      <div className="flex flex-col gap-2">
                        <div className="text-sm font-medium text-muted-foreground">{stage.label}</div>
                        <div className="flex items-center gap-2.5">
                          <span className="text-2xl font-semibold leading-none">{value.toLocaleString()}</span>
                          <span
                            className={cn(
                              'inline-flex items-center gap-1 text-xs font-medium',
                              change >= 0 ? 'text-green-500' : 'text-destructive',
                            )}
                          >
                            {change >= 0 ? <TrendingUp className="size-4" /> : <TrendingDown className="size-4" />}{' '}
                            {/* TODO: Add icon */}
                            {Math.abs(change)}%
                          </span>
                        </div>
                      </div>
                    </div>
                  </div>
                );
              })}
            </div>
          </div>

          {/* Chart */}
          <ChartContainer
            config={chartConfig}
            className="h-[400px] w-full [&_.recharts-curve.recharts-tooltip-cursor]:stroke-initial"
          >
            <AreaChart
              accessibilityLayer
              data={currentData}
              margin={{
                top: 10,
                bottom: 10,
                left: 20,
                right: 20,
              }}
            >
              {/* Background pattern for chart area only */}
              <defs>
                {/* Modern Abstract Background Pattern */}
                <pattern id="modernPattern" x="0" y="0" width="32" height="32" patternUnits="userSpaceOnUse">
                  {/* Diagonal grid lines */}
                  <path
                    d="M0,16 L32,16 M16,0 L16,32"
                    stroke="var(--muted-foreground)"
                    strokeWidth="0.5"
                    strokeOpacity="0.03"
                  />
                  <path
                    d="M0,0 L32,32 M0,32 L32,0"
                    stroke="var(--muted-foreground)"
                    strokeWidth="0.3"
                    strokeOpacity="0.02"
                  />

                  {/* Modern geometric elements */}
                  <circle cx="8" cy="8" r="1.5" fill="var(--muted-foreground)" fillOpacity="0.04" />
                  <circle cx="24" cy="24" r="1.5" fill="var(--muted-foreground)" fillOpacity="0.04" />

                  {/* Abstract rounded rectangles */}
                  <rect x="12" y="4" width="8" height="2" rx="1" fill="var(--muted-foreground)" fillOpacity="0.02" />
                  <rect x="4" y="26" width="8" height="2" rx="1" fill="var(--muted-foreground)" fillOpacity="0.02" />
                  <rect x="20" y="12" width="2" height="8" rx="1" fill="var(--muted-foreground)" fillOpacity="0.02" />

                  {/* Minimal dots */}
                  <circle cx="6" cy="20" r="0.5" fill="var(--muted-foreground)" fillOpacity="0.06" />
                  <circle cx="26" cy="10" r="0.5" fill="var(--muted-foreground)" fillOpacity="0.06" />
                  <circle cx="14" cy="28" r="0.5" fill="var(--muted-foreground)" fillOpacity="0.06" />
                </pattern>

                <linearGradient id="fillStoreVisits" x1="0" y1="0" x2="0" y2="1">
                  <stop offset="5%" stopColor="var(--color-storeVisits)" stopOpacity={0.8} />
                  <stop offset="95%" stopColor="var(--color-storeVisits)" stopOpacity={0.1} />
                </linearGradient>
                <linearGradient id="fillProductViews" x1="0" y1="0" x2="0" y2="1">
                  <stop offset="5%" stopColor="var(--color-productViews)" stopOpacity={0.8} />
                  <stop offset="95%" stopColor="var(--color-productViews)" stopOpacity={0.1} />
                </linearGradient>
                <linearGradient id="fillAddToCart" x1="0" y1="0" x2="0" y2="1">
                  <stop offset="5%" stopColor="var(--color-addToCart)" stopOpacity={0.8} />
                  <stop offset="95%" stopColor="var(--color-addToCart)" stopOpacity={0.1} />
                </linearGradient>
                <linearGradient id="fillCheckout" x1="0" y1="0" x2="0" y2="1">
                  <stop offset="5%" stopColor="var(--color-checkout)" stopOpacity={0.8} />
                  <stop offset="95%" stopColor="var(--color-checkout)" stopOpacity={0.1} />
                </linearGradient>
              </defs>

              <CartesianGrid vertical={false} />

              <XAxis
                dataKey="period"
                tickLine={false}
                axisLine={false}
                tickMargin={10}
                tick={{ textAnchor: 'middle', fontSize: 12 }}
                interval={0}
              />

              <YAxis hide />

              <ChartTooltip
                cursor={{
                  strokeDasharray: '4 4',
                  stroke: 'oklch(45.7% 0.24 277.023)',
                  strokeWidth: 1,
                  strokeOpacity: 0.6,
                }}
                content={<CustomTooltip />}
                offset={20}
                position={{ x: undefined, y: undefined }}
              />

              {/* Background Pattern Areas */}
              <Area
                dataKey="storeVisits"
                type="natural"
                fill="url(#modernPattern)"
                fillOpacity={1}
                stroke="transparent"
                stackId="pattern"
                dot={false}
                activeDot={false}
              />
              <Area
                dataKey="productViews"
                type="natural"
                fill="url(#modernPattern)"
                fillOpacity={1}
                stroke="transparent"
                stackId="pattern"
                dot={false}
                activeDot={false}
              />
              <Area
                dataKey="addToCart"
                type="natural"
                fill="url(#modernPattern)"
                fillOpacity={1}
                stroke="transparent"
                stackId="pattern"
                dot={false}
                activeDot={false}
              />
              <Area
                dataKey="checkout"
                type="natural"
                fill="url(#modernPattern)"
                fillOpacity={1}
                stroke="transparent"
                stackId="pattern"
                dot={false}
                activeDot={false}
              />

              {/* Stacked Areas */}
              <Area
                dataKey="checkout"
                type="natural"
                fill="url(#fillCheckout)"
                fillOpacity={0.5}
                stroke="var(--color-checkout)"
                stackId="a"
                dot={false}
                activeDot={{
                  r: 4,
                  fill: 'var(--color-checkout)',
                  stroke: 'white',
                  strokeWidth: 1.5,
                }}
              />
              <Area
                dataKey="addToCart"
                type="natural"
                fill="url(#fillAddToCart)"
                fillOpacity={0.4}
                stroke="var(--color-addToCart)"
                stackId="a"
                dot={false}
                activeDot={{
                  r: 4,
                  fill: 'var(--color-addToCart)',
                  stroke: 'white',
                  strokeWidth: 1.5,
                }}
              />
              <Area
                dataKey="productViews"
                type="natural"
                fill="url(#fillProductViews)"
                fillOpacity={0.3}
                stroke="var(--color-productViews)"
                stackId="a"
                dot={false}
                activeDot={{
                  r: 4,
                  fill: 'var(--color-productViews)',
                  stroke: 'white',
                  strokeWidth: 1.5,
                }}
              />
              <Area
                dataKey="storeVisits"
                type="natural"
                fill="url(#fillStoreVisits)"
                fillOpacity={0.2}
                stroke="var(--color-storeVisits)"
                stackId="a"
                dot={false}
                activeDot={{
                  r: 4,
                  fill: 'var(--color-storeVisits)',
                  stroke: 'white',
                  strokeWidth: 1.5,
                }}
              />
            </AreaChart>
          </ChartContainer>
        </CardContent>
      </Card>
    </div>
  );
}