'use client';

import React, { useState } from 'react';
import { TrendingDown, TrendingUp } from 'lucide-react';
import {
  CartesianGrid,
  ComposedChart,
  Line,
  ResponsiveContainer,
  Tooltip,
  XAxis,
  YAxis,
} from 'recharts';
import { Badge } from '@/components/ui/badge';
import {
  Card,
  CardContent,
  CardHeader,
  CardTitle,
  CardToolbar,
} from '@/components/ui/card';
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@/components/ui/select';

// E-commerce data for different periods with balanced patterns
const salesViewsData = {
  '7d': [
    { period: 'Aug 1', sales: 850, views: 620 },
    { period: 'Aug 5', sales: 920, views: 780 },
    { period: 'Aug 7', sales: 780, views: 540 },
    { period: 'Aug 8', sales: 1240, views: 890 },
    { period: 'Aug 22', sales: 1100, views: 720 },
  ],

  '30d': [
    { period: 'Week 1', sales: 5200, views: 4800 },
    { period: 'Week 2', sales: 6400, views: 5200 },
    { period: 'Week 3', sales: 5800, views: 4600 },
    { period: 'Week 4', sales: 7200, views: 5800 },
    { period: 'Week 5', sales: 6800, views: 5400 },
    { period: 'Week 6', sales: 6200, views: 4900 },
  ],

  '90d': [
    { period: 'Jan', sales: 22000, views: 18500 },
    { period: 'Feb', sales: 24800, views: 20200 },
    { period: 'Mar', sales: 21400, views: 17800 },
    { period: 'Apr', sales: 26200, views: 21600 },
    { period: 'May', sales: 25600, views: 20800 },
    { period: 'Jun', sales: 27400, views: 22400 },
    { period: 'Jul', sales: 24800, views: 19600 },
    { period: 'Aug', sales: 23600, views: 18800 },
    { period: 'Sep', sales: 28200, views: 23200 },
  ],

  '12m': [
    { period: 'Q1 23', sales: 85000, views: 72000 },
    { period: 'Q2 23', sales: 92000, views: 78000 },
    { period: 'Q3 23', sales: 88000, views: 74000 },
    { period: 'Q4 23', sales: 98000, views: 82000 },
    { period: 'Q1 24', sales: 94000, views: 79000 },
    { period: 'Q2 24', sales: 102000, views: 86000 },
    { period: 'Q3 24', sales: 96000, views: 81000 },
    { period: 'Q4 24', sales: 108000, views: 90000 },
  ],
};

// 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' },
};

// Custom Tooltip

const ChartLabel = ({ label, color }) => {
  return (
    <div className="flex items-center gap-1.5">
      <div
        className="w-1 h-3 rounded-full"
        style={{ backgroundColor: color }}
      ></div>
      <span className="text-muted-foreground">{label}</span>
    </div>
  );
};

const CustomTooltip = ({ active, payload, label }) => {
  if (active && payload && payload.length) {
    return (
      <div className="rounded-lg border bg-background p-3 shadow-sm shadow-black/5 min-w-[150px]">
        <div className="text-xs font-medium text-muted-foreground tracking-wide mb-2.5">
          {label}
        </div>
        <div className="space-y-2">
          {payload.map((entry, index) => {
            const label = entry.dataKey === 'sales' ? 'Sales' : 'Views';
            return (
              <div key={index} className="flex items-center gap-2 text-xs">
                <ChartLabel label={label + ':'} color={entry.color} />
                <span className="font-semibold text-foreground">
                  {entry.dataKey === 'sales'
                    ? `$${entry.value.toLocaleString()}`
                    : entry.value >= 0
                      ? `+${entry.value.toLocaleString()}`
                      : entry.value.toLocaleString()}
                </span>
              </div>
            );
          })}
        </div>
      </div>
    );
  }
  return null;
};

export function ProductStock() {
  const [selectedPeriod, setSelectedPeriod] = useState('30d');

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

  // Calculate totals and percentages
  const totalSales = currentData.reduce((sum, item) => sum + item.sales, 0);
  const totalViews = currentData.reduce((sum, item) => sum + item.views, 0);
  // Calculate percentage changes (simulated)
  const salesChange =
    selectedPeriod === '7d'
      ? 12
      : selectedPeriod === '30d'
        ? 8
        : selectedPeriod === '90d'
          ? -3
          : 15;
  const viewsChange =
    selectedPeriod === '7d'
      ? -3
      : selectedPeriod === '30d'
        ? 5
        : selectedPeriod === '90d'
          ? -8
          : 12;

  return (
    <Card className="h-full">
      <CardHeader>
        <CardTitle>Sales Activity</CardTitle>

        <CardToolbar>
          {/* Period Selector */}
          <Select
            value={selectedPeriod}
            onValueChange={(value) => setSelectedPeriod(value)}
          >
            <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 py-6">
        {/* Stats Section */}
        <div className="flex items-center flex-wrap gap-3.5 md:gap-10 px-5 pt-6 mb-8 text-sm">
          <div className="flex items-center gap-3.5">
            <ChartLabel label="Sales" color="#f59e0b" />
            <div className="flex items-center gap-2">
              <span className="text-2xl font-bold">
                ${totalSales.toLocaleString()}
              </span>
              <Badge
                variant={salesChange >= 0 ? 'success' : 'destructive'}
                appearance="light"
              >
                {salesChange >= 0 ? (
                  <TrendingUp className="size-3" />
                ) : (
                  <TrendingDown className="size-3" />
                )}
                {Math.abs(salesChange)}%
              </Badge>
            </div>
          </div>
          <div className="flex items-center gap-3.5">
            <ChartLabel label="Views" color="#8b5cf6" />
            <div className="flex items-center gap-2">
              <span className="text-2xl font-bold">
                {totalViews.toLocaleString()}
              </span>
              <Badge
                variant={viewsChange <= 0 ? 'success' : 'destructive'}
                appearance="light"
              >
                {viewsChange <= 0 ? (
                  <TrendingUp className="size-3" />
                ) : (
                  <TrendingDown className="size-3" />
                )}
                {Math.abs(viewsChange)}%
              </Badge>
            </div>
          </div>
        </div>

        {/* Chart */}
        <div className="h-[250px] w-full">
          <ResponsiveContainer width="100%" height="100%">
            <ComposedChart
              data={currentData}
              margin={{
                top: 30,
                right: 5,
                left: 5,
                bottom: 10,
              }}
            >
              {/* Background pattern for chart area only */}
              <defs>
                <linearGradient id="salesGradient" x1="0" y1="0" x2="0" y2="1">
                  <stop offset="0%" stopColor="#f59e0b" stopOpacity={0.3} />
                  <stop offset="100%" stopColor="#f59e0b" stopOpacity={0.05} />
                </linearGradient>
                <linearGradient id="viewsGradient" x1="0" y1="0" x2="0" y2="1">
                  <stop offset="0%" stopColor="#8b5cf6" stopOpacity={0.3} />
                  <stop offset="100%" stopColor="#8b5cf6" stopOpacity={0.05} />
                </linearGradient>
              </defs>

              <CartesianGrid
                strokeDasharray="4 12"
                stroke="hsl(var(--muted))"
                strokeOpacity={1}
                horizontal={true}
                vertical={false}
              />

              {/* X Axis */}
              <XAxis
                dataKey="period"
                axisLine={false}
                tickLine={false}
                tick={{ fontSize: 11, fill: 'hsl(var(--muted-foreground))' }}
                tickMargin={10}
              />

              {/* Left Y Axis for Sales */}
              <YAxis
                yAxisId="sales"
                orientation="left"
                axisLine={false}
                tickLine={false}
                tick={{ fontSize: 11, fill: 'hsl(var(--muted-foreground))' }}
                tickFormatter={(value) =>
                  selectedPeriod === '7d'
                    ? `$${value}`
                    : `$${(value / 1000).toFixed(0)}k`
                }
                tickMargin={10}
              />

              {/* Right Y Axis for Views */}
              <YAxis
                yAxisId="views"
                orientation="right"
                axisLine={false}
                tickLine={false}
                tick={{ fontSize: 11, fill: 'hsl(var(--muted-foreground))' }}
                tickFormatter={(value) => {
                  if (selectedPeriod === '7d') {
                    return value >= 0 ? `+${value}` : value.toString();
                  }
                  return value >= 0
                    ? `+${(value / 1000).toFixed(0)}k`
                    : `${(value / 1000).toFixed(0)}k`;
                }}
                tickMargin={8}
                domain={['dataMin - 100', 'dataMax + 100']}
              />

              <Tooltip
                content={<CustomTooltip />}
                cursor={{
                  strokeDasharray: '3 3',
                  stroke: 'hsl(var(--muted-foreground))',
                  strokeOpacity: 0.5,
                }}
              />

              {/* Sales Line (Linear) */}
              <Line
                yAxisId="sales"
                type="linear"
                dataKey="sales"
                stroke="#f59e0b"
                strokeWidth={1}
                dot={false}
                activeDot={{
                  r: 5,
                  fill: '#f59e0b',
                  strokeWidth: 0,
                }}
              />

              {/* Views Line (Linear Dashed) */}
              <Line
                yAxisId="views"
                type="linear"
                dataKey="views"
                stroke="#8b5cf6"
                strokeWidth={1}
                strokeDasharray="8 4"
                dot={false}
                activeDot={{
                  r: 5,
                  fill: '#8b5cf6',
                  strokeWidth: 0,
                }}
              />
            </ComposedChart>
          </ResponsiveContainer>
        </div>
      </CardContent>
    </Card>
  );
}