"use client"

import { useState, useEffect } from 'react';
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import { useToast } from "@/hooks/use-toast";
import { Skeleton } from "@/components/ui/skeleton";
import { TrendingUp, DollarSign } from "lucide-react";
import { getRevenueTrendsWithStore, type RevenueData } from "@/lib/services/analytics-service";
import { formatGBP } from "@/utils/format";
import { LineChart, Line, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer, BarChart, Bar } from 'recharts';
import { ChartSkeleton } from './SkeletonLoaders';

interface RevenueChartProps {
  timeRange: string;
  hideNumbers?: boolean;
}

interface ChartDataPoint {
  date: string;
  revenue: number;
  orders: number;
  formattedDate: string;
}

export default function RevenueChart({ timeRange, hideNumbers = false }: RevenueChartProps) {
  const [data, setData] = useState<RevenueData[]>([]);
  const [isLoading, setIsLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const { toast } = useToast();

  useEffect(() => {
    const fetchRevenueData = async () => {
      try {
        setIsLoading(true);
        setError(null);
        const response = await getRevenueTrendsWithStore(timeRange);
        console.log('Revenue trends response:', response);
        setData(Array.isArray(response) ? response : []);
      } catch (err) {
        console.error('Error fetching revenue data:', err);
        setError('Failed to load revenue data');
        setData([]);
        toast({
          title: "Error",
          description: "Failed to load revenue trends data.",
          variant: "destructive",
        });
      } finally {
        setIsLoading(false);
      }
    };

    fetchRevenueData();
  }, [timeRange, toast]);

  // Transform data for Recharts
  const chartData: ChartDataPoint[] = data.map(item => {
    // Use UTC to avoid timezone issues
    const date = new Date(Date.UTC(item._id.year, item._id.month - 1, item._id.day));
    return {
      date: date.toISOString().split('T')[0], // YYYY-MM-DD format
      revenue: item.revenue || 0,
      orders: item.orders || 0,
      formattedDate: date.toLocaleDateString('en-GB', { 
        weekday: 'short',
        month: 'short', 
        day: 'numeric',
        timeZone: 'UTC'
      })
    };
  });

  // Calculate summary stats
  const safeData = Array.isArray(data) ? data : [];
  const totalRevenue = safeData.reduce((sum, item) => sum + (item.revenue || 0), 0);
  const totalOrders = safeData.reduce((sum, item) => sum + (item.orders || 0), 0);
  const averageRevenue = safeData.length > 0 ? totalRevenue / safeData.length : 0;

  // Function to mask sensitive numbers
  const maskValue = (value: string): string => {
    if (!hideNumbers) return value;
    
    // For currency values (£X.XX), show £***
    if (value.includes('£')) {
      return '£***';
    }
    
    // For regular numbers, replace with asterisks
    return '***';
  };

  // Custom tooltip for the chart
  const CustomTooltip = ({ active, payload, label }: any) => {
    if (active && payload && payload.length) {
      const data = payload[0].payload;
      return (
        <div className="bg-white p-3 border border-gray-200 rounded-lg shadow-lg">
          <p className="text-sm font-medium text-gray-900">{data.formattedDate}</p>
          <p className="text-sm text-blue-600">
            Revenue: <span className="font-semibold">{hideNumbers ? '£***' : formatGBP(data.revenue)}</span>
          </p>
          <p className="text-sm text-green-600">
            Orders: <span className="font-semibold">{hideNumbers ? '***' : data.orders}</span>
          </p>
        </div>
      );
    }
    return null;
  };

  if (isLoading) {
    return (
      <ChartSkeleton 
        title="Revenue Trends"
        description="Revenue performance over the selected time period"
        icon={TrendingUp}
        showStats={true}
      />
    );
  }

  if (error) {
    return (
      <Card>
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <TrendingUp className="h-5 w-5" />
            Revenue Trends
          </CardTitle>
        </CardHeader>
        <CardContent>
          <div className="text-center py-8">
            <DollarSign className="h-12 w-12 mx-auto text-muted-foreground mb-4" />
            <p className="text-muted-foreground">Failed to load revenue data</p>
          </div>
        </CardContent>
      </Card>
    );
  }

  if (chartData.length === 0) {
    return (
      <Card>
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <TrendingUp className="h-5 w-5" />
            Revenue Trends
          </CardTitle>
          <CardDescription>
            Revenue performance over the selected time period
          </CardDescription>
        </CardHeader>
        <CardContent>
          <div className="text-center py-8">
            <DollarSign className="h-12 w-12 mx-auto text-muted-foreground mb-4" />
            <p className="text-muted-foreground">No revenue data available for this period</p>
          </div>
        </CardContent>
      </Card>
    );
  }

  return (
    <Card>
      <CardHeader>
        <CardTitle className="flex items-center gap-2">
          <TrendingUp className="h-5 w-5" />
          Revenue Trends
        </CardTitle>
        <CardDescription>
          Revenue performance over the selected time period
        </CardDescription>
      </CardHeader>
      <CardContent>
        <div className="space-y-6">
          {/* Chart */}
          <div className="h-64">
            <ResponsiveContainer width="100%" height="100%">
              <BarChart data={chartData} margin={{ top: 5, right: 30, left: 20, bottom: 5 }}>
                <CartesianGrid strokeDasharray="3 3" />
                <XAxis 
                  dataKey="formattedDate" 
                  tick={{ fontSize: 12 }}
                  angle={-45}
                  textAnchor="end"
                  height={60}
                />
                <YAxis 
                  tick={{ fontSize: 12 }}
                  tickFormatter={(value) => hideNumbers ? '***' : `£${(value / 1000).toFixed(0)}k`}
                />
                <Tooltip content={<CustomTooltip />} />
                <Bar 
                  dataKey="revenue" 
                  fill="#2563eb" 
                  stroke="#1d4ed8"
                  strokeWidth={1}
                  radius={[2, 2, 0, 0]}
                />
              </BarChart>
            </ResponsiveContainer>
          </div>
          
          {/* Summary stats */}
          <div className="grid grid-cols-3 gap-4 pt-4 border-t">
            <div className="text-center">
              <div className="text-2xl font-bold text-green-600">
                {maskValue(formatGBP(totalRevenue))}
              </div>
              <div className="text-sm text-muted-foreground">Total Revenue</div>
            </div>
            <div className="text-center">
              <div className="text-2xl font-bold text-blue-600">
                {maskValue(totalOrders.toString())}
              </div>
              <div className="text-sm text-muted-foreground">Total Orders</div>
            </div>
            <div className="text-center">
              <div className="text-2xl font-bold text-purple-600">
                {maskValue(formatGBP(averageRevenue))}
              </div>
              <div className="text-sm text-muted-foreground">Avg Daily Revenue</div>
            </div>
          </div>
        </div>
      </CardContent>
    </Card>
  );
}