"use client"

import { useState, useEffect, Suspense } from 'react';
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
import { 
  TrendingUp, 
  ShoppingCart, 
  Users, 
  Package, 
  DollarSign, 
  BarChart3,
  PieChart,
  Activity,
  RefreshCw,
  Eye,
  EyeOff,
  Calculator
} from "lucide-react";
import { useToast } from "@/hooks/use-toast";
import MetricsCard from "./MetricsCard";
import { getAnalyticsOverviewWithStore, type AnalyticsOverview } from "@/lib/services/analytics-service";
import { formatGBP } from "@/utils/format";
import { MetricsCardSkeleton } from './SkeletonLoaders';
import dynamic from 'next/dynamic';
import { Skeleton } from "@/components/ui/skeleton";
import { DateRangePicker } from "@/components/ui/date-picker";
import { DateRange } from "react-day-picker";
import { addDays, startOfDay, endOfDay } from "date-fns";
import type { DateRange as ProfitDateRange } from "@/lib/services/profit-analytics-service";

// Lazy load chart components
const RevenueChart = dynamic(() => import('./RevenueChart'), {
  loading: () => <ChartSkeleton />
});

const ProductPerformanceChart = dynamic(() => import('./ProductPerformanceChart'), {
  loading: () => <ChartSkeleton />
});

const CustomerInsightsChart = dynamic(() => import('./CustomerInsightsChart'), {
  loading: () => <ChartSkeleton />
});

const OrderAnalyticsChart = dynamic(() => import('./OrderAnalyticsChart'), {
  loading: () => <ChartSkeleton />
});

const ProfitAnalyticsChart = dynamic(() => import('./ProfitAnalyticsChart'), {
  loading: () => <ChartSkeleton />
});

// Chart loading skeleton
function ChartSkeleton() {
  return (
    <Card>
      <CardHeader>
        <Skeleton className="h-6 w-48" />
        <Skeleton className="h-4 w-72" />
      </CardHeader>
      <CardContent>
        <div className="h-80 w-full flex items-center justify-center">
          <div className="flex flex-col items-center gap-2">
            <BarChart3 className="h-8 w-8 text-muted-foreground animate-pulse" />
            <Skeleton className="h-4 w-32" />
          </div>
        </div>
      </CardContent>
    </Card>
  );
}

interface AnalyticsDashboardProps {
  initialData: AnalyticsOverview;
}

export default function AnalyticsDashboard({ initialData }: AnalyticsDashboardProps) {
  const [data, setData] = useState<AnalyticsOverview>(initialData);
  const [isLoading, setIsLoading] = useState(false);
  const [timeRange, setTimeRange] = useState('30');
  const [hideNumbers, setHideNumbers] = useState(false);
  const [profitDateRange, setProfitDateRange] = useState<DateRange | undefined>({
    from: startOfDay(addDays(new Date(), -29)),
    to: endOfDay(new Date())
  });
  const { toast } = useToast();

  // 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 maintaining similar length
    if (value.match(/^\d/)) {
      const numLength = value.replace(/[,\.]/g, '').length;
      return '*'.repeat(Math.min(numLength, 4));
    }
    
    return value;
  };

  const refreshData = async () => {
    try {
      setIsLoading(true);
      const newData = await getAnalyticsOverviewWithStore();
      setData(newData);
      toast({
        title: "Data refreshed",
        description: "Analytics data has been updated successfully.",
      });
    } catch (error) {
      toast({
        title: "Error",
        description: "Failed to refresh analytics data.",
        variant: "destructive",
      });
    } finally {
      setIsLoading(false);
    }
  };

  const metrics = [
    {
      title: "Total Revenue",
      value: maskValue(formatGBP(data.revenue.total)),
      description: "All-time revenue",
      icon: DollarSign,
      trend: data.revenue.monthly > 0 ? "up" as const : "neutral" as const,
      trendValue: hideNumbers ? "Hidden" : `${formatGBP(data.revenue.monthly)} this month`
    },
    {
      title: "Total Orders",
      value: maskValue(data.orders.total.toLocaleString()),
      description: "All-time orders",
      icon: ShoppingCart,
      trend: data.orders.completed > 0 ? "up" as const : "neutral" as const,
      trendValue: hideNumbers ? "Hidden" : `${data.orders.completed} completed`
    },
    {
      title: "Unique Customers",
      value: maskValue(data.customers.unique.toLocaleString()),
      description: "Total customers",
      icon: Users,
      trend: "neutral" as const,
      trendValue: "Lifetime customers"
    },
    {
      title: "Products",
      value: maskValue(data.products.total.toLocaleString()),
      description: "Active products",
      icon: Package,
      trend: "neutral" as const,
      trendValue: "In your store"
    }
  ];

  return (
    <div className="space-y-6">
      {/* Header with Privacy Toggle */}
      <div className="flex items-center justify-between">
        <div>
          <h2 className="text-3xl font-bold tracking-tight">Analytics Dashboard</h2>
          <p className="text-muted-foreground">
            Overview of your store's performance and metrics.
          </p>
        </div>
        <div className="flex items-center gap-2">
          <Button
            variant="outline"
            size="sm"
            onClick={() => setHideNumbers(!hideNumbers)}
            className="flex items-center gap-2"
          >
            {hideNumbers ? (
              <>
                <EyeOff className="h-4 w-4" />
                Show Numbers
              </>
            ) : (
              <>
                <Eye className="h-4 w-4" />
                Hide Numbers
              </>
            )}
          </Button>
          <Button
            variant="outline"
            size="sm"
            onClick={refreshData}
            disabled={isLoading}
            className="flex items-center gap-2"
          >
            <RefreshCw className={`h-4 w-4 ${isLoading ? 'animate-spin' : ''}`} />
            Refresh
          </Button>
        </div>
      </div>

      {/* Key Metrics Cards */}
      <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4 gap-4 lg:gap-6">
        {isLoading ? (
          [...Array(4)].map((_, i) => (
            <MetricsCardSkeleton key={i} />
          ))
        ) : (
          metrics.map((metric) => (
            <MetricsCard key={metric.title} {...metric} />
          ))
        )}
      </div>

      {/* Completion Rate Card */}
      <Card>
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <Activity className="h-5 w-5" />
            Order Completion Rate
          </CardTitle>
          <CardDescription>
            Percentage of orders that have been successfully completed
          </CardDescription>
        </CardHeader>
        <CardContent>
          {isLoading ? (
            <div className="flex items-center gap-4">
              <div className="h-12 w-16 bg-muted/20 rounded animate-pulse" />
              <div className="flex-1">
                <div className="w-full bg-muted/20 rounded-full h-2 animate-pulse" />
              </div>
              <div className="h-6 w-16 bg-muted/20 rounded animate-pulse" />
            </div>
          ) : (
            <div className="flex items-center gap-4">
              <div className="text-3xl font-bold">
                {hideNumbers ? "**%" : `${data.orders.completionRate}%`}
              </div>
              <div className="flex-1">
                <div className="w-full bg-secondary rounded-full h-2">
                  <div 
                    className="bg-primary h-2 rounded-full transition-all duration-300"
                    style={{ width: hideNumbers ? "0%" : `${data.orders.completionRate}%` }}
                  />
                </div>
              </div>
              <Badge variant="secondary">
                {hideNumbers ? "** / **" : `${data.orders.completed} / ${data.orders.total}`}
              </Badge>
            </div>
          )}
        </CardContent>
      </Card>

      {/* Time Period Selector */}
      <div className="flex flex-col sm:flex-row gap-4 sm:items-center sm:justify-between">
        <div>
          <h3 className="text-lg font-semibold">Time Period</h3>
          <p className="text-sm text-muted-foreground">
            Revenue, Profit, and Orders tabs use time filtering. Products and Customers show all-time data.
          </p>
        </div>
        <Select value={timeRange} onValueChange={setTimeRange}>
          <SelectTrigger className="w-32">
            <SelectValue />
          </SelectTrigger>
          <SelectContent>
            <SelectItem value="7">Last 7 days</SelectItem>
            <SelectItem value="30">Last 30 days</SelectItem>
            <SelectItem value="90">Last 90 days</SelectItem>
          </SelectContent>
        </Select>
      </div>

      {/* Analytics Tabs */}
      <div className="space-y-6">
        <Tabs defaultValue="revenue" className="space-y-6">
          <TabsList className="grid w-full grid-cols-2 sm:grid-cols-3 lg:grid-cols-5">
            <TabsTrigger value="revenue" className="flex items-center gap-2">
              <TrendingUp className="h-4 w-4" />
              Revenue
            </TabsTrigger>
            <TabsTrigger value="profit" className="flex items-center gap-2">
              <Calculator className="h-4 w-4" />
              Profit
            </TabsTrigger>
            <TabsTrigger value="products" className="flex items-center gap-2">
              <Package className="h-4 w-4" />
              Products
            </TabsTrigger>
            <TabsTrigger value="customers" className="flex items-center gap-2">
              <Users className="h-4 w-4" />
              Customers
            </TabsTrigger>
            <TabsTrigger value="orders" className="flex items-center gap-2">
              <BarChart3 className="h-4 w-4" />
              Orders
            </TabsTrigger>
          </TabsList>

          <TabsContent value="revenue" className="space-y-6">
            <Suspense fallback={<ChartSkeleton />}>
              <RevenueChart timeRange={timeRange} hideNumbers={hideNumbers} />
            </Suspense>
          </TabsContent>

          <TabsContent value="profit" className="space-y-6">
            {/* Date Range Selector for Profit Calculator */}
            <Card>
              <CardHeader>
                <CardTitle className="text-lg">Date Range</CardTitle>
                <CardDescription>
                  Select a custom date range for profit calculations
                </CardDescription>
              </CardHeader>
              <CardContent>
                <div className="flex flex-col sm:flex-row gap-4 sm:items-center">
                  <DateRangePicker
                    dateRange={profitDateRange}
                    onDateRangeChange={setProfitDateRange}
                    placeholder="Select date range"
                    showPresets={true}
                    className="w-full sm:w-auto"
                  />
                  {profitDateRange?.from && profitDateRange?.to && (
                    <div className="text-sm text-muted-foreground flex items-center">
                      <span>
                        {profitDateRange.from.toLocaleDateString()} - {profitDateRange.to.toLocaleDateString()}
                      </span>
                    </div>
                  )}
                </div>
              </CardContent>
            </Card>
            <Suspense fallback={<ChartSkeleton />}>
              <ProfitAnalyticsChart 
                dateRange={profitDateRange?.from && profitDateRange?.to ? {
                  from: profitDateRange.from,
                  to: profitDateRange.to
                } : undefined}
                hideNumbers={hideNumbers} 
              />
            </Suspense>
          </TabsContent>

          <TabsContent value="products" className="space-y-6">
            <Suspense fallback={<ChartSkeleton />}>
              <ProductPerformanceChart />
            </Suspense>
          </TabsContent>

          <TabsContent value="customers" className="space-y-6">
            <Suspense fallback={<ChartSkeleton />}>
              <CustomerInsightsChart />
            </Suspense>
          </TabsContent>

          <TabsContent value="orders" className="space-y-6">
            <Suspense fallback={<ChartSkeleton />}>
              <OrderAnalyticsChart timeRange={timeRange} />
            </Suspense>
          </TabsContent>
        </Tabs>
      </div>
    </div>
  );
}