"use client"

import { useState, useEffect } from "react"
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card"
import { Button } from "@/components/ui/button"
import { Skeleton } from "@/components/ui/skeleton"
import { TrendingUp, DollarSign, RefreshCcw } from "lucide-react"
import { AreaChart, Area, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer } from "recharts"
import { getRevenueTrendsWithStore, type RevenueData, formatGBP } from "@/lib/api"
import { useToast } from "@/components/ui/use-toast"

interface RevenueWidgetProps {
    settings?: {
        days?: number
        showComparison?: boolean
    }
}

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

export default function RevenueWidget({ settings }: RevenueWidgetProps) {
    const days = settings?.days || 7
    const [data, setData] = useState<RevenueData[]>([])
    const [isLoading, setIsLoading] = useState(true)
    const [error, setError] = useState<string | null>(null)
    const { toast } = useToast()

    const fetchRevenueData = async () => {
        try {
            setIsLoading(true)
            setError(null)
            const response = await getRevenueTrendsWithStore(days.toString())
            setData(Array.isArray(response) ? response : [])
        } catch (err) {
            console.error("Error fetching revenue data:", err)
            setError("Failed to load revenue data")
        } finally {
            setIsLoading(false)
        }
    }

    useEffect(() => {
        fetchRevenueData()
    }, [days])

    const chartData: ChartDataPoint[] = data.map(item => {
        const date = new Date(Date.UTC(item._id.year, item._id.month - 1, item._id.day))
        return {
            date: date.toISOString().split('T')[0],
            revenue: item.revenue || 0,
            orders: item.orders || 0,
            formattedDate: date.toLocaleDateString('en-GB', {
                month: 'short',
                day: 'numeric',
                timeZone: 'UTC'
            })
        }
    })

    // Summary stats
    const totalRevenue = data.reduce((sum, item) => sum + (item.revenue || 0), 0)
    const totalOrders = data.reduce((sum, item) => sum + (item.orders || 0), 0)

    const CustomTooltip = ({ active, payload }: any) => {
        if (active && payload && payload.length) {
            const data = payload[0].payload
            return (
                <div className="bg-background/95 backdrop-blur-md p-3 border border-border shadow-xl rounded-xl">
                    <p className="text-xs font-semibold text-muted-foreground uppercase tracking-wider mb-1">{data.formattedDate}</p>
                    <div className="space-y-1">
                        <p className="text-sm font-bold text-primary">
                            Revenue: {formatGBP(data.revenue)}
                        </p>
                        <p className="text-xs text-muted-foreground">
                            Orders: <span className="font-medium text-foreground">{data.orders}</span>
                        </p>
                    </div>
                </div>
            )
        }
        return null
    }

    if (isLoading) {
        return (
            <Card className="border-border/40 bg-background/50 backdrop-blur-sm">
                <CardHeader className="pb-2">
                    <Skeleton className="h-5 w-32 mb-1" />
                    <Skeleton className="h-4 w-48" />
                </CardHeader>
                <CardContent>
                    <Skeleton className="h-[250px] w-full rounded-xl" />
                </CardContent>
            </Card>
        )
    }

    return (
        <Card className="border-border/40 bg-background/50 backdrop-blur-sm overflow-hidden flex flex-col h-full">
            <CardHeader className="flex flex-row items-center justify-between pb-2">
                <div className="space-y-1">
                    <CardTitle className="flex items-center gap-2">
                        <TrendingUp className="h-5 w-5 text-primary" />
                        Revenue Insights
                    </CardTitle>
                    <CardDescription>
                        Performance over the last {days} days
                    </CardDescription>
                </div>
                {error && (
                    <Button variant="ghost" size="icon" onClick={fetchRevenueData} className="h-8 w-8">
                        <RefreshCcw className="h-4 w-4" />
                    </Button>
                )}
            </CardHeader>
            <CardContent className="flex-grow pt-4">
                {error ? (
                    <div className="h-[300px] flex flex-col items-center justify-center text-center p-6">
                        <DollarSign className="h-12 w-12 text-muted-foreground/20 mb-4" />
                        <p className="text-sm text-muted-foreground mb-4">Could not load revenue trends</p>
                        <Button variant="outline" size="sm" onClick={fetchRevenueData}>Retry</Button>
                    </div>
                ) : chartData.length === 0 ? (
                    <div className="h-[300px] flex flex-col items-center justify-center text-center p-6">
                        <DollarSign className="h-12 w-12 text-muted-foreground/20 mb-4" />
                        <h3 className="text-lg font-medium">No revenue data</h3>
                        <p className="text-sm text-muted-foreground max-w-xs mt-2">
                            Start making sales to see your revenue trends here.
                        </p>
                    </div>
                ) : (
                    <div className="space-y-6">
                        <div className="h-[300px] w-full">
                            <ResponsiveContainer width="100%" height="100%">
                                <AreaChart data={chartData} margin={{ top: 0, right: 0, left: -20, bottom: 0 }}>
                                    <defs>
                                        <linearGradient id="colorRevenueWidget" x1="0" y1="0" x2="0" y2="1">
                                            <stop offset="5%" stopColor="hsl(var(--primary))" stopOpacity={0.3} />
                                            <stop offset="95%" stopColor="hsl(var(--primary))" stopOpacity={0} />
                                        </linearGradient>
                                    </defs>
                                    <CartesianGrid strokeDasharray="3 3" vertical={false} stroke="hsl(var(--border))" opacity={0.5} />
                                    <XAxis
                                        dataKey="formattedDate"
                                        tick={{ fontSize: 11, fill: "hsl(var(--muted-foreground))" }}
                                        axisLine={false}
                                        tickLine={false}
                                        minTickGap={30}
                                    />
                                    <YAxis
                                        tick={{ fontSize: 11, fill: "hsl(var(--muted-foreground))" }}
                                        axisLine={false}
                                        tickLine={false}
                                        tickFormatter={(value) => `£${value >= 1000 ? (value / 1000).toFixed(1) + 'k' : value}`}
                                    />
                                    <Tooltip content={<CustomTooltip />} />
                                    <Area
                                        type="monotone"
                                        dataKey="revenue"
                                        stroke="hsl(var(--primary))"
                                        fillOpacity={1}
                                        fill="url(#colorRevenueWidget)"
                                        strokeWidth={2.5}
                                        activeDot={{ r: 6, strokeWidth: 0, fill: "hsl(var(--primary))" }}
                                    />
                                </AreaChart>
                            </ResponsiveContainer>
                        </div>

                        <div className="grid grid-cols-2 gap-4 pb-2">
                            <div className="p-4 rounded-2xl bg-primary/5 border border-primary/10">
                                <div className="text-sm text-muted-foreground font-medium mb-1">Total Revenue</div>
                                <div className="text-2xl font-bold text-primary">{formatGBP(totalRevenue)}</div>
                            </div>
                            <div className="p-4 rounded-2xl bg-muted/50 border border-border">
                                <div className="text-sm text-muted-foreground font-medium mb-1">Total Orders</div>
                                <div className="text-2xl font-bold">{totalOrders}</div>
                            </div>
                        </div>
                    </div>
                )}
            </CardContent>
        </Card>
    )
}