"use client";
import { useEffect, useState } from "react";
import axios from "axios";
import {
    Radar, RadarChart, PolarGrid, PolarAngleAxis, PolarRadiusAxis,
    BarChart, Bar, XAxis, YAxis, Tooltip, CartesianGrid, ResponsiveContainer,
    LineChart, Line, PieChart, Pie, Cell, Legend
} from 'recharts';
import { InfoTooltip } from "@/components/ui/tooltip";

const API_URL = "/api";

const COLORS = ['#10b981', '#f59e0b', '#ef4444', '#3b82f6'];

export function AnalyticsSection({ definitions }: { definitions: any }) {
    const [globalData, setGlobalData] = useState<any>(null);
    const [complexity, setComplexity] = useState<any[]>([]);

    useEffect(() => {
        // Fetch new global analytics
        axios.get(`${API_URL}/analytics/global`).then(res => setGlobalData(res.data)).catch(err => console.error(err));
        // Keep existing complexity data
        axios.get(`${API_URL}/analytics/finish-complexity`).then(res => setComplexity(res.data));
    }, []);

    if (!globalData) return <div className="p-8 text-neutral-500 animate-pulse">Loading Global Insights...</div>;

    const { kpis, distributions, trends, global_waterfall, global_blame } = globalData;

    // Prepare blame data for Pie chart
    const blameData = global_blame ? [
        { name: 'Policy (norms)', value: global_blame.policy_pct, color: '#f59e0b' },
        { name: 'Execution (planner)', value: global_blame.execution_pct, color: '#3b82f6' },
        { name: 'Process (manufacturing)', value: global_blame.process_pct, color: '#ef4444' }
    ] : [];

    return (
        <div className="space-y-8 mb-12">
            {/* 1. Global KPI Cards */}
            <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4">
                <KPICard
                    label="Total Order Qty"
                    value={`${(kpis.total_volume_m / 1000000).toFixed(2)}M`}
                    sub="Meters Processed"
                    tooltip="Sum of all DORQT1 (Order Quantity) across every Sale Order line. Formula: Σ Order Qty (meters)."
                />
                <KPICard
                    label="Global Processing Efficiency"
                    value={`${kpis.global_yield_pct}%`}
                    sub="Weighted Average"
                    color={kpis.global_yield_pct > 95 ? "text-emerald-400" : "text-amber-400"}
                    tooltip="Weighted manufacturing efficiency. Formula: (Σ Pack Fresh Output ÷ Σ Greige Issued) × 100. Higher = less process loss."
                />
                <KPICard
                    label="Shortfall Risk Rate"
                    value={`${kpis.shortfall_risk_pct}%`}
                    sub="Orders with Deficit Risk"
                    color={kpis.shortfall_risk_pct < 5 ? "text-emerald-400" : "text-red-400"}
                    tooltip="Percentage of orders where Output < Order Qty. Formula: (Count of orders with Pack Fresh < Order Qty ÷ Total Orders) × 100."
                />
                <KPICard
                    label="Active Orders"
                    value={kpis.total_orders}
                    sub="Total Sale Orders"
                    tooltip="Count of distinct Sale Order numbers in the loaded 1-year dataset."
                />
            </div>

            {/* 2. Charts Grid */}
            <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">

                {/* Finish Performance */}
                <ChartCard
                    title="Efficiency by Finish"
                    subtitle="Top 10 Finishes by Order Quantity"
                    description="Displays the average manufacturing efficiency percentage for the top 10 most heavily produced finish types. Helps identify which chemical or mechanical finishes cause the most process loss."
                >
                    <ResponsiveContainer width="100%" height="100%">
                        <BarChart data={distributions.finish} layout="vertical" margin={{ left: 40, right: 20 }}>
                            <CartesianGrid strokeDasharray="3 3" horizontal={true} vertical={false} stroke="#333" />
                            <XAxis type="number" domain={[80, 100]} stroke="#555" unit="%" />
                            <YAxis dataKey="Finish" type="category" stroke="#9ca3af" width={100} tick={{ fontSize: 11 }} />
                            <Tooltip
                                contentStyle={{ backgroundColor: '#171717', borderColor: '#404040' }}
                                cursor={{ fill: '#ffffff05' }}
                            />
                            <Bar dataKey="yield" fill="#3b82f6" radius={[0, 4, 4, 0]} name="Efficiency %" />
                        </BarChart>
                    </ResponsiveContainer>
                </ChartCard>

                {/* Route Performance */}
                <ChartCard
                    title="Efficiency by Route"
                    subtitle="Machine Type Analysis"
                    description="Compares the production efficiency across different dyeing machines and processing routes. Useful for spotting hardware or technique bottlenecks."
                >
                    <ResponsiveContainer width="100%" height="100%">
                        <BarChart data={distributions.route}>
                            <CartesianGrid strokeDasharray="3 3" stroke="#333" />
                            <XAxis dataKey="Route" stroke="#9ca3af" />
                            <YAxis domain={[80, 100]} stroke="#555" unit="%" />
                            <Tooltip contentStyle={{ backgroundColor: '#171717', borderColor: '#404040' }} />
                            <Bar dataKey="yield" fill="#10b981" radius={[4, 4, 0, 0]} name="Efficiency %" />
                        </BarChart>
                    </ResponsiveContainer>
                </ChartCard>

                {/* NEW: Yield by Shade */}
                {distributions.shade && distributions.shade.length > 0 && (
                    <ChartCard
                        title="Efficiency by Shade"
                        subtitle="Shade Type Analysis"
                        description="Shows the efficiency percentage grouped by base shade categories (e.g., Dyed, RFD, Bleach). Darker or more complex shades often have lower efficiency."
                    >
                        <ResponsiveContainer width="100%" height="100%">
                            <BarChart data={distributions.shade}>
                                <CartesianGrid strokeDasharray="3 3" stroke="#333" />
                                <XAxis dataKey="Shade Type" stroke="#9ca3af" tick={{ fontSize: 10 }} />
                                <YAxis domain={[80, 100]} stroke="#555" unit="%" />
                                <Tooltip contentStyle={{ backgroundColor: '#171717', borderColor: '#404040' }} />
                                <Bar dataKey="yield" fill="#8b5cf6" radius={[4, 4, 0, 0]} name="Efficiency %" />
                            </BarChart>
                        </ResponsiveContainer>
                    </ChartCard>
                )}

                {/* Monthly Trend */}
                <ChartCard
                    title="Efficiency Trend"
                    subtitle="Monthly Global Average"
                    description="Tracks the overall manufacturing efficiency rate month-over-month to show macro trends in production efficiency over time."
                >
                    <ResponsiveContainer width="100%" height="100%">
                        <LineChart data={trends}>
                            <CartesianGrid strokeDasharray="3 3" stroke="#333" />
                            <XAxis dataKey="month" stroke="#9ca3af" tick={{ fontSize: 11 }} />
                            <YAxis domain={['auto', 'auto']} stroke="#555" unit="%" />
                            <Tooltip contentStyle={{ backgroundColor: '#171717', borderColor: '#404040' }} />
                            <Line type="monotone" dataKey="yield" stroke="#f59e0b" strokeWidth={2} dot={{ r: 4 }} activeDot={{ r: 6 }} />
                        </LineChart>
                    </ResponsiveContainer>
                </ChartCard>

                {/* Complexity Bar Chart (Fixed from Radar) */}
                <ChartCard
                    title="Complexity & Deviation"
                    subtitle="Attribute Impact Analysis (Top Finishes)"
                    description="Highlights which product finishes diverge the most from the standard norms. A high deviation means the planner frequently overrides the system recommendations for this attribute."
                >
                    <ResponsiveContainer width="100%" height="100%">
                        <BarChart data={complexity} layout="vertical" margin={{ left: 40, right: 20 }}>
                            <CartesianGrid strokeDasharray="3 3" horizontal={true} vertical={false} stroke="#333" />
                            <XAxis type="number" stroke="#555" unit="%" />
                            <YAxis dataKey="attribute" type="category" stroke="#9ca3af" width={100} tick={{ fontSize: 11 }} />
                            <Tooltip
                                contentStyle={{ backgroundColor: '#171717', borderColor: '#404040' }}
                                cursor={{ fill: '#ffffff05' }}
                                formatter={(value: any) => [`${Number(value).toFixed(2)}%`, 'Avg Deviation']}
                            />
                            <Bar dataKey="avg_deviation" fill="#8884d8" radius={[0, 4, 4, 0]} name="Avg Deviation %" />
                        </BarChart>
                    </ResponsiveContainer>
                </ChartCard>

                {/* NEW: Global Blame/Friction Breakdown */}
                {global_blame && (
                    <ChartCard
                        title="Global Friction Breakdown"
                        subtitle="Where Effort is Lost"
                        description="Analyzes the root cause of shortfalls across all orders. Attributes blame to Policy (Norms too tight), Execution (Planner under-issued), or Process (Manufacturing loss exceeded buffer)."
                    >
                        <ResponsiveContainer width="100%" height="100%">
                            <PieChart margin={{ top: 0, right: 0, left: 0, bottom: 20 }}>
                                <Pie
                                    data={blameData}
                                    cx="50%"
                                    cy="45%"
                                    innerRadius={50}
                                    outerRadius={80}
                                    paddingAngle={3}
                                    dataKey="value"
                                    nameKey="name"
                                    // Removed the cramped inline labels to rely on Legend & Menu
                                    labelLine={false}
                                >
                                    {blameData.map((entry, index) => (
                                        <Cell key={`cell-${index}`} fill={entry.color} />
                                    ))}
                                </Pie>
                                <Legend
                                    verticalAlign="bottom"
                                    wrapperStyle={{ fontSize: '11px', paddingTop: '10px' }}
                                    layout="horizontal"
                                />
                                <Tooltip
                                    contentStyle={{ backgroundColor: '#171717', borderColor: '#404040', color: '#fff' }}
                                    itemStyle={{ color: '#fff' }}
                                    formatter={(value: any) => [`${Number(value).toFixed(1)}%`, 'Share of Shortfall']}
                                />
                            </PieChart>
                        </ResponsiveContainer>
                    </ChartCard>
                )}
            </div>

            {/* 3. NEW: Top Customers & Segment Analysis */}
            {(distributions.customer?.length > 0 || distributions.segment?.length > 0) && (
                <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
                    {/* Top Customers Table */}
                    {distributions.customer && distributions.customer.length > 0 && (
                        <div className="bg-neutral-900/40 border border-neutral-800 p-6 rounded-xl">
                            <h3 className="text-lg font-semibold text-neutral-200 mb-1">Top Customers</h3>
                            <p className="text-sm text-neutral-500 mb-4">By Order Quantity (Meters)</p>
                            <div className="overflow-auto max-h-[300px]">
                                <table className="w-full text-sm">
                                    <thead className="text-neutral-400 border-b border-neutral-700">
                                        <tr>
                                            <th className="text-left py-2 pr-4">Customer</th>
                                            <th className="text-right py-2 px-2">Order Qty <InfoTooltip content="Sum of all DORQT1 for this customer. Formula: Σ Order Qty (meters)." /></th>
                                            <th className="text-right py-2 pl-2">Efficiency % <InfoTooltip content="Pack Fresh ÷ Greige Issued × 100 for this customer." /></th>
                                        </tr>
                                    </thead>
                                    <tbody>
                                        {distributions.customer.map((c: any, i: number) => (
                                            <tr key={i} className="border-b border-neutral-800/50 hover:bg-neutral-800/30">
                                                <td className="py-2 pr-4 text-neutral-300 truncate max-w-[200px]" title={c.customer}>{c.customer}</td>
                                                <td className="py-2 px-2 text-right text-neutral-400">{(c.volume / 1000).toFixed(1)}K</td>
                                                <td className={`py-2 pl-2 text-right font-medium ${c.yield > 95 ? 'text-emerald-400' : 'text-amber-400'}`}>{c.yield}%</td>
                                            </tr>
                                        ))}
                                    </tbody>
                                </table>
                            </div>
                        </div>
                    )}

                    {/* Segment Distribution */}
                    {distributions.segment && distributions.segment.length > 0 && (
                        <ChartCard
                            title="Order Qty by Segment"
                            subtitle="Business Segment Breakdown"
                            description="Categorizes total mapped order quantity into internal business segments or product families for high-level portfolio analysis."
                        >
                            <ResponsiveContainer width="100%" height="100%">
                                <BarChart data={distributions.segment} layout="vertical" margin={{ left: 60, right: 20 }}>
                                    <CartesianGrid strokeDasharray="3 3" horizontal={true} vertical={false} stroke="#333" />
                                    <XAxis type="number" stroke="#555" tickFormatter={(v) => `${(v / 1000).toFixed(0)}K`} />
                                    <YAxis dataKey="segment" type="category" stroke="#9ca3af" width={120} tick={{ fontSize: 11 }} />
                                    <Tooltip
                                        contentStyle={{ backgroundColor: '#171717', borderColor: '#404040' }}
                                        formatter={(value: any) => [`${(value / 1000).toFixed(1)}K meters`, 'Order Qty']}
                                    />
                                    <Bar dataKey="volume" fill="#14b8a6" radius={[0, 4, 4, 0]} name="Order Qty" />
                                </BarChart>
                            </ResponsiveContainer>
                        </ChartCard>
                    )}
                </div>
            )
            }

            {/* 4. NEW: Global Waterfall (Opportunity Loss) */}
            {
                global_waterfall && (
                    <div className="bg-neutral-900/40 border border-neutral-800 p-6 rounded-xl">
                        <h3 className="text-lg font-semibold text-neutral-200 mb-1">Global Opportunity Waterfall <InfoTooltip content="Visualizes the material flow from Order Quantity to final Output. Each bar shows how Reserved Qty, Issued Qty, and Process Loss transform the original order into delivered meters." /></h3>
                        <p className="text-sm text-neutral-500 mb-6">Order Quantity → Delivery Flow (Meters)</p>
                        <div className="h-[250px] w-full">
                            <ResponsiveContainer width="100%" height="100%">
                                <BarChart data={global_waterfall} margin={{ top: 20, right: 30, left: 20, bottom: 5 }}>
                                    <CartesianGrid strokeDasharray="3 3" vertical={false} stroke="#333" />
                                    <XAxis dataKey="label" stroke="#9ca3af" tick={{ fontSize: 11 }} />
                                    <YAxis stroke="#555" tickFormatter={(v) => `${(v / 1000000).toFixed(1)}M`} />
                                    <Tooltip
                                        contentStyle={{ backgroundColor: '#171717', borderColor: '#404040' }}
                                        formatter={(value: any, name: any, props: any) => {
                                            const isPositive = props.payload.value >= 0;
                                            return [`${isPositive ? '+' : ''}${(Number(value) / 1000000).toFixed(2)}M`, props.payload.desc || props.payload.label];
                                        }}
                                    />
                                    <Bar dataKey="value" radius={[4, 4, 0, 0]}>
                                        {global_waterfall.map((entry: any, index: number) => {
                                            const bgColor = entry.type === 'base' ? '#3b82f6' :
                                                entry.type === 'final' ? '#10b981' :
                                                    entry.value >= 0 ? '#f59e0b' : '#ef4444';
                                            return <Cell key={`cell-${index}`} fill={bgColor} />;
                                        })}
                                    </Bar>
                                </BarChart>
                            </ResponsiveContainer>
                        </div>
                    </div>
                )
            }
        </div >
    )
}

function KPICard({ label, value, sub, color = "text-white", tooltip }: { label: string, value: string | number, sub: string, color?: string, tooltip?: string }) {
    return (
        <div className="bg-neutral-900/40 border border-neutral-800 p-6 rounded-xl relative group">
            <h4 className="flex items-center gap-2 text-neutral-400 text-sm font-medium uppercase tracking-wider mb-2">
                {label}
                {tooltip && <InfoTooltip content={tooltip} />}
            </h4>
            <div className={`text-3xl font-bold ${color} mb-1`}>{value}</div>
            <div className="text-neutral-500 text-xs">{sub}</div>
        </div>
    )
}

function ChartCard({ title, subtitle, description, children }: { title: string, subtitle: string, description?: string, children: React.ReactNode }) {
    return (
        <div className="bg-neutral-900/40 border border-neutral-800 p-6 rounded-xl min-h-[350px] flex flex-col group relative">
            <div className="mb-6 pr-8">
                <h3 className="flex items-center gap-2 text-lg font-semibold text-neutral-200">
                    {title}
                    {description && <InfoTooltip content={description} />}
                </h3>
                <p className="text-sm text-neutral-500">{subtitle}</p>
            </div>
            <div className="flex-1 min-h-[250px] relative z-10">
                {children}
            </div>
        </div>
    )
}