<?php

namespace App\Http\Controllers;

use App\Models\Expense;
use App\Models\Order;
use App\Models\OrderItem;
use App\Models\Purchase;
use Carbon\Carbon;
use Inertia\Inertia;

class DashboardController extends Controller
{
    public function __invoke()
    {
        $today = Carbon::today();
        $yesterday = Carbon::yesterday();

        $stats = [
            'total_penjualan' => $this->getStats($today, $yesterday, fn ($date) => Order::whereDate('created_at', $date)->count()),
            'total_pendapatan' => $this->getStats($today, $yesterday, fn ($date) => Order::whereDate('created_at', $date)->sum('total')),
            'total_pengeluaran' => $this->getStats($today, $yesterday, fn ($date) => Expense::whereDate('created_at', $date)->sum('amount')),
            'hpp' => $this->getStats($today, $yesterday, fn ($date) => Order::whereDate('created_at', $date)->sum('hpp')),
            'total_diskon' => $this->getStats($today, $yesterday, fn ($date) => Order::whereDate('created_at', $date)->sum('discount')),
            'total_pembelian' => $this->getStats($today, $yesterday, fn ($date) => Purchase::whereDate('created_at', $date)->sum('total')),
            'produk_terjual' => $this->getStats($today, $yesterday, fn ($date) => OrderItem::whereHas('order', fn ($q) => $q->whereDate('created_at', $date))->sum('qty')),
            'total_pelanggan' => $this->getStats($today, $yesterday, fn ($date) => Order::whereDate('created_at', $date)->distinct('customer_name')->count('customer_name')),
        ];

        // Complex stats
        $stats['aov'] = $this->calculateAov($stats['total_pendapatan'], $stats['total_penjualan']);
        $stats['laba_kotor'] = $this->calculateDiff($stats['total_pendapatan'], $stats['hpp']);
        $stats['laba_bersih'] = $this->calculateDiff($stats['laba_kotor'], $stats['total_pengeluaran']);
        $stats['profit_margin'] = $this->calculateMargin($stats['laba_bersih'], $stats['total_pendapatan']);

        // Chart Data
        $stats['charts'] = [
            'jam_sibuk' => $this->getJamSibuk($today, $yesterday),
            'order_by_payment' => $this->getOrderByEnum($today, 'payment_method', \App\Enums\PaymentMethod::class),
            'order_by_status' => $this->getOrderByEnum($today, 'order_status', \App\Enums\OrderStatus::class),
            'order_by_channel' => $this->getOrderByEnum($today, 'order_channel', \App\Enums\OrderChannel::class),
            'top_products' => $this->getTopProducts($today),
        ];

        return Inertia::render('dashboard', [
            'stats' => $stats,
        ]);
    }

    private function getJamSibuk($today, $yesterday)
    {
        $todayData = Order::whereDate('created_at', $today)
            ->selectRaw('HOUR(created_at) as hour, count(*) as count')
            ->groupBy('hour')
            ->pluck('count', 'hour')
            ->toArray();

        $yesterdayData = Order::whereDate('created_at', $yesterday)
            ->selectRaw('HOUR(created_at) as hour, count(*) as count')
            ->groupBy('hour')
            ->pluck('count', 'hour')
            ->toArray();

        $chartData = [];
        for ($i = 0; $i < 24; $i++) {
            $chartData[] = [
                'hour' => sprintf('%02d:00', $i),
                'today' => $todayData[$i] ?? 0,
                'yesterday' => $yesterdayData[$i] ?? 0,
            ];
        }

        return $chartData;
    }

    private function getOrderByEnum($date, $column, $enumClass)
    {
        $data = Order::whereDate('created_at', $date)
            ->selectRaw("$column, count(*) as count")
            ->groupBy($column)
            ->get();

        return $data->map(function($item) use ($column, $enumClass) {
            $enumValue = $item->$column;
            $label = $enumValue instanceof $enumClass ? $enumValue->label() : $enumValue;
            return [
                'name' => $label,
                'value' => $item->count,
            ];
        });
    }

    private function getTopProducts($date)
    {
        return OrderItem::whereHas('order', fn($q) => $q->whereDate('created_at', $date))
            ->with('product:id,name')
            ->selectRaw('product_id, sum(qty) as total_qty')
            ->groupBy('product_id')
            ->orderByDesc('total_qty')
            ->limit(5)
            ->get()
            ->map(fn($item) => [
                'name' => $item->product->name ?? 'Unknown',
                'qty' => (int) $item->total_qty,
            ]);
    }

    private function getStats($today, $yesterday, $callback)
    {
        $todayVal = $callback($today);
        $yesterdayVal = $callback($yesterday);

        return [
            'value' => $todayVal,
            'yesterday' => $yesterdayVal,
            'change' => $this->calculatePercentageChange($todayVal, $yesterdayVal),
        ];
    }

    private function calculatePercentageChange($current, $previous)
    {
        if ($previous == 0) {
            return $current > 0 ? 100 : 0;
        }

        return round((($current - $previous) / $previous) * 100, 2);
    }

    private function calculateAov($revenue, $sales)
    {
        $todayVal = $sales['value'] > 0 ? $revenue['value'] / $sales['value'] : 0;
        $yesterdayVal = $sales['yesterday'] > 0 ? $revenue['yesterday'] / $sales['yesterday'] : 0;

        return [
            'value' => $todayVal,
            'yesterday' => $yesterdayVal,
            'change' => $this->calculatePercentageChange($todayVal, $yesterdayVal),
        ];
    }

    private function calculateDiff($a, $b)
    {
        $todayVal = $a['value'] - $b['value'];
        $yesterdayVal = $a['yesterday'] - $b['yesterday'];

        return [
            'value' => $todayVal,
            'yesterday' => $yesterdayVal,
            'change' => $this->calculatePercentageChange($todayVal, $yesterdayVal),
        ];
    }

    private function calculateMargin($profit, $revenue)
    {
        $todayVal = $revenue['value'] > 0 ? ($profit['value'] / $revenue['value']) * 100 : 0;
        $yesterdayVal = $revenue['yesterday'] > 0 ? ($profit['yesterday'] / $revenue['yesterday']) * 100 : 0;

        return [
            'value' => round($todayVal, 2),
            'yesterday' => round($yesterdayVal, 2),
            'change' => $this->calculatePercentageChange($todayVal, $yesterdayVal),
        ];
    }
}