<?php

namespace App\Http\Controllers;

use App\Enums\OrderChannel;
use App\Enums\OrderStatus;
use App\Enums\PaymentMethod;
use App\Models\Expense;
use App\Models\Order;
use App\Models\OrderItem;
use App\Models\Purchase;
use Carbon\Carbon;
use Illuminate\Support\Facades\DB;
use Inertia\Inertia;

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

        $stats = [
            'total_sales' => $this->getStats($today, $yesterday, fn ($date) => Order::whereDate('created_at', $date)->count()),
            'total_revenue' => $this->getStats($today, $yesterday, fn ($date) => Order::whereDate('created_at', $date)->sum('total')),
            'total_expenses' => $this->getStats($today, $yesterday, fn ($date) => Expense::whereDate('created_at', $date)->sum('amount')),
            'cogs' => $this->getStats($today, $yesterday, fn ($date) => Order::whereDate('created_at', $date)->sum('cogs')),
            'total_discount' => $this->getStats($today, $yesterday, fn ($date) => Order::whereDate('created_at', $date)->sum('discount')),
            'total_purchases' => $this->getStats($today, $yesterday, fn ($date) => Purchase::whereDate('created_at', $date)->sum('total')),
            'products_sold' => $this->getStats($today, $yesterday, fn ($date) => OrderItem::whereHas('order', fn ($q) => $q->whereDate('created_at', $date))->sum('qty')),
            'total_customers' => $this->getStats($today, $yesterday, fn ($date) => Order::whereDate('created_at', $date)->distinct('customer_name')->count('customer_name')),
        ];

        $stats['aov'] = $this->calculateAov($stats['total_revenue'], $stats['total_sales']);
        $stats['gross_profit'] = $this->calculateDiff($stats['total_revenue'], $stats['cogs']);
        $stats['net_profit'] = $this->calculateDiff($stats['gross_profit'], $stats['total_expenses']);
        $stats['profit_margin'] = $this->calculateMargin($stats['net_profit'], $stats['total_revenue']);

        $isSqlite = DB::getDriverName() === 'sqlite';
        $hourSelect = $isSqlite ? "CAST(strftime('%H', created_at) AS INTEGER)" : 'HOUR(created_at)';

        // Get sales by hour
        $todayOrders = DB::table('orders')
            ->whereDate('created_at', $today)
            ->select(
                DB::raw("$hourSelect as hour"),
                DB::raw('COUNT(*) as total')
            )
            ->groupBy(DB::raw($hourSelect))
            ->get();

        $yesterdayOrders = DB::table('orders')
            ->whereDate('created_at', $yesterday)
            ->select(
                DB::raw("$hourSelect as hour"),
                DB::raw('COUNT(*) as total')
            )
            ->groupBy(DB::raw($hourSelect))
            ->get();

        $salesByHour = collect(range(0, 23))->map(function ($hour) use ($todayOrders, $yesterdayOrders) {
            $todayFound = $todayOrders->firstWhere('hour', $hour);
            $yesterdayFound = $yesterdayOrders->firstWhere('hour', $hour);

            return [
                'hour' => str_pad($hour, 2, '0', STR_PAD_LEFT).':00',
                'today' => $todayFound ? (int) $todayFound->total : 0,
                'yesterday' => $yesterdayFound ? (int) $yesterdayFound->total : 0,
            ];
        });

        $paymentMethods = DB::table('orders')
            ->select('payment_method as name', DB::raw('COUNT(*) as total'))
            ->whereDate('created_at', $today)
            ->groupBy('payment_method')
            ->get()
            ->map(function ($item) {
                if ($item->name) {
                    $item->name = PaymentMethod::tryFrom($item->name)?->label() ?? $item->name;
                }

                return $item;
            });

        $orderStatuses = DB::table('orders')
            ->select('order_status as name', DB::raw('COUNT(*) as total'))
            ->whereDate('created_at', $today)
            ->groupBy('order_status')
            ->get()
            ->map(function ($item) {
                if ($item->name) {
                    $item->name = OrderStatus::tryFrom($item->name)?->label() ?? $item->name;
                }

                return $item;
            });

        $orderChannels = DB::table('orders')
            ->select('order_channel as name', DB::raw('COUNT(*) as total'))
            ->whereDate('created_at', $today)
            ->groupBy('order_channel')
            ->get()
            ->map(function ($item) {
                if ($item->name) {
                    $item->name = OrderChannel::tryFrom($item->name)?->label() ?? $item->name;
                }

                return $item;
            });

        $topProducts = DB::table('order_items')
            ->join('products', 'order_items.product_id', '=', 'products.id')
            ->join('orders', 'order_items.order_id', '=', 'orders.id')
            ->select('products.name as name', DB::raw('SUM(order_items.qty) as total'))
            ->whereDate('orders.created_at', $today)
            ->groupBy('products.name')
            ->orderByDesc('total')
            ->limit(5)
            ->get();

        $topCustomers = DB::table('orders')
            ->select('customer_name as name', DB::raw('SUM(total) as total'))
            ->whereDate('created_at', $today)
            ->whereNotNull('customer_name')
            ->groupBy('customer_name')
            ->orderByDesc('total')
            ->limit(5)
            ->get();

        return Inertia::render('dashboard', [
            'stats' => $stats,
            'salesByHour' => $salesByHour,
            'paymentMethods' => $paymentMethods,
            'orderStatuses' => $orderStatuses,
            'orderChannels' => $orderChannels,
            'topProducts' => $topProducts,
            'topCustomers' => $topCustomers,
        ]);
    }

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

        $diff = $todayVal - $yesterdayVal;
        $change = $this->calculatePercentageChange($todayVal, $yesterdayVal);

        return [
            'value' => $todayVal,
            'yesterday' => $yesterdayVal,
            'diff' => $diff,
            'change' => $change,
        ];
    }

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

        return round((($current - $previous) / abs($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): array
    {
        $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): array
    {
        $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),
        ];
    }
}