<?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\Payroll;
use App\Models\Purchase;
use Illuminate\Support\Facades\DB;
use Inertia\Inertia;

class AnalysisController extends Controller
{
    public function __invoke()
    {
        $stats = [
            'total_sales' => $this->getStats(fn () => Order::count()),
            'total_revenue' => $this->getStats(fn () => Order::sum('total')),
            'total_expenses' => $this->getStats(fn () => Expense::sum('amount')),
            'total_payrolls' => $this->getStats(fn () => Payroll::sum('total_salary')),
            'cogs' => $this->getStats(fn () => Order::sum('hpp')),
            'total_discount' => $this->getStats(fn () => Order::sum('discount')),
            'total_purchases' => $this->getStats(fn () => Purchase::sum('total')),
            'products_sold' => $this->getStats(fn () => OrderItem::sum('qty')),
            'total_customers' => $this->getStats(fn () => Order::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'] = [
            'value' => $stats['gross_profit']['value'] - $stats['total_expenses']['value'] - $stats['total_payrolls']['value'],
            'yesterday' => null,
            'change' => null,
        ];
        $stats['profit_margin'] = $this->calculateMargin($stats['net_profit'], $stats['total_revenue']);

        // Revenue vs Purchases per month (this year)
        $revenueByMonth = DB::table('orders')
            ->select(
                DB::raw('MONTH(created_at) as month'),
                DB::raw('SUM(total) as total')
            )
            ->groupBy(DB::raw('MONTH(created_at)'))
            ->get();

        $purchasesByMonth = DB::table('purchases')
            ->select(
                DB::raw('MONTH(created_at) as month'),
                DB::raw('SUM(total) as total')
            )
            ->groupBy(DB::raw('MONTH(created_at)'))
            ->get();

        $monthNames = ['Jan', 'Feb', 'Mar', 'Apr', 'Mei', 'Jun', 'Jul', 'Agu', 'Sep', 'Okt', 'Nov', 'Des'];

        $salesByMonth = collect(range(1, 12))->map(function ($month) use ($revenueByMonth, $purchasesByMonth, $monthNames) {
            $revenueFound = $revenueByMonth->firstWhere('month', $month);
            $purchasesFound = $purchasesByMonth->firstWhere('month', $month);

            return [
                'month' => $monthNames[$month - 1],
                'sales' => $revenueFound ? (float) $revenueFound->total : 0,
                'purchase' => $purchasesFound ? (float) $purchasesFound->total : 0,
            ];
        });

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

                return $item;
            });

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

                return $item;
            });

        $orderChannels = DB::table('orders')
            ->select('order_channel as name', DB::raw('COUNT(*) as total'))
            ->groupBy('order_channel')
            ->get()
            ->map(function ($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')
            ->select('products.name as name', DB::raw('SUM(order_items.qty) as total'))
            ->groupBy('products.name')
            ->orderByDesc('total')
            ->limit(5)
            ->get();

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

        $salesByHourRaw = DB::table('orders')
            ->select(
                DB::raw('HOUR(created_at) as hour'),
                DB::raw('COUNT(*) as total')
            )
            ->groupBy(DB::raw('HOUR(created_at)'))
            ->get();

        $salesByHour = collect(range(0, 23))->map(function ($hour) use ($salesByHourRaw) {
            $found = $salesByHourRaw->firstWhere('hour', $hour);

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

        // Revenue & Profit & Volume per month
        $ordersByMonth = DB::table('orders')
            ->select(
                DB::raw('MONTH(created_at) as month'),
                DB::raw('SUM(total) as revenue'),
                DB::raw('SUM(hpp) as cogs'),
                DB::raw('COUNT(*) as count')
            )
            ->groupBy(DB::raw('MONTH(created_at)'))
            ->get();

        $expensesByMonth = DB::table('expenses')
            ->select(
                DB::raw('MONTH(created_at) as month'),
                DB::raw('SUM(amount) as total')
            )
            ->groupBy(DB::raw('MONTH(created_at)'))
            ->get();

        $payrollsByMonth = DB::table('payrolls')
            ->select(
                DB::raw('MONTH(period_month) as month'),
                DB::raw('SUM(total_salary) as total')
            )
            ->whereNull('deleted_at')
            ->groupBy(DB::raw('MONTH(period_month)'))
            ->get();

        $revenueVsProfit = collect(range(1, 12))->map(function ($month) use ($ordersByMonth, $expensesByMonth, $payrollsByMonth, $monthNames) {
            $orderFound = $ordersByMonth->firstWhere('month', $month);
            $expenseFound = $expensesByMonth->firstWhere('month', $month);
            $payrollFound = $payrollsByMonth->firstWhere('month', $month);

            $revenue = $orderFound ? (float) $orderFound->revenue : 0;
            $cogs = $orderFound ? (float) $orderFound->cogs : 0;
            $expense = $expenseFound ? (float) $expenseFound->total : 0;
            $payroll = $payrollFound ? (float) $payrollFound->total : 0;
            $profit = $revenue - $cogs - $expense - $payroll;

            return [
                'month' => $monthNames[$month - 1],
                'revenue' => $revenue,
                'profit' => $profit,
            ];
        });

        $transactionVolume = collect(range(1, 12))->map(function ($month) use ($ordersByMonth, $monthNames) {
            $found = $ordersByMonth->firstWhere('month', $month);
            $count = $found ? (int) $found->count : 0;
            $revenue = $found ? (float) $found->revenue : 0;
            $aov = $count > 0 ? $revenue / $count : 0;

            return [
                'month' => $monthNames[$month - 1],
                'count' => $count,
                'aov' => $aov,
            ];
        });

        $topCategories = DB::table('order_items')
            ->join('products', 'order_items.product_id', '=', 'products.id')
            ->join('category_product', 'products.id', '=', 'category_product.product_id')
            ->join('categories', 'category_product.category_id', '=', 'categories.id')
            ->select('categories.name', DB::raw('SUM(order_items.qty) as total'))
            ->whereNull('order_items.deleted_at')
            ->groupBy('categories.id', 'categories.name')
            ->orderByDesc('total')
            ->limit(5)
            ->get();

        return Inertia::render('analysis', [
            'stats' => $stats,
            'salesByMonth' => $salesByMonth,
            'revenueVsProfit' => $revenueVsProfit,
            'transactionVolume' => $transactionVolume,
            'salesByHour' => $salesByHour,
            'paymentMethods' => $paymentMethods,
            'orderStatuses' => $orderStatuses,
            'orderChannels' => $orderChannels,
            'topProducts' => $topProducts,
            'topCustomers' => $topCustomers,
            'topCategories' => $topCategories,
        ]);
    }

    private function getStats(callable $callback): array
    {
        $value = $callback();

        return [
            'value' => $value,
            'yesterday' => null,
            'change' => null,
        ];
    }

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

        return [
            'value' => $value,
            'yesterday' => null,
            'change' => null,
        ];
    }

    private function calculateDiff($a, $b): array
    {
        return [
            'value' => $a['value'] - $b['value'],
            'yesterday' => null,
            'change' => null,
        ];
    }

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

        return [
            'value' => round($value, 2),
            'yesterday' => null,
            'change' => null,
        ];
    }
}