<?php

namespace App\Http\Controllers\Admin\Manage;

use App\Http\Controllers\Controller;
use App\Http\Requests\Admin\Manage\Purchase\PurchaseRequest;
use App\Models\Product;
use App\Models\Purchase;
use App\Models\PurchaseItem;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Inertia\Inertia;
use Inertia\Response;

class PurchaseController extends Controller
{
    public function index(): Response
    {
        return Inertia::render('admin/manage/purchase/index', [
            'purchases' => Purchase::with(['items.product'])->latest()->get(),
        ]);
    }

    public function create(): Response
    {
        return Inertia::render('admin/manage/purchase/create', [
            'products' => Product::with(['prices', 'categories'])->active()->get(),
            'cartItems' => PurchaseItem::with(['product.prices', 'product.categories'])
                ->where('user_id', auth()->id())
                ->where('purchase_id', null)
                ->latest()
                ->get(),
        ]);
    }

    public function store(PurchaseRequest $request): RedirectResponse
    {
        $validated = $request->validated();

        DB::transaction(function () use ($validated) {
            $total = collect($validated['items'])->sum(fn ($item) => $item['quantity'] * $item['unit_price']);

            $purchase = Purchase::create([
                'purchase_date' => $validated['purchase_date'],
                'note' => $validated['note'],
                'total' => $total,
            ]);

            foreach ($validated['items'] as $item) {
                PurchaseItem::create([
                    'user_id' => auth()->id(),
                    'purchase_id' => $purchase->id,
                    'product_id' => $item['product_id'],
                    'quantity' => $item['quantity'],
                    'unit_price' => $item['unit_price'],
                    'total_price' => $item['quantity'] * $item['unit_price'],
                ]);

                Product::find($item['product_id'])->increment('stock', $item['quantity']);
            }

            PurchaseItem::where('user_id', auth()->id())
                ->where('purchase_id', null)
                ->delete();
        });

        return redirect()->route('purchase.index')->with('success', 'Data berhasil disimpan');
    }

    public function edit(Purchase $purchase): Response
    {
        $purchase->load(['items.product']);

        return Inertia::render('admin/manage/purchase/edit', [
            'purchase' => $purchase,
            'products' => Product::with(['prices', 'categories'])->active()->get(),
        ]);
    }

    public function update(PurchaseRequest $request, Purchase $purchase): RedirectResponse
    {
        $validated = $request->validated();

        DB::transaction(function () use ($validated, $purchase) {
            $total = collect($validated['items'])->sum(fn ($item) => $item['quantity'] * $item['unit_price']);

            $purchase->update([
                'purchase_date' => $validated['purchase_date'],
                'note' => $validated['note'],
                'total' => $total,
            ]);

            foreach ($purchase->items as $item) {
                $item->product->decrement('stock', $item->quantity);
            }

            $purchase->items()->delete();

            foreach ($validated['items'] as $item) {
                $purchase->items()->create([
                    'user_id' => auth()->id(),
                    'product_id' => $item['product_id'],
                    'quantity' => $item['quantity'],
                    'unit_price' => $item['unit_price'],
                    'total_price' => $item['quantity'] * $item['unit_price'],
                ]);

                Product::find($item['product_id'])->increment('stock', $item['quantity']);
            }
        });

        return redirect()->route('purchase.index')->with('success', 'Data berhasil diperbarui');
    }

    public function destroy(Purchase $purchase): RedirectResponse
    {
        DB::transaction(function () use ($purchase) {
            foreach ($purchase->items as $item) {
                $item->product->decrement('stock', $item->quantity);
            }
            $purchase->delete();
        });

        return redirect()->back()->with('success', 'Data berhasil dihapus');
    }

    public function bulkDestroy(Request $request): RedirectResponse
    {
        $ids = $request->input('ids');

        DB::transaction(function () use ($ids) {
            $purchases = Purchase::with('items')->whereIn('id', $ids)->get();
            foreach ($purchases as $purchase) {
                foreach ($purchase->items as $item) {
                    $item->product->decrement('stock', $item->quantity);
                }
                $purchase->delete();
            }
        });

        return redirect()->back()->with('success', 'Data terpilih berhasil dihapus');
    }
}