<?php

namespace App\Http\Controllers\Admin\Inventory;

use App\Http\Controllers\Controller;
use App\Http\Requests\Inventory\ReceiveStockEntryRequest;
use App\Http\Requests\Inventory\StoreStockEntryRequest;
use App\Http\Requests\Inventory\UpdateStockEntryRequest;
use App\Models\Ingredient;
use App\Models\Location;
use App\Models\MaterialQuality;
use App\Models\PackagingItem;
use App\Models\StockEntry;
use App\Models\Supplier;
use App\Models\TaxRate;
use App\Repositories\StockEntryRepository;
use App\Services\DeletionGuard;
use App\Services\InventoryService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Validation\ValidationException;
use Illuminate\View\View;

class StockEntryController extends Controller
{
    public function __construct(
        protected StockEntryRepository $stockEntryRepository
    ) {}

    public function index(Request $request): View
    {
        $limit = $request->boolean('all') ? null : 500;

        return view('admin.inventory.stock-entries.index', array_merge($this->formSharedData(), [
            'values' => $this->stockEntryRepository->listForIndex($limit),
            'listLimit' => $limit,
        ]));
    }

    public function create(Request $request): View|RedirectResponse
    {
        if (! auth()->user()->isAdmin()) {
            return redirect()->route('home');
        }

        $model = new StockEntry([
            'ordered_at' => now()->toDateString(),
            'entry_type' => 'ingredient',
            // AP-50/F-17: Köln (aktiv) als Standard-Lagerort — zentral in Location::defaultId().
            'location_id' => Location::defaultId(),
        ]);

        $ingredientId = (int) $request->query('ingredient_id');
        if ($ingredientId > 0) {
            $ingredient = Ingredient::query()->find($ingredientId);
            if ($ingredient) {
                $model->entry_type = 'ingredient';
                $model->ingredient_id = $ingredient->id;
                $model->setRelation('ingredient', $ingredient);
            }
        }

        return view('admin.inventory.stock-entries.create', array_merge($this->formSharedData(), [
            'model' => $model,
        ]));
    }

    public function store(StoreStockEntryRequest $request): RedirectResponse
    {
        if (! $request->user()->isAdmin()) {
            return redirect()->route('home');
        }

        $data = $request->validatedPayload();
        $data['ordered_by'] = (int) auth()->id();

        $this->stockEntryRepository->create($data);

        \Session::flash('alert-save', '1');

        return redirect()->route('admin.inventory.stock-entries.index');
    }

    public function show(StockEntry $stockEntry): View
    {
        $stockEntry->load([
            'ingredient',
            'packagingItem.packagingMaterial',
            'supplier',
            'location',
            'quality',
            'orderedByUser.account',
            'receivedByUser.account',
        ]);

        return view('admin.inventory.stock-entries.show', array_merge($this->formSharedData(), [
            'model' => $stockEntry,
            'materialQualities' => MaterialQuality::query()->orderBy('pos')->orderBy('name')->get(),
        ]));
    }

    public function edit(StockEntry $stockEntry): View|RedirectResponse
    {
        if (! auth()->user()->isAdmin()) {
            return redirect()->route('home');
        }
        if (! $stockEntry->isPending()) {
            \Session::flash('alert-error', __('Nur offene Bestellungen können bearbeitet werden.'));

            return redirect()->route('admin.inventory.stock-entries.show', $stockEntry);
        }

        $stockEntry->load(['ingredient', 'packagingItem']);

        return view('admin.inventory.stock-entries.edit', array_merge($this->formSharedData(), [
            'model' => $stockEntry,
        ]));
    }

    public function update(UpdateStockEntryRequest $request, StockEntry $stockEntry): RedirectResponse
    {
        if (! $request->user()->isAdmin()) {
            return redirect()->route('home');
        }
        if (! $stockEntry->isPending()) {
            \Session::flash('alert-error', __('Nur offene Bestellungen können bearbeitet werden.'));

            return redirect()->route('admin.inventory.stock-entries.show', $stockEntry);
        }

        $this->stockEntryRepository->update($stockEntry, $request->validatedPayload());

        \Session::flash('alert-save', '1');

        return redirect()->route('admin.inventory.stock-entries.index');
    }

    public function copy(StockEntry $stockEntry): RedirectResponse
    {
        if (! auth()->user()->isAdmin()) {
            return redirect()->route('home');
        }

        $data = $stockEntry->only([
            'entry_type',
            'ingredient_id',
            'packaging_item_id',
            'supplier_id',
            'location_id',
            'ordered_quantity',
            'price_per_kg',
            'price_per_kg_gross',
            'price_total',
            'tax_rate_id',
            'tax_rate_percent',
            'quality_id',
        ]);
        $data['ordered_at'] = now()->toDateString();
        $data['ordered_by'] = (int) auth()->id();
        $data['status'] = 'pending';

        // Prüfung 08.09.2026 F-15: In ml erfasste Bestellungen als ml kopieren — Menge
        // zurück in ml (über den Dichte-Snapshot), Einheit und Dichte mitgeben. Sonst wird
        // die Kopie zur Gramm-Bestellung und ein Wareneingang „100“ bucht 100 g statt 79 g.
        if ($stockEntry->purchase_unit === 'ml' && $stockEntry->density_used !== null && (float) $stockEntry->density_used > 0) {
            $data['ordered_unit'] = 'ml';
            $data['ordered_quantity'] = roundWawiQuantity((float) $stockEntry->ordered_quantity / (float) $stockEntry->density_used);
            $data['density_used'] = (float) $stockEntry->density_used;
        }

        $copy = $this->stockEntryRepository->create($data);

        \Session::flash('alert-warning', __('Kopie angelegt – bitte Menge/Charge prüfen und speichern.'));

        return redirect()->route('admin.inventory.stock-entries.edit', $copy);
    }

    public function destroy(StockEntry $stockEntry): RedirectResponse
    {
        if (! auth()->user()->isAdmin()) {
            return redirect()->route('home');
        }

        // Anforderung 15.07.2026: auch gebuchte Eingänge löschbar (Soft-Delete),
        // sofern keine Abhängigkeiten (Produktions-Verbrauch, Ausschuss) bestehen.
        $guard = app(DeletionGuard::class);
        $blockers = $guard->blockersFor($stockEntry);
        if ($blockers !== []) {
            \Session::flash('alert-error', $guard->message($blockers));

            return redirect()->route('admin.inventory.stock-entries.index');
        }

        $stockEntry->delete();

        \Session::flash('alert-success', __('Eintrag gelöscht'));

        return redirect()->route('admin.inventory.stock-entries.index');
    }

    public function receive(ReceiveStockEntryRequest $request, StockEntry $stockEntry): RedirectResponse
    {
        if (! $stockEntry->isPending()) {
            \Session::flash('alert-error', __('Eintrag nicht mehr offen.'));

            return redirect()->route('admin.inventory.stock-entries.show', $stockEntry);
        }

        $data = $request->validated();
        if ($stockEntry->entry_type !== 'ingredient') {
            $data['quality_id'] = null;
            $data['best_before'] = null;
        }

        try {
            $this->stockEntryRepository->receive($stockEntry, $data);
        } catch (ValidationException $e) {
            \Session::flash('alert-error', $e->errors()['status'][0] ?? __('Eintrag nicht mehr offen.'));

            return redirect()->route('admin.inventory.stock-entries.show', $stockEntry);
        }

        \Session::flash('alert-save', '1');

        return redirect()->route('admin.inventory.stock-entries.show', $stockEntry->fresh());
    }

    /**
     * AP-27: Existenz-Check beim Buchen des Wareneingangs — ist die Charge
     * (batch_number + ingredient_id) schon im Haus? Liefert Hinweis-Daten
     * und Vorbelegungswerte (MHD/Qualität) aus dem letzten Eingang der Charge.
     */
    public function batchCheck(Request $request, InventoryService $inventoryService): JsonResponse
    {
        $ingredientId = (int) $request->query('ingredient_id');
        $batchNumber = trim((string) $request->query('batch_number', ''));
        $excludeId = (int) $request->query('exclude', 0);
        // Audit N-1: Chargen sind je Lieferant getrennt — gleiche Lot-Nummer
        // eines anderen Lieferanten ist keine vorhandene Charge.
        $supplierId = (int) $request->query('supplier_id', 0);

        if ($ingredientId < 1 || $batchNumber === '') {
            return response()->json(['exists' => false]);
        }

        $entries = StockEntry::query()
            ->with('location')
            ->where('entry_type', 'ingredient')
            ->where('status', 'received')
            ->where('ingredient_id', $ingredientId)
            ->where('batch_number', $batchNumber)
            ->when($supplierId > 0, fn ($q) => $q->where('supplier_id', $supplierId))
            ->when($excludeId > 0, fn ($q) => $q->where('id', '!=', $excludeId))
            ->orderByDesc('received_at')
            ->orderByDesc('id')
            ->get();

        if ($entries->isEmpty()) {
            return response()->json(['exists' => false]);
        }

        $latest = $entries->first();
        $remaining = $inventoryService->chargesWithRemainingForIngredient($ingredientId)
            ->filter(fn (StockEntry $e) => trim((string) $e->batch_number) === $batchNumber
                && ($supplierId === 0 || (int) $e->supplier_id === $supplierId)
                && $e->id !== $excludeId)
            ->sum(fn (StockEntry $e) => (float) $e->getAttribute('remaining_quantity'));

        return response()->json([
            'exists' => true,
            'purchases' => $entries->count(),
            'remaining' => roundWawiQuantity((float) $remaining),
            'best_before' => $latest->best_before?->format('d.m.Y'),
            'location' => $latest->location?->name,
            'quality_id' => $latest->quality_id,
        ]);
    }

    public function searchIngredients(Request $request): JsonResponse
    {
        $term = trim((string) $request->query('q', ''));
        if (mb_strlen($term) < 1) {
            return response()->json(['results' => []]);
        }

        $rows = Ingredient::query()
            ->where('active', true)
            ->where(function ($query) use ($term) {
                $query->where('name', 'like', '%'.$term.'%')
                    ->orWhere('inci', 'like', '%'.$term.'%');
            })
            ->orderBy('name')
            ->limit(30)
            ->get(['id', 'name', 'inci', 'density']);

        $results = $rows->map(function (Ingredient $i) {
            $text = $i->name;
            if ($i->inci) {
                $text .= ' ('.$i->inci.')';
            }

            // AP-42: Dichte mitliefern, damit die Maske die ml-Erfassung anbieten kann.
            return ['id' => $i->id, 'text' => $text, 'density' => $i->density !== null ? (float) $i->density : null];
        })->values()->all();

        return response()->json(['results' => $results]);
    }

    public function searchPackagingItems(Request $request): JsonResponse
    {
        $term = trim((string) $request->query('q', ''));
        $entryType = $request->query('entry_type');

        $categoryMap = [
            'packaging' => 'packaging',
            'shipping' => 'shipping',
        ];

        $query = PackagingItem::query()
            ->where('active', true);

        if ($entryType && isset($categoryMap[$entryType])) {
            $query->where('category', $categoryMap[$entryType]);
        }

        if (mb_strlen($term) >= 1) {
            $query->where('name', 'like', '%'.$term.'%');
        }

        $rows = $query->orderBy('name')->limit(30)->get(['id', 'name']);

        $results = $rows->map(fn (PackagingItem $p) => [
            'id' => $p->id,
            'text' => $p->name,
        ])->values()->all();

        return response()->json(['results' => $results]);
    }

    /**
     * @return array<string, mixed>
     */
    protected function formSharedData(): array
    {
        return [
            'suppliers' => Supplier::query()->where('active', true)->orderBy('name')->get(),
            'locations' => Location::query()->where('active', true)->orderBy('name')->get(),
            'materialQualities' => MaterialQuality::query()->orderBy('pos')->orderBy('name')->get(),
            'taxRates' => TaxRate::query()->active()->orderBy('pos')->orderBy('name')->get(),
            'entryTypeLabels' => [
                'ingredient' => __('Rohstoff'),
                'packaging' => __('Produktverpackung'),
                'shipping' => __('Versandverpackung'),
            ],
        ];
    }
}