<?php

namespace App\Http\Controllers\Public;

use App\Http\Controllers\Controller;
use App\Models\PosLocation;
use App\Models\PosProduct;
use App\Models\PosSale;
use App\Models\PosTable;
use App\Models\User;
use App\Services\Pos\PosSaleService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\View\View;

/**
 * Public table-QR ordering: a guest scans a table's QR, browses the menu, and
 * submits an order that lands on that table's open tab and fires to the kitchen.
 * No auth — scoped entirely by the table's unguessable short_code.
 */
class TableOrderController extends Controller
{
    public function __construct(private PosSaleService $sales) {}

    public function menu(string $code): View
    {
        $table = PosTable::where('short_code', $code)->firstOrFail();
        $owner = (string) $table->owner_ref;
        $location = PosLocation::owned($owner)->first();

        $products = PosProduct::owned($owner)->active()
            ->with(['category', 'modifierGroups.modifiers'])
            ->orderBy('name')->get();

        return view('public.table-menu', [
            'table' => $table,
            'storeName' => $location?->name ?: 'Menu',
            'currency' => $location?->currency ?: config('pos.default_currency', 'GHS'),
            'products' => $products->map(fn (PosProduct $p) => [
                'id' => $p->id,
                'name' => $p->name,
                'price_minor' => $p->price_minor,
                'category' => $p->category?->name,
                'modifier_groups' => $p->modifierGroups->map(fn ($g) => [
                    'id' => $g->id, 'name' => $g->name, 'min' => $g->min_select, 'max' => $g->max_select,
                    'modifiers' => $g->modifiers->map(fn ($m) => [
                        'id' => $m->id, 'name' => $m->name, 'price_delta_minor' => $m->price_delta_minor,
                    ])->values()->all(),
                ])->values()->all(),
            ])->values()->all(),
        ]);
    }

    public function store(Request $request, string $code): JsonResponse
    {
        $table = PosTable::where('short_code', $code)->firstOrFail();
        $owner = (string) $table->owner_ref;

        $data = $request->validate([
            'items' => ['required', 'array', 'min:1', 'max:50'],
            'items.*.product_id' => ['required', 'integer'],
            'items.*.quantity' => ['required', 'integer', 'min:1', 'max:50'],
            'items.*.modifier_ids' => ['nullable', 'array'],
            'items.*.modifier_ids.*' => ['integer'],
            'items.*.notes' => ['nullable', 'string', 'max:200'],
            'customer_name' => ['nullable', 'string', 'max:120'],
        ]);

        $sale = $this->resolveTab($table, $owner);
        if ($sale === null) {
            return response()->json(['message' => 'This table is not available for ordering right now.'], 422);
        }

        if (! empty($data['customer_name']) && ! $sale->customer_name) {
            $sale->forceFill(['customer_name' => $data['customer_name']])->save();
        }

        $added = 0;
        foreach ($data['items'] as $item) {
            $payload = $this->sales->buildProductLine(
                $owner,
                (int) $item['product_id'],
                $item['modifier_ids'] ?? [],
                (int) $item['quantity'],
                $item['notes'] ?? null,
                null,
                'guest',
            );
            if ($payload !== null) {
                $this->sales->addLine($sale, $payload);
                $added++;
            }
        }

        if ($added === 0) {
            return response()->json(['message' => 'Those items are no longer available.'], 422);
        }

        // Guest orders go straight to the kitchen.
        $this->sales->sendToKitchen($sale);

        return response()->json(['redirect' => route('pos.table.confirmed', $code)]);
    }

    public function confirmed(string $code): View
    {
        $table = PosTable::where('short_code', $code)->firstOrFail();
        $location = PosLocation::owned((string) $table->owner_ref)->first();

        return view('public.table-confirmed', [
            'table' => $table,
            'storeName' => $location?->name ?: 'Thanks',
        ]);
    }

    private function resolveTab(PosTable $table, string $owner): ?PosSale
    {
        if ($table->current_sale_id) {
            $existing = PosSale::owned($owner)->openTickets()->find($table->current_sale_id);
            if ($existing) {
                return $existing;
            }
        }

        $merchant = User::where('public_id', $owner)->first();
        if (! $merchant) {
            return null;
        }

        $location = PosLocation::owned($owner)->first();

        return $this->sales->openTicket($merchant, [
            'order_type' => PosSale::ORDER_DINE_IN,
            'table_id' => $table->id,
            'location_id' => $location?->id,
            'currency' => $location?->currency,
        ]);
    }
}