City10/app/Http/Controllers/Web/CityMarketController.php

<?php

namespace App\Http\Controllers\Web;

use App\Http\Controllers\Controller;
use App\Models\Character;
use App\Models\InventoryItem;
use App\Models\MarketListing;
use App\Models\Mission;
use App\Models\Transaction;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

/**
 * Marketplace between citizens and mission journal endpoints.
 */
class CityMarketController extends Controller
{
    /**
     * Active listings in the caller's city plus own listings.
     */
    public function index(Request $request): JsonResponse
    {
        $me = Character::ensureForUser($request->user());

        $listings = MarketListing::query()
            ->where('city_id', $me->city_id)
            ->where('is_active', true)
            ->with('seller:id,name')
            ->orderByDesc('id')
            ->limit(50)
            ->get()
            ->map(fn (MarketListing $l): array => [
                'id' => $l->id,
                'item' => $l->item,
                'qty' => (int) $l->qty,
                'unit_price' => (float) $l->unit_price,
                'seller_id' => $l->seller_character_id,
                'seller_name' => $l->seller?->name,
                'is_mine' => (int) $l->seller_character_id === (int) $me->id,
            ]);

        $missions = Mission::query()
            ->where('city_id', $me->city_id)
            ->where('is_active', true)
            ->get()
            ->map(function (Mission $m) use ($me) {
                $pivot = DB::table('character_missions')
                    ->where('character_id', $me->id)
                    ->where('mission_id', $m->id)
                    ->first();

                return [
                    'id' => $m->id,
                    'code' => $m->code,
                    'title' => $m->title,
                    'description' => $m->description,
                    'target' => (int) $m->target,
                    'reward' => (float) $m->reward,
                    'progress' => (int) ($pivot->progress ?? 0),
                    'is_completed' => (bool) ($pivot->is_completed ?? false),
                ];
            });

        return response()->json([
            'listings' => $listings,
            'missions' => $missions,
            'money' => (float) $me->money,
            'inventory' => $me->inventory()->get()->mapWithKeys(fn ($i) => [$i->item => (int) $i->qty])->all(),
        ]);
    }

    /**
     * Publish inventory for sale.
     */
    public function sell(Request $request): JsonResponse
    {
        $me = Character::ensureForUser($request->user());
        $data = $request->validate([
            'item' => ['required', 'in:food,water,materials,product'],
            'qty' => ['required', 'integer', 'min:1', 'max:100'],
            'unit_price' => ['required', 'numeric', 'min:0.5', 'max:1000'],
        ]);

        $row = InventoryItem::query()
            ->where('character_id', $me->id)
            ->where('item', $data['item'])
            ->first();

        if ($row === null || (int) $row->qty < (int) $data['qty']) {
            return response()->json(['message' => __('city.no_inventory')], 422);
        }

        DB::transaction(function () use ($me, $data, $row): void {
            $row->qty = (int) $row->qty - (int) $data['qty'];
            $row->save();
            MarketListing::create([
                'seller_character_id' => $me->id,
                'city_id' => $me->city_id,
                'item' => $data['item'],
                'qty' => (int) $data['qty'],
                'unit_price' => (float) $data['unit_price'],
                'is_active' => true,
            ]);
        });

        return response()->json(['message' => __('city.market_listed')]);
    }

    /**
     * Purchase a listing from another citizen.
     */
    public function buy(Request $request): JsonResponse
    {
        $me = Character::ensureForUser($request->user());
        $data = $request->validate([
            'listing_id' => ['required', 'integer', 'exists:market_listings,id'],
            'qty' => ['nullable', 'integer', 'min:1', 'max:100'],
        ]);

        $listing = MarketListing::query()->findOrFail($data['listing_id']);

        if (! $listing->is_active || (int) $listing->seller_character_id === (int) $me->id) {
            return response()->json(['message' => __('city.market_unavailable')], 422);
        }

        $qty = min((int) ($data['qty'] ?? $listing->qty), (int) $listing->qty);
        $total = round($listing->unit_price * $qty, 2);

        if ((float) $me->money < $total) {
            return response()->json(['message' => __('city.no_money')], 422);
        }

        DB::transaction(function () use ($me, $listing, $qty, $total): void {
            $seller = Character::query()->lockForUpdate()->findOrFail($listing->seller_character_id);
            $me->money = round((float) $me->money - $total, 2);
            $me->save();
            $seller->money = round((float) $seller->money + $total, 2);
            $seller->save();

            $row = InventoryItem::query()
                ->where('character_id', $me->id)
                ->where('item', $listing->item)
                ->first();
            if ($row) {
                $row->qty = (int) $row->qty + $qty;
                $row->save();
            } else {
                InventoryItem::create([
                    'character_id' => $me->id,
                    'item' => $listing->item,
                    'qty' => $qty,
                ]);
            }

            $listing->qty = (int) $listing->qty - $qty;
            if ($listing->qty <= 0) {
                $listing->is_active = false;
            }
            $listing->save();

            Transaction::create([
                'from_character_id' => $me->id,
                'to_character_id' => $seller->id,
                'item' => $listing->item,
                'qty' => $qty,
                'amount' => $total,
            ]);
        });

        $me->refresh();

        return response()->json([
            'message' => __('city.market_bought'),
            'money' => (float) $me->money,
            'inventory' => $me->inventory()->get()->mapWithKeys(fn ($i) => [$i->item => (int) $i->qty])->all(),
        ]);
    }
}