<?php

namespace App\Http\Controllers\Api;

use App\Events\CheckoutableCheckedOut;
use App\Helpers\Helper;
use App\Http\Controllers\Controller;
use App\Http\Requests\AccessoryCheckoutRequest;
use App\Http\Requests\AdjustQuantityRequest;
use App\Http\Requests\ImageUploadRequest;
use App\Http\Requests\StoreAccessoryRequest;
use App\Http\Traits\CheckInOutTrait;
use App\Http\Traits\HandlesAdjustQuantity;
use App\Http\Transformers\AccessoriesTransformer;
use App\Http\Transformers\ActionlogsTransformer;
use App\Http\Transformers\SelectlistTransformer;
use App\Models\Accessory;
use App\Models\AccessoryCheckout;
use App\Models\Company;
use App\Models\Setting;
use App\Models\User;
use Carbon\Carbon;
use DomainException;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\Support\Facades\DB;

class AccessoriesController extends Controller
{
    use CheckInOutTrait;
    use HandlesAdjustQuantity;

    /**
     * Display a listing of the resource.
     *
     * @author [A. Gianotto] [<snipe@snipe.net>]
     *
     * @since [v4.0]
     *
     * @return Response
     */
    public function index(Request $request)
    {
        if ($request->user()->cannot('reports.view')) {
            $this->authorize('view', Accessory::class);
        }

        // This array is what determines which fields should be allowed to be sorted on ON the table itself, no relations
        // Relations will be handled in query scopes a little further down.
        $allowed_columns =
            [
                'id',
                'name',
                'model_number',
                'eol',
                'notes',
                'purchase_cost',
                'purchase_date',
                'created_at',
                'updated_at',
                'min_amt',
                'company_id',
                'notes',
                'checkouts_count',
                'image',
                'qty',
                // These are *relationships* so we wouldn't normally include them in this array,
                // since they would normally create a `column not found` error,
                // BUT we account for them in the ordering switch down at the end of this method
                // DO NOT ADD ANYTHING TO THIS LIST WITHOUT CHECKING THE ORDERING SWITCH BELOW!
                'company',
                'location',
                'category',
                'supplier',
                'manufacturer',
            ];

        // See ComponentsController for the orderItems.order.supplier eager-load rationale.
        $accessories = Accessory::select('accessories.*')
            ->with('category', 'company', 'manufacturer', 'checkouts', 'location', 'defaultSupplier', 'adminuser', 'orderItems.order.supplier')
            ->withCount('checkouts as checkouts_count');

        // This invokes the Searchable model trait scopeTextSearch and will handle input by search or by advanced search filter
        if ($request->filled('filter') || $request->filled('search')) {
            $accessories->TextSearch($request->input('filter') ? $request->input('filter') : $request->input('search'));
        }

        if ($request->filled('company_id')) {
            // expand_company_hierarchy=1 opts the company show-page tabs into the
            // parent/child rollup so a child shows items inherited from its parent.
            if ($request->boolean('expand_company_hierarchy')) {
                $accessories->whereIn('accessories.company_id', Company::reachableCompanyIds($request->input('company_id')));
            } else {
                $accessories->where('accessories.company_id', '=', $request->input('company_id'));
            }
        }

        if ($request->filled('order_number')) {
            // Reroute through the HasOrders orders() HasManyThrough since
            // the parent accessories.order_number column no longer exists.
            $orderNumber = $request->input('order_number');
            $accessories->whereHas('orders', function ($query) use ($orderNumber) {
                $query->where('orders.order_number', '=', $orderNumber);
            });
        }

        if ($request->filled('category_id')) {
            $accessories->where('accessories.category_id', '=', $request->input('category_id'));
        }

        if ($request->filled('manufacturer_id')) {
            $accessories->where('accessories.manufacturer_id', '=', $request->input('manufacturer_id'));
        }

        if ($request->filled('supplier_id')) {
            $accessories->where('accessories.default_supplier_id', '=', $request->input('supplier_id'));
        }

        if ($request->filled('location_id')) {
            $accessories->where('accessories.location_id', '=', $request->input('location_id'));
        }

        if ($request->filled('notes')) {
            $accessories->where('accessories.notes', '=', $request->input('notes'));
        }

        // Make sure the offset and limit are actually integers and do not exceed system limits
        $total = $accessories->count();
        $offset = ($request->input('offset') > $total) ? $total : app('api_offset_value');
        $limit = app('api_limit_value');

        $order = $request->input('order') === 'asc' ? 'asc' : 'desc';
        $sort_override = $request->input('sort');
        $column_sort = in_array($sort_override, $allowed_columns) ? $sort_override : 'created_at';

        switch ($sort_override) {
            case 'category':
                $accessories = $accessories->OrderCategory($order);
                break;
            case 'company':
                $accessories = $accessories->OrderCompany($order);
                break;
            case 'location':
                $accessories = $accessories->OrderLocation($order);
                break;
            case 'manufacturer':
                $accessories = $accessories->OrderManufacturer($order);
                break;
            case 'supplier':
                $accessories = $accessories->OrderSupplier($order);
                break;
            case 'created_by':
                $accessories = $accessories->OrderByCreatedByName($order);
                break;
            case 'purchase_cost':
                // purchase_cost lives on order_items now; sort by the
                // last acquisition's price rather than the removed
                // parent column.
                $accessories = $accessories->OrderByLastPurchaseCost($order);
                break;
            case 'purchase_date':
                $accessories = $accessories->OrderByLastPurchaseDate($order);
                break;
            case 'total_cost':
                // total_cost is the sum of qty*price across every
                // OrderItem, mirroring the info-panel's total_cost
                // display so the column header sort matches.
                $accessories = $accessories->OrderByTotalOrderCost($order);
                break;
            case 'percent_remaining':
                $accessories = $accessories->OrderPercentRemaining($order);
                break;
            default:
                $accessories = $accessories->orderBy($column_sort, $order);
                break;
        }

        $accessories = $accessories->skip($offset)->take($limit)->get();

        return (new AccessoriesTransformer)->transformAccessories($accessories, $total);
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  ImageUploadRequest  $request
     * @return JsonResponse
     *
     * @author [A. Gianotto] [<snipe@snipe.net>]
     *
     * @since [v4.0]
     */
    public function store(StoreAccessoryRequest $request)
    {
        $accessory = new Accessory;
        $accessory->fill($request->all());
        $accessory->company_id = Company::getIdForCurrentUser($request->input('company_id'));
        // Seed the parent's "typical supplier" template from the initial
        // acquisition supplier on create; editable afterwards. See the
        // UI store method for the parent-as-template rationale.
        if (! $request->filled('default_supplier_id') && $request->filled('supplier_id')) {
            $accessory->default_supplier_id = $request->input('supplier_id');
        }
        $accessory = $request->handleImages($accessory);

        if ($accessory->save()) {
            $this->enrichInitialOrderFromRequest($request, $accessory);

            return response()->json(Helper::formatStandardApiResponse('success', $accessory, trans('admin/accessories/message.create.success')));
        }

        return response()->json(Helper::formatStandardApiResponse('error', null, $accessory->getErrors()));

    }

    /**
     * Display the specified resource.
     *
     * @param  int  $id
     * @return array
     *
     * @author [A. Gianotto] [<snipe@snipe.net>]
     *
     * @since [v4.0]
     */
    public function show($id)
    {
        $this->authorize('view', Accessory::class);
        $accessory = Accessory::withCount('checkouts as checkouts_count')->findOrFail($id);

        return (new AccessoriesTransformer)->transformAccessory($accessory);
    }

    /**
     * Display the specified resource.
     *
     * @param  int  $id
     * @return array
     *
     * @author [A. Gianotto] [<snipe@snipe.net>]
     *
     * @since [v4.0]
     */
    public function accessory_detail($id)
    {
        $this->authorize('view', Accessory::class);
        $accessory = Accessory::findOrFail($id);

        return (new AccessoriesTransformer)->transformAccessory($accessory);
    }

    /**
     * Get the list of checkouts for a specific accessory
     *
     * @author [A. Gianotto] [<snipe@snipe.net>]
     *
     * @since [v4.0]
     *
     * @param  int  $id
     * @return | array
     */
    public function checkedout(Request $request, $id)
    {
        $this->authorize('view', Accessory::class);

        $accessory = Accessory::with('lastCheckout')->findOrFail($id);
        $offset = request('offset', 0);
        $limit = request('limit', 50);

        // Total count of all checkouts for this asset
        $accessory_checkouts = $accessory->checkouts();

        // Check for search text in the request
        if ($request->filled('search')) {
            $accessory_checkouts = $accessory_checkouts->TextSearch($request->input('search'));
        }

        $total = $accessory_checkouts->count();
        $accessory_checkouts = $accessory_checkouts->skip($offset)->take($limit)->get();

        $accessory_checkouts->loadMorph('assignedTo', [
            User::class => ['companies'],
        ]);

        return (new AccessoriesTransformer)->transformCheckedoutAccessory($accessory_checkouts, $total);
    }

    /**
     * Update the specified resource in storage.
     *
     * @author [A. Gianotto] [<snipe@snipe.net>]
     *
     * @since [v4.0]
     *
     * @param  int  $id
     * @return JsonResponse
     */
    public function update(ImageUploadRequest $request, $id)
    {
        $this->authorize('update', Accessory::class);
        $accessory = Accessory::findOrFail($id);

        // Payload shape is preserved for API back-compat: `qty`,
        // `order_number`, and `supplier_id` all remain accepted keys.
        // supplier_id flows through fill() like any other field. `qty` gets
        // pulled off the fill and routed through adjustQuantity() below so
        // any change writes a QuantityAdjust action_log entry rather than
        // silently overwriting. `order_number` no longer lives on the
        // parent — resolveOrderForAdjustment turns it into an Order +
        // OrderItem pair and passes the Order's id to the trait.
        $qtyBefore = (int) $accessory->qty;
        $qtyRequested = $request->has('qty') ? (int) $request->input('qty') : $qtyBefore;
        $qtyDelta = $qtyRequested - $qtyBefore;

        // supplier_id, purchase_date, purchase_cost, and order_number
        // are create-only on the parent. Post-create acquisitions live
        // as Orders + OrderItems (each with its own supplier / date /
        // price / order number), so update-mode drops all four. API
        // consumers relying on the old "set these via PATCH" behavior
        // need to use the adjust-quantity endpoint instead.
        $accessory->fill($request->except([
            'qty',
            'order_number',
            'purchase_cost',
            'purchase_date',
            'supplier_id',
        ]));
        $accessory->company_id = Company::getIdForCurrentUser($request->input('company_id'));
        $accessory = $request->handleImages($accessory);

        if (! $accessory->save()) {
            return response()->json(Helper::formatStandardApiResponse('error', null, $accessory->getErrors()));
        }

        if ($qtyDelta !== 0) {
            $orderId = $this->resolveOrderForAdjustment($request, $accessory, $qtyDelta);
            try {
                $accessory->adjustQuantity(
                    $qtyDelta,
                    $request->input('note') ?: "API qty change: {$qtyBefore} → {$qtyRequested}",
                    $orderId,
                );
            } catch (DomainException) {
                return response()->json(
                    Helper::formatStandardApiResponse('error', null, trans('general.adjust_quantity_below_zero')),
                    422,
                );
            }
        }

        return response()->json(Helper::formatStandardApiResponse('success', $accessory, trans('admin/accessories/message.update.success')));
    }

    /**
     * Dedicated adjust-quantity endpoint. Signed delta semantics: positive
     * amount replenishes, negative decrements. Every call becomes a
     * QuantityAdjust action_log entry. Note is required (unlike the
     * general update path which synthesizes one). An optional file
     * attachment lands on the same log row via UploadFileRequest::handleFile.
     * See Api\AccessoriesController::update for the "qty inside PATCH"
     * alternative preserved for API back-compat.
     */
    public function adjustQuantity(AdjustQuantityRequest $request, Accessory $accessory): JsonResponse
    {
        return $this->adjustQuantityAsJson($request, $accessory);
    }

    /**
     * Remove the specified resource from storage.
     *
     * @author [A. Gianotto] [<snipe@snipe.net>]
     *
     * @since [v4.0]
     *
     * @param  int  $id
     * @return JsonResponse
     */
    public function destroy($id)
    {
        $this->authorize('delete', Accessory::class);
        $accessory = Accessory::withCount('checkouts as checkouts_count')->findOrFail($id);
        $this->authorize($accessory);

        if ($accessory->checkouts_count > 0) {
            return response()->json(Helper::formatStandardApiResponse('error', null, trans('admin/accessories/general.delete_disabled')));
        }

        $accessory->delete();

        return response()->json(Helper::formatStandardApiResponse('success', null, trans('admin/accessories/message.delete.success')));
    }

    /**
     * Save the Accessory checkout information.
     *
     * If Slack is enabled and/or asset acceptance is enabled, it will also
     * trigger a Slack message and send an email.
     *
     * @param  int  $accessoryId
     * @return JsonResponse
     *
     * @author [A. Gianotto] [<snipe@snipe.net>]
     */
    public function checkout(AccessoryCheckoutRequest $request, Accessory $accessory)
    {
        $this->authorize('checkout', $accessory);
        $target = $this->determineCheckoutTarget();

        if ((Setting::getSettings()->full_multiple_companies_support == '1') && (! $target->companies()->where('companies.id', $accessory->company_id)->exists())) {
            return response()->json(Helper::formatStandardApiResponse('error', null, trans('general.error_user_company')));
        }

        $accessory->checkout_qty = $request->input('checkout_qty', 1);
        $payload = null;
        $overAllocated = false;

        // Concurrency guard. AccessoryCheckoutRequest validated
        // number_remaining_after_checkout >= 0 with an unlocked read of
        // numRemaining(), so two simultaneous checkout requests could both
        // pass validation, both attach rows, and land the register at -1.
        // Re-fetch the parent row under lockForUpdate INSIDE the
        // transaction, re-check availability against the locked snapshot,
        // and only then write. Mirrors the License checkout locking
        // pattern.
        DB::transaction(function () use ($accessory, $request, $target, &$payload, &$overAllocated): void {
            $locked = Accessory::whereKey($accessory->id)->lockForUpdate()->first();

            if (! $locked || $locked->numRemaining() < $accessory->checkout_qty) {
                $overAllocated = true;

                return;
            }

            for ($i = 0; $i < $accessory->checkout_qty; $i++) {

                $accessory_checkout = new AccessoryCheckout([
                    'accessory_id' => $accessory->id,
                    'created_at' => Carbon::now(),
                    'assigned_to' => $target->id,
                    'assigned_type' => $target::class,
                    'note' => $request->input('note'),
                ]);

                $accessory_checkout->created_by = auth()->id();
                $accessory_checkout->save();

                $payload = [
                    'accessory_id' => $accessory->id,
                    'assigned_to' => $target->id,
                    'assigned_type' => $target::class,
                    'note' => $request->input('note'),
                    'created_by' => auth()->id(),
                    'pivot' => $accessory_checkout->id,
                ];
            }

            // Set this value to be able to pass the qty through to the event.
            event(new CheckoutableCheckedOut(
                $accessory,
                $target,
                auth()->user(),
                $request->input('note'),
                [],
                $accessory->checkout_qty,
            ));
        });

        if ($overAllocated) {
            return response()->json(Helper::formatStandardApiResponse('error', null, trans('admin/accessories/message.checkout.unavailable')));
        }

        return response()->json(Helper::formatStandardApiResponse('success', $payload, trans('admin/accessories/message.checkout.success')));

    }

    /**
     * Check in the item so that it can be checked out again to someone else
     *
     * @param  int  $accessoryUserId
     * @param  string  $backto
     * @return JsonResponse
     *
     * @uses Accessory::checkin_email() to determine if an email can and should be sent
     *
     * @author [A. Gianotto] [<snipe@snipe.net>]
     *
     * @internal param int $accessoryId
     */
    public function checkin(Request $request, $accessoryUserId = null)
    {
        if (is_null($accessory_checkout = AccessoryCheckout::find($accessoryUserId))) {
            return response()->json(Helper::formatStandardApiResponse('error', null, trans('admin/accessories/message.does_not_exist', ['id' => $accessoryUserId])));
        }

        $accessory = Accessory::find($accessory_checkout->accessory_id);
        $this->authorize('checkin', $accessory);

        $accessory->logCheckin(User::find($accessory_checkout->assigned_to), $request->input('note'));

        // Was the accessory updated?
        if ($accessory_checkout->delete()) {
            if (! is_null($accessory_checkout->assigned_to)) {
                $user = User::find($accessory_checkout->assigned_to);
            }

            $payload = [
                'accessory_id' => $accessory->id,
                'note' => $request->input('note'),
                'created_by' => auth()->id(),
                'pivot' => $accessory_checkout->id,
            ];

            return response()->json(Helper::formatStandardApiResponse('success', $payload, trans('admin/accessories/message.checkin.success')));
        }

        return response()->json(Helper::formatStandardApiResponse('error', null, trans('admin/accessories/message.checkin.error')));

    }

    /**
     * Gets a paginated collection for the select2 menus
     *
     * @see SelectlistTransformer
     */
    public function selectlist(Request $request)
    {
        $this->authorize('view.selectlists');

        $accessories = Accessory::select([
            'accessories.id',
            'accessories.name',
        ]);

        if ($request->filled('search')) {
            $accessories = $accessories->where('accessories.name', 'LIKE', '%'.$request->input('search').'%');
        }

        $accessories = $accessories->orderBy('name', 'ASC')->paginate(50);

        return (new SelectlistTransformer)->transformSelectlist($accessories);
    }

    public function history(Request $request, Accessory $accessory): JsonResponse|array
    {
        $this->authorize('history', $accessory);
        $historyQuery = $accessory->getHistory($request);
        $total = (clone $historyQuery)->count();
        $offset = ($request->input('offset') > $total) ? $total : app('api_offset_value');
        $limit = app('api_limit_value');
        $history = (clone $historyQuery)->skip($offset)->take($limit)->get();

        return response()->json((new ActionlogsTransformer)->transformActionlogs($history, $total), 200, ['Content-Type' => 'application/json;charset=utf8'], JSON_UNESCAPED_UNICODE);
    }
}
