<?php

namespace App\Http\Controllers;

use App\Enums\PurchasingRole;
use App\Models\Equipment;
use App\Models\StockItem;
use App\Models\StockOperation;
use App\Models\User;
use App\Models\Warehouse;
use App\Services\InventoryCounts;
use App\Services\InventoryLots;
use App\Services\InventoryReversals;
use App\Services\StockWorkflow;
use Brick\Math\BigDecimal;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Str;
use Illuminate\Validation\Rule;
use Illuminate\Validation\ValidationException;
use Inertia\Inertia;
use Inertia\Response;

class StockOperationController extends Controller
{
    public function index(Request $request, StockWorkflow $workflow): Response
    {
        $actor = $request->user('web');
        abort_unless($actor instanceof User, 403);
        abort_unless($actor->hasFunctions([PurchasingRole::Warehouse, PurchasingRole::Admin, PurchasingRole::Finance, PurchasingRole::Procurement, 'inventory_adjust_review']), 403);
        $items = StockItem::query()->orderBy('code')->get(['id', 'code', 'name', 'unit']);
        $warehouses = Warehouse::query()->orderBy('code')->get(['id', 'code', 'name']);
        $balances = [];
        $lotCounts = [];
        foreach ($items as $item) {
            foreach ($warehouses as $warehouse) {
                $balances[] = ['stock_item_id' => $item->id, 'warehouse_id' => $warehouse->id, ...$workflow->balance($item->id, $warehouse->id),
                    'lot_control' => app(InventoryLots::class)->summary($item->id, $warehouse->id)];
                if ($actor->hasFunctions([PurchasingRole::Warehouse]) && app(InventoryLots::class)->setup($item->id, $warehouse->id) !== null) {
                    try {
                        $source = app(InventoryCounts::class)->source($item->id, $warehouse->id);
                        $lotCounts[] = ['stock_item_id' => $item->id, 'warehouse_id' => $warehouse->id, ...$source];
                    } catch (ValidationException) {
                        // The summary still reports the divergence; no count can use an invented baseline.
                    }
                }
            }
        }

        return Inertia::render('stock/operations', [
            'canViewReturns' => config('stock_returns.enabled') && $actor->hasFunctions(['warehouse_return_read']) && ! app(\App\Services\OrganizationAccess::class)->maintenanceOnly($actor),
            'correctedOperations' => collect(app(InventoryReversals::class)->corrections('operation'))->map(fn ($r) => $r->data['reference']),
            'items' => $items, 'warehouses' => $warehouses, 'balances' => $balances,
            'users' => User::query()->where('tenant_id', $actor->tenant_id)->orderBy('name')->get(['id', 'name']),
            'operations' => StockOperation::query()->latest('id')->paginate(20),
            'counts' => StockOperation::query()->where('kind', 'count')->whereNotIn('id', StockOperation::query()->whereNotNull('count_id')->select('count_id'))->latest('id')->get(),
            'canOperate' => $actor->hasFunctions([PurchasingRole::Warehouse]),
            'canAdjust' => app(InventoryLots::class)->allows($actor, 'inventory_adjust_review'), 'lotCounts' => $lotCounts,
            'equipment' => Equipment::query()->orderBy('code')->get(['id', 'code', 'description']),
        ]);
    }

    public function store(Request $request, StockWorkflow $workflow): JsonResponse|RedirectResponse
    {
        $actor = $request->user('web');
        abort_unless($actor instanceof User, 403);
        abort_unless($actor->hasFunctions($request->input('kind') === 'adjustment' ? [PurchasingRole::Warehouse, 'inventory_adjust_review'] : [PurchasingRole::Warehouse]), 403);
        $request->merge(['reference' => Str::upper(Str::squish($request->string('reference')->toString())), 'reason' => trim($request->string('reason')->toString()), 'destination' => trim($request->string('destination')->toString())]);
        $tenant = $actor->tenant_id;
        $data = $request->validate([
            'kind' => ['required', Rule::in(['issue', 'transfer', 'count', 'adjustment'])],
            'reference' => 'required|string|max:100', 'idempotency_key' => 'required|uuid', 'reason' => 'required|string|max:4000',
            'responsible_id' => ['required', 'integer', Rule::exists('users', 'id')->where('tenant_id', $tenant)],
            'warehouse_id' => ['required', 'integer', Rule::exists('warehouses', 'id')->where('tenant_id', $tenant)],
            'stock_item_id' => ['required', 'integer', Rule::exists('stock_items', 'id')->where('tenant_id', $tenant)],
            'destination_warehouse_id' => ['exclude_unless:kind,transfer', 'required', 'integer', Rule::exists('warehouses', 'id')->where('tenant_id', $tenant)],
            'destination' => 'exclude_unless:kind,issue|required|string|max:200',
            'equipment_id' => ['exclude_unless:kind,issue', 'nullable', 'integer', Rule::exists('equipment', 'id')->where('tenant_id', $tenant)],
            'quantity' => ['exclude_if:kind,adjustment', 'required', 'regex:/^\d{1,9}(\.\d{1,3})?$/', $request->input('kind') === 'count' ? 'gte:0' : 'gt:0'],
            'ledger_version' => 'exclude_unless:kind,count|required|integer|min:0',
            'count_id' => ['exclude_unless:kind,adjustment', 'required', 'integer', Rule::exists('stock_operations', 'id')->where('tenant_id', $tenant)->where('kind', 'count')],
            'lot_version' => 'exclude_unless:kind,count|nullable|string|size:64',
            'lot_counts' => 'exclude_unless:kind,count|sometimes|array|max:500',
            'lot_counts.*.lot_id' => 'nullable|integer|min:1', 'lot_counts.*.new_key' => 'nullable|uuid',
            'lot_counts.*.quantity' => ['required', 'string', 'regex:/^\d{1,9}(\.\d{1,3})?$/'],
            'lot_counts.*.code' => 'nullable|string|max:100', 'lot_counts.*.expires_on' => 'nullable|date_format:Y-m-d', 'lot_counts.*.no_expiry' => 'sometimes|boolean',
        ]);
        if (empty($data['equipment_id'])) {
            unset($data['equipment_id']);
        }
        if (empty($data['lot_version'])) {
            unset($data['lot_version']);
        }
        if (empty($data['lot_counts']) && empty($data['lot_version'])) {
            unset($data['lot_counts']);
        }
        if (isset($data['lot_counts'])) {
            $data['lot_counts'] = array_map(function (array $row) {
                if (! empty($row['lot_id'])) {
                    $row['lot_id'] = (int) $row['lot_id'];
                }
                $row['quantity'] = (string) BigDecimal::of($row['quantity'])->toScale(3);

                return $row;
            }, $data['lot_counts']);
        }
        foreach (['responsible_id', 'warehouse_id', 'stock_item_id', 'destination_warehouse_id', 'ledger_version', 'count_id', 'equipment_id'] as $key) {
            if (isset($data[$key])) {
                $data[$key] = (int) $data[$key];
            }
        }
        $data['quantity'] = isset($data['quantity']) ? (string) BigDecimal::of($data['quantity'])->toScale(3) : '0.000';
        ksort($data);
        $operation = $workflow->record($actor, $data);

        return $request->expectsJson() ? response()->json(['id' => $operation->id, 'created' => $operation->wasRecentlyCreated], $operation->wasRecentlyCreated ? 201 : 200) : back();
    }
}