<?php

namespace App\Http\Controllers;

use App\Enums\PurchasingRole;
use App\Models\StockItem;
use App\Models\StockMovement;
use App\Models\Warehouse;
use App\Services\RequisitionWorkflow;
use Brick\Math\BigDecimal;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;
use Illuminate\Validation\Rule;
use Inertia\Inertia;
use Inertia\Response;

class StockController extends Controller
{
    private function access(Request $request, bool $manage = false): void
    {
        $roles = $manage ? [PurchasingRole::Admin, PurchasingRole::Warehouse] : [PurchasingRole::Admin, PurchasingRole::Warehouse, PurchasingRole::Procurement, PurchasingRole::Finance];
        abort_unless(in_array($request->user()->purchasing_role, $roles), 403);
    }

    public function index(Request $request): Response
    {
        $this->access($request);
        $filters = $request->validate([
            'search' => 'nullable|string|max:100',
            'warehouse_id' => ['nullable', 'integer', Rule::exists('warehouses', 'id')->where('tenant_id', $request->user()->tenant_id)],
        ]);
        $items = StockItem::query()->orderBy('code')->get(['id', 'code', 'name', 'unit']);
        $warehouses = Warehouse::query()->orderBy('code')->get(['id', 'code', 'name']);
        $selected = StockItem::query();
        if (! empty($filters['search'])) {
            $selected->where(fn ($q) => $q->where('code', 'like', '%'.$filters['search'].'%')->orWhere('name', 'like', '%'.$filters['search'].'%'));
        }
        $movements = StockMovement::query()->whereIn('stock_item_id', $selected->select('id'));
        if (! empty($filters['warehouse_id'])) {
            $movements->where('warehouse_id', $filters['warehouse_id']);
        }
        $balances = (clone $movements)->selectRaw('stock_item_id, warehouse_id, SUM(quantity_milli) as quantity_milli')->groupBy('stock_item_id', 'warehouse_id')->get()->map(fn ($balance) => [
            'stock_item_id' => $balance->stock_item_id, 'warehouse_id' => $balance->warehouse_id,
            'quantity_milli' => BigDecimal::of($balance->quantity_milli)->toInt(),
        ]);

        return Inertia::render('stock/index', [
            'items' => $items, 'warehouses' => $warehouses, 'balances' => $balances,
            'movements' => $movements->latest('id')->paginate(20)->withQueryString(), 'filters' => $filters,
            'canManage' => in_array($request->user()->purchasing_role, [PurchasingRole::Admin, PurchasingRole::Warehouse]),
        ]);
    }

    public function item(Request $request, RequisitionWorkflow $audit): RedirectResponse
    {
        $this->access($request, true);
        $request->merge(['code' => Str::upper(trim($request->string('code')->toString())), 'unit' => Str::lower(trim($request->string('unit')->toString()))]);
        $data = $request->validate([
            'code' => ['required', 'regex:/^[A-Z0-9][A-Z0-9._-]{0,29}$/', Rule::unique('stock_items')->where('tenant_id', $request->user()->tenant_id)],
            'name' => 'required|string|max:200', 'unit' => 'required|string|max:30',
        ]);
        DB::transaction(function () use ($request, $audit, $data) {
            $item = StockItem::query()->create([...$data, 'tenant_id' => $request->user()->tenant_id, 'created_by' => $request->user()->id]);
            $audit->audit($request->user(), 'stock.item_created', null, null, $item->toArray());
        });

        return back();
    }

    public function warehouse(Request $request, RequisitionWorkflow $audit): RedirectResponse
    {
        $this->access($request, true);
        $request->merge(['code' => Str::upper(trim($request->string('code')->toString()))]);
        $data = $request->validate([
            'code' => ['required', 'regex:/^[A-Z0-9][A-Z0-9._-]{0,29}$/', Rule::unique('warehouses')->where('tenant_id', $request->user()->tenant_id)],
            'name' => 'required|string|max:200',
        ]);
        DB::transaction(function () use ($request, $audit, $data) {
            $warehouse = Warehouse::query()->create([...$data, 'tenant_id' => $request->user()->tenant_id, 'created_by' => $request->user()->id]);
            $audit->audit($request->user(), 'stock.warehouse_created', null, null, $warehouse->toArray());
        });

        return back();
    }
}