<?php

namespace App\Http\Controllers;

use App\Models\InventoryTransaction;
use App\Models\Item;
use App\Models\Warehouse;
use App\Models\Project;
use App\Models\Currency;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\DB;

class InventoryTransactionController extends Controller
{
    public function index(Request $request)
    {
        $tenantId = tenant_id() ?? Auth::user()?->tenant_id;
        $query = InventoryTransaction::when($tenantId, function($q) use ($tenantId) {
            $q->where('tenant_id', $tenantId);
        })->with(['item', 'warehouse', 'project', 'currency', 'createdBy']);

        if ($request->filled('type')) {
            $query->where('type', $request->type);
        }

        if ($request->filled('item_id')) {
            $query->where('item_id', $request->item_id);
        }

        if ($request->filled('warehouse_id')) {
            $query->where('warehouse_id', $request->warehouse_id);
        }

        if ($request->filled('project_id')) {
            $query->where('project_id', $request->project_id);
        }

        if ($request->filled('from_date')) {
            $query->where('date', '>=', $request->from_date);
        }

        if ($request->filled('to_date')) {
            $query->where('date', '<=', $request->to_date);
        }

        $transactions = $query->orderBy('date', 'desc')->orderBy('created_at', 'desc')->paginate(20)->appends($request->query());

         $items = Item::when($tenantId, function($q) use ($tenantId) {
            $q->where('tenant_id', $tenantId);
        })->orderBy('name')->get();

        $warehouses = Warehouse::when($tenantId, function($q) use ($tenantId) {
            $q->where('tenant_id', $tenantId);
        })->where('is_active', true)->orderBy('name')->get();

        $projects = Project::when($tenantId, function($q) use ($tenantId) {
            $q->where('tenant_id', $tenantId);
        })->whereIn('status', ['planning', 'in_progress'])->get();

        $types = ['in', 'out', 'return', 'adjustment'];

        return view('inventory-transactions.index', compact('transactions', 'items', 'warehouses', 'projects', 'types'));
    }

    public function create()
    {
        $tenantId = tenant_id() ?? Auth::user()?->tenant_id;
         $warehouses = Warehouse::when($tenantId, function($q) use ($tenantId) {
            $q->where('tenant_id', $tenantId);
        })->orderBy('name')->get();

        $warehouses = Warehouse::when($tenantId, function($q) use ($tenantId) {
            $q->where('tenant_id', $tenantId);
        })->where('is_active', true)->orderBy('name')->get();

        $projects = Project::when($tenantId, function($q) use ($tenantId) {
            $q->where('tenant_id', $tenantId);
        })->whereIn('status', ['planning', 'in_progress'])->get();

        $currencies = Currency::all();
        $types = ['in' => 'in', 'out' => 'out', 'return' => 'return', 'adjustment' => 'adjustment'];

        return view('inventory-transactions.form', compact('items', 'warehouses', 'projects', 'currencies', 'types'));
    }

    public function store(Request $request)
    {
        $tenantId = tenant_id() ?? Auth::user()?->tenant_id;

        $validated = $request->validate([
            'type' => 'required|in:in,out,return,adjustment',
            'item_id' => 'required|exists:items,id',
            'warehouse_id' => 'required|exists:warehouses,id',
            'project_id' => 'nullable|exists:projects,id',
            'quantity' => 'required|numeric|min:0.01',
            'unit_price' => 'nullable|numeric|min:0',
            'currency_id' => 'nullable|exists:currencies,id',
            'date' => 'required|date',
            'reference' => 'nullable|string|max:100',
            'description' => 'nullable|string',
        ]);

        // بررسی موجودی برای خروج
        if ($validated['type'] === 'out') {
            $currentStock = $this->getCurrentStock($validated['item_id'], $validated['warehouse_id']);
            if ($currentStock < $validated['quantity']) {
                return back()->withErrors(['quantity' => __('inventory.insufficient_stock')])
                    ->withInput();
            }
        }

        $validated['tenant_id'] = $tenantId;
        $validated['created_by'] = Auth::id();

        if (!empty($validated['unit_price']) && !empty($validated['quantity'])) {
            $validated['total_price'] = $validated['unit_price'] * $validated['quantity'];
        }

        InventoryTransaction::create($validated);

        return redirect()
            ->route('inventory-transactions.index')
            ->with('success', __('inventory.transaction_created_successfully'));
    }

    public function show(InventoryTransaction $inventoryTransaction)
    {
        $inventoryTransaction->load(['item', 'warehouse', 'project', 'currency', 'createdBy']);

        return view('inventory-transactions.show', compact('inventoryTransaction'));
    }

    public function destroy(InventoryTransaction $inventoryTransaction)
    {
        $inventoryTransaction->delete();

        return redirect()
            ->route('inventory-transactions.index')
            ->with('success', __('inventory.transaction_deleted_successfully'));
    }

    public function currentStock(Request $request)
    {
        $request->validate([
            'item_id' => 'required|exists:items,id',
            'warehouse_id' => 'required|exists:warehouses,id',
        ]);

        $stock = $this->getCurrentStock($request->item_id, $request->warehouse_id);

        return response()->json([
            'current_stock' => $stock,
        ]);
    }

    private function getCurrentStock(int $itemId, int $warehouseId): float
    {
        $totalIn = InventoryTransaction::where('item_id', $itemId)
            ->where('warehouse_id', $warehouseId)
            ->whereIn('type', ['in', 'return'])
            ->sum('quantity');

        $totalOut = InventoryTransaction::where('item_id', $itemId)
            ->where('warehouse_id', $warehouseId)
            ->where('type', 'out')
            ->sum('quantity');

        $adjustments = InventoryTransaction::where('item_id', $itemId)
            ->where('warehouse_id', $warehouseId)
            ->where('type', 'adjustment')
            ->sum('quantity');

        return (float) ($totalIn - $totalOut + $adjustments);
    }
}