<?php

namespace App\Http\Controllers;

use App\Http\Requests\StoreExpenseRequest;
use App\Models\Expense;
use App\Models\Project;
use App\Models\Currency;
use App\Helpers\CurrencyHelper;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class ExpenseController extends Controller
{
    /**
     * Display a listing of expenses with filters.
     */
    public function index(Request $request)
    {
        $this->authorize('viewAny', Expense::class);

        $query = Expense::with(['project', 'currency', 'requestedBy', 'approvedBy']);

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

        // Filter by category
        if ($request->filled('category')) {
            $query->byCategory($request->category);
        }

        // Filter by status
        if ($request->filled('status')) {
            $query->byStatus($request->status);
        }

        // Filter by date range
        if ($request->filled('from_date')) {
            $query->where('expense_date', '>=', $request->from_date);
        }
        if ($request->filled('to_date')) {
            $query->where('expense_date', '<=', $request->to_date);
        }

        $query->orderBy('expense_date', 'desc');

        $expenses = $query->paginate(20)->appends($request->query());

        $projects = Project::whereIn('status', ['planning', 'active'])->get();
        $categories = ['materials', 'labor', 'equipment', 'transport', 'services', 'food', 'accommodation', 'other'];
        $statuses = ['pending', 'approved', 'rejected', 'paid'];

        return view('expenses.index', compact('expenses', 'projects', 'categories', 'statuses'));
    }

    /**
     * Show the form for creating a new expense (multi-currency aware).
     */
    public function create()
    {
        $this->authorize('create', Expense::class);

        $expense = null;  // ← این خط اضافه بشه
        $projects = Project::whereIn('status', ['planning', 'active'])->get();
        $currencies = Currency::where('is_active', true)->get();
        $categories = ['materials', 'labor', 'equipment', 'transport', 'services', 'food', 'accommodation', 'other'];
        $baseCurrency = CurrencyHelper::getBaseCurrency();

        return view('expenses.form', compact('expense', 'projects', 'currencies', 'categories', 'baseCurrency'));
    }

    /**
     * Store a newly created expense in storage.
     */
    public function store(StoreExpenseRequest $request)
    {
        $this->authorize('create', Expense::class);

        $data = $request->validated();
        $data['tenant_id'] = $this->getTenantId();
        $data['requested_by'] = Auth::id();

        // Convert jalali date if needed
        if (!empty($data['expense_date'])) {
            $data['expense_date'] = \App\Helpers\CalendarHelper::parseDate($data['expense_date']);
        }

        // Handle currency conversion
        $baseCurrency = CurrencyHelper::getBaseCurrency();
        $selectedCurrency = Currency::find($data['currency_id']);

        if ($selectedCurrency && $baseCurrency && $selectedCurrency->id !== $baseCurrency->id) {
            $data['original_amount'] = $data['amount'];
            $data['amount'] = CurrencyHelper::convert(
                (float) $data['amount'],
                $selectedCurrency->code,
                $baseCurrency->code
            );
        }

        // Handle receipt upload
        if ($request->hasFile('receipt')) {
            $data['receipt_path'] = $request->file('receipt')->store('receipts', 'public');
        }

        $expense = Expense::create($data);

        // Handle multiple file attachments
        if ($request->hasFile('attachments')) {
            $expense->attachFiles($request->file('attachments'), 'receipt');
        }

        return redirect()
            ->route('expenses.show', $expense)
            ->with('success', __('expense.created_successfully'));
    }

    /**
     * Display the specified expense.
     */
    public function show(Expense $expense)
    {
        $this->authorize('view', $expense);

        $expense->load(['project', 'currency', 'requestedBy', 'approvedBy', 'pettyCash']);

        return view('expenses.show', compact('expense'));
    }

    /**
     * Show the form for editing the specified expense.
     */
    public function edit(Expense $expense)
    {
        $this->authorize('update', $expense);

        $projects = Project::whereIn('status', ['planning', 'active'])->get();
        $currencies = Currency::where('is_active', true)->get();
        $categories = ['materials', 'labor', 'equipment', 'transport', 'services', 'food', 'accommodation', 'other'];
        $baseCurrency = CurrencyHelper::getBaseCurrency();

        return view('expenses.form', compact('expense', 'projects', 'currencies', 'categories', 'baseCurrency'));
    }

    /**
     * Update the specified expense in storage.
     */
    public function update(StoreExpenseRequest $request, Expense $expense)
    {
        $this->authorize('update', $expense);

        $data = $request->validated();

        // Convert jalali date if needed
        if (!empty($data['expense_date'])) {
            $data['expense_date'] = \App\Helpers\CalendarHelper::parseDate($data['expense_date']);
        }

        // Handle currency conversion
        $baseCurrency = CurrencyHelper::getBaseCurrency();
        $selectedCurrency = Currency::find($data['currency_id']);

        if ($selectedCurrency && $baseCurrency && $selectedCurrency->id !== $baseCurrency->id) {
            $data['original_amount'] = $data['amount'];
            $data['amount'] = CurrencyHelper::convert(
                (float) $data['amount'],
                $selectedCurrency->code,
                $baseCurrency->code
            );
        }

        // Handle receipt upload
        if ($request->hasFile('receipt')) {
            // Delete old receipt
            if ($expense->receipt_path) {
                \Illuminate\Support\Facades\Storage::disk('public')->delete($expense->receipt_path);
            }
            $data['receipt_path'] = $request->file('receipt')->store('receipts', 'public');
        }

        $expense->update($data);

        // Handle multiple file attachments
        if ($request->hasFile('attachments')) {
            $expense->attachFiles($request->file('attachments'), 'receipt');
        }

        return redirect()
            ->route('expenses.show', $expense)
            ->with('success', __('expense.updated_successfully'));
    }

    /**
     * Remove the specified expense from storage.
     */
    public function destroy(Expense $expense)
    {
        $this->authorize('delete', $expense);

        $expense->delete();

        return redirect()
            ->route('expenses.index')
            ->with('success', __('expense.deleted_successfully'));
    }

    /**
     * Approve an expense via AJAX.
     */
    public function approve(Expense $expense)
    {
        $this->authorize('approve', $expense);

        $expense->update([
            'status' => 'approved',
            'approved_by' => Auth::id(),
            'approval_date' => now(),
        ]);

        // Update petty cash remaining if linked
        if ($expense->petty_cash_id && $expense->pettyCash) {
            $expense->pettyCash->updateRemaining();
        }

        return response()->json([
            'success' => true,
            'message' => __('expense.approved_successfully'),
            'status' => $expense->status,
        ]);
    }

    /**
     * Reject an expense via AJAX.
     */
    public function reject(Expense $expense)
    {
        $this->authorize('approve', $expense);

        $expense->update([
            'status' => 'rejected',
            'approved_by' => Auth::id(),
            'approval_date' => now(),
        ]);

        // Update petty cash remaining if linked
        if ($expense->petty_cash_id && $expense->pettyCash) {
            $expense->pettyCash->updateRemaining();
        }

        return response()->json([
            'success' => true,
            'message' => __('expense.rejected_successfully'),
            'status' => $expense->status,
        ]);
    }
}