<?php

namespace App\Http\Controllers;

use App\Models\Expense;
use App\Models\Month;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class ExpenseController extends Controller
{
    /**
     * Listar todos los gastos
     */
    public function index(Request $request)
    {
        $user = Auth::user();
        
        $monthId = $request->get('month_id');
        
        if ($monthId) {
            $month = $user->months()->findOrFail($monthId);
            $expenses = $month->expenses()
                ->orderBy('date', 'desc')
                ->paginate(30);
        } else {
            $month = null;
            $expenses = $user->expenses()
                ->orderBy('date', 'desc')
                ->paginate(30);
        }

        $months = $user->months()
            ->orderBy('year', 'desc')
            ->orderByRaw("FIELD(name, 'Enero', 'Febrero', 'Marzo', 'Abril', 'Mayo', 'Junio', 'Julio', 'Agosto', 'Septiembre', 'Octubre', 'Noviembre', 'Diciembre') DESC")
            ->get();

        return view('expenses.index', compact('expenses', 'month', 'months'));
    }

    /**
     * Mostrar formulario para crear gasto
     */
    public function create(Request $request)
    {
        $user = Auth::user();
        
        $monthId = $request->get('month_id');
        
        if ($monthId) {
            $month = $user->months()->findOrFail($monthId);
        } else {
            $month = $user->getCurrentMonth();
            
            if (!$month) {
                $month = $user->months()->latest()->first();
            }
        }

        if (!$month) {
            return redirect()->route('months.index')->with('info', 'Necesitas un mes de trabajo primero.');
        }

        return view('expenses.create', compact('month'));
    }

    /**
     * Guardar nuevo gasto
     */
    public function store(Request $request)
    {
        $user = Auth::user();
        
        $validated = $request->validate([
            'month_id' => ['required', 'exists:months,id'],
            'description' => ['required', 'string', 'max:255'],
            'amount' => ['required', 'numeric', 'min:0.01'],
            'date' => ['required', 'date'],
            'expense_type' => ['required', 'in:q1,q2,mensual'],
        ]);

        // Verificar que el mes pertenece al usuario
        $month = $user->months()->findOrFail($validated['month_id']);

        $month->expenses()->create([
            'user_id' => $user->id,
            'description' => $validated['description'],
            'amount' => $validated['amount'],
            'date' => $validated['date'],
            'expense_type' => $validated['expense_type'],
        ]);

        return redirect()->route('expenses.index', ['month_id' => $month->id])
            ->with('success', 'Gasto registrado correctamente.');
    }

    /**
     * Mostrar formulario de edición
     */
    public function edit(Expense $expense)
    {
        $user = Auth::user();
        
        if ($expense->user_id !== $user->id) {
            abort(403);
        }

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

    /**
     * Actualizar gasto
     */
    public function update(Request $request, Expense $expense)
    {
        $user = Auth::user();
        
        if ($expense->user_id !== $user->id) {
            abort(403);
        }

        $validated = $request->validate([
            'description' => ['required', 'string', 'max:255'],
            'amount' => ['required', 'numeric', 'min:0.01'],
            'date' => ['required', 'date'],
            'expense_type' => ['required', 'in:q1,q2,mensual'],
        ]);

        $expense->update($validated);

        return redirect()->route('expenses.index', ['month_id' => $expense->month_id])
            ->with('success', 'Gasto actualizado correctamente.');
    }

    /**
     * Eliminar gasto
     */
    public function destroy(Expense $expense)
    {
        $user = Auth::user();
        
        if ($expense->user_id !== $user->id) {
            abort(403);
        }

        $monthId = $expense->month_id;
        $expense->delete();

        return redirect()->route('expenses.index', ['month_id' => $monthId])
            ->with('success', 'Gasto eliminado correctamente.');
    }
}