<?php

namespace App\Controllers;

use App\Models\CategoryModel;

class Categories extends BaseController
{
    private function model(): CategoryModel
    {
        return model(CategoryModel::class);
    }

    public function index()
    {
        return view('categories/index', [
            'title'      => 'Kategorie',
            'categories' => $this->model()->tree(),
        ]);
    }

    public function new()
    {
        return view('categories/form', [
            'title'   => 'Nowa kategoria',
            'cat'     => null,
            'parents' => $this->model()->tree(),
        ]);
    }

    public function create()
    {
        return $this->persist(null);
    }

    public function edit($id)
    {
        $cat = $this->model()->find((int) $id);
        if (! $cat) {
            return redirect()->to('/categories')->with('error', 'Nie znaleziono kategorii.');
        }

        return view('categories/form', [
            'title'   => 'Edycja kategorii',
            'cat'     => $cat,
            'parents' => $this->model()->tree(),
        ]);
    }

    public function update($id)
    {
        return $this->persist((int) $id);
    }

    public function delete($id)
    {
        $id = (int) $id;
        if ($this->model()->usedByOperations($id)) {
            return redirect()->to('/categories')
                ->with('error', 'Nie można usunąć kategorii używanej przez operacje. Najpierw przenieś lub usuń te operacje.');
        }
        $this->model()->delete($id);

        return redirect()->to('/categories')->with('success', 'Kategoria usunięta.');
    }

    private function persist(?int $id)
    {
        $data = [
            'name'      => trim((string) $this->request->getPost('name')),
            'type'      => (string) $this->request->getPost('type'),
            'parent_id' => $this->request->getPost('parent_id') ?: null,
        ];

        // Kategoria nie moze byc wlasnym rodzicem
        if ($id !== null && (int) $data['parent_id'] === $id) {
            $data['parent_id'] = null;
        }

        $model = $this->model();
        if ($id !== null) {
            $ok = $model->update($id, $data);
        } else {
            $ok = $model->insert($data);
        }

        if ($ok === false) {
            return redirect()->back()->withInput()
                ->with('error', implode(' ', $model->errors()));
        }

        return redirect()->to('/categories')->with('success', 'Zapisano kategorię.');
    }
}