<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\rest;

use yii\base\InvalidConfigException;
use yii\base\Model;

/**
 * ActiveController implements a common set of actions for supporting RESTful access to ActiveRecord.
 *
 * The class of the ActiveRecord should be specified via [[modelClass]], which must implement [[\yii\db\ActiveRecordInterface]].
 * By default, the following actions are supported:
 *
 * - `index`: list of models
 * - `view`: return the details of a model
 * - `create`: create a new model
 * - `update`: update an existing model
 * - `delete`: delete an existing model
 * - `options`: return the allowed HTTP methods
 *
 * You may disable some of these actions by overriding [[actions()]] and unsetting the corresponding actions.
 *
 * To add a new action, either override [[actions()]] by appending a new action class or write a new action method.
 * Make sure you also override [[verbs()]] to properly declare what HTTP methods are allowed by the new action.
 *
 * You should usually override [[checkAccess()]] to check whether the current user has the privilege to perform
 * the specified action against the specified model.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class ActiveController extends Controller
{
    /**
     * @var string the model class name. This property must be set.
     */
    public $modelClass;
    /**
     * @var string the scenario used for updating a model.
     * @see \yii\base\Model::scenarios()
     */
    public $updateScenario = Model::SCENARIO_DEFAULT;
    /**
     * @var string the scenario used for creating a model.
     * @see \yii\base\Model::scenarios()
     */
    public $createScenario = Model::SCENARIO_DEFAULT;
    /**
     * @var boolean whether to use a DB transaction when creating, updating or deleting a model.
     * This property is only useful for relational database.
     */
    public $transactional = true;

    /**
     * @inheritdoc
     */
    public function init()
    {
        parent::init();
        if ($this->modelClass === null) {
            throw new InvalidConfigException('The "modelClass" property must be set.');
        }
    }

    /**
     * @inheritdoc
     */
    public function actions()
    {
        return [
            'index' => [
                'class' => 'yii\rest\IndexAction',
                'modelClass' => $this->modelClass,
                'checkAccess' => [$this, 'checkAccess'],
            ],
            'view' => [
                'class' => 'yii\rest\ViewAction',
                'modelClass' => $this->modelClass,
                'checkAccess' => [$this, 'checkAccess'],
            ],
            'create' => [
                'class' => 'yii\rest\CreateAction',
                'modelClass' => $this->modelClass,
                'checkAccess' => [$this, 'checkAccess'],
                'scenario' => $this->createScenario,
                'transactional' => $this->transactional,
            ],
            'update' => [
                'class' => 'yii\rest\UpdateAction',
                'modelClass' => $this->modelClass,
                'checkAccess' => [$this, 'checkAccess'],
                'scenario' => $this->updateScenario,
                'transactional' => $this->transactional,
            ],
            'delete' => [
                'class' => 'yii\rest\DeleteAction',
                'modelClass' => $this->modelClass,
                'checkAccess' => [$this, 'checkAccess'],
                'transactional' => $this->transactional,
            ],
            'options' => [
                'class' => 'yii\rest\OptionsAction',
            ],
        ];
    }

    /**
     * @inheritdoc
     */
    protected function verbs()
    {
        return [
            'index' => ['GET', 'HEAD'],
            'view' => ['GET', 'HEAD'],
            'create' => ['POST'],
            'update' => ['PUT', 'PATCH'],
            'delete' => ['DELETE'],
        ];
    }
}