<?php
namespace common\models;

use Yii;
use yii\base\Model;

/**
 * Login form
 */
class LoginForm extends Model
{
    public $username;
    public $password;
    public $token;
    public $rememberMe = true;

    private $_user;

    //定义场景
    const SCENARIOS_LOGIN = 'login';

    /**
     * @inheritdoc
     */
    public function rules()
    {
        return [
            // username and password are both required
            [['username', 'password'], 'required'],
            // rememberMe must be a boolean value
            ['rememberMe', 'boolean'],
            // password is validated by validatePassword()
            ['password', 'validatePassword'],
        ];
    }

    public function scenarios() {
        $scenarios = [
            self:: SCENARIOS_LOGIN => ['username', 'password'],
        ];
        return array_merge( parent:: scenarios(), $scenarios);
    }

    /**
     * Validates the password.
     * This method serves as the inline validation for password.
     *
     * @param string $attribute the attribute currently being validated
     * @param array $params the additional name-value pairs given in the rule
     */
    public function validatePassword($attribute, $params)
    {
        if (!$this->hasErrors()) {
            $user = $this->getUser();
            if (!$user || !$user->validatePassword($this->password)) {
                $this->addError($attribute, 'Incorrect username or password.');
            }
        }
    }

    /**
     * Logs in a user using the provided username and password.
     *
     * @return bool whether the user is logged in successfully
     */
    public function login()
    {
        if ($this->validate()) {
            if ($this->getUser()) {
                $access_token = $this->_user->generateAccessToken();
                $this->_user->access_token = $access_token ;
                $this->_user->save();
                return $access_token;
            }
        }
        
        return false;
    }

    /**
     * Finds user by [[username]]
     *
     * @return User|null
     */
    protected function getUser()
    {
        if ($this->_user === null) {
            $this->_user = Admin::findByUsername($this->username);
        }

        return $this->_user;
    }

    /**
     * Finds user by [[token]]
     *
     * @return User|null
     */
    protected function getToken()
    {
        if ($this->_user === null) {
            $this->_user = Admin::findIdentityByAccessToken($this->token);
        }

        return $this->_user;
    }
}