<?php
namespace common\models;

use yii\db\ActiveRecord;
use yii\helpers\Security;
use yii\web\IdentityInterface;

/**
 * User model
 *
 * @property integer $id
 * @property string $username
 * @property string $password_hash
 * @property string $password_reset_token
 * @property string $email
 * @property string $auth_key
 * @property integer $role
 * @property integer $status
 * @property integer $created_at
 * @property integer $updated_at
 * @property string $password write-only password
 */
class User extends ActiveRecord implements IdentityInterface
{
	const STATUS_DELETED = 0;
	const STATUS_ACTIVE = 10;

	const ROLE_USER = 10;

	/**
	 * Creates a new user
	 *
	 * @param array $attributes the attributes given by field => value
	 * @return static|null the newly created model, or null on failure
	 */
	public static function create($attributes)
	{
		/** @var User $user */
		$user = new static();
		$user->setAttributes($attributes);
		$user->setPassword($attributes['password']);
		$user->generateAuthKey();
		if ($user->save()) {
			return $user;
		} else {
			return null;
		}
	}

	/**
	 * @inheritdoc
	 */
	public function behaviors()
	{
		return [
			'timestamp' => [
				'class' => 'yii\behaviors\TimestampBehavior',
				'attributes' => [
					ActiveRecord::EVENT_BEFORE_INSERT => ['created_at', 'updated_at'],
					ActiveRecord::EVENT_BEFORE_UPDATE => ['updated_at'],
				],
			],
		];
	}

	/**
	 * @inheritdoc
	 */
	public static function findIdentity($id)
	{
		return static::find($id);
	}

	/**
	 * Finds user by username
	 *
	 * @param string $username
	 * @return static|null
	 */
	public static function findByUsername($username)
	{
		return static::find(['username' => $username, 'status' => self::STATUS_ACTIVE]);
	}

	/**
	 * Finds user by password reset token
	 *
	 * @param string $token password reset token
	 * @return static|null
	 */
	public static function findByPasswordResetToken($token)
	{
		$expire = \Yii::$app->params['user.passwordResetTokenExpire'];
		$parts = explode('_', $token);
		$timestamp = (int)end($parts);
		if ($timestamp + $expire < time()) {
			// token expired
			return null;
		}

		return static::find([
			'password_reset_token' => $token,
			'status' => self::STATUS_ACTIVE,
		]);
	}

	/**
	 * @inheritdoc
	 */
	public function getId()
	{
		return $this->getPrimaryKey();
	}

	/**
	 * @inheritdoc
	 */
	public function getAuthKey()
	{
		return $this->auth_key;
	}

	/**
	 * @inheritdoc
	 */
	public function validateAuthKey($authKey)
	{
		return $this->getAuthKey() === $authKey;
	}

	/**
	 * Validates password
	 *
	 * @param string $password password to validate
	 * @return bool if password provided is valid for current user
	 */
	public function validatePassword($password)
	{
		return Security::validatePassword($password, $this->password_hash);
	}

	/**
	 * Generates password hash from password and sets it to the model
	 *
	 * @param string $password
	 */
	public function setPassword($password)
	{
		$this->password_hash = Security::generatePasswordHash($password);
	}

	/**
	 * Generates "remember me" authentication key
	 */
	public function generateAuthKey()
	{
		$this->auth_key = Security::generateRandomKey();
	}

	/**
	 * Generates new password reset token
	 */
	public function generatePasswordResetToken()
	{
		$this->password_reset_token = Security::generateRandomKey() . '_' . time();
	}

	/**
	 * Removes password reset token
	 */
	public function removePasswordResetToken()
	{
		$this->password_reset_token = null;
	}

	/**
	 * @inheritdoc
	 */
	public function rules()
	{
		return [
			['status', 'default', 'value' => self::STATUS_ACTIVE],
			['status', 'in', 'range' => [self::STATUS_ACTIVE, self::STATUS_DELETED]],

			['role', 'default', 'value' => self::ROLE_USER],
			['role', 'in', 'range' => [self::ROLE_USER]],

			['username', 'filter', 'filter' => 'trim'],
			['username', 'required'],
			['username', 'string', 'min' => 2, 'max' => 255],

			['email', 'filter', 'filter' => 'trim'],
			['email', 'required'],
			['email', 'email'],
			['email', 'unique'],
		];
	}
}