<?php

namespace common\models;

use Ramsey\Uuid\Uuid;
use Yii;
use yii\behaviors\TimestampBehavior;
use yii\db\ActiveQuery;
use yii\db\Expression;
use yii\helpers\ArrayHelper;
use backend\modules\questionnaire\models\Question;
use backend\modules\questionnaire\models\UserResponse;
use \backend\modules\questionnaire\models\Answer;

/**
 * This is the model class for table "user_questionnaire".
 *
 * @property int $id
 * @property int $questionnaire_id
 * @property int $user_id
 * @property string $uuid
 * @property string $created_at
 * @property string $updated_at
 * @property int $score
 * @property int $status
 * @property double $percent_correct_answers
 *
 * @property Questionnaire $questionnaire
 * @property User $user
 * @property UserResponse[] $userResponses
 */
class UserQuestionnaire extends \yii\db\ActiveRecord
{
    const STATUS_PASSIVE = 0;
    const STATUS_ACTIVE = 1;

    /**
     * {@inheritdoc}
     */
    public static function tableName()
    {
        return 'user_questionnaire';
    }

    public function behaviors()
    {
        return [
            [
                'class' => TimestampBehavior::class,
                'createdAtAttribute' => 'created_at',
                'updatedAtAttribute' => 'updated_at',
                'value' => new Expression('NOW()'),
            ],
        ];
    }


    /**
     * {@inheritdoc}
     */
    public function rules()
    {
        return [
            [['questionnaire_id', 'user_id', 'status'], 'required'],
            [['questionnaire_id', 'user_id', 'score', 'status'], 'integer'],
            [['percent_correct_answers'], 'number'],
            [['created_at', 'updated_at'], 'safe'],
            [['uuid'], 'string', 'max' => 36],
            [['uuid'], 'unique'],
            [['questionnaire_id'], 'exist', 'skipOnError' => true, 'targetClass' => Questionnaire::className(), 'targetAttribute' => ['questionnaire_id' => 'id']],
            [['user_id'], 'exist', 'skipOnError' => true, 'targetClass' => User::className(), 'targetAttribute' => ['user_id' => 'id']],
        ];
    }

    public function beforeSave($insert)
    {
        if (parent::beforeSave($insert)) {
            $this->uuid = Uuid::uuid4()->toString();
            return true;
        } else {
            return false;
        }
    }

    /**
     * {@inheritdoc}
     */
    public function attributeLabels()
    {
        return [
            'id' => 'ID',
            'questionnaire_id' => 'Анкета',
            'user_id' => 'Пользователь',
            'uuid' => 'UUID',
            'score' => 'Балы',
            'status' => 'Статус',
            'created_at' => 'Дата создания',
            'updated_at' => 'Дата обновления',
            'percent_correct_answers' => 'Процент правильных ответов',
        ];
    }

    /**
     * @return ActiveQuery
     */
    public function getQuestionnaire(): ActiveQuery
    {
        return $this->hasOne(Questionnaire::className(), ['id' => 'questionnaire_id']);
    }

    /**
     * @return ActiveQuery
     */
    public function getUser()
    {
        return $this->hasOne(User::className(), ['id' => 'user_id']);
    }

    /**
     * @return ActiveQuery
     */
    public function getUserResponses(): ActiveQuery
    {
        return $this->hasMany(UserResponse::className(), ['user_questionnaire_id' => 'id']);
    }

    public function getQuestionnaireTitle()
    {
        return $this->getQuestionnaire()->one()->title;
    }

    public function getUserName()
    {
        return $this->getUser()->one()->username;
    }

    public function getCategoryId(): string
    {
        return $this->created_at;
    }

    public static function getQuestionnaireByUser($id): array
    {
        $questionnaire = ArrayHelper::map(self::find()->where(['user_id' => $id])
            ->with('questionnaire')->asArray()->all(),'id','questionnaire.title');


        $formatQuestionnaireArr = array();
        foreach ($questionnaire as $key => $value){
            $formatQuestionnaireArr[] = array('id' => $key, 'name' => $value);
        }

        return $formatQuestionnaireArr;
    }

    public function getStatuses(): array
    {
        return [
            self::STATUS_ACTIVE => 'Активен',
            self::STATUS_PASSIVE => 'Не используется'
        ];
    }

    public function getStatusText()
    {
        return $this->statuses[$this->status];
    }

    public function checkAnswerFlagsForNull(): bool
    {
        $responses = $this->getUserResponses()->AsArray()->all();
        foreach ($responses as $response)
        {
            if (ArrayHelper::isIn(null, $response))
                return false;
        }
        return true;
    }

    public function getQuestions(): ActiveQuery
    {
        return $this->hasMany(Question::className(), ['id' => 'question_id'])
            ->viaTable('user_response', ['user_questionnaire_id' => 'id']);
    }

    public function getScore()
    {
        $responses_questions = $this->hasMany(UserResponse::className(), ['user_questionnaire_id' => 'id'])
            ->joinWith('question')->asArray()->all();

        $calc_score = $this->calculateScore($responses_questions);
        $this->score = $calc_score;
        $this->save();
    }

    protected function calculateScore($responses_questions)
    {
        $score = null;
        $user_correct_answers_num = null;
        foreach ($responses_questions as $response_question)
        {
            if($this->isCorrect($response_question['answer_flag']))
            {
                $user_correct_answers_num += 1;
                switch ($response_question['question']['question_type_id'])
                {
                    case '1':  // open question
                        $score += $response_question['answer_flag'] * $response_question['question']['score'];
                        break;
                    case '2':  // one answer
                        $score += $response_question['question']['score'];
                        break;
                    case '3':  // multi answer
                        $score += $response_question['question']['score'] / $this->correctAnswersNum($response_question['question']['id']);
                        break;
                }
            }
        }

        $this->setPercentCorrectAnswers($user_correct_answers_num);

        if($score === null) {
            return $score;
        }
        else {
            return round($score);
        }
    }

    protected function correctAnswersNum($question_id)
    {
        return Answer::getCorrectAnswersNum($question_id);
    }

    protected function isCorrect($answer_flag): bool
    {
        if ($answer_flag > 0) {
            return true;
        }
        return false;
    }

    protected function setPercentCorrectAnswers($user_correct_answers_num)
    {
        $all_correct_answers_num = $this->numCorrectAnswersWithoutOpenQuestions();
        $all_correct_answers_num += $this->numOpenQuestionsAnswers();

        $percent = $user_correct_answers_num / $all_correct_answers_num;

        $this->percent_correct_answers = round($percent, 2);
        $this->save();
    }

    protected function numCorrectAnswersWithoutOpenQuestions()
    {
        return $this->hasMany(Answer::className(), ['question_id' => 'question_id'])
            ->viaTable('user_response', ['user_questionnaire_id' => 'id'])
            ->where(['answer_flag' => '1'])
            ->andWhere(['status' => '1'])
            ->count();
    }

    protected function numOpenQuestionsAnswers()
    {
        return $this->hasMany(Question::className(), ['id' => 'question_id'])
            ->viaTable('user_response', ['user_questionnaire_id' => 'id'])
            ->where(['question_type_id' => '1'])
            ->count();
    }

    public function rateResponses()
    {
        $responses = $this->getUserResponses()->all();

        foreach ($responses as $response)
        {
            $response->rateResponse();
        }
    }

    public static function findActiveUserQuestionnaires($user_id)
    {
        return self::find()->where(['user_id' => $user_id])
            ->andWhere(['status' => '1'])
            ->all();
    }
}