<?php
/**
 * @link http://www.noghteh.ir/
 * @copyright Copyright (c) 2015 Noghteh
 * @license http://www.noghteh.ir/license/
 */

namespace common\components\telegram;

use Yii;
use yii\base\Model;
use airani\telegram\TelegramBot;
use common\models\ChannelMember;
use common\models\Chat as ChatModel;
use common\components\telegram\types\Chat;
use common\components\telegram\types\Update;

/**
 * TelegramParser
 * Parse telegram requests
 *
 * @property array $commandPatterns
 * @property array $commands
 * @property \common\models\Bot $bot
 * @property Update $update
 * @property ChannelMember $channelMember
 * @property ChatModel $chatModel
 *
 * @author Ali Irani <ali@irani.im>
 */
class Parser extends Model
{
    public $bot;

    private $_update;
    private $_commands;

    /**
     * Set data cache
     * @param $key
     * @param $value
     * @param int $duration
     * @param null $dependency
     * @return bool
     */
    public function cacheSet($key, $value, $duration = 60, $dependency = null)
    {
        return Yii::$app->cache->set('telegram:' . $key, $value, $duration, $dependency);
    }

    /**
     * Returns data cache by key
     * @param $key
     * @return mixed
     */
    public function cacheGet($key)
    {
        return Yii::$app->cache->get('telegram:' . $key);
    }

    /**
     * Delete Cache
     * @param $key
     * @return mixed
     */
    public function cacheDelete($key)
    {
        return Yii::$app->cache->delete('telegram:' . $key);
    }

    public function getUpdate()
    {
        return $this->_update;
    }

    public function setUpdate($params)
    {
        $this->_update = new Update($params);
    }

    /**
     * Parse telegram request
     */
    public function parse()
    {
        $this->saveChat();

        if ($this->update->baseMessage->isLeftChat()) {
            $this->leftGroup();
        } elseif ($this->update->baseMessage->isNewChat()) {
            $this->activateChat();
        }

        $this->parseCommands();
    }

    /**
     * Returns chat model object
     * @return null|static
     */
    public function getChatModel()
    {
        $message = $this->update->baseMessage;
        $chatId = $message->migrate_to_chat_id ?: $message->chat->id;
        /** @var ChatModel $chat */
        if ($chatAttr = $this->cacheGet("chat:$chatId")) {
            $chat = new ChatModel($chatAttr);
            $chat->setOldAttributes($chatAttr);
            return $chat;
        }

        if ($chat = ChatModel::findOne(['chat_id' => $chatId])) {
            $this->cacheSet("chat:$chatId", $chat->attributes);
        }
        return $chat;
    }

    /**
     * Returns Channel Member model object
     * @return ChannelMember
     */
    public function getChannelMember()
    {
        $chatId = $this->update->baseMessage->chat->id;
        /** @var ChannelMember $channelMember */
        if ($channelMemberAttr = $this->cacheGet("channelMember:$chatId")) {
            $channelMember = new ChannelMember($channelMemberAttr);
            $channelMember->setOldAttributes($channelMemberAttr);
            return $channelMember;
        }

        $channelMember = ChannelMember::findOne([
            'channel_id' => $this->bot->channel_id,
            'member_id' => $this->chatModel->member_id
        ]);
        if ($channelMember) {
            $this->cacheSet("channelMember:$chatId", $channelMember->attributes);
        }
        return $channelMember;
    }

    /**
     * Save chat
     * @return bool
     */
    public function saveChat()
    {
        if (($chat = $this->chatModel) === null) {
            $message = $this->update->baseMessage;
            $chatId = $message->migrate_to_chat_id ?: $message->chat->id;
            $chat = new ChatModel([
                'chat_id' => $chatId,
                'name' => $message->chat->name,
                'username' => $message->chat->username ?: '',
                'type' => self::getChatTypesId()[$message->chat->type],
            ]);

            if ($chat->save() === false) {
                Yii::error(['message' => 'Save new chat failed.', 'errors' => $chat->errors], __METHOD__);
                return false;
            }
        }

        if (($this->channelMember) === null) {
            $channelMember = new ChannelMember([
                'channel_id' => $this->bot->channel_id,
                'member_id' => $chat->member_id,
            ]);

            if ($channelMember->save() === false) {
                Yii::error(['message' => 'Save new channel member failed.', 'errors' => $channelMember->errors], __METHOD__);
                return false;
            }
        }

        return true;
    }

    /**
     * Check message with available commands and execute appropriate command
     * @return bool
     */
    public function parseCommands()
    {
        $textWords = explode(' ', $this->update->baseMessage->text);
        if (empty($textWords)) {
            return false;
        }
        $text = $this->getResponseCommand() ?: strtolower($textWords[0]);
        $patterns = $this->commandPatterns;

        foreach ([$text, $this->update->baseMessage->text] as $pattern) {
            $commandIndex = array_search($pattern, $patterns, false);
            if ($commandIndex !== false) {
                $command = $this->getCommands()[$commandIndex];
                $command->run();
                return true;
            }
        }

        return false;
    }

    /**
     * Returns all available commands
     * @return array
     */
    public function getCommands()
    {
        if ($this->_commands) {
            return $this->_commands;
        }
        $path = Yii::getAlias('@common/components/telegram/commands');
        $namespace = '\common\components\telegram\commands';
        $files = glob($path.'/*.php');
        $commands = [];

        foreach ($files as $file) {
            if (preg_match('/.*\/([\w]+Command).php/', $file, $matches)) {
                $className = $namespace . '\\' . $matches[1];
                $commands[] = new $className(['bot' => $this->bot, 'update' => $this->update]);
            }
        }
        
        $this->_commands = $commands;
        return $commands;
    }

    /**
     * Returns patterns of available commands
     * @return array
     */
    public function getCommandPatterns()
    {
        $commands = $this->getCommands();
        if (count($commands) === 0) {
            return [];
        }

        $patterns = [];
        foreach ($commands as $command) {
            $patterns[] = $command->getPattern();
        }
        
        return $patterns;
    }

    /**
     * Returns response command if is set
     * @return mixed | null
     */
    public function getResponseCommand()
    {
        $response = Yii::$app->cache->get('reply:' . $this->update->baseMessage->chat->id);
        return isset($response['command']) ? $response['command'] : null;
    }

    /**
     * Change channel member status to the left group
     * @return bool
     */
    public function leftGroup()
    {
        if ($this->channelMember) {
            $chatId = $this->update->baseMessage->chat->id;
            $this->cacheDelete("channelMember:$chatId");
            return $this->channelMember->leftGroup() ? true : false;
        }
        return false;
    }

    /**
     * Change channel member status to active
     * @return bool
     */
    public function activateChat()
    {
        if ($this->channelMember) {
            $chatId = $this->update->baseMessage->chat->id;
            $this->cacheDelete("channelMember:$chatId");
            return $this->channelMember->activate() ? true : false;
        }
        return false;
    }

    /**
     * Returns types id of chat model
     * @return array
     */
    public static function getChatTypesId()
    {
        return [
            Chat::TYPE_CHANNEL => ChatModel::TYPE_CHANNEL,
            Chat::TYPE_PRIVATE => ChatModel::TYPE_USER,
            Chat::TYPE_GROUP => ChatModel::TYPE_GROUP,
            Chat::TYPE_SUPER_GROUP => ChatModel::TYPE_SUPER_GROUP,
        ];
    }
}