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<?php

/**
 * Copyright 2018 LINE Corporation
 *
 * LINE Corporation licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

namespace LINE\LINEBot\MessageBuilder\Flex\ComponentBuilder;

use LINE\LINEBot\Constant\Flex\ComponentSpaceSize;
use LINE\LINEBot\Constant\Flex\ComponentType;
use LINE\LINEBot\MessageBuilder\Flex\ComponentBuilder;
use LINE\LINEBot\Util\BuildUtil;

/**
 * A builder class for spacer component.
 *
 * @package LINE\LINEBot\MessageBuilder\Flex\ComponentBuilder
 */
class SpacerComponentBuilder implements ComponentBuilder
{
    /** @var ComponentSpaceSize */
    private $size;

    /** @var array */
    private $component;

    /**
     * SpacerComponentBuilder constructor.
     *
     * @param ComponentSpaceSize|string $size
     */
    public function __construct($size)
    {
        $this->size = $size;
    }

    /**
     * Create empty SpacerComponentBuilder.
     *
     * @return SpacerComponentBuilder
     */
    public static function builder()
    {
        return new self(null);
    }

    /**
     * Set size.
     *
     * @param ComponentSpaceSize|string $size
     * @return SpacerComponentBuilder
     */
    public function setSize($size)
    {
        $this->size = $size;
        return $this;
    }

    /**
     * Builds spacer component structure.
     *
     * @return array
     */
    public function build()
    {
        if (isset($this->component)) {
            return $this->component;
        }

        $this->component = BuildUtil::removeNullElements([
            'type' => ComponentType::SPACER,
            'size' => $this->size,
        ]);

        return $this->component;
    }
}