<?php declare(strict_types=1);

/**
 * @license Apache 2.0
 */

namespace OpenApi\Processors;

use OpenApi\Analysis;
use OpenApi\Annotations\AbstractAnnotation;
use OpenApi\Generator;

/**
 * This would be detected as summary.
 *
 * And this would be detected
 * as the description.
 */
class DocBlockDescriptions
{
    /**
     * Checks if the annotation has a summary and/or description property
     * and uses the text in the comment block (above the annotations) as summary and/or description.
     *
     * Use null `@Annotation(description=null)` if you don't want the annotation to have a description.
     */
    public function __invoke(Analysis $analysis)
    {
        /** @var AbstractAnnotation $annotation */
        foreach ($analysis->annotations as $annotation) {
            if (property_exists($annotation, '_context') === false) {
                // only annotations with context
                continue;
            }
            $count = count($annotation->_context->annotations);
            if (!$annotation->isRoot()) {
                // only top-level annotations
                continue;
            }
            $hasSummary = property_exists($annotation, 'summary');
            $hasDescription = property_exists($annotation, 'description');
            if (!$hasSummary && !$hasDescription) {
                continue;
            }
            if ($hasSummary && $hasDescription) {
                $this->summaryAndDescription($annotation);
            } elseif ($hasDescription) {
                $this->description($annotation);
            }
        }
    }

    private function description($annotation): void
    {
        if ($annotation->description !== Generator::UNDEFINED) {
            if ($annotation->description === null) {
                $annotation->description = Generator::UNDEFINED;
            }

            return;
        }
        $annotation->description = $annotation->_context->phpdocContent();
    }

    private function summaryAndDescription($annotation): void
    {
        $ignoreSummary = $annotation->summary !== Generator::UNDEFINED;
        $ignoreDescription = $annotation->description !== Generator::UNDEFINED;
        if ($annotation->summary === null) {
            $ignoreSummary = true;
            $annotation->summary = Generator::UNDEFINED;
        }
        if ($annotation->description === null) {
            $annotation->description = Generator::UNDEFINED;
            $ignoreDescription = true;
        }
        if ($ignoreSummary && $ignoreDescription) {
            return;
        }
        if ($ignoreSummary) {
            $annotation->description = $annotation->_context->phpdocContent();
        } elseif ($ignoreDescription) {
            $annotation->summary = $annotation->_context->phpdocContent();
        } else {
            $annotation->summary = $annotation->_context->phpdocSummary();
            $annotation->description = $annotation->_context->phpdocDescription();
        }
    }
}