<?php

namespace Knuckles\Scribe\Extracting\Strategies\Metadata;

use Knuckles\Camel\Extraction\ExtractedEndpointData;
use Knuckles\Scribe\Extracting\RouteDocBlocker;
use Knuckles\Scribe\Extracting\Strategies\Strategy;
use Mpociot\Reflection\DocBlock;

class GetFromDocBlocks extends Strategy
{
    public function __invoke(ExtractedEndpointData $endpointData, array $routeRules = []): array
    {
        $docBlocks = RouteDocBlocker::getDocBlocksFromRoute($endpointData->route);
        $methodDocBlock = $docBlocks['method'];
        $classDocBlock = $docBlocks['class'];

        return $this->getMetadataFromDocBlock($methodDocBlock, $classDocBlock);
    }

    public function getMetadataFromDocBlock(DocBlock $methodDocBlock, DocBlock $classDocBlock): array
    {
        [$groupName, $groupDescription, $title] = $this->getEndpointGroupAndTitleDetails($methodDocBlock, $classDocBlock);

        $metadata = [
            'groupName' => $groupName,
            'groupDescription' => $groupDescription,
            'subgroup' => $this->getEndpointSubGroup($methodDocBlock, $classDocBlock),
            'subgroupDescription' => $this->getEndpointSubGroupDescription($methodDocBlock, $classDocBlock),
            'title' => $title ?: $methodDocBlock->getShortDescription(),
            'description' => $methodDocBlock->getLongDescription()->getContents(),
            'deprecated' => $this->getDeprecatedStatusFromDocBlock($methodDocBlock, $classDocBlock),
        ];
        if (!is_null($authStatus = $this->getAuthStatusFromDocBlock($methodDocBlock, $classDocBlock))) {
            $metadata['authenticated'] = $authStatus;
        }
        return $metadata;
    }

    protected function getAuthStatusFromDocBlock(DocBlock $methodDocBlock, ?DocBlock $classDocBlock = null): ?bool
    {
        foreach ($methodDocBlock->getTags() as $tag) {
            if (strtolower($tag->getName()) === 'authenticated') {
                return true;
            }

            if (strtolower($tag->getName()) === 'unauthenticated') {
                return false;
            }
        }

        return $classDocBlock
            ? $this->getAuthStatusFromDocBlock($classDocBlock)
            : null;
    }

    protected function getDeprecatedStatusFromDocBlock(DocBlock $methodDocBlock, ?DocBlock $classDocBlock = null): bool
    {
        foreach ($methodDocBlock->getTags() as $tag) {
            if (strtolower($tag->getName()) === 'deprecated') {
                return true;
            }
        }

        return $classDocBlock && $this->getDeprecatedStatusFromDocBlock($classDocBlock);
    }

    /**
     * @return array The endpoint's group name, the group description, and the endpoint title
     */
    protected function getEndpointGroupAndTitleDetails(DocBlock $methodDocBlock, DocBlock $controllerDocBlock)
    {
        foreach ($methodDocBlock->getTags() as $tag) {
            if ($tag->getName() === 'group') {
                $endpointGroupParts = explode("\n", trim($tag->getContent()));
                $endpointGroupName = array_shift($endpointGroupParts);
                $endpointGroupDescription = trim(implode("\n", $endpointGroupParts));

                // If the endpoint has no title (the methodDocBlock's "short description"),
                // we'll assume the endpointGroupDescription is actually the title
                // Something like this:
                // /**
                //   * Fetch cars. <-- This is endpoint title.
                //   * @group Cars <-- This is group name.
                //   * APIs for cars. <-- This is group description (not required).
                //   **/
                // VS
                // /**
                //   * @group Cars <-- This is group name.
                //   * Fetch cars. <-- This is endpoint title, NOT group description.
                //   **/

                // BTW, this is a spaghetti way of doing this.
                // It shall be refactored soon. Deus vult!💪
                // ...Or maybe not
                if (empty($methodDocBlock->getShortDescription())) {
                    return [$endpointGroupName, '', $endpointGroupDescription];
                }

                return [$endpointGroupName, $endpointGroupDescription, $methodDocBlock->getShortDescription()];
            }
        }

        // Fall back to the controller
        foreach ($controllerDocBlock->getTags() as $tag) {
            if ($tag->getName() === 'group') {
                $endpointGroupParts = explode("\n", trim($tag->getContent()));
                $endpointGroupName = array_shift($endpointGroupParts);
                $endpointGroupDescription = implode("\n", $endpointGroupParts);

                return [$endpointGroupName, $endpointGroupDescription, $methodDocBlock->getShortDescription()];
            }
        }

        return [null, '', $methodDocBlock->getShortDescription()];
    }

    protected function getEndpointSubGroup(DocBlock $methodDocBlock, DocBlock $controllerDocBlock): ?string
    {
        foreach ($methodDocBlock->getTags() as $tag) {
            if (strtolower($tag->getName()) === 'subgroup') {
                return trim($tag->getContent());
            }
        }

        foreach ($controllerDocBlock->getTags() as $tag) {
            if (strtolower($tag->getName()) === 'subgroup') {
                return trim($tag->getContent());
            }
        }

        return null;
    }

    protected function getEndpointSubGroupDescription(DocBlock $methodDocBlock, DocBlock $controllerDocBlock): ?string
    {
        foreach ($methodDocBlock->getTags() as $tag) {
            if (strtolower($tag->getName()) === 'subgroupdescription') {
                return trim($tag->getContent());
            }
        }

        foreach ($controllerDocBlock->getTags() as $tag) {
            if (strtolower($tag->getName()) === 'subgroupdescription') {
                return trim($tag->getContent());
            }
        }

        return null;
    }
}
