File: LinkGenerator.php

<?php

namespace StartDir;

class LinkGenerator
{
    /**
     * @var array<string, array<string, string>>
     */
    private array $templates = [];

    public function __construct(array $defaultTemplates = [])
    {
        $this->templates = $defaultTemplates;
    }
    
    public function addDefaults(){
    
        //following & followers
    
        
        //mastodon
        $this->addTemplate(   
            'misskey',    
            'following',   
            'https://{instance}/@{username}/following'
        );
        
        $this->addTemplate(  
            'misskey',  
            'followers',  
            'https://{instance}/@{username}/followers'
        );        
        
        
        
        //mastodon
        $this->addTemplate(   
            'mastodon',    
            'following',   
            'https://{instance}/@{username}/following'
        );
        
        $this->addTemplate(  
            'mastodon',  
            'followers',  
            'https://{instance}/@{username}/followers'
        );
        
        //hometown
        $this->addTemplate(   
            'hometown',    
            'following',   
            'https://{instance}/@{username}/following'
        );
        
        $this->addTemplate(  
            'hometown',  
            'followers',  
            'https://{instance}/@{username}/followers'
        );    
        
        //friendica
        $this->addTemplate(   
            'friendica',    
            'following',   
            'https://{instance}/profile/{username}/contacts/following'
        );
        
        $this->addTemplate(  
            'friendica',  
            'followers',  
            'https://{instance}/profile/{username}/contacts/followers'
        );
                
        
        
        
        
        // search
        $this->addTemplate(  
            'elgg',   
            'search',   
            'https://{instance}/search?q={q}'
        );
                    
        $this->addTemplate(  
            'flohmarkt',   
            'search',   
            'https://{instance}/search?q={q}'
        );
                
        
    /*    
        $this->addTemplate(  
            'ecko',   
            'search',   
            'https://{instance}/search?q={q}'
        );
    
        $this->addTemplate(  
            'fedibird',   
            'search',   
            'https://{instance}/search?q={q}'
        );
        */    
        $this->addTemplate(  
            'hometown',   
            'search',   
            'https://{instance}/search?q={q}'
        );
        
        $this->addTemplate(  
            'mastodon',   
            'search',   
            'https://{instance}/search?q={q}'
        );

        $this->addTemplate(   
            'friendica',   
            'search',   
            'https://{instance}/search?q={q}'
        );    
        

        $this->addTemplate(   
            'wordpress',   
            'search',   
            'https://{instance}/?s={s}'
        );        
        

        $this->addTemplate(   
            'peertube',   
            'search',   
            'https://{instance}/search?search={search}'
        );            
    }


    public function templateExists(string $software, string $module): bool
    {
        $software = strtolower($software);  
        return isset($this->templates[$software][$module])      
            && is_string($this->templates[$software][$module])     
            && $this->templates[$software][$module] !== '';
    }
    
    
    public function addTemplate(
        string $software,
        string $modul,
        string $template
    ): void {
        $this->templates[strtolower($software)][$modul] = $template;
    }

    public function generateLink(
        string $instance,
        string $software,
        string $modul = 'search',
        array $params = []
    ): string {
        $software = strtolower($software);
        if (!isset($this->templates[$software][$modul])) {
            throw new \InvalidArgumentException(
                sprintf(
                    'Kein Template f?r Modul "%s" in Software "%s" definiert.',
                    $modul,
                    $software
                )
            );
        }

        $template = $this->templates[$software][$modul];

        $replacements = [
            '{instance}' => rawurlencode($instance),
        ];

        foreach ($params as $key => $value) {
            $replacements['{' . $key . '}'] = rawurlencode($value);
        }

        $result = strtr($template, $replacements);

        if (preg_match('/\{[a-zA-Z0-9_]+\}/', $result)) {
            throw new \RuntimeException(
                'Nicht ersetzte Platzhalter im Template vorhanden: ' . $result
            );
        }

        return $result;
    }

 public function getFormHtml(
    string $instance,
    string $software,
    string $modul = 'search',
    string $method = 'GET',
    array $defaultValues = [],
    array $formAttributes = []
 ): string {

    $software = strtolower($software);

    if (!isset($this->templates[$software][$modul])) {
        throw new \InvalidArgumentException(
            sprintf(
                'Kein Template f?r Modul "%s" in Software "%s" definiert.',
                $modul,
                $software
            )
        );
    }

    $template = $this->templates[$software][$modul];

    // --- Template vorbereiten (nur {instance} ersetzen) ---
    $preparedUrl = str_replace(
        '{instance}',
        rawurlencode($instance),
        $template
    );

    $method = strtoupper($method) === 'POST' ? 'POST' : 'GET';

    // URL in Bestandteile zerlegen
    $parsed = parse_url($preparedUrl);

    $path = $parsed['scheme'] . '://' . $parsed['host']
        . ($parsed['path'] ?? '');

    $queryPart = $parsed['query'] ?? '';

    // --- Query-Placeholder extrahieren ---
    preg_match_all('/\{([a-zA-Z0-9_]+)\}/', $queryPart, $queryMatches);
    $queryFields = array_unique($queryMatches[1]);

    // --- Path-Placeholder extrahieren ---
    preg_match_all('/\{([a-zA-Z0-9_]+)\}/', $path, $pathMatches);
    $pathFields = array_unique($pathMatches[1]);

    // --- Action bestimmen ---
    $action = $path;

    // Form-Attribute bauen
    $attrString = '';
    foreach ($formAttributes as $key => $value) {
        $attrString .= sprintf(
            ' %s="%s"',
            htmlspecialchars($key, ENT_QUOTES),
            htmlspecialchars($value, ENT_QUOTES)
        );
    }

    $html = sprintf(
        '<form method="%s" action="%s"%s>',
        htmlspecialchars($method, ENT_QUOTES),
        htmlspecialchars($action, ENT_QUOTES),
        $attrString
    );

    // --- Path-Felder als hidden ---
    foreach ($pathFields as $field) {

        if ($field === 'instance') {
            continue;
        }

        $value = $defaultValues[$field] ?? '';

        $html .= sprintf(
            '<input type="hidden" name="%s" value="%s">',
            htmlspecialchars($field, ENT_QUOTES),
            htmlspecialchars($value, ENT_QUOTES)
        );
    }

    // --- Query-Felder als Textfelder ---
    foreach ($queryFields as $field) {

        $value = $defaultValues[$field] ?? '';

        $html .='<span style="position:relative;display:inline-block;">'
            .sprintf(
            '<input type="text" name="%s" value="%s" placeholder="&#128269;" ng-model="searchInInstanceFormValue"
        style="padding-right:22px;"
        oninput="this.nextElementSibling.style.display=this.value?\'block\':\'none\';">',
            htmlspecialchars($field, ENT_QUOTES),
            htmlspecialchars($value, ENT_QUOTES)
        ).'<span 
        onclick="this.previousElementSibling.value=\'\';this.style.display=\'none\';this.previousElementSibling.focus();"
        style="
            display:' . ($value !== '' ? 'block' : 'none') . ';
            position:absolute;
            right:6px;
            top:50%;
            transform:translateY(-50%);
            cursor:pointer;
            font-weight:bold;
            color:#666;
            user-select:none;
        "
    >?</span>
</span>';
    }

    $html .= '<button type="submit" class="btn-sm btn-info">
      <span ng-show="langIsDefault==true || langShortCode==\'en\'" ng-cloak>Search <span ng-show="searchInInstanceFormValue">for &quot;{{searchInInstanceFormValue }}&quot;</span> on '.ucfirst($instance).' &#128269;</span>
      <span ng-show="langShortCode==\'de\'" ng-cloak>Auf '.ucfirst($instance).' <span ng-show="searchInInstanceFormValue">nach &quot;{{searchInInstanceFormValue }}&quot;</span> suchen &#128269;</span>
    </button>';
    $html .= '</form>';

    return $html;
 }

}