<?php declare(strict_types=1);
namespace openvk\Web\Themes;

class Themepack
{
    private $id;
    private $ver;
    private $meta;
    private $home;
    
    function __construct(string $id, string $ver, object $meta)
    {
        $this->id   = $id;
        $this->ver  = $ver;
        $this->meta = $meta;
        $this->home = OPENVK_ROOT . "/themepacks/$id";
    }
    
    function getId(): string
    {
        return $this->id;
    }
    
    function getName(?string $lang = NULL): string
    {
        if(!$this->meta->name)
            return $this->getId() . " theme";
        else if(is_array($this->meta->name))
            return $this->meta->name[$lang ?? "_"] ?? $this->getId() . " theme";
        else
            return $this->meta->name;
    }
    
    function getVersion(): string
    {
        return $this->ver;
    }
    
    function getDescription(): string
    {
        return $this->meta->description ?? "A theme with name \"" . $this->getName() . "\"";
    }
    
    function getAuthor(): string
    {
        return $this->meta->author ?? $this->getName() . " authors";
    }
    
    function fetchStyleSheet(): ?string
    {
        $file = "$this->home/stylesheet.css";
        return file_exists($file) ? file_get_contents($file) : NULL;
    }
    
    function fetchStaticResource(string $name): ?string
    {
        $file = "$this->home/res/$name";
        return file_exists($file) ? file_get_contents($file) : NULL;
    }
    
    static function themepackFromDir(string $dirname): Themepack
    {
        $manifestFile = "$dirname/theme.yml";
        if(!file_exists($manifestFile))
            throw new Exceptions\NotThemeDirectoryException("Could not locate manifest at $dirname");
        
        $manifest = (object) chandler_parse_yaml($manifestFile);
        if(!isset($manifest->id) || !isset($manifest->version) || !isset($manifest->openvk_version) || !isset($manifest->metadata))
            throw new Exceptions\MalformedManifestException("Manifest is missing required information");
        
        if($manifest->openvk_version > Themepacks::THEMPACK_ENGINE_VERSION)
            throw new Exceptions\IncompatibleThemeException("Theme is built for newer OVK (themeEngine" . $manifest->openvk_version . ")");
        
        return new static($manifest->id, $manifest->version, (object) $manifest->metadata);
    }
}