<?php declare(strict_types=1);

namespace Picea;

use Picea\Language\LanguageRegistration;

class Compiler
{
    protected string $sourceCode = "";

    protected array $syntaxObjectList = [];

    protected array $tagList = [];

    protected string $tagTokenOpen = "\{%";

    protected string $tagTokenClose = "%\}";

    protected array $extensionList = [];

    protected ? LanguageRegistration $languageRegistration;

    public function __construct(?LanguageRegistration $languageRegistration = null)
    {
        $this->languageRegistration = $languageRegistration;
    }

    public function compile(Compiler\Context $context) : string
    {
        $this->languageRegistration->registerAll($this);
        $context->compiler = $this;

        /**
         * Syntaxes such as {{ echo }} & {{= echo raw }} && {# comment #}
         */
        foreach($this->syntaxObjectList as $syntax) {
            $syntax->parse($context, $this->sourceCode);
        }

        /**
         * Control structures & functions {% functionName arguments %}
         */
        $replace = "#({$this->tagTokenOpen})(.*?)({$this->tagTokenClose})#s";

        $this->sourceCode = preg_replace_callback($replace, function ($matches) use (&$context) {
            $matches[2] = trim($matches[2]);

            list($token, $arguments) = array_pad(array_filter(explode(' ', $matches[2], 2), 'strlen'), 2, null);

            # @TODO Refractor this parts to allows registration to the tag's name
            if ( $this->tagList[$token] ?? false ) {
                return $this->tagList[$token]->parse($context, $arguments, $token);
            }
            elseif ( $this->extensionList[$token] ?? false ) {
                return $this->extensionList[$token]->parse($context, $arguments, $token);
            }
            else {
                throw new \LogicException("Impossible to find token `$token` declared in `{$matches[2]}`. Perhapse you forgot to add a custom token to Picea's engine ?");
            }

        }, $this->sourceCode);

        return $this->sourceCode;
    }

    public function loadSourceCode($html) : self
    {
        $this->sourceCode = $html;
        return $this;
    }

    public function registerCaching(CachingStrategy $cachingStrategy) : self
    {
    	return $this;
    }

    public function registerSyntax(Syntax\Syntax $syntaxObject) : self
    {
        $this->syntaxObjectList[get_class($syntaxObject)] = $syntaxObject;
        return $this;
    }

    public function registerControlStructure(ControlStructure\ControlStructure $controlStructureObject) : self
    {
        foreach($controlStructureObject->tokens ?? (array) $controlStructureObject->token as $token) {
            $this->tagList[$token] = $controlStructureObject;
        }

        return $this;
    }

    public function registerExtension(Extension\Extension $extension) : self
    {
        foreach($extension->tokens ?? (array) $extension->token as $token) {
            $this->extensionList[$token] = $extension;
        }

        return $this;
    }
}