<?php

namespace Automad\Engine\Processors;

use Automad\Core\Automad;
use Automad\Engine\FeatureProvider;
use Automad\Engine\PatternAssembly;
use Automad\Engine\Runtime;

/**
 * The main template processor.
 *
 * @author Marc Anton Dahmen
 * @copyright Copyright (c) 2021-2023 by Marc Anton Dahmen - https://marcdahmen.de
 * @license MIT license - https://automad.org/license
 */
class TemplateProcessor
{
	/** The main Automad instance. */
	private Automad $Automad;

	/** The content processor instance. */
	private ContentProcessor $ContentProcessor;

	/** An array of all existing feature processor instances. */
	private array $featureProcessors;

	/** The Runtime instance. */
	private Runtime $Runtime;


	/**
	 * The template processor constructor.
	 *
	 * @param Automad $Automad
	 * @param Runtime $Runtime
	 * @param ContentProcessor $ContentProcessor
	 */
	public function __construct(Automad $Automad, Runtime $Runtime, ContentProcessor $ContentProcessor)
	{
		$this->Automad = $Automad;
		$this->Runtime = $Runtime;
		$this->ContentProcessor = $ContentProcessor;
		$this->featureProcessors = $this->initFeatureProcessors();
	}


	/**
	 * The main template render process basically applies all feature processors to the rendered template.
	 * Note that the $collectSnippetDefinitions parameter controls whether snippets are added to the
	 * snippet collection in order to enable basic inheritance.
	 *
	 * @param string $template
	 * @param string $directory
	 * @param bool $collectSnippetDefinitions
	 * @return string the processed template
	 */
	public function process(string $template, string $directory, bool $collectSnippetDefinitions): string
	{
		$output = PreProcessor::stripWhitespace($template);
		$output = PreProcessor::prepareWrappingStatements($output);

		$output = preg_replace_callback(
			'/' . PatternAssembly::template() . '/is',
			function ($matches) use ($directory, $collectSnippetDefinitions) {
				if (!empty($matches['var'])) {
					return $this->ContentProcessor->processVariables($matches['var'], false, true);
				}

				foreach ($this->featureProcessors as $processor) {
					$featureOutput = $processor->process($matches, $directory, $collectSnippetDefinitions);

					if (!empty($featureOutput)) {
						return $featureOutput;
					}
				}

				return '';
			},
			$output
		);

		return URLProcessor::resolveUrls(
			$output,
			'relativeUrlToBase',
			array($this->Automad->Context->get())
		);
	}


	/**
	 * Create instances of all existing feature processors and bundle them in an array.
	 *
	 * @return array the array of feature processor instances
	 */
	private function initFeatureProcessors(): array
	{
		$processors = array();

		foreach (FeatureProvider::getProcessorClasses() as $cls) {
			$processors[$cls] = new $cls(
				$this->Automad,
				$this->Runtime,
				$this->ContentProcessor
			);
		}

		return $processors;
	}
}
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