<?php

namespace Automad\Core;

use Automad\Engine\PatternAssembly;
use Automad\Models\Page;
use Automad\System\Fields;

/**
 * The DataFile class handles the reading of the new JSON formatted files and the legacy data file format.
 *
 * @author Marc Anton Dahmen
 * @copyright Copyright (c) 2023 by Marc Anton Dahmen - https://marcdahmen.de
 * @license MIT license - https://automad.org/license
 */
class DataFile
{
	const FILENAME = 'data';

	/**
	 * Get the data file path for a given page or the shared data.
	 * Legacy formats are supported as well.
	 *
	 * @param Page|null $Page
	 * @return string
	 */
	public static function getFile(?Page $Page = null): string
	{
		$jsonFile = AM_BASE_DIR . AM_DIR_SHARED . '/' . self::FILENAME;
		$legacyFile = AM_BASE_DIR . AM_DIR_SHARED . '/data.txt';

		if ($Page) {
			$jsonFile = FileSystem::fullPagePath($Page->path) . self::FILENAME;
			$legacyFile = FileSystem::fullPagePath($Page->path) . $Page->template . '.txt';
		}

		if (is_readable($jsonFile)) {
			return $jsonFile;
		}

		return $legacyFile;
	}


	/**
	 * Read shared data from disk. If a page path is given, read page data instead.
	 * Legacy formats are supported as well.
	 *
	 * @param string|null $pagePath
	 * @return array|null
	 */
	public static function read(?string $pagePath = null): ?array
	{
		$path = !is_null($pagePath) ? AM_DIR_PAGES . $pagePath : AM_DIR_SHARED;
		$path = rtrim(AM_BASE_DIR . $path, '/') . '/';
		$jsonFile = $path . self::FILENAME;

		if (is_readable($jsonFile)) {
			return (array) FileSystem::readJson($jsonFile, false);
		}

		if (is_null($pagePath)) {
			$data = self::readLegacyFormat($path . 'data.txt');

			self::write($data, $pagePath);
			unlink($path . 'data.txt');

			return $data;
		}

		if ($files = FileSystem::glob("{$path}*.txt")) {
			$legacyFile = $files[0];

			$data = self::readLegacyFormat($legacyFile);
			$data[Fields::TEMPLATE] = str_replace('.txt', '', basename($legacyFile));

			$now = date(Page::DATE_FORMAT);

			$data[Fields::TIME_CREATED] = $now;
			$data[Fields::TIME_LAST_MODIFIED] = $now;

			self::write($data, $pagePath);
			unlink($legacyFile);

			return $data;
		}

		return null;
	}


	/**
	 * Loads and parses a text file.
	 *
	 * First it separates the different blocks into simple key/value pairs.
	 * Then it creates an array of vars by splitting the pairs.
	 *
	 * @param string $file
	 * @return array $vars
	 */
	public static function readLegacyFormat(string $file): array
	{
		$data = array();

		if (!file_exists($file)) {
			return $data;
		}

		$pairs = preg_split(
			'/\n\-+\s*\n(?=' . PatternAssembly::CHAR_CLASS_EDITABLE_VARS . '+\:)/s',
			preg_replace('/\r\n?/', "\n", file_get_contents($file)),
			-1,
			PREG_SPLIT_NO_EMPTY
		);

		foreach ($pairs as $pair) {
			$exploded = explode(':', $pair, 2);

			$key = $exploded[0];
			$value = $exploded[1] ?? '';

			if (strlen($value)) {
				$key = trim($key);
				$value = trim($value);

				if (str_starts_with($key, '+')) {
					$value = json_decode($value, false);
				}

				$data[$key] = $value;
			}
		}

		return $data;
	}


	/**
	 * Write shared data to disk. in case a page is given, write page data instead.
	 * Legacy formats are supported as well.
	 *
	 * @param array $data
	 * @param string|null $pagePath
	 * @return bool
	 */
	public static function write(array $data, ?string $pagePath = null): bool
	{
		$data = array_map(function ($value) {
			if (is_string($value)) {
				return trim($value);
			}

			return $value;
		}, $data);

		$data = array_filter($data, function ($value) {
			if (is_string($value)) {
				return strlen($value);
			}

			return true;
		});

		$path = !is_null($pagePath) ? AM_DIR_PAGES . $pagePath : AM_DIR_SHARED;
		$file = rtrim(AM_BASE_DIR . $path, '/') . '/' . self::FILENAME;

		return FileSystem::writeJson($file, $data);
	}
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MTg0NTExNDkzMDM1NDkyOCA5ODg3OTMzNTU0ODQ1NjE4IDk3MTMxOTUxNDUzNjUxOTI=