<?php

namespace TablePress\PhpOffice\PhpSpreadsheet\Shared;

use TablePress\PhpOffice\PhpSpreadsheet\Exception;
use TablePress\PhpOffice\PhpSpreadsheet\Reader\Exception as ReaderException;
use ZipArchive;

class File
{
	/**
	 * Use Temp or File Upload Temp for temporary files.
	 */
	protected static bool $useUploadTempDirectory = false;

	/**
	 * Set the flag indicating whether the File Upload Temp directory should be used for temporary files.
	 */
	public static function setUseUploadTempDirectory(bool $useUploadTempDir): void
	{
		self::$useUploadTempDirectory = (bool) $useUploadTempDir;
	}

	/**
	 * Get the flag indicating whether the File Upload Temp directory should be used for temporary files.
	 */
	public static function getUseUploadTempDirectory(): bool
	{
		return self::$useUploadTempDirectory;
	}

	// https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT
	// Section 4.3.7
	// Looks like there might be endian-ness considerations
	private const ZIP_FIRST_4 = [
		"\x50\x4b\x03\x04", // what it looks like on my system
		"\x04\x03\x4b\x50", // what it says in documentation
	];

	private static function validateZipFirst4(string $zipFile): bool
	{
		$contents = @file_get_contents($zipFile, false, null, 0, 4);

		return in_array($contents, self::ZIP_FIRST_4, true);
	}

	/**
	 * Verify if a file exists.
	 */
	public static function fileExists(string $filename): bool
	{
		// Sick construction, but it seems that
		// file_exists returns strange values when
		// doing the original file_exists on ZIP archives...
		if (strtolower(substr($filename, 0, 6)) == 'zip://') {
			// Open ZIP file and verify if the file exists
			$zipFile = substr($filename, 6, strrpos($filename, '#') - 6);
			$archiveFile = substr($filename, strrpos($filename, '#') + 1);

			if (self::validateZipFirst4($zipFile)) {
				$zip = new ZipArchive();
				$res = $zip->open($zipFile);
				if ($res === true) {
					$returnValue = ($zip->getFromName($archiveFile) !== false);
					$zip->close();

					return $returnValue;
				}
			}

			return false;
		}

		return file_exists($filename);
	}

	/**
	 * Returns canonicalized absolute pathname, also for ZIP archives.
	 */
	public static function realpath(string $filename): string
	{
		// Returnvalue
		$returnValue = '';

		// Try using realpath()
		if (file_exists($filename)) {
			$returnValue = realpath($filename) ?: '';
		}

		// Found something?
		if ($returnValue === '') {
			$pathArray = explode('/', $filename);
			while (in_array('..', $pathArray) && $pathArray[0] != '..') {
				$iMax = count($pathArray);
				for ($i = 1; $i < $iMax; ++$i) {
					if ($pathArray[$i] == '..') {
						array_splice($pathArray, $i - 1, 2);

						break;
					}
				}
			}
			$returnValue = implode('/', $pathArray);
		}

		// Return
		return $returnValue;
	}

	/**
	 * Get the systems temporary directory.
	 */
	public static function sysGetTempDir(): string
	{
		$path = sys_get_temp_dir();
		if (self::$useUploadTempDirectory) {
			//  use upload-directory when defined to allow running on environments having very restricted
			//      open_basedir configs
			if (ini_get('upload_tmp_dir') !== false) {
				if ($temp = ini_get('upload_tmp_dir')) {
					if (file_exists($temp)) {
						$path = $temp;
					}
				}
			}
		}

		return realpath($path) ?: '';
	}

	public static function temporaryFilename(): string
	{
		$filename = tempnam(self::sysGetTempDir(), 'phpspreadsheet');
		if ($filename === false) {
			throw new Exception('Could not create temporary file');
		}

		return $filename;
	}

	/**
	 * Assert that given path is an existing file and is readable, otherwise throw exception.
	 */
	public static function assertFile(string $filename, string $zipMember = ''): void
	{
		if (!is_file($filename)) {
			throw new ReaderException('File "' . $filename . '" does not exist.');
		}

		if (!is_readable($filename)) {
			throw new ReaderException('Could not open "' . $filename . '" for reading.');
		}

		if ($zipMember !== '') {
			$zipfile = "zip://$filename#$zipMember";
			if (!self::fileExists($zipfile)) {
				// Has the file been saved with Windoze directory separators rather than unix?
				$zipfile = "zip://$filename#" . str_replace('/', '\\', $zipMember);
				if (!self::fileExists($zipfile)) {
					throw new ReaderException("Could not find zip member $zipfile");
				}
			}
		}
	}

	/**
	 * Same as assertFile, except return true/false and don't throw Exception.
	 */
	public static function testFileNoThrow(string $filename, ?string $zipMember = null): bool
	{
		if (!is_file($filename)) {
			return false;
		}
		if (!is_readable($filename)) {
			return false;
		}
		if ($zipMember === null) {
			return true;
		}
		// validate zip, but don't check specific member
		if ($zipMember === '') {
			return self::validateZipFirst4($filename);
		}

		$zipfile = "zip://$filename#$zipMember";
		if (self::fileExists($zipfile)) {
			return true;
		}

		// Has the file been saved with Windoze directory separators rather than unix?
		$zipfile = "zip://$filename#" . str_replace('/', '\\', $zipMember);

		return self::fileExists($zipfile);
	}
}