// SPDX-License-Identifier: GPL-2.0-or-later
/**
 *  @file FileFilterMgr.h
 *
 *  @brief Declaration file for FileFilterMgr
 */ 
#pragma once

#include <vector>
#include "UnicodeString.h"
#include "FileFilter.h"

/**
 * @brief Return values for many filter functions.
 */
enum FILTER_RETVALUE
{
	FILTER_OK = 0,  /**< Success */
	FILTER_ERROR_FILEACCESS,  /**< File could not be opened etc. */
	FILTER_NOTFOUND, /**< Filter not found */
};

/**
 * @brief File filter manager for handling filefilters.
 *
 * The FileFilterMgr loads a collection of named file filters from disk,
 * and provides lookup access by name, or array access by index, to these
 * named filters. It also provides test functions for actually using the
 * filters.
 *
 * We are using PCRE for regular expressions. Nice thing in PCRE is it supports
 * UTF-8 unicode, unlike many other libs. For ANSI builds we use just ansi
 * strings, and for unicode we must first convert strings to UTF-8.
 */
class FileFilterMgr
{
private:

public:
	~FileFilterMgr();
	// Reload filter array from specified directory (passed to CFileFind)
	void LoadFromDirectory(const String& dir, const String& szPattern, const String& szExt);
	// Reload an edited filter
	int ReloadFilterFromDisk(FileFilter * pfilter);
	int ReloadFilterFromDisk(const String& szFullPath);
	int AddFilter(const String& szFilterFile);
	void RemoveFilter(const String& szFilterFile);

	// access to array of filters
	int GetFilterCount() const { return (int) m_filters.size(); }
	const String& GetFilterName(int i) const;
	const String& GetFilterName(const FileFilter *pFilter) const;
	const String& GetFilterPath(int i) const;
	const String& GetFilterDesc(int i) const;
	const String& GetFilterDesc(const FileFilter *pFilter) const;
	FileFilter * GetFilterByPath(const String& szFilterName);
	FileFilter * GetFilterByIndex(int i);
	const String& GetFullpath(FileFilter * pfilter) const;

	void DeleteAllFilters();
	void CloneFrom(const FileFilterMgr* fileFilterMgr);

// Implementation methods
protected:
	// Clear the list of known filters
	// Load a filter from a file (if syntax is valid)
	FileFilter * LoadFilterFile(const String& szFilepath, int & errorcode);

// Implementation data
private:
	std::vector<FileFilterPtr> m_filters; /*< List of filters loaded */
};


bool TestAgainstRegList(const std::vector<FileFilterElementPtr> *filterList, const String& szTest);

/**
 * @brief Return name of filter.
 *
 * @param [in] i Index of filter.
 * @return Name of filter in given index.
 */
inline const String& FileFilterMgr::GetFilterName(int i) const
{
	return m_filters[i]->name; 
}

/**
 * @brief Return name of filter.
 * @param [in] pFilter Filter to get name for.
 * @return Given filter's name.
 */
inline const String& FileFilterMgr::GetFilterName(const FileFilter *pFilter) const
{
	return pFilter->name; 
}

/**
 * @brief Return description of filter.
 *
 * @param [in] i Index of filter.
 * @return Description of filter in given index.
 */
inline const String& FileFilterMgr::GetFilterDesc(int i) const
{
	return m_filters[i]->description; 
}

/**
 * @brief Return description of filter.
 * @param [in] pFilter Filter to get description for.
 * @return Given filter's description.
 */
inline const String& FileFilterMgr::GetFilterDesc(const FileFilter *pFilter) const
{
	return pFilter->description;
}

/**
 * @brief Return full path to filter.
 *
 * @param [in] i Index of filter.
 * @return Full path of filter in given index.
 */
inline const String& FileFilterMgr::GetFilterPath(int i) const
{
	return m_filters[i]->fullpath;
}

/**
 * @brief Return full path to filter.
 *
 * @param [in] pFilter Pointer to filter.
 * @return Full path of filter.
 */
inline const String& FileFilterMgr::GetFullpath(FileFilter * pfilter) const
{
	return pfilter->fullpath;
}
