/**
@file     file_path_tools.h
@brief    Tools for creating and working with file paths
@details  Copyright (c) 2024 Acronis International GmbH
@author   Denis Kopyrin ([email protected])
@since    $Id: $
*/

#pragma once

#include "compat.h"
#include "memory.h"
#include "si_common.h"

typedef struct {
	char* buf;
	SiSizedString str;
} path_info_t;

// init_empty initialize message enough so 'free' can work
static inline void path_info_init_empty(path_info_t* info) {
	info->buf = NULL;
}

static inline long path_info_make_with_alloc_flags(path_info_t* info, const struct path* path, bool dir, bool nowait) {
	const size_t max_path_len = PATH_MAX;
	long ret = -EFAULT;
	char* str;

	info->buf = (char*) mem_alloc_with_alloc_flags(max_path_len, nowait);
	if (!info->buf) {
		goto err;
	}

	str = d_absolute_path_compat(path, info->buf, max_path_len - (dir ? 1 : 0));
	if (IS_ERR(str)) {
    ret = PTR_ERR(str);
		mem_free(info->buf);
		info->buf = NULL;
		goto err;
	}

	info->str.value = str;
	info->str.length = strlen(info->str.value);
	if (dir) {
		if (str[info->str.length - 1] != '/') {
			str[info->str.length] = '/';
			str[info->str.length + 1] = '\0';
			info->str.length++;
		}
	}

	return 0;

err:
	info->str = (SiSizedString) {};
	return ret;
}

static inline long path_info_make(path_info_t* info, const struct path* path, bool dir) {
	return path_info_make_with_alloc_flags(info, path, dir, false /*nowait*/);
}

static inline long path_info_make_nowait(path_info_t* info, const struct path* path, bool dir) {
	return path_info_make_with_alloc_flags(info, path, dir, true /*nowait*/);
}

static inline long path_info_make_from_valid(path_info_t* info, const struct path* path) {
	return path_info_make_with_alloc_flags(info, path, S_ISDIR(path->dentry->d_inode->i_mode), false /*nowait*/);
}

static inline long path_info_make_from_valid_nowait(path_info_t* info, const struct path* path) {
	return path_info_make_with_alloc_flags(info, path, S_ISDIR(path->dentry->d_inode->i_mode), true /*nowait*/);
}

static inline void path_info_free(const path_info_t* info) {
	if (info->buf) {
		mem_free(info->buf);
	}
}