/****************************************************************************
 * Copyright (C) 2010
 * by Dimok
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any
 * damages arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any
 * purpose, including commercial applications, and to alter it and
 * redistribute it freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you
 * must not claim that you wrote the original software. If you use
 * this software in a product, an acknowledgment in the product
 * documentation would be appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and
 * must not be misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source
 * distribution.
 *
 * DirList Class
 * for WiiXplorer 2010
 ***************************************************************************/
#include <algorithm>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string>
#include <strings.h>
#include <sys/dirent.h>
#include <sys/stat.h>

#include <fs/DirList.h>
#include <utils/StringTools.h>

DirList::DirList() {
    Flags  = 0;
    Filter = 0;
    Depth  = 0;
}

DirList::DirList(const std::string &path, const char *filter, uint32_t flags, uint32_t maxDepth) {
    this->LoadPath(path, filter, flags, maxDepth);
    this->SortList();
}

DirList::~DirList() {
    ClearList();
}

BOOL DirList::LoadPath(const std::string &folder, const char *filter, uint32_t flags, uint32_t maxDepth) {
    if (folder.empty())
        return false;

    Flags  = flags;
    Filter = filter;
    Depth  = maxDepth;

    std::string folderpath(folder);
    uint32_t length = folderpath.size();

    //! clear path of double slashes
    StringTools::RemoveDoubleSlashes(folderpath);

    //! remove last slash if exists
    if (length > 0 && folderpath[length - 1] == '/')
        folderpath.erase(length - 1);

    //! add root slash if missing
    if (folderpath.find('/') == std::string::npos) {
        folderpath += '/';
    }

    return InternalLoadPath(folderpath);
}

BOOL DirList::InternalLoadPath(std::string &folderpath) {
    if (folderpath.size() < 3)
        return false;

    struct dirent *dirent = nullptr;
    DIR *dir              = nullptr;

    dir = opendir(folderpath.c_str());
    if (dir == nullptr)
        return false;

    while ((dirent = readdir(dir)) != 0) {
        BOOL isDir           = dirent->d_type & DT_DIR;
        const char *filename = dirent->d_name;

        if (isDir) {
            if (strcmp(filename, ".") == 0 || strcmp(filename, "..") == 0)
                continue;

            if ((Flags & CheckSubfolders) && (Depth > 0)) {
                int32_t length = folderpath.size();
                if (length > 2 && folderpath[length - 1] != '/') {
                    folderpath += '/';
                }
                folderpath += filename;

                Depth--;
                InternalLoadPath(folderpath);
                folderpath.erase(length);
                Depth++;
            }

            if (!(Flags & Dirs))
                continue;
        } else if (!(Flags & Files)) {
            continue;
        }

        if (Filter) {
            char *fileext = strrchr(filename, '.');
            if (!fileext)
                continue;

            if (StringTools::strtokcmp(fileext, Filter, ",") == 0)
                AddEntrie(folderpath, filename, isDir);
        } else {
            AddEntrie(folderpath, filename, isDir);
        }
    }
    closedir(dir);

    return true;
}

void DirList::AddEntrie(const std::string &filepath, const char *filename, BOOL isDir) {
    if (!filename)
        return;

    int32_t pos = FileInfo.size();

    FileInfo.resize(pos + 1);

    FileInfo[pos].FilePath = (char *) malloc(filepath.size() + strlen(filename) + 2);
    if (!FileInfo[pos].FilePath) {
        FileInfo.resize(pos);
        return;
    }

    sprintf(FileInfo[pos].FilePath, "%s/%s", filepath.c_str(), filename);
    FileInfo[pos].isDir = isDir;
}

void DirList::ClearList() {
    for (uint32_t i = 0; i < FileInfo.size(); ++i) {
        if (FileInfo[i].FilePath) {
            free(FileInfo[i].FilePath);
            FileInfo[i].FilePath = nullptr;
        }
    }

    FileInfo.clear();
    std::vector<DirEntry>().swap(FileInfo);
}

const char *DirList::GetFilename(int32_t ind) const {
    if (!valid(ind))
        return "";

    return StringTools::FullpathToFilename(FileInfo[ind].FilePath);
}

static BOOL SortCallback(const DirEntry &f1, const DirEntry &f2) {
    if (f1.isDir && !(f2.isDir))
        return true;
    if (!(f1.isDir) && f2.isDir)
        return false;

    if (f1.FilePath && !f2.FilePath)
        return true;
    if (!f1.FilePath)
        return false;

    if (strcasecmp(f1.FilePath, f2.FilePath) > 0)
        return false;

    return true;
}

void DirList::SortList() {
    if (FileInfo.size() > 1)
        std::sort(FileInfo.begin(), FileInfo.end(), SortCallback);
}

void DirList::SortList(BOOL (*SortFunc)(const DirEntry &a, const DirEntry &b)) {
    if (FileInfo.size() > 1)
        std::sort(FileInfo.begin(), FileInfo.end(), SortFunc);
}

uint64_t DirList::GetFilesize(int32_t index) const {
    struct stat st;
    const char *path = GetFilepath(index);

    if (!path || stat(path, &st) != 0)
        return 0;

    return st.st_size;
}

int32_t DirList::GetFileIndex(const char *filename) const {
    if (!filename)
        return -1;

    for (uint32_t i = 0; i < FileInfo.size(); ++i) {
        if (strcasecmp(GetFilename(i), filename) == 0)
            return i;
    }

    return -1;
}