//    This file is part of Motion Watch.

//    Motion Watch is free software: you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation, either version 3 of the License, or
//    (at your option) any later version.

//    Motion Watch is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU General Public License for more details.

#include "common.h"

string cleanDir(const string &path)
{
    if (path[path.size() - 1] == '/')
    {
        return path.substr(0, path.size() - 1);
    }
    else
    {
        return path;
    }
}

bool createDir(const string &dir)
{
    auto ret = mkdir(dir.c_str(), 0777);

    if (ret == -1)
    {
        return errno == EEXIST;
    }
    else
    {
        return true;
    }
}

bool createDirTree(const string &full_path)
{
    size_t pos = 0;
    auto   ret = true;

    while (ret == true && pos != string::npos)
    {
        pos = full_path.find('/', pos + 1);
        ret = createDir(full_path.substr(0, pos));
    }

    return ret;
}

bool fileExists(const string& name)
{
    return access(name.c_str(), F_OK) != -1;
}

vector<string> lsFilesInDir(const string &path, const string &ext)
{
    vector<string> names;

    for (auto &entry : directory_iterator(path))
    {
        if (entry.is_regular_file())
        {
            auto name = entry.path().filename().string();

            if (ext.empty() || name.ends_with(ext))
            {
                names.push_back(name);
            }
        }
    }

    sort(names.begin(), names.end());

    return names;
}

vector<string> lsDirsInDir(const string &path)
{
    vector<string> names;

    for (auto &entry : directory_iterator(path))
    {
        if (entry.is_directory())
        {
            names.push_back(entry.path().filename().string());
        }
    }

    sort(names.begin(), names.end());

    return names;
}

void enforceMaxDays(const string &dirPath, shared_t *share)
{
    auto names = lsDirsInDir(dirPath);

    while (names.size() > (share->maxDays - 1))
    {
        remove_all(string(cleanDir(dirPath) + "/" + names[0]).c_str());

        names.erase(names.begin());
    }
}

void enforceMaxClips(const string &dirPath, shared_t *share)
{
    auto names = lsDirsInDir(dirPath);

    while ((names.size() * 3) > ((share->maxClips - 1) * 3))
    {
        remove(string(cleanDir(dirPath) + "/" + names[0]).c_str());
        remove(string(cleanDir(dirPath) + "/" + names[1]).c_str());
        remove(string(cleanDir(dirPath) + "/" + names[2]).c_str());

        names.erase(names.begin());
        names.erase(names.begin());
        names.erase(names.begin());
    }
}

string genTimeStr(const char *fmt)
{
    time_t rawtime;

    time(&rawtime);

    auto timeinfo = localtime(&rawtime);

    char ret[50];

    strftime(ret, 50, fmt, timeinfo);

    return string(ret);
}

string genDstFile(const string &dirOut, const char *fmt, const string &ext)
{
    createDirTree(cleanDir(dirOut));

    return cleanDir(dirOut) + string("/") + genTimeStr(fmt) + ext;
}

void rdLine(const string &param, const string &line, string *value)
{
    if (line.rfind(param.c_str(), 0) == 0)
    {
        *value = line.substr(param.size());
    }
}

void rdLine(const string &param, const string &line, int *value)
{
    if (line.rfind(param.c_str(), 0) == 0)
    {
        *value = strtol(line.substr(param.size()).c_str(), NULL, 10);
    }
}

bool rdConf(shared_t *share)
{
    ifstream varFile(share->conf.c_str());

    if (!varFile.is_open())
    {
        share->retCode = ENOENT;

        cerr << "err: Failed to open the config file: " << share->conf << " for reading. please check file permissions or if it exists." << endl;
    }
    else
    {
        string line;

        share->recordUrl.clear();
        share->postCmd.clear();
        share->buffDir.clear();

        share->retCode     = 0;
        share->frameGap    = 10;
        share->pixThresh   = 30;
        share->imgThresh   = 512;
        share->secs        = 60;
        share->maxDays     = 15;
        share->maxClips    = 30;
        share->maxLogLines = 1000;
        share->camName     = path(share->conf.c_str()).filename();
        share->webRoot     = "/var/www/html";
        share->vidExt      = "mp4";
        share->recLoopWait = false;
        share->skipCmd     = false;
        share->webBg       = "#485564";
        share->webTxt      = "#dee5ee";
        share->webFont     = "courier";

        do
        {
            getline(varFile, line);

            if (line.rfind("#", 0) != 0)
            {
                rdLine("cam_name = ",         line, &share->camName);
                rdLine("recording_stream = ", line, &share->recordUrl);
                rdLine("web_root = ",         line, &share->webRoot);
                rdLine("web_text = ",         line, &share->webTxt);
                rdLine("web_bg = ",           line, &share->webBg);
                rdLine("web_font = ",         line, &share->webFont);
                rdLine("post_cmd = ",         line, &share->postCmd);
                rdLine("duration = ",         line, &share->secs);
                rdLine("buff_dir = ",         line, &share->buffDir);
                rdLine("frame_gap = ",        line, &share->frameGap);
                rdLine("pix_thresh = ",       line, &share->pixThresh);
                rdLine("img_thresh = ",       line, &share->imgThresh);
                rdLine("max_days = ",         line, &share->maxDays);
                rdLine("max_clips = ",        line, &share->maxClips);
                rdLine("max_log_lines = ",    line, &share->maxLogLines);
                rdLine("vid_container = ",    line, &share->vidExt);
            }

        } while(!line.empty());

        share->outDir = cleanDir(share->webRoot) + "/" + share->camName;

        if (share->init)
        {
            remove_all(share->buffDir.c_str());

            share->init = false;
        }

        createDirTree(cleanDir(share->buffDir));
        createDirTree(share->outDir);
    }

    varFile.close();

    return share->retCode == 0;
}

string parseForParam(const string &arg, int argc, char** argv, bool argOnly)
{
    for (int i = 0; i < argc; ++i)
    {
        auto argInParams = string(argv[i]);

        if (arg.compare(argInParams) == 0)
        {
            if (!argOnly)
            {
                // check ahead, make sure i + 1 won't cause out-of-range exception
                if ((i + 1) <= (argc - 1))
                {
                    return string(argv[i + 1]);
                }
            }
            else
            {
                return string("true");
            }
        }
    }

    return string();
}