#include "Config.h"
#include "trim.h"
#include <iostream>
#include <fstream>
#include <string>
using namespace std;

Config::Entry::Entry(const string & name)
{
    this->name = name;
    pin = -1;
    on_start = NONE;
    on_exit = NONE;
    on_lock = NONE;
    on_unlock = NONE;
}

Config::Config()
{
    reset();
}

void Config::reset()
{
    port = "LPT1";                  /* default to first parallel port */
    entries.clear();                /* erase any entries previously configured */
}

void Config::read(const char * file)
{
    reset();
    ifstream ifs(file);
    if (ifs.is_open())
    {
        int entry_num = -1;         /* start in "global" section (-1) */
        string line;
        while (!ifs.eof())
        {
            getline(ifs, line);
            line = trim(line);

            if (line == "")         /* skip blank lines */
                continue;

            if (line[0] == ';')     /* skip comments */
                continue;

            /* Look for the beginning of a new entry section */
            if (line[0] == '[' && line[line.size()-1] == ']')
            {
                entries.push_back(Entry(string(line, 1, line.size() - 2)));
                entry_num++;
                continue;
            }

            /* split the line into variable and value parts */
            pair<string, string> parts = split(line);
            if (entry_num == -1)
            {
                if (parts.first == "port")
                {
                    if (parts.second != "")
                    {
                        port = parts.second;
                    }
                }
                else
                {
                    cerr << "Warning: Unrecognized global command: "
                         << line << endl;
                }
            }
            else
            {
                if      (parts.first == "pin")
                {
                    int pin = atoi(parts.second.c_str());
                    if (pin >= 0 && pin <= 7)
                        entries[entry_num].pin = pin;
                    else
                        cerr << "Bad pin #: " << parts.second << endl;
                }
                else if (parts.first == "on_start")
                {
                    entries[entry_num].on_start = parseAction(parts.second);
                }
                else if (parts.first == "on_exit")
                {
                    entries[entry_num].on_exit = parseAction(parts.second);
                }
                else if (parts.first == "on_lock")
                {
                    entries[entry_num].on_lock = parseAction(parts.second);
                }
                else if (parts.first == "on_unlock")
                {
                    entries[entry_num].on_unlock = parseAction(parts.second);
                }
                else
                {
                    cerr << "Warning: Unrecognized entry command: "
                         << line << endl;
                }
            }
        }
    }
    else
    {
        cerr << "Warning: Could not open '" << file << "'" << endl;
    }
}

pair<string, string> Config::split(const string & line)
{
    pair<string, string> res;
    size_t pos = line.find('=');
    if (pos != string::npos)
    {
        res.first = trim(string(line, 0, pos));
        res.second = trim(string(line, pos + 1, line.size() - pos - 1));
    }
    return res;
}

Config::Action Config::parseAction(const string & str)
{
    string s = str;
    Action res = NONE;

    /* lowercase the string */
    for (int sz = s.size(), i = 0; i < sz; i++)
    {
        s[i] = tolower(s[i]);
    }

    if      (s == "on")
        res = ON;
    else if (s == "off")
        res = OFF;
    else if (s == "previous")
        res = PREVIOUS;

    return res;
}