/* Copyright 2012 (C) Daniel Richman. License: GNU GPL 3; see LICENSE. */

#include <iostream>
#include <stdexcept>
#include <json/json.h>
#include <ctime>

#include "RFC3339.h"

using namespace std;

void handle_command(const Json::Value &command);

int main(int argc, char **argv)
{
    tzset();

    for (;;)
    {
        char line[1024];
        cin.getline(line, 1024);

        if (line[0] == '\0')
            break;

        Json::Reader reader;
        Json::Value command;

        if (!reader.parse(line, command, false))
            throw runtime_error("JSON parsing failed");

        if (!command.isArray() || !command[0u].isString())
            throw runtime_error("Invalid JSON input");

        handle_command(command);
    }
}

void reply(const Json::Value &what)
{
    Json::FastWriter writer;
    cout << writer.write(what);
}

void handle_command(const Json::Value &command)
{
    string command_name = command[0u].asString();
    string string_arg;
    long long int int_arg = 0;

    if (command_name == "validate_rfc3339" ||
        command_name == "rfc3339_to_timestamp")
    {
        string_arg = command[1u].asString();
    }
    else
    {
        int_arg = command[1u].asLargestInt();
    }

    if (command_name == "validate_rfc3339")
        reply(RFC3339::validate_rfc3339(string_arg));
    else if (command_name == "rfc3339_to_timestamp")
        reply(RFC3339::rfc3339_to_timestamp(string_arg));
    else if (command_name == "timestamp_to_rfc3339_utcoffset")
        reply(RFC3339::timestamp_to_rfc3339_utcoffset(int_arg));
    else if (command_name == "timestamp_to_rfc3339_localoffset")
        reply(RFC3339::timestamp_to_rfc3339_localoffset(int_arg));
    else if (command_name == "now_to_rfc3339_utcoffset")
        reply(RFC3339::now_to_rfc3339_utcoffset());
    else if (command_name == "now_to_rfc3339_localoffset")
        reply(RFC3339::now_to_rfc3339_localoffset());
    else
        throw runtime_error("Command not found");
}