#include <helpers.h>
#include <drogon/drogon.h>
#include <models/period_list.h>

static int
parse_HHMM(const char *begin, uint16_t *h, uint16_t *m)
{
    uint16_t tmp_h, tmp_m;
    char *check = nullptr;

    tmp_h = strtol(begin, &check, 10);
    if(begin == check)
    {
        return 1;
    }

    begin = check + 1;
    tmp_m = strtol(begin, &check, 10);
    if(begin == check)
    {
        return 1;
    }

    *h = tmp_h;
    *m = tmp_m;

    return 0;
}

period_list*
helpers::parse_periods(Json::Value periods_json)
{
    auto result = new period_list();

    for (Json::Value::ArrayIndex i = 0; i != periods_json.size(); i++)
    {
        Json::Value p = periods_json[i];
        if(!(p.isMember("start") && p.isMember("end")))
        {
            continue;
        }
        const char *start_str = p["start"].asCString();
        const char *end_str = p["end"].asCString();

        uint16_t h, m, start, end;

        if(parse_HHMM(start_str, &h, &m))
        {
            continue;
        }
        start = (h * 60) + m;

        if(parse_HHMM(end_str, &h, &m))
        {
            continue;
        }
        end = (h * 60) + m;

        if(start < 0 || start > 24 * 60 || end < 0 || end > 24 * 60)
        {
            continue;
        }
        bool period_overlap = false;
        for(int j = 0; j < result->length; j++)
        {
            if(result->periods[j]->is_in_period(start) || result->periods[j]->is_in_period(end))
            {
                period_overlap = true;
                break;
            }
        }
        if(period_overlap)
        {
            continue;
        }

        result->add_period(start, end);
    }

    return result;
}