/*
 Copyright (C) 2020 Fredrik Öhrström

 This program 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.

 This program 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.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include"dvparser.h"
#include"meters.h"
#include"meters_common_implementation.h"
#include"wmbus.h"
#include"wmbus_utils.h"

#define INFO_CODE_SMOKE 0x0001

struct MeterTSD2 : public virtual MeterCommonImplementation
{
    MeterTSD2(MeterInfo &mi);

    string status();
    bool smokeDetected();
    string previousDate();

private:

    void processContent(Telegram *t);

    private:

    uint16_t info_codes_ {};
    bool error_ {};
    string previous_date_ {};
};

MeterTSD2::MeterTSD2(MeterInfo &mi) :
    MeterCommonImplementation(mi, "tsd2")
{
    setMeterType(MeterType::SmokeDetector);

    setExpectedTPLSecurityMode(TPLSecurityMode::AES_CBC_IV);

    addLinkMode(LinkMode::T1);

    addPrint("status", Quantity::Text,
             [&](){ return status(); },
             "The current status: OK, SMOKE or ERROR.",
             true, true);

    addPrint("prev_date", Quantity::Text,
             [&](){ return previousDate(); },
             "Date of previous billing period.",
             true, true);
}

shared_ptr<Meter> createTSD2(MeterInfo &mi)
{
    return shared_ptr<Meter>(new MeterTSD2(mi));
}

bool MeterTSD2::smokeDetected()
{
    return info_codes_ & INFO_CODE_SMOKE;
}

void MeterTSD2::processContent(Telegram *t)
{
    vector<uchar> data;
    t->extractPayload(&data);

    if(data.empty())
    {
        error_ = true;
        return;
    }

    info_codes_ = data[0];
    error_ = false;
    // Check CRC etc here....

    // Previous date
    uint16_t prev_date = (data[2] << 8) | data[1];
    uint prev_date_day = (prev_date >> 0) & 0x1F;
    uint prev_date_month = (prev_date >> 5) & 0x0F;
    uint prev_date_year = (prev_date >> 9) & 0x3F;
    strprintf(previous_date_, "%d-%02d-%02dT02:00:00Z", prev_date_year+2000, prev_date_month, prev_date_day);

    string prev_date_str;
    strprintf(prev_date_str, "%04x", prev_date);
    uint offset = t->parsed.size() + 1;
    t->explanations.push_back(Explanation(offset, 1, prev_date_str, KindOfData::CONTENT, Understanding::FULL));
    t->addMoreExplanation(offset, " previous date (%s)", previous_date_.c_str());
}

string MeterTSD2::status()
{
    string s;
    bool smoke = info_codes_ & INFO_CODE_SMOKE;
    if (smoke)
    {
        s.append("SMOKE ");
    }

    if (error_)
    {
        s.append("ERROR ");
    }

    if (s.length() > 0)
    {
        s.pop_back();
        return s;
    }
    return "OK";
}

string MeterTSD2::previousDate() {
    return previous_date_;
}