/*
 * This file is part of the weatherdaemon project.
 * Copyright 2026 Edward V. Emelianov <edward.emelianoff@gmail.com>.
 *
 * 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/>.
 */

// collect here weather from all weatherstations sorted by importance

#include <usefull_macros.h>

#include "mainweather.h"
#include "sensors.h"
#include "weathlib.h"

static pthread_mutex_t datamutex = PTHREAD_MUTEX_INITIALIZER;
static int Forbidden = 0;

// index of meteodata in array
enum{
    NWIND,
    NWINDDIR,
    NHUMIDITY,
    NABM_TEMP,
    NPRESSURE,
    NPRECIP,
    NPRECIP_LEVEL,
    NMIST,
    NCLOUDS,
    NSKYTEMP,
    NCOMMWEATH,
    NLASTAHTUNG,
    NAMOUNT_OF_DATA
};

static val_t collected_data[NAMOUNT_OF_DATA] = {
    [NWIND] = {.sense = VAL_OBLIGATORY, .type = VALT_FLOAT, .meaning = IS_WIND},
    [NWINDDIR] = {.sense = VAL_OBLIGATORY, .type = VALT_FLOAT, .meaning = IS_WINDDIR},
    [NHUMIDITY] = {.sense = VAL_OBLIGATORY, .type = VALT_FLOAT, .meaning = IS_HUMIDITY},
    [NABM_TEMP] = {.sense = VAL_OBLIGATORY, .type = VALT_FLOAT, .meaning = IS_AMB_TEMP},
    [NPRESSURE] = {.sense = VAL_OBLIGATORY, .type = VALT_FLOAT, .meaning = IS_PRESSURE},
    [NPRECIP] = {.sense = VAL_OBLIGATORY, .type = VALT_FLOAT, .meaning = IS_PRECIP},
    [NPRECIP_LEVEL] = {.sense = VAL_OBLIGATORY, .type = VALT_INT,   .meaning = IS_PRECIP_LEVEL},
    [NMIST] = {.sense = VAL_OBLIGATORY, .type = VALT_INT,   .meaning = IS_MIST},
    [NCLOUDS] = {.sense = VAL_OBLIGATORY, .type = VALT_FLOAT,   .meaning = IS_CLOUDS},
    [NSKYTEMP] = {.sense = VAL_OBLIGATORY, .type = VALT_FLOAT, .meaning = IS_SKYTEMP},
    [NCOMMWEATH] = {.value.i = 0, .sense = VAL_OBLIGATORY, .type = VALT_INT,   .meaning = IS_OTHER, .name = "weather", .comment = "Weather level (0 - good, 3 - obs. prohibited)"},
    [NLASTAHTUNG] = {.value.i = 0, .sense = VAL_RECOMMENDED, .type = VALT_INT, .meaning = IS_OTHER, .name = "evttime", .comment = "UNIX-time of last weather level increasing"},
//    {.sense = VAL_OBLIGATORY, .type = VALT_FLOAT, .meaning = IS_OTHER},
};

int collected_amount(){
    return NAMOUNT_OF_DATA;
}

int get_collected(val_t *val, int N){
    if(!val || N < 0 || N >= NAMOUNT_OF_DATA){
        DBG("Wrong number (%d) requested or no place for data", N);
        return FALSE;
    }
    pthread_mutex_lock(&datamutex);
    DBG("Copied data of %d", N);
    *val = collected_data[N];
    pthread_mutex_unlock(&datamutex);
    return TRUE;
}

static void fix_new_data(val_t *collected, val_t *fresh){
    FNAME();
    if(!collected || !fresh) return;
    collected->time = fresh->time;
    if(collected->type == fresh->type){ // good case
        collected->value = fresh->value;
        return;
    }
    // bad case: have different types
    switch(collected->type){
    case VALT_UINT:
        switch(fresh->type){
        case VALT_INT:
            collected->value.u = (uint32_t) collected->value.i;
            break;
        case VALT_FLOAT:
            collected->value.u = (uint32_t) collected->value.f;
        default: break;
        }
        break;
    case VALT_INT:
        switch(fresh->type){
        case VALT_UINT:
            collected->value.i = (int32_t) collected->value.u;
            break;
        case VALT_FLOAT:
            collected->value.i = (int32_t) collected->value.f;
        default: break;
        }
        break;
    case VALT_FLOAT:
        switch(fresh->type){
        case VALT_UINT:
            collected->value.f = (float) collected->value.u;
            break;
        case VALT_INT:
            collected->value.f = (float) collected->value.i;
        default: break;
        }
        break;
    }
}

static void chkweatherlevel(int *curlevel, double curvalue, weather_cond_t *curcond, int *ahtungtime){
    double good = curcond->good, bad = curcond->bad, terrible = curcond->terrible;
    if(curcond->negflag){ // negate
        curvalue = -curvalue;
        good = -good;
        bad = -bad;
        terrible = -terrible;
    }
    int newlevel = -1;
    if(curvalue > terrible) newlevel = WEATHER_TERRIBLE;
    else if(curvalue > bad) newlevel = WEATHER_BAD;
    else if(curvalue < good) newlevel = WEATHER_GOOD;
    if(newlevel == -1) return;
    time_t curt = time(NULL);
    if(newlevel > *curlevel){
        DBG("newlevel: %d, current: %d  INCREASED", newlevel, *curlevel);
        *curlevel = newlevel;
        if(*ahtungtime < curt) *ahtungtime = (int) curt; // refresh event time
    }else{ // check timeout to make level lower
        if(curt - *ahtungtime > WeatherConf.ahtung_delay){
            DBG("newlevel: %d, current: %d  DECREASED", newlevel, *curlevel);
            *curlevel = newlevel;
        }
    }
}

void refresh_sensval(sensordata_t *s){
    FNAME();
    static time_t poll_time = 0;
    val_t value;
    if(!s || !s->get_value) return;
    if(poll_time == 0) poll_time = get_pollT();
    int curlevel = collected_data[NCOMMWEATH].value.i;
    int curahtungtime = collected_data[NLASTAHTUNG].value.i;
    time_t curtime = time(NULL);
    DBG("%d meteo values", s->Nvalues);
    for(int i = 0; i < s->Nvalues; ++i){
        DBG("Try to get %dth value", i);
        if(!s->get_value(s, &value, i)) continue;
        DBG("got value");
        int idx = -1;
        double curvalue;
        weather_cond_t *curcond = NULL;
        switch(value.meaning){
            case IS_WIND:
                idx = NWIND;
                curvalue = (double) value.value.f;
                curcond = &WeatherConf.wind;
                break;
            case IS_WINDDIR:
                idx = NWINDDIR;
                break;
            case IS_HUMIDITY:
                idx = NHUMIDITY;
                curvalue = (double) value.value.f;
                curcond = &WeatherConf.humidity;
                break;
            case IS_AMB_TEMP:
                idx = NABM_TEMP;
                break;
            case IS_PRESSURE:
                idx = NPRESSURE;
                break;
            case IS_PRECIP:
                idx = NPRECIP;
                if(value.value.i && curlevel < WEATHER_TERRIBLE){
                    curlevel = WEATHER_TERRIBLE;
                    curahtungtime = curtime;
                }
                break;
            case IS_PRECIP_LEVEL:
                idx = NPRECIP_LEVEL;
                break;
            case IS_MIST:
                idx = NMIST;
                if(value.value.i && curlevel < WEATHER_TERRIBLE){
                    curahtungtime = curtime;
                    curlevel = WEATHER_TERRIBLE;
                }
                break;
            case IS_CLOUDS:
                idx = NCLOUDS;
                curvalue = (double) value.value.f;
                curcond = &WeatherConf.clouds;
                break;
            case IS_SKYTEMP:
                idx = NSKYTEMP;
                curvalue = (double) value.value.f;
                curcond = &WeatherConf.sky;
                break;
            default : break;
        }
        if(idx < 0 || idx >= NAMOUNT_OF_DATA) continue;
        DBG("IDX=%d", idx);
        time_t freshdelay = (s->PluginNo == 0) ? 0 : poll_time; // use data of less imrortant plugins only if our data is too old
        time_t curmt = collected_data[idx].time + freshdelay;
        if(value.time < curmt){
            DBG("Data too old (value: %zd, curr: %zd", value.time, curmt);
            continue; // old data
        }
        pthread_mutex_lock(&datamutex);
        fix_new_data(&collected_data[idx], &value);
        pthread_mutex_unlock(&datamutex);
        if(!Forbidden && curcond) chkweatherlevel(&curlevel, curvalue, curcond, &curahtungtime);
    }
    DBG("check ahtung");
    pthread_mutex_lock(&datamutex);
    if(Forbidden) collected_data[NCOMMWEATH].value.i = WEATHER_PROHIBITED;
    else collected_data[NCOMMWEATH].value.i = curlevel;
    if(collected_data[NLASTAHTUNG].value.i < curahtungtime) collected_data[NLASTAHTUNG].value.i = curahtungtime;
    collected_data[NCOMMWEATH].time = curtime;
    collected_data[NLASTAHTUNG].time = curtime;
    pthread_mutex_unlock(&datamutex);
    DBG("Refreshed");
}

void forbid_observations(int f){
    if(f) Forbidden = 1;
    else Forbidden = 0;
}

#if 0
// main cycle
void run_mainweather(){
    int N = get_nplugins();
    if(N < 1) return;
    poll_time = get_pollT();
    while(1){
        int nactive = 0;
        pthread_mutex_lock(&datamutex);
        for(int i = N-1; i > -1; --i){ // the most important is the last
            sensordata_t *s = get_plugin(i);
            if(!s || !sensor_alive(s)) continue;
            ++nactive;
        }
        pthread_mutex_unlock(&datamutex);
        if(nactive == 0) break; // no active sensors
        usleep(10000);
    }
    LOGERR("Main weather collector died: all sensors lost");
}
#endif