#include "global.h"
#include "clock.h"
#include "event_data.h"
#include "rtc.h"
#include "time_events.h"
#include "field_specials.h"
#include "lottery_corner.h"
#include "dewford_trend.h"
#include "tv.h"
#include "field_weather.h"
#include "berry.h"
#include "main.h"
#include "overworld.h"
#include "wallclock.h"

static void UpdatePerDay(struct Time *localTime);
static void UpdatePerMinute(struct Time *localTime);

void InitTimeBasedEvents(void)
{
    FlagSet(FLAG_SYS_CLOCK_SET);
    RtcCalcLocalTime();
    gSaveBlock2.lastBerryTreeUpdate = gLocalTime;
    VarSet(VAR_DAYS, gLocalTime.days);
}

void DoTimeBasedEvents(void)
{
    if (FlagGet(FLAG_SYS_CLOCK_SET))
    {
        RtcCalcLocalTime();
        UpdatePerDay(&gLocalTime);
        UpdatePerMinute(&gLocalTime);
    }
}

static void UpdatePerDay(struct Time *localTime)
{
    u16 *varPtr = GetVarPointer(VAR_DAYS);
    int days = *varPtr;
    u16 daysSince;

    if (days != localTime->days && days <= localTime->days)
    {
        daysSince = localTime->days - days;
        ClearDailyFlags();
        UpdateDewfordTrendPerDay(daysSince);
        UpdateTVShowsPerDay(daysSince);
        UpdateWeatherPerDay(daysSince);
        UpdatePartyPokerusTime(daysSince);
        UpdateMirageRnd(daysSince);
        UpdateBirchState(daysSince);
        SetShoalItemFlag(daysSince);
        SetRandomLotteryNumber(daysSince);
        *varPtr = localTime->days;
    }
}

static void UpdatePerMinute(struct Time *localTime)
{
    struct Time difference;
    int minutes;

    CalcTimeDifference(&difference, &gSaveBlock2.lastBerryTreeUpdate, localTime);
    minutes = 24 * 60 * difference.days + 60 * difference.hours + difference.minutes;
    if (minutes != 0)
    {
        if (minutes >= 0)
        {
            BerryTreeTimeUpdate(minutes);
            gSaveBlock2.lastBerryTreeUpdate = *localTime;
        }
    }
}

static void ReturnFromStartWallClock(void)
{
    InitTimeBasedEvents();
    SetMainCallback2(CB2_ReturnToFieldContinueScriptPlayMapMusic);
}

void StartWallClock(void)
{
    SetMainCallback2(CB2_StartWallClock);
    gMain.savedCallback = ReturnFromStartWallClock;
}