1 files changed, 90 insertions, 0 deletions
diff --git a/src/engine/clock.c b/src/engine/clock.c
new file mode 100644
index 000000000..1f2aac9fd
--- /dev/null
+++ b/src/engine/clock.c
@@ -0,0 +1,90 @@
+#include "global.h"
+#include "clock.h"
+#include "berry.h"
+#include "dewford_trend.h"
+#include "event_data.h"
+#include "field_specials.h"
+#include "field_weather.h"
+#include "lottery_corner.h"
+#include "main.h"
+#include "rom4.h"
+#include "rtc.h"
+#include "time_events.h"
+#include "tv.h"
+#include "wallclock.h"
+
+static void InitTimeBasedEvents(void);
+static void UpdatePerDay(struct Time *time);
+static void UpdatePerMinute(struct Time *time);
+static void ReturnFromStartWallClock(void);
+
+static void InitTimeBasedEvents(void)
+{
+    FlagSet(SYS_CLOCK_SET);
+    RtcCalcLocalTime();
+    gSaveBlock2.lastBerryTreeUpdate = gLocalTime;
+    VarSet(VAR_DAYS, gLocalTime.days);
+}
+
+void DoTimeBasedEvents(void)
+{
+    if (FlagGet(SYS_CLOCK_SET))
+    {
+        RtcCalcLocalTime();
+        UpdatePerDay(&gLocalTime);
+        UpdatePerMinute(&gLocalTime);
+    }
+}
+
+static void UpdatePerDay(struct Time *time)
+{
+    u16 *varPtr = GetVarPointer(VAR_DAYS);
+    int days = *varPtr;
+    u16 newDays;
+
+    if (days != time->days && days <= time->days)
+    {
+        newDays = time->days - days;
+        ClearUpperFlags();
+        UpdateDewfordTrendPerDay(newDays);
+        UpdateTVShowsPerDay(newDays);
+        UpdateWeatherPerDay(newDays);
+        UpdatePartyPokerusTime(newDays);
+        UpdateMirageRnd(newDays);
+        UpdateBirchState(newDays);
+        SetShoalItemFlag(newDays);
+        SetRandomLotteryNumber(newDays);
+        *varPtr = time->days;
+    }
+}
+
+static void UpdatePerMinute(struct Time *time)
+{
+    struct Time newTime;
+    s32 minutes;
+
+    CalcTimeDifference(&newTime, &gSaveBlock2.lastBerryTreeUpdate, time);
+    minutes = 1440 * newTime.days + 60 * newTime.hours + newTime.minutes;
+
+    // there's no way to get the correct assembly other than with this nested if check. so dumb.
+    if (minutes != 0)
+    {
+        if (minutes >= 0)
+        {
+            BerryTreeTimeUpdate(minutes);
+            gSaveBlock2.lastBerryTreeUpdate = *time;
+        }
+    }
+}
+
+static void ReturnFromStartWallClock(void)
+{
+    InitTimeBasedEvents();
+    SetMainCallback2(c2_exit_to_overworld_1_continue_scripts_restart_music);
+}
+
+void StartWallClock(void)
+{
+    SetMainCallback2(CB2_StartWallClock);
+    gMain.savedCallback = ReturnFromStartWallClock;
+}