1 files changed, 118 insertions, 0 deletions
diff --git a/src/time_events.c b/src/time_events.c
new file mode 100644
index 000000000..4bd732788
--- /dev/null
+++ b/src/time_events.c
@@ -0,0 +1,118 @@
+#include "global.h"
+#include "time_events.h"
+#include "event_data.h"
+#include "field_weather.h"
+#include "pokemon.h"
+#include "random.h"
+#include "overworld.h"
+#include "rtc.h"
+#include "script.h"
+#include "task.h"
+
+static u32 GetMirageRnd(void)
+{
+    u32 hi = VarGet(VAR_MIRAGE_RND_H);
+    u32 lo = VarGet(VAR_MIRAGE_RND_L);
+    return (hi << 16) | lo;
+}
+
+static void SetMirageRnd(u32 rnd)
+{
+    VarSet(VAR_MIRAGE_RND_H, rnd >> 16);
+    VarSet(VAR_MIRAGE_RND_L, rnd);
+}
+
+// unused
+void InitMirageRnd(void)
+{
+    SetMirageRnd((Random() << 16) | Random());
+}
+
+void UpdateMirageRnd(u16 days)
+{
+    s32 rnd = GetMirageRnd();
+    while (days)
+    {
+        rnd = 1103515245 * rnd + 12345;
+        days--;
+    }
+    SetMirageRnd(rnd);
+}
+
+bool8 IsMirageIslandPresent(void)
+{
+    u16 rnd = GetMirageRnd() >> 16;
+    int i;
+
+    for (i = 0; i < PARTY_SIZE; i++)
+        if (GetMonData(&gPlayerParty[i], MON_DATA_SPECIES) && (GetMonData(&gPlayerParty[i], MON_DATA_PERSONALITY) & 0xFFFF) == rnd)
+            return TRUE;
+
+    return FALSE;
+}
+
+void UpdateShoalTideFlag(void)
+{
+    static const u8 tide[] =
+    {
+        1,
+        1,
+        1,
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        1,
+        1,
+        1,
+        1,
+        1,
+        1,
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        1,
+        1,
+        1,
+    };
+
+    if (is_map_type_1_2_3_5_or_6(get_map_type_from_warp0()))
+    {
+        RtcCalcLocalTime();
+        if (tide[gLocalTime.hours])
+            FlagSet(FLAG_SYS_SHOAL_TIDE);
+        else
+            FlagClear(FLAG_SYS_SHOAL_TIDE);
+    }
+}
+
+static void Task_WaitWeather(u8 taskId)
+{
+    if (IsWeatherChangeComplete())
+    {
+        EnableBothScriptContexts();
+        DestroyTask(taskId);
+    }
+}
+
+void WaitWeather(void)
+{
+    CreateTask(Task_WaitWeather, 80);
+}
+
+void InitBirchState(void)
+{
+    *(u16 *)GetVarPointer(VAR_BIRCH_STATE) = 0;
+}
+
+void UpdateBirchState(u16 days)
+{
+    u16 *state = GetVarPointer(VAR_BIRCH_STATE);
+    *state += days;
+    *state %= 7;
+}