decompile time_events

3 files changed, 121 insertions, 3 deletions

diff --git a/src/clock.c b/src/clock.c
index ceb140774..4ec49807c 100644
--- a/src/clock.c
+++ b/src/clock.c
@@ -12,7 +12,7 @@ extern void sub_80FA220(u16);
 extern void sub_80BE8C4(u16);
 extern void sub_8080834(u16);
 extern void UpdatePartyPokerusTime(u16);
-extern void sub_810D2F4(u16);
+extern void UpdateMirageRnd(u16);
 extern void UpdateBirchState(u16);
 extern void sub_810F618(u16);
 
@@ -53,7 +53,7 @@ static void UpdatePerDay(struct Time *time)
         sub_80BE8C4(newDays);
         sub_8080834(newDays);
         UpdatePartyPokerusTime(newDays);
-        sub_810D2F4(newDays);
+        UpdateMirageRnd(newDays);
         UpdateBirchState(newDays);
         sub_810F618(newDays);
         SetRandomLotteryNumber(newDays);
diff --git a/src/rom4.c b/src/rom4.c
index ba1b31348..3d388fd6d 100644
--- a/src/rom4.c
+++ b/src/rom4.c
@@ -932,7 +932,7 @@ void sub_80540D0(s16 *a1, u16 *a2)
 
 void sub_8054164(void)
 {
-    if ((gSaveBlock1.location.mapGroup == 0 && gSaveBlock1.location.mapNum == 45) && !sub_810D32C())
+    if ((gSaveBlock1.location.mapGroup == 0 && gSaveBlock1.location.mapNum == 45) && !IsMirageIslandPresent())
     {
         gUnknown_02029816 = TRUE;
         gUnknown_02029814 = GetMirageIslandMon();
diff --git a/src/time_events.c b/src/time_events.c
new file mode 100644
index 000000000..8cbf52a1a
--- /dev/null
+++ b/src/time_events.c
@@ -0,0 +1,118 @@
+#include "global.h"
+#include "event_data.h"
+#include "pokemon.h"
+#include "rng.h"
+#include "rom4.h"
+#include "rtc.h"
+#include "script.h"
+#include "task.h"
+
+extern bool8 sub_807DDFC(void);
+
+u32 GetMirageRnd(void)
+{
+    u32 hi = VarGet(VAR_MIRAGE_RND_H);
+    u32 lo = VarGet(VAR_MIRAGE_RND_L);
+    return (hi << 16) | lo;
+}
+
+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_light_level_1_2_3_5_or_6(get_map_light_from_warp0()))
+    {
+        RtcCalcLocalTime();
+        if (tide[gLocalTime.hours])
+            FlagSet(SYS_SHOAL_TIDE);
+        else
+            FlagReset(SYS_SHOAL_TIDE);
+    }
+}
+
+static void Task_WaitWeather(u8 taskId)
+{
+    if (sub_807DDFC())
+    {
+        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;
+}