wild_encounter through sub_8082C98

1 files changed, 301 insertions, 0 deletions

diff --git a/src/wild_encounter.c b/src/wild_encounter.c
new file mode 100644
index 000000000..d6d115348
--- /dev/null
+++ b/src/wild_encounter.c
@@ -0,0 +1,301 @@
+#include "global.h"
+#include "random.h"
+#include "wild_encounter.h"
+#include "event_data.h"
+#include "field_player_avatar.h"
+#include "constants/species.h"
+#include "constants/maps.h"
+#include "constants/vars.h"
+#include "constants/abilities.h"
+
+struct UnkStruct_20386D0
+{
+    u8 filler_0[6];
+    u16 unk_6;
+    u8 unk_8;
+    u8 unk_9;
+};
+
+EWRAM_DATA struct UnkStruct_20386D0 gUnknown_20386D0 = {};
+EWRAM_DATA bool8 gUnknown_20386DC = FALSE;
+
+extern const u8 gUnknown_83CA71C[][12];
+
+bool8 UnlockedTanobyOrAreNotInTanoby(void);
+u32 GenerateUnownPersonalityByLetter(u8 letter);
+bool8 sub_808310C(u8 level);
+u16 sub_808322C(void);
+void ApplyFluteEncounterRateMod(u32 *rate);
+void ApplyCleanseTagEncounterRateMod(u32 *rate);
+
+void sub_8082740(bool8 state)
+{
+    gUnknown_20386DC = state;
+}
+
+u8 ChooseWildMonIndex_Land(void)
+{
+    u8 pct = Random() % 100;
+    if (pct < 20)
+        return 0;
+    if (pct >= 20 && pct < 40)
+        return 1;
+    if (pct >= 40 && pct < 50)
+        return 2;
+    if (pct >= 50 && pct < 60)
+        return 3;
+    if (pct >= 60 && pct < 70)
+        return 4;
+    if (pct >= 70 && pct < 80)
+        return 5;
+    if (pct >= 80 && pct < 85)
+        return 6;
+    if (pct >= 85 && pct < 90)
+        return 7;
+    if (pct >= 90 && pct < 94)
+        return 8;
+    if (pct >= 94 && pct < 98)
+        return 9;
+    if (pct == 98)
+        return 10;
+    return 11;
+}
+
+u8 ChooseWildMonIndex_WaterRock(void)
+{
+    u8 pct = Random() % 100;
+    if (pct < 60)
+        return 0;
+    if (pct >= 60 && pct < 90)
+        return 1;
+    if (pct >= 90 && pct < 95)
+        return 2;
+    if (pct >= 95 && pct < 99)
+        return 3;
+    return 4;
+}
+
+u8 ChooseWildMonIndex_Fishing(u8 rod)
+{
+    u8 slot = 0;
+    u8 pct = Random() % 100;
+    switch (rod)
+    {
+    case 0: // old
+        if (pct < 70)
+            slot = 0;
+        else
+            slot = 1;
+        break;
+    case 1:
+        if (pct < 60)
+            slot = 2;
+        if (pct >= 60 && pct < 80)
+            slot = 3;
+        if (pct >= 80 && pct < 100)
+            slot = 4;
+        break;
+    case 2:
+        if (pct < 40)
+            slot = 5;
+        if (pct >= 40 && pct < 80)
+            slot = 6;
+        if (pct >= 80 && pct < 95)
+            slot = 7;
+        if (pct >= 95 && pct < 99)
+            slot = 8;
+        if (pct == 99)
+            slot = 9;
+        break;
+    }
+    return slot;
+}
+
+u8 ChooseWildMonLevel(const struct WildPokemon * info)
+{
+    u8 lo;
+    u8 hi;
+    u8 mod;
+    u8 res;
+    if (info->maxLevel >= info->minLevel)
+    {
+        lo = info->minLevel;
+        hi = info->maxLevel;
+    }
+    else
+    {
+        lo = info->maxLevel;
+        hi = info->minLevel;
+    }
+    mod = hi - lo + 1;
+    res = Random() % mod;
+    return lo + res;
+}
+
+u16 sub_8082934(void)
+{
+    u16 i;
+
+    for (i = 0; ; i++)
+    {
+        const struct WildPokemonHeader *wildHeader = &gWildMonHeaders[i];
+        if (wildHeader->mapGroup == 0xFF)
+            break;
+
+        if (gWildMonHeaders[i].mapGroup == gSaveBlock1Ptr->location.mapGroup &&
+            gWildMonHeaders[i].mapNum == gSaveBlock1Ptr->location.mapNum)
+        {
+            if (gSaveBlock1Ptr->location.mapGroup == MAP_GROUP(SIX_ISLAND_ALTERING_CAVE) &&
+                gSaveBlock1Ptr->location.mapNum == MAP_NUM(SIX_ISLAND_ALTERING_CAVE))
+            {
+                u16 alteringCaveId = VarGet(VAR_ALTERING_CAVE_WILD_SET);
+                if (alteringCaveId > 8)
+                    alteringCaveId = 0;
+
+                i += alteringCaveId;
+            }
+
+            if (!UnlockedTanobyOrAreNotInTanoby())
+                break;
+            return i;
+        }
+    }
+
+    return -1;
+}
+
+bool8 UnlockedTanobyOrAreNotInTanoby(void)
+{
+    if (FlagGet(FLAG_SYS_UNLOCKED_TANOBY_RUINS))
+        return TRUE;
+    if (gSaveBlock1Ptr->location.mapGroup != MAP_GROUP(SEVEN_ISLAND_TANOBY_RUINS_DILFORD_CHAMBER))
+        return TRUE;
+    if (!(gSaveBlock1Ptr->location.mapNum == MAP_NUM(SEVEN_ISLAND_TANOBY_RUINS_MONEAN_CHAMBER)
+    ||  gSaveBlock1Ptr->location.mapNum == MAP_NUM(SEVEN_ISLAND_TANOBY_RUINS_LIPTOO_CHAMBER)
+    ||  gSaveBlock1Ptr->location.mapNum == MAP_NUM(SEVEN_ISLAND_TANOBY_RUINS_WEEPTH_CHAMBER)
+    ||  gSaveBlock1Ptr->location.mapNum == MAP_NUM(SEVEN_ISLAND_TANOBY_RUINS_DILFORD_CHAMBER)
+    ||  gSaveBlock1Ptr->location.mapNum == MAP_NUM(SEVEN_ISLAND_TANOBY_RUINS_SCUFIB_CHAMBER)
+    ||  gSaveBlock1Ptr->location.mapNum == MAP_NUM(SEVEN_ISLAND_TANOBY_RUINS_RIXY_CHAMBER)
+    ||  gSaveBlock1Ptr->location.mapNum == MAP_NUM(SEVEN_ISLAND_TANOBY_RUINS_VIAPOIS_CHAMBER)
+    ))
+        return TRUE;
+    return FALSE;
+}
+
+void GenerateWildMon(u16 species, u8 level, u8 slot)
+{
+    u32 personality;
+    s8 chamber;
+    ZeroEnemyPartyMons();
+    if (species != SPECIES_UNOWN)
+    {
+        CreateMonWithNature(&gEnemyParty[0], species, level, 32, Random() % 25);
+    }
+    else
+    {
+        chamber = gSaveBlock1Ptr->location.mapNum - MAP_NUM(SEVEN_ISLAND_TANOBY_RUINS_MONEAN_CHAMBER);
+        personality = GenerateUnownPersonalityByLetter(gUnknown_83CA71C[chamber][slot]);
+        CreateMon(&gEnemyParty[0], species, level, 32, TRUE, personality, FALSE, 0);
+    }
+}
+
+u32 GenerateUnownPersonalityByLetter(u8 letter)
+{
+    u32 personality;
+    do
+    {
+        personality = (Random() << 16) | Random();
+    } while (GetUnownLetterByPersonalityLoByte(personality) != letter);
+    return personality;
+}
+
+u8 GetUnownLetterByPersonalityLoByte(u32 personality)
+{
+    return (((personality & 0x3000000) >> 18) | ((personality & 0x30000) >> 12) | ((personality & 0x300) >> 6) | (personality & 0x3)) % 0x1C;
+}
+
+bool8 sub_8082AEC(const struct WildPokemonInfo * info, u8 tableIdx, u8 a2)
+{
+    u8 slot = 0;
+    u8 level;
+    switch (tableIdx)
+    {
+    case 0:
+        slot = ChooseWildMonIndex_Land();
+        break;
+    case 1:
+        slot = ChooseWildMonIndex_WaterRock();
+        break;
+    case 2:
+        slot = ChooseWildMonIndex_WaterRock();
+        break;
+    }
+    level = ChooseWildMonLevel(&info->wildPokemon[slot]);
+    if (a2 == 1 && !sub_808310C(level))
+    {
+        return FALSE;
+    }
+    GenerateWildMon(info->wildPokemon[slot].species, level, slot);
+    return TRUE;
+}
+
+u16 sub_8082B64(const struct WildPokemonInfo * info, u8 rod)
+{
+    u8 slot = ChooseWildMonIndex_Fishing(rod);
+    u8 level = ChooseWildMonLevel(&info->wildPokemon[slot]);
+    GenerateWildMon(info->wildPokemon[slot].species, level, slot);
+    return info->wildPokemon[slot].species;
+}
+
+bool8 DoWildEncounterRateDiceRoll(u16 a0)
+{
+    if (sub_808322C() % 1600 < a0)
+        return TRUE;
+    return FALSE;
+}
+
+bool8 sub_8082BCC(u32 encounterRate, bool8 ignoreAbility)
+{
+    encounterRate *= 16;
+    if (TestPlayerAvatarFlags(PLAYER_AVATAR_FLAG_MACH_BIKE | PLAYER_AVATAR_FLAG_ACRO_BIKE))
+        encounterRate = encounterRate * 80 / 100;
+    encounterRate += gUnknown_20386D0.unk_6 * 16 / 200;
+    ApplyFluteEncounterRateMod(&encounterRate);
+    ApplyCleanseTagEncounterRateMod(&encounterRate);
+    if (!ignoreAbility)
+    {
+        switch (gUnknown_20386D0.unk_9)
+        {
+        case 1:
+            encounterRate /= 2;
+            break;
+        case 2:
+            encounterRate *= 2;
+            break;
+        }
+    }
+    if (encounterRate > 1600)
+        encounterRate = 1600;
+    return DoWildEncounterRateDiceRoll(encounterRate);
+}
+
+u8 sub_8082C58(void)
+{
+    gUnknown_20386D0.unk_9 = 0;
+    if (!GetMonData(&gPlayerParty[0], MON_DATA_SANITY_IS_EGG))
+    {
+        u8 ability = GetMonAbility(&gPlayerParty[0]);
+        if (ability == ABILITY_STENCH)
+            gUnknown_20386D0.unk_9 = 1;
+        else if (ability == ABILITY_ILLUMINATE)
+            gUnknown_20386D0.unk_9 = 2;
+    }
+    return gUnknown_20386D0.unk_9;
+}
+
+bool8 sub_8082C98(void)
+{
+    if ((Random() % 100) >= 60)
+        return FALSE;
+    return TRUE;
+}