#include "global.h"
#include "main.h"
#include "battle.h"
#include "bg.h"
#include "contest_effect.h"
#include "data.h"
#include "event_data.h"
#include "field_screen_effect.h"
#include "gpu_regs.h"
#include "move_relearner.h"
#include "list_menu.h"
#include "malloc.h"
#include "menu.h"
#include "menu_helpers.h"
#include "menu_specialized.h"
#include "overworld.h"
#include "palette.h"
#include "pokemon_summary_screen.h"
#include "script.h"
#include "sound.h"
#include "sprite.h"
#include "string_util.h"
#include "strings.h"
#include "task.h"
#include "constants/rgb.h"
#include "constants/songs.h"

/*
 * Move relearner state machine
 * ------------------------
 * 
 * Entry point: TeachMoveRelearnerMove
 * 
 * TeachMoveRelearnerMove
 * Task_WaitForFadeOut
 * CB2_InitLearnMove
 *   - Creates moveDisplayArrowTask to listen to right/left buttons.
 *   - Creates moveListScrollArrowTask to listen to up/down buttons.
 *   - Whenever the selected move changes (and once on init), the MoveRelearnerCursorCallback
 *     is called (see sMoveRelearnerMovesListTemplate). That callback will reload the contest
 *     display and battle display windows for the new move. Both are always loaded in
 *     memory, but only the currently active one is copied to VRAM. The exception to this
 *     is the appeal and jam hearts, which are sprites. MoveRelearnerShowHideHearts is called
 *     while reloading the contest display to control them.
 * DoMoveRelearnerMain: MENU_STATE_FADE_TO_BLACK
 * DoMoveRelearnerMain: MENU_STATE_WAIT_FOR_FADE
 *   - Go to MENU_STATE_IDLE_BATTLE_MODE
 * 
 * DoMoveRelearnerMain: MENU_STATE_SETUP_BATTLE_MODE
 * DoMoveRelearnerMain: MENU_STATE_IDLE_BATTLE_MODE
 *   - If the player selected a move (pressed A), go to MENU_STATE_PRINT_TEACH_MOVE_PROMPT.
 *   - If the player cancelled (pressed B), go to MENU_STATE_PRINT_GIVE_UP_PROMPT.
 *   - If the player pressed left or right, swap the move display window to contest mode,
 *     and go to MENU_STATE_SETUP_CONTEST_MODE.
 * 
 * DoMoveRelearnerMain: MENU_STATE_SETUP_CONTEST_MODE
 * DoMoveRelearnerMain: MENU_STATE_IDLE_CONTEST_MODE
 *   - If the player selected a move, go to MENU_STATE_PRINT_TEACH_MOVE_PROMPT.
 *   - If the player cancelled, go to MENU_STATE_PRINT_GIVE_UP_PROMPT
 *   - If the player pressed left or right, swap the move display window to battle mode,
 *     and go to MENU_STATE_SETUP_BATTLE_MODE.
 * 
 * DoMoveRelearnerMain: MENU_STATE_PRINT_TEACH_MOVE_PROMPT
 * DoMoveRelearnerMain: MENU_STATE_TEACH_MOVE_CONFIRM
 *   - Wait for the player to confirm.
 *   - If cancelled, go to either MENU_STATE_SETUP_BATTLE_MODE or MENU_STATE_SETUP_CONTEST_MODE.
 *   - If confirmed and the pokemon had an empty move slot, set VAR_0x8004 to TRUE and go to
 *     MENU_STATE_PRINT_TEXT_THEN_FANFARE.
 *   - If confirmed and the pokemon doesn't have an empty move slot, go to
 *     MENU_STATE_PRINT_TRYING_TO_LEARN_PROMPT.
 * 
 * DoMoveRelearnerMain: MENU_STATE_PRINT_TRYING_TO_LEARN_PROMPT
 * DoMoveRelearnerMain: MENU_STATE_WAIT_FOR_TRYING_TO_LEARN
 * DoMoveRelearnerMain: MENU_STATE_CONFIRM_DELETE_OLD_MOVE
 *   - If the player confirms, go to MENU_STATE_PRINT_WHICH_MOVE_PROMPT.
 *   - If the player cancels, go to MENU_STATE_PRINT_STOP_TEACHING
 * 
 * DoMoveRelearnerMain: MENU_STATE_PRINT_STOP_TEACHING
 * DoMoveRelearnerMain: MENU_STATE_WAIT_FOR_STOP_TEACHING
 * DoMoveRelearnerMain: MENU_STATE_CONFIRM_STOP_TEACHING
 *   - If the player confirms, go to MENU_STATE_CHOOSE_SETUP_STATE.
 *   - If the player cancels, go back to MENU_STATE_PRINT_TRYING_TO_LEARN_PROMPT.
 * 
 * DoMoveRelearnerMain: MENU_STATE_PRINT_WHICH_MOVE_PROMPT
 * DoMoveRelearnerMain: MENU_STATE_SHOW_MOVE_SUMMARY_SCREEN
 *   - Go to ShowSelectMovePokemonSummaryScreen. When done, control returns to
 *     CB2_InitLearnMoveReturnFromSelectMove.
 * 
 * DoMoveRelearnerMain: MENU_STATE_DOUBLE_FANFARE_FORGOT_MOVE
 * DoMoveRelearnerMain: MENU_STATE_PRINT_TEXT_THEN_FANFARE
 * DoMoveRelearnerMain: MENU_STATE_WAIT_FOR_FANFARE
 * DoMoveRelearnerMain: MENU_STATE_WAIT_FOR_A_BUTTON
 * DoMoveRelearnerMain: MENU_STATE_FADE_AND_RETURN
 * DoMoveRelearnerMain: MENU_STATE_RETURN_TO_FIELD
 *   - Clean up and go to CB2_ReturnToField.
 * 
 * DoMoveRelearnerMain: MENU_STATE_PRINT_GIVE_UP_PROMPT
 * DoMoveRelearnerMain: MENU_STATE_GIVE_UP_CONFIRM
 *   - If the player confirms, go to MENU_STATE_FADE_AND_RETURN, and set VAR_0x8004 to FALSE.
 *   - If the player cancels, go to either MENU_STATE_SETUP_BATTLE_MODE or
 *     MENU_STATE_SETUP_CONTEST_MODE.
 * 
 * CB2_InitLearnMoveReturnFromSelectMove:
 *   - Do most of the same stuff as CB2_InitLearnMove.
 * DoMoveRelearnerMain: MENU_STATE_FADE_FROM_SUMMARY_SCREEN
 * DoMoveRelearnerMain: MENU_STATE_TRY_OVERWRITE_MOVE
 *   - If any of the pokemon's existing moves were chosen, overwrite the move and
 *     go to MENU_STATE_DOUBLE_FANFARE_FORGOT_MOVE and set VAR_0x8004 to TRUE.
 *   - If the chosen move is the one the player selected before the summary screen,
 *     go to MENU_STATE_PRINT_STOP_TEACHING.
 * 
 */

#define MENU_STATE_FADE_TO_BLACK 0
#define MENU_STATE_WAIT_FOR_FADE 1
#define MENU_STATE_UNREACHABLE 2
#define MENU_STATE_SETUP_BATTLE_MODE 3
#define MENU_STATE_IDLE_BATTLE_MODE 4
#define MENU_STATE_SETUP_CONTEST_MODE 5
#define MENU_STATE_IDLE_CONTEST_MODE 6
// State 7 is skipped.
#define MENU_STATE_PRINT_TEACH_MOVE_PROMPT 8
#define MENU_STATE_TEACH_MOVE_CONFIRM 9
// States 10 and 11 are skipped.
#define MENU_STATE_PRINT_GIVE_UP_PROMPT 12
#define MENU_STATE_GIVE_UP_CONFIRM 13
#define MENU_STATE_FADE_AND_RETURN 14
#define MENU_STATE_RETURN_TO_FIELD 15
#define MENU_STATE_PRINT_TRYING_TO_LEARN_PROMPT 16
#define MENU_STATE_WAIT_FOR_TRYING_TO_LEARN 17
#define MENU_STATE_CONFIRM_DELETE_OLD_MOVE 18
#define MENU_STATE_PRINT_WHICH_MOVE_PROMPT 19
#define MENU_STATE_SHOW_MOVE_SUMMARY_SCREEN 20
// States 21, 22, and 23 are skipped.
#define MENU_STATE_PRINT_STOP_TEACHING 24
#define MENU_STATE_WAIT_FOR_STOP_TEACHING 25
#define MENU_STATE_CONFIRM_STOP_TEACHING 26
#define MENU_STATE_CHOOSE_SETUP_STATE 27
#define MENU_STATE_FADE_FROM_SUMMARY_SCREEN 28
#define MENU_STATE_TRY_OVERWRITE_MOVE 29
#define MENU_STATE_DOUBLE_FANFARE_FORGOT_MOVE 30
#define MENU_STATE_PRINT_TEXT_THEN_FANFARE 31
#define MENU_STATE_WAIT_FOR_FANFARE 32
#define MENU_STATE_WAIT_FOR_A_BUTTON 33

// The different versions of hearts are selected using animation
// commands.
#define APPEAL_HEART_EMPTY 0
#define APPEAL_HEART_FULL 1
#define JAM_HEART_EMPTY 2
#define JAM_HEART_FULL 3

static EWRAM_DATA struct
{
    u8 state;
    u8 heartSpriteIds[16];              /*0x001*/
    u16 movesToLearn[MAX_MON_MOVES];    /*0x012*/
    u8 filler1A[0x44 - 0x1A];           /*0x01A*/
    u8 partyMon;                        /*0x044*/
    u8 moveSlot;                        /*0x045*/
    struct ListMenuItem menuItems[20];  /*0x048*/
    u8 fillerE8[0x110 - 0xE8];          /*0x0E8*/
    u8 numMenuChoices;                  /*0x110*/
    u8 numToShowAtOnce;                 /*0x111*/
    u8 moveListMenuTask;                    /*0x112*/
    u8 moveListScrollArrowTask;         /*0x113*/
    u8 moveDisplayArrowTask;            /*0x114*/
    u16 scrollOffset;                   /*0x116*/
} *sMoveRelearnerStruct = {0};

static EWRAM_DATA struct {
    u16 listOffset;
    u16 listRow;
    bool8 showContestInfo;
} sMoveRelearnerMenuSate = {0};

static const u16 sMoveRelearnerPaletteData[] = INCBIN_U16("graphics/interface/ui_learn_move.gbapal");

// The arrow sprites in this spritesheet aren't used. The scroll-arrow system provides its own
// arrow sprites.
static const u8 sMoveRelearnerSpriteSheetData[] = INCBIN_U8("graphics/interface/ui_learn_move.4bpp");

static const struct OamData sHeartSpriteOamData =
{
    .y = 0,
    .affineMode = 0,
    .objMode = ST_OAM_OBJ_NORMAL,
    .mosaic = 0,
    .bpp = ST_OAM_4BPP,
    .shape = ST_OAM_SQUARE,
    .x = 0,
    .matrixNum = 0,
    .size = 0,
    .tileNum = 0,
    .priority = 0,
    .paletteNum = 0,
    .affineParam = 0,
};

static const struct OamData sUnusedOam1 =
{
    .y = 0,
    .affineMode = 0,
    .objMode = ST_OAM_OBJ_NORMAL,
    .mosaic = 0,
    .bpp = ST_OAM_4BPP,
    .shape = ST_OAM_V_RECTANGLE,
    .x = 0,
    .matrixNum = 0,
    .size = 0,
    .tileNum = 0,
    .priority = 0,
    .paletteNum = 0,
    .affineParam = 0,
};

static const struct OamData sUnusedOam2 =
{
    .y = 0,
    .affineMode = 0,
    .objMode = ST_OAM_OBJ_NORMAL,
    .mosaic = 0,
    .bpp = ST_OAM_4BPP,
    .shape = ST_OAM_H_RECTANGLE,
    .x = 0,
    .matrixNum = 0,
    .size = 0,
    .tileNum = 0,
    .priority = 0,
    .paletteNum = 0,
    .affineParam = 0,
};

static const struct SpriteSheet sMoveRelearnerSpriteSheet =
{
    .data = sMoveRelearnerSpriteSheetData,
    .size = 0x180,
    .tag = 5525
};

static const struct SpritePalette sMoveRelearnerPalette =
{
    .data = sMoveRelearnerPaletteData,
    .tag = 5526
};

static const struct ScrollArrowsTemplate sDisplayModeArrowsTemplate =
{
    .firstArrowType = SCROLL_ARROW_LEFT,
    .firstX = 27,
    .firstY = 16,
    .secondArrowType = SCROLL_ARROW_RIGHT,
    .secondX = 117,
    .secondY = 16,
    .fullyUpThreshold = -1,
    .fullyDownThreshold = -1,
    .tileTag = 5325,
    .palTag = 5325,
    .palNum = 0,
};

static const struct ScrollArrowsTemplate sMoveListScrollArrowsTemplate =
{
    .firstArrowType = SCROLL_ARROW_UP,
    .firstX = 192,
    .firstY = 8,
    .secondArrowType = SCROLL_ARROW_DOWN,
    .secondX = 192,
    .secondY = 104,
    .fullyUpThreshold = 0,
    .fullyDownThreshold = 0,
    .tileTag = 5425,
    .palTag = 5425,
    .palNum = 0,
};

static const union AnimCmd sHeartSprite_AppealEmptyFrame[] =
{
    ANIMCMD_FRAME(8, 5, FALSE, FALSE),
    ANIMCMD_END
};

static const union AnimCmd sHeartSprite_AppealFullFrame[] =
{
    ANIMCMD_FRAME(9, 5, FALSE, FALSE),
    ANIMCMD_END
};

static const union AnimCmd sHeartSprite_JamEmptyFrame[] =
{
    ANIMCMD_FRAME(10, 5, FALSE, FALSE),
    ANIMCMD_END
};

static const union AnimCmd sHeartSprite_JamFullFrame[] =
{
    ANIMCMD_FRAME(11, 5, FALSE, FALSE),
    ANIMCMD_END
};

static const union AnimCmd *const sHeartSpriteAnimationCommands[] =
{
    [APPEAL_HEART_EMPTY] = sHeartSprite_AppealEmptyFrame,
    [APPEAL_HEART_FULL] = sHeartSprite_AppealFullFrame,
    [JAM_HEART_EMPTY] = sHeartSprite_JamEmptyFrame,
    [JAM_HEART_FULL] = sHeartSprite_JamFullFrame,
};

static const struct SpriteTemplate sConstestMoveHeartSprite =
{
    .tileTag = 5525,
    .paletteTag = 5526,
    .oam = &sHeartSpriteOamData,
    .anims = sHeartSpriteAnimationCommands,
    .images = NULL,
    .affineAnims = gDummySpriteAffineAnimTable,
    .callback = SpriteCallbackDummy
};

static const struct BgTemplate sMoveRelearnerMenuBackgroundTemplates[] =
{
    {
        .bg = 0,
        .charBaseIndex = 0,
        .mapBaseIndex = 31,
        .screenSize = 0,
        .paletteMode = 0,
        .priority = 0,
        .baseTile = 0,
    },
    {
        .bg = 1,
        .charBaseIndex = 0,
        .mapBaseIndex = 30,
        .screenSize = 0,
        .paletteMode = 0,
        .priority = 1,
        .baseTile = 0,
    },
};

static void DoMoveRelearnerMain(void);
static void CreateLearnableMovesList(void);
static void CreateUISprites(void);
static void CB2_MoveRelearnerMain(void);
static void Task_WaitForFadeOut(u8 taskId);
static void CB2_InitLearnMove(void);
static void CB2_InitLearnMoveReturnFromSelectMove(void);
static void InitMoveRelearnerBackgroundLayers(void);
static void AddScrollArrows(void);
static void HandleInput(u8);
static void ShowTeachMoveText(u8);
static s32 GetCurrentSelectedMove(void);
static void FreeMoveRelearnerResources(void);
static void RemoveScrollArrows(void);
static void HideHeartSpritesAndShowTeachMoveText(bool8);

static void VBlankCB_MoveRelearner(void)
{
    LoadOam();
    ProcessSpriteCopyRequests();
    TransferPlttBuffer();
}

// Script arguments: The pokemon to teach is in VAR_0x8004
void TeachMoveRelearnerMove(void)
{
    ScriptContext2_Enable();
    CreateTask(Task_WaitForFadeOut, 10);
    // Fade to black
    BeginNormalPaletteFade(0xFFFFFFFF, 0, 0, 0x10, RGB_BLACK);
}

static void Task_WaitForFadeOut(u8 taskId)
{
    if (!gPaletteFade.active)
    {
        SetMainCallback2(CB2_InitLearnMove);
        gFieldCallback = FieldCallback_ReturnToEventScript2;
        DestroyTask(taskId);
    }
}

static void CB2_InitLearnMove(void)
{
    ResetSpriteData();
    FreeAllSpritePalettes();
    ResetTasks();
    clear_scheduled_bg_copies_to_vram();
    sMoveRelearnerStruct = AllocZeroed(sizeof(*sMoveRelearnerStruct));
    sMoveRelearnerStruct->partyMon = gSpecialVar_0x8004;
    SetVBlankCallback(VBlankCB_MoveRelearner);

    InitMoveRelearnerBackgroundLayers();
    InitMoveRelearnerWindows(FALSE);

    sMoveRelearnerMenuSate.listOffset = 0;
    sMoveRelearnerMenuSate.listRow = 0;
    sMoveRelearnerMenuSate.showContestInfo = FALSE;

    CreateLearnableMovesList();

    LoadSpriteSheet(&sMoveRelearnerSpriteSheet);
    LoadSpritePalette(&sMoveRelearnerPalette);
    CreateUISprites();

    sMoveRelearnerStruct->moveListMenuTask = ListMenuInit(&gMultiuseListMenuTemplate, sMoveRelearnerMenuSate.listOffset, sMoveRelearnerMenuSate.listRow);
    FillPalette(RGB_BLACK, 0, 2);
    SetMainCallback2(CB2_MoveRelearnerMain);
}

static void CB2_InitLearnMoveReturnFromSelectMove(void)
{
    ResetSpriteData();
    FreeAllSpritePalettes();
    ResetTasks();
    clear_scheduled_bg_copies_to_vram();
    sMoveRelearnerStruct = AllocZeroed(sizeof(*sMoveRelearnerStruct));
    sMoveRelearnerStruct->state = MENU_STATE_FADE_FROM_SUMMARY_SCREEN;
    sMoveRelearnerStruct->partyMon = gSpecialVar_0x8004;
    sMoveRelearnerStruct->moveSlot = gSpecialVar_0x8005;
    SetVBlankCallback(VBlankCB_MoveRelearner);

    InitMoveRelearnerBackgroundLayers();
    InitMoveRelearnerWindows(sMoveRelearnerMenuSate.showContestInfo);
    CreateLearnableMovesList();

    LoadSpriteSheet(&sMoveRelearnerSpriteSheet);
    LoadSpritePalette(&sMoveRelearnerPalette);
    CreateUISprites();

    sMoveRelearnerStruct->moveListMenuTask = ListMenuInit(&gMultiuseListMenuTemplate, sMoveRelearnerMenuSate.listOffset, sMoveRelearnerMenuSate.listRow);
    FillPalette(RGB_BLACK, 0, 2);
    SetMainCallback2(CB2_MoveRelearnerMain);
}

static void InitMoveRelearnerBackgroundLayers(void)
{
    ResetVramOamAndBgCntRegs();
    ResetBgsAndClearDma3BusyFlags(0);
    InitBgsFromTemplates(0, sMoveRelearnerMenuBackgroundTemplates, ARRAY_COUNT(sMoveRelearnerMenuBackgroundTemplates));
    ResetAllBgsCoordinates();
    SetGpuReg(REG_OFFSET_DISPCNT, DISPCNT_MODE_0 |
                                  DISPCNT_OBJ_1D_MAP |
                                  DISPCNT_OBJ_ON);
    ShowBg(0);
    ShowBg(1);
    SetGpuReg(REG_OFFSET_BLDCNT, 0);
}

static void CB2_MoveRelearnerMain(void)
{
    DoMoveRelearnerMain();
    RunTasks();
    AnimateSprites();
    BuildOamBuffer();
    do_scheduled_bg_tilemap_copies_to_vram();
    UpdatePaletteFade();
}

static void FormatAndPrintText(const u8 *src)
{
    StringExpandPlaceholders(gStringVar4, src);
    MoveRelearnerPrintText(gStringVar4);
}

// See the state machine doc at the top of the file.
static void DoMoveRelearnerMain(void)
{
    switch (sMoveRelearnerStruct->state)
    {
    case MENU_STATE_FADE_TO_BLACK:
        sMoveRelearnerStruct->state++;
        HideHeartSpritesAndShowTeachMoveText(FALSE);
        BeginNormalPaletteFade(0xFFFFFFFF, 0, 16, 0, RGB_BLACK);
        break;
    case MENU_STATE_WAIT_FOR_FADE:
        if (!gPaletteFade.active)
        {
            sMoveRelearnerStruct->state = MENU_STATE_IDLE_BATTLE_MODE;
        }
        break;
    case MENU_STATE_UNREACHABLE:
        sMoveRelearnerStruct->state++;
        break;
    case MENU_STATE_SETUP_BATTLE_MODE:

        HideHeartSpritesAndShowTeachMoveText(FALSE);
        sMoveRelearnerStruct->state++;
        AddScrollArrows();
        break;
    case MENU_STATE_IDLE_BATTLE_MODE:
        HandleInput(FALSE);
        break;
    case MENU_STATE_SETUP_CONTEST_MODE:
        ShowTeachMoveText(FALSE);
        sMoveRelearnerStruct->state++;
        AddScrollArrows();
        break;
    case MENU_STATE_IDLE_CONTEST_MODE:
        HandleInput(TRUE);
        break;
    case MENU_STATE_PRINT_TEACH_MOVE_PROMPT:
        if (!MoveRelearnerRunTextPrinters())
        {
            MoveRelearnerCreateYesNoMenu();
            sMoveRelearnerStruct->state++;
        }
        break;
    case MENU_STATE_TEACH_MOVE_CONFIRM:
        {
            s8 selection = Menu_ProcessInputNoWrapClearOnChoose();

            if (selection == 0)
            {
                if (GiveMoveToMon(&gPlayerParty[sMoveRelearnerStruct->partyMon], GetCurrentSelectedMove()) != MON_HAS_MAX_MOVES)
                {
                    FormatAndPrintText(gText_MoveRelearnerPkmnLearnedMove);
                    gSpecialVar_0x8004 = TRUE;
                    sMoveRelearnerStruct->state = MENU_STATE_PRINT_TEXT_THEN_FANFARE;
                }
                else
                {
                    sMoveRelearnerStruct->state = MENU_STATE_PRINT_TRYING_TO_LEARN_PROMPT;
                }
            }
            else if (selection == MENU_B_PRESSED || selection == 1)
            {
                if (sMoveRelearnerMenuSate.showContestInfo == FALSE)
                {
                    sMoveRelearnerStruct->state = MENU_STATE_SETUP_BATTLE_MODE;
                }
                else if (sMoveRelearnerMenuSate.showContestInfo == TRUE)
                {
                    sMoveRelearnerStruct->state = MENU_STATE_SETUP_CONTEST_MODE;
                }
            }
        }
        break;
    case MENU_STATE_PRINT_GIVE_UP_PROMPT:
        if (!MoveRelearnerRunTextPrinters())
        {
            MoveRelearnerCreateYesNoMenu();
            sMoveRelearnerStruct->state++;
        }
        break;
    case MENU_STATE_GIVE_UP_CONFIRM:
        {
            s8 selection = Menu_ProcessInputNoWrapClearOnChoose();

            if (selection == 0)
            {
                gSpecialVar_0x8004 = FALSE;
                sMoveRelearnerStruct->state = MENU_STATE_FADE_AND_RETURN;
            }
            else if (selection == -1 || selection == 1)
            {
                if (sMoveRelearnerMenuSate.showContestInfo == FALSE)
                {
                    sMoveRelearnerStruct->state = MENU_STATE_SETUP_BATTLE_MODE;
                }
                else if (sMoveRelearnerMenuSate.showContestInfo == TRUE)
                {
                    sMoveRelearnerStruct->state = MENU_STATE_SETUP_CONTEST_MODE;
                }
            }
        }
        break;
    case MENU_STATE_PRINT_TRYING_TO_LEARN_PROMPT:
        FormatAndPrintText(gText_MoveRelearnerPkmnTryingToLearnMove);
        sMoveRelearnerStruct->state++;
        break;
    case MENU_STATE_WAIT_FOR_TRYING_TO_LEARN:
        if (!MoveRelearnerRunTextPrinters())
        {
            MoveRelearnerCreateYesNoMenu();
            sMoveRelearnerStruct->state = MENU_STATE_CONFIRM_DELETE_OLD_MOVE;
        }
        break;
    case MENU_STATE_CONFIRM_DELETE_OLD_MOVE:
        {
            s8 var = Menu_ProcessInputNoWrapClearOnChoose();

            if (var == 0)
            {
                FormatAndPrintText(gText_MoveRelearnerWhichMoveToForget);
                sMoveRelearnerStruct->state = MENU_STATE_PRINT_WHICH_MOVE_PROMPT;
            }
            else if (var == -1 || var == 1)
            {
                sMoveRelearnerStruct->state = MENU_STATE_PRINT_STOP_TEACHING;
            }
        }
        break;
    case MENU_STATE_PRINT_STOP_TEACHING:
        StringCopy(gStringVar2, gMoveNames[GetCurrentSelectedMove()]);
        FormatAndPrintText(gText_MoveRelearnerStopTryingToTeachMove);
        sMoveRelearnerStruct->state++;
        break;
    case MENU_STATE_WAIT_FOR_STOP_TEACHING:
        if (!MoveRelearnerRunTextPrinters())
        {
            MoveRelearnerCreateYesNoMenu();
            sMoveRelearnerStruct->state++;
        }
        break;
    case MENU_STATE_CONFIRM_STOP_TEACHING:
        {
            s8 var = Menu_ProcessInputNoWrapClearOnChoose();

            if (var == 0)
            {
                sMoveRelearnerStruct->state = MENU_STATE_CHOOSE_SETUP_STATE;
            }
            else if (var == MENU_B_PRESSED || var == 1)
            {
                // What's the point? It gets set to MENU_STATE_PRINT_TRYING_TO_LEARN_PROMPT, anyway.
                if (sMoveRelearnerMenuSate.showContestInfo == FALSE)
                {
                    sMoveRelearnerStruct->state = MENU_STATE_SETUP_BATTLE_MODE;
                }
                else if (sMoveRelearnerMenuSate.showContestInfo == TRUE)
                {
                    sMoveRelearnerStruct->state = MENU_STATE_SETUP_CONTEST_MODE;
                }
                sMoveRelearnerStruct->state = MENU_STATE_PRINT_TRYING_TO_LEARN_PROMPT;
            }
        }
        break;
    case MENU_STATE_CHOOSE_SETUP_STATE:
        if (!MoveRelearnerRunTextPrinters())
        {
            FillWindowPixelBuffer(3, 0x11);
            if (sMoveRelearnerMenuSate.showContestInfo == FALSE)
            {
                sMoveRelearnerStruct->state = MENU_STATE_SETUP_BATTLE_MODE;
            }
            else if (sMoveRelearnerMenuSate.showContestInfo == TRUE)
            {
                sMoveRelearnerStruct->state = MENU_STATE_SETUP_CONTEST_MODE;
            }
        }
        break;
    case MENU_STATE_PRINT_WHICH_MOVE_PROMPT:
        if (!MoveRelearnerRunTextPrinters())
        {
            sMoveRelearnerStruct->state = MENU_STATE_SHOW_MOVE_SUMMARY_SCREEN;
            BeginNormalPaletteFade(0xFFFFFFFF, 0, 0, 16, RGB_BLACK);
        }
        break;
    case MENU_STATE_SHOW_MOVE_SUMMARY_SCREEN:
        if (!gPaletteFade.active)
        {
            ShowSelectMovePokemonSummaryScreen(gPlayerParty, sMoveRelearnerStruct->partyMon, gPlayerPartyCount - 1, CB2_InitLearnMoveReturnFromSelectMove, GetCurrentSelectedMove());
            FreeMoveRelearnerResources();
        }
        break;
    case 21:
        if (!MoveRelearnerRunTextPrinters())
        {
            sMoveRelearnerStruct->state = MENU_STATE_FADE_AND_RETURN;
        }
        break;
    case 22:
        BeginNormalPaletteFade(0xFFFFFFFF, 0, 16, 0, RGB_BLACK);
        break;
    case MENU_STATE_FADE_AND_RETURN:
        BeginNormalPaletteFade(0xFFFFFFFF, 0, 0, 16, RGB_BLACK);
        sMoveRelearnerStruct->state++;
        break;
    case MENU_STATE_RETURN_TO_FIELD:
        if (!gPaletteFade.active)
        {
            FreeMoveRelearnerResources();
            SetMainCallback2(CB2_ReturnToField);
        }
        break;
    case MENU_STATE_FADE_FROM_SUMMARY_SCREEN:
        BeginNormalPaletteFade(0xFFFFFFFF, 0, 16, 0, RGB_BLACK);
        sMoveRelearnerStruct->state++;
        if (sMoveRelearnerMenuSate.showContestInfo == FALSE)
        {
            HideHeartSpritesAndShowTeachMoveText(TRUE);
        }
        else if (sMoveRelearnerMenuSate.showContestInfo == TRUE)
        {
            ShowTeachMoveText(TRUE);
        }
        RemoveScrollArrows();
        CopyWindowToVram(3, 2);
        break;
    case MENU_STATE_TRY_OVERWRITE_MOVE:
        if (!gPaletteFade.active)
        {
            if (sMoveRelearnerStruct->moveSlot == MAX_MON_MOVES)
            {
                sMoveRelearnerStruct->state = MENU_STATE_PRINT_STOP_TEACHING;
            }
            else
            {
                u16 moveId = GetMonData(&gPlayerParty[sMoveRelearnerStruct->partyMon], MON_DATA_MOVE1 + sMoveRelearnerStruct->moveSlot);

                StringCopy(gStringVar3, gMoveNames[moveId]);
                RemoveMonPPBonus(&gPlayerParty[sMoveRelearnerStruct->partyMon], sMoveRelearnerStruct->moveSlot);
                SetMonMoveSlot(&gPlayerParty[sMoveRelearnerStruct->partyMon], GetCurrentSelectedMove(), sMoveRelearnerStruct->moveSlot);
                StringCopy(gStringVar2, gMoveNames[GetCurrentSelectedMove()]);
                FormatAndPrintText(gText_MoveRelearnerAndPoof);
                sMoveRelearnerStruct->state = MENU_STATE_DOUBLE_FANFARE_FORGOT_MOVE;
                gSpecialVar_0x8004 = TRUE;
            }
        }
        break;
    case MENU_STATE_DOUBLE_FANFARE_FORGOT_MOVE:
        if (!MoveRelearnerRunTextPrinters())
        {
            FormatAndPrintText(gText_MoveRelearnerPkmnForgotMoveAndLearnedNew);
            sMoveRelearnerStruct->state = MENU_STATE_PRINT_TEXT_THEN_FANFARE;
            PlayFanfare(MUS_FANFA1);
        }
        break;
    case MENU_STATE_PRINT_TEXT_THEN_FANFARE:
        if (!MoveRelearnerRunTextPrinters())
        {
            PlayFanfare(MUS_FANFA1);
            sMoveRelearnerStruct->state = MENU_STATE_WAIT_FOR_FANFARE;
        }
        break;
    case MENU_STATE_WAIT_FOR_FANFARE:
        if (IsFanfareTaskInactive())
        {
            sMoveRelearnerStruct->state = MENU_STATE_WAIT_FOR_A_BUTTON;
        }
        break;
    case MENU_STATE_WAIT_FOR_A_BUTTON:
        if (gMain.newKeys & A_BUTTON)
        {
            PlaySE(SE_SELECT);
            sMoveRelearnerStruct->state = MENU_STATE_FADE_AND_RETURN;
        }
        break;
    }
}

static void FreeMoveRelearnerResources(void)
{
    RemoveScrollArrows();
    DestroyListMenuTask(sMoveRelearnerStruct->moveListMenuTask, &sMoveRelearnerMenuSate.listOffset, &sMoveRelearnerMenuSate.listRow);
    FreeAllWindowBuffers();
    FREE_AND_SET_NULL(sMoveRelearnerStruct);
    ResetSpriteData();
    FreeAllSpritePalettes();
}

// Note: The hearts are already made invisible by MoveRelearnerShowHideHearts,
// which is called whenever the cursor in either list changes.
static void HideHeartSpritesAndShowTeachMoveText(bool8 onlyHideSprites)
{
    s32 i;

    for (i = 0; i < 16; i++)
    {
        gSprites[sMoveRelearnerStruct->heartSpriteIds[i]].invisible = TRUE;
    }

    if (!onlyHideSprites)
    {
        StringExpandPlaceholders(gStringVar4, gText_TeachWhichMoveToPkmn);
        FillWindowPixelBuffer(3, 0x11);
        AddTextPrinterParameterized(3, 1, gStringVar4, 0, 1, 0, NULL);
    }
}

static void HandleInput(bool8 showContest)
{
    s32 itemId = ListMenu_ProcessInput(sMoveRelearnerStruct->moveListMenuTask);
    ListMenuGetScrollAndRow(sMoveRelearnerStruct->moveListMenuTask, &sMoveRelearnerMenuSate.listOffset, &sMoveRelearnerMenuSate.listRow);

    switch (itemId)
    {
    case LIST_NOTHING_CHOSEN:
        if (!(gMain.newKeys & (DPAD_LEFT | DPAD_RIGHT)) && !GetLRKeysPressed())
        {
            break;
        }

        PlaySE(SE_SELECT);

        if (showContest == FALSE)
        {
            PutWindowTilemap(1);
            sMoveRelearnerStruct->state = MENU_STATE_SETUP_CONTEST_MODE;
            sMoveRelearnerMenuSate.showContestInfo = TRUE;
        }
        else
        {
            PutWindowTilemap(0);
            sMoveRelearnerStruct->state = MENU_STATE_SETUP_BATTLE_MODE;
            sMoveRelearnerMenuSate.showContestInfo = FALSE;
        }

        schedule_bg_copy_tilemap_to_vram(1);
        MoveRelearnerShowHideHearts(GetCurrentSelectedMove());
        break;
    case LIST_CANCEL:
        PlaySE(SE_SELECT);
        RemoveScrollArrows();
        sMoveRelearnerStruct->state = MENU_STATE_PRINT_GIVE_UP_PROMPT;
        StringExpandPlaceholders(gStringVar4, gText_MoveRelearnerGiveUp);
        MoveRelearnerPrintText(gStringVar4);
        break;
    default:
        PlaySE(SE_SELECT);
        RemoveScrollArrows();
        sMoveRelearnerStruct->state = MENU_STATE_PRINT_TEACH_MOVE_PROMPT;
        StringCopy(gStringVar2, gMoveNames[itemId]);
        StringExpandPlaceholders(gStringVar4, gText_MoveRelearnerTeachMoveConfirm);
        MoveRelearnerPrintText(gStringVar4);
        break;
    }
}

static s32 GetCurrentSelectedMove(void)
{
    return sMoveRelearnerStruct->menuItems[sMoveRelearnerMenuSate.listRow + sMoveRelearnerMenuSate.listOffset].id;
}

// Theory: This used to make the heart sprites visible again (i.e.
// this was the inverse of HideHeartsAndShowTeachMoveText), but the
// code was commented out. The bool argument would have been named
// "justShowHearts." The code for showing/hiding the heards was moved
// to MoveRelearnerShowHideHearts, which is called whenever a new move is
// selected and whenever the display mode changes.
static void ShowTeachMoveText(bool8 shouldDoNothingInstead)
{
    if (shouldDoNothingInstead == FALSE)
    {
        StringExpandPlaceholders(gStringVar4, gText_TeachWhichMoveToPkmn);
        FillWindowPixelBuffer(3, 0x11);
        AddTextPrinterParameterized(3, 1, gStringVar4, 0, 1, 0, NULL);
    }
}

static void CreateUISprites(void)
{
    int i;

    sMoveRelearnerStruct->moveDisplayArrowTask = 0xFF;
    sMoveRelearnerStruct->moveListScrollArrowTask = 0xFF;
    AddScrollArrows();

    // These are the appeal hearts.
    for (i = 0; i < 8; i++)
    {
        sMoveRelearnerStruct->heartSpriteIds[i] = CreateSprite(&sConstestMoveHeartSprite, (i - (i / 4) * 4) * 8 + 104, (i / 4) * 8 + 36, 0);
    }

    // These are the jam harts.
    // The animation is used to toggle between full/empty heart sprites.
    for (i = 0; i < 8; i++)
    {
        sMoveRelearnerStruct->heartSpriteIds[i + 8] = CreateSprite(&sConstestMoveHeartSprite, (i - (i / 4) * 4) * 8 + 104, (i / 4) * 8 + 52, 0);
        StartSpriteAnim(&gSprites[sMoveRelearnerStruct->heartSpriteIds[i + 8]], 2);
    }

    for (i = 0; i < 16; i++)
    {
        gSprites[sMoveRelearnerStruct->heartSpriteIds[i]].invisible = TRUE;
    }
}

static void AddScrollArrows(void)
{
    if (sMoveRelearnerStruct->moveDisplayArrowTask == 0xFF)
    {
        sMoveRelearnerStruct->moveDisplayArrowTask = AddScrollIndicatorArrowPair(&sDisplayModeArrowsTemplate, &sMoveRelearnerStruct->scrollOffset);
    }

    if (sMoveRelearnerStruct->moveListScrollArrowTask == 0xFF)
    {
        gTempScrollArrowTemplate = sMoveListScrollArrowsTemplate;
        gTempScrollArrowTemplate.fullyDownThreshold = sMoveRelearnerStruct->numMenuChoices - sMoveRelearnerStruct->numToShowAtOnce;
        sMoveRelearnerStruct->moveListScrollArrowTask = AddScrollIndicatorArrowPair(&gTempScrollArrowTemplate, &sMoveRelearnerMenuSate.listOffset);
    }
}

static void RemoveScrollArrows(void)
{
    if (sMoveRelearnerStruct->moveDisplayArrowTask != 0xFF)
    {
        RemoveScrollIndicatorArrowPair(sMoveRelearnerStruct->moveDisplayArrowTask);
        sMoveRelearnerStruct->moveDisplayArrowTask = 0xFF;
    }

    if (sMoveRelearnerStruct->moveListScrollArrowTask != 0xFF)
    {
        RemoveScrollIndicatorArrowPair(sMoveRelearnerStruct->moveListScrollArrowTask);
        sMoveRelearnerStruct->moveListScrollArrowTask = 0xFF;
    }
}

static void CreateLearnableMovesList(void)
{
    s32 i;
    u8 nickname[POKEMON_NAME_LENGTH + 1];

    sMoveRelearnerStruct->numMenuChoices = GetMoveRelearnerMoves(&gPlayerParty[sMoveRelearnerStruct->partyMon], sMoveRelearnerStruct->movesToLearn);

    for (i = 0; i < sMoveRelearnerStruct->numMenuChoices; i++)
    {
        sMoveRelearnerStruct->menuItems[i].name = gMoveNames[sMoveRelearnerStruct->movesToLearn[i]];
        sMoveRelearnerStruct->menuItems[i].id = sMoveRelearnerStruct->movesToLearn[i];
    }

    GetMonData(&gPlayerParty[sMoveRelearnerStruct->partyMon], MON_DATA_NICKNAME, nickname);
    StringCopy10(gStringVar1, nickname);
    sMoveRelearnerStruct->menuItems[sMoveRelearnerStruct->numMenuChoices].name = gText_Cancel;
    sMoveRelearnerStruct->menuItems[sMoveRelearnerStruct->numMenuChoices].id = LIST_CANCEL;
    sMoveRelearnerStruct->numMenuChoices++;
    sMoveRelearnerStruct->numToShowAtOnce = LoadMoveRelearnerMovesList(sMoveRelearnerStruct->menuItems, sMoveRelearnerStruct->numMenuChoices);
}

void MoveRelearnerShowHideHearts(s32 moveId)
{
    u16 numHearts;
    u16 i;

    if (!sMoveRelearnerMenuSate.showContestInfo || moveId == LIST_CANCEL)
    {
        for (i = 0; i < 16; i++)
        {
            gSprites[sMoveRelearnerStruct->heartSpriteIds[i]].invisible = TRUE;
        }
    }
    else
    {
        numHearts = (u8)(gContestEffects[gContestMoves[moveId].effect].appeal / 10);

        if (numHearts == 0xFF)
        {
            numHearts = 0;
        }

        for (i = 0; i < 8; i++)
        {
            if (i < numHearts)
            {
                StartSpriteAnim(&gSprites[sMoveRelearnerStruct->heartSpriteIds[i]], 1);
            }
            else
            {
                StartSpriteAnim(&gSprites[sMoveRelearnerStruct->heartSpriteIds[i]], 0);
            }
            gSprites[sMoveRelearnerStruct->heartSpriteIds[i]].invisible = FALSE;
        }

        numHearts = (u8)(gContestEffects[gContestMoves[moveId].effect].jam / 10);

        if (numHearts == 0xFF)
        {
            numHearts = 0;
        }

        for (i = 0; i < 8; i++)
        {
            if (i < numHearts)
            {
                StartSpriteAnim(&gSprites[sMoveRelearnerStruct->heartSpriteIds[i + 8]], 3);
            }
            else
            {
                StartSpriteAnim(&gSprites[sMoveRelearnerStruct->heartSpriteIds[i + 8]], 2);
            }
            gSprites[sMoveRelearnerStruct->heartSpriteIds[i + 8]].invisible = FALSE;
        }
    }
}