#include "global.h"
#include "asm.h"
#include "main.h"
#include "menu.h"
#include "palette.h"
#include "sprite.h"
#include "text.h"

extern void sub_80FA8EC(u32, u8);
extern void sub_80FAB10(void);
extern u8 sub_80FAB60(void);
extern void sub_80FBCF0(u32, u8);
extern void sub_80FBB3C(u16, u16);

struct RegionMapStruct
{
    u8 str[0x16];
    u8 unk16;
    u8 filler[0x869];
};

struct UnkStruct
{
    MainCallback callback;
    u8 filler[4];
    struct RegionMapStruct unk8;
    u16 unk888;
};

extern struct UnkStruct unk_2000000;

extern u8 gOtherText_Hoenn[];

void CB2_FieldInitRegionMap(void);
void CB2_FieldRegionMap(void);
void VBlankCB_FieldRegionMap(void);
void sub_813EFDC(void);
void sub_813F0C8(void);

void FieldInitRegionMap(MainCallback callback)
{
    SetVBlankCallback(NULL);
    unk_2000000.unk888 = 0;
    unk_2000000.callback = callback;
    SetMainCallback2(CB2_FieldInitRegionMap);
}

void CB2_FieldInitRegionMap(void)
{
    REG_DISPCNT = 0;
    REG_BG0HOFS = 0;
    REG_BG0VOFS = 0;
    REG_BG1HOFS = 0;
    REG_BG1VOFS = 0;
    REG_BG2HOFS = 0;
    REG_BG2VOFS = 0;
    REG_BG3HOFS = 0;
    REG_BG3VOFS = 0;
    ResetSpriteData();
    FreeAllSpritePalettes();
    sub_80FA8EC((u32)&unk_2000000.unk8, 0);
    sub_80FBCF0(0, 0);
    sub_80FBB3C(1, 1);
    SetUpWindowConfig(&gWindowConfig_81E709C);
    InitMenuWindow(&gWindowConfig_81E709C);
    MenuZeroFillScreen();
    REG_BG0CNT = 7936;
    MenuDrawTextWindow(21, 0, 29, 3);
    sub_8072BD8(gOtherText_Hoenn, 0x16, 1, 0x38);
    MenuDrawTextWindow(16, 16, 29, 19);
    sub_813F0C8();
    SetMainCallback2(CB2_FieldRegionMap);
    SetVBlankCallback(VBlankCB_FieldRegionMap);
    BeginNormalPaletteFade(0xFFFFFFFF, 0, 0x10, 0, 0);
}

void VBlankCB_FieldRegionMap(void)
{
    LoadOam();
    ProcessSpriteCopyRequests();
    TransferPlttBuffer();
}

void CB2_FieldRegionMap(void)
{
    sub_813EFDC();
    AnimateSprites();
    BuildOamBuffer();
    UpdatePaletteFade();
}

void sub_813EFDC(void)
{
    switch (unk_2000000.unk888)
    {
    case 0:
        REG_DISPCNT = 5441;
        unk_2000000.unk888++;
        break;
    case 1:
        if (!gPaletteFade.active)
            unk_2000000.unk888++;
        break;
    case 2:
        switch (sub_80FAB60())
        {
        case 3:
            sub_813F0C8();
            break;
        case 4:
        case 5:
            unk_2000000.unk888++;
        }
        break;
    case 3:
        BeginNormalPaletteFade(0xFFFFFFFF, 0, 0, 0x10, 0);
        unk_2000000.unk888++;
        break;
    case 4:
        if (!gPaletteFade.active)
        {
            sub_80FAB10();
            SetMainCallback2(unk_2000000.callback);
        }
        break;
    }
}

void sub_813F0C8(void)
{
    MenuFillWindowRectWithBlankTile(17, 17, 28, 18);
    if (unk_2000000.unk8.unk16)
        MenuPrint(unk_2000000.unk8.str, 17, 17);
}