#include "global.h"
#include "main.h"
#include "palette.h"
#include "task.h"
#include "link.h"

struct GcmbStruct
{
    u16 gcmb_field_0;
    u8 gcmb_field_2;
};

extern s32 gUnknown_03005ED0;
extern struct GcmbStruct gUnknown_03005EE0;
extern u16 gSaveFileStatus;

extern const u8 gIntroCopyright_Gfx[];
extern const u16 gIntroCopyright_Pal[];
extern const u16 gIntroCopyright_Tilemap[];

extern void CB2_InitTitleScreen(void);

void CB2_813B7EC(void);
void task_intro_1(u8);

void sub_813B784(void)
{
    LoadOam();
    ProcessSpriteCopyRequests();
    TransferPlttBuffer();
}

void CB2_813B798(void)
{
    RunTasks();
    AnimateSprites();
    BuildOamBuffer();
    UpdatePaletteFade();
    if (gMain.newKeys && !gPaletteFade.active)
        SetMainCallback2(CB2_813B7EC);
    else if (gUnknown_03005ED0 != -1)
        gUnknown_03005ED0++;
}

void CB2_813B7EC(void)
{
    if (!UpdatePaletteFade())
        SetMainCallback2(CB2_InitTitleScreen);
}

void sub_813B808(u16 a1, u16 a2, u16 a3)
{
    LZ77UnCompVram(gIntroCopyright_Gfx, (void *)(VRAM + a1));
    LoadPalette(gIntroCopyright_Pal, a3, 0x20);
    CpuCopy16(gIntroCopyright_Tilemap, (void *)(VRAM + a2), 0x500);
}

void SerialCb_CopyrightScreen(void)
{
    GameCubeMultiBoot_HandleSerialInterrupt(&gUnknown_03005EE0);
}

u8 SetUpCopyrightScreen(void)
{
    u16 ime;

    switch (gMain.state)
    {
    case 0:
        SetVBlankCallback(NULL);
        REG_BLDCNT = 0;
        REG_BLDALPHA = 0;
        REG_BLDY = 0;
        *(u16 *)PLTT = 0x7FFF;
        REG_DISPCNT = 0;
        REG_BG0HOFS = 0;
        REG_BG0VOFS = 0;
        DmaFill16(3, 0, (void *)VRAM, VRAM_SIZE);
        DmaFill32(3, 0, (void *)OAM, OAM_SIZE);
        DmaFill16(3, 0, (void *)(PLTT + 2), PLTT_SIZE - 2);
        ResetPaletteFade();
        sub_813B808(0, 14336, 0);
        remove_some_task();
        ResetTasks();
        ResetSpriteData();
        FreeAllSpritePalettes();
        BeginNormalPaletteFade(0xFFFFFFFF, 0, 0x10, 0, 0xFFFF);
        REG_BG0CNT = 1792;
        ime = REG_IME;
        REG_IME = 0;
        REG_IE |= INTR_FLAG_VBLANK;
        REG_IME = ime;
        REG_DISPSTAT |= 8;
        SetVBlankCallback(sub_813B784);
        REG_DISPCNT = 320;
        SetSerialCallback(SerialCb_CopyrightScreen);
        GameCubeMultiBoot_Init(&gUnknown_03005EE0);
    default:
        UpdatePaletteFade();
        gMain.state++;
        GameCubeMultiBoot_Main(&gUnknown_03005EE0);
        break;
    case 140:
        GameCubeMultiBoot_Main(&gUnknown_03005EE0);
        if (gUnknown_03005EE0.gcmb_field_2 != 1)
        {
            BeginNormalPaletteFade(0xFFFFFFFFu, 0, 0, 0x10, 0);
            gMain.state++;
        }
        break;
    case 141:
        if (UpdatePaletteFade())
            break;
        CreateTask(task_intro_1, 0);
        SetMainCallback2(CB2_813B798);
        if (gUnknown_03005EE0.gcmb_field_2)
        {
            GameCubeMultiBoot_ExecuteProgram(&gUnknown_03005EE0);
        }
        else
        {
            GameCubeMultiBoot_Quit();
            SetSerialCallback(SerialCB);
        }
        return 0;
    }

    return 1;
}

void c2_copyright_1(void)
{
    if (!SetUpCopyrightScreen())
    {
        sub_8052E4C();
        sub_81251B8();
        sub_8125EC8(0);
        if (gSaveFileStatus == 0 || gSaveFileStatus == 2)
            ClearSav2();
        SetPokemonCryStereo(gSaveBlock2.optionsSound);
    }
}

void sub_813BA88(void)
{
    SetUpCopyrightScreen();
}