#include "global.h"
#include "pokenav.h"
#include "event_data.h"
#include "main.h"
#include "sound.h"
#include "constants/songs.h"

struct Pokenav1Struct
{
    u16 menuType;
    s16 cursorPos;
    u16 descriptionId;
    u16 helpBarIndex;
    u32 unk8;
    u32 (*callback)(struct Pokenav1Struct*);
};

static bool32 sub_81C9814(struct Pokenav1Struct *a0);
static void sub_81C97F8(struct Pokenav1Struct *a0);
static void sub_81C97C0(struct Pokenav1Struct *a0);
static u32 sub_81C97BC(struct Pokenav1Struct *a0);
static void sub_81C97B0(struct Pokenav1Struct *a0, u32 a1);
static u32 sub_81C97A4(struct Pokenav1Struct *a0);
static u32 sub_81C9798(struct Pokenav1Struct *a0);
static u32 sub_81C96FC(struct Pokenav1Struct *a0);
static u32 sub_81C963C(struct Pokenav1Struct *a0);
static u32 sub_81C9600(struct Pokenav1Struct *a0);
static u32 sub_81C9588(struct Pokenav1Struct *a0);
static u32 sub_81C9520(struct Pokenav1Struct *a0);
static u32 sub_81C943C(struct Pokenav1Struct *a0);
static u32 (*sub_81C93EC(void))(struct Pokenav1Struct*);
static void sub_81C939C(struct Pokenav1Struct *state);

static const u8 sLastCursorPositions[] = {2, 3, 4, 2, 5};

static const u8 sDescriptionIds[][6] =
{
    { 0, 1,  4,  4,  4,  4 },
    { 0, 1,  2,  4,  4,  4 },
    { 0, 1,  2,  3,  4,  4 },
    { 5, 6,  7,  4,  4,  4 },
    { 8, 9, 10, 11, 12, 13 },
};

static u8 GetPokenavMainMenuType(void)
{
    u8 retVal = 0;
    if (FlagGet(FLAG_ADDED_MATCH_CALL_TO_POKENAV))
    { 
        retVal = 1;
        if (FlagGet(FLAG_SYS_RIBBON_GET))
            retVal = 2;
    }
    
    return retVal;
}

bool32 sub_81C9298(void)
{
    struct Pokenav1Struct *state = AllocSubstruct(1, sizeof(struct Pokenav1Struct));
    if (!state)
        return FALSE;
    
    state->menuType = GetPokenavMainMenuType();
    state->cursorPos = 0;
    state->descriptionId = 0;
    state->helpBarIndex = 0;
    sub_81C939C(state);
    return TRUE;
}

bool32 sub_81C92CC(void)
{
    struct Pokenav1Struct *state = AllocSubstruct(1, sizeof(struct Pokenav1Struct));
    if (!state)
        return FALSE;
    
    state->menuType = GetPokenavMainMenuType();
    state->cursorPos = 2;
    state->descriptionId = 2;
    state->helpBarIndex = 0;
    sub_81C939C(state);
    return TRUE;
}

bool32 sub_81C9304(void)
{
    struct Pokenav1Struct *state = AllocSubstruct(1, sizeof(struct Pokenav1Struct));
    if (!state)
        return FALSE;
    
    state->menuType = GetPokenavMainMenuType();
    state->cursorPos = 3;
    state->descriptionId = 3;
    sub_81C939C(state);
    return TRUE;
}

bool32 sub_81C9338(void)
{
    struct Pokenav1Struct *state = AllocSubstruct(1, sizeof(struct Pokenav1Struct));
    if (!state)
        return FALSE;
    
    state->menuType = 3;
    state->cursorPos = 0;
    state->descriptionId = 5;
    state->helpBarIndex = 0;
    sub_81C939C(state);
    return TRUE;
}

bool32 sub_81C9368(void)
{
    struct Pokenav1Struct *state = AllocSubstruct(1, sizeof(struct Pokenav1Struct));
    if (!state)
        return FALSE;
    
    state->menuType = 4;
    state->cursorPos = sub_81C76AC();
    state->descriptionId = state->cursorPos + 8;
    state->helpBarIndex = 0;
    sub_81C939C(state);
    return TRUE;
}

static void sub_81C939C(struct Pokenav1Struct *state)
{
    switch (state->menuType)
    {
    case 0:
        SetPokenavMode(POKENAV_MODE_NORMAL);
        // fallthrough
    case 1:
    case 2:
        state->callback = sub_81C93EC();
        break;
    case 3:
        state->callback = sub_81C963C;
        break;
    case 4:
        state->callback = sub_81C96FC;
        break;
    }
}

static u32 (*sub_81C93EC(void))(struct Pokenav1Struct*)
{
    switch (GetPokenavMode())
    {
    default:
    case POKENAV_MODE_NORMAL:
        return sub_81C943C;
    case POKENAV_MODE_FORCE_CALL_1:
        return sub_81C9520;
    case POKENAV_MODE_FORCE_CALL_2:
        return sub_81C9588;
    }
}

u32 sub_81C941C(void)
{
    struct Pokenav1Struct *state = GetSubstructPtr(1);
    return state->callback(state);
}

void sub_81C9430(void)
{
    FreePokenavSubstruct(1);
}

static u32 sub_81C943C(struct Pokenav1Struct *a0)
{
    if (sub_81C9814(a0))
        return 1;

    if (gMain.newKeys & A_BUTTON)
    {
        switch (sDescriptionIds[a0->menuType][a0->cursorPos])
        {
        case 0:
            a0->helpBarIndex = gSaveBlock2Ptr->regionMapZoom ? 2 : 1;
            sub_81C97B0(a0, POKENAV_MENU_6);
            return 8;
        case 1:
            a0->menuType = 3;
            a0->cursorPos = 0;
            a0->descriptionId = sDescriptionIds[3][0];
            a0->callback = sub_81C963C;
            return 2;
        case 2:
            a0->helpBarIndex = 6;
            sub_81C97B0(a0, POKENAV_MENU_B);
            return 8;
        case 3:
            if (CanViewRibbonsMenu())
            {
                a0->helpBarIndex = 9;
                sub_81C97B0(a0, POKENAV_MENU_C);
                return 8;
            }
            else
            {
                a0->callback = sub_81C9600;
                return 6;
            }
        case 4:
            return -1;
        }
    }
    
    if (gMain.newKeys & B_BUTTON)
        return -1;

    return 0;
}

static u32 sub_81C9520(struct Pokenav1Struct *a0)
{
    if (sub_81C9814(a0))
        return 1;
    
    if (gMain.newKeys & A_BUTTON)
    {
        if (sDescriptionIds[a0->menuType][a0->cursorPos] == 2)
        {
            a0->helpBarIndex = 6;
            sub_81C97B0(a0, POKENAV_MENU_B);
            return 8;
        }
        else
        {
            PlaySE(SE_HAZURE);
            return 0;
        }
    }
    
    if (gMain.newKeys & B_BUTTON)
    {
        PlaySE(SE_HAZURE);
        return 0;
    }
    
    return 0;
}

static u32 sub_81C9588(struct Pokenav1Struct *a0)
{
    if (sub_81C9814(a0))
        return 1;
    
    if (gMain.newKeys & A_BUTTON)
    {
        u32 v0 = sDescriptionIds[a0->menuType][a0->cursorPos];
        if (v0 != 2 && v0 != 4)
        {
            PlaySE(SE_HAZURE);
            return 0;
        }
        else if (v0 == 2)
        {
            a0->helpBarIndex = 6;
            sub_81C97B0(a0, POKENAV_MENU_B);
            return 8;
        }
        else
        {
            return -1;
        }
    }
    else if (gMain.newKeys & B_BUTTON)
    {
        return -1;
    }
    return 0;
}

static u32 sub_81C9600(struct Pokenav1Struct *a0)
{
    if (sub_81C9814(a0))
    {
        a0->callback = sub_81C93EC();
        return 1;
    }

    if (gMain.newKeys & (A_BUTTON | B_BUTTON))
    {
        a0->callback = sub_81C93EC();
        return 7;
    }

    return 0;
}

static u32 sub_81C963C(struct Pokenav1Struct *a0)
{
    u32 v0 = sub_81C9814(a0);
    if (v0)
        return 1;
    
    if (gMain.newKeys & A_BUTTON)
    {
        switch (sDescriptionIds[a0->menuType][a0->cursorPos])
        {
        case 6:
            a0->menuType = 4;
            a0->cursorPos = v0;
            a0->descriptionId = sDescriptionIds[4][0];
            a0->callback = sub_81C96FC;
            return 4;
        case 5:
            a0->helpBarIndex = v0;
            sub_81C97B0(a0, POKENAV_MENU_7);
            return 8;
        case 7:
            PlaySE(SE_SELECT);
            sub_81C97C0(a0);
            return 3;
        }
    }
    if (gMain.newKeys & B_BUTTON)
    {
        if (a0->cursorPos != sLastCursorPositions[a0->menuType])
        {
            a0->cursorPos = sLastCursorPositions[a0->menuType];
            a0->callback = sub_81C9798;
            return 1;
        }
        else
        {
            PlaySE(SE_SELECT);
            sub_81C97C0(a0);
            return 3;
        }
    }

    return 0;
}

static u32 sub_81C96FC(struct Pokenav1Struct *a0)
{
    if (sub_81C9814(a0))
        return 1;
    
    if (gMain.newKeys & A_BUTTON)
    {
        u8 v0 = sDescriptionIds[a0->menuType][a0->cursorPos];
        if (v0 != 13)
        {
            sub_81C7694(v0 - 8);
            sub_81C97B0(a0, POKENAV_MENU_8);
            a0->helpBarIndex = 3;
            return 8;
        }
        else
        {
            PlaySE(SE_SELECT);
            sub_81C97F8(a0);
            return 5;
        }
    }
    if (gMain.newKeys & B_BUTTON)
    {
        if (a0->cursorPos != sLastCursorPositions[a0->menuType])
        {
            a0->cursorPos = sLastCursorPositions[a0->menuType];
            a0->callback = sub_81C97A4;
            return 1;
        }
        else
        {
            PlaySE(SE_SELECT);
            sub_81C97F8(a0);
            return 5;
        }
    }
    return 0;
}

static u32 sub_81C9798(struct Pokenav1Struct *a0)
{
    sub_81C97C0(a0);
    return 3;
}

static u32 sub_81C97A4(struct Pokenav1Struct *a0)
{
    sub_81C97F8(a0);
    return 5;
}

static void sub_81C97B0(struct Pokenav1Struct *a0, u32 a1)
{
    a0->unk8 = a1;
    a0->callback = sub_81C97BC;
}

static u32 sub_81C97BC(struct Pokenav1Struct *a0)
{
    return a0->unk8;
}

static void sub_81C97C0(struct Pokenav1Struct *a0)
{
    a0->menuType = GetPokenavMainMenuType();
    a0->cursorPos = 1;
    a0->descriptionId = sDescriptionIds[a0->menuType][a0->cursorPos];
    a0->callback = sub_81C943C;
}

static void sub_81C97F8(struct Pokenav1Struct *a0)
{
    a0->menuType = 3;
    a0->cursorPos = 1;
    a0->descriptionId = sDescriptionIds[3][1];
    a0->callback = sub_81C963C;
}

static bool32 sub_81C9814(struct Pokenav1Struct *a0)
{
    if (gMain.newKeys & DPAD_UP)
    {
        if (--a0->cursorPos < 0)
            a0->cursorPos = sLastCursorPositions[a0->menuType];

        a0->descriptionId = sDescriptionIds[a0->menuType][a0->cursorPos];
        return TRUE;
    }
    else if (gMain.newKeys & DPAD_DOWN)
    {
        a0->cursorPos++;
        if (a0->cursorPos > sLastCursorPositions[a0->menuType])
            a0->cursorPos = 0;

        a0->descriptionId = sDescriptionIds[a0->menuType][a0->cursorPos];
        return TRUE;
    }
    else
    {
        return FALSE;
    }
}

int sub_81C9894(void)
{
    struct Pokenav1Struct *state = GetSubstructPtr(1);
    return state->menuType;
}

int sub_81C98A4(void)
{
    struct Pokenav1Struct *state = GetSubstructPtr(1);
    return state->cursorPos;
}

int sub_81C98B4(void)
{
    struct Pokenav1Struct *state = GetSubstructPtr(1);
    return state->descriptionId;
}

u16 sub_81C98C4(void)
{
    struct Pokenav1Struct *state = GetSubstructPtr(1);
    return state->helpBarIndex;
}