#include "global.h"
#include "field_screeneffect.h"
#include "asm.h"
#include "palette.h"
#include "sprite.h"
#include "task.h"

struct Weather
{
    u8 filler_000[0x200];
    u8 unknown_200[2][32];
    u8 filler_240[0x480];
    s8 unknown_6C0;
    s8 unknown_6C1;
    u8 unknown_6C2;
    u8 unknown_6C3;
    u16 unknown_6C4;
    u8 unknown_6C6;
    u8 unknown_6C7;
    u8 unknown_6C8;
    u8 unknown_6C9;
    u8 unknown_6CA;
    u8 unknown_6CB;
    u8 filler_6CC[2];
    u16 unknown_6CE;
    u8 unknown_6D0;
    u8 unknown_6D1;
    u8 filler_6D2[1];
    u8 unknown_6D3;
    u8 unknown_6D4;
    u8 unknown_6D5;
    u8 filler_6D6[2];
    u8 unknown_6D8;
    u8 filler_6D9[1];
    u8 unknown_6DA;
    u8 filler_6DB[3];
    u8 unknown_6DE;
    u8 filler_6DF[5];
    u8 unknown_6E4;
    u8 filler_6E5[0x15];
    u8 unknown_6FA;
    u8 unknown_6FB;
    u8 filler_6FC[4];
    u8 unknown_700;
    u8 filler_701[0x15];
    u8 unknown_716;
    u8 unknown_717;
    u8 filler_718[0xc];
    u8 unknown_724;
    u8 filler_725[9];
    u8 unknown_72E;
};

#define gWeather gUnknown_0202F7E8
extern struct Weather gWeather;
extern u8 *gUnknown_083970E8;
extern u8 (*gUnknown_08396FC8[][4])(void);
extern u8 (*gUnknown_083970B8[])(void);
extern u8 *gUnknown_030006DC;
extern u8 gUnknown_083970C8;
extern u8 (*gUnknown_0202FC48)[32];
extern u8 gUnknown_0202F9E8[32];


void sub_807C828(void)
{
    u8 index;
    if (!FuncIsActiveTask(&sub_807CA34))
    {
        index = AllocSpritePalette(0x1200);
        CpuCopy32(&gUnknown_083970E8, &gPlttBufferUnfaded[0x100 + index * 16], 32);
        sub_807CB10();
        gWeather.unknown_6D5 = index;
        gWeather.unknown_6D4 = AllocSpritePalette(0x1201);
        gWeather.unknown_6DA = 0;
        gWeather.unknown_6D8 = 0;
        gWeather.unknown_6DE = 0;
        gWeather.unknown_6E4 = 0;
        gWeather.unknown_700 = 0;
        gWeather.unknown_6FB = 0;
        gWeather.unknown_724 = 0;
        gWeather.unknown_716 = 0;
        gWeather.unknown_717 = 0;
        gWeather.unknown_72E = 0;
        gWeather.unknown_6FA = 0;
        sub_807DB64(16, 0);
        gWeather.unknown_6D0 = 0;
        gWeather.unknown_6C6 = 3;
        gWeather.unknown_6C8 = 0;
        gWeather.unknown_6D3 = 1;
        gWeather.unknown_6C9 = CreateTask(&sub_807C9E4, 80);
    }
}

void DoWeatherEffect(u8 effect)
{
    if (effect != 3 && effect != 5 && effect != 13)
    {
        PlayRainSoundEffect();
    }
    if (gWeather.unknown_6D1 != effect && gWeather.unknown_6D0 == effect)
    {
        gUnknown_08396FC8[effect][0]();
    }
    gWeather.unknown_6D3 = 0;
    gWeather.unknown_6D1 = effect;
    gWeather.unknown_6CE = 0;
}

void sub_807C988(u8 effect)
{
    PlayRainSoundEffect();
    gWeather.unknown_6D0 = effect;
    gWeather.unknown_6D1 = effect;
}

void sub_807C9B4(u8 effect)
{
    PlayRainSoundEffect();
    gWeather.unknown_6D0 = effect;
    gWeather.unknown_6D1 = effect;
    gWeather.unknown_6C8 = 1;
}

void sub_807C9E4(u8 task)
{
    if (gWeather.unknown_6C8)
    {
        gUnknown_08396FC8[gWeather.unknown_6D0][2]();
        gTasks[task].func = &sub_807CA34;
    }
}

void sub_807CA34(u8 task)
{
    u8 v1;
    if (gWeather.unknown_6D0 != gWeather.unknown_6D1)
    {
        v1 = gUnknown_08396FC8[gWeather.unknown_6D0][3]();
        if (!v1)
        {
            gUnknown_08396FC8[gWeather.unknown_6D1][0]();
            gWeather.unknown_6C3 = 0; // compiler reuses v1
            gWeather.unknown_6C6 = 0; // compiler reuses v1
            gWeather.unknown_6D0 = gWeather.unknown_6D1;
            gWeather.unknown_6D3 = 1;
        }
    }
    else
    {
        gUnknown_08396FC8[gWeather.unknown_6D0][1]();
    }
    gUnknown_083970B8[gWeather.unknown_6C6]();
}

void sub_807CAE8(void)
{
    gWeather.unknown_6C1 = 0;
    gWeather.unknown_6C2 = 0;
}

void nullsub_38(void)
{
}

u32 sub_807CB0C(void)
{
    return 0;
}

void sub_807CB10(void)
{
    u16 v0;
    u8(*v1)[32];
    u16 v2;
    u16 v4;
    u16 v5;
    u16 v6;
    u16 v9;
    u32 v10;
    u16 v11;
    s16 dunno;

    gUnknown_030006DC = &gUnknown_083970C8;
    for (v0 = 0; v0 <= 1; v0++)
    {
        if (v0 == 0)
        {
            v1 = &gUnknown_0202F9E8;
        }
        else
        {
            v1 = &gUnknown_0202F9E8 + 19;
        }
        for (v2 = 0; (u16)v2 <= 0x1f; v2++)
        {
            v4 = v2 << 8;
            if (v0 == 0)
            {
                v5 = (v2 << 8) / 16;
            }
            else
            {
                v5 = 0;
            }
            v6 = 0;
            for (; v6 <= 2; v6++)
            {
                v4 = (v4 - v5);
                v1[v6][v2] = v4 >> 8;
            }
            v9 = v4;
            v10 = 0x1f00 - v4;
            if ((0x1f00 - v4) < 0)
            {
                v10 += 0xf;
            }
            v11 = v10 >> 4;
            if (v2 <= 0xb)
            {
                for (; v6 <= 0x12; v6++)
                {
                    v4 += v11;
                    dunno = v4 - v9;
                    if (dunno > 0)
                    {
                        v4 -= (dunno + ((u16)dunno >> 15)) >> 1;
                    }
                    v1[v6][v2] = v4 >> 8;
                    if (v1[v6][v2] > 0x1f)
                    {
                        v1[v6][v2] = 0x1f;
                    }
                }
            }
            else
            {
                for (; v6 <= 0x12; v6++)
                {
                    v4 += v11;
                    v1[v6][v2] = v4 >> 8;
                    if (v1[v6][v2] > 0x1f)
                    {
                        v1[v6][v2] = 0x1f;
                    }
                }
            }
        }
    }
}

void sub_807CC24(void)
{
    if (gWeather.unknown_6C0 == gWeather.unknown_6C1)
    {
        gWeather.unknown_6C6 = 3;
    }
    else
    {
        if (++gWeather.unknown_6C3 >= gWeather.unknown_6C2)
        {
            gWeather.unknown_6C3 = 0;
            if (gWeather.unknown_6C0 < gWeather.unknown_6C1)
            {
                gWeather.unknown_6C0++;
            }
            else
            {
                gWeather.unknown_6C0--;
            }
            sub_807CEBC(0, 0x20, gWeather.unknown_6C0);
        }
    }
}

void sub_807CCAC(void)
{
    if (++gWeather.unknown_6CB > 1)
    {
        gWeather.unknown_6CA = 0;
    }
    switch (gWeather.unknown_6D0)
    {
    case 3:
    case 4:
    case 5:
    case 11:
    case 13:
        if (sub_807CDC4() == 0)
        {
            gWeather.unknown_6C0 = 3;
            gWeather.unknown_6C6 = 3;
        }
        break;
    case 12:
        if (sub_807CE24() == 0)
        {
            gWeather.unknown_6C0 = -6;
            gWeather.unknown_6C6 = 3;
        }
        break;
    case 6:
        if (sub_807CE7C() == 0)
        {
            gWeather.unknown_6C0 = 0;
            gWeather.unknown_6C6 = 3;
        }
        break;
    case 7:
    case 8:
    case 9:
    case 10:
    default:
        if (!gPaletteFade.active)
        {
            gWeather.unknown_6C0 = gWeather.unknown_6C1;
            gWeather.unknown_6C6 = 3;
        }
        break;
    }
}

u8 sub_807CDC4(void)
{
    if (gWeather.unknown_6C7 == 0x10)
    {
        return 0;
    }
    if (++gWeather.unknown_6C7 >= 0x10)
    {
        sub_807CEBC(0, 0x20, 3);
        gWeather.unknown_6C7 = 0x10;
        return 0;
    }
    sub_807D1BC(0, 0x20, 3, 0x10 - gWeather.unknown_6C7, gWeather.unknown_6C4);
    return 1;
}

u8 sub_807CE24(void)
{
    if (gWeather.unknown_6C7 == 0x10)
    {
        return 0;
    }
    if (++gWeather.unknown_6C7 >= 0x10)
    {
        sub_807CEBC(0, 0x20, -6);
        gWeather.unknown_6C7 = 0x10;
        return 0;
    }
    sub_807D304(-6, 0x10 - gWeather.unknown_6C7, gWeather.unknown_6C4);
    return 1;
}

u8 sub_807CE7C(void)
{
    if (gWeather.unknown_6C7 == 0x10)
    {
        return 0;
    }
    ++gWeather.unknown_6C7;
    sub_807D424(0x10 - gWeather.unknown_6C7, gWeather.unknown_6C4);
    return 1;
}

void nullsub_39(void)
{
}