#define WIN32_LEAN_AND_MEAN
#define _WIN32_WINNT 0x0501
#include <windows.h>
#include "rawinput.h"
#include "winlayer.h"
#include "scancodes.h"
#include "build.h"

static BOOL rawinput_started = 0;
static uint8_t KeyboardState[256] = {0}; // VKeys
static int8_t MWheel = 0;

extern volatile uint8_t moustat, mousegrab;
extern uint32_t mousewheel[2];
extern void SetKey(int32_t key, int32_t state);

//#define MASK_DOWN (1<<(i<<1))
//#define MASK_UP (MASK_DOWN<<1)
#define MouseWheelFakePressTime 50
#ifndef GET_RAWINPUT_CODE_WPARAM
#define GET_RAWINPUT_CODE_WPARAM(wParam)    ((wParam) & 0xff)
#endif

static inline void RI_ProcessMouse(const RAWMOUSE *rmouse)
{
    int32_t i, mask;

    if (!mousegrab || !appactive)
        return;

    mousex += rmouse->lLastX;
    mousey += rmouse->lLastY;

    if (rmouse->usFlags & MOUSE_MOVE_ABSOLUTE)
    {
        // untested... maybe devices like wacom tablets set this flag?
        POINT pos = { xdim>>1, ydim>>1 };

        ClientToScreen((HWND)win_gethwnd(), &pos);

        mousex -= pos.x;
        mousey -= pos.y;
    }

    for (i = 0, mask = (1<<0); mask < (1<<8); i++, mask<<=2)
    {
        // usButtonFlags:
        //  1<<0: left down   -> 1 / 1<<0
        //  1<<2: middle down -> 2 / 1<<1
        //  1<<4: right down  -> 3 / 1<<2
        //  1<<6: x1 down     -> 4 / 1<<3
        //                    ----------- mwheel here
        //  1<<8: x2 down     -> 7 / 1<<6

        if (mask == 1<<8)
            i = 6;

        if (rmouse->usButtonFlags & mask) // button down
        {
            if (mousepresscallback)
                mousepresscallback(i+1, 1);
            mouseb |= 1<<i;
        }
        else if (rmouse->usButtonFlags & (mask<<1)) // button up
        {
            if (mousepresscallback)
                mousepresscallback(i+1, 0);
            mouseb &= ~(1<<i);
        }
    }

    MWheel = (rmouse->usButtonFlags & RI_MOUSE_WHEEL) ? rmouse->usButtonData : 0;

    if (MWheel > 0)   	// wheel up
    {
        if (mousewheel[0] > 0 && mousepresscallback) mousepresscallback(5,0);
        mousewheel[0] = getticks();
        mouseb |= 16;
        if (mousepresscallback) mousepresscallback(5, 1);
    }
    else if (MWheel < 0)  	// wheel down
    {
        if (mousewheel[1] > 0 && mousepresscallback) mousepresscallback(6,0);
        mousewheel[1] = getticks();
        mouseb |= 32;
        if (mousepresscallback) mousepresscallback(6, 1);
    }
}

static inline void RI_ProcessKeyboard(const RAWKEYBOARD *rkbd)
{
    uint8_t key = rkbd->MakeCode, VKey = rkbd->VKey;

    // for some reason rkbd->MakeCode is wrong for these
    // even though rkbd->VKey is right...

    switch (VKey)
    {
    case VK_SHIFT:
        if (rkbd->Flags & RI_KEY_E0) VKey = VK_RSHIFT, key = sc_RightShift; break;
    case VK_CONTROL:
        if (rkbd->Flags & RI_KEY_E0) VKey = VK_RCONTROL, key = sc_RightControl; break;
    case VK_MENU:
        if (rkbd->Flags & RI_KEY_E0) VKey = VK_RMENU, key = sc_RightAlt; break;
    case VK_UP:
    case VK_NUMPAD8:
        if (rkbd->Flags & RI_KEY_E0) VKey = VK_UP, key = sc_UpArrow;
        else VKey = VK_NUMPAD8, key = sc_kpad_8; break;
    case VK_DOWN:
    case VK_NUMPAD2:
        if (rkbd->Flags & RI_KEY_E0) VKey = VK_DOWN, key = sc_DownArrow;
        else VKey = VK_NUMPAD2, key = sc_kpad_2; break;
    case VK_LEFT:
    case VK_NUMPAD4:
        if (rkbd->Flags & RI_KEY_E0) VKey = VK_LEFT, key = sc_LeftArrow;
        else VKey = VK_NUMPAD4, key = sc_kpad_4; break;
    case VK_RIGHT:
    case VK_NUMPAD6:
        if (rkbd->Flags & RI_KEY_E0) VKey = VK_RIGHT, key = sc_RightArrow;
        else VKey = VK_NUMPAD6, key = sc_kpad_6; break;
    case VK_DIVIDE:
//        if (rkbd->Flags & RI_KEY_E0) key = sc_Slash;
//        else
        key = sc_kpad_Slash;
        break;
    case VK_INSERT:
        key = sc_Insert; break;
    case VK_HOME:
        key = sc_Home; break;
    case VK_DELETE:
        key = sc_Delete; break;
    case VK_END:
        key = sc_End; break;
    case VK_PRIOR:
        key = sc_PgUp; break;
    case VK_NEXT:
        key = sc_PgDn; break;
    case VK_RETURN:
        if (rkbd->Flags & RI_KEY_E0) key = sc_kpad_Enter; break;
    case VK_PAUSE:
        KeyboardState[VKey] = 1 - (rkbd->Flags & RI_KEY_BREAK);
        if (rkbd->Flags & RI_KEY_BREAK) return;

        SetKey(sc_Pause, 1);

        if (keypresscallback)
            keypresscallback(sc_Pause, 1);
        return;
    }

    KeyboardState[VKey] = 1 - (rkbd->Flags & RI_KEY_BREAK);

    if (OSD_HandleScanCode(key, KeyboardState[VKey] != 0))
    {
        SetKey(key, KeyboardState[VKey] != 0);

        if (keypresscallback)
            keypresscallback(key, KeyboardState[VKey] != 0);
    }

    if (rkbd->Flags & RI_KEY_BREAK) return;
    if (((keyasciififoend+1)&(KEYFIFOSIZ-1)) == keyasciififoplc) return;
    if ((keyasciififoend - keyasciififoplc) > 0) return;

    {
        uint8_t buf[2];

        if (ToAscii(VKey, key, &KeyboardState[0], (LPWORD)&buf[0], 0) != 1) return;
        if ((OSD_OSDKey() < 128) && (Btolower(scantoasc[OSD_OSDKey()]) == Btolower(buf[0]))) return;
        if (OSD_HandleChar(buf[0]) == 0) return;

        keyasciififo[keyasciififoend] = buf[0];
        keyasciififoend = ((keyasciififoend+1)&(KEYFIFOSIZ-1));
    }
}

// keyboard is always captured regardless of what we tell this function
BOOL RI_CaptureInput(BOOL grab, HWND target)
{
    RAWINPUTDEVICE raw[2];

    raw[0].usUsagePage = 0x01;
    raw[0].usUsage = 0x02;
    raw[0].dwFlags = grab ? (RIDEV_NOLEGACY | RIDEV_CAPTUREMOUSE) : 0;
    raw[0].hwndTarget = grab ? target : NULL;

    raw[1].usUsagePage = 0x01;
    raw[1].usUsage = 0x06;
    raw[1].dwFlags = 0;
    raw[1].hwndTarget = target;

    mousegrab = grab;

    return (RegisterRawInputDevices(raw, 2, sizeof(raw[0])) == FALSE);
}

void RI_ProcessMessage(MSG *msg)
{
    if (GET_RAWINPUT_CODE_WPARAM(msg->wParam) == RIM_INPUT)
    {
        UINT dwSize = sizeof(RAWINPUT);
        RAWINPUT raw;

        GetRawInputData((HRAWINPUT)msg->lParam, RID_INPUT, &raw, &dwSize, sizeof(RAWINPUTHEADER));

        if (raw.header.dwType == RIM_TYPEKEYBOARD)
            RI_ProcessKeyboard(&raw.data.keyboard);
        else if (raw.header.dwType == RIM_TYPEMOUSE)
            RI_ProcessMouse(&raw.data.mouse);
    }

    DefWindowProc(msg->hwnd, msg->message, msg->wParam, msg->lParam);
}

void RI_PollDevices(BOOL loop)
{
    int32_t i;
    MSG msg;

    if (!rawinput_started)
    {
        if (RI_CaptureInput(1, (HWND)win_gethwnd()))
            return;
        rawinput_started = 1;
    }

    // snapshot the whole keyboard state so we can translate key presses into ascii later
    for (i = 0; i < 256; i++)
        KeyboardState[i] = GetAsyncKeyState(i) >> 8;

    MWheel = 0;

    while (loop && PeekMessage(&msg, 0, WM_INPUT, WM_INPUT, PM_REMOVE | PM_QS_INPUT))
        RI_ProcessMessage(&msg);

    if (mousegrab && appactive)
    {
        // center the cursor in the window
        POINT pt = { xdim>>1, ydim>>1 };

        ClientToScreen((HWND)win_gethwnd(), &pt);
        SetCursorPos(pt.x, pt.y);

        // do this here because we only want the wheel to signal once, but hold the state for a moment
        if (mousewheel[0] > 0 && getticks() - mousewheel[0] > MouseWheelFakePressTime)
        {
            if (mousepresscallback) mousepresscallback(5,0);
            mousewheel[0] = 0; mouseb &= ~16;
        }
        if (mousewheel[1] > 0 && getticks() - mousewheel[1] > MouseWheelFakePressTime)
        {
            if (mousepresscallback) mousepresscallback(6,0);
            mousewheel[1] = 0; mouseb &= ~32;
        }
    }
}

int32_t initmouse(void)
{
    if (moustat) return 0;
    grabmouse(moustat = 1);
    return 0;
}

void uninitmouse(void)
{
    if (!moustat) return;
    grabmouse(moustat = 0);
}

void grabmouse(char a)
{
    static POINT pos;
    static int32_t d = 0;

    if (!moustat) return;

    if (!mousegrab || !d)
    {
        GetCursorPos(&pos);
        d++;
    }

    ShowCursor(a == 0);
    RI_CaptureInput(a, (HWND)win_gethwnd());
    SetCursorPos(pos.x, pos.y);
}