#ifndef ACTION_H
#define ACTION_H

#include "keyboard.h"


/* Key Action(16bit code)

Keyboard Keys
-------------
ACT_LMODS(0000):
0000|0000|000000|00    No action
0000|mods|000000|00    Left mods Momentary
0000|mods|000000|01    Left mods OneShot
0000|mods|000000|10    (reserved)
0000|mods|000000|11    (reserved)
0000|0000| keycode     Key
0000|mods| keycode     Key+Left mods

ACT_RMODS(0001):
0001|0000|000000|00    No action
0001|mods|000000|00    Right mods Momentary
0001|mods|000000|01    Right mods OneShot
0001|mods|000000|10    (reserved)
0001|mods|000000|11    (reserved)
0001|0000| keycode     Key
0001|mods| keycode     Key+Right mods

ACT_LMODS_TAP(0010):
0010|mods| keycode     Left mods+tap Key

ACT_RMODS_TAP(0011):
0011|mods| keycode     Right mods+tap Key
 

Other HID Usage
---------------
This action handles other usages than keyboard.
ACT_USAGE(0100):
0100|00| usage(10)     System control(0x80) - General Desktop page(0x01)
0100|01| usage(10)     Consumer control(0x01) - Consumer page(0x0C)
0100|10| usage(10)     (reserved)
0100|11| usage(10)     (reserved)


Mouse Keys
----------
ACT_MOUSEKEY(0110):
0101|XXXX| keycode     Mouse key


Layer Actions
-------------
ACT_LAYER_PRESSED(1000):    Set layer on key pressed
ACT_LAYER_RELEASED(1001):   Set layer on key released
ACT_LAYER_BIT(1010):        On/Off layer bit
ACT_LAYER_EXT(1011):        Extentions

1000|LLLL|0000 0000   set layer L when pressed
1001|LLLL|0000 0000   set layer L when released
1010|BBBB|0000 0000   on/off bit B when pressed/released
1011|0000|0000 0000   set default layer when pressed
1011|0001|0000 0000   set default layer when released

1000|LLLL|1111 0000   set layer L when pressed + tap toggle
1001|LLLL|1111 0000   set layer L when released[tap is ignored/not used]
1010|BBBB|1111 0000   on/off bit B when pressed/released + tap toggle
1011|0000|1111 0000   set default layer when pressed + tap toggle
1011|0001|1111 0000   set default layer when released[tap is ignored/not used]

1000|LLLL|1111 1111   set L to default layer when pressed
1001|LLLL|1111 1111   set L to default layer when released
1010|BBBB|1111 1111   on/off bit B of default layer when pressed/released
1011|0000|1111 1111   set current to default layer when pressed
1011|0001|1111 1111   set current to default layer when released

1000|LLLL| keycode    set layer L when pressed + tap key
1001|LLLL| keyocde    set layer L when released[tap is ignored/not used]
1010|BBBB| keyocde    on/off bit B when pressed/released + tap key
1011|0000| keyocde    set default layer when pressed + tap key
1011|0001| keyocde    set default layer when released[tap is ignored/not used]
 

Extensions(11XX)
----------------
NOTE: NOT FIXED

ACT_MACRO(1100):
1100|opt | id(8)      Macro play
1100|1111| id(8)      Macro record

ACT_COMMAND(1110):
1110|opt | id(8)      Built-in Command exec

ACT_FUNCTION(1111):
1111| address(12)     Function
                                                    Macro record(dynamicly)
                                                    Macro play(dynamicly)
TODO: modifier + [tap key /w mod]
    : layerkey + [tap key /w mod]
    for example: LShift + '('[Shift+9] and RShift + ')'[Shift+0]
    http://deskthority.net/workshop-f7/tmk-keyboard-firmware-collection-t4478.html#p90052
*/

enum action_id {
    ACT_LMODS           = 0b0000,
    ACT_RMODS           = 0b0001,
    ACT_LMODS_TAP       = 0b0010,
    ACT_RMODS_TAP       = 0b0011,

    ACT_USAGE           = 0b0100,
    ACT_MOUSEKEY        = 0b0101,

    ACT_LAYER_PRESSED   = 0b1000,
    ACT_LAYER_RELEASED  = 0b1001,
    ACT_LAYER_BIT       = 0b1010,
    ACT_LAYER_EXT       = 0b1011,

    ACT_MACRO           = 0b1100,
    ACT_COMMAND         = 0b1110,
    ACT_FUNCTION        = 0b1111
};

// TODO: not portable across compiler/endianness?
/*
In avr-gcc bit fields seems to be assigned from LSB(bit0) to MSB(bit15). 
AVR looks like a little endian in avr-gcc.

Byte order and bit order of 0x1234:
Big endian:     15 ...  8 7 ... 210
               |  0x12   |  0x34   |
                0001 0010 0011 0100
Little endian:  012 ... 7  8 ... 15
               |  0x34   |  0x12   |
                0010 1100 0100 1000
*/
typedef union {
    uint16_t code;
    struct action_kind {
        uint16_t param  :12;
        uint16_t id     :4;
    } kind;
    struct action_key {
        uint16_t code   :8;
        uint16_t mods   :4;
        uint16_t kind   :4;
    } key;
    struct action_layer {
        uint16_t code   :8;
        uint16_t opt    :4;
        uint16_t kind   :4;
    } layer;
    struct action_usage {
        uint16_t code   :10;
        uint16_t page   :2;
        uint16_t kind   :4;
    } usage;
    struct action_command {
        uint16_t id     :8;
        uint16_t option :4;
        uint16_t kind   :4;
    } command;
} action_t;


enum stroke_cmd {
    STROKE_DOWN,
    STROKE_UP,
    STROKE_ALLUP, /* release all keys in reverse order */
};

typedef struct {
    keyevent_t  event;
    action_t    action;
    uint8_t     mods;
} keyrecord_t;


void action_exec(keyevent_t event);


// TODO: proper names
/* action_t utility */
#define ACTION_NO                       0
#define ACTION(kind, param)             ((kind)<<12 | (param))
#define MOD_BITS(mods)                  (((mods)>>4 | (mods)) & 0x0F)

/* Key & Mods */
#define ACTION_KEY(key)                 ACTION(ACT_LMODS,    key)
#define ACTION_LMODS(mods)              ACTION(ACT_LMODS,    (mods)<<8 | 0x00)
#define ACTION_LMODS_KEY(mods, key)     ACTION(ACT_LMODS,    (mods)<<8 | (key))
#define ACTION_LMODS_ONESHOT(mods)      ACTION(ACT_LMODS,    (mods)<<8 | 0x01)
#define ACTION_LMODS_SWITCH(mods, tap)  ACTION(ACT_LMODS,    (mods)<<8 | 0xF0 | (tap))
#define ACTION_LMODS_TOGGLE(mods, tap)  ACTION(ACT_LMODS,    (mods)<<8 | 0xF1 | (tap))
#define ACTION_RMODS(mods)              ACTION(ACT_RMODS,    (mods)<<8 | 0x00)
#define ACTION_RMODS_KEY(mods, key)     ACTION(ACT_RMODS,    (mods)<<8 | (key))
#define ACTION_RMODS_ONESHOT(mods)      ACTION(ACT_RMODS,    (mods)<<8 | 0x01)
#define ACTION_RMODS_SWITCH(mods, tap)  ACTION(ACT_RMODS,    (mods)<<8 | 0xF0 | (tap))
#define ACTION_RMODS_TOGGLE(mods, tap)  ACTION(ACT_RMODS,    (mods)<<8 | 0xF1 | (tap))
/* Mods + Tap key */
#define ACTION_LMODS_TAP(mods, key)     ACTION(ACT_LMODS_TAP, MOD_BITS(mods)<<8 | (key))
#define ACTION_RMODS_TAP(mods, key)     ACTION(ACT_RMODS_TAP, MOD_BITS(mods)<<8 | (key))

/* Layer Switch */
#define ACTION_LAYER_SET_ON_PRESSED(layer)   ACTION(ACT_LAYER_PRESSED,  (layer)<<8 | 0x00)
#define ACTION_LAYER_SET_ON_RELEASED(layer)  ACTION(ACT_LAYER_RELEASED, (layer)<<8 | 0x00)
#define ACTION_LAYER_BIT(bits)               ACTION(ACT_LAYER_BIT,      (layer)<<8 | 0x00)
#define ACTION_LAYER_TO_DEFAULT_ON_PRESSED   ACTION(ACT_LAYER_EXT,      0x0<<8     | 0x00)
#define ACTION_LAYER_TO_DEFAULT_ON_RELEASED  ACTION(ACT_LAYER_EXT,      0x1<<8     | 0x00)

#define ACTION_LAYER_TAP_TOGGLE(layer)      ACTION(ACT_LAYER_PRESSED, (layer)<<8 | 0xF0)
#define ACTION_LAYER_BIT_TAP_TOGGLE(layer)  ACTION(ACT_LAYER_BIT,     (layer)<<8 | 0xF0)
#define ACTION_LAYER_DEFAULT_TAP_TOGGLE     ACTION(ACT_LAYER_EXT,     0x0<<8     | 0xF0)

#define ACTION_LAYER_DEFAULT_SET_ON_PRESSED(layer)   ACTION(ACT_LAYER_PRESSED, (layer)<<8 | 0xFF)
#define ACTION_LAYER_DEFAULT_SET_ON_RELEASED(layer)  ACTION(ACT_LAYER_RELEASED, (layer)<<8 | 0xFF)
#define ACTION_LAYER_DEFAULT_BIT(bits)               ACTION(ACT_LAYER_BIT, (bits)<<8 | 0xFF)
#define ACTION_LAYER_DEFAULT_SET_CURRENT_ON_PRESSED  ACTION(ACT_LAYER_EXT, 0x0<<8    | 0xFF)
#define ACTION_LAYER_DEFAULT_SET_CURRENT_ON_RELEASED ACTION(ACT_LAYER_EXT, 0x1<<8    | 0xFF)

#define ACTION_LAYER_SET_TAP_KEY(layer, key)  ACTION(ACT_LAYER_PRESSED, (layer)<<8 | (key))
#define ACTION_LAYER_BIT_TAP_KEY(bits, key)   ACTION(ACT_LAYER_BIT,     (layer)<<8 | (key))
#define ACTION_LAYER_DEFAULT_SET_TAP_KEY(key) ACTION(ACT_LAYER_EXT,     0x0<<8     | (key))

/* HID Usage */
#define ACTION_USAGE_PAGE_SYSTEM        0
#define ACTION_USAGE_PAGE_CONSUMER      1
#define ACTION_USAGE_SYSTEM(id)         ACTION(ACT_USAGE,    ACTION_USAGE_PAGE_SYSTEM<<10 | (id))
#define ACTION_USAGE_CONSUMER(id)       ACTION(ACT_USAGE,    ACTION_USAGE_PAGE_CONSUMER<<10 | (id))
/* Mousekey */
#define ACTION_MOUSEKEY(key)            ACTION(ACT_MOUSEKEY, key)
/* Macro */
#define ACTION_MACRO(opt, id)           ACTION(ACT_FUNCTION, (opt)<<8 | (addr))
/* Command */
#define ACTION_COMMAND(opt, id)         ACTION(ACT_COMMAND,  (opt)<<8 | (addr))
/* Function */
#define ACTION_FUNCTION(addr)           ACTION(ACT_FUNCTION, addr)


/* helpers for readability */
#define LAYER(layer)    (layer)
#define TAP(tap)        (tap)
#define DOUBLE_TAP      2
#define TRIPLE_TAP      3
#define QUADRUPLE_TAP   4
#define QUINTUPLE_TAP   5
#define DOWN(key)       (key)
#define UP(key)         STROKE_UP, (key)

#endif  /* ACTION_H */