/*
Copyright 2012,2013 Jun Wako <[email protected]>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef ACTION_H
#define ACTION_H

#include "keyboard.h"
#include "keycode.h"


/* Struct to record event and tap count  */
typedef struct {
    keyevent_t  event;
    uint8_t     tap_count;
} keyrecord_t;

/* Action struct.
 *
 * In avr-gcc bit field seems to be assigned from LSB(bit0) to MSB(bit15).
 * AVR looks like a little endian in avr-gcc.
 *
 * NOTE: not portable across compiler/endianness?
 * 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;
        uint8_t  id     :4;
    } kind;
    struct action_key {
        uint8_t  code   :8;
        uint8_t  mods   :4;
        uint8_t  kind   :4;
    } key;
    struct action_layer {
        uint8_t  code   :8;
        uint8_t  val    :4;
        uint8_t  kind   :4;
    } layer;
    struct action_usage {
        uint16_t code   :10;
        uint8_t  page   :2;
        uint8_t  kind   :4;
    } usage;
    struct action_command {
        uint8_t  id     :8;
        uint8_t  opt    :4;
        uint8_t  kind   :4;
    } command;
    struct action_function {
        uint8_t  id     :8;
        uint8_t  opt    :4;
        uint8_t  kind   :4;
    } func;
} action_t;



/* layer used currently */
extern uint8_t current_layer;
/* layer to return or start with */
extern uint8_t default_layer;

/* Execute action per keyevent */
void action_exec(keyevent_t event);

/* action for key */
action_t action_for_key(uint8_t layer, key_t key);

/* user defined special function */
void action_function(keyrecord_t *record, uint8_t id, uint8_t opt);

/*
 * Utilities for actions.
 */
void register_code(uint8_t code);
void unregister_code(uint8_t code);
void add_mods(uint8_t mods);
void del_mods(uint8_t mods);
void set_mods(uint8_t mods);
void clear_keyboard(void);
void clear_keyboard_but_mods(void);
bool sending_anykey(void);
void layer_switch(uint8_t new_layer);
bool is_tap_key(key_t key);
bool waiting_buffer_has_anykey_pressed(void);



/*
 * Action codes
 * ============
 * 16bit code: action_kind(4bit) + action_parameter(12bit)
 *
 * Keyboard Keys
 * -------------
 * ACT_LMODS(0000):
 * 0000|0000|000000|00    No action
 * 0000|0000|000000|01    Transparent
 * 0000|0000| keycode     Key
 * 0000|mods|000000|00    Left mods
 * 0000|mods| keycode     Key & Left mods
 *
 * ACT_RMODS(0001):
 * 0001|0000|000000|00    No action(not used)
 * 0001|0000|000000|01    Transparent(not used)
 * 0001|0000| keycode     Key(no used)
 * 0001|mods|000000|00    Right mods
 * 0001|mods| keycode     Key & Right mods
 *
 * ACT_LMODS_TAP(0010):
 * 0010|mods|000000|00    Left mods OneShot
 * 0010|mods|000000|01    (reserved)
 * 0010|mods|000000|10    (reserved)
 * 0010|mods|000000|11    (reserved)
 * 0010|mods| keycode     Left mods + tap Key
 *
 * ACT_RMODS_TAP(0011):
 * 0011|mods|000000|00    Right mods OneShot
 * 0011|mods|000000|01    (reserved)
 * 0011|mods|000000|10    (reserved)
 * 0011|mods|000000|11    (reserved)
 * 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
 * ----------
 * TODO: can be combined with 'Other HID Usage'? to save action kind id.
 * ACT_MOUSEKEY(0110):
 * 0101|XXXX| keycode     Mouse key
 *
 *
 * Layer Actions
 * -------------
 * ACT_LAYER(1000):             Set layer
 * 1000|LLLL|0000 0000   set current layer on press and return to default on release(momentary)
 * 1000|LLLL|0000 0001   set current layer on press
 * 1000|LLLL|0000 0010   set current layer on release
 * 1000|LLLL|0000 0011   set current layer on both
 * 1000|LLLL| keycode    set current layer on hold and send key on tap
 * 1000|LLLL|1111 0000   set current layer on hold and toggle on several taps
 * 1000|DDDD|1111 1111   set default layer on press
 * L: 0 means default layer
 *
 * ACT_LAYER_BIT(1001):         Bit-op layer
 * 1001|BBBB|0000 0000   bit-on current layer on press and bit-off on release(momentary)
 * 1001|BBBB|0000 0001   bit-xor current layer on press
 * 1001|BBBB|0000 0010   bit-xor current layer on release
 * 1001|BBBB|0000 0011   bit-xor current layer on both
 * 1001|BBBB| keycode    bit-xor current layer on hold and send key on tap
 * 1001|BBBB|1111 0000   bit-xor current layer on hold and toggle on several taps
 * 1001|BBBB|1111 1111   bit-xor default layer on both
 *
 * ACT_LAYER_SWITCH:            Switch
 * 1011|LLLL|0000 0000   On on press and Off on release(momentary)
 * 1011|LLLL|0000 0001   Invert on press
 * 1011|LLLL|0000 0010   Invert on release
 * 1011|LLLL|0000 0011   Invert on both
 * 1011|LLLL| keycode    Invert on hold and send key on tap
 * 1011|LLLL|1111 0000   Invert on hold and toggle on several taps
 * 1011|LLLL|1111 1111   (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?
 * 1111|opt | id(8)      Function?
 *
 */
enum action_kind_id {
    ACT_LMODS           = 0b0000,
    ACT_RMODS           = 0b0001,
    ACT_LMODS_TAP       = 0b0010,
    ACT_RMODS_TAP       = 0b0011,

    ACT_USAGE           = 0b0100,
    ACT_MOUSEKEY        = 0b0101,

    ACT_LAYER           = 0b1000,
    ACT_LAYER_BIT       = 0b1001,
    ACT_LAYER_SWITCH    = 0b1011,

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


/* action utility */
#define ACTION_NO                       0
#define ACTION_TRANSPARENT              1
#define ACTION(kind, param)             ((kind)<<12 | (param))
#define MODS4(mods)                     (((mods)>>4 | (mods)) & 0x0F)

/*
 * Key
 */
#define ACTION_KEY(key)                 ACTION(ACT_LMODS,    key)
/* Mods & key */
#define ACTION_LMODS(mods)              ACTION(ACT_LMODS,    MODS4(mods)<<8 | 0x00)
#define ACTION_LMODS_KEY(mods, key)     ACTION(ACT_LMODS,    MODS4(mods)<<8 | (key))
#define ACTION_RMODS(mods)              ACTION(ACT_RMODS,    MODS4(mods)<<8 | 0x00)
#define ACTION_RMODS_KEY(mods, key)     ACTION(ACT_RMODS,    MODS4(mods)<<8 | (key))
#define ACTION_LMOD(mod)                ACTION(ACT_LMODS,    MODS4(MOD_BIT(mod))<<8 | 0x00)
#define ACTION_LMOD_KEY(mod, key)       ACTION(ACT_LMODS,    MODS4(MOD_BIT(mod))<<8 | (key))
#define ACTION_RMOD(mod)                ACTION(ACT_RMODS,    MODS4(MOD_BIT(mod))<<8 | 0x00)
#define ACTION_RMOD_KEY(mod, key)       ACTION(ACT_RMODS,    MODS4(MOD_BIT(mod))<<8 | (key))
/* Tap key */
enum mods_codes {
    MODS_ONESHOT           = 0x00,
};
#define ACTION_LMODS_TAP_KEY(mods, key) ACTION(ACT_LMODS_TAP, MODS4(mods)<<8 | (key))
#define ACTION_LMODS_ONESHOT(mods)      ACTION(ACT_LMODS_TAP, MODS4(mods)<<8 | MODS_ONESHOT)
#define ACTION_RMODS_TAP_KEY(mods, key) ACTION(ACT_RMODS_TAP, MODS4(mods)<<8 | (key))
#define ACTION_RMODS_ONESHOT(mods)      ACTION(ACT_RMODS_TAP, MODS4(mods)<<8 | MODS_ONESHOT)
#define ACTION_LMOD_TAP_KEY(mod, key)   ACTION(ACT_LMODS_TAP, MODS4(MOD_BIT(mod))<<8 | (key))
#define ACTION_LMOD_ONESHOT(mod)        ACTION(ACT_LMODS_TAP, MODS4(MOD_BIT(mod))<<8 | MODS_ONESHOT)
#define ACTION_RMOD_TAP_KEY(mod, key)   ACTION(ACT_RMODS_TAP, MODS4(MOD_BIT(mod))<<8 | (key))
#define ACTION_RMOD_ONESHOT(mod)        ACTION(ACT_RMODS_TAP, MODS4(MOD_BIT(mod))<<8 | MODS_ONESHOT)


/*
 * Layer switching
 */
enum layer_codes {
    LAYER_MOMENTARY = 0,
    LAYER_ON_PRESS = 1,
    LAYER_ON_RELEASE = 2,
    LAYER_ON_BOTH =3,
    LAYER_TAP_TOGGLE = 0xF0,
    LAYER_SET_DEFAULT_ON_PRESS = 0xFD,
    LAYER_SET_DEFAULT_ON_RELEASE = 0xFE,
    LAYER_SET_DEFAULT_ON_BOTH = 0xFF
};
/*
 * Default layer
 */
/* set default layer */
#define ACTION_LAYER_SET_DEFAULT(layer)         ACTION_LAYER_SET_DEFAULT_R(layer)
#define ACTION_LAYER_SET_DEFAULT_P(layer)       ACTION(ACT_LAYER, (layer)<<8 | LAYER_SET_DEFAULT_ON_PRESS)
#define ACTION_LAYER_SET_DEFAULT_R(layer)       ACTION(ACT_LAYER, (layer)<<8 | LAYER_SET_DEFAULT_ON_RELEASE)
#define ACTION_LAYER_SET_DEFAULT_B(layer)       ACTION(ACT_LAYER, (layer)<<8 | LAYER_SET_DEFAULT_ON_BOTH)
/* bit-xor default layer */
#define ACTION_LAYER_BIT_DEFAULT(bits)          ACTION_LAYER_BIT_DEFAULT_R(bits)
#define ACTION_LAYER_BIT_DEFAULT_P(bits)        ACTION(ACT_LAYER, (bits)<<8 | LAYER_SET_DEFAULT_ON_PRESS)
#define ACTION_LAYER_BIT_DEFAULT_R(bits)        ACTION(ACT_LAYER, (bits)<<8 | LAYER_SET_DEFAULT_ON_RELEASE)
#define ACTION_LAYER_BIT_DEFAULT_B(bits)        ACTION(ACT_LAYER, (bits)<<8 | LAYER_SET_DEFAULT_ON_BOTH)
/*
 * Current layer: Return to default layer
 */
#define ACTION_LAYER_DEFAULT                    ACTION_LAYER_DEFAULT_R
#define ACTION_LAYER_DEFAULT_P                  ACTION_LAYER_SET_P(0)
#define ACTION_LAYER_DEFAULT_R                  ACTION_LAYER_SET_R(0)
#define ACTION_LAYER_DEFAULT_B                  ACTION_LAYER_SET_B(0)
/*
 * Current layer: Set
 */
#define ACTION_LAYER_SET(layer)                 ACTION_LAYER_SET_P(layer)
#define ACTION_LAYER_SET_MOMENTARY(layer)       ACTION(ACT_LAYER, (layer)<<8 | LAYER_MOMENTARY)
#define ACTION_LAYER_SET_TOGGLE(layer)          ACTION_LAYER_SET_R(layer)
#define ACTION_LAYER_SET_P(layer)               ACTION(ACT_LAYER, (layer)<<8 | LAYER_ON_PRESS)
#define ACTION_LAYER_SET_R(layer)               ACTION(ACT_LAYER, (layer)<<8 | LAYER_ON_RELEASE)
#define ACTION_LAYER_SET_B(layer)               ACTION(ACT_LAYER, (layer)<<8 | LAYER_ON_BOTH)
#define ACTION_LAYER_SET_TAP_TOGGLE(layer)      ACTION(ACT_LAYER, (layer)<<8 | LAYER_TAP_TOGGLE)
#define ACTION_LAYER_SET_TAP_KEY(layer, key)    ACTION(ACT_LAYER, (layer)<<8 | (key))
/*
 * Current layer: Bit-op
 */
#define ACTION_LAYER_BIT(bits)                  ACTION_LAYER_BIT_MOMENTARY(bits)
#define ACTION_LAYER_BIT_MOMENTARY(bits)        ACTION(ACT_LAYER_BIT, (bits)<<8 | LAYER_MOMENTARY)
#define ACTION_LAYER_BIT_TOGGLE(bits)           ACTION_LAYER_BIT_R(bits)
#define ACTION_LAYER_BIT_P(bits)                ACTION(ACT_LAYER_BIT, (bits)<<8 | LAYER_ON_PRESS)
#define ACTION_LAYER_BIT_R(bits)                ACTION(ACT_LAYER_BIT, (bits)<<8 | LAYER_ON_RELEASE)
#define ACTION_LAYER_BIT_B(bits)                ACTION(ACT_LAYER_BIT, (bits)<<8 | LAYER_ON_BOTH)
#define ACTION_LAYER_BIT_TAP_TOGGLE(bits)       ACTION(ACT_LAYER_BIT, (bits)<<8 | LAYER_TAP_TOGGLE)
#define ACTION_LAYER_BIT_TAP_KEY(bits, key)     ACTION(ACT_LAYER_BIT, (bits)<<8 | (key))
/*
 * Layer SWITCH
 */
/* momentary */
#define ACTION_LAYER_SWITCH(layer)              ACTION_LAYER_SWITCH_MOMENTARY(layer)
#define ACTION_LAYER_SWITCH_MOMENTARY(layer)    ACTION(ACT_LAYER_SWITCH, (layer)<<8 | LAYER_MOMENTARY)
#define ACTION_LAYER_SWITCH_TOGGLE(layer)       ACTION_LAYER_SWITCH_R(layer)
#define ACTION_LAYER_SWITCH_P(layer)            ACTION(ACT_LAYER_SWITCH, (layer)<<8 | LAYER_ON_PRESS)
#define ACTION_LAYER_SWITCH_R(layer)            ACTION(ACT_LAYER_SWITCH, (layer)<<8 | LAYER_ON_RELEASE)
#define ACTION_LAYER_SWITCH_B(layer)            ACTION(ACT_LAYER_SWITCH, (layer)<<8 | LAYER_ON_BOTH)
#define ACTION_LAYER_SWITCH_TAP_TOGGLE(layer)   ACTION(ACT_LAYER_SWITCH, (layer)<<8 | LAYER_TAP_TOGGLE)
#define ACTION_LAYER_SWITCH_TAP_KEY(layer, key) ACTION(ACT_LAYER_SWITCH, (layer)<<8 | (key))


/*
 * HID Usage
 */
enum usage_pages {
    PAGE_SYSTEM,
    PAGE_CONSUMER
};
#define ACTION_USAGE_SYSTEM(id)         ACTION(ACT_USAGE, PAGE_SYSTEM<<10 | (id))
#define ACTION_USAGE_CONSUMER(id)       ACTION(ACT_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 */
enum function_opts {
    FUNC_TAP        = 0x8,      /* indciates function is tappable */
};
#define ACTION_FUNCTION(id, opt)        ACTION(ACT_FUNCTION, (opt)<<8 | id)
#define ACTION_FUNCTION_TAP(id)         ACTION(ACT_FUNCTION, FUNC_TAP<<8 | id)

#endif  /* ACTION_H */