/*
Copyright 2013 Jun Wako <wakojun@gmail.com>

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/>.
*/

#pragma once

#include "modifiers.h"

/** \brief Action codes
 *
 * 16bit code: action_kind(4bit) + action_parameter(12bit)
 *
 * Key Actions(00xx)
 * -----------------
 * ACT_MODS(000r):
 * 000r|0000|0000 0000    No action code
 * 000r|0000|0000 0001    Transparent code
 * 000r|0000| keycode     Key
 * 000r|mods|0000 0000    Modifiers
 * 000r|mods| keycode     Modifiers+Key(Modified key)
 *   r: Left/Right flag(Left:0, Right:1)
 *
 * ACT_MODS_TAP(001r):
 * 001r|mods|0000 0000    Modifiers with OneShot
 * 001r|mods|0000 0001    Modifiers with tap toggle
 * 001r|mods|0000 00xx    (reserved)
 * 001r|mods| keycode     Modifiers with Tap Key(Dual role)
 *
 * Other Keys(01xx)
 * ----------------
 * ACT_USAGE(0100): TODO: Not needed?
 * 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)
 *
 * ACT_MOUSEKEY(0101): TODO: Merge these two actions to conserve space?
 * 0101|xxxx| keycode     Mouse key
 *
 * ACT_SWAP_HANDS(0110):
 * 0110|xxxx| keycode     Swap hands (keycode on tap, or options)
 *
 * 0111|xxxx xxxx xxxx    (reserved)
 *
 * Layer Actions(10xx)
 * -------------------
 * ACT_LAYER(1000):
 * 1000|oo00|pppE BBBB   Default Layer Bitwise operation
 *   oo:    operation(00:AND, 01:OR, 10:XOR, 11:SET)
 *   ppp:   4-bit chunk part(0-7)
 *   EBBBB: bits and extra bit
 * 1000|ooee|pppE BBBB   Layer Bitwise Operation
 *   oo:    operation(00:AND, 01:OR, 10:XOR, 11:SET)
 *   ppp:   4-bit chunk part(0-7)
 *   EBBBB: bits and extra bit
 *   ee:    on event(01:press, 10:release, 11:both)
 *
 * ACT_LAYER_MODS(1001):
 * 1001|LLLL| mods       Layer with modifiers held
 *
 * ACT_LAYER_TAP(101x):
 * 101E|LLLL| keycode    On/Off with tap key    (0x00-DF)[TAP]
 * 101E|LLLL|1110 mods   On/Off with modifiers  (0xE0-EF)[NOT TAP]
 * 101E|LLLL|1111 0000   Invert with tap toggle (0xF0)   [TAP]
 * 101E|LLLL|1111 0001   On/Off                 (0xF1)   [NOT TAP]
 * 101E|LLLL|1111 0010   Off/On                 (0xF2)   [NOT TAP]
 * 101E|LLLL|1111 0011   Set/Clear              (0xF3)   [NOT TAP]
 * 101E|LLLL|1111 0100   One Shot Layer         (0xF4)   [TAP]
 * 101E|LLLL|1111 xxxx   Reserved               (0xF5-FF)
 *   ELLLL: layer 0-31(E: extra bit for layer 16-31)
 */
enum action_kind_id {
    /* Key Actions */
    ACT_MODS      = 0b0000,
    ACT_LMODS     = 0b0000,
    ACT_RMODS     = 0b0001,
    ACT_MODS_TAP  = 0b0010,
    ACT_LMODS_TAP = 0b0010,
    ACT_RMODS_TAP = 0b0011,
    /* Other Keys */
    ACT_USAGE    = 0b0100,
    ACT_MOUSEKEY = 0b0101,
    /* One-hand Support */
    ACT_SWAP_HANDS = 0b0110,
    /* Layer Actions */
    ACT_LAYER         = 0b1000,
    ACT_LAYER_MODS    = 0b1001,
    ACT_LAYER_TAP     = 0b1010, /* Layer  0-15 */
    ACT_LAYER_TAP_EXT = 0b1011, /* Layer 16-31 */
};

/** \brief Action Code Struct
 *
 * NOTE:
 * In avr-gcc bit field seems to be assigned from LSB(bit0) to MSB(bit15).
 * AVR looks like a little endian in avr-gcc.
 * Not portable across compiler/endianness?
 *
 * Byte order and bit order of 0x1234:
 *   Big endian:                Little endian:
 *   --------------------       --------------------
 *   FEDC BA98  7654 3210       0123 4567  89AB CDEF
 *   0001 0010  0011 0100       0010 1100  0100 1000
 *     0x12       0x34            0x34       0x12
 */
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_bitop {
        uint8_t bits : 4;
        uint8_t xbit : 1;
        uint8_t part : 3;
        uint8_t on : 2;
        uint8_t op : 2;
        uint8_t kind : 4;
    } layer_bitop;
    struct action_layer_mods {
        uint8_t mods : 8;
        uint8_t layer : 4;
        uint8_t kind : 4;
    } layer_mods;
    struct action_layer_tap {
        uint8_t code : 8;
        uint8_t val : 5;
        uint8_t kind : 3;
    } layer_tap;
    struct action_usage {
        uint16_t code : 10;
        uint8_t  page : 2;
        uint8_t  kind : 4;
    } usage;
    struct action_swap {
        uint8_t code : 8;
        uint8_t opt : 4;
        uint8_t kind : 4;
    } swap;
} action_t;

/* action utility */
#define ACTION_NO 0
#define ACTION_TRANSPARENT 1
#define ACTION(kind, param) ((kind) << 12 | (param))

enum mods_codes {
    MODS_ONESHOT    = 0x00,
    MODS_TAP_TOGGLE = 0x01,
};
#define ACTION_KEY(key) ACTION(ACT_MODS, (key))
#define ACTION_MODS(mods) ACTION(ACT_MODS, ((mods)&0x1f) << 8 | 0)
#define ACTION_MODS_KEY(mods, key) ACTION(ACT_MODS, ((mods)&0x1f) << 8 | (key))
#define ACTION_MODS_TAP_KEY(mods, key) ACTION(ACT_MODS_TAP, ((mods)&0x1f) << 8 | (key))
#define ACTION_MODS_ONESHOT(mods) ACTION(ACT_MODS_TAP, ((mods)&0x1f) << 8 | MODS_ONESHOT)
#define ACTION_MODS_TAP_TOGGLE(mods) ACTION(ACT_MODS_TAP, ((mods)&0x1f) << 8 | MODS_TAP_TOGGLE)

/** \brief Other Keys
 */
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))
#define ACTION_MOUSEKEY(key) ACTION(ACT_MOUSEKEY, key)

/** \brief Layer Actions
 */
enum layer_param_on {
    ON_PRESS   = 1,
    ON_RELEASE = 2,
    ON_BOTH    = 3,
};

/** \brief Layer Actions
 */
enum layer_param_bit_op {
    OP_BIT_AND = 0,
    OP_BIT_OR  = 1,
    OP_BIT_XOR = 2,
    OP_BIT_SET = 3,
};

/** \brief Layer Actions
 */
enum layer_param_tap_op {
    OP_TAP_TOGGLE = 0xF0,
    OP_ON_OFF,
    OP_OFF_ON,
    OP_SET_CLEAR,
    OP_ONESHOT,
};
#define ACTION_LAYER_BITOP(op, part, bits, on) ACTION(ACT_LAYER, (op) << 10 | (on) << 8 | (part) << 5 | ((bits)&0x1f))
#define ACTION_LAYER_TAP(layer, key) ACTION(ACT_LAYER_TAP, (layer) << 8 | (key))
/* Default Layer */
#define ACTION_DEFAULT_LAYER_SET(layer) ACTION_DEFAULT_LAYER_BIT_SET((layer) / 4, 1 << ((layer) % 4))
/* Layer Operation */
#define ACTION_LAYER_CLEAR(on) ACTION_LAYER_BIT_AND(0, 0, (on))
#define ACTION_LAYER_MOMENTARY(layer) ACTION_LAYER_ON_OFF(layer)
#define ACTION_LAYER_TOGGLE(layer) ACTION_LAYER_INVERT(layer, ON_RELEASE)
#define ACTION_LAYER_INVERT(layer, on) ACTION_LAYER_BIT_XOR((layer) / 4, 1 << ((layer) % 4), (on))
#define ACTION_LAYER_ON(layer, on) ACTION_LAYER_BIT_OR((layer) / 4, 1 << ((layer) % 4), (on))
#define ACTION_LAYER_OFF(layer, on) ACTION_LAYER_BIT_AND((layer) / 4, ~(1 << ((layer) % 4)), (on))
#define ACTION_LAYER_GOTO(layer) ACTION_LAYER_SET(layer, ON_PRESS)
#define ACTION_LAYER_SET(layer, on) ACTION_LAYER_BIT_SET((layer) / 4, 1 << ((layer) % 4), (on))
#define ACTION_LAYER_ON_OFF(layer) ACTION_LAYER_TAP((layer), OP_ON_OFF)
#define ACTION_LAYER_OFF_ON(layer) ACTION_LAYER_TAP((layer), OP_OFF_ON)
#define ACTION_LAYER_SET_CLEAR(layer) ACTION_LAYER_TAP((layer), OP_SET_CLEAR)
#define ACTION_LAYER_ONESHOT(layer) ACTION_LAYER_TAP((layer), OP_ONESHOT)
#define ACTION_LAYER_MODS(layer, mods) ACTION(ACT_LAYER_MODS, (layer) << 8 | (mods))
/* With Tapping */
#define ACTION_LAYER_TAP_KEY(layer, key) ACTION_LAYER_TAP((layer), (key))
#define ACTION_LAYER_TAP_TOGGLE(layer) ACTION_LAYER_TAP((layer), OP_TAP_TOGGLE)
/* Bitwise Operation */
#define ACTION_LAYER_BIT_AND(part, bits, on) ACTION_LAYER_BITOP(OP_BIT_AND, (part), (bits), (on))
#define ACTION_LAYER_BIT_OR(part, bits, on) ACTION_LAYER_BITOP(OP_BIT_OR, (part), (bits), (on))
#define ACTION_LAYER_BIT_XOR(part, bits, on) ACTION_LAYER_BITOP(OP_BIT_XOR, (part), (bits), (on))
#define ACTION_LAYER_BIT_SET(part, bits, on) ACTION_LAYER_BITOP(OP_BIT_SET, (part), (bits), (on))
/* Default Layer Bitwise Operation */
#define ACTION_DEFAULT_LAYER_BIT_AND(part, bits) ACTION_LAYER_BITOP(OP_BIT_AND, (part), (bits), 0)
#define ACTION_DEFAULT_LAYER_BIT_OR(part, bits) ACTION_LAYER_BITOP(OP_BIT_OR, (part), (bits), 0)
#define ACTION_DEFAULT_LAYER_BIT_XOR(part, bits) ACTION_LAYER_BITOP(OP_BIT_XOR, (part), (bits), 0)
#define ACTION_DEFAULT_LAYER_BIT_SET(part, bits) ACTION_LAYER_BITOP(OP_BIT_SET, (part), (bits), 0)

/* OneHand Support */
enum swap_hands_param_tap_op {
    OP_SH_TOGGLE = 0xF0,
    OP_SH_TAP_TOGGLE,
    OP_SH_ON_OFF,
    OP_SH_OFF_ON,
    OP_SH_OFF,
    OP_SH_ON,
    OP_SH_ONESHOT,
};

#define ACTION_SWAP_HANDS() ACTION_SWAP_HANDS_ON_OFF()
#define ACTION_SWAP_HANDS_TOGGLE() ACTION(ACT_SWAP_HANDS, OP_SH_TOGGLE)
#define ACTION_SWAP_HANDS_TAP_TOGGLE() ACTION(ACT_SWAP_HANDS, OP_SH_TAP_TOGGLE)
#define ACTION_SWAP_HANDS_ONESHOT() ACTION(ACT_SWAP_HANDS, OP_SH_ONESHOT)
#define ACTION_SWAP_HANDS_TAP_KEY(key) ACTION(ACT_SWAP_HANDS, key)
#define ACTION_SWAP_HANDS_ON_OFF() ACTION(ACT_SWAP_HANDS, OP_SH_ON_OFF)
#define ACTION_SWAP_HANDS_OFF_ON() ACTION(ACT_SWAP_HANDS, OP_SH_OFF_ON)
#define ACTION_SWAP_HANDS_ON() ACTION(ACT_SWAP_HANDS, OP_SH_ON)
#define ACTION_SWAP_HANDS_OFF() ACTION(ACT_SWAP_HANDS, OP_SH_OFF)
