/* Copyright 2019 Jason Williams (Wilba)
 *
 * 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 <tmk_core/common/eeconfig.h>  // for EECONFIG_SIZE

// Keyboard level code can change where VIA stores the magic.
// The magic is the build date YYMMDD encoded as BCD in 3 bytes,
// thus installing firmware built on a different date to the one
// already installed can be detected and the EEPROM data is reset.
// The only reason this is important is in case EEPROM usage changes
// and the EEPROM was not explicitly reset by bootmagic lite.
#ifndef VIA_EEPROM_MAGIC_ADDR
#    define VIA_EEPROM_MAGIC_ADDR (EECONFIG_SIZE)
#endif

#define VIA_EEPROM_LAYOUT_OPTIONS_ADDR (VIA_EEPROM_MAGIC_ADDR + 3)

// Changing the layout options size after release will invalidate EEPROM,
// but this is something that should be set correctly on initial implementation.
// 1 byte is enough for most uses (i.e. 8 binary states, or 6 binary + 1 ternary/quaternary )
#ifndef VIA_EEPROM_LAYOUT_OPTIONS_SIZE
#    define VIA_EEPROM_LAYOUT_OPTIONS_SIZE 1
#endif

// The end of the EEPROM memory used by VIA
// By default, dynamic keymaps will start at this if there is no
// custom config
#define VIA_EEPROM_CUSTOM_CONFIG_ADDR (VIA_EEPROM_LAYOUT_OPTIONS_ADDR + VIA_EEPROM_LAYOUT_OPTIONS_SIZE)

#ifndef VIA_EEPROM_CUSTOM_CONFIG_SIZE
#    define VIA_EEPROM_CUSTOM_CONFIG_SIZE 0
#endif

// This is changed only when the command IDs change,
// so VIA Configurator can detect compatible firmware.
#define VIA_PROTOCOL_VERSION 0x0009

enum via_command_id {
    id_get_protocol_version = 0x01,  // always 0x01
    id_get_keyboard_value,
    id_set_keyboard_value,
    id_dynamic_keymap_get_keycode,
    id_dynamic_keymap_set_keycode,
    id_dynamic_keymap_reset,
    id_backlight_config_set_value,
    id_backlight_config_get_value,
    id_backlight_config_save,
    id_eeprom_reset,
    id_bootloader_jump,
    id_dynamic_keymap_macro_get_count,
    id_dynamic_keymap_macro_get_buffer_size,
    id_dynamic_keymap_macro_get_buffer,
    id_dynamic_keymap_macro_set_buffer,
    id_dynamic_keymap_macro_reset,
    id_dynamic_keymap_get_layer_count,
    id_dynamic_keymap_get_buffer,
    id_dynamic_keymap_set_buffer,
    id_unhandled = 0xFF,
};

enum via_keyboard_value_id { id_uptime = 0x01, id_layout_options, id_switch_matrix_state };

// Can't use SAFE_RANGE here, it might change if someone adds
// new values to enum quantum_keycodes.
// Need to keep checking 0x5F10 is still in the safe range.
// TODO: merge this into quantum_keycodes
// Backlight keycodes are in range 0x5F00-0x5F0F
enum via_keycodes {
    FN_MO13 = 0x5F10,
    FN_MO23,
    MACRO00,
    MACRO01,
    MACRO02,
    MACRO03,
    MACRO04,
    MACRO05,
    MACRO06,
    MACRO07,
    MACRO08,
    MACRO09,
    MACRO10,
    MACRO11,
    MACRO12,
    MACRO13,
    MACRO14,
    MACRO15,
};

enum user_keycodes {
    USER00 = 0x5F80,
    USER01,
    USER02,
    USER03,
    USER04,
    USER05,
    USER06,
    USER07,
    USER08,
    USER09,
    USER10,
    USER11,
    USER12,
    USER13,
    USER14,
    USER15,
};

// Can be called in an overriding via_init_kb() to test if keyboard level code usage of
// EEPROM is invalid and use/save defaults.
bool via_eeprom_is_valid(void);

// Sets VIA/keyboard level usage of EEPROM to valid/invalid
// Keyboard level code (eg. via_init_kb()) should not call this
void via_eeprom_set_valid(bool valid);

// Flag QMK and VIA/keyboard level EEPROM as invalid.
// Used in bootmagic_lite() and VIA command handler.
// Keyboard level code should not need to call this.
void via_eeprom_reset(void);

// Called by QMK core to initialize dynamic keymaps etc.
void via_init(void);

// Used by VIA to store and retrieve the layout options.
uint32_t via_get_layout_options(void);
void     via_set_layout_options(uint32_t value);

// Called by QMK core to process VIA-specific keycodes.
bool process_record_via(uint16_t keycode, keyrecord_t *record);