/*
Copyright 2012 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/>.
*/

#include "matrix.h"
#include "host.h"
#include "led.h"
#include "debug.h"
#include "wait.h"
#include "uart.h"

/*
 * Matrix Array usage:
 *
 * ROW: 16(4bits)
 * COL:  8(3bits)
 *
 *    8bit wide
 *   +---------+
 *  0|00 ... 07|
 *  1|08 ... 0F|
 *  :|   ...   |
 *  :|   ...   |
 *  E|70 ... 77|
 *  F|78 ... 7F|
 *   +---------+
 */
static uint8_t matrix[MATRIX_ROWS];
#define ROW(code)      ((code>>3)&0xF)
#define COL(code)      (code&0x07)

__attribute__ ((weak))
void matrix_init_kb(void) {
    matrix_init_user();
}

__attribute__ ((weak))
void matrix_scan_kb(void) {
    matrix_scan_user();
}

__attribute__ ((weak))
void matrix_init_user(void) {
}

__attribute__ ((weak))
void matrix_scan_user(void) {
}

inline
uint8_t matrix_rows(void)
{
    return MATRIX_ROWS;
}

inline
uint8_t matrix_cols(void)
{
    return MATRIX_COLS;
}

void matrix_init(void)
{
    /* gpio_set_pin_output(D6); */
    /* gpio_write_pin_high(D6); */
    debug_enable = true;

    uart_init(1200);

    // initialize matrix state: all keys off
    for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;

    /* // wait for keyboard coming up */
    /* // otherwise LED status update fails */
    /* print("Reseting "); */
    /* while (1) { */
    /*     print("."); */
    /*     while (uart_read()); */
    /*     uart_write(0x01); */
    /*     wait_ms(500); */
    /*     if (uart_read() == 0xFF) { */
    /*         wait_ms(500); */
    /*         if (uart_read() == 0x04) */
    /*             break; */
    /*     } */
    /* } */
    /* print(" Done\n"); */

    /* gpio_write_pin_low(D6) */

    matrix_init_kb();
    return;
}

uint8_t matrix_scan(void)
{
    uint8_t code;
    code = uart_read();
    if (!code) return 0;

    dprintf("%02X ", code);

    switch (code) {
        case 0xFF:  // reset success: FF 04
            print("reset: ");
            wait_ms(500);
            code = uart_read();
            xprintf("%02X\n", code);
            if (code == 0x04) {
                // LED status
                led_set(host_keyboard_leds());
            }
            return 0;
        case 0xFE:  // layout: FE <layout>
            print("layout: ");
            wait_ms(500);
            xprintf("%02X\n", uart_read());
            return 0;
        case 0x7E:  // reset fail: 7E 01
            print("reset fail: ");
            wait_ms(500);
            xprintf("%02X\n", uart_read());
            return 0;
        case 0x7F:
            // all keys up
            for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
            return 0;
    }

    if (code&0x80) {
        // break code
        if (matrix_is_on(ROW(code), COL(code))) {
            matrix[ROW(code)] &= ~(1<<COL(code));
        }
    } else {
        // make code
        if (!matrix_is_on(ROW(code), COL(code))) {
            matrix[ROW(code)] |=  (1<<COL(code));
        }
    }

    matrix_scan_kb();
    return code;
}

inline
bool matrix_has_ghost(void)
{
    return false;
}

inline
bool matrix_is_on(uint8_t row, uint8_t col)
{
    return (matrix[row] & (1<<col));
}

inline
uint8_t matrix_get_row(uint8_t row)
{
    return matrix[row];
}

void matrix_print(void)
{
    print("\nr/c 01234567\n");
    for (uint8_t row = 0; row < matrix_rows(); row++) {
        print_hex8(row); print(": ");
        print_bin_reverse8(matrix_get_row(row));
        print("\n");
    }
}
