/*

Copyright 2013 Oleg Kostyuk <cub.uanic@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 <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include "wait.h"
#include "action_layer.h"
#include "print.h"
#include "debug.h"
#include "util.h"
#include "debounce.h"
#include QMK_KEYBOARD_H
#ifdef DEBUG_MATRIX_SCAN_RATE
#   include  "timer.h"
#endif

#ifdef BALLER
#include <avr/interrupt.h>
#include "pointing_device.h"
#endif

#ifndef DEBOUNCE
#   define DEBOUNCE	5
#endif

// MCP Pin Defs
#define RROW1 (1<<3)
#define RROW2 (1<<2)
#define RROW3 (1<<1)
#define RROW4 (1<<0)
#define COL0 (1<<0)
#define COL1 (1<<1)
#define COL2 (1<<2)
#define COL3 (1<<3)
#define COL4 (1<<4)
#define COL5 (1<<5)
#define COL6 (1<<6)

// ATmega pin defs
#define ROW1  (1<<6)
#define ROW2  (1<<5)
#define ROW3  (1<<4)
#define ROW4  (1<<1)
#define COL7 (1<<0)
#define COL8 (1<<1)
#define COL9 (1<<2)
#define COL10 (1<<3)
#define COL11 (1<<2)
#define COL12 (1<<3)
#define COL13 (1<<6)

//Trackball pin defs
#define TRKUP (1<<4)
#define TRKDN (1<<5)
#define TRKLT (1<<6)
#define TRKRT (1<<7)
#define TRKBTN (1<<6)


// Multiple for mouse moves
#ifndef TRKSTEP
#define TRKSTEP 20
#endif

// multiple for mouse scroll
#ifndef SCROLLSTEP
#define SCROLLSTEP 5
#endif

// bit masks
#define BMASK     (COL7 | COL8 | COL9 | COL10)
#define CMASK     (COL13)
#define DMASK     (COL11 | COL12)
#define FMASK     (ROW1 | ROW2 | ROW3 | ROW4)
#define RROWMASK  (RROW1 | RROW2 | RROW3 | RROW4)
#define MCPMASK   (COL0 | COL1 | COL2 | COL3 | COL4 | COL5 | COL6)
#define TRKMASK   (TRKUP | TRKDN | TRKRT | TRKLT)

// Trackball interrupts accumulate over here. Processed on scan
// Stores prev state of mouse, high bits store direction
uint8_t trkState    = 0;
uint8_t trkBtnState = 0;

volatile uint8_t tbUpCnt  = 0;
volatile uint8_t tbDnCnt  = 0;
volatile uint8_t tbLtCnt  = 0;
volatile uint8_t tbRtCnt  = 0;

/* matrix state(1:on, 0:off) */
static matrix_row_t matrix[MATRIX_ROWS];
/*
 * matrix state(1:on, 0:off)
 * contains the raw values without debounce filtering of the last read cycle.
 */
static matrix_row_t raw_matrix[MATRIX_ROWS];

// Debouncing: store for each key the number of scans until it's eligible to
// change.  When scanning the matrix, ignore any changes in keys that have
// already changed in the last DEBOUNCE scans.

static matrix_row_t read_cols(uint8_t row);
static void         init_cols(void);
static void         unselect_rows(void);
static void         select_row(uint8_t row);
static void enableInterrupts(void);

static uint8_t mcp23018_reset_loop;
// static uint16_t mcp23018_reset_loop;

#ifdef DEBUG_MATRIX_SCAN_RATE
uint32_t matrix_timer;
uint32_t matrix_scan_count;
#endif


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

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

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

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

inline uint8_t matrix_rows(void) { return MATRIX_ROWS; }

inline uint8_t matrix_cols(void) { return MATRIX_COLS; }


void matrix_init(void) {
    // initialize row and col
    mcp23018_status = init_mcp23018();
    unselect_rows();
    init_cols();

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

#ifdef DEBUG_MATRIX_SCAN_RATE
    matrix_timer      = timer_read32();
    matrix_scan_count = 0;
#endif
    debounce_init(MATRIX_ROWS);
    matrix_init_quantum();
}

void matrix_power_up(void) {
    mcp23018_status = init_mcp23018();

    unselect_rows();
    init_cols();

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

#ifdef DEBUG_MATRIX_SCAN_RATE
    matrix_timer      = timer_read32();
    matrix_scan_count = 0;
#endif

}

// Reads and stores a row, returning
// whether a change occurred.
static inline bool store_raw_matrix_row(uint8_t index) {
  matrix_row_t temp = read_cols(index);
  if (raw_matrix[index] != temp) {
    raw_matrix[index] = temp;
    return true;
  }
  return false;
}



uint8_t matrix_scan(void) {
    // TODO: Find what is trashing interrupts
    enableInterrupts();

    // First we handle the mouse inputs
#ifdef BALLER
    uint8_t pBtn   = PINE & TRKBTN;

    #ifdef DEBUG_BALLER
    // Compare to previous, mod report
    if (tbUpCnt + tbDnCnt + tbLtCnt + tbRtCnt != 0)
        xprintf("U: %d D: %d L: %d R: %d B: %d\n", tbUpCnt, tbDnCnt, tbLtCnt, tbRtCnt, (trkBtnState >> 6));
    #endif

    // Modify the report
    report_mouse_t pRprt = pointing_device_get_report();

    // Scroll by default, move on layer
    if (layer_state == 0) {
		  pRprt.h += tbLtCnt * SCROLLSTEP; tbLtCnt = 0;
		  pRprt.h -= tbRtCnt * SCROLLSTEP; tbRtCnt = 0;
		  pRprt.v -= tbUpCnt * SCROLLSTEP; tbUpCnt = 0;
		  pRprt.v += tbDnCnt * SCROLLSTEP; tbDnCnt = 0;
    } else {
		  pRprt.x -= tbLtCnt * TRKSTEP * (layer_state - 1); tbLtCnt = 0;
		  pRprt.x += tbRtCnt * TRKSTEP * (layer_state - 1); tbRtCnt = 0;
		  pRprt.y -= tbUpCnt * TRKSTEP * (layer_state - 1); tbUpCnt = 0;
		  pRprt.y += tbDnCnt * TRKSTEP * (layer_state - 1); tbDnCnt = 0;
    }

#ifdef DEBUG_BALLER
    if (pRprt.x != 0 || pRprt.y != 0)
        xprintf("X: %d Y: %d\n", pRprt.x, pRprt.y);
#endif

    if ((pBtn != trkBtnState) && ((pBtn >> 6) == 0))  pRprt.buttons |= MOUSE_BTN1;
    if ((pBtn != trkBtnState) && ((pBtn >> 6) == 1))  pRprt.buttons &= ~MOUSE_BTN1;

    // Save state, push update
    if (pRprt.x != 0 || pRprt.y != 0 || pRprt.h != 0 || pRprt.v != 0 || (trkBtnState != pBtn))
        pointing_device_set_report(pRprt);

    trkBtnState = pBtn;
#endif

    // Then the keyboard
    if (mcp23018_status) {  // if there was an error
        if (++mcp23018_reset_loop == 0) {
            // if (++mcp23018_reset_loop >= 1300) {
            // since mcp23018_reset_loop is 8 bit - we'll try to reset once in 255 matrix scans
            // this will be approx bit more frequent than once per second
            print("trying to reset mcp23018\n");
            mcp23018_status = init_mcp23018();
            if (mcp23018_status) {
                print("left side not responding\n");
            } else {
                print("left side attached\n");
            }
        }
    }

#ifdef DEBUG_MATRIX_SCAN_RATE
    matrix_scan_count++;

    uint32_t timer_now = timer_read32();
    if (TIMER_DIFF_32(timer_now, matrix_timer) > 1000) {
        print("matrix scan frequency: ");
        pdec(matrix_scan_count);
        print("\n");

        matrix_timer      = timer_now;
        matrix_scan_count = 0;
    }
#endif

    bool changed = false;
    for (uint8_t i = 0; i < MATRIX_ROWS_PER_SIDE; i++) {
        // select rows from left and right hands
        uint8_t left_index = i;
        uint8_t right_index = i + MATRIX_ROWS_PER_SIDE;
        select_row(left_index);
        select_row(right_index);

        // we don't need a 30us delay anymore, because selecting a
        // left-hand row requires more than 30us for i2c.

        changed |= store_raw_matrix_row(left_index);
        changed |= store_raw_matrix_row(right_index);

        unselect_rows();
    }

    debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
    matrix_scan_quantum();

    enableInterrupts();

#ifdef DEBUG_MATRIX
    for (uint8_t c = 0; c < MATRIX_COLS; c++)
		for (uint8_t r = 0; r < MATRIX_ROWS; r++)
		  if (matrix_is_on(r, c)) xprintf("r:%d c:%d \n", r, c);
#endif

    return 1;
}

bool matrix_is_modified(void) // deprecated and evidently not called.
{
    return true;
}

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

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

void matrix_print(void) {
    print("\nr/c 0123456789ABCDEF\n");
    for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
        phex(row); print(": ");
        pbin_reverse16(matrix_get_row(row));
        print("\n");
    }
}

uint8_t matrix_key_count(void) {
    uint8_t count = 0;
    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
        count += bitpop16(matrix[i]);
    }
    return count;
}

// Remember this means ROWS
static void  init_cols(void) {
    // init on mcp23018
    // not needed, already done as part of init_mcp23018()

    // Input with pull-up(DDR:0, PORT:1)
    DDRF  &= ~FMASK;
    PORTF |=  FMASK;
}

static matrix_row_t read_cols(uint8_t row) {
    if (row < 7) {
        if (mcp23018_status) { // if there was an error
            return 0;
        } else {
            uint8_t data = 0;
            mcp23018_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);    if (mcp23018_status) goto out;
            mcp23018_status = i2c_write(GPIOB, I2C_TIMEOUT);             if (mcp23018_status) goto out;
            mcp23018_status = i2c_start(I2C_ADDR_READ, I2C_TIMEOUT);     if (mcp23018_status) goto out;
            mcp23018_status = i2c_read_nack(I2C_TIMEOUT);                if (mcp23018_status < 0) goto out;
            data = ~((uint8_t)mcp23018_status);
            mcp23018_status = I2C_STATUS_SUCCESS;
        out:
            i2c_stop();

#ifdef DEBUG_MATRIX
            if (data != 0x00) xprintf("I2C: %d\n", data);
#endif
            return data;
        }
    } else {
         /* read from teensy
	        * bitmask is 0b0111001, but we want the lower four
	        * we'll return 1s for the top two, but that's harmless.
	        */
        // So I need to confuckulate all this
        //return ~(((PIND & DMASK) >> 1  | ((PINC & CMASK) >> 6) | (PIN)));
        //return ~((PINF & 0x03) | ((PINF & 0xF0) >> 2));
        return ~(
           (((PINF & ROW4) >> 1)
          | ((PINF & (ROW1 | ROW2 | ROW3)) >> 3))
        & 0xF);
    }
}

// Row pin configuration
static void unselect_rows(void)
{
    // no need to unselect on mcp23018, because the select step sets all
    // the other row bits high, and it's not changing to a different
    // direction
    // Hi-Z(DDR:0, PORT:0) to unselect
    DDRB  &= ~(BMASK | TRKMASK);
    PORTB &= ~(BMASK);
    DDRC  &= ~CMASK;
    PORTC &= ~CMASK;
    DDRD  &= ~DMASK;
    PORTD &= ~DMASK;

	// Fix trashing of DDRB for TB
    PORTB |= TRKMASK;
}

static void select_row(uint8_t row)
{
    if (row < 7) {
        // select on mcp23018
        if (mcp23018_status) { // do nothing on error
        } else { // set active row low  : 0 // set other rows hi-Z : 1
            mcp23018_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);        if (mcp23018_status) goto out;
            mcp23018_status = i2c_write(GPIOA, I2C_TIMEOUT);                 if (mcp23018_status) goto out;
            mcp23018_status = i2c_write(0xFF & ~(1<<row), I2C_TIMEOUT);      if (mcp23018_status) goto out;
        out:
            i2c_stop();
        }
    } else {
        // Output low(DDR:1, PORT:0) to select
        switch (row) {
            case 7:
                DDRB  |= COL7;
                PORTB &= ~COL7;
                break;
            case 8:
                DDRB  |= COL8;
                PORTB &= ~COL8;
                break;
            case 9:
                DDRB  |= COL9;
                PORTB &= ~COL9;
                break;
            case 10:
                DDRB  |= COL10;
                PORTB &= ~COL10;
                break;
            case 11:
                DDRD  |= COL11;
                PORTD &= ~COL11;
                break;
            case 12:
                DDRD  |= COL12;
                PORTD &= ~COL12;
                break;
            case 13:
                DDRC  |= COL13;
                PORTC &= ~COL13;
                break;
        }
    }
}


// Trackball Interrupts
static void enableInterrupts(void) {
    #ifdef BALLER
      // Set interrupt mask
      // Set port defs
      DDRB &= ~TRKMASK;
      PORTB |= TRKMASK;
      DDRE &= ~TRKBTN;
      PORTE |= TRKBTN;

      // Interrupt shenanigans
      //EIMSK |= (1 << PCIE0);
      PCMSK0 |= TRKMASK;
      PCICR |= (1 << PCIE0);
      sei();
    #endif

    return;
}
#ifdef BALLER
ISR (PCINT0_vect) {
  // Don't get fancy, we're in a interrupt here
  // PCINT reports a interrupt for a change on the bus
  // We hand the button at scantime for debounce
  volatile uint8_t pState = PINB & TRKMASK;
  if ((pState & TRKUP) != (trkState & TRKUP)) tbUpCnt++;
  if ((pState & TRKDN) != (trkState & TRKDN)) tbDnCnt++;
  if ((pState & TRKLT) != (trkState & TRKLT)) tbLtCnt++;
  if ((pState & TRKRT) != (trkState & TRKRT)) tbRtCnt++;
  trkState = pState;

}
#endif
