/*

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 "wait.h"
#include "debug.h"
#include "util.h"
#include "debounce.h"
#include "gergo.h"

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

#ifndef DEBOUNCE
#    define DEBOUNCE 5
#endif

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

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

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

__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;
    }

    debounce_init();
    matrix_init_kb();
}

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;
    }
}

// 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");
            }
        }
    }

    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, changed);
    matrix_scan_kb();

    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;
}

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++) {
        print_hex8(row);
        print(": ");
        print_bin_reverse16(matrix_get_row(row));
        print("\n");
    }
}

// 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_read_register(I2C_ADDR, GPIOB, &data, 1, I2C_TIMEOUT);

#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
            uint8_t data    = 0xFF & ~(1 << row);
            mcp23018_status = i2c_write_register(I2C_ADDR, GPIOA, &data, 1, I2C_TIMEOUT);
        }
    } 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