'use strict';

const pig = require('@ocogeclub/pigpio');

let pi = -1;
let i2c_hand = -1;
exports.init = (i2c_bus, i2c_addr) => {
  if (pi < 0) pi = pig._pigpio_start('', '');
  if (i2c_hand < 0) pig._i2c_close(pi, i2c_hand);
  i2c_hand = pig._i2c_open(pi, i2c_bus, i2c_addr);
  pig._i2c_write_byte_data(pi, i2c_hand, 0x00, 0x00); //Normal mode
  pig._i2c_write_byte_data(pi, i2c_hand, 0x02, 0x00); //10FPS
}

exports.read_temp_array = () => {
  let linedata = [];
  for (let i = 0; i < 8; i++) {
    let data = pig._i2c_read_i2c_block_data(pi, i2c_hand, 0x80 + 0x10 * i, 16);
    let oneline = [];
    for (let j = 0; j < 8; j++) {
      oneline.push(((data[2 * j + 1] & 0x07) * 256 + data[2 * j]) * 0.25);
    }
    linedata.push(oneline);
  }
  return linedata;
}

exports.stop = () => {
  if (i2c_hand >= 0) {
    pig._i2c_close(pi, i2c_hand);
    i2c_hand = -1;
  }
  if (pi >= 0) {
    pig._pigpio_stop(pi);
    pi = -1;
  }
}

/*
* This code was ported from https://www.denshi.club/pc/raspi/5raspberry-pi-zeroiot381i2c-amg8833.html
*/