#include "SerialLCD.h"

void SerialLCD::begin(HardwareSerial *serial){
SER = serial;
SER->begin(9600);

}

void SerialLCD::print(char *theText){
  int delayTime = 50;
  SER->write(0xFE);   // command flag
  delay(delayTime);
  SER->write(128);    // start position for line 1
  if (strlen(theText) < 80) {
    // less than 80 characters, print then and then 
    SER->print(theText);
    // pad the rest of the line with spaces
    for (int i = strlen(theText); i < 80; i++) {
      SER->print(" ");
    } 
  } 
  else {  
    // 80 or more characters, just print the first 80
    for (int i = 0; i < 80; i++) {
      SER->print(theText[i]);
    }
  }
  delay(delayTime);
}


// displaySerLcdLine( line number, "text for that line")
// writes to each line separately
// lineNum is an integer for the line number. valid values 1 through 4
// *theText is a string of text and it gets padded at the end with spaces
// to overwrite whatever is already showing on that line. If you send more than
// 20 characters, it truncates the text.
void SerialLCD::printLine(int lineNum, char *theText){
  int delayTime = 50;
  int lcdPosition = 0;  // initialize lcdPosition and use to indicate value values

  // based upon the lineNum, set the position on the SER
  if (lineNum==1){
    lcdPosition = 128;
  }
  else if (lineNum==2){
    lcdPosition = 192;
  }
  else if (lineNum==3){
    lcdPosition = 148;
  }
  else if (lineNum==4){
    lcdPosition = 212;
  }

  // don't write to the SER if the lineNum value didn't generate a valid position
  if (lcdPosition > 0){
    SER->write(0xFE);   //command flag
    delay(delayTime);
    SER->write(lcdPosition);    //position

    if (strlen(theText) < 20) {
      // less than 20 characters, print then and then 
      SER->print(theText);
      // pad the rest of the line with spaces
      for (int i = strlen(theText); i < 20; i++) {
        SER->print(" ");
      } 
    } 
    else {  
      // 20 or more characters, just print the first 20
      for (int i = 0; i < 20; i++) {
        SER->print(theText[i]);
      }
    }
    delay(delayTime);
  }
}


// displaySerLcdChar(SER line, position on line, 'the character to display')
// SER line: integer 1 through 4
// position on line: integer 1 through 20
// character to display: a single character in single quotes
void SerialLCD::printChar(int lineNum, int charNum, char theChar){
  int delayTime = 50;
  int lcdPosition = 0;  // initialize lcdPosition and use to indicate value values

  // charNum has to be within 1 to 20, 
  // lineNum has to be within 1 to 4
  if (charNum > 0 && charNum < 21) {
    if (lineNum==1){
      lcdPosition = 128;
    }
    else if (lineNum==2){
      lcdPosition = 192;
    }
    else if (lineNum==3){
      lcdPosition = 148;
    }
    else if (lineNum==4){
      lcdPosition = 212;
    }
  }

  // don't write to the SER if the lineNum and charNum values were not within range
  if (lcdPosition > 0){
    // add to start of line position to get the position to write to
    lcdPosition = lcdPosition + charNum - 1;

    SER->write(0xFE);   //command flag
    delay(delayTime);
    SER->write(lcdPosition);    //position
    SER->print(theChar);
    delay(delayTime);
  }
}



void SerialLCD::clear(){
  SER->write(0xFE);   //command flag
  SER->write(0x01);   //clear command.
  delay(50);
}

void SerialLCD::backlight(int thePercentage){  //turns on the backlight
  SER->write(0x7C);   //command flag for backlight stuff
  int theValue = map(thePercentage, 0,100,128,157); // maps percentage to what SerSER wants to see
  SER->write(theValue);    //light level.
  delay(50);  
}