// header files
#include "Console_IO_Utility.h"
#include <math.h>  // for trig functions

// global constants
const int DEGREES_IN_TRIANGLE = 180;
const double ANGEL_C_DEG = 90;
const double CONSTANT_PI = 3.141592654;


const int TWO_ENDLINES = 2;
const int TABLE_WIDTH = 35;
const int DATA_NAME_WIDTH = 16;
const int UNIT_WIDTH = 7;
const int VALUE_WIDTH = 8;

const char TOP_LINE[] = "===================================";
const char THICK_LINE_DIVIDER[] = "|=================================|";
const char THIN_LINE_DIVIDER[] = "|---------------------------------|";
const char PIPE_SPACE[] = "| ";
const char SPACE_PIPE[] = " |";

// prototypes
   // none

// main program
int main()
   {
    // initialize function/variables

       // initialize variables
       double sideA, sideB, sideC;
       double sqSideA, sqSideB, sqSideC;
       double cosAngleA, angleA_Rad, angleA_Deg;
       double angleB_Deg;

       // show title
          // function: printString, printEndline(s)
       printEndline();
       printString( "Right Triangle Angle Calculator" );
       printEndline();
       printString( "=========================" );
       printEndlines( TWO_ENDLINES );

    // get input

       // show expression, provide instructions
          // function: printString, printEndline(s)
       printString( "For any given triangle," );
       printEndline();
       printString( "Enter the side lengths below:" );
       printEndlines( TWO_ENDLINES );

       // get first coefficient
          // function: promptForDouble
       sideA = promptForDouble( "Enter side A: " );

       // get second coefficient
          // function: promptForDouble
       sideB = promptForDouble( "Enter side B: " );

    // process data
        // calculate sideA^2
           // function: pow
       sqSideA = pow(sideA, 2);

        // calculate sideB^2
           // function: pow
       sqSideB = pow(sideB, 2);

        // calculate sideC^2
       sqSideC = sqSideA + sqSideB;

        // calculate sideC
            // function: sqrt
       sideC = sqrt(sqSideC);

       // find angles
           // find angle A
       cosAngleA = sideB/sideC;

           // find angle in radians
             // function: acos
       angleA_Rad = acos(cosAngleA);

           // find angle A in degrees
       angleA_Deg = angleA_Rad*(DEGREES_IN_TRIANGLE/CONSTANT_PI);

           // find angle B in degrees
       angleB_Deg = ANGEL_C_DEG - angleA_Deg;


    // display results

       // print top line
          // function: printString, printEndline
       printEndline();
       printString( TOP_LINE );
       printEndline();

       // print title line
          // function: printCharacter, printStringJustified, printEndline
       printCharacter( PIPE );
       printStringJustified( "RIGHT TRIANGLE ANGLE CALCULATIONS",
                                                TABLE_WIDTH - 2, "CENTER" );
       printCharacter( PIPE );
       printEndline();

       // print thick divider line
          // function: printString, printEndline
       printString( THICK_LINE_DIVIDER );
       printEndline();

       // print sub title line
          // function: printStringJustified, printString, printCharacter
       printString( PIPE_SPACE );
       printStringJustified( "Data Name", DATA_NAME_WIDTH - 1, "LEFT" );
       printCharacter( PIPE );
       printStringJustified( "Units", UNIT_WIDTH, "CENTER" );
       printString( PIPE_SPACE );
       printStringJustified( "Values", VALUE_WIDTH - 2, "CENTER" );
       printString( SPACE_PIPE );
       printEndline();

       // print thin divider line
          // function: printString, printEndline
       printString( THIN_LINE_DIVIDER );
       printEndline();

       // print Side A line
       printString( PIPE_SPACE );
       printStringJustified( "Side A", DATA_NAME_WIDTH - 1, "LEFT" );
       printCharacter( PIPE );
       printStringJustified( "m", UNIT_WIDTH, "CENTER" );
       printCharacter( PIPE );
       printDoubleJustified( sideA, PRECISION, VALUE_WIDTH - 1, "RIGHT" );
       printString( SPACE_PIPE );
       printEndline();

       // print thin divider line
          // function: printString, printEndline
       printString( THIN_LINE_DIVIDER );
       printEndline();

       // print Side B line
       printString( PIPE_SPACE );
       printStringJustified( "Side B", DATA_NAME_WIDTH - 1, "LEFT" );
       printCharacter( PIPE );
       printStringJustified( "m", UNIT_WIDTH, "CENTER" );
       printCharacter( PIPE );
       printDoubleJustified( sideB, PRECISION, VALUE_WIDTH - 1, "RIGHT" );
       printString( SPACE_PIPE );
       printEndline();

       // print thin divider line
          // function: printString, printEndline
       printString( THIN_LINE_DIVIDER );
       printEndline();

       // print Side C line
       printString( PIPE_SPACE );
       printStringJustified( "Side C", DATA_NAME_WIDTH - 1, "LEFT" );
       printCharacter( PIPE );
       printStringJustified( "m", UNIT_WIDTH, "CENTER" );
       printCharacter( PIPE );
       printDoubleJustified( sideC, PRECISION, VALUE_WIDTH - 1, "RIGHT" );
       printString( SPACE_PIPE );
       printEndline();

       // print thick divider line
          // function: printString, printEndline
       printString( THICK_LINE_DIVIDER );
       printEndline();

       // print Angle a line
       printString( PIPE_SPACE );
       printStringJustified( "Angle a", DATA_NAME_WIDTH - 1, "LEFT" );
       printCharacter( PIPE );
       printStringJustified( "deg", UNIT_WIDTH, "CENTER" );
       printCharacter( PIPE );
       printDoubleJustified( angleA_Deg, PRECISION, VALUE_WIDTH - 1, "RIGHT" );
       printString( SPACE_PIPE );
       printEndline();

       // print thin divider line
          // function: printString, printEndline
       printString( THIN_LINE_DIVIDER );
       printEndline();

       // print Angle b line
       printString( PIPE_SPACE );
       printStringJustified( "Angle b", DATA_NAME_WIDTH - 1, "LEFT" );
       printCharacter( PIPE );
       printStringJustified( "deg", UNIT_WIDTH, "CENTER" );
       printCharacter( PIPE );
       printDoubleJustified( angleB_Deg, PRECISION, VALUE_WIDTH - 1, "RIGHT" );
       printString( SPACE_PIPE );
       printEndline();

       // print thin divider line
          // function: printString, printEndline
       printString( THIN_LINE_DIVIDER );
       printEndline();

       // print Angle c line
       printString( PIPE_SPACE );
       printStringJustified( "Angle c", DATA_NAME_WIDTH - 1, "LEFT" );
       printCharacter( PIPE );
       printStringJustified( "deg", UNIT_WIDTH, "CENTER" );
       printCharacter( PIPE );
       printDoubleJustified( ANGEL_C_DEG, PRECISION,
                                VALUE_WIDTH - 1, "RIGHT" );
       printString( SPACE_PIPE );
       printEndline();

       // print thick divider line
          // function: printString, printEndline
       printString( THICK_LINE_DIVIDER );
       printEndline();

    // end program

       // show end program
          // function: printString, printEndline
       printEndline();
       printString( "End Program" );
       printEndline();

       // return program success
       return 0;
   }


// supporting functions
   // none