///////////////////////////////////////////////////////////////
// Kenneth Ma
// CSE143 Summer 98
// Homework 2
// MY Screen client!
///////////////////////////////////////////////////////////////
 
#include "screen.h"
 
#include <fstream.h>
#include <string.h>
#include <stdlib.h>
 
const int BUFLENGTH = 80;
const int CMDLENGTH = 10;
 
void fatalError( char msg[] )
{
   cerr << msg << endl;
   exit( -1 );
}
 
/* readChar expects to read in something of the form 'c' where c is some
 * arbitrary character. it ignores all characters before the first '
 */
char readChar( istream& is )
{
   char ch;
   char ret;
 
   while( is.get( ch ) && (ch != '\'') );
 
   if( !is ) {
      fatalError( "Bad char" );
   }
 
   is.get( ret );
   is.get( ch );
 
   if( ch != '\'' ) {
      fatalError( "Bad char" );
   }
 
   return ret;
}
 
/* readText reads in text of the form "text" where text is some arbitrary 
 * character string
 */
bool readText( istream& is, char buf[] )
{
   char ch;
   int idx = 0;
 
   while( is.get( ch ) && (ch != '"') );
   while( is.get( ch ) ) {
      if( ch == '"' ) {
         buf[idx] = '\0';
         return true;
      } else {
         buf[ idx++ ] = ch;
      }
   }
 
   return false;
}
 
void printHelp(){
   cerr << "Valid commands:" << endl;
   cerr << "fill 'c'" << endl;
   cerr << "\t" << "Fill the entire screen with the character 'c'." << endl;
   cerr << "hline <column> <row> <length> 'c' " << endl;
   cerr << "\t" << "Draw a line from (<column>,<row>) to (<column>+<length>-1,<r
ow>)," << endl;
   cerr << "\t" << "made entirely out of the character 'c'." << endl;
   cerr << "vline <column> <row> <length> 'c' " << endl;
   cerr << "\t" << "Draw a line from (<column>,<row>) to (<column><,row>+<length
>-1)," << endl;
   cerr << "\t" << "made entirely out of the character 'c'." << endl;
   cerr << "rectangle <column> <row> <width> <height> 'c' " << endl;
   cerr << "\t" << "Draw a rectangle from (<column>,<row>) to" << endl;
   cerr << "\t" << "(<column>+<length>-1,<row>+<length>-1), filled with the char
acter 'c'. " << endl;
   cerr << "text <column> <row> \"some text to write\" " << endl;
   cerr << "\t" << "Write the text in the quotes starting at position (<column>,<row>)." << endl;
   cerr << "ctext <row> \"some text to write\" " << endl;
   cerr << "\t" << "Place the text in quotes centered on row <row>." << endl;
   cerr << "load <filename> " << endl;
   cerr << "\t" << "Replace the contents of the screen with the contents of <filename>." << endl;
   cerr << "\t" << "<filename> is given with no quotes, such as load BLAH.SCREEN" << endl;
   cerr << "save <filename> " << endl;
   cerr << "\t" << "Save the contents of the screen to a file given by <filename>. " << endl;
   cerr << "print " << endl;
   cerr << "\t" << "Print the screen to the console " << endl;
   cerr << "quit " << endl;
   cerr << "\t" << "Quit the program " << endl;
}
 
int main( void )
{
   char cmd[ CMDLENGTH ];
   char buf[ BUFLENGTH ];
   int col, row, width, height;
   char fill;
   Screen screen;
 
   while( cin >> cmd )
   {
      if( strcmp( cmd, "fill" ) == 0 ) {
         fill = readChar( cin );
         screen.fill( fill );
      } else if( strcmp( cmd, "hline" ) == 0 ) {
         cin >> col >> row >> width;
         fill = readChar( cin );
         if( !screen.horizontalLine( col, row, width, fill ) ) {
            cerr << "Error." << endl;
         }
      } else if( strcmp( cmd, "vline" ) == 0 ) {
         cin >> col >> row >> width;
         fill = readChar( cin );
         if( !screen.verticalLine( col, row, width, fill ) ) {
            cerr << "Error." << endl;
         }
      } else if( strcmp( cmd, "rectangle" ) == 0 ) {
		 cin >> col >> row >> width >> height;
         fill = readChar( cin );
         if( !screen.rectangle( col, row, width, height, fill ) ) {
            cerr << "Error." << endl;
         }
      } else if( strcmp( cmd, "text" ) == 0 ) {
         cin >> col >> row;
         readText( cin, buf );
         if( !screen.putText(col, row, buf) ){
            cerr << "Error." << endl;
         }
      } else if( strcmp( cmd, "ctext" ) == 0 ) {
         cin >> row;
         readText( cin, buf );
         if( !screen.putCenteredText(row, buf) ){
            cerr << "Error." << endl;
         }
      } else if( strcmp( cmd, "load" ) == 0 ) {
         cin >> buf;
         ifstream inFile(buf, ios::nocreate | ios::in);
 
         // If the file has been opened, then read it in
         if( inFile.is_open() ){
            screen.read(inFile);
 
            // otherwise, it's an error
         } else {
            cerr << "Error loading \"" << buf << "\"" << endl;
         }
         inFile.close();
      } else if( strcmp( cmd, "save" ) == 0 ) {
		cin >> buf;
		ofstream outFile(buf);

		// If the file has been opened, then print to it
		if( outFile.is_open() ){
			screen.print(outFile);

			// otherwise, it's an error
		} else {
			cerr << "Error saving to \"" << buf << "\"" << endl;
		}
      } else if( strcmp( cmd, "print" ) == 0 ) {
         screen.print(cout);
      } else if( strcmp( cmd, "quit" ) == 0 ) {
         exit(0);
      } else if( strcmp( cmd, "help" ) == 0 ) {
         printHelp();
      } else {
         // Tell the user the error of their ways
         cerr << "\"" << cmd << "\" is not a valid command" << endl;
         cerr << "Type \"help\" for a complete list of commands" << endl;
      }
   }
 
   return 0;
}