/*
 * Modification History
 *
 * 2001-October-29	Jason Rohrer
 * Created.
 *
 * 2001-November-2	Jason Rohrer
 * Added support for cursor position.
 * Added support for clicking to reposition the cursor.
 * Fixed an array out-of-bounds bug in the keyReleased function.
 */
 
 
#ifndef TEXT_FIELD_GL_INCLUDED
#define TEXT_FIELD_GL_INCLUDED 

#include "GUIComponentGL.h"
#include "TextGL.h"

#include "minorGems/graphics/Color.h"



/**
 * A text field for OpenGL-based GUIs.
 *
 * @author Jason Rohrer
 */
class TextFieldGL : public GUIComponentGL {


	public:



		/**
		 * Constructs a text field.
		 *
		 * @param inAnchorX the x position of the upper left corner
		 *   of this component.
		 * @param inAnchorY the y position of the upper left corner
		 *   of this component.
		 * @param inWidth the width of this component.
		 * @param inHeight the height of this component.
		 * @param inString the text to display in this text field.
		 *    Is copied internally, so must be destroyed
		 *    by caller if not const.
		 * @param inText the text object to use when drawing
		 *   this textField.  Must be destroyed by caller after
		 *   this class is destroyed.
		 * @param inBorderColor the color of this field's border.
		 *   Will be destroyed when this class is destroyed.
		 * @param inFocusedBorderColor the color of this field's border
		 *   when the field is focused.
		 *   Will be destroyed when this class is destroyed.
		 * @param inBackgroundColor the color of this field's background.
		 *   Will be destroyed when this class is destroyed.
		 * @param inCursorColor the color of this field's cursor line.
		 *   Will be destroyed when this class is destroyed.
		 */
		TextFieldGL(
			double inAnchorX, double inAnchorY, double inWidth,
			double inHeight, char *inString, TextGL *inText,
			Color *inBorderColor, Color *inFocusedBorderColor,
			Color *inBackgroundColor, Color *inCursorColor );


		
		~TextFieldGL();


		
		/**
		 * Sets the text displayed by this text field.
		 *
		 * @param inString the text to display in this text field.
		 *    Is copied internally, so must be destroyed
		 *    by caller if not const.
		 */
		void setText( char *inString );


		
		/**
		 * Gets the text displayed by this text field.
		 *
		 * @return the text to display in this textField.
		 *    Must not be destroyed or modified by caller.
		 */
		char *getText();


		
		// override functions in GUIComponentGL
		virtual void setFocus( char inFocus );
		virtual char isFocused();
		virtual void keyPressed( unsigned char inKey, double inX, double inY );
		virtual void specialKeyPressed( int inKey, double inX, double inY );
		virtual void keyReleased( unsigned char inKey,
								  double inX, double inY );
		virtual void specialKeyReleased( int inKey, double inX, double inY );

		virtual void mouseReleased( double inX, double inY );
		
		virtual void fireRedraw();


		
	protected:


		
		/**
		 * Adjusts the cursor position to bring it in bounds of the
		 * current string.
		 */
		void fixCursorPosition();

		
		
		TextGL *mText;

		char *mString;

		Color *mBorderColor;
		Color *mFocusedBorderColor;
		Color *mBackgroundColor;
		Color *mCursorColor;
		
		Color *mCurrentBorderColor;
		
		char mFocused;

		// cursor position, in number of characters
		int mCursorPosition;
	};



inline TextFieldGL::TextFieldGL(
	double inAnchorX, double inAnchorY, double inWidth,
	double inHeight, char *inString, TextGL *inText,
	Color *inBorderColor, Color *inFocusedBorderColor,
	Color *inBackgroundColor, Color *inCursorColor )
	: GUIComponentGL( inAnchorX, inAnchorY, inWidth, inHeight ),
	  mText( inText ), mString( NULL ),
	  mBorderColor( inBorderColor ),
	  mFocusedBorderColor( inFocusedBorderColor ),
	  mBackgroundColor( inBackgroundColor ),
	  mCursorColor( inCursorColor ),
	  mFocused( false ),
	  mCurrentBorderColor( inBorderColor ),
	  mCursorPosition( 0 ) {

	setText( inString );
	}



inline TextFieldGL::~TextFieldGL() {
	if( mString != NULL ) {
		delete [] mString;
		}

	delete mBorderColor;
	delete mFocusedBorderColor;
	delete mBackgroundColor;
	delete mCursorColor;
	}



inline void TextFieldGL::setText( char *inString ) {
	if( mString != NULL ) {
		delete [] mString;
		}
	int length = strlen( inString ) + 1;
	
	mString = new char[ length ];

	memcpy( mString, inString, length );
	}



inline char *TextFieldGL::getText() {
	return mString;
	}



inline void TextFieldGL::setFocus( char inFocus ) {
	mFocused = inFocus;

	if( mFocused ) {
		mCurrentBorderColor = mFocusedBorderColor;
		}
	else {
		mCurrentBorderColor = mBorderColor;
		}
	}



inline char TextFieldGL::isFocused() {
	return mFocused;
	}



inline void TextFieldGL::keyPressed(
	unsigned char inKey, double inX, double inY ) {
	}



inline void TextFieldGL::specialKeyPressed(
	int inKey, double inX, double inY ) {
	}



inline void TextFieldGL::keyReleased(
	unsigned char inKey, double inX, double inY ) {

	//printf( "key press: %d\n", inKey );
	
	// backspace and delete
	if( inKey == 127 || inKey == 8 ) {
		if( mCursorPosition != 0 ) {
			int length = strlen( mString );

			if( length != 0 ) {
				char *newString = new char[ length ];

				// copy mString up to the last char before the deleted char
				memcpy( newString, mString, mCursorPosition-1 );

				// copy the portion of mString after the deleted char
				// this will include the trailing \0
				memcpy( &( newString[mCursorPosition-1] ),
						&( mString[mCursorPosition] ),
						length - mCursorPosition + 1 );
			
				setText( newString );
			
				delete [] newString;

				mCursorPosition--;
				}
			}
		}
	// allowable character key, from space up to tilde
	else if( inKey >= 32 && inKey <= 126 ) {
		// add a character to our string

		int oldStringLength = strlen( mString ) + 2; 
		int length = oldStringLength + 2;
		
		char *newString = new char[ length ];

		
		if( mCursorPosition != 0 ) {
			// copy chars up to cursor position
			memcpy( newString, mString, mCursorPosition );
			}
		// copy chars after cursor position, including trailing \0
		memcpy( &( newString[mCursorPosition+1] ),
				&( mString[mCursorPosition] ),
				oldStringLength - mCursorPosition + 1 );

		// now stick in the inserted char
		newString[ mCursorPosition ] = inKey;
		
		setText( newString );
		
		delete [] newString;

		mCursorPosition++;
		}
	
	// else a non-valid key hit
	}



inline void TextFieldGL::specialKeyReleased(
	int inKey, double inX, double inY ) {

	switch( inKey ) {
		case GLUT_KEY_RIGHT:
			mCursorPosition++;
			break;
		case GLUT_KEY_LEFT:
			mCursorPosition--;
		default:
			break;
		}

	fixCursorPosition();
	}



inline void TextFieldGL::mouseReleased(
	double inX, double inY ) {

	if( isInside( inX, inY ) ) {

		mCursorPosition = (int)( 0.5 + strlen( mString ) *
								 ( inX - mAnchorX ) / mWidth );
		
		}

	}



inline void TextFieldGL::fixCursorPosition() {
	if( mCursorPosition < 0 ) {
		mCursorPosition = 0;
		}
	else {
		int stringLength = strlen( mString );
		if( mCursorPosition > stringLength ) {
			mCursorPosition = stringLength;
			}
		}
	}


		
inline void TextFieldGL::fireRedraw() {

	// draw the background 
	glColor3f( mBackgroundColor->r,
			   mBackgroundColor->g, mBackgroundColor->b );
	glBegin( GL_QUADS ); {
		glVertex2d( mAnchorX, mAnchorY );		
		glVertex2d( mAnchorX, mAnchorY + mHeight );

		glVertex2d( mAnchorX + mWidth, mAnchorY + mHeight );
		glVertex2d( mAnchorX + mWidth, mAnchorY ); 

		}
	glEnd();

	
	// draw the text
	mText->drawText( mString, mAnchorX, mAnchorY,
					 mWidth, mHeight );

	if( mFocused ) {
		// draw the cursor
		glColor3f( mCursorColor->r,
				   mCursorColor->g, mCursorColor->b );
		glBegin( GL_LINES ); {
			// here we assume that fonts are fixed-width
			double cursorViewX;
			int stringLength = strlen( mString );
			if( stringLength != 0 ) { 
				cursorViewX =
					mAnchorX +
					mWidth * ( mCursorPosition / (double)( stringLength ) );
				}
			else {
				cursorViewX = mAnchorX;
				}
			glVertex2d( cursorViewX, mAnchorY );		
			glVertex2d( cursorViewX, mAnchorY + mHeight );
			}
		glEnd();
		}
	
	
	// draw the border on top of the text and cursor
	glColor3f( mCurrentBorderColor->r,
			   mCurrentBorderColor->g, mCurrentBorderColor->b );
	glBegin( GL_LINE_LOOP ); {
		glVertex2d( mAnchorX, mAnchorY );		
		glVertex2d( mAnchorX, mAnchorY + mHeight );

		glVertex2d( mAnchorX + mWidth, mAnchorY + mHeight );
		glVertex2d( mAnchorX + mWidth, mAnchorY );
		}
	glEnd();

	
	}



#endif