/*
Copyright (c) 2005-2008 Lode Vandevenne
All rights reserved.

This file is part of Lode's Programming Interface.

Lode's Programming Interface is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Lode's Programming Interface is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Lode's Programming Interface.  If not, see <http://www.gnu.org/licenses/>.
*/


/*
text related GUI elements for lpi_gui

NOTE: some of these elements may currently be broken due to refactoring and will be fixed later

TODO: fix possible broken elements
*/

#ifndef LPI_GUI_TEXT_H_INCLUDED
#define LPI_GUI_TEXT_H_INCLUDED

#include "lpi_gui.h"

#include "lpi_color.h"
#include "lpi_event.h"
#include "lpi_texture.h"
#include "lpi_text.h"


namespace lpi
{
namespace gui
{

class InputLine : public Element//input text line
{
  private:
    //unsigned long titleLength;
    unsigned long cursor; //position of the cursor (0 = before first char)
    bool entered; //after you pressed enter!
    
  public:
    unsigned long l; //max length
    Markup markup;
    Markup titleMarkup;
    ColorRGB cursorColor;
    /*
    types:
    0: normal text line
    1: password (displays * instead of text)
    2: integer number
    */
    int type;
    int allowedChars; //0 enables all, enabling bits disables certain symbols, see the unicode input function
    std::string title;
    std::string text;
        
    InputLine();
    void make(int x, int y, unsigned long l,
              const Markup& markup = TS_W,
              int type = 0, int allowedChars = 0, const std::string& title = "", const Markup& titleMarkup = TS_W, const ColorRGB& cursorColor = RGB_White);
    
    virtual void drawWidget() const;
    virtual void handleWidget();

    void setText(const std::string& i_text);
    const std::string& getText() const;
    
    void setTitle(const std::string& i_title);
    const std::string& getTitle() const;
   
    void clear();
    //return values of check():
    /*
TODO: make proper getters here instead of check()
    0: the text string is empty, and the rest of the things below aren't true either
    &1: the text string is not empty
    &2: you pressed ENTER (to enter the text string!)
    &4: mouse pointer is inside
    &8: left mouse button is down
    */
    int check();
    int enter();
    int getInteger() const; //returns any integer number that may be in the string you typed
    int keyCheckIndex; //if you have multiple input lines and don't want interference for the key input, give them a differnt keyCheckIndex
};

/*
MultiLineText
text divided over multiple lines, and functions 
to let it create the lines in different ways, such as (including, but not limited to)

-use ascii 10 chars of the string for new lines
-break off between letters in limited rectangle
-break off between words in limited rectangle

the multiple line text is represented by an array of integers (line) containing the positions of the first letter of each new line

all functions that need to draw text this way HAVE to use this class from now on
*/
class MultiLineText
{
  private:
    std::vector<unsigned long> line; //if the value is -1, it's no new line, it means the end is reached
    std::vector<Markup> lineMarkup; //only used of useFormatting is true: then it has to remember the start-markup of every line, which will be generated at the start with the function generateLineMarkup
  public:
    std::string text;
    
    Markup markup; //the markup currently used
    
    bool char10; //if true, ascii code 10 will act as newline and ascii code 13 will be ignored
    bool useFormatting; //if true, the # codes of formatted text are used. See the printFormatted function for more about this!
    
    void resetLines();
    
    void splitWords(int width); //markup must be given to be able to calculate width ==> max amount of letters in one line
    void splitLetters(int width);
    void splitChar10(); //only make a new line at ascii code 10 characters
    
    void generateLineMarkup(); //only used it useFormatting is true
    
    void setText(const std::string& text);
    void addText(const std::string& text);
    
    unsigned long getNumLines() const;
    
    std::string getLine(unsigned long i) const; //returns string filled with only that line
    
    
    void draw(int x, int y, unsigned long startLine, unsigned long endLine) const;
    void draw(int x, int y) const;
    
    void cursorAtCharPos(unsigned long pos, unsigned long& cline, unsigned long& column) const;
    int charAtCursorPos(unsigned long cline, unsigned long column) const;
    
    MultiLineText();
};

//The String Stack
class StringStack
{
  public:
    int num; //max number of strings on your stringstack
    
    int next; //physical address of next string that'll be written
    int oldest; //physical address of oldest string that was written
    
    std::vector<std::string> text;
    
    StringStack();
    StringStack(int num);
    
    //void makeBuffer(int num);
    //void deleteBuffer();
    void make(int num);
    void push(const std::string& text);
    int increase(int pointer, int amount = 1);
    int decrease(int pointer, int amount = 1);
    int getNumText() const;
    const std::string& getOldest(int offset = 0);
    const std::string& getNewest(int offset = 0);
  private:
    int numFilled; //how much of the memory places are filled currently
};

//The console (only shows output text, use for example InputLine to input text into the console)
class Console : public Element
{
  private:
    int numLines; //how much actual lines does it take on screen
    mutable StringStack stack; //mutable because it changes while drawing this widget
    void calcNumLines(); //calculates number of lines from the current messages; to be recalculated when sizex changes or messages are pushed/popped

  public:
    int scroll; //how much lines away from the first line (= oldest) are you scrolled, note: line != message, message can be multiple lines big!
    int num; //max number of messages
    
    //for now, no special text markup yet. All text has the same color and format.
    Markup markup;
    
    int getNumLines() const;
    int getNumMessages() const;
    int getVisibleLines(const Markup& markup);
    virtual void drawWidget() const;
    
    void push(const std::string& text);
    Console();
    void make(int x, int y, int sizex, int sizey, int num, const Markup& markup = TS_W);
};

//The textarea: can show you a single multilinetext and allows you to scroll (if you use optional or separate scrollbar or something else)
class TextArea : public Element
{
  public:
    int scroll; //how much lines away from the first line
    
    MultiLineText text;
    
    Markup markup;
    
    int getNumLines() const;
    int getVisibleLines(const Markup& markup) const;
    virtual void drawWidget() const;
    virtual void handleWidget();
    virtual void resizeWidget();

    TextArea();
    void make(int x, int y, int sizex, int sizey, const std::string& text, const Markup& markup = TS_W);
    void setText(const std::string& text, const Markup& markup = TS_W);
    
    ///optional scrollbar
    Scrollbar scrollbar;
    bool scrollEnabled;
    void addScrollbar();
    void setScrollbarSize();
    
  protected:
    virtual Element* getAutoSubElement(unsigned long i);
};

class InputBox : public Element
{
  private:
    unsigned long cursor; //position of cursor in the text, column and line position will be calculated by the MultiLineText
    int textWidth; //sizex - width of the scrollbar
    int firstVisibleLine; //depends on the scrollbar position
    
    MultiLineText multiText;
    std::string text;
    
    void init();
    
  public:
    int maxLines;
    
    InputBox();
    void make(int x, int y, int sizex, int sizey, int maxLines, int border = 2, const Markup& markup = TS_B, BackPanel panel = COLORPANEL(RGB_White), const ColorRGB& cursorColor = RGB_Black);
    void makeScrollbar(const GuiSet* set = &builtInGuiSet);
    const std::string& getText() const { return text; }
    
    virtual void drawWidget() const;
    virtual void handleWidget();
    
    int border;
    
    //get the positions (relative to the area's x and y) of the text area
    int getLeftText() const;
    int getRightText() const;
    int getTopText() const;
    int getBottomText() const;
    int getTextAreaHeight() const;
    int getTextAreaWidth() const;
    int getLinesVisible() const; //how much lines of text are visible
    
    Scrollbar bar;
    
    BackPanel panel;
    
    Markup markup;
    ColorRGB cursorColor;
    
  protected:
    virtual Element* getAutoSubElement(unsigned long i);
};


class FormattedText : public Element
{
  public:
    Markup markup;
    virtual void drawWidget() const;
    FormattedText();
    void make(int x = 0, int y = 0, const std::string& text = "", const Markup& markup = TS_W);
    void setText(const std::string& text);
    const std::string& getText() const { return text; }
  private:
    std::string text;
};

} //namespace gui
} //namespace lpi

#endif