/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * Copyright (c) 2004, 2005, 2006, 2007 Olof Naessén and Per Larsson
 *
 *                                                         Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naessén a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
 * Visit: http://guichan.darkbits.org             )Qk<P ` _: :+' .'  "{[
 *                                               .)j(] .d_/ '-(  P .   S
 * License: (BSD)                                <Td/Z <fP"5(\"??"\a.  .L
 * Redistribution and use in source and          _dV>ws?a-?'      ._/L  #'
 * binary forms, with or without                 )4d[#7r, .   '     )d`)[
 * modification, are permitted provided         _Q-5'5W..j/?'   -?!\)cam'
 * that the following conditions are met:       j<<WP+k/);.        _W=j f
 * 1. Redistributions of source code must       .$%w\/]Q  . ."'  .  mj$
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 */

#ifndef GCN_TEXTFIELD_HPP
#define GCN_TEXTFIELD_HPP

#include "guisan/keylistener.hpp"
#include "guisan/mouselistener.hpp"
#include "guisan/platform.hpp"
#include "guisan/widget.hpp"

#include <memory>
#include <string>

namespace gcn
{
    class Text;

    /**
     * An implementation of a text field where a user can enter a line of text.
     */
    class GCN_CORE_DECLSPEC TextField:
        public Widget,
        public MouseListener,
        public KeyListener
    {
    public:
        /**
         * Constructor.
         */
        TextField();

        /**
         * Constructor. The text field will be automatically resized
         * to fit the text.
         *
         * @param text The default text of the text field.
         */
        TextField(const std::string& text);

        /**
         * Destructor.
         */
        ~TextField() override;

        /**
         * Sets the text of the text field.
         *
         * @param text The text of the text field.
         * @see getText
         */
        void setText(const std::string& text);

        /**
         * Gets the text of the text field.
         *
         * @return The text of the text field.
         * @see setText
         */
        std::string getText() const;

        /**
         * Adjusts the size of the text field to fit the text.
         */
        void adjustSize();

        /**
         * Adjusts the height of the text field to fit caption.
         */
        void adjustHeight();

        /**
         * Checks if the text field is editable.
         *
         * @return True it the text field is editable, false otherwise.
         * @see setEditable
         */
        bool isEditable() const { return mEditable; }

        /**
         * Sets the text field to be editable or not. A text field is editable
         * by default.
         *
         * @param editable True if the text field should be editable, false
         *                 otherwise.
         */
        void setEditable(bool editable) { mEditable = editable; }

        /**
         * Sets the caret position. As there is only one line of text
         * in a text field the position is the caret's x coordinate.
         *
         * @param position The caret position.
         * @see getCaretPosition
         */
        void setCaretPosition(unsigned int position);

        /**
         * Gets the caret position. As there is only one line of text
         * in a text field the position is the caret's x coordinate.
         *
         * @return The caret position.
         * @see setCaretPosition
         */
        unsigned int getCaretPosition() const;

        // Inherited from Widget

        void draw(Graphics* graphics) override;
        void fontChanged() override;

        // Inherited from MouseListener

        void mousePressed(MouseEvent& mouseEvent) override;
        void mouseDragged(MouseEvent& mouseEvent) override;

        // Inherited from KeyListener

        void keyPressed(KeyEvent& keyEvent) override;

    protected:
        /**
         * Draws the caret. Overloaded this method if you want to
         * change the style of the caret.
         *
         * @param graphics the Graphics object to draw with.
         * @param x the caret's x-position.
         */
        virtual void drawCaret(Graphics* graphics, int x);

        /**
         * Scrolls the text horizontally so that the caret shows if needed.
         * The method is used any time a user types in the text field so the
         * caret always will be shown.
         */
        void fixScroll();

        /**
         * True if the text field is editable, false otherwise.
         */
        bool mEditable = true;

        /**
         * Holds the text of the text field.
         */
        std::unique_ptr<Text> mText;

        /**
         * Holds the amount scrolled in x. If a user types more characters than
         * the text field can display, due to the text field being to small, the
         * text needs to scroll in order to show the last type character.
         */
        int mXScroll = 0;
    };
}

#endif // end GCN_TEXTFIELD_HPP
