#ifndef _TEXTLISTCOMPONENT_H_
#define _TEXTLISTCOMPONENT_H_

#include "../Renderer.h"
#include "../Font.h"
#include "../GuiComponent.h"
#include "../InputManager.h"
#include <vector>
#include <string>
#include <memory>
#include "../Sound.h"

//A graphical list. Supports multiple colors for rows and scrolling.
//TODO - add truncation to text rendering if name exceeds a maximum width (a trailing elipses, perhaps).
template <typename T>
class TextListComponent : public GuiComponent
{
public:
	TextListComponent(Window* window, int offsetX, int offsetY, Font* font);
	virtual ~TextListComponent();

	bool input(InputConfig* config, Input input);
	void update(int deltaTime);
	void render();

	void addObject(std::string name, T obj, unsigned int color = 0xFF0000);
	void clear();

	std::string getSelectedName();
	T getSelectedObject();
	int getSelection();
	void stopScrolling();
	bool isScrolling();

	void setSelectorColor(unsigned int selectorColor);
	void setSelectedTextColor(unsigned int selectedColor);
	void setCentered(bool centered);
	void setScrollSound(std::shared_ptr<Sound> & sound);
	void setTextOffsetX(int textoffsetx);

	int getObjectCount();
	T getObject(int i);
	void setSelection(int i);

	void setFont(Font* f);

private:
	static const int SCROLLDELAY = 507;
	static const int SCROLLTIME = 200;

	void scroll(); //helper method, scrolls in whatever direction scrollDir is

	int mScrollDir, mScrollAccumulator;
	bool mScrolling;

	Font* mFont;
	unsigned int mSelectorColor, mSelectedTextColorOverride;
	bool mDrawCentered;

	int mTextOffsetX;

	struct ListRow
	{
		std::string name;
		T object;
		unsigned int color;
	};

	std::vector<ListRow> mRowVector;
	int mSelection;
	std::shared_ptr<Sound> mScrollSound;
};

template <typename T>
TextListComponent<T>::TextListComponent(Window* window, int offsetX, int offsetY, Font* font) : GuiComponent(window)
{
	mSelection = 0;
	mScrollDir = 0;
	mScrolling = 0;
	mScrollAccumulator = 0;

	setOffset(Vector2i(offsetX, offsetY));

	mTextOffsetX = 0;

	mFont = font;
	mSelectorColor = 0x000000FF;
	mSelectedTextColorOverride = 0;
	mScrollSound = NULL;
	mDrawCentered = true;
}

template <typename T>
TextListComponent<T>::~TextListComponent()
{
}

template <typename T>
void TextListComponent<T>::render()
{
	const int cutoff = getOffset().y;
	const int entrySize = mFont->getHeight() + 5;

	int startEntry = 0;

	//number of entries that can fit on the screen simultaniously
	int screenCount = (Renderer::getScreenHeight() - cutoff) / entrySize;
	//screenCount -= 1;

	if((int)mRowVector.size() >= screenCount)
	{
		startEntry = mSelection - (int)(screenCount * 0.5);
		if(startEntry < 0)
			startEntry = 0;
		if(startEntry >= (int)mRowVector.size() - screenCount)
			startEntry = mRowVector.size() - screenCount;
	}

	int y = cutoff;

	if(mRowVector.size() == 0)
	{
		Renderer::drawCenteredText("The list is empty.", 0, y, 0xFF0000FF, mFont);
		return;
	}

	int listCutoff = startEntry + screenCount;
	if(listCutoff > (int)mRowVector.size())
		listCutoff = mRowVector.size();

	for(int i = startEntry; i < listCutoff; i++)
	{
		//draw selector bar
		if(mSelection == i)
		{
			Renderer::drawRect(getOffset().x, y, Renderer::getScreenWidth(), mFont->getHeight(), mSelectorColor);
		}

		ListRow row = mRowVector.at((unsigned int)i);

		if(mDrawCentered)
			Renderer::drawCenteredText(row.name, getOffset().x + mTextOffsetX, y, (mSelection == i && mSelectedTextColorOverride != 0) ? mSelectedTextColorOverride : row.color, mFont);
		else
			Renderer::drawText(row.name, getOffset().x + mTextOffsetX, y, (mSelection == i && mSelectedTextColorOverride != 0) ? mSelectedTextColorOverride : row.color, mFont);

		y += entrySize;
	}
}

template <typename T>
bool TextListComponent<T>::input(InputConfig* config, Input input)
{
	if(mRowVector.size() > 0)
	{
		if(input.value != 0)
		{
			if(config->isMappedTo("down", input))
			{
				mScrollDir = 1;
				scroll();
				return true;
			}

			if(config->isMappedTo("up", input))
			{
				mScrollDir = -1;
				scroll();
				return true;
			}
			if(config->isMappedTo("pagedown", input))
			{
				mScrollDir = 10;
				scroll();
				return true;
			}

			if(config->isMappedTo("pageup", input))
			{
				mScrollDir = -10;
				scroll();
				return true;
			}
		}else{
			//if((button == InputManager::DOWN && mScrollDir > 0) || (button == InputManager::PAGEDOWN && mScrollDir > 0) || (button == InputManager::UP && mScrollDir < 0) || (button == InputManager::PAGEUP && mScrollDir < 0))
			if(config->isMappedTo("down", input) || config->isMappedTo("up", input) || config->isMappedTo("pagedown", input) || config->isMappedTo("pageup", input))
			{
				stopScrolling();
			}
		}
	}

	return false;
}

template <typename T>
void TextListComponent<T>::stopScrolling()
{
	mScrollAccumulator = 0;
	mScrolling = false;
	mScrollDir = 0;
}

template <typename T>
void TextListComponent<T>::update(int deltaTime)
{
	if(mScrollDir != 0)
	{
		mScrollAccumulator += deltaTime;

		if(!mScrolling)
		{
			if(mScrollAccumulator >= SCROLLDELAY)
			{
				mScrollAccumulator = SCROLLTIME;
				mScrolling = true;
			}
		}

		if(mScrolling)
		{
			mScrollAccumulator += deltaTime;

			while(mScrollAccumulator >= SCROLLTIME)
			{
				mScrollAccumulator -= SCROLLTIME;

				scroll();
			}
		}
	}
}

template <typename T>
void TextListComponent<T>::scroll()
{
	mSelection += mScrollDir;

	if(mSelection < 0)
	{
		if(mScrollDir < -1)
			mSelection = 0;
		else
			mSelection += mRowVector.size();
	}
	if(mSelection >= (int)mRowVector.size())
	{
		if(mScrollDir > 1)
			mSelection = (int)mRowVector.size() - 1;
		else
			mSelection -= mRowVector.size();
	}

	if(mScrollSound)
		mScrollSound->play();
}

//list management stuff
template <typename T>
void TextListComponent<T>::addObject(std::string name, T obj, unsigned int color)
{
	ListRow row = {name, obj, color};
	mRowVector.push_back(row);
}

template <typename T>
void TextListComponent<T>::clear()
{
	mRowVector.clear();
	mSelection = 0;
}

template <typename T>
std::string TextListComponent<T>::getSelectedName()
{
	if((int)mRowVector.size() > mSelection)
		return mRowVector.at(mSelection).name;
	else
		return "";
}

template <typename T>
T TextListComponent<T>::getSelectedObject()
{
	if((int)mRowVector.size() > mSelection)
		return mRowVector.at(mSelection).object;
	else
		return NULL;
}

template <typename T>
int TextListComponent<T>::getSelection()
{
	return mSelection;
}

template <typename T>
bool TextListComponent<T>::isScrolling()
{
	return mScrollDir != 0;
}

template <typename T>
void TextListComponent<T>::setSelectorColor(unsigned int selectorColor)
{
	mSelectorColor = selectorColor;
}

template <typename T>
void TextListComponent<T>::setSelectedTextColor(unsigned int selectedColor)
{
	mSelectedTextColorOverride = selectedColor;
}

template<typename T>
void TextListComponent<T>::setCentered(bool centered)
{
	mDrawCentered = centered;
}

template<typename T>
void TextListComponent<T>::setTextOffsetX(int textoffsetx)
{
	mTextOffsetX = textoffsetx;
}

template <typename T>
int TextListComponent<T>::getObjectCount()
{
	return mRowVector.size();
}

template <typename T>
T TextListComponent<T>::getObject(int i)
{
	return mRowVector.at(i).object;
}

template <typename T>
void TextListComponent<T>::setSelection(int i)
{
	mSelection = i;
}

template <typename T>
void TextListComponent<T>::setScrollSound(std::shared_ptr<Sound> & sound)
{
	mScrollSound = sound;
}

template <typename T>
void TextListComponent<T>::setFont(Font* font)
{
	mFont = font;
}

#endif