/* Copyright (C) 2010 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. 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 2 of the License, or
 * (at your option) any later version.
 *
 * 0 A.D. 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 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
CText
*/

#include "precompiled.h"
#include "GUI.h"
#include "CText.h"
#include "CGUIScrollBarVertical.h"

#include "lib/ogl.h"


//-------------------------------------------------------------------
//  Constructor / Destructor
//-------------------------------------------------------------------
CText::CText()
{
	AddSetting(GUIST_float,					"buffer_zone");
	AddSetting(GUIST_CGUIString,			"caption");
	AddSetting(GUIST_int,					"cell_id");
	AddSetting(GUIST_bool,					"clip");
	AddSetting(GUIST_CStrW,					"font");
	AddSetting(GUIST_bool,					"scrollbar");
	AddSetting(GUIST_CStr,					"scrollbar_style");
	AddSetting(GUIST_bool,					"scroll_bottom");
	AddSetting(GUIST_CGUISpriteInstance,	"sprite");
	AddSetting(GUIST_EAlign,				"text_align");
	AddSetting(GUIST_EVAlign,				"text_valign");
	AddSetting(GUIST_CColor,				"textcolor");
	AddSetting(GUIST_CStrW,					"tooltip");
	AddSetting(GUIST_CStr,					"tooltip_style");

	// Private settings
	AddSetting(GUIST_CStrW,					"_icon_tooltip");
	AddSetting(GUIST_CStr,					"_icon_tooltip_style");

	//GUI<bool>::SetSetting(this, "ghost", true);
	GUI<bool>::SetSetting(this, "scrollbar", false);
	GUI<bool>::SetSetting(this, "clip", true);

	// Add scroll-bar
	CGUIScrollBarVertical * bar = new CGUIScrollBarVertical();
	bar->SetRightAligned(true);
	bar->SetUseEdgeButtons(true);
	AddScrollBar(bar);

	// Add text
	AddText(new SGUIText());
}

CText::~CText()
{
}

void CText::SetupText()
{
	if (!GetGUI())
		return;

	ENSURE(m_GeneratedTexts.size()>=1);

	CStrW font;
	if (GUI<CStrW>::GetSetting(this, "font", font) != PSRETURN_OK || font.empty())
		// Use the default if none is specified
		// TODO Gee: (2004-08-14) Don't define standard like this. Do it with the default style.
		font = L"default";

	CGUIString caption;
	bool scrollbar;
	GUI<CGUIString>::GetSetting(this, "caption", caption);
	GUI<bool>::GetSetting(this, "scrollbar", scrollbar);

	float width = m_CachedActualSize.GetWidth();
	// remove scrollbar if applicable
	if (scrollbar && GetScrollBar(0).GetStyle())
		width -= GetScrollBar(0).GetStyle()->m_Width;


    float buffer_zone=0.f;
	GUI<float>::GetSetting(this, "buffer_zone", buffer_zone);
	*m_GeneratedTexts[0] = GetGUI()->GenerateText(caption, font, width, buffer_zone, this);

	if (! scrollbar)
		CalculateTextPosition(m_CachedActualSize, m_TextPos, *m_GeneratedTexts[0]);

	// Setup scrollbar
	if (scrollbar)
	{
		bool scrollbottom = false;
		GUI<bool>::GetSetting(this, "scroll_bottom", scrollbottom);

		// If we are currently scrolled to the bottom of the text,
		// then add more lines of text, update the scrollbar so we
		// stick to the bottom.
		// (Use 1.5px delta so this triggers the first time caption is set)
		bool bottom = false;
		if (scrollbottom && GetScrollBar(0).GetPos() > GetScrollBar(0).GetMaxPos() - 1.5f)
			bottom = true;

		GetScrollBar(0).SetScrollRange(m_GeneratedTexts[0]->m_Size.cy);
		GetScrollBar(0).SetScrollSpace(m_CachedActualSize.GetHeight());

		GetScrollBar(0).SetX(m_CachedActualSize.right);
		GetScrollBar(0).SetY(m_CachedActualSize.top);
		GetScrollBar(0).SetZ(GetBufferedZ());
		GetScrollBar(0).SetLength(m_CachedActualSize.bottom - m_CachedActualSize.top);

		if (bottom)
			GetScrollBar(0).SetPos(GetScrollBar(0).GetMaxPos());
	}
}

void CText::HandleMessage(SGUIMessage &Message)
{
	IGUIScrollBarOwner::HandleMessage(Message);
	//IGUITextOwner::HandleMessage(Message); <== placed it after the switch instead!

	switch (Message.type)
	{
	case GUIM_SETTINGS_UPDATED:
		if (Message.value == "scrollbar")
		{
			SetupText();
		}

		// Update scrollbar
		if (Message.value == "scrollbar_style")
		{
			CStr scrollbar_style;
			GUI<CStr>::GetSetting(this, Message.value, scrollbar_style);

			GetScrollBar(0).SetScrollBarStyle( scrollbar_style );

			SetupText();
		}

		break;

	case GUIM_MOUSE_WHEEL_DOWN:
		{
		GetScrollBar(0).ScrollPlus();
		// Since the scroll was changed, let's simulate a mouse movement
		//  to check if scrollbar now is hovered
		SGUIMessage msg(GUIM_MOUSE_MOTION);
		HandleMessage(msg);
		break;
		}
	case GUIM_MOUSE_WHEEL_UP:
		{
		GetScrollBar(0).ScrollMinus();
		// Since the scroll was changed, let's simulate a mouse movement
		//  to check if scrollbar now is hovered
		SGUIMessage msg(GUIM_MOUSE_MOTION);
		HandleMessage(msg);
		break;
		}
	case GUIM_LOAD:
		{
		GetScrollBar(0).SetX( m_CachedActualSize.right );
		GetScrollBar(0).SetY( m_CachedActualSize.top );
		GetScrollBar(0).SetZ( GetBufferedZ() );
		GetScrollBar(0).SetLength( m_CachedActualSize.bottom - m_CachedActualSize.top );

		CStr scrollbar_style;
		GUI<CStr>::GetSetting(this, "scrollbar_style", scrollbar_style);
		GetScrollBar(0).SetScrollBarStyle( scrollbar_style );
		}
		break;

	default:
		break;
	}

	IGUITextOwner::HandleMessage(Message);
}

void CText::Draw() 
{
	float bz = GetBufferedZ();

	// First call draw on ScrollBarOwner
	bool scrollbar;
	GUI<bool>::GetSetting(this, "scrollbar", scrollbar);

	if (scrollbar)
	{
		// Draw scrollbar
		IGUIScrollBarOwner::Draw();
	}

	if (GetGUI())
	{
		CGUISpriteInstance *sprite;
		int cell_id;
		bool clip;
		GUI<CGUISpriteInstance>::GetSettingPointer(this, "sprite", sprite);
		GUI<int>::GetSetting(this, "cell_id", cell_id);
		GUI<bool>::GetSetting(this, "clip", clip);

		GetGUI()->DrawSprite(*sprite, cell_id, bz, m_CachedActualSize);

		float scroll=0.f;
		if (scrollbar)
		{
			scroll = GetScrollBar(0).GetPos();
		}

		// Clipping area (we'll have to subtract the scrollbar)
		CRect cliparea;
		if (clip)
		{
			cliparea = m_CachedActualSize;

			if (scrollbar)
			{
				// subtract scrollbar from cliparea
				if (cliparea.right > GetScrollBar(0).GetOuterRect().left &&
					cliparea.right <= GetScrollBar(0).GetOuterRect().right)
					cliparea.right = GetScrollBar(0).GetOuterRect().left;

				if (cliparea.left >= GetScrollBar(0).GetOuterRect().left &&
					cliparea.left < GetScrollBar(0).GetOuterRect().right)
					cliparea.left = GetScrollBar(0).GetOuterRect().right;
			}
		}

		CColor color;
		GUI<CColor>::GetSetting(this, "textcolor", color);

		if (scrollbar)
			DrawText(0, color, m_CachedActualSize.TopLeft() - CPos(0.f, scroll), bz+0.1f, cliparea);
		else
			DrawText(0, color, m_TextPos, bz+0.1f, cliparea);
	}
}

bool CText::MouseOverIcon()
{
	std::vector<SGUIText*>::iterator text_it;
	std::list<SGUIText::SSpriteCall>::iterator sprite_it;

	for (text_it=m_GeneratedTexts.begin(); text_it!=m_GeneratedTexts.end(); ++text_it)
	{
		SGUIText* guitext = *text_it;

		for (sprite_it=guitext->m_SpriteCalls.begin(); sprite_it!=guitext->m_SpriteCalls.end(); ++sprite_it)
		{
			//Check mouse over sprite
			SGUIText::SSpriteCall spritecall = *sprite_it;

			if (spritecall.m_Area.PointInside(GetMousePos() - m_CachedActualSize.TopLeft()))
			{
				//If tooltip exists, set the property
				if(!spritecall.m_Tooltip.empty())
				{
					SetSetting("_icon_tooltip_style", spritecall.m_TooltipStyle);
					SetSetting("_icon_tooltip", spritecall.m_Tooltip);
				}

				return true;
			}
		}
	}

	return false;
}