/*
	OmniaFramework - A collection of useful functionality
	Copyright (C) 2025  OmniaX-Dev

	This file is part of OmniaFramework.

	OmniaFramework 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.

	OmniaFramework 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 OmniaFramework.  If not, see <https://www.gnu.org/licenses/>.
*/

#include "ListView.hpp"
#include "../../render/BasicRenderer.hpp"
#include "../Window.hpp"
#include "../../../ostd/io/Memory.hpp"

namespace ogfx
{
	namespace gui
	{
		namespace widgets
		{
			void ListView::Item::setText(const String& text)
			{
				if (m_text == text)
					return;
				m_text = text;
				update_dimensions();
				if (m_parent) m_parent->m_extentsDirty = true;
			}

			void ListView::Item::setFontSize(i32 fontSize)
			{
				if (m_fontSize == fontSize)
					return;
				m_fontSize = fontSize;
				update_dimensions();
				if (m_parent) m_parent->m_extentsDirty = true;
			}

			void ListView::Item::update_dimensions(void)
			{
				if (!isValid())
					return;
				m_dimensions = m_parent->getWindow().getGFX().getStringDimensions(m_text, m_fontSize);
				m_dimensions += Vec2 { m_padding.x + m_padding.w, m_padding.y + m_padding.h };
			}

			void ListView::Item::set_selected(stdvec<Item*>& selectionList)
			{
				for (auto& sel : selectionList)
					sel->m_selected = false;
				selectionList.clear();
				selectionList.push_back(this);
				m_selected = true;
			}

			void ListView::Item::add_selected(stdvec<Item*>& selectionList)
			{
				if (STDVEC_CONTAINS(selectionList, this))
					return;
				selectionList.push_back(this);
				m_selected = true;
			}

			void ListView::Item::remove_selected(stdvec<Item*>& selectionList)
			{
				if (!STDVEC_CONTAINS(selectionList, this))
					return;
				STDVEC_REMOVE(selectionList, this);
				m_selected = false;
			}




			ListView& ListView::create(void)
			{
				setPadding({ 0, 0, 0, 0 });
				setTypeName("ogfx::gui::widgets::ListView");
				enableStopEvents();
				enableBackground();
				enableBorder();
				setBackgroundColor({ 160, 160, 160 });
				setBorderColor({ 50, 50, 50 });
				setStylesheetCategoryName("list");
				validate();
				return *this;
			}

			void ListView::applyTheme(const ostd::Stylesheet& theme)
			{
				setSeparatorLineColor(getThemeValue<Color>(theme, "separatorLineColor", getSeparatorLineColor()));
				enableShowSeparatorLine(getThemeValue<bool>(theme, "showSeparatorLine", isShowSeparatorLineEnabled()));
				setDefaultLineTextColor(getThemeValue<Color>(theme, "item.defaultTextColor", getDefaultLineTextColor()));
				setDefaultLineFontSize(getThemeValue<i32>(theme, "item.defaultFontSize", getDefaultLineFontSize()));
				setDefaultLinePadding(getThemeValue<Rectangle>(theme, "item.defaultPadding", getDefaultLinePadding()));
				setDefaultLineSelectionColor(getThemeValue<Color>(theme, "item.defaultSelectionColor", getDefaultLineSelectionColor()));
				setDefaultLineSelectionTextColor(getThemeValue<Color>(theme, "item.defaultSelectionTextColor", getDefaultLineSelectionTextColor()));
			}

			void ListView::onDraw(ogfx::BasicRenderer2D& gfx)
			{
				const auto& bounds = getGlobalBounds();
				const auto& content = getContentExtents();
				const f32 scrollY = -getScrollOffset().y;
				const f32 visibleH = getContentBounds().h;
				const f32 visibleStart = scrollY;
				const f32 visibleEnd  = scrollY + visibleH;
				Color textColor;

				f32 y = 0;
				i32 startIdx = 0;
				for (auto& item : m_list)
				{
					if (!item.isValid()) { startIdx++; continue; }
					f32 itemH = item.getDimensions().y;
					if (y + itemH > visibleStart) break;
					y += itemH;
					startIdx++;
				}

				for (i32 i = startIdx; i < (i32)m_list.size(); i++)
				{
					auto& item = m_list[i];
					if (!item.isValid()) continue;
					f32 itemH = item.getDimensions().y;
					if (y > visibleEnd) break;
					f32 lineW = content.w;
					if (content.w < bounds.w)
						lineW = bounds.w;
					if (item.isSelected())
					{
						textColor = item.getSelectedTextColor();
						gfx.fillRect({ Vec2 { bounds.x, bounds.y + y + item.getPadding().h } + getScrollOffset(), { lineW, itemH } }, item.getSelectedColor());
					}
					else
						textColor = item.getTextColor();
					gfx.drawLine({ Vec2 { bounds.x, bounds.y + y + itemH + item.getPadding().h } + getScrollOffset(), Vec2 { bounds.x + lineW, bounds.y + y + itemH + item.getPadding().h } + getScrollOffset() }, getSeparatorLineColor(), 1);
					gfx.drawString(item, bounds.getPosition() + Vec2 { 0, y } + getScrollOffset() + item.getPadding().getPosition(), textColor, item.getFontSize());
					y += itemH;
				}
			}

			void ListView::afterDraw(ogfx::BasicRenderer2D& gfx)
			{
				drawScrollbars(gfx);
			}

			void ListView::onMouseReleased(const Event& event)
			{
				if (event.mouse->button != ogfx::MouseEventData::eButton::Left)
					return;
				if (isMouseInsideAnyScrollbar())
					return;

				const Vec2  mousePos   { event.mouse->position_x, event.mouse->position_y };
				const Vec2  origin     = getGlobalBounds().getPosition();
				const Vec2  scroll     = getScrollOffset();
				const f32   localY     = mousePos.y - origin.y - scroll.y;

				f32 y = 0;
				for (auto& item : m_list)
				{
					if (!item.isValid()) continue;
					const f32 itemH = item.getDimensions().y;
					if (localY >= y && localY < y + itemH)
					{
						bool wasSelected = item.isSelected();
						item.set_selected(m_selectedList);
						if (!wasSelected && callback_onSelectionChanged)
							callback_onSelectionChanged(m_selectedList);
						event.handle();
						break;
					}
					y += itemH;
				}
			}

			Rectangle ListView::getContentExtents(void) const
			{

				if (!m_extentsDirty)
					return m_cachedExtents;
				f32 maxX = 0, maxY = 0;
				for (auto& item : m_list)
				{
					if (!item.isValid()) continue;
					Vec2 size = item.getDimensions();
					maxX = std::max(maxX, size.x);
					maxY += size.y;
				}
				m_cachedExtents = { 0, 0, maxX, maxY };
				m_extentsDirty = false;
				return m_cachedExtents;
			}

			ListView::Item& ListView::getLine(const String& text)
			{
				for (auto& item : m_list)
					if (item.getText() == text)
						return item;
				return InvalidItem;
			}

			ListView::Item& ListView::getLine(u32 index)
			{
				if (index < m_list.size())
					return m_list[index];
				return InvalidItem;
			}

			ListView::Item& ListView::addLine(const String& text)
			{
				Item item { *this };
				item.setTextColor(m_defaultLinetextColor);
				item.setPadding(m_defaultLinepadding);
				item.setFontSize(m_defaultLinefontSize);
				item.setSelectedColor(m_defaultSelectionColor);
				item.setSelectedTextColor(m_defaultSelectionTextColor);
				item.setText(text);
				m_list.push_back(item);
				if (m_list.size() > 0)
					m_list[0].set_selected(m_selectedList);
				m_extentsDirty = true;
				return m_list.back();
			}

			bool ListView::removeLine(const String& text)
			{
				auto it = std::find_if(m_list.begin(), m_list.end(), [&](const Item& item) {
					return item.getText() == text;
				});
				if (it != m_list.end())
				{
					m_list.erase(it);
					return true;
				}
				return false;
			}

			bool ListView::removeLine(u32 index)
			{
				if (!hasLine(index))
					return false;
				m_list.erase(m_list.begin() + index);
				return true;
			}

			bool ListView::hasLine(const String& text)
			{
				for (auto& item : m_list)
					if (item.getText() == text)
						return true;
				return false;
			}

			bool ListView::hasLine(u32 index)
			{
				return m_list.size() > index;
			}
		}
	}
}