///
module nanogui.theme;

/*
	NanoGUI was developed by Wenzel Jakob <wenzel.jakob@epfl.ch>.
	The widget drawing code is based on the NanoVG demo application
	by Mikko Mononen.

	All rights reserved. Use of this source code is governed by a
	BSD-style license that can be found in the LICENSE.txt file.
*/

import nanogui.common : NVGContext, Color;
import nanogui.entypo;

/**
 * Storage class for basic theme-related properties.
 */
class Theme
{
public:
	this(NVGContext nvg)
	{
		mStandardFontSize                 = 16;
		mButtonFontSize                   = 20;
		mTextBoxFontSize                  = 20;
		mIconScale                        = 0.77f;

		mWindowCornerRadius               = 2;
		mWindowHeaderHeight               = 30;
		mWindowDropShadowSize             = 10;
		mButtonCornerRadius               = 2;
		mTabBorderWidth                   = 0.75f;
		mTabInnerMargin                   = 5;
		mTabMinButtonWidth                = 20;
		mTabMaxButtonWidth                = 160;
		mTabControlWidth                  = 20;
		mTabButtonHorizontalPadding       = 10;
		mTabButtonVerticalPadding         = 2;

		mDropShadow                       = Color(0, 0, 0, 128);
		mTransparent                      = Color(0, 0, 0, 0);
		mBorderDark                       = Color(29, 29, 29, 255);
		mBorderLight                      = Color(92, 92, 92, 255);
		mBorderMedium                     = Color(35, 35, 35, 255);
		mTextColor                        = Color(255, 255, 255, 160);
		mDisabledTextColor                = Color(255, 255, 255, 80);
		mTextColorShadow                  = Color(0, 0, 0, 160);
		mIconColor                        = mTextColor;

		mButtonGradientTopFocused         = Color(64, 64, 64, 255);
		mButtonGradientBotFocused         = Color(48, 48, 48, 255);
		mButtonGradientTopUnfocused       = Color(74, 74, 74, 255);
		mButtonGradientBotUnfocused       = Color(58, 58, 58, 255);
		mButtonGradientTopPushed          = Color(41, 41, 41, 255);
		mButtonGradientBotPushed          = Color(29, 29, 29, 255);

		/* Window-related */
		mWindowFillUnfocused              = Color(43, 43, 43, 230);
		mWindowFillFocused                = Color(45, 45, 45, 230);
		mWindowTitleUnfocused             = Color(220, 220, 220, 160);
		mWindowTitleFocused               = Color(255, 255, 255, 190);

		mWindowHeaderGradientTop          = mButtonGradientTopUnfocused;
		mWindowHeaderGradientBot          = mButtonGradientBotUnfocused;
		mWindowHeaderSepTop               = mBorderLight;
		mWindowHeaderSepBot               = mBorderDark;

		mWindowPopup                      = Color(50, 50, 50, 255);
		mWindowPopupTransparent           = Color(50, 50, 50, 0);

		mCheckBoxIcon                     = Entypo.ICON_CHECK;
		mMessageInformationIcon           = Entypo.ICON_INFO_WITH_CIRCLE;
		mMessageQuestionIcon              = Entypo.ICON_HELP_WITH_CIRCLE;
		mMessageWarningIcon               = Entypo.ICON_WARNING;
		mMessageAltButtonIcon             = Entypo.ICON_CIRCLE_WITH_CROSS;
		mMessagePrimaryButtonIcon         = Entypo.ICON_CHECK;
		mPopupChevronRightIcon            = Entypo.ICON_CHEVRON_RIGHT;
		mPopupChevronLeftIcon             = Entypo.ICON_CHEVRON_LEFT;
		mTabHeaderLeftIcon                = Entypo.ICON_ARROW_BOLD_LEFT;
		mTabHeaderRightIcon               = Entypo.ICON_ARROW_BOLD_RIGHT;
		mTextBoxUpIcon                    = Entypo.ICON_CHEVRON_UP;
		mTextBoxDownIcon                  = Entypo.ICON_CHEVRON_DOWN;

		import arsd.nanovega : createFontMem;
		import nanogui.resources;
		mFontNormal = nvg.createFontMem("sans", roboto_regular_ttf.ptr,
									   cast(int) roboto_regular_ttf.length, 0);
		mFontBold = nvg.createFontMem("sans-bold", roboto_bold_ttf.ptr,
									 cast(int) roboto_bold_ttf.length, 0);
		mFontIcons = nvg.createFontMem("icons", entypo_ttf.ptr,
									  cast(int) entypo_ttf.length, 0);
		if (mFontNormal == -1 || mFontBold == -1 || mFontIcons == -1)
		{
			throw new Exception("Could not load fonts!");
		}
	}

	/* Fonts */
	/// The standard font face (default: `"sans"` from `resources/roboto_regular.ttf`).
	int mFontNormal;
	/// The bold font face (default: `"sans-bold"` from `resources/roboto_regular.ttf`).
	int mFontBold;
	/// The icon font face (default: `"icons"` from `resources/entypo.ttf`).
	int mFontIcons;
	/**
	 * The amount of scaling that is applied to each icon to fit the size of
	 * NanoGUI widgets.  The default value is `0.77f`, setting to e.g. higher
	 * than `1.0f` is generally discouraged.
	 */
	float mIconScale;

	/* Spacing-related parameters */
	/// The font size for all widgets other than buttons and textboxes (default: ` 16`).
	int mStandardFontSize;
	/// The font size for buttons (default: `20`).
	int mButtonFontSize;
	/// The font size for text boxes (default: `20`).
	int mTextBoxFontSize;
	/// Rounding radius for Window widget corners (default: `2`).
	int mWindowCornerRadius;
	/// Default size of Window widget titles (default: `30`).
	int mWindowHeaderHeight;
	/// Size of drop shadow rendered behind the Window widgets (default: `10`).
	int mWindowDropShadowSize;
	/// Rounding radius for Button (and derived types) widgets (default: `2`).
	int mButtonCornerRadius;
	/// The border width for TabHeader widgets (default: `0.75f`).
	float mTabBorderWidth;
	/// The inner margin on a TabHeader widget (default: `5`).
	int mTabInnerMargin;
	/// The minimum size for buttons on a TabHeader widget (default: `20`).
	int mTabMinButtonWidth;
	/// The maximum size for buttons on a TabHeader widget (default: `160`).
	int mTabMaxButtonWidth;
	/// Used to help specify what lies "in bound" for a TabHeader widget (default: `20`).
	int mTabControlWidth;
	/// The amount of horizontal padding for a TabHeader widget (default: `10`).
	int mTabButtonHorizontalPadding;
	/// The amount of vertical padding for a TabHeader widget (default: `2`).
	int mTabButtonVerticalPadding;

	/* Generic colors */
	/**
	 * The color of the drop shadow drawn behind widgets
	 * (default: intensity=`0`, alpha=`128`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mDropShadow;
	/**
	 * The transparency color
	 * (default: intensity=`0`, alpha=`0`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mTransparent;
	/**
	 * The dark border color
	 * (default: intensity=`29`, alpha=`255`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mBorderDark;
	/**
	 * The light border color
	 * (default: intensity=`92`, alpha=`255`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mBorderLight;
	/**
	 * The medium border color
	 * (default: intensity=`35`, alpha=`255`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mBorderMedium;
	/**
	 * The text color
	 * (default: intensity=`255`, alpha=`160`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mTextColor;
	/**
	 * The disable dtext color
	 * (default: intensity=`255`, alpha=`80`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mDisabledTextColor;
	/**
	 * The text shadow color
	 * (default: intensity=`0`, alpha=`160`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mTextColorShadow;
	/// The icon color (default: \ref nanogui::Theme::mTextColor).
	Color mIconColor;

	/* Button colors */
	/**
	 * The top gradient color for buttons in focus
	 * (default: intensity=`64`, alpha=`255`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mButtonGradientTopFocused;
	/**
	 * The bottom gradient color for buttons in focus
	 * (default: intensity=`48`, alpha=`255`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mButtonGradientBotFocused;
	/**
	 * The top gradient color for buttons not in focus
	 * (default: intensity=`74`, alpha=`255`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mButtonGradientTopUnfocused;
	/**
	 * The bottom gradient color for buttons not in focus
	 * (default: intensity=`58`, alpha=`255`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mButtonGradientBotUnfocused;
	/**
	 * The top gradient color for buttons currently pushed
	 * (default: intensity=`41`, alpha=`255`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mButtonGradientTopPushed;
	/**
	 * The bottom gradient color for buttons currently pushed
	 * (default: intensity=`29`, alpha=`255`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mButtonGradientBotPushed;

	/* Window colors */
	/**
	 * The fill color for a Window that is not in focus
	 * (default: intensity=`43`, alpha=`230`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mWindowFillUnfocused;
	/**
	 * The fill color for a Window that is in focus
	 * (default: intensity=`45`, alpha=`230`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mWindowFillFocused;
	/**
	 * The title color for a Window that is not in focus
	 * (default: intensity=`220`, alpha=`160`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mWindowTitleUnfocused;
	/**
	 * The title color for a Window that is in focus
	 * (default: intensity=`255`, alpha=`190`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mWindowTitleFocused;

	/**
	 * The top gradient color for Window headings
	 * (default: \ref nanogui::Theme::mButtonGradientTopUnfocused).
	 */
	Color mWindowHeaderGradientTop;
	/**
	 * The bottom gradient color for Window headings
	 * (default: \ref nanogui::Theme::mButtonGradientBotUnfocused).
	 */
	Color mWindowHeaderGradientBot;
	/// The Window header top separation color (default: `nanogui.Theme.mBorderLight`).
	Color mWindowHeaderSepTop;
	/// The Window header bottom separation color (default: `nanogui.Theme.mBorderDark`).
	Color mWindowHeaderSepBot;

	/**
	 * The popup window color
	 * (default: intensity=`50`, alpha=`255`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mWindowPopup;
	/**
	 * The transparent popup window color
	 * (default: intensity=`50`, alpha=`0`; see `nanogui.Color.Color(int,int)`).
	 */
	Color mWindowPopupTransparent;

	/// Icon to use for CheckBox widgets (default: `Entypo.ICON_CHECK`).
	dchar mCheckBoxIcon;
	/// Icon to use for informational MessageDialog widgets (default: `Entypo.ICON_INFO_WITH_CIRCLE`).
	dchar mMessageInformationIcon;
	/// Icon to use for interrogative MessageDialog widgets (default: `Entypo.ICON_HELP_WITH_CIRCLE`).
	dchar mMessageQuestionIcon;
	/// Icon to use for warning MessageDialog widgets (default: `Entypo.ICON_WARNING`).
	dchar mMessageWarningIcon;
	/// Icon to use on MessageDialog alt button (default: `Entypo.ICON_CIRCLE_WITH_CROSS`).
	dchar mMessageAltButtonIcon;
	/// Icon to use on MessageDialog primary button (default: `Entypo.ICON_CHECK`).
	dchar mMessagePrimaryButtonIcon;
	/// Icon to use for PopupButton widgets opening to the right (default: `Entypo.ICON_CHEVRON_RIGHT`).
	dchar mPopupChevronRightIcon;
	/// Icon to use for PopupButton widgets opening to the left (default: `Entypo.ICON_CHEVRON_LEFT`).
	dchar mPopupChevronLeftIcon;
	/// Icon to indicate hidden tabs to the left on a TabHeader (default: `Entypo.ICON_ARROW_BOLD_LEFT`).
	dchar mTabHeaderLeftIcon;
	/// Icon to indicate hidden tabs to the right on a TabHeader (default: `Entypo.ICON_ARROW_BOLD_RIGHT`).
	dchar mTabHeaderRightIcon;
	/// Icon to use when a TextBox has an up toggle (e.g. IntBox) (default: `Entypo.ICON_CHEVRON_UP`).
	dchar mTextBoxUpIcon;
	/// Icon to use when a TextBox has a down toggle (e.g. IntBox) (default: `Entypo.ICON_CHEVRON_DOWN`).
	dchar mTextBoxDownIcon;

protected:
	/// Default destructor does nothing; allows for inheritance.
	~this() { }
}