/*************************************************************************/
/*  texture_editor_plugin.cpp                                            */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "texture_editor_plugin.h"

#include "editor/editor_scale.h"

TextureRect *TexturePreview::get_texture_display() {
	return texture_display;
}

void TexturePreview::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_ENTER_TREE:
		case NOTIFICATION_THEME_CHANGED: {
			if (!is_inside_tree()) {
				// TODO: This is a workaround because `NOTIFICATION_THEME_CHANGED`
				// is getting called for some reason when the `TexturePreview` is
				// getting destroyed, which causes `get_theme_font()` to return `nullptr`.
				// See https://github.com/godotengine/godot/issues/50743.
				break;
			}

			if (metadata_label) {
				Ref<Font> metadata_label_font = get_theme_font(SNAME("expression"), SNAME("EditorFonts"));
				metadata_label->add_theme_font_override("font", metadata_label_font);
			}

			checkerboard->set_texture(get_theme_icon(SNAME("Checkerboard"), SNAME("EditorIcons")));
		} break;
	}
}

void TexturePreview::_update_metadata_label_text() {
	const Ref<Texture2D> texture = texture_display->get_texture();

	String format;
	if (Object::cast_to<ImageTexture>(*texture)) {
		format = Image::get_format_name(Object::cast_to<ImageTexture>(*texture)->get_format());
	} else if (Object::cast_to<CompressedTexture2D>(*texture)) {
		format = Image::get_format_name(Object::cast_to<CompressedTexture2D>(*texture)->get_format());
	} else {
		format = texture->get_class();
	}

	const Ref<Image> image = texture->get_image();
	if (image.is_valid()) {
		const int mipmaps = image->get_mipmap_count();
		// Avoid signed integer overflow that could occur with huge texture sizes by casting everything to uint64_t.
		uint64_t memory = uint64_t(image->get_width()) * uint64_t(image->get_height()) * uint64_t(Image::get_format_pixel_size(image->get_format()));
		// Handle VRAM-compressed formats that are stored with 4 bpp.
		memory >>= Image::get_format_pixel_rshift(image->get_format());

		float mipmaps_multiplier = 1.0;
		float mipmap_increase = 0.25;
		for (int i = 0; i < mipmaps; i++) {
			// Each mip adds 25% memory usage of the previous one.
			// With a complete mipmap chain, memory usage increases by ~33%.
			mipmaps_multiplier += mipmap_increase;
			mipmap_increase *= 0.25;
		}
		memory *= mipmaps_multiplier;

		if (mipmaps >= 1) {
			metadata_label->set_text(
					vformat(String::utf8("%d×%d %s\n") + TTR("%s Mipmaps") + "\n" + TTR("Memory: %s"),
							texture->get_width(),
							texture->get_height(),
							format,
							mipmaps,
							String::humanize_size(memory)));
		} else {
			// "No Mipmaps" is easier to distinguish than "0 Mipmaps",
			// especially since 0, 6, and 8 look quite close with the default code font.
			metadata_label->set_text(
					vformat(String::utf8("%d×%d %s\n") + TTR("No Mipmaps") + "\n" + TTR("Memory: %s"),
							texture->get_width(),
							texture->get_height(),
							format,
							String::humanize_size(memory)));
		}
	} else {
		metadata_label->set_text(
				vformat(String::utf8("%d×%d %s"),
						texture->get_width(),
						texture->get_height(),
						format));
	}
}

TexturePreview::TexturePreview(Ref<Texture2D> p_texture, bool p_show_metadata) {
	checkerboard = memnew(TextureRect);
	checkerboard->set_stretch_mode(TextureRect::STRETCH_TILE);
	checkerboard->set_texture_repeat(CanvasItem::TEXTURE_REPEAT_ENABLED);
	checkerboard->set_custom_minimum_size(Size2(0.0, 256.0) * EDSCALE);
	add_child(checkerboard);

	texture_display = memnew(TextureRect);
	texture_display->set_texture(p_texture);
	texture_display->set_anchors_preset(TextureRect::PRESET_WIDE);
	texture_display->set_stretch_mode(TextureRect::STRETCH_KEEP_ASPECT_CENTERED);
	texture_display->set_ignore_texture_size(true);
	add_child(texture_display);

	if (p_show_metadata) {
		metadata_label = memnew(Label);

		_update_metadata_label_text();
		p_texture->connect("changed", callable_mp(this, &TexturePreview::_update_metadata_label_text));

		// It's okay that these colors are static since the grid color is static too.
		metadata_label->add_theme_color_override("font_color", Color::named("white"));
		metadata_label->add_theme_color_override("font_color_shadow", Color::named("black"));

		metadata_label->add_theme_font_size_override("font_size", 14 * EDSCALE);
		metadata_label->add_theme_color_override("font_outline_color", Color::named("black"));
		metadata_label->add_theme_constant_override("outline_size", 8 * EDSCALE);
		metadata_label->set_h_size_flags(Control::SIZE_SHRINK_END);
		metadata_label->set_v_size_flags(Control::SIZE_SHRINK_END);

		add_child(metadata_label);
	}
}

bool EditorInspectorPluginTexture::can_handle(Object *p_object) {
	return Object::cast_to<ImageTexture>(p_object) != nullptr || Object::cast_to<AtlasTexture>(p_object) != nullptr || Object::cast_to<CompressedTexture2D>(p_object) != nullptr || Object::cast_to<AnimatedTexture>(p_object) != nullptr;
}

void EditorInspectorPluginTexture::parse_begin(Object *p_object) {
	Ref<Texture> texture(Object::cast_to<Texture>(p_object));

	add_custom_control(memnew(TexturePreview(texture, true)));
}

TextureEditorPlugin::TextureEditorPlugin() {
	Ref<EditorInspectorPluginTexture> plugin;
	plugin.instantiate();
	add_inspector_plugin(plugin);
}