/*************************************************************************/
/*  material_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 "material_editor_plugin.h"

#include "editor/editor_scale.h"
#include "scene/gui/texture_button.h"
#include "scene/gui/viewport_container.h"
#include "scene/main/viewport.h"
#include "scene/resources/environment_3d.h"
#include "scene/resources/material/particles_material.h"
#include "scene/resources/material/spatial_material.h"
#include "scene/resources/material/shader_material.h"
#include "scene/resources/sky.h"
#include "scene/resources/world_3d.h"
#include "core/object/class_db.h"
#include "core/math/color.h"
#include "core/error/error_macros.h"
#include "core/containers/list.h"
#include "core/math/basis.h"
#include "core/math/math_funcs.h"
#include "core/math/rect2.h"
#include "core/math/transform.h"
#include "core/math/vector2.h"
#include "core/math/vector3.h"
#include "core/os/memory.h"
#include "core/object/resource.h"
#include "core/variant/variant.h"
#include "editor/editor_settings.h"
#include "scene/main/canvas_item.h"
#include "scene/3d/camera.h"
#include "scene/3d/light.h"
#include "scene/3d/mesh_instance.h"
#include "scene/gui/box_container.h"
#include "scene/main/node.h"
#include "scene/resources/mesh/mesh.h"
#include "scene/resources/shader.h"
#include "scene/resources/texture.h"
#include "servers/rendering_server.h"

class EditorNode;

void MaterialEditor::_gui_input(const Ref<InputEvent> &p_event) {
	ERR_FAIL_COND(p_event.is_null());

	Ref<InputEventMouseMotion> mm = p_event;
	if (mm.is_valid() && (mm->get_button_mask() & BUTTON_MASK_LEFT)) {
		rot.x -= mm->get_relative().y * 0.01;
		rot.y -= mm->get_relative().x * 0.01;

		rot.x = CLAMP(rot.x, -Math_PI / 2, Math_PI / 2);
		_update_rotation();
	}
}

void MaterialEditor::_notification(int p_what) {
	if (p_what == NOTIFICATION_READY) {
		//get_scene()->connect("node_removed",this,"_node_removed");

		if (first_enter) {
			//it's in propertyeditor so.. could be moved around

			light_1_switch->set_normal_texture(get_theme_icon("MaterialPreviewLight1", "EditorIcons"));
			light_1_switch->set_pressed_texture(get_theme_icon("MaterialPreviewLight1Off", "EditorIcons"));
			light_2_switch->set_normal_texture(get_theme_icon("MaterialPreviewLight2", "EditorIcons"));
			light_2_switch->set_pressed_texture(get_theme_icon("MaterialPreviewLight2Off", "EditorIcons"));

			sphere_switch->set_normal_texture(get_theme_icon("MaterialPreviewSphereOff", "EditorIcons"));
			sphere_switch->set_pressed_texture(get_theme_icon("MaterialPreviewSphere", "EditorIcons"));
			box_switch->set_normal_texture(get_theme_icon("MaterialPreviewCubeOff", "EditorIcons"));
			box_switch->set_pressed_texture(get_theme_icon("MaterialPreviewCube", "EditorIcons"));

			first_enter = false;
		}
	}

	if (p_what == NOTIFICATION_DRAW) {
		Ref<Texture> checkerboard = get_theme_icon("Checkerboard", "EditorIcons");
		Size2 size = get_size();

		draw_texture_rect(checkerboard, Rect2(Point2(), size), true);
	}
}

void MaterialEditor::_update_rotation() {
	Transform t;
	t.basis.rotate(Vector3(0, 1, 0), -rot.y);
	t.basis.rotate(Vector3(1, 0, 0), -rot.x);
	rotation->set_transform(t);
}

void MaterialEditor::edit(Ref<Material> p_material, const Ref<Environment3D> &p_env) {
	material = p_material;
	camera->set_environment(p_env);
	if (!material.is_null()) {
		sphere_instance->set_material_override(material);
		box_instance->set_material_override(material);
	} else {
		hide();
	}

	rot.x = Math::deg2rad(-15.0);
	rot.y = Math::deg2rad(30.0);
	_update_rotation();
}

void MaterialEditor::_button_pressed(Node *p_button) {
	if (p_button == light_1_switch) {
		light1->set_visible(!light_1_switch->is_pressed());
	}

	if (p_button == light_2_switch) {
		light2->set_visible(!light_2_switch->is_pressed());
	}

	if (p_button == box_switch) {
		box_instance->show();
		sphere_instance->hide();
		box_switch->set_pressed(true);
		sphere_switch->set_pressed(false);
		EditorSettings::get_singleton()->set_project_metadata("inspector_options", "material_preview_on_sphere", false);
	}

	if (p_button == sphere_switch) {
		box_instance->hide();
		sphere_instance->show();
		box_switch->set_pressed(false);
		sphere_switch->set_pressed(true);
		EditorSettings::get_singleton()->set_project_metadata("inspector_options", "material_preview_on_sphere", true);
	}
}

void MaterialEditor::_bind_methods() {
	ClassDB::bind_method(D_METHOD("_gui_input"), &MaterialEditor::_gui_input);
	ClassDB::bind_method(D_METHOD("_button_pressed"), &MaterialEditor::_button_pressed);
}

MaterialEditor::MaterialEditor() {
	vc = memnew(ViewportContainer);
	vc->set_stretch(true);
	add_child(vc);
	vc->set_anchors_and_margins_preset(PRESET_WIDE);
	viewport = memnew(Viewport);
	Ref<World3D> world;
	world.instance();
	viewport->set_world_3d(world); //use own world
	vc->add_child(viewport);
	viewport->set_disable_input(true);
	viewport->set_transparent_background(true);
	viewport->set_msaa(Viewport::MSAA_4X);

	camera = memnew(Camera);
	camera->set_transform(Transform(Basis(), Vector3(0, 0, 1.1)));
	camera->set_perspective(45, 0.1, 10);
	camera->make_current();
	viewport->add_child(camera);

	light1 = memnew(DirectionalLight);
	light1->set_transform(Transform().looking_at(Vector3(-1, -1, -1), Vector3(0, 1, 0)));
	viewport->add_child(light1);

	light2 = memnew(DirectionalLight);
	light2->set_transform(Transform().looking_at(Vector3(0, 1, 0), Vector3(0, 0, 1)));
	light2->set_color(Color(0.7, 0.7, 0.7));
	viewport->add_child(light2);

	rotation = memnew(Spatial);
	viewport->add_child(rotation);

	sphere_instance = memnew(MeshInstance);
	rotation->add_child(sphere_instance);

	box_instance = memnew(MeshInstance);
	rotation->add_child(box_instance);

	box_instance->set_transform(Transform(Basis() * 0.25, Vector3() * 0.25));
	sphere_instance->set_transform(Transform(Basis() * 0.375, Vector3() * 0.375));

	sphere_mesh.instance();
	sphere_instance->set_mesh(sphere_mesh);
	box_mesh.instance();
	box_instance->set_mesh(box_mesh);

	set_custom_minimum_size(Size2(1, 150) * EDSCALE);

	HBoxContainer *hb = memnew(HBoxContainer);
	add_child(hb);
	hb->set_anchors_and_margins_preset(Control::PRESET_WIDE, Control::PRESET_MODE_MINSIZE, 2);

	VBoxContainer *vb_shape = memnew(VBoxContainer);
	hb->add_child(vb_shape);

	sphere_switch = memnew(TextureButton);
	sphere_switch->set_toggle_mode(true);
	sphere_switch->set_pressed(true);
	vb_shape->add_child(sphere_switch);
	sphere_switch->connect("pressed", this, "_button_pressed", varray(sphere_switch));

	box_switch = memnew(TextureButton);
	box_switch->set_toggle_mode(true);
	box_switch->set_pressed(false);
	vb_shape->add_child(box_switch);
	box_switch->connect("pressed", this, "_button_pressed", varray(box_switch));

	hb->add_spacer();

	VBoxContainer *vb_light = memnew(VBoxContainer);
	hb->add_child(vb_light);

	light_1_switch = memnew(TextureButton);
	light_1_switch->set_toggle_mode(true);
	vb_light->add_child(light_1_switch);
	light_1_switch->connect("pressed", this, "_button_pressed", varray(light_1_switch));

	light_2_switch = memnew(TextureButton);
	light_2_switch->set_toggle_mode(true);
	vb_light->add_child(light_2_switch);
	light_2_switch->connect("pressed", this, "_button_pressed", varray(light_2_switch));

	first_enter = true;

	if (EditorSettings::get_singleton()->get_project_metadata("inspector_options", "material_preview_on_sphere", true)) {
		box_instance->hide();
	} else {
		box_instance->show();
		sphere_instance->hide();
		box_switch->set_pressed(true);
		sphere_switch->set_pressed(false);
	}
}

MaterialEditor::~MaterialEditor() {

}

///////////////////////

bool EditorInspectorPluginMaterial::can_handle(Object *p_object) {
	Material *material = Object::cast_to<Material>(p_object);
	if (!material) {
		return false;
	}

	return material->get_shader_mode() == Shader::MODE_SPATIAL;
}

void EditorInspectorPluginMaterial::parse_begin(Object *p_object) {
	Material *material = Object::cast_to<Material>(p_object);
	if (!material) {
		return;
	}
	Ref<Material> m(material);

	MaterialEditor *editor = memnew(MaterialEditor);
	editor->edit(m, env);
	add_custom_control(editor);
}

EditorInspectorPluginMaterial::EditorInspectorPluginMaterial() {
	env.instance();
	Ref<ProceduralSky> proc_sky = memnew(ProceduralSky(true));
	env->set_sky(proc_sky);
	env->set_background(Environment3D::BG_COLOR_SKY);
}

MaterialEditorPlugin::MaterialEditorPlugin(EditorNode *p_node) {
	Ref<EditorInspectorPluginMaterial> plugin;
	plugin.instance();
	add_inspector_plugin(plugin);
}

String SpatialMaterialConversionPlugin::converts_to() const {
	return "ShaderMaterial";
}
bool SpatialMaterialConversionPlugin::handles(const Ref<Resource> &p_resource) const {
	Ref<SpatialMaterial> mat = p_resource;
	return mat.is_valid();
}
Ref<Resource> SpatialMaterialConversionPlugin::convert(const Ref<Resource> &p_resource) const {
	Ref<SpatialMaterial> mat = p_resource;
	ERR_FAIL_COND_V(!mat.is_valid(), Ref<Resource>());

	Ref<ShaderMaterial> smat;
	smat.instance();

	Ref<Shader> shader;
	shader.instance();

	String code = RS::get_singleton()->shader_get_code(mat->get_shader_rid());

	shader->set_code(code);

	smat->set_shader(shader);

	List<PropertyInfo> params;
	RS::get_singleton()->shader_get_param_list(mat->get_shader_rid(), &params);

	for (List<PropertyInfo>::Element *E = params.front(); E; E = E->next()) {
		// Texture parameter has to be treated specially since SpatialMaterial saved it
		// as RID but ShaderMaterial needs Texture itself
		Ref<Texture> texture = mat->get_texture_by_name(E->get().name);
		if (texture.is_valid()) {
			smat->set_shader_param(E->get().name, texture);
		} else {
			Variant value = RS::get_singleton()->material_get_param(mat->get_rid(), E->get().name);
			smat->set_shader_param(E->get().name, value);
		}
	}

	smat->set_render_priority(mat->get_render_priority());
	smat->set_local_to_scene(mat->is_local_to_scene());
	smat->set_name(mat->get_name());
	return smat;
}

String ParticlesMaterialConversionPlugin::converts_to() const {
	return "ShaderMaterial";
}
bool ParticlesMaterialConversionPlugin::handles(const Ref<Resource> &p_resource) const {
	Ref<ParticlesMaterial> mat = p_resource;
	return mat.is_valid();
}
Ref<Resource> ParticlesMaterialConversionPlugin::convert(const Ref<Resource> &p_resource) const {
	Ref<ParticlesMaterial> mat = p_resource;
	ERR_FAIL_COND_V(!mat.is_valid(), Ref<Resource>());

	Ref<ShaderMaterial> smat;
	smat.instance();

	Ref<Shader> shader;
	shader.instance();

	String code = RS::get_singleton()->shader_get_code(mat->get_shader_rid());

	shader->set_code(code);

	smat->set_shader(shader);

	List<PropertyInfo> params;
	RS::get_singleton()->shader_get_param_list(mat->get_shader_rid(), &params);

	for (List<PropertyInfo>::Element *E = params.front(); E; E = E->next()) {
		Variant value = RS::get_singleton()->material_get_param(mat->get_rid(), E->get().name);
		smat->set_shader_param(E->get().name, value);
	}

	smat->set_render_priority(mat->get_render_priority());
	smat->set_local_to_scene(mat->is_local_to_scene());
	smat->set_name(mat->get_name());
	return smat;
}

String CanvasItemMaterialConversionPlugin::converts_to() const {
	return "ShaderMaterial";
}
bool CanvasItemMaterialConversionPlugin::handles(const Ref<Resource> &p_resource) const {
	Ref<CanvasItemMaterial> mat = p_resource;
	return mat.is_valid();
}
Ref<Resource> CanvasItemMaterialConversionPlugin::convert(const Ref<Resource> &p_resource) const {
	Ref<CanvasItemMaterial> mat = p_resource;
	ERR_FAIL_COND_V(!mat.is_valid(), Ref<Resource>());

	Ref<ShaderMaterial> smat;
	smat.instance();

	Ref<Shader> shader;
	shader.instance();

	String code = RS::get_singleton()->shader_get_code(mat->get_shader_rid());

	shader->set_code(code);

	smat->set_shader(shader);

	List<PropertyInfo> params;
	RS::get_singleton()->shader_get_param_list(mat->get_shader_rid(), &params);

	for (List<PropertyInfo>::Element *E = params.front(); E; E = E->next()) {
		Variant value = RS::get_singleton()->material_get_param(mat->get_rid(), E->get().name);
		smat->set_shader_param(E->get().name, value);
	}

	smat->set_render_priority(mat->get_render_priority());
	smat->set_local_to_scene(mat->is_local_to_scene());
	smat->set_name(mat->get_name());
	return smat;
}