/*************************************************************************/
/*  spatial_editor_gizmos.cpp                                            */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "spatial_editor_gizmos.h"

#include "scene/resources/surface_tool.h"

ModuleSkeletonSpatialGizmoPlugin::ModuleSkeletonSpatialGizmoPlugin() {

	skeleton_color = EDITOR_DEF("editors/3d_gizmos/gizmo_colors/skeleton", Color(1, 0.8, 0.4));
	selected_bone_color = EDITOR_DEF("editors/3d_gizmos/gizmo_colors/selected_bone", Color(1, 0, 0));
	bone_axis_length = EDITOR_DEF("editors/3d_gizmos/gizmo_settings/bone_axis_length", (float)0.015);
	create_material("skeleton_material", skeleton_color);
	selected_mat = Ref<ShaderMaterial>(memnew(ShaderMaterial));
	selected_sh = Ref<Shader>(memnew(Shader));
	selected_sh->set_code(" \
					shader_type spatial; \
					render_mode unshaded; \
					uniform vec4 albedo : hint_color = vec4(1,1,1,1); \
					uniform sampler2D texture_albedo : hint_albedo; \
					uniform float point_size : hint_range(0,128) = 32; \
					void vertex() { \
						if (!OUTPUT_IS_SRGB) { \
							COLOR.rgb = mix( pow((COLOR.rgb + vec3(0.055)) * (1.0 / (1.0 + 0.055)), vec3(2.4)), COLOR.rgb* (1.0 / 12.92), lessThan(COLOR.rgb,vec3(0.04045)) ); \
						} \
						VERTEX = VERTEX; \
						POSITION=PROJECTION_MATRIX*INV_CAMERA_MATRIX*WORLD_MATRIX*vec4(VERTEX.xyz,1.0); \
						POSITION.z = mix(POSITION.z, -POSITION.w, 0.998); \
					} \
					void fragment() { \
						vec2 base_uv = UV; \
						vec4 albedo_tex = texture(texture_albedo,base_uv); \
						albedo_tex *= COLOR; \
						if (albedo.a * albedo_tex.a < 0.5) { discard; } \
						ALBEDO = albedo.rgb * albedo_tex.rgb; \
					} \
				");
	selected_mat->set_shader(selected_sh);
}

bool ModuleSkeletonSpatialGizmoPlugin::has_gizmo(Spatial *p_spatial) {
	return Object::cast_to<Skeleton>(p_spatial) != NULL;
}

String ModuleSkeletonSpatialGizmoPlugin::get_name() const {
	return "Skeleton";
}

int ModuleSkeletonSpatialGizmoPlugin::get_priority() const {
	return -1;
}

void ModuleSkeletonSpatialGizmoPlugin::redraw(EditorSpatialGizmo *p_gizmo) {

	Skeleton *skel = Object::cast_to<Skeleton>(p_gizmo->get_spatial_node());

	p_gizmo->clear();

	Ref<Material> material;
	if (p_gizmo->is_selected()) {
		material = selected_mat;
	} else {
		material = get_material("skeleton_material", p_gizmo);
	}

	Ref<SurfaceTool> surface_tool(memnew(SurfaceTool));

	surface_tool->begin(Mesh::PRIMITIVE_LINES);
	surface_tool->set_material(material);
	Vector<Transform> grests;
	grests.resize(skel->get_bone_count());

	Vector<int> bones;
	Vector<float> weights;
	bones.resize(4);
	weights.resize(4);

	for (int i = 0; i < 4; i++) {
		bones.write[i] = 0;
		weights.write[i] = 0;
	}

	weights.write[0] = 1;

	Color bone_color;
	AABB aabb;

	for (int i_bone = 0; i_bone < skel->get_bone_count(); i_bone++) {
		int i = skel->get_process_order(i_bone);

		if (skel->get_bone_parent(i) == skel->get_selected_bone()) {
			bone_color = selected_bone_color;
		} else {
			bone_color = skeleton_color;
		}

		int parent = skel->get_bone_parent(i);

		if (parent >= 0) {
			grests.write[i] = grests[parent] * skel->get_bone_rest(i);

			Vector3 v0 = grests[parent].origin;
			Vector3 v1 = grests[i].origin;
			Vector3 d = (v1 - v0).normalized();
			float dist = v0.distance_to(v1);

			//find closest axis
			int closest = -1;
			float closest_d = 0.0;

			for (int j = 0; j < 3; j++) {
				float dp = Math::abs(grests[parent].basis[j].normalized().dot(d));
				if (j == 0 || dp > closest_d)
					closest = j;
			}

			//find closest other
			Vector3 first;
			Vector3 points[4];
			int pointidx = 0;
			Color axis_color[3];
			axis_color[0] = Color(1,0,0);
			axis_color[1] = Color(0,1,0);
			axis_color[2] = Color(0,0,1);
			for (int j = 0; j < 3; j++) {

				if (p_gizmo->is_selected()) {
					bones.write[0] = i;
					surface_tool->add_bones(bones);
					surface_tool->add_weights(weights);
					surface_tool->add_color(axis_color[j]);
					surface_tool->add_vertex(v1);
					surface_tool->add_bones(bones);
					surface_tool->add_weights(weights);
					surface_tool->add_color(axis_color[j]);
					surface_tool->add_vertex(v1 + (grests[i].basis.inverse())[j].normalized() * bone_axis_length);
				} else {
					bones.write[0] = i;
					surface_tool->add_bones(bones);
					surface_tool->add_weights(weights);
					surface_tool->add_color(axis_color[j]);
					surface_tool->add_vertex(v1 - (grests[i].basis.inverse())[j].normalized() * bone_axis_length * 0.5);
					surface_tool->add_bones(bones);
					surface_tool->add_weights(weights);
					surface_tool->add_color(axis_color[j]);
					surface_tool->add_vertex(v1 + (grests[i].basis.inverse())[j].normalized() * bone_axis_length * 0.5);
				}

				if (j == closest)
					continue;

				Vector3 axis;
				if (first == Vector3()) {
					axis = d.cross(d.cross(grests[parent].basis[j])).normalized();
					first = axis;
				} else {
					axis = d.cross(first).normalized();
				}

				for (int k = 0; k < 2; k++) {

					if (k == 1)
						axis = -axis;
					Vector3 point = v0 + d * dist * 0.2;
					point += axis * dist * 0.1;

					bones.write[0] = parent;
					surface_tool->add_bones(bones);
					surface_tool->add_weights(weights);
					surface_tool->add_color(bone_color);
					surface_tool->add_vertex(v0);
					surface_tool->add_bones(bones);
					surface_tool->add_weights(weights);
					surface_tool->add_color(bone_color);
					surface_tool->add_vertex(point);

					bones.write[0] = parent;
					surface_tool->add_bones(bones);
					surface_tool->add_weights(weights);
					surface_tool->add_color(bone_color);
					surface_tool->add_vertex(point);
					bones.write[0] = i;
					surface_tool->add_bones(bones);
					surface_tool->add_weights(weights);
					surface_tool->add_color(bone_color);
					surface_tool->add_vertex(v1);
					points[pointidx++] = point;
				}
			}

			SWAP(points[1], points[2]);
			for (int j = 0; j < 4; j++) {

				bones.write[0] = parent;
				surface_tool->add_bones(bones);
				surface_tool->add_weights(weights);
				surface_tool->add_color(bone_color);
				surface_tool->add_vertex(points[j]);
				surface_tool->add_bones(bones);
				surface_tool->add_weights(weights);
				surface_tool->add_color(bone_color);
				surface_tool->add_vertex(points[(j + 1) % 4]);
			}

			/*
			bones[0]=parent;
			surface_tool->add_bones(bones);
			surface_tool->add_weights(weights);
			surface_tool->add_color(Color(0.4,1,0.4,0.4));
			surface_tool->add_vertex(v0);
			bones[0]=i;
			surface_tool->add_bones(bones);
			surface_tool->add_weights(weights);
			surface_tool->add_color(Color(0.4,1,0.4,0.4));
			surface_tool->add_vertex(v1);
*/
		} else {

			grests.write[i] = skel->get_bone_rest(i);
			bones.write[0] = i;

			Vector3 v1 = grests[i].origin;
			Color axis_color[3];
			axis_color[0] = Color(1,0,0);
			axis_color[1] = Color(0,1,0);
			axis_color[2] = Color(0,0,1);
			for (int j = 0; j < 3; j++) {

				if (p_gizmo->is_selected()) {
					bones.write[0] = i;
					surface_tool->add_bones(bones);
					surface_tool->add_weights(weights);
					surface_tool->add_color(axis_color[j]);
					surface_tool->add_vertex(v1);
					surface_tool->add_bones(bones);
					surface_tool->add_weights(weights);
					surface_tool->add_color(axis_color[j]);
					surface_tool->add_vertex(v1 + (grests[i].basis.inverse())[j].normalized() * bone_axis_length);
				} else {
					bones.write[0] = i;
					surface_tool->add_bones(bones);
					surface_tool->add_weights(weights);
					surface_tool->add_color(axis_color[j]);
					surface_tool->add_vertex(v1 - (grests[i].basis.inverse())[j].normalized() * bone_axis_length * 0.5);
					surface_tool->add_bones(bones);
					surface_tool->add_weights(weights);
					surface_tool->add_color(axis_color[j]);
					surface_tool->add_vertex(v1 + (grests[i].basis.inverse())[j].normalized() * bone_axis_length * 0.5);
				}
			}

		}
		/*
		Transform  t = grests[i];
		t.orthonormalize();

		for (int i=0;i<6;i++) {


			Vector3 face_points[4];

			for (int j=0;j<4;j++) {

				float v[3];
				v[0]=1.0;
				v[1]=1-2*((j>>1)&1);
				v[2]=v[1]*(1-2*(j&1));

				for (int k=0;k<3;k++) {

					if (i<3)
						face_points[j][(i+k)%3]=v[k]*(i>=3?-1:1);
					else
						face_points[3-j][(i+k)%3]=v[k]*(i>=3?-1:1);
				}
			}

			for(int j=0;j<4;j++) {
				surface_tool->add_bones(bones);
				surface_tool->add_weights(weights);
				surface_tool->add_color(Color(1.0,0.4,0.4,0.4));
				surface_tool->add_vertex(t.xform(face_points[j]*0.04));
				surface_tool->add_bones(bones);
				surface_tool->add_weights(weights);
				surface_tool->add_color(Color(1.0,0.4,0.4,0.4));
				surface_tool->add_vertex(t.xform(face_points[(j+1)%4]*0.04));
			}

		}
		*/
	}

	Ref<ArrayMesh> m = surface_tool->commit();
	p_gizmo->add_mesh(m, false, skel->register_skin(Ref<Skin>()));
}