/*************************************************************************/
/*  line_2d.cpp                                                          */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#include "line_2d.h"

#include "core/core_string_names.h"
#include "core/math/geometry_2d.h"
#include "line_builder.h"

// Needed so we can bind functions
VARIANT_ENUM_CAST(Line2D::LineJointMode)
VARIANT_ENUM_CAST(Line2D::LineCapMode)
VARIANT_ENUM_CAST(Line2D::LineTextureMode)

Line2D::Line2D() {
}

#ifdef TOOLS_ENABLED
Rect2 Line2D::_edit_get_rect() const {
	if (_points.size() == 0) {
		return Rect2(0, 0, 0, 0);
	}
	Vector2 d = Vector2(_width, _width);
	Rect2 aabb = Rect2(_points[0] - d, 2 * d);
	for (int i = 1; i < _points.size(); i++) {
		aabb.expand_to(_points[i] - d);
		aabb.expand_to(_points[i] + d);
	}
	return aabb;
}

bool Line2D::_edit_use_rect() const {
	return true;
}

bool Line2D::_edit_is_selected_on_click(const Point2 &p_point, double p_tolerance) const {
	const real_t d = _width / 2 + p_tolerance;
	const Vector2 *points = _points.ptr();
	for (int i = 0; i < _points.size() - 1; i++) {
		Vector2 p = Geometry2D::get_closest_point_to_segment(p_point, &points[i]);
		if (p.distance_to(p_point) <= d) {
			return true;
		}
	}

	return false;
}
#endif

void Line2D::set_points(const Vector<Vector2> &p_points) {
	_points = p_points;
	update();
}

void Line2D::set_width(float p_width) {
	if (p_width < 0.0) {
		p_width = 0.0;
	}
	_width = p_width;
	update();
}

float Line2D::get_width() const {
	return _width;
}

void Line2D::set_curve(const Ref<Curve> &p_curve) {
	// Cleanup previous connection if any
	if (_curve.is_valid()) {
		_curve->disconnect(CoreStringNames::get_singleton()->changed, callable_mp(this, &Line2D::_curve_changed));
	}

	_curve = p_curve;

	// Connect to the curve so the line will update when it is changed
	if (_curve.is_valid()) {
		_curve->connect(CoreStringNames::get_singleton()->changed, callable_mp(this, &Line2D::_curve_changed));
	}

	update();
}

Ref<Curve> Line2D::get_curve() const {
	return _curve;
}

Vector<Vector2> Line2D::get_points() const {
	return _points;
}

void Line2D::set_point_position(int i, Vector2 p_pos) {
	ERR_FAIL_INDEX(i, _points.size());
	_points.set(i, p_pos);
	update();
}

Vector2 Line2D::get_point_position(int i) const {
	ERR_FAIL_INDEX_V(i, _points.size(), Vector2());
	return _points.get(i);
}

int Line2D::get_point_count() const {
	return _points.size();
}

void Line2D::clear_points() {
	int count = _points.size();
	if (count > 0) {
		_points.resize(0);
		update();
	}
}

void Line2D::add_point(Vector2 p_pos, int p_atpos) {
	if (p_atpos < 0 || _points.size() < p_atpos) {
		_points.push_back(p_pos);
	} else {
		_points.insert(p_atpos, p_pos);
	}
	update();
}

void Line2D::remove_point(int i) {
	_points.remove(i);
	update();
}

void Line2D::set_default_color(Color p_color) {
	_default_color = p_color;
	update();
}

Color Line2D::get_default_color() const {
	return _default_color;
}

void Line2D::set_gradient(const Ref<Gradient> &p_gradient) {
	// Cleanup previous connection if any
	if (_gradient.is_valid()) {
		_gradient->disconnect(CoreStringNames::get_singleton()->changed, callable_mp(this, &Line2D::_gradient_changed));
	}

	_gradient = p_gradient;

	// Connect to the gradient so the line will update when the Gradient is changed
	if (_gradient.is_valid()) {
		_gradient->connect(CoreStringNames::get_singleton()->changed, callable_mp(this, &Line2D::_gradient_changed));
	}

	update();
}

Ref<Gradient> Line2D::get_gradient() const {
	return _gradient;
}

void Line2D::set_texture(const Ref<Texture2D> &p_texture) {
	_texture = p_texture;
	update();
}

Ref<Texture2D> Line2D::get_texture() const {
	return _texture;
}

void Line2D::set_texture_mode(const LineTextureMode p_mode) {
	_texture_mode = p_mode;
	update();
}

Line2D::LineTextureMode Line2D::get_texture_mode() const {
	return _texture_mode;
}

void Line2D::set_joint_mode(LineJointMode p_mode) {
	_joint_mode = p_mode;
	update();
}

Line2D::LineJointMode Line2D::get_joint_mode() const {
	return _joint_mode;
}

void Line2D::set_begin_cap_mode(LineCapMode p_mode) {
	_begin_cap_mode = p_mode;
	update();
}

Line2D::LineCapMode Line2D::get_begin_cap_mode() const {
	return _begin_cap_mode;
}

void Line2D::set_end_cap_mode(LineCapMode p_mode) {
	_end_cap_mode = p_mode;
	update();
}

Line2D::LineCapMode Line2D::get_end_cap_mode() const {
	return _end_cap_mode;
}

void Line2D::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_DRAW:
			_draw();
			break;
	}
}

void Line2D::set_sharp_limit(float p_limit) {
	if (p_limit < 0.f) {
		p_limit = 0.f;
	}
	_sharp_limit = p_limit;
	update();
}

float Line2D::get_sharp_limit() const {
	return _sharp_limit;
}

void Line2D::set_round_precision(int p_precision) {
	if (p_precision < 1) {
		p_precision = 1;
	}
	_round_precision = p_precision;
	update();
}

int Line2D::get_round_precision() const {
	return _round_precision;
}

void Line2D::set_antialiased(bool p_antialiased) {
	_antialiased = p_antialiased;
	update();
}

bool Line2D::get_antialiased() const {
	return _antialiased;
}

void Line2D::_draw() {
	if (_points.size() <= 1 || _width == 0.f) {
		return;
	}

	// TODO Is this really needed?
	// Copy points for faster access
	Vector<Vector2> points;
	points.resize(_points.size());
	int len = points.size();
	{
		const Vector2 *points_read = _points.ptr();
		for (int i = 0; i < len; ++i) {
			points.write[i] = points_read[i];
		}
	}

	// TODO Maybe have it as member rather than copying parameters and allocating memory?
	LineBuilder lb;
	lb.points = points;
	lb.default_color = _default_color;
	lb.gradient = *_gradient;
	lb.texture_mode = _texture_mode;
	lb.joint_mode = _joint_mode;
	lb.begin_cap_mode = _begin_cap_mode;
	lb.end_cap_mode = _end_cap_mode;
	lb.round_precision = _round_precision;
	lb.sharp_limit = _sharp_limit;
	lb.width = _width;
	lb.curve = *_curve;

	RID texture_rid;
	if (_texture.is_valid()) {
		texture_rid = _texture->get_rid();

		lb.tile_aspect = _texture->get_size().aspect();
	}

	lb.build();

	RS::get_singleton()->canvas_item_add_triangle_array(
			get_canvas_item(),
			lb.indices,
			lb.vertices,
			lb.colors,
			lb.uvs, Vector<int>(), Vector<float>(),
			texture_rid);

	// DEBUG
	// Draw wireframe
	//	if(lb.indices.size() % 3 == 0) {
	//		Color col(0,0,0);
	//		for(int i = 0; i < lb.indices.size(); i += 3) {
	//			int vi = lb.indices[i];
	//			int lbvsize = lb.vertices.size();
	//			Vector2 a = lb.vertices[lb.indices[i]];
	//			Vector2 b = lb.vertices[lb.indices[i+1]];
	//			Vector2 c = lb.vertices[lb.indices[i+2]];
	//			draw_line(a, b, col);
	//			draw_line(b, c, col);
	//			draw_line(c, a, col);
	//		}
	//		for(int i = 0; i < lb.vertices.size(); ++i) {
	//			Vector2 p = lb.vertices[i];
	//			draw_rect(Rect2(p.x-1, p.y-1, 2, 2), Color(0,0,0,0.5));
	//		}
	//	}
}

void Line2D::_gradient_changed() {
	update();
}

void Line2D::_curve_changed() {
	update();
}

// static
void Line2D::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_points", "points"), &Line2D::set_points);
	ClassDB::bind_method(D_METHOD("get_points"), &Line2D::get_points);

	ClassDB::bind_method(D_METHOD("set_point_position", "i", "position"), &Line2D::set_point_position);
	ClassDB::bind_method(D_METHOD("get_point_position", "i"), &Line2D::get_point_position);

	ClassDB::bind_method(D_METHOD("get_point_count"), &Line2D::get_point_count);

	ClassDB::bind_method(D_METHOD("add_point", "position", "at_position"), &Line2D::add_point, DEFVAL(-1));
	ClassDB::bind_method(D_METHOD("remove_point", "i"), &Line2D::remove_point);

	ClassDB::bind_method(D_METHOD("clear_points"), &Line2D::clear_points);

	ClassDB::bind_method(D_METHOD("set_width", "width"), &Line2D::set_width);
	ClassDB::bind_method(D_METHOD("get_width"), &Line2D::get_width);

	ClassDB::bind_method(D_METHOD("set_curve", "curve"), &Line2D::set_curve);
	ClassDB::bind_method(D_METHOD("get_curve"), &Line2D::get_curve);

	ClassDB::bind_method(D_METHOD("set_default_color", "color"), &Line2D::set_default_color);
	ClassDB::bind_method(D_METHOD("get_default_color"), &Line2D::get_default_color);

	ClassDB::bind_method(D_METHOD("set_gradient", "color"), &Line2D::set_gradient);
	ClassDB::bind_method(D_METHOD("get_gradient"), &Line2D::get_gradient);

	ClassDB::bind_method(D_METHOD("set_texture", "texture"), &Line2D::set_texture);
	ClassDB::bind_method(D_METHOD("get_texture"), &Line2D::get_texture);

	ClassDB::bind_method(D_METHOD("set_texture_mode", "mode"), &Line2D::set_texture_mode);
	ClassDB::bind_method(D_METHOD("get_texture_mode"), &Line2D::get_texture_mode);

	ClassDB::bind_method(D_METHOD("set_joint_mode", "mode"), &Line2D::set_joint_mode);
	ClassDB::bind_method(D_METHOD("get_joint_mode"), &Line2D::get_joint_mode);

	ClassDB::bind_method(D_METHOD("set_begin_cap_mode", "mode"), &Line2D::set_begin_cap_mode);
	ClassDB::bind_method(D_METHOD("get_begin_cap_mode"), &Line2D::get_begin_cap_mode);

	ClassDB::bind_method(D_METHOD("set_end_cap_mode", "mode"), &Line2D::set_end_cap_mode);
	ClassDB::bind_method(D_METHOD("get_end_cap_mode"), &Line2D::get_end_cap_mode);

	ClassDB::bind_method(D_METHOD("set_sharp_limit", "limit"), &Line2D::set_sharp_limit);
	ClassDB::bind_method(D_METHOD("get_sharp_limit"), &Line2D::get_sharp_limit);

	ClassDB::bind_method(D_METHOD("set_round_precision", "precision"), &Line2D::set_round_precision);
	ClassDB::bind_method(D_METHOD("get_round_precision"), &Line2D::get_round_precision);

	ClassDB::bind_method(D_METHOD("set_antialiased", "antialiased"), &Line2D::set_antialiased);
	ClassDB::bind_method(D_METHOD("get_antialiased"), &Line2D::get_antialiased);

	ADD_PROPERTY(PropertyInfo(Variant::PACKED_VECTOR2_ARRAY, "points"), "set_points", "get_points");
	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "width"), "set_width", "get_width");
	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "width_curve", PROPERTY_HINT_RESOURCE_TYPE, "Curve"), "set_curve", "get_curve");
	ADD_PROPERTY(PropertyInfo(Variant::COLOR, "default_color"), "set_default_color", "get_default_color");
	ADD_GROUP("Fill", "");
	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "gradient", PROPERTY_HINT_RESOURCE_TYPE, "Gradient"), "set_gradient", "get_gradient");
	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "texture", PROPERTY_HINT_RESOURCE_TYPE, "Texture2D"), "set_texture", "get_texture");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "texture_mode", PROPERTY_HINT_ENUM, "None,Tile,Stretch"), "set_texture_mode", "get_texture_mode");
	ADD_GROUP("Capping", "");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "joint_mode", PROPERTY_HINT_ENUM, "Sharp,Bevel,Round"), "set_joint_mode", "get_joint_mode");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "begin_cap_mode", PROPERTY_HINT_ENUM, "None,Box,Round"), "set_begin_cap_mode", "get_begin_cap_mode");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "end_cap_mode", PROPERTY_HINT_ENUM, "None,Box,Round"), "set_end_cap_mode", "get_end_cap_mode");
	ADD_GROUP("Border", "");
	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "sharp_limit"), "set_sharp_limit", "get_sharp_limit");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "round_precision"), "set_round_precision", "get_round_precision");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "antialiased"), "set_antialiased", "get_antialiased");

	BIND_ENUM_CONSTANT(LINE_JOINT_SHARP);
	BIND_ENUM_CONSTANT(LINE_JOINT_BEVEL);
	BIND_ENUM_CONSTANT(LINE_JOINT_ROUND);

	BIND_ENUM_CONSTANT(LINE_CAP_NONE);
	BIND_ENUM_CONSTANT(LINE_CAP_BOX);
	BIND_ENUM_CONSTANT(LINE_CAP_ROUND);

	BIND_ENUM_CONSTANT(LINE_TEXTURE_NONE);
	BIND_ENUM_CONSTANT(LINE_TEXTURE_TILE);
	BIND_ENUM_CONSTANT(LINE_TEXTURE_STRETCH);
}