const Vec2i = @This();

const Recti = @import("Recti.zig");
const Vec2f = @import("Vec2f.zig");
const Layer = @import("../Layer.zig");
const Color = @import("../Color.zig");
const shaders = @import("../shaders.zig");
const std = @import("std");
const c = @cImport({
	@cInclude("glad/glad.h");
	@cInclude("GLFW/glfw3.h");
});

x: i32,
y: i32,

pub fn create(x: i32, y: i32) Vec2i {
	return .{
		.x = x,
		.y = y,
	};
}

pub fn scale(self: *const Vec2i, s: i32) Vec2i {
	return .{
		.x = self.x * s,
		.y = self.y * s
	};
}

pub fn to_unit_recti(self: *const Vec2i) Recti {
	return Recti.from_xywh(self.x, self.y, 1, 1);
}

pub fn draw(self: *const Vec2i, radius: f32, layer: Layer, color: Color) void {
	shaders.disable_textures();

	const segments = 8;

	c.glBegin(c.GL_POLYGON);
	{
		for (0..segments) |segment| {
			const theta = (2.0 * std.math.pi * @as(f32, @floatFromInt(segment))) / segments;
			const x = radius * std.math.cos(theta);
			const y = radius * std.math.sin(theta);
			c.glVertexAttrib4f(shaders.COLOR_ATTRIBUTE_ID, color.r, color.g, color.b, color.a);
			c.glVertex3f(
				@as(f32, @floatFromInt(self.x)) + x,
				@as(f32, @floatFromInt(self.y)) + y,
				@as(f32, @floatFromInt(layer.z_index))
			);
		}
	}
	c.glEnd();
}

pub fn to_vec2f(self: *const Vec2i) Vec2f {
	return Vec2f {
		.x = @floatFromInt(self.x),
		.y = @floatFromInt(self.y),
	};
}


pub const ZERO = create(0, 0);
pub const ONE = create(1, 1);
pub const NORTH = create(0, -1);
pub const SOUTH = create(0, 1);
pub const EAST = create(1, 0);
pub const WEST = create(-1, 0);