#!/usr/bin/env ruby

Maths = Math

$LOAD_PATH.unshift(File.join(File.dirname(__FILE__), 'lib'))
require 'interval'
require 'vec3'
require 'ray'
require 'hittable'
require 'camera'
require 'material'

#mat_ground = Lambertian.new(Colour.new(0.8, 0.8, 0.0))
#mat_centre = Lambertian.new(Colour.new(0.1, 0.2, 0.5))
#mat_left = Dielectric.new(1.5)
#mat_bubble = Dielectric.new(1 / 1.5)
#mat_right = Metal.new(Colour.new(0.8, 0.6, 0.2), 1.0)
#
#world = Hittables.new
#world << Sphere.new(Point.new( 0, -100.5,   -1), 100, mat_ground)
#world << Sphere.new(Point.new( 0,      0, -1.2), 0.5, mat_centre)
#world << Sphere.new(Point.new(-1,      0,   -1), 0.5, mat_left)
#world << Sphere.new(Point.new(-1,      0,   -1), 0.4, mat_bubble)
#world << Sphere.new(Point.new( 1,      0,   -1), 0.5, mat_right)
#
#camera = Camera.new(400, 16.0 / 9,
#                    vfov: 20,
#                    lookfrom: Point.new(-2,2,1),
#                    defocus_angle: 10, focus_dist: 3.4)
#camera.render(world)

world = Hittables.new

mat_ground = Lambertian.new(Colour.new(0.5, 0.5, 0.5))
world << Sphere.new(Point.new(0.0, -1000.0, 0.0), 1000.0, mat_ground)

(-4...4).each do |a|
  (-4...4).each do |b|
    centre = Point.new(a + 0.9 * rand, 0.2, b + 0.9 * rand)
    if (centre - Point.new(4, 0.2, 0)).mag > 0.9
      s_mat = case rand
      when 0...0.8
        albedo = Colour.random * Colour.random
        Lambertian.new(albedo)
      when 0.8...0.95
        albedo = Colour.random(min: 0.5, max: 1)
        fuzz = rand(0...0.5)
        Metal.new(albedo, fuzz)
      else
        Dielectric.new(1.5)
      end
      world << Sphere.new(centre, 0.2, s_mat)
    end
  end
end

mat1 = Dielectric.new(1.5)
world << Sphere.new(Point.new(0.0, 1.0, 0.0), 1.0, mat1)
mat2 = Lambertian.new(Colour.new(0.4, 0.2, 0.1))
world << Sphere.new(Point.new(-4.0, 1.0, 0.0), 1.0, mat2)
mat3 = Metal.new(Colour.new(0.7, 0.6, 0.5), 0.0)
world << Sphere.new(Point.new(4.0, 1.0, 0.0), 1.0, mat3)

camera = Camera.new(400, 16.0 / 9,
                    aliasing: 4, depth: 4,
                    vfov: 20.0,
                    lookfrom: Point.new(13.0, 2.0, 3.0),
                    lookat: Point.new,
                    defocus_angle: 0.6, focus_dist: 10.0)
camera.render(world)