class IMICFPS


  # A game object is any renderable thing
  class GameObject
    include OpenGL
    include GLU
    include CommonMethods
    attr_accessor :x, :y, :z, :scale
    attr_accessor :visible, :renderable, :backface_culling
    attr_accessor :x_rotation, :y_rotation, :z_rotation
    attr_reader :model, :name, :debug_color, :terrain, :width, :height, :depth
    def initialize(x: 0, y: 0, z: 0, bound_model: nil, scale: MODEL_METER_SCALE, backface_culling: true, auto_manage: true, terrain: nil)
      @x,@y,@z,@scale = x,y,z,scale
      @bound_model = bound_model
      @backface_culling = backface_culling
      @visible = true
      @renderable = true
      @x_rotation,@y_rotation,@z_rotation = 0,0,0
      @debug_color = Color.new(0.0, 1.0, 0.0)
      @terrain = terrain
      @width, @height, @depth = 0,0,0
      @delta_time = Gosu.milliseconds

      ObjectManager.add_object(self) if auto_manage
      setup

      if @bound_model
        @bound_model.model.game_object = self
        @bound_model.model.objects.each {|o| o.parent = self}

        box = normalize_bounding_box(@bound_model.model.bounding_box)
        @width  = box.max_x-box.min_x
        @height = box.max_y-box.min_y
        @depth  = box.max_z-box.min_z
      end

      return self
    end

    def bind_model(model)
      raise "model isn't a model!" unless model.is_a?(ModelLoader)
      @bound_model = model
      @bound_model.model.game_object = self
      @bound_model.model.objects.each {|o| o.parent = self}
      box = normalize_bounding_box(@bound_model.model.bounding_box)
      @width  = box.max_x-box.min_x
      @height = box.max_y-box.min_y
      @depth  = box.max_z-box.min_z
    end

    def model
      @bound_model.model if @bound_model
    end

    def unbind_model
      @bound_model = nil
    end

    def setup
    end

    def draw
      handleGlError

      glEnable(GL_NORMALIZE)
      glPushMatrix
      # Render bounding boxes before transformation is applied
      render_bounding_box(model.bounding_box) if $debug
      model.objects.each {|o| render_bounding_box(o.bounding_box, o.debug_color)} if $debug

      glTranslatef(@x, @y, @z)
      glRotatef(@x_rotation,1.0, 0, 0)
      glRotatef(@y_rotation,0, 1.0, 0)
      glRotatef(@z_rotation,0, 0, 1.0)

      handleGlError
      model.draw(@x, @y, @z, @scale, @backface_culling)
      handleGlError

      glPopMatrix
      handleGlError
    end

    def update
      model.update
      @delta_time = Gosu.milliseconds
    end

    # Do two Axis Aligned Bounding Boxes intersect?
    def intersect(a, b)
      a = a.normalize_bounding_box(a.model.bounding_box)
      b = b.normalize_bounding_box(b.model.bounding_box)

      puts "bounding boxes match!" if a == b
      if (((a.min_x <= b.min_x && b.max_x <= a.max_x) || (b.min_x <= a.min_x && a.min_x <= b.max_x)) &&
          ((a.min_y <= b.min_y && b.max_y <= a.max_y) || (b.min_y <= a.min_y && a.min_y <= b.max_y)) &&
          ((a.min_z <= b.min_z && b.max_z <= a.max_z) || (b.min_z <= a.min_z && a.min_z <= b.max_z)))
      # if (a.max_x >= b.max_x && a.min_x <= b.max_x) && (a.max_y >= b.min_y && a.min_y <= b.max_y)  && (a.max_z >= b.min_z && a.min_z <= b.max_z)
        return true
      else
        return false
      end
    end

    def normalize_bounding_box(box)
      temp = BoundingBox.new
      temp.min_x = box.min_x.to_f*scale+x
      temp.min_y = box.min_y.to_f*scale+y
      temp.min_z = box.min_z.to_f*scale+z

      temp.max_x = box.max_x.to_f*scale+x
      temp.max_y = box.max_y.to_f*scale+y
      temp.max_z = box.max_z.to_f*scale+z

      # puts "b: #{box}, Temp: #{temp}"
      return temp
    end

    def render_bounding_box(box, color = @debug_color)
      box = normalize_bounding_box(box)

      glEnableClientState(GL_VERTEX_ARRAY)
      glEnableClientState(GL_COLOR_ARRAY)
      glEnableClientState(GL_NORMAL_ARRAY)

      _normals = [
        0,1,0,
        0,1,0,
        0,1,0,
        0,1,0,
        0,1,0,
        0,1,0,

        0,-1,0,
        0,-1,0,
        0,-1,0,
        0,-1,0,
        0,-1,0,
        0,-1,0,

        0,0,1,
        0,0,1,
        0,0,1,
        0,0,1,
        0,0,1,
        0,0,1,

        1,0,0,
        1,0,0,
        1,0,0,
        1,0,0,
        1,0,0,
        1,0,0,

        -1,0,0,
        -1,0,0,
        -1,0,0,
        -1,0,0,
        -1,0,0,
        -1,0,0,

        -1,0,0,
        -1,0,0,
        -1,0,0,

        -1,0,0,
        -1,0,0,
        -1,0,0
      ].pack("f*")
      _colors  = [
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue,
        color.red, color.green, color.blue
      ].pack("f*")
      _vertices = [
        box.min_x, box.max_y, box.max_z,
        box.min_x, box.max_y, box.min_z,
        box.max_x, box.max_y, box.min_z,

        box.min_x, box.max_y, box.max_z,
        box.max_x, box.max_y, box.max_z,
        box.max_x, box.max_y, box.min_z,

        box.max_x, box.min_y, box.min_z,
        box.max_x, box.min_y, box.max_z,
        box.min_x, box.min_y, box.max_z,

        box.max_x, box.min_y, box.min_z,
        box.min_x, box.min_y, box.min_z,
        box.min_x, box.min_y, box.max_z,

        box.min_x, box.max_y, box.max_z,
        box.min_x, box.max_y, box.min_z,
        box.min_x, box.min_y, box.min_z,

        box.min_x, box.min_y, box.max_z,
        box.min_x, box.min_y, box.min_z,
        box.min_x, box.max_y, box.max_z,

        box.max_x, box.max_y, box.max_z,
        box.max_x, box.max_y, box.min_z,
        box.max_x, box.min_y, box.min_z,

        box.max_x, box.min_y, box.max_z,
        box.max_x, box.min_y, box.min_z,
        box.max_x, box.max_y, box.max_z,

        box.min_x, box.max_y, box.max_z,
        box.max_x, box.max_y, box.max_z,
        box.max_x, box.min_y, box.max_z,

        box.min_x, box.max_y, box.max_z,
        box.max_x, box.min_y, box.max_z,
        box.min_x, box.min_y, box.max_z,

        box.max_x, box.min_y, box.min_z,
        box.min_x, box.min_y, box.min_z,
        box.min_x, box.max_y, box.min_z,

        box.max_x, box.min_y, box.min_z,
        box.min_x, box.max_y, box.min_z,
        box.max_x, box.max_y, box.min_z
      ]
      _vertices_size = _vertices.size
      _vertices = _vertices.pack("f*")

      glVertexPointer(3, GL_FLOAT, 0, _vertices)
      glColorPointer(3, GL_FLOAT, 0, _colors)
      glNormalPointer(GL_FLOAT, 0, _normals)

      glPolygonMode(GL_FRONT_AND_BACK, GL_LINE)
      glDisable(GL_LIGHTING)
      glDrawArrays(GL_TRIANGLES, 0, _vertices_size/3)
      glEnable(GL_LIGHTING)
      glPolygonMode(GL_FRONT_AND_BACK, GL_FILL)

      glDisableClientState(GL_VERTEX_ARRAY)
      glDisableClientState(GL_COLOR_ARRAY)
      glDisableClientState(GL_NORMAL_ARRAY)
    end

    def handleGlError
      e = glGetError()
      if e != GL_NO_ERROR
        $stderr.puts "OpenGL error in: #{gluErrorString(e)} (#{e})\n"
        exit
      end
    end
  end
end