# frozen_string_literal: true

require 'ruby2d'
require_relative 'camera'
require_relative 'animator'

@background = Image.new('assets/background.png')
@player =  Image.new('assets/player.png')
@squares = []

# Use this to add a few extra methods to an Image
module SizableImage
  def size
    width
  end

  def size=(size)
    self.height *= (size / width)
    self.width *= (size / width)
  end
end

@background.extend SizableImage
@player.extend SizableImage

# There is 2 ways you can add objects to be known and controlled by the camera, both do the same thing
Camera << @background
Camera.add @player

# This controls how slowly the camera will follow an object
# Set to 1 to not have any elasticity
# it is not used by the .move_to or .move_by
Camera.elasticity = 10

# If you want to use a camera, you need all elements in the world to be known to it
# Exeptions would be things such as UI elements where you want them statically placed on the screen
25.times do
  @squares << AnimatedSquare.new(x: (0..1920).to_a.sample,
                                 y: (0..1080).to_a.sample,
                                 size: (10..50).to_a.sample,
                                 color: 'random')
  Camera << @squares.last
end


# How fast the player can move
@speed = 10

# Initializing
@x_move = 0
@y_move = 0
@cam_x_move = 0
@cam_y_move = 0
@is_follow = true
@zoom_by = 1

on :key do |event|
  if event.key == 'a'
    @x_move -= @speed * Camera.zoom_level
  end
  if event.key == 'd'
    @x_move += @speed * Camera.zoom_level
  end
  if event.key == 'w'
    @y_move -= @speed * Camera.zoom_level
  end
  if event.key == 's'
    @y_move += @speed * Camera.zoom_level
  end
  if event.key == 'j'
    @cam_x_move -= @speed
    @is_follow = false
  end
  if event.key == 'l'
    @cam_x_move += @speed
    @is_follow = false
  end
  if event.key == 'i'
    @cam_y_move -= @speed
    @is_follow = false
  end
  if event.key == 'k'
    @cam_y_move += @speed
    @is_follow = false
  end
  if event.key == 'f'
    @is_follow = true
  end
end

on :key do |event|
  if event.key == 'q'
    @zoom_by = 1.1
  end
  if event.key == 'e'
    @zoom_by = 0.9
  end
  if event.key == 'r'
    Camera.zoom_to 1
  end
end

update do
  @player.x += @x_move
  @player.y += @y_move
  @x_move = 0
  @y_move = 0

  if @zoom_by != 1
    Camera.zoom_by @zoom_by
    @zoom_by = 1
  end
  # Need to use the cameras position as an offset to keep the shapes range of movement working
  # Need to make the zoom also give an offset
  @squares.each do |square|
    square.update(Camera.camera_position, Camera.zoom_level)
  end

  # Alternating between follow and manual control
  if @is_follow
    Camera.follow @player
  else
    Camera.move_by(@cam_x_move, @cam_y_move)
  end

  # This function will teleport the camera directory to those coordinates
  # It is used by Camera.follow but you can use it yourself too!
  #Camera.move_to(50,50)
  @cam_x_move = 0
  @cam_y_move = 0
end

show